Arquivo da categoria: Uncategorized

Amputees discern familiar sensations across prosthetic hand (Science Daily)

Date: October 8, 2014

Source: Case Western Reserve University

Summary: Patients connected to a new prosthetic system said they ‘felt’ their hands for the first time since they lost them in accidents. In the ensuing months, they began feeling sensations that were familiar and were able to control their prosthetic hands with more — well — dexterity.

Medical researchers are helping restore the sense of touch in amputees. Credit: Image courtesy of Case Western Reserve University

Even before he lost his right hand to an industrial accident 4 years ago, Igor Spetic had family open his medicine bottles. Cotton balls give him goose bumps.

Now, blindfolded during an experiment, he feels his arm hairs rise when a researcher brushes the back of his prosthetic hand with a cotton ball.

Spetic, of course, can’t feel the ball. But patterns of electric signals are sent by a computer into nerves in his arm and to his brain, which tells him different. “I knew immediately it was cotton,” he said.

That’s one of several types of sensation Spetic, of Madison, Ohio, can feel with the prosthetic system being developed by Case Western Reserve University and the Louis Stokes Cleveland Veterans Affairs Medical Center.

Spetic was excited just to “feel” again, and quickly received an unexpected benefit. The phantom pain he’d suffered, which he’s described as a vice crushing his closed fist, subsided almost completely. A second patient, who had less phantom pain after losing his right hand and much of his forearm in an accident, said his, too, is nearly gone.

Despite having phantom pain, both men said that the first time they were connected to the system and received the electrical stimulation, was the first time they’d felt their hands since their accidents. In the ensuing months, they began feeling sensations that were familiar and were able to control their prosthetic hands with more — well — dexterity.

To watch a video of the research, click here: http://youtu.be/l7jht5vvzR4.

“The sense of touch is one of the ways we interact with objects around us,” said Dustin Tyler, an associate professor of biomedical engineering at Case Western Reserve and director of the research. “Our goal is not just to restore function, but to build a reconnection to the world. This is long-lasting, chronic restoration of sensation over multiple points across the hand.”

“The work reactivates areas of the brain that produce the sense of touch, said Tyler, who is also associate director of the Advanced Platform Technology Center at the Cleveland VA. “When the hand is lost, the inputs that switched on these areas were lost.”

How the system works and the results will be published online in the journal Science Translational Medicine Oct. 8.

“The sense of touch actually gets better,” said Keith Vonderhuevel, of Sidney, Ohio, who lost his hand in 2005 and had the system implanted in January 2013. “They change things on the computer to change the sensation.

“One time,” he said, “it felt like water running across the back of my hand.”

The system, which is limited to the lab at this point, uses electrical stimulation to give the sense of feeling. But there are key differences from other reported efforts.

First, the nerves that used to relay the sense of touch to the brain are stimulated by contact points on cuffs that encircle major nerve bundles in the arm, not by electrodes inserted through the protective nerve membranes.

Surgeons Michael W Keith, MD and J. Robert Anderson, MD, from Case Western Reserve School of Medicine and Cleveland VA, implanted three electrode cuffs in Spetic’s forearm, enabling him to feel 19 distinct points; and two cuffs in Vonderhuevel’s upper arm, enabling him to feel 16 distinct locations.

Second, when they began the study, the sensation Spetic felt when a sensor was touched was a tingle. To provide more natural sensations, the research team has developed algorithms that convert the input from sensors taped to a patient’s hand into varying patterns and intensities of electrical signals. The sensors themselves aren’t sophisticated enough to discern textures, they detect only pressure.

The different signal patterns, passed through the cuffs, are read as different stimuli by the brain. The scientists continue to fine-tune the patterns, and Spetic and Vonderhuevel appear to be becoming more attuned to them.

Third, the system has worked for 2 ½ years in Spetic and 1½ in Vonderhueval. Other research has reported sensation lasting one month and, in some cases, the ability to feel began to fade over weeks.

A blindfolded Vonderhuevel has held grapes or cherries in his prosthetic hand — the signals enabling him to gauge how tightly he’s squeezing — and pulled out the stems.

“When the sensation’s on, it’s not too hard,” he said. “When it’s off, you make a lot of grape juice.”

Different signal patterns interpreted as sandpaper, a smooth surface and a ridged surface enabled a blindfolded Spetic to discern each as they were applied to his hand. And when researchers touched two different locations with two different textures at the same time, he could discern the type and location of each.

Tyler believes that everyone creates a map of sensations from their life history that enables them to correlate an input to a given sensation.

“I don’t presume the stimuli we’re giving is hitting the spots on the map exactly, but they’re familiar enough that the brain identifies what it is,” he said.

Because of Vonderheuval’s and Spetic’s continuing progress, Tyler is hopeful the method can lead to a lifetime of use. He’s optimistic his team can develop a system a patient could use at home, within five years.

In addition to hand prosthetics, Tyler believes the technology can be used to help those using prosthetic legs receive input from the ground and adjust to gravel or uneven surfaces. Beyond that, the neural interfacing and new stimulation techniques may be useful in controlling tremors, deep brain stimulation and more.


Journal Reference:

  1. D. W. Tan, M. A. Schiefer, M. W. Keith, J. R. Anderson, J. Tyler, D. J. Tyler. A neural interface provides long-term stable natural touch perception. Science Translational Medicine, 2014; 6 (257): 257ra138 DOI:10.1126/scitranslmed.3008669

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Mind-controlled prosthetic arms that work in daily life are now a reality (Science Daily)

Date: October 8, 2014

Source: Chalmers University of Technology

Summary: For the first time, robotic prostheses controlled via implanted neuromuscular interfaces have become a clinical reality. A novel osseointegrated (bone-anchored) implant system gives patients new opportunities in their daily life and professional activities.


For the first time, robotic prostheses controlled via implanted neuromuscular interfaces have become a clinical reality. Credit: Image courtesy of Chalmers University of Technology

For the first time, robotic prostheses controlled via implanted neuromuscular interfaces have become a clinical reality. A novel osseointegrated (bone-anchored) implant system gives patients new opportunities in their daily life and professional activities.

In January 2013 a Swedish arm amputee was the first person in the world to receive a prosthesis with a direct connection to bone, nerves and muscles. An article about this achievement and its long-term stability will now be published in the Science Translational Medicine journal.

“Going beyond the lab to allow the patient to face real-world challenges is the main contribution of this work,” says Max Ortiz Catalan, research scientist at Chalmers University of Technology and leading author of the publication.

“We have used osseointegration to create a long-term stable fusion between man and machine, where we have integrated them at different levels. The artificial arm is directly attached to the skeleton, thus providing mechanical stability. Then the human’s biological control system, that is nerves and muscles, is also interfaced to the machine’s control system via neuromuscular electrodes. This creates an intimate union between the body and the machine; between biology and mechatronics.”

The direct skeletal attachment is created by what is known as osseointegration, a technology in limb prostheses pioneered by associate professor Rickard Brånemark and his colleagues at Sahlgrenska University Hospital. Rickard Brånemark led the surgical implantation and collaborated closely with Max Ortiz Catalan and Professor Bo Håkansson at Chalmers University of Technology on this project.

The patient’s arm was amputated over ten years ago. Before the surgery, his prosthesis was controlled via electrodes placed over the skin. Robotic prostheses can be very advanced, but such a control system makes them unreliable and limits their functionality, and patients commonly reject them as a result.

Now, the patient has been given a control system that is directly connected to his own. He has a physically challenging job as a truck driver in northern Sweden, and since the surgery he has experienced that he can cope with all the situations he faces; everything from clamping his trailer load and operating machinery, to unpacking eggs and tying his children’s skates, regardless of the environmental conditions (read more about the benefits of the new technology below).

The patient is also one of the first in the world to take part in an effort to achieve long-term sensation via the prosthesis. Because the implant is a bidirectional interface, it can also be used to send signals in the opposite direction — from the prosthetic arm to the brain. This is the researchers’ next step, to clinically implement their findings on sensory feedback.

“Reliable communication between the prosthesis and the body has been the missing link for the clinical implementation of neural control and sensory feedback, and this is now in place,” says Max Ortiz Catalan. “So far we have shown that the patient has a long-term stable ability to perceive touch in different locations in the missing hand. Intuitive sensory feedback and control are crucial for interacting with the environment, for example to reliably hold an object despite disturbances or uncertainty. Today, no patient walks around with a prosthesis that provides such information, but we are working towards changing that in the very short term.”

The researchers plan to treat more patients with the novel technology later this year.

“We see this technology as an important step towards more natural control of artificial limbs,” says Max Ortiz Catalan. “It is the missing link for allowing sophisticated neural interfaces to control sophisticated prostheses. So far, this has only been possible in short experiments within controlled environments.”

More about: How the technology works

The new technology is based on the OPRA treatment (osseointegrated prosthesis for the rehabilitation of amputees), where a titanium implant is surgically inserted into the bone and becomes fixated to it by a process known as osseointegration (Osseo = bone). A percutaneous component (abutment) is then attached to the titanium implant to serve as a metallic bone extension, where the prosthesis is then fixated. Electrodes are implanted in nerves and muscles as the interfaces to the biological control system. These electrodes record signals which are transmitted via the osseointegrated implant to the prostheses, where the signals are finally decoded and translated into motions.

More about: Benefits of the new technology, compared to socket prostheses

Direct skeletal attachment by osseointegration means:

  • Increased range of motion since there are no physical limitations by the socket — the patient can move the remaining joints freely
  • Elimination of sores and pain caused by the constant pressure from the socket
  • Stable and easy attachment/detachment
  • Increased sensory feedback due to the direct transmission of forces and vibrations to the bone (osseoperception)
  • The prosthesis can be worn all day, every day
  • No socket adjustments required (there is no socket)

Implanting electrodes in nerves and muscles means that:

  • Due to the intimate connection, the patients can control the prosthesis with less effort and more precisely, and can thus handle smaller and more delicate items.
  • The close proximity between source and electrode also prevents activity from other muscles from interfering (cross-talk), so that the patient can move the arm to any position and still maintain control of the prosthesis.
  • More motor signals can be obtained from muscles and nerves, so that more movements can be intuitively controlled in the prosthesis.
  • After the first fitting of the controller, little or no recalibration is required because there is no need to reposition the electrodes on every occasion the prosthesis is worn (as opposed to superficial electrodes).
  • Since the electrodes are implanted rather than placed over the skin, control is not affected by environmental conditions (cold and heat) that change the skin state, or by limb motions that displace the skin over the muscles. The control is also resilient to electromagnetic interference (noise from other electric devices or power lines) as the electrodes are shielded by the body itself.
  • Electrodes in the nerves can be used to send signals to the brain as sensations coming from the prostheses.

Journal Reference:

  1. M. Ortiz-Catalan, B. Hakansson, R. Branemark. An osseointegrated human-machine gateway for long-term sensory feedback and motor control of artificial limbs. Science Translational Medicine, 2014; 6 (257): 257re6 DOI:10.1126/scitranslmed.3008933

‘El rayo fue un castigo’: Mamo que sobrevivió a tragedia de la Sierra (El Tiempo)

EL TIEMPO visitó el pueblo donde murieron 11 indígenas y habló con su máxima autoridad.

Por:   |

2:29 p.m. | 7 de octubre de 2014

En la foto, el mamo Ramón Gil, que perdió a su hijo Juan Ramón Gil cuando cayó el rayo que mató a 11 indígenas.

Foto: Carlos Capella / EL TIEMPO. En la foto, el mamo Ramón Gil, que perdió a su hijo Juan Ramón Gil cuando cayó el rayo que mató a 11 indígenas.

El mamo Ramón Gil, la máxima autoridad de los wiwa y uno de los indígenas tradicionales más conocidos de la Sierra Nevada, dice que hace dos años la naturaleza le había advertido que debían pagar por tantas talas y saqueos que se han realizado en estas montañas. (Lea también: Llegan ayudas a comunidad wiwa tras caída de rayo en Sierra Nevada)

Esa advertencia se hizo realidad cuando en la madrugada de este lunes, asegura el mamo, un rayo cayó sobre la unguma, choza ceremonial donde estaban reunidos unos 50 wiwas de la cuenca media del río Guachaca, y mató a 11 indígenas y dejó a otros 20 con heridas.

La comunidad wiwa de la sierra nevada de Santa Marta se repone de la tragedia que ocasionó la caída de un rayo que mató 11 personas y dejó 20 heridos. Foto: CEET

Luego de la tragedia, en la noche del lunes, los indígenas se fueron del pueblo por temor a que otro rayo volviera a castigarlos. Los cadáveres fueron recogidos en una choza y acomodados en el piso, donde pasaron la noche. Hoy, en la mañana, cuando escucharon el sonido del helicóptero volvieron a bajar de las montañas al pueblo. (Lea también: ‘Un trueno retumbó en la Sierra y en segundos se prendió la choza’)

“El domingo a las seis de la tarde, cuando cayeron los primeros relámpagos, sentí que estaban molestos, pidiendo que le devuelvan a la naturaleza todo lo que se han llevado de la Sierra”, contó el hombre ayer entre las cenizas de la choza ceremonial, de donde aún, pese a los últimos aguaceros, se levantan pequeñas columnas de humo que salen de la tierra y el olor a quemado invade las 40 chozas de kemakúmake, el pueblo ancestral que llora por la tragedia. (Vea las fotos de la zona donde cayó el rayo y la operación para evacuar a los heridos)

En su relato, Ramón, que perdió a su hijo, recuerda que le dijo a la comunidad que el relámpago necesitaba un pago, por tantos árboles talados y cuarzo saqueado. También les había dicho que desde hace tiempo la naturaleza le estaba pidiendo que le cobrara a todos aquellos que habían profanado esos lugares sagrados y él no lo había hecho. (Vea en un mapa los 2.900 rayos que cayeron en la zona de la Sierra Nevada)

“Le dije a la comunidad, el trueno está bravo, dice que nos mandó el primer castigo el verano, pero como suplicamos mucho, manda el aguacero, pero no pagamos y ahora va a venir guerra de la naturaleza y de la humanidad”, asegura el viejo mamo que le dijo la naturaleza.

Esa noche, él estaba hablando con los hombres del pueblo en la choza ceremonial, cuando sintió como la luz iluminó el lugar y todos fueron cayendo lentamente. “Cuando la candela vino hacia mí se me nubló la vista. Me levanté, me dio rabia y lo insulté. A los pocos minutos solo hubo caos y el fuego se apoderó del lugar”, recuerda . Los indígenas que llegaron de las otras chozas tuvieron que sacar los cuerpos para evitar que las llamas los consumieran. (Lea también: Unas 100 personas mueren por rayos en Colombia cada año)

“Le quitamos 11 para que reflexione, analice y hable con los hermanitos menores y les advierta también”, dice Ramón que es el mensaje de la naturaleza.

Pide reunión con mamos

El mamo Ramón le pidió al Gobierno que los ayude para citar un encuentro de por lo menos un mes con los mamos ancestrales y espirituales de los cuatro pueblos indígenas de la Sierra Nevada: koguis, arhuacos, kankuamos y wiwas, para que analicen como autoridades todas las problemáticas que se viven en estos momentos en los resguardos.

Luego de la tragedia, en la noche del lunes, los indígenas se fueron del pueblo por temor a que otro rayo volviera a castigarlos. Foto CEET

También reconoció que los cabildos gobernadores de estos pueblos se han convertido en una especie de talanquera para que las autoridades espirituales y guías de estos pueblos se reúnan. “Necesitamos analizar y unificar un criterio, interna y espiritualmente, ya que los cabildos gobernadores no se ponen de acuerdo”, dijo.

Ayer, Ramón se lamentó de no saber leer ni escribir en español para poder hacer una cartilla para que todos entiendan y comprendan cuál es el mensaje que la naturaleza les da a los mamos y así respeten los últimos recursos que quedan en la Sierra Nevada.

Siguen llegando ayudas

A las 6:30 a.m. de hoy salió el primer helicóptero con alimentos, frazadas, medicamentos y hamacas recogidos por la Defensa Civil y enviados por la Unidad Nacional de Riesgo.

Desde la primera División del Ejército, entre ayer hoy, unos nueve viajes se hicieron en helicópteros sacando heridos, llevando ayudas y periodistas. “No solamente estamos para la guerra, también para ayudas humanitarias”, dijo el capitán del Ejército, Ómar Pardo, quien está al frente de los vuelos.

Ejército y Policía acompañados de la Defensa Civil llevan ayudas. Foto: CEET

A su turno, el coronel Luis Alfonso Quintero Parada, comandante de la Policía Metropolitana de Santa Marta, encabezó con la Policía Judicial la última inspección a los cadáveres, que hoy mismo serán entregados a la comunidad.

“Tenemos un equipo medico revisando a los indígenas, tal como lo solicitaron, para brindarles un apoyo con medicamento y curación, al equipo de Policía judicial se les sumaron dos médicos forenses de Barranquilla, para apoyar el trabajo”, dijo el oficial.

L​eonardo Herrera Delghams
Enviado especial de EL TIEMPO
Sierra Nevada de Santa Marta

Plantio de florestas é estratégia de enfrentamento do aquecimento global (Fapesp)

08 de outubro de 2014

Por Karina Toledo

Agência FAPESP – Em um artigo publicado na seção de opinião do jornal norte-americano The New York Times, em 19 de setembro, Nadine Unger, professora da Yale University, afirmou serem fracas as evidências científicas sobre os benefícios proporcionados pelo reflorestamento e pela redução do desmatamento na mitigação das mudanças climáticas.

O texto causou forte reação na comunidade científica. No dia 22 de setembro, um grupo formado por 31 pesquisadores – vários deles membros do Painel Intergovernamental de Mudanças Climáticas (IPCC) da Organização das Nações Unidas (ONU) – divulgou uma carta aberta na qual discordam veementemente das declarações feitas por Unger.

Uma versão resumida do texto foi publicada na seção de opinião do The New York Times no dia 23 de setembro, mesma data em que começou em Nova York a Cúpula da Organização das Nações Unidas (ONU) sobre o Clima.

Na carta resposta, o grupo de cientistas contesta a afirmação de Unger, de que estaria incorreta a “sabedoria convencional” segundo a qual o plantio de árvores auxilia no combate ao aquecimento global. Na avaliação dela, a medida poderia até mesmo agravar o problema climático.

De acordo com os cientistas, as florestas promovem um efeito de resfriamento do clima porque armazenam vastas quantidades de carbono em troncos, galhos, folhas e são capazes de manter esse elemento químico fora da atmosfera enquanto permanecerem intactas e saudáveis.

Segundo o grupo, as florestas também resfriam a atmosfera porque convertem a energia solar em vapor d’água, o que aumenta a refletividade da radiação solar por meio da formação de nuvens, fato negligenciado no trabalho de Unger. Concordam, em parte, com a afirmação da professora de Química Atmosférica em Yale, de que “as cores escuras das árvores absorvem maior quantidade de energia solar e aumentam a temperatura da superfície terrestre”.

Unger afirmou que plantar árvores nos trópicos poderia promover o resfriamento, mas em regiões mais frias causaria aquecimento.

“Ela (Unger) aponta corretamente que florestas refletem menos energia solar do que a neve, as pedras, as pastagens ou o solo, mas ignora o efeito das florestas de aumentar a refletividade do céu acima da terra, por meio das nuvens. Esse efeito é maior nos trópicos”, afirmaram os cientistas.

Unger disse não haver consenso científico em relação aos impactos da mudança de uso da terra promovida pela expansão da agricultura e se o desmatamento resultante teria contribuído para esfriar ou aquecer o planeta.

“Não podemos prever com certeza que o reflorestamento em larga escala ajudaria a controlar as temperaturas em elevação”, disse ela. Argumentos semelhantes já haviam sido apresentados pela cientista em artigo publicado em agosto na Nature Climate Change.

Ainda segundo Unger, os compostos orgânicos voláteis (VOCs, na sigla em inglês) emitidos pelas árvores em resposta a estressores ambientais interagem com poluentes oriundos da queima de combustíveis fósseis aumentando a produção de gases-estufa como metano e ozônio.

Por último, a cientista de Yale afirmou que o carbono sequestrado pelas árvores durante seu crescimento retorna à atmosfera quando elas morrem e que o oxigênio produzido durante a fotossíntese é consumido pela vegetação durante a respiração noturna. “A Amazônia é um sistema fechado que consome seu próprio carbono e oxigênio”, argumentou.

Benefícios indiscutíveis

A carta resposta divulgada pelos cientistas ressalta que os próprios estudos de Unger mostraram que qualquer potencial efeito de resfriamento promovido pela redução das emissões de compostos orgânicos voláteis resultante do corte de árvores seria superado pelo efeito de aquecimento promovido pelas emissões de carbono causadas pelo desmatamento.

“Esta semana, as negociações das Nações Unidas sobre o clima abordam a importância de dar continuidade aos esforços para frear a degradação das florestas tropicais, que são uma contribuição essencial e barata para a mitigação das mudanças climáticas. A base científica para essa importante peça da solução do problema climático é sólida. Nós discordamos fortemente da mensagem central da professora Unger. Concordamos, no entanto, com a afirmação feita por ela de que as florestas oferecem benefícios indiscutíveis para a biodiversidade”, concluem os cientistas.

O grupo de autores é liderado por Daniel Nepstad, diretor executivo do Earth Innovation Institute, dos Estados Unidos, um dos fundadores do Instituto de Pesquisa Ambiental da Amazônia (Ipam) e um dos autores do quinto relatório divulgado pelo IPCC.

Também fazem parte do grupo Reynaldo Victoria, professor da Universidade de São Paulo (USP) e membro da coordenação do Programa FAPESP de Pesquisa sobre Mudanças Climáticas Globais, e Paulo Artaxo, professor da USP e um dos autores do quinto relatório do IPCC.

“O artigo divulgado por Unger na revista Nature Climate Change tem erros elementares e não leva em conta aspectos fundamentais, como a importância das florestas tropicais na formação de nuvens, que altera a refletividade da superfície e também atua no controle do ciclo hidrológico”, disse Artaxo à Agência FAPESP.

“Esse episódio mostra como a ciência, quando negligencia aspectos importantes, pode ser muito prejudicial do ponto de vista de políticas públicas. Reflorestamento e redução do desmatamento são umas das melhores estratégias de redução dos efeitos do aquecimento global”, afirmou.

Killer whales learn to communicate like dolphins (Science Daily)

Date: October 7, 2014

Source: Acoustical Society of America (ASA)

Summary: The sounds that most animals use to communicate are innate, not learned. However, a few species, including humans, can imitate new sounds and use them in appropriate social contexts. This ability, known as vocal learning, is one of the underpinnings of language. Now, researchers have found that killer whales can engage in cross-species vocal learning: when socialized with bottlenose dolphins, they shifted the sounds they made to more closely match their social partners.

Killer whales (Orcinus orca) can engage in cross-species vocal learning: when socialized with bottlenose dolphins, they shifted the types of sounds they made to more closely match their social partners. Credit: © RKP / Fotolia

From barks to gobbles, the sounds that most animals use to communicate are innate, not learned. However, a few species, including humans, can imitate new sounds and use them in appropriate social contexts. This ability, known as vocal learning, is one of the underpinnings of language.

Vocal learning has also been observed in bats, some birds, and cetaceans, a group that includes whales and dolphins. But while avian researchers have characterized vocal learning in songbirds down to specific neural pathways, studying the trait in large marine animals has presented more of a challenge.

Now, University of San Diego graduate student Whitney Musser and Hubbs-SeaWorld Research Institute senior research scientist Dr. Ann Bowles have found that killer whales (Orcinus orca) can engage in cross-species vocal learning: when socialized with bottlenose dolphins, they shifted the types of sounds they made to more closely match their social partners. The results, published in The Journal of the Acoustical Society of America, suggest that vocal imitation may facilitate social interactions in cetaceans.

Killer whales have complex vocal repertoires made up of clicks, whistles and pulsed calls — repeated brief bursts of sound punctuated with silence. The acoustic features of these vocalizations, such as their duration, pitch and pulse pattern, vary across social groups. Whales that are closely related or live together produce similar pulsed calls that carry vocal characteristics distinct to the group, known as a dialect.

“There’s been an idea for a long time that killer whales learn their dialect, but it isn’t enough to say they all have different dialects so therefore they learn. There needs to be some experimental proof so you can say how well they learn and what context promotes learning,” said Bowles.

Testing vocal learning ability in social mammals usually requires observing the animal in a novel social situation, one that might stimulate them to communicate in new ways. Bottlenose dolphins provide a useful comparison species in this respect: they make generally similar sounds but produce them in different proportions, relying more on clicks and whistles than the pulsed calls that dominate killer whale communication.

“We had a perfect opportunity because historically, some killer whales have been held with bottlenose dolphins,” said Bowles. By comparing old recordings of vocalization patterns from the cross-socialized subjects with recordings of killer whales and bottlenose dolphins housed in same-species groups, Bowles and her team were able to evaluate the degree to which killer whales learned vocalization patterns from their cross-species social partners.

All three killer whales that had been housed with dolphins for several years shifted the proportions of different call types in their repertoire to more closely match the distribution found in dolphins — they produced more clicks and whistles and fewer pulsed calls. The researchers also found evidence that killer whales can learn completely new sounds: one killer whale that was living with dolphins at the time of the experiment learned to produce a chirp sequence that human caretakers had taught to her dolphin pool-mates before she was introduced to them.

Vocal learning skills alone don’t necessarily mean that killer whales have language in the same way that humans do. However, they do indicate a high level of neural plasticity, the ability to change circuits in the brain to incorporate new information. “Killer whales seem to be really motivated to match the features of their social partners,” said Bowles, though the adaptive significance of the behavior is not yet known.

There are immediate reasons to study the vocal patterns of cetaceans: these marine mammals are threatened by human activities through competition for fishery resources, entanglement in fishing gear, collisions with vessels, exposure to pollutants and oil spills and, ultimately, shrinking habitats due to anthropogenic climate change. If their social bonds are closely linked to their vocalizations, killer whales’ ability to survive amidst shifting territories and social groups may be tied to their ability to adapt their communication strategies.

“It’s important to understand how they acquire [their vocalization patterns], and lifelong, to what degree they can change it, because there are a number of different [cetacean] populations on the decline right now,” said Bowles. “And where killer whales go, we can expect other small whale species to go — it’s a broader question.”


Journal Reference:

  1. Whitney B. Musser, Ann E. Bowles, Dawn M. Grebner, and Jessica L. Crance.Differences in acoustic features of vocalizations produced by killer whales cross-socialized with bottlenose dolphins. The Journal of the Acoustical Society of America, 2014 DOI: 10.1121/1.4893906

Consciência pode permanecer por até três minutos após a morte, diz estudo (O Globo)

Cientistas entrevistaram pacientes que chegaram a ter morte clínica, mas voltaram à vida

POR O GLOBO

Cena da novela "Amor Eterno Amor" da Rede Globo retrata a experiência de quase morte estudadas pelos cientistas da Universidade de Southampton Foto: ReproduçãoCena da novela “Amor Eterno Amor” da Rede Globo retrata a experiência de quase morte estudadas pelos cientistas da Universidade de Southampton – Reprodução

RIO – Aquele túnel com uma luz brilhante no fundo e uma sensação de paz descritos por filmes e outras pessoas que alegaram ter passado por experiência de quase morte podem ser reais. No maior estudo já feito sobre o tema, cientistas da Universidade de Southampton disseram ter comprovado que a consciência humana permanece por ao menos três minutos após o óbito biológico. Durante esse meio tempo, pacientes conseguiriam testemunhar e lembrar depois de eventos como a saída do corpo e os movimentos ao redor do quarto do hospital.

Ao longo de quatro anos, os especialistas examinaram mais de duas mil pessoas que sofreram paradas cardíacas em 15 hospitais no Reino Unido, Estados Unidos e Áustria. Cerca de 16% sobreviveram. E destes, mais de 40% descreveram algum tipo de “consciência” durante o tempo em que eles estavam clinicamente mortos, antes de seus corações voltarem a bater.

O caso mais emblemático foi de um homem ainda lembrou ter deixado seu corpo totalmente e assistindo sua reanimação do canto da sala. Apesar de ser inconsciente e “morto” por três minutos, o paciente narrou com detalhes as ações da equipe de enfermagem e descreveu o som das máquinas.

– Sabemos que o cérebro não pode funcionar quando o coração parou de bater. Mas neste caso, a percepção consciente parece ter continuado por até três minutos no período em que o coração não estava batendo, mesmo que o cérebro normalmente encerre as atividades dentro de 20 a 30 segundos após o coração – explicou ao jornal inglês The Telegraph o pesquisador Sam Parnia.

Dos 2.060 pacientes com parada cardíaca estudados, 330 sobreviveram e 140 disseram ter experimentado algum tipo de consciência ao ser ressuscitado. Embora muitos não se lembrassem de detalhes específicos, alguns relatos coincidiram. Um em cada cinco disseram que tinha sentido uma sensação incomum de tranquilidade, enquanto quase um terço disse que o tempo tinha se abrandado ou se acelerado.

Alguns lembraram de ter visto uma luz brilhante, um flash de ouro ou o sol brilhando. Outros relataram sentimentos de medo, afogamento ou sendo arrastado pelas águas profundas. Cerca de 13% disseram que se sentiam separados de seus corpos.

De acordo com Parnia, muito mais pessoas podem ter experiências quando estão perto da morte, mas as drogas ou sedativos utilizados no processo de ressuscitação podem afetar a memória:

– As estimativas sugerem que milhões de pessoas tiveram experiências vivas em relação à morte. Muitas assumiram que eram alucinações ou ilusões, mas os relatos parecem corresponder a eventos reais. E uma proporção maior de pessoas pode ter experiências vivas de morte, mas não se lembrarem delas devido aos efeitos da lesão cerebral ou sedativos em circuitos de memória.

VEJA TAMBÉM

Read more: http://oglobo.globo.com/sociedade/saude/consciencia-pode-permanecer-por-ate-tres-minutos-apos-morte-diz-estudo-14166762#ixzz3FaJap9ny

Near-death experiences? Results of the world’s largest medical study of the human mind and consciousness at time of death (Science Daily)

Date: October 7, 2014

Source: University of Southampton

Summary: The results of a four-year international study of 2060 cardiac arrest cases across 15 hospitals concludes the following. The themes relating to the experience of death appear far broader than what has been understood so far, or what has been described as so called near-death experiences. In some cases of cardiac arrest, memories of visual awareness compatible with so called out-of-body experiences may correspond with actual events. A higher proportion of people may have vivid death experiences, but do not recall them due to the effects of brain injury or sedative drugs on memory circuits. Widely used yet scientifically imprecise terms such as near-death and out-of-body experiences may not be sufficient to describe the actual experience of death. The recalled experience surrounding death merits a genuine investigation without prejudice.

The results of a four-year international study of 2060 cardiac arrest cases across 15 hospitals are in. Among those who reported a perception of awareness and completed further interviews, 46 per cent experienced a broad range of mental recollections in relation to death that were not compatible with the commonly used term of near death experiences. Credit: © sudok1 / Fotolia

The results of a four-year international study of 2060 cardiac arrest cases across 15 hospitals concludes the following. The themes relating to the experience of death appear far broader than what has been understood so far, or what has been described as so called near-death experiences. In some cases of cardiac arrest, memories of visual awareness compatible with so called out-of-body experiences may correspond with actual events. A higher proportion of people may have vivid death experiences, but do not recall them due to the effects of brain injury or sedative drugs on memory circuits. Widely used yet scientifically imprecise terms such as near-death and out-of-body experiences may not be sufficient to describe the actual experience of death.

Recollections in relation to death, so-called out-of-body experiences (OBEs) or near-death experiences (NDEs), are an often spoken about phenomenon which have frequently been considered hallucinatory or illusory in nature; however, objective studies on these experiences are limited.

In 2008, a large-scale study involving 2060 patients from 15 hospitals in the United Kingdom, United States and Austria was launched. The AWARE (AWAreness during REsuscitation) study, sponsored by the University of Southampton in the UK, examined the broad range of mental experiences in relation to death. Researchers also tested the validity of conscious experiences using objective markers for the first time in a large study to determine whether claims of awareness compatible with out-of-body experiences correspond with real or hallucinatory events.

Results of the study have been published in the journal Resuscitation.

Dr Sam Parnia, Assistant Professor of Critical Care Medicine and Director of Resuscitation Research at The State University of New York at Stony Brook, USA, and the study’s lead author, explained: “Contrary to perception, death is not a specific moment but a potentially reversible process that occurs after any severe illness or accident causes the heart, lungs and brain to cease functioning. If attempts are made to reverse this process, it is referred to as ‘cardiac arrest’; however, if these attempts do not succeed it is called ‘death’. In this study we wanted to go beyond the emotionally charged yet poorly defined term of NDEs to explore objectively what happens when we die.”

Thirty-nine per cent of patients who survived cardiac arrest and were able to undergo structured interviews described a perception of awareness, but interestingly did not have any explicit recall of events.

“This suggests more people may have mental activity initially but then lose their memories after recovery, either due to the effects of brain injury or sedative drugs on memory recall,” explained Dr Parnia, who was an Honorary Research Fellow at the University of Southampton when he started the AWARE study.

Among those who reported a perception of awareness and completed further interviews, 46 per cent experienced a broad range of mental recollections in relation to death that were not compatible with the commonly used term of NDE’s. These included fearful and persecutory experiences. Only 9 per cent had experiences compatible with NDEs and 2 per cent exhibited full awareness compatible with OBE’s with explicit recall of ‘seeing’ and ‘hearing’ events.

One case was validated and timed using auditory stimuli during cardiac arrest. Dr Parnia concluded: “This is significant, since it has often been assumed that experiences in relation to death are likely hallucinations or illusions, occurring either before the heart stops or after the heart has been successfully restarted, but not an experience corresponding with ‘real’ events when the heart isn’t beating. In this case, consciousness and awareness appeared to occur during a three-minute period when there was no heartbeat. This is paradoxical, since the brain typically ceases functioning within 20-30 seconds of the heart stopping and doesn’t resume again until the heart has been restarted. Furthermore, the detailed recollections of visual awareness in this case were consistent with verified events.

“Thus, while it was not possible to absolutely prove the reality or meaning of patients’ experiences and claims of awareness, (due to the very low incidence (2 per cent) of explicit recall of visual awareness or so called OBE’s), it was impossible to disclaim them either and more work is needed in this area. Clearly, the recalled experience surrounding death now merits further genuine investigation without prejudice.”

Further studies are also needed to explore whether awareness (explicit or implicit) may lead to long term adverse psychological outcomes including post-traumatic stress disorder.

Dr Jerry Nolan, Editor-in-Chief of Resuscitation, stated: “The AWARE study researchers are to be congratulated on the completion of a fascinating study that will open the door to more extensive research into what happens when we die.”


Journal Reference:

  1. Parnia S, et al. AWARE—AWAreness during REsuscitation—A prospective study. Resuscitation, 2014 DOI: 10.1016/j.resuscitation.2014.09.004

Uma morte prenunciada (Folha de S.Paulo)

Bruce Babbitt e Thomas Lovejoy

8 de outubro de 2014

Brasil, Peru e outros países da OEA deveriam tratar explicitamente dos direitos dos indígenas massacrados por viverem em suas terras

Foi uma morte prenunciada por anos de avisos e ameaças repetidas. A previsão se concretizou no mês passado, quando pistoleiros assassinaram Edwin Chota, líder peruano dos ashaninka do rio Tamaya, com três companheiros numa floresta perto da fronteira com o Brasil.

O horror desse acontecimento traz à memória outro assassinato, ocorrido em Xapuri, no Brasil, em 1988 –a morte de Chico Mendes.

Vinte e seis anos depois constatamos que Chico Mendes não morreu em vão. O Brasil reagiu à sua própria consciência e à opinião mundial com reformas de suas leis florestais, incluindo a criação de reservas extrativistas, de mais reservas indígenas e outras áreas de proteção.

A questão que se coloca agora para o presidente Ollanta Humala é se o Peru conseguirá honrar a memória de Edwin Chota e se redimir dessa tragédia. Chota era um Chico Mendes de seu tempo. O horror de sua morte não pode ficar restrito à remota selva do norte do Peru.

O povo ashaninka peruano vive na região da nascente do rio Tamaya, onde tinha sido esquecido e passado despercebido até que uma nova ameaça, sob a forma da demanda por mogno e outras madeiras, começou a estender seus tentáculos até sua região remota.

Nas últimas décadas, enquanto madeireiras e traficantes foram ocupando a região, os ashaninka foram se tornando fugitivos em sua própria terra. Foram pressionados a trabalhar como guias e ameaçados de violência. Em vários momentos, Chota e seus seguidores foram forçados a atravessar a fronteira para o Brasil, onde o governo criou a reserva de Apiwtxa e enviou a Polícia Federal para retirar as madeireiras.

Em 2002, Chota e seu povo começaram a enviar petições ao governo do Peru, reivindicando a criação de uma reserva protegida do lado peruano. Recusando-se a se armar, munido apenas de facões, Chota pressionou as autoridades a dar aos ashaninka os títulos de propriedade das terras que ocupam.

Com a ajuda de ONGs peruanas, aliados indígenas e apoiadores internacionais, os ashaninka concluíram o trabalho técnico de delinear os limites de sua terra e registraram o pedido de reconhecimento delas.

Contudo, depois de mais de dez anos, ainda não conseguiram persuadir os governos regional e nacional a agir. Seus líderes eleitos os abandonaram. Falaram mais alto o dinheiro e a influência de madeireiras, serrarias e outros participantes na cadeia escusa da exportação de mogno aos EUA e à Europa.

O presidente Humala prometeu uma investigação. Para reparar a tragédia, o governo peruano precisa levar os responsáveis à Justiça.

Até agora, no entanto, as autoridades peruanas guardam silêncio quanto às reformas necessárias para frear a violência que se espalha pela região, a fim de criar uma reserva para os ashaninka e controlar a extração ilegal de madeira.

Ao mesmo tempo, Peru, Brasil e outros países da Organização dos Estados Americanos, além da ONU, deveriam tratar explicitamente dos direitos dos povos indígenas massacrados por viverem em suas próprias terras. Esse é um desafio de direitos humanos tão urgente quanto aqueles dos conflitos globais sobre os quais lemos diariamente.

Tomando medidas concretas e promulgando reformas amplas, emulando o precedente criado pelo Brasil após o assassinato de Chico Mendes, o Peru e a comunidade global poderão honrar Edwin Chota e outros mártires, conferindo algum sentido a essa tragédia.

Falta de chuva reforça necessidade de usinas nucleares, dizem especialistas (Agência Brasil)

Especialistas participaram do 3º Seminário sobre Energia Nuclear, na Universidade Estadual do Rio de Janeiro (UERJ)

A falta de chuva em diversas regiões do país, principalmente no Sudeste, aponta para a necessidade de se prosseguir com os investimentos em usinas nucleares. A seca, além de afetar o fornecimento de água para a população, também compromete a geração de energia das usinas hidrelétricas, aumentando a importância das nucleares. A avaliação é de especialistas que participaram do 3º Seminário sobre Energia Nuclear, na Universidade Estadual do Rio de Janeiro (UERJ), iniciado ontem, 7, e que se encerra nesta quarta-feira, 8.

O presidente das Indústrias Nucleares do Brasil (INB), Aquilino Senra, frisou que a matriz energética brasileira é muito baseada na hidreletricidade, que vem sendo afetada pelas reiteradas e prolongadas secas nos últimos anos.

“No Brasil, a produção hídrica contribui com 92% de toda energia gerada. Os 8% restantes vêm de uma complementação térmica, na qual a nuclear tem um papel de 4%. Essa situação de baixos reservatórios levará a uma tomada de decisão mais rápida sobre a expansão da produção de energia nuclear. É inevitável, nas próximas décadas, um potencial de crescimento nuclear”, disse Senra.

O supervisor da Gerência de Análise de Segurança Nuclear da Eletronuclear, Edson Kuramoto, disse que a menor quantidade de chuva nos últimos anos forçou o governo a utilizar totalmente as usinas térmicas, incluindo as nucleares, para garantir o fornecimento. “Hoje está demonstrado que a matriz energética brasileiras é hidrotérmica.

Desde 2012, com a redução das chuvas, os reservatórios estão baixos e as térmicas foram despachadas justamente para complementar a falta da geração hidráulica. A energia nuclear tem que ser lembrada, porque o Brasil domina o ciclo e nós temos grandes reservas do combustível”, disse Kuramoto.

Segundo Kuramoto, além das usinas Angra 1 e 2, já em funcionamento, e Angra 3, em construção, o país precisará de pelo menos mais quatro usinas nucleares, sendo duas no Nordeste e duas no Sudeste. “O potencial de hidrelétricas que temos ainda é no Norte do país, mas está difícil o licenciamento de novas usinas com reservatórios. No passado, nossas hidrelétricas suportavam um recesso de chuvas de seis ou sete meses, hoje é três meses. Então o país vai ter que investir nas usinas térmicas. Até 2030, finda o nosso potencial hidráulico. A partir daí, o Brasil terá de construir novas térmicas, sejam nucleares, a gás, óleo combustível ou carvão.”

Segundo o presidente da INB, o Brasil tem garantidas reservas de urânio pelos próximos 120 anos pelo menos. Isso garante um custo baixo do combustível, que ainda tem a vantagem de não emitir gases de efeito estufa. Para Senra, a questão da segurança, muito questionada por causa do acidente da Usina de Fukushima, no Japão, já está solucionada com as novas gerações de usinas.

“Os reatores de Fukushima são de segunda geração. Os que estão começando a ser instalados agora são de terceira geração e neles não ocorreriam acidentes como os que já ocorreram, seja em 1979, nos Estados Unidos [em Three Mile Island, Pensilvânia], ou em 1986, em Chernobil [Ucrânia], e em 2011, em Fukishima”, explicou Senra.

(Vladimir Platonow/Agência Brasil)

http://agenciabrasil.ebc.com.br/geral/noticia/2014-10/falta-de-chuva-reforca-necessidade-de-usinas-nucleares-dizem-especialistas

Dowsers in the military (Ohio Buckeye Dowsers website)

Accessed Oct 6, 2014

General Rommel of the German Army- Don Nolan

http://www.tamar-dowsers.co.uk/articles/history.htm

General Patton “(U.S. Army). General Patton had a complete willow tree flown to Morocco so that a dowser could use branches from it to find water to replace the wells the German Army had blown up. The British army used dowsers on the Falkland Island to remove mines.”

– Don Nolan

http://www.tamar-dowsers.co.uk/articles/history.htm

“General Patten had two young men from Tennessee transferred to his unit. It is said that an Army moves on it’s belly, I suggest that it and it’s machines need water as well. Without these water wells we would have lost our butts on that front.”

http://www.oocities.org/dowser.geo/dowse.html

Vernon Cameron, “a dowser, told Navy officials, where all the U.S. and other submarines were located by map dowsing. They would not confirm or deny his findings, but a few years later he wasdenied a passport because he was considered a security risk.”

– Don Nolan

http://www.tamar-dowsers.co.uk/articles/history.htm

Hanna Kroeger – “…for years Cal-Tech was teaching the use of the pendulum to especially bright and interested graduate students. …So let’s join the smart and intelligent crowd and use the pendulum.”

http://www.zhealthinfo.com/pendulum.html  

Louis Matachia – “…in the late 1960’s, a dowser named Louis Matachia did demonstrate dowsing at Quantico, on a mock-up of a Vietnamese village. However, I don’t believe he ever “trained” the Marines in dowsing, or that dowsing was ever officially sanctioned by any service.”

http://forums.randi.org/archive/index.php/t-205.html

“In the USA, Louis J Matacia is a surveyor who has studied dowsing for years.  During the Vietnam War he was commissioned to teach dowsing skills to US Marines so that they could avoid booby traps, navigate safely through jungles and learn the whereabouts of the enemy. Soldiers reported that using the L-rod in this way saved many lives. Louis is particularly interested in the challenge of the search. Using his dowsing together with a range of scientific devices he has located lost pipes, oil, wells, caves and buried treasures.”

http://www.americaninsurancedepot.com/help/dowsing.htm

“The New York Times reported that the U.S. Marine Corps used dowsing in Vietnam (Baldwin, 1967)”

http://www.tricksterbook.com/ArticlesOnline/Dowsing.htm

“By Cosmos. Comment posted 07-Feb-2006 @05:14pm:”I’ve seen it work in Viet Nam to locate enemy tunnels. We would use copper L shaped rods and when we walked over a tunnel the rods would cross. We would dig down and always find them.
I also witnessed a wooden divining rod find water in Viet Nam – in the highlands where it was not always so easy to find. In this case the “diviner” was a “Sea Bee” and he walked around with this stick and when he got to a certain spot the stick twisted so much in his hands the bark split off. I thought he was twisting the stick himself so I asked him if I could try it and sure enough I could feel it twisting also. He put a stake in the ground where he wanted to drilling rig to drill and left the area. When he came back he found the engineers had started drilling about 5 feet from his stake. After drilling over 200 feet down they didn’t hit water. The Sea Bee then ordered them to drill where his stake was and they hit water at 75 feet.”

http://j-walkblog.com/index.php?/weblog/comments/dowsing/

“During the Viet Nam conflict ( War for lack of a better term) We used dowsers to locate enemy tunnel systems and weapons cache’s. Here our military brought in teams of dowsers, not to simply locate these materials, but to teach the skill to others. Then came the job nobody wanted, the “Tunnel Rat”. The poor bastard that armed with a side arm and a satchel charge of c-4; would enter these underground labyrinths to seek and destroy. Not a bad job till you find out that most had to be done by complete darkness in the tunnel in case there was a guard on duty. If that weren’t bad enough, our little buddies sometimes left behind a few small pit vipers. Yes no one except for the few volunteered for this job!”

http://www.geocities.com/dowser.geo/dowse.html

“Armed Forces (dowsing used by the British Army since Colonial times); dowsing appeared in USSR army manuals in 1930 for the finding of water in remote areas; dowsing used by the First and Third US Marine Divisions in Vietnam, 1967, as a simple, low-cost method for locating Vietcong tunnels, which were used for communication, storage depots, supply network, command posts, training centres, hospitals and sally ports for over twenty years (Bossart 1968 in the Project Poorboy Annual Progress Report; Bird 1979, Chapter 11)).”

http://www-sop.inria.fr/agos/sis/dowsing/dowsdean.html

Robert A. Swanson is author of “The Miracle of Dowsing: How This Dowser Found the Ace of Spades Saddam”. [I found this one interesting… whether it is true or not…I’ll leave that up to you! – bfg]

http://www.ebookmall.com/ebook/186849-ebook.htm

Bolivianos apelam ao diabo contra montanha ‘comedora de gente’ (BBC)

4 outubro 2014

Foto: Catharina Moh/BBC

Minas de Cerro Rico são fonte de riqueza e temor para moradores da região (Foto: Catharina Moh/BBC)

As minas da montanha de Cerro Rico, na Bolívia, têm cerca de 500 anos de idade e delas saiu a prata que gerou riquezas ao antigo império espanhol.

Mas, agora, a região está cheia de túneis e perigos, o que transforma a montanha em uma armadilha para homens e meninos que trabalham no local.

Tanto que a população chega a apelar até para o diabo, rogando por segurança: a superstição fez com que os trabalhadores colocassem imagens de uma criatura com chifres nos túneis.

Marco, 15 anos, um dos moradores da região, trabalha em um destes túneis perigosos, coberto de suor e poeira. Ele carrega rochas em um carrinho de mão – algo que repete entre 35 e 40 vezes durante seu turno de cinco horas de trabalho, frequentemente à noite, depois de passar o dia na escola.

A mãe de Marco e se mudou para Cerro Rico com os quatro filhos, depois que o pai foi embora. Eles vivem na entrada de um dos túneis, sem água corrente e usando uma mina abandonada como banheiro.

“Quero ser uma pessoa melhor, não trabalhar na mina… Gostaria de me formar, ser advogado”, diz Marco, cuja família depende de seu salário.

Na era colonial espanhola, a montanha produziu toneladas e mais toneladas de prata. Durante o mesmo período, estima-se que 8 milhões de pessoas tenham morrido no local, o que deu a Cerro Rico o apelido de Montanha que Devora Homens.

Hoje cerca de 15 mil mineiros trabalham na montanha, e uma associação local informa que 14 mulheres da região ficam viúvas a cada mês. A expectativa de vida é de 40 anos em média.

Acidentes

Foto: Catharina Moh/BBCMarco trabalha na mina há um ano (Foto: Catharina Moh/BBC)

Como todos os que trabalham na montanha, Marco teme os acidentes e também a silicose, uma doença causada pela inalação de poeira. Marco conta que o cunhado morreu antes dos 30 anos devido à doença.

“Você come a poeira, vai para seus pulmões e te ataca”, disse Olga, mãe solteira que guarda os equipamentos para os mineiros.

Os filhos de Olga, Luis, 14 anos, e Carlos, 15, trabalham levando os carrinhos de mão, como Marco. Às vezes eles começam a trabalhar às 2h da madrugada para completar o turno de oito horas antes de ir para a escola.

Eles também enfrentam outro perigo da montanha – o gás tóxico liberado nas rochas.

“Os pés ficam fracos e você tem dor de cabeça. O gás é o que fica depois que a dinamite explode”, explicou Carlos.

Uma mulher contou que o marido respirou o gás, ficou tonto e caiu em um poço da mina, onde morreu.

O grande número de mortes acaba gerando superstições.

Os homens e meninos mastigam folhas de coca, afirmando que isso ajuda a filtrar a poeira. Eles também fazem oferendas de folhas de coca junto com bebida alcoólica e cigarros para El Tio, o deus-demônio das minas.

Cada uma das 38 empresas que gerenciam as minas na montanham tem uma estátua do El Tio em seus túneis.

Foto: Catharina Moh/BBCTúneis contam com estátuas de El Tio, que recebem oferendas (Foto: Catharina Moh/BBC)

“Ele tem chifres porque é o deus das profundezas”, disse Grover, chefe de Marco. “Geralmente nos reunimos aqui às sexta-feiras para fazer as oferendas, agradecendo por ele ter nos dado muitos minerais, e também para pedir proteção dele contra acidentes.”

“Fora da mina, somos católicos, quando entramos, adoramos o diabo”, disse.

Mais crianças

Marco e Luis não são os mais jovens trabalhando nas minas.

Foto: Catharina Moh/BBCLuis masca folhas de coca antes de começar a trabalhar (Foto: Catharina Moh/BBC)

“Há dez crianças que vejo (trabalhando). Quando elas vêm aqui, têm bolhas nas mãos, então acho que estão dentro das minas. Crianças de oito, nove, dez anos..”, disse Nicolas Marin Martinez, diretor da única escola da montanha, mantida por uma organização de caridade suíça.

Uma mudança recente na lei da Bolívia permite que crianças de dez anos trabalhem legalmente, mas não nas minas, consideradas perigosas demais.

No entanto, um relatório do ombudsman do governo da Bolívia estima que 145 crianças trabalham nas minas. Outra estimativa sugere que o número de crianças trabalhando na montanha possa chegar a 400.

Apesar de tudo isso, o FMI afirma que a Bolívia reduziu seus níveis de pobreza e quase triplicou a renda per capita desde que o presidente Evo Morales assumiu o cargo, em 2005.

No dia 12 de outubro, Morales tentará ser eleito para o terceiro mandato, prometendo devolver aos pobres as riquezas da terra.

Para os que vivem em Cerro Rico, os benefícios do governo de Morales parecem ainda não ter chegado.

Can Big Data Tell Us What Clinical Trials Don’t? (New York Times)

CreditIllustration by Christopher Brand

When a helicopter rushed a 13-year-old girl showing symptoms suggestive of kidney failure to Stanford’s Packard Children’s Hospital, Jennifer Frankovich was the rheumatologist on call. She and a team of other doctors quickly diagnosed lupus, an autoimmune disease. But as they hurried to treat the girl, Frankovich thought that something about the patient’s particular combination of lupus symptoms — kidney problems, inflamed pancreas and blood vessels — rang a bell. In the past, she’d seen lupus patients with these symptoms develop life-threatening blood clots. Her colleagues in other specialties didn’t think there was cause to give the girl anti-clotting drugs, so Frankovich deferred to them. But she retained her suspicions. “I could not forget these cases,” she says.

Back in her office, she found that the scientific literature had no studies on patients like this to guide her. So she did something unusual: She searched a database of all the lupus patients the hospital had seen over the previous five years, singling out those whose symptoms matched her patient’s, and ran an analysis to see whether they had developed blood clots. “I did some very simple statistics and brought the data to everybody that I had met with that morning,” she says. The change in attitude was striking. “It was very clear, based on the database, that she could be at an increased risk for a clot.”

The girl was given the drug, and she did not develop a clot. “At the end of the day, we don’t know whether it was the right decision,” says Chris Longhurst, a pediatrician and the chief medical information officer at Stanford Children’s Health, who is a colleague of Frankovich’s. But they felt that it was the best they could do with the limited information they had.

A large, costly and time-consuming clinical trial with proper controls might someday prove Frankovich’s hypothesis correct. But large, costly and time-consuming clinical trials are rarely carried out for uncommon complications of this sort. In the absence of such focused research, doctors and scientists are increasingly dipping into enormous troves of data that already exist — namely the aggregated medical records of thousands or even millions of patients to uncover patterns that might help steer care.

The Tatonetti Laboratory at Columbia University is a nexus in this search for signal in the noise. There, Nicholas Tatonetti, an assistant professor of biomedical informatics — an interdisciplinary field that combines computer science and medicine — develops algorithms to trawl medical databases and turn up correlations. For his doctoral thesis, he mined the F.D.A.’s records of adverse drug reactions to identify pairs of medications that seemed to cause problems when taken together. He found an interaction between two very commonly prescribed drugs: The antidepressant paroxetine (marketed as Paxil) and the cholesterol-lowering medication pravastatin were connected to higher blood-sugar levels. Taken individually, the drugs didn’t affect glucose levels. But taken together, the side-effect was impossible to ignore. “Nobody had ever thought to look for it,” Tatonetti says, “and so nobody had ever found it.”

The potential for this practice extends far beyond drug interactions. In the past, researchers noticed that being born in certain months or seasons appears to be linked to a higher risk of some diseases. In the Northern Hemisphere, people with multiple sclerosis tend to be born in the spring, while in the Southern Hemisphere they tend to be born in November; people with schizophrenia tend to have been born during the winter. There are numerous correlations like this, and the reasons for them are still foggy — a problem Tatonetti and a graduate assistant, Mary Boland, hope to solve by parsing the data on a vast array of outside factors. Tatonetti describes it as a quest to figure out “how these diseases could be dependent on birth month in a way that’s not just astrology.” Other researchers think data-mining might also be particularly beneficial for cancer patients, because so few types of cancer are represented in clinical trials.

As with so much network-enabled data-tinkering, this research is freighted with serious privacy concerns. If these analyses are considered part of treatment, hospitals may allow them on the grounds of doing what is best for a patient. But if they are considered medical research, then everyone whose records are being used must give permission. In practice, the distinction can be fuzzy and often depends on the culture of the institution. After Frankovich wrote about her experience in The New England Journal of Medicine in 2011, her hospital warned her not to conduct such analyses again until a proper framework for using patient information was in place.

In the lab, ensuring that the data-mining conclusions hold water can also be tricky. By definition, a medical-records database contains information only on sick people who sought help, so it is inherently incomplete. Also, they lack the controls of a clinical study and are full of other confounding factors that might trip up unwary researchers. Daniel Rubin, a professor of bioinformatics at Stanford, also warns that there have been no studies of data-driven medicine to determine whether it leads to positive outcomes more often than not. Because historical evidence is of “inferior quality,” he says, it has the potential to lead care astray.

Yet despite the pitfalls, developing a “learning health system” — one that can incorporate lessons from its own activities in real time — remains tantalizing to researchers. Stefan Thurner, a professor of complexity studies at the Medical University of Vienna, and his researcher, Peter Klimek, are working with a database of millions of people’s health-insurance claims, building networks of relationships among diseases. As they fill in the network with known connections and new ones mined from the data, Thurner and Klimek hope to be able to predict the health of individuals or of a population over time. On the clinical side, Longhurst has been advocating for a button in electronic medical-record software that would allow doctors to run automated searches for patients like theirs when no other sources of information are available.

With time, and with some crucial refinements, this kind of medicine may eventually become mainstream. Frankovich recalls a conversation with an older colleague. “She told me, ‘Research this decade benefits the next decade,’ ” Frankovich says. “That was how it was. But I feel like it doesn’t have to be that way anymore.”

Racionamento de água já atinge 2,77 milhões de pessoas em São Paulo (Folha de S.Paulo)

JOÃO ALBERTO PEDRINI

CAMILA TURTELLI
DE RIBEIRÃO PRETO
WILLIAM CARDOSO
DO AGORA

04/10/2014 02h00

Apesar das chuvas que atingiram algumas regiões do Estado nos últimos dias, o racionamento oficial de água já atinge 2,77 milhões de pessoas em 25 municípios.

O número de habitantes afetados é 32% maior do que em agosto, quando levantamento da Folha mostrou que 2,1 milhões viviam sob rodízio em 18 cidades.

O racionamento oficial ocorre em municípios onde os serviços de abastecimento de água e tratamento de esgoto são de responsabilidade das prefeituras.

Não há na lista cidades em que o sistema é gerenciado pela Sabesp, embora a empresa venda água para algumas delas.

O problema atinge cidades que captam água de rios, lagoas, represas, córregos, reservatórios e poços subterrâneos. Nenhuma delas tem prazo para o fim do rodízio.

Alex Argozino/Editoria de Arte/Folhapress

Segundo a Defesa Civil, as chuvas registradas de janeiro a setembro no Estado foram 21,3% menores do que a média histórica. Foram 12.972 mm ante média de 17.174 mm.

Em Valinhos (a 85 km de São Paulo) a prefeitura admite que o racionamento deve seguir por mais um ano. Duas vezes por semana, a cidade fica 18 horas sem água.

Metade da água é do sistema Cantareira, 5% de poços e 45% de represas, que estão com níveis baixos.

A prefeitura diz que investirá na ampliação do tratamento, hoje no limite. Com o investimento, de cerca de R$ 3 milhões, será possível captar mais água do rio Atibaia.

Cravinhos (a 292 km de São Paulo), assim como Uchoa (a 416 km de São Paulo), só capta de poços e vive a mesma situação.

“Todo ano, em períodos secos, percebemos alta no consumo, mas nunca precisamos racionar. É a primeira vez”, disse Claudio Henrique Alves Cairo, superintendente do setor de água e esgoto.

O maior município com racionamento no Estado é Guarulhos (a 16 km de São Paulo). Lá, 13% da água é captada por meio de produção própria e 87% são comprados da Sabesp.

A prefeitura diz que estuda ampliar a captação em novos mananciais.

Em Mauá (a 27 km de São Paulo), que também compra água da Sabesp, o racionamento começou na última quarta. O município, diz que o fornecimento caiu 22% desde julho. Moradores dizem que sofrem com o problema há três meses.

Oficialmente, a cidade foi dividida em cinco partes e cada uma fica sem água durante um dia da semana, de segunda a sexta-feira.

O aposentado Luiz Carlos Lissoni, 56, já chegou a ficar quatro dias seguidos sem água e ontem estava com a torneira seca. Para minimizar os problemas, comprou uma caixa de 1.500 litros por R$ 410 e tinha outra de 1.000 litros.

“Tenho uma mulher doente, que precisa de mais de um banho por dia”, diz.

Fall in monsoon rains driven by rise in air pollution, study shows (Science Daily)

Date: October 1, 2014

Source: University of Edinburgh

Summary: Emissions produced by human activity have caused annual monsoon rainfall to decline over the past 50 years, a study suggests. In the second half of the 20th century, the levels of rain recorded during the Northern Hemisphere’s summer monsoon fell by as much as 10 per cent, researchers say. Changes to global rainfall patterns can have serious consequences for human health and agriculture.


Emissions produced by human activity have caused annual monsoon rainfall to decline over the past 50 years, a study suggests.

In the second half of the 20th century, the levels of rain recorded during the Northern Hemisphere’s summer monsoon fell by as much as 10 per cent, researchers say. Changes to global rainfall patterns can have serious consequences for human health and agriculture.

Scientists found that emissions of tiny air particles from human-made sources — known as anthropogenic aerosols — were the cause. High levels of aerosols in the atmosphere cause heat from the sun to be reflected back into space, lowering temperatures on Earth’s surface and reducing rainfall.

Levels of aerosol emissions have soared since the 1950s, with the most common sources being power stations and cars.

Researchers at the University of Edinburgh say their work provides clear evidence of human-induced rainfall change. Alterations to summer monsoon rainfall affect the lives of billions of people, mostly those living in India, South East Asia and parts of Africa.

The team calculated the average summer monsoon rainfall in the Northern Hemisphere between 1951 and 2005. They used computer-based climate models to quantify the impact of increasing aerosol emissions and greenhouse gases over the same period. They also took account of natural factors such as volcanic eruptions and climate variability to gauge the impact of human activity on the amount of monsoon rainfall.

Researchers say levels of human-made aerosols are expected to decline during the 21st century as countries begin adopting cleaner methods of power generation.

The study is published in the journal Geophysical Research Letters. The work was funded by the Natural Environmental Research Council, European Research Council and National Centre for Atmospheric Science.

Lead author Dr Debbie Polson, of the University of Edinburgh’s School of GeoSciences, said: “This study shows for the first time that the drying of the monsoon over the past 50 years cannot be explained by natural climate variability and that human activity has played a significant role in altering the seasonal monsoon rainfall on which billions of people depend.”

Journal Reference:

  1. D. Polson, M. Bollasina, G. C. Hegerl, L. J. Wilcox. Decreased monsoon precipitation in the Northern Hemisphere due to anthropogenic aerosols.Geophysical Research Letters, 2014; 41 (16): 6023 DOI: 10.1002/2014GL060811

Bactéria pode ter sistema imune rudimentar, indica estudo (Fapesp)

03 de outubro de 2014

Por Karina Toledo

Agência FAPESP – Um estudo publicado na revista Nature Communications revelou que a bactéria Salmonella enterica é capaz de produzir uma proteína muito semelhante à alfa-2-macroglobulina humana, que desempenha um papel-chave em nosso sistema imunológico.

A hipótese levantada pelos pesquisadores do Instituto de Biologia Estrutural (IBS) de Grenoble, na França, é de que também nas bactérias as macroglobulinas poderiam fazer parte de um sistema de defesa rudimentar. Se a teoria for confirmada por estudos futuros, essas proteínas podem se tornar alvos para o desenvolvimento de novos antibióticos.

“O mais fascinante é que as macroglobulinas são proteínas imensas, formadas por quase 1.700 resíduos de aminoácidos. Para a bactéria sintetizar uma molécula tão grande é porque ela deve ter um papel muito importante”, afirmou a brasileira Andréa Dessen, pesquisadora do IBS e coordenadora, no Laboratório Nacional de Biociência (LNBio), em Campinas, de um projeto apoiado pela FAPESP por meio do programa São Paulo Excellence Chairs (SPEC).

No organismo humano, a missão da alfa-2-macroglobulina é detectar e neutralizar proteases secretadas por microrganismos invasores, disse a pesquisadora. As proteases são enzimas que quebram as ligações entre os aminoácidos das proteínas.

“A macroglobulina impede, dessa forma, que as proteases dos invasores destruam os tecidos do organismo, o que permitiria a infecção de tecidos mais profundos”, explicou.

Além disso, a alfa-2-macroglobulina também se liga a proteases que participam do processo de coagulação sanguínea, evitando que proteínas importantes sejam destruídas indevidamente.

Em estudos anteriores, nos quais o genoma de diversas espécies de bactérias foi sequenciado, pesquisadores alemães já haviam observado a presença do gene da macroglobulina. No IBS, o grupo liderado por Dessen já havia feito a caracterização bioquímica da proteína produzida pelas espécies Escherichia coli e Pseudomonas aeruginosa.

“Agora, de maneira inédita, estudamos a estrutura tridimensional da macroglobulina secretada pela Salmonella enterica por uma técnica conhecida como cristalografia de raios X, que permite visualizar detalhes em nível atômico. E pudemos confirmar que, de fato, ela é muito parecida com a macroglobulina humana”, contou Dessen.

De acordo com a pesquisadora, a descoberta reforça a hipótese de que a alfa-2-macroglobulina tem o papel de proteger a bactéria das proteases secretadas por outras bactérias ou pelo organismo do hospedeiro que ela tenta infectar.

“Em um modelo de camundongo, pesquisadores canadenses mostraram que cepas da bactéria Pseudomonas aeruginosa que não produzem macroglobulina têm menor capacidade de causar doença, ou seja, são menos virulentas. A proteína parece dar uma vantagem à bactéria na hora de colonizar o hospedeiro, mas ainda não sabemos exatamente por quê”, disse.

Desdobramentos

Em um braço da pesquisa que está sendo conduzido no LNBio, com apoio da FAPESP e orientação de Dessen, a pós-doutoranda francesa Samira Zouhir investiga a estrutura da macroglobulina sintetizada por bactérias da espécie Pseudomonas aeruginosa – causadora de diversos casos de infecção hospitalar.

“Se conseguirmos desvendar a estrutura tridimensional da proteína, isso nos dará pistas sobre sua função no processo infeccioso”, disse Dessen.

Quando o papel das macroglobulinas estiver bem compreendido em diferentes espécies de bactérias, acrescentou, essas proteínas poderão se tornar alvo para o desenvolvimento de novos antibióticos.

“Também há pesquisas interessantes em modelo de camundongo mostrando que a aplicação de alfa-globulina humana pode oferecer proteção contra a sepse. Há várias possibilidades de tratamento a serem exploradas”, avaliou a pesquisadora.

O artigo Structure of a bacterial α2-macroglobulin reveals mimicry of eukaryotic innate immunity (doi: 10.1038/ncomms5917), pode ser lido em www.nature.com/ncomms/2014/140915/ncomms5917/full/ncomms5917.html.

Doing math with your body (Science Daily)

Date: October 2, 2014

Source: Radboud University

Summary: You do math in your head most of the time, but you can also teach your body how to do it. Researchers investigated how our brain processes and understands numbers and number size. They show that movements and sensory perception help us understand numbers.


In this example the physically largest number (2) is the smallest in terms of meaning. It was harder for test subjects to identify a 2 as the physically largest number then it was for them to identify a 9 as the largest number. Credit: Image courtesy of Radboud University

You do math in your head most of the time, but you can also teach your body how to do it. Florian Krause investigated how our brain processes and understands numbers and number size. He shows that movements and sensory perception help us understand numbers. Krause defends his thesis on October 10 at Radboud University.

When learning to do math, it helps to see that two marbles take up less space than twenty. Or to feel that a bag with ten apples weighs more than a bag with just one. During his PhD at Radboud University’s Donders Institute, Krause investigated which brain areas represent size and how these areas work together. He concludes that number size is associated with sizes experienced by our body.

Physically perceived size

Krause asked tests subjects to find the physically largest number in an image with eighteen numbers. Sometimes this number was also the largest in terms of meaning, but sometimes it wasn’t. Subjects found the largest number faster when it was also the largest in terms of meaning. ‘This shows how sensory information about small and large is associated with our understanding of numbers’, Krause says. ‘Combining this knowledge about size makes our processing of numbers more effective.’

More fruit, more force

Even very young children have a sensory understanding of size. In a computer game, Krause asked them to lift up a platform carrying a few or many pieces of fruit by pressing a button. Although the amount of force applied to the button did not matter — simply pressing it was adequate — children pushed harder when there was a lot of fruit on the platform and less hard when there was little fruit on the platform.

Applications in education

Krause believes his results can provide applications in math education. ‘If numerical size and other body-related size information are indeed represented together in the brain, strengthening this link during education might be beneficial. For instance by using a ‘rekenstok’ which makes you experience how long a meter or ten centimeter is when holding it with both hands. This general idea can be extended to other experiencable magnitudes besides spatial length, by developing tools which make you see an amount of light or hear an amount of sound that correlates with the number size in a calculation.’

Battle between NSF and House science committee escalates: How did it get this bad? (Science)

HOUSE COMMITTEE ON SCIENCE, SPACE & TECHNOLOGY. Representatives Eddie Bernice Johnson (D–TX) and Lamar Smith (R–TX)

Four times this past summer, in a spare room on the top floor of the headquarters of the National Science Foundation (NSF) outside of Washington, D.C., two congressional staffers spent hours poring over material relating to 20 research projects that NSF has funded over the past decade. Each folder contained confidential information that included the initial application, reviewer comments on its merit, correspondence between program officers and principal investigators, and any other information that had helped NSF decide to fund the project.

The visits from the staffers, who work for the U.S. House of Representatives committee that oversees NSF, were an unprecedented—and some say bizarre—intrusion into the much admired process that NSF has used for more than 60 years to award research grants. Unlike the experts who have made that system work so well, however, the congressional staffers weren’t really there to judge the scientific merits of each proposal. But that wasn’t their intent.

The Republican aides were looking for anything that Representative Lamar Smith (R–TX), their boss as chair of the House Committee on Science, Space, and Technology, could use to support his ongoing campaign to demonstrate how the $7 billion research agency is “wasting” taxpayer dollars on frivolous or low-priority projects, particularly in the social sciences. The Democratic staffers wanted to make sure that their boss, Representative Eddie Bernice Johnson (D–TX), the panel’s senior Democrat, knew enough about each grant to rebut any criticism that Smith might levy against the research.

The peculiar exercise is part of a long-running and bitter battle that is pitting Smith and many of his panel’s Republican members against Johnson and the panel’s Democrats, NSF’s leadership, and the academic research community. There’s no end in sight: The visits are expected to continue into the fall, because NSF has acceded—after some resistance—to Smith’s request to make available information on an additional 30 awards. (Click here to see a spreadsheet of the requested grants.)

And the feud appears to be escalating. This week, Johnson wrote to Smith accusing him “of go[ing] after specific peer-reviewed grants simply because the Chairman personally does not believe them to be of high value.”  (Click here to see a PDF of Johnson’s letter and related correspondence from Smith and NSF.)

Smith, however, argues he is simply taking seriously Congress’s oversight responsibility. And he promises to stay the course: “Our efforts will continue until NSF agrees to only award grants that are in the national interest,” he wrote in a 2 October e-mail to ScienceInsider.

Ask, answered

How did things get to this point? For the past 18 months, Smith has waged a very public assault on NSF’s storied peer-review system. He’s issued a barrage of press releases that ridicule specific awards, championed legislation that would alter NSF’s peer-review system and slash funding for the social science programs that have supported much of the research he has questioned, and berated NSF officials for providing what he considers to be inadequate explanations of their funding decisions.

NSF has defended itself at congressional hearings, in personal meetings with committee staff and the chair, and with a stream of letters and e-mails. White House officials, university leaders, and Democratic legislators have joined the fray, roundly criticizing Smith for what they see as an attempt to impose his political judgment on a process that draws upon the wisdom of scientific experts. But that nearly universal condemnation hasn’t stopped Smith, who was first elected to Congress in 1986 and last year was named chairman of the science committee.

Smith describes his growing frustration with NSF in a 27 August letter to NSF Director France Córdova. (The committee made this and another letter available to ScienceInsider.) Smith notes that he first asked for materials relating to several grants in the spring of 2013, soon after Cora Marrett became acting NSF director following Subra Suresh’s resignation to become president of Carnegie Mellon University.

But after being rebuffed by Marrett, Smith writes that he “set aside the request … until a permanent NSF director was installed.” Córdova was confirmed by the Senate this past March, and on 7 April Smith wrote her a letter containing a list of 20 grants that he wanted to examine.

Smith’s request created a major dilemma for NSF. On the one hand, Córdova knew that Congress has the authority to obtain information as part of its job to oversee the actions of federal agencies, a right that federal courts have repeatedly upheld. On the other hand, NSF constantly assures scientists that every aspect of the peer-review process will remain confidential. (NSF’s website contains abstracts of projects it has funded, and the public can obtain a copy of a successful application. NSF does not share any information about, or even acknowledge the existence of, proposals that have been rejected.)

Smith wanted the material shipped to his offices on Capitol Hill. But Córdova made a counteroffer that the Texas legislator grudgingly accepted. First, the committee staff could see everything related to the grant except for the names of the reviewers, which would be redacted. Second, the material would remain at NSF headquarters in Arlington, Virginia. Third, the staff could take copious notes, but none of the information could be photocopied or otherwise reproduced.

Judy Gan, head of public and legislators affairs at NSF, says the arrangement “preserves the integrity of the merit review process.” Even so, NSF officials have sent letters to the president of each university with a grant on Smith’s hit list, hoping to reassure them that everything is under control. NSF had no choice but to comply with the committee’s request, the letters explain. But NSF chose to tell each institution about the request “so that you may take appropriate action to inform your principal investigator and other potentially impacted parties about this production of documents.”

In many cases, NSF staffers had already sounded the alarm. Steven Folmar, a cultural anthropologist at Wake Forest University in Winston-Salem, North Carolina, recalls getting a call from his program manager last month alerting him to the science committee’s pending review of his 2012 grant, titled “Oppression and Mental Health in Nepal.” The 3-year, $160,000 award supported him and two colleagues in a study of how social status affects the mental health of Nepalese adolescents. Folmar has worked on and off in Nepal since 1979, and he says the country’s economic and cultural divisions are so striking that it’s an ideal place to measure the impact of discrimination on those in the lowest caste.

Folmar says that his first reaction after hearing that his grant had been singled out was to hunker down and keep quiet. “I felt like somebody in a war movie, with bullets whizzing over my head.” But after further reflection, he thinks that speaking up may not be such a bad idea.

“I’d tell [Smith] that our work has a great deal of relevance to this country,” he says. Measuring how social inequality can cause depression and anxiety is valuable information for U.S. public health officials, too, he explains, noting that some Nepalese victims display symptoms akin to post-traumatic stress disorder.

The project was a bargain, he adds. The grant covered several months of field work by three senior researchers and their graduate students, he notes, “all for about $50,000 a year. That’s pretty cheap science.”

Parsing the list

The scientific community is scratching its head over how Smith compiled his list of questionable grants. Many have also been flagged by other legislators, notably Senator Tom Coburn (R–OK), who issue annual lists of what they consider to be wasteful government spending. Research grants often appear on such lists. Decades ago, former Senator William Proxmire (D–WI) created what he called the Golden Fleece Awards to poke fun at such supposed boondoggles. In fact, the practice has become so widespread that 3 years ago a coalition of scientific organizations created a counterpoint, called the Golden Goose Awards, which honors federally funded basic research that later turned out to have huge societal benefits.

But Proxmire’s awards were never meant to fundamentally alter NSF’s peer-review system, according to Folmar. “This sounds like Golden Fleece with a much more dangerous twist,” he says.

Smith so far has asked to take a look at 50 grants. (Note: ScienceInsider was able to identify just 47 unique awards.) And the list is hard to characterize. One grant goes back to 2005, and 13 appear to have expired. The total amount of money awarded is about $26 million. The smallest grant, awarded in 2005, is $19,684 for a doctoral dissertation on “culture, change & chronic stress in lowland Bolivia.” The largest, for $5.65 million, is for a project that aims to use innovative education methods to educate Arctic communities about climate change and related issues.

More than half of the grants appear to involve work outside the United States. The largest number—29—were funded through NSF’s social, behavioral, and economic (SBE) sciences directorate. Of those, 21 came from SBE’s behavioral and cognitive sciences division, including a number of grants in archaeology and anthropology. But six of NSF’s seven directorates also funded grants on Smith’s hit list.

What the science committee expects to learn from its investigation is a burning question from scientists. A committee representative declined to answer repeated queries about the criteria used to select the grants. In his written statement to ScienceInsider, Smith said only that “there are many grants that no taxpayer would consider in the national interest, or worthy of how their hard-earned dollars should be spent. … The public deserves an explanation for why the NSF has spent hundreds of thousands of dollars on musicals about climate change, bicycle designs, and a video game that allows users to relive prom night.”

Mont Hubbard is the “bicycle designs” grantee on Smith’s intended list of shame. An emeritus professor of mechanical engineering at the University of California, Davis, Hubbard received $300,000 in 2009 to study the feedback system that allows humans to control a vehicle, in this case a bicycle. And Hubbard has a ready answer to Smith’s question about how his research could possibly serve the national interest.

“It’s easy to learn to ride a bicycle, but it’s hard to explain how we do it,” Hubbard says. His broader research into operator control of mechanical systems has applications across many areas, he explains. Substitute “pilot” for “rider” and “airplane” for “bicycle,” he says, and it’s clear that helping humans do a better job of manipulating machines has the potential to greatly improve performance, reduce safety risks, and promote economic growth.

Present stalemate

What’s next? So far, neither side has shown any signs of backing down. In his 27 August letter to Córdova, Smith declares that “the current review work is 5% complete, which implies that this oversight initiative will span at least 12 months.” He accuses her of reneging on a promise to provide the committee with everything it requested and speculates that she “may be banking on a cumbersome, time-consuming federal court process” to back her up. That approach puts NSF “in an indefensible position,” he says, predicting that such tactics will ultimately fail and that NSF will be forced to give in to his demands.

In her reply 2 weeks later, Córdova denies withholding any pertinent information. “To the contrary,” she writes, “NSF has provided the Committee full and complete access to our files for each of the grants of interest.” She disagrees with his assertion that “NSF does not trust the Committee.” But she acknowledges that “we are balancing this access with the need to preserve the trust of the scientific community, whose participation in the merit review process occurs in a confidential environment.”

With such strong rhetoric on both sides, it’s hard to see a quick or quiet ending to this confrontation. Johnson certainly seems prepared to continue defending NSF and, in particular, its funding of the social sciences. “This campaign against NSF’s merit-review system is indefensible absent some compelling explanation of what you are trying to accomplish,” she tells Smith in her 30 September letter. “If your ultimate goal is to cut funding for social and behavioral sciences …I respect your right to try to make that case as Chairman. But please do not compromise the integrity of NSF’s merit review system as part of this campaign.”

WIth reporting by David Shultz.

Correction 3 October, 8:05 a.m.: Steven Folmar studies how social inequality can contribute to, not treat, depression.

Futures of the Past – The Appendix

Futures of the Past

“Futures of the Past” is an issue about how past generations have reckoned their collective futures. But it’s also about how the razor’s edge of the present comes up against the haziness of futurity, and what happens when that hazy future becomes inscribed, remembered, and—eventually—forgotten. We’re interested here in the work that the future does in shaping history—as a utopian dream, a set of collective anxieties, or simply as a story that we tell about where we come from and where we hope to end up.


Chapter 1: Bad Predictions


Chapter 2: Futures Past


Chapter 3: The Politics of the Future

Chimp social network shows how new ideas catch on (New Scientist)

19:00 30 September 2014 by Catherine Brahic

Three years ago, an adult chimpanzee called Nick dipped a piece of moss into a watering hole in Uganda’s Budongo Forest. Watched by a female, Nambi, he lifted the moss to his mouth and squeezed the water out. Nambi copied him and, over the next six days, moss sponging began to spread through the community. A chimp trend was born.

Until that day in November 2011, chimps had only been seen to copy actions in controlled experimentsMovie Camera, and social learning had never been directly observed in the wild.

To prove that Nambi and the seven other chimps who started using moss sponges didn’t just come up with the idea independently, Catherine Hobaiter of the University of St Andrews, UK, and her colleagues used their own innovation: a statistical analysis of the community’s social network. They were able to track how moss-sponging spread and calculated that once a chimp had seen another use a moss sponge, it was 15 times more likely to do so itself.

A decade ago it was believed that only humans have the capacity to imitate, says Frans de Waal of Emory University in Atlanta, Georgia. “The present study is the first on apes to show by means of networking analysis that habits travel along paths of close relationships,” he says, adding that a similar idea was shown not long ago for humpback whale hunting techniques.

Caught in the act

Copying may seem like the easiest thing to us, but not all animals are able. Chimps at the Gombe Stream reserve in Tanzania can copy each other using twigs to fish out termites, but the baboons that watch them haven’t picked up the trick. “They don’t get it,” says Andrew Whiten of the University of St Andrews.

Whiten previously listed 39 behaviours that were found only in some communities of chimps, suggesting these were picked up from other group members rather than being innate behaviours. Since then, more have been added, but they still number in the dozens, not the thousands.

Given how rarely chimps pick up trends, it’s exciting that someone was on hand to watch it happen in this latest study, says Whiten.

Ultimately, he says, our ability to both invent and copy meant our ancestors could exploit a cognitive niche. “They began hunting large game by doing it the brainy way.” Imitation, it turns out, is not just the sincerest form of flattery, it’s also a smart thing to do.

Journal reference: PLoS Biology, DOI: 10.1371/journal.pbio.1001960

The cultural side of science communication (Northwestern University)

30-Sep-2014

Hilary Hurd Anyaso

New research explores how culture affects our conceptions of nature

EVANSTON, Ill. — Do we think of nature as something that we enjoy when we visit a national park and something we need to “preserve?” Or do we think of ourselves as a part of nature? A bird’s nest is a part of nature, but what about a house?

The answers to these questions reflect different cultural orientations. They are also reflected in our actions, our speech and in cultural artifacts.

A new Northwestern University study, in partnership with the University of Washington, the American Indian Center of Chicago and the Menominee tribe of Wisconsin, focuses on science communication and how that discipline necessarily involves language and other media-related artifacts such as illustrations. The challenge is to identify effective ways of communicating information to culturally diverse groups in a way that avoids cultural polarization, say the authors.

“We suggest that trying to present science in a culturally neutral way is like trying to paint a picture without taking a perspective,” said Douglas Medin, lead author of the study and professor of psychology in the Weinberg College of Arts and Sciences and the School of Education and Social Policy at Northwestern.

This research builds on the broader research on cultural differences in the understanding of and engagement with science.

“We argue that science communication — for example, words, photographs and illustrations — necessarily makes use of artifacts, both physical and conceptual, and these artifacts commonly reflect the cultural orientations and assumptions of their creators,” write the authors.

“These cultural artifacts both reflect and reinforce ways of seeing the world and are correlated with cultural differences in ways of thinking about nature. Therefore, science communication must pay attention to culture and the corresponding different ways of looking at the world.”

Medin said their previous work reveals that Native Americans traditionally see themselves as a part of nature and tend to focus on ecological relationships. In contrast, European-Americans tend to see humans as apart from nature and focus more on taxonomic relationships.

“We show that these cultural differences are also reflected in media, such as children’s picture books,” said Medin, who co-authored the study with Megan Bang of the University of Washington. “Books authored and illustrated by Native Americans are more likely to have illustrations of scenes that are close-up, and the text is more likely to mention the plants, trees and other geographic features and relationships that are present compared with popular children’s books not done by Native Americans.

“The European-American cultural assumption that humans are not part of ecosystems is readily apparent in illustrations,” he said.

The authors went to Google images and entered “ecosystems,” and 98 percent of the images did not have humans present. A fair number of the remaining 2 percent had children outside the ecosystem, observing it through a magnifying glass and saying, “I spy an ecosystem.”

“These results suggest that formal and informal science communications are not culturally neutral but rather embody particular cultural assumptions that exclude people from nature,” Medin said.

Medin and his research team have developed a series of “urban ecology” programs at the American Indian Center of Chicago, and these programs suggest that children can learn about the rest of nature in urban settings and come to see humans as active players in the world ecosystems.

Concea abre consulta pública para guia de uso de animais (MCTI)

Sociedade pode sugerir mudanças em propostas de manuais para pesquisa e ensino com primatas e estudos clínicos fora das instalações convencionais.

O Conselho Nacional de Controle de Experimentação Animal (Concea) abriu nesta quinta-feira (25), ao publicar  no Diário Oficial da União (DOU), uma consulta pública de 21 dias para dois capítulos do Guia Brasileiro de Produção e Utilização de Animais para Atividades de Ensino ou Pesquisa Científica.

Aprovado por etapas, o guia em elaboração contempla tópicos destinados a aves, cães, gatos, lagomorfos (como coelhos e lebres) e roedores, entre outros grupos taxonômicos.

Os capítulos sob consulta tratam de “primatas não humanos” e “estudos clínicos conduzidos a campo”. Sugestões de mudanças nos textos devem ser detalhadas e justificadas por meio do preenchimento de formulários disponíveis na página do conselho e, então, encaminhadas ao endereço eletrônico consultapubl.concea@mcti.gov.br.

“Essa participação da sociedade é importante porque o guia será a base para a definição dos requisitos necessários para a solicitação do licenciamento de atividades de pesquisa e ensino com animais, sem o qual o uso de determinada espécie não será permitido, conforme estabelecido na Lei Arouca”, destaca o coordenador do Concea, José Mauro Granjeiro.

Os dois capítulos devem incorporar considerações da sociedade antes da 26ª Reunião Ordinária do Concea, em 26 e 27 de novembro, quando a instância colegiada planeja apreciar o conteúdo e aprovar os documentos finais, a serem publicados no DOU. Nos meses seguintes, outros trechos do guia têm previsão de passar por consulta pública, abrangendo outros grupos taxonômicos como peixes, ruminantes, equinos, suínos, répteis e anfíbios.

Também nesta quinta, foi publicada uma lista com 17 métodos para substituir ou reduzir o uso de animais em testes toxicológicos. Divididos em sete grupos, as técnicas servem para medir o potencial de irritação e corrosão da pele e dos olhos, fototoxicidade, absorção e sensibilização cutânea, toxicidade aguda e genotoxicidade.

Primatas – Com 73 páginas, o capítulo acerca de primatas não humanos aborda a relevância desse conjunto de animais em análises sobre doenças virais e pesquisas biomédicas. O texto associa a “estreita relação filogenética com o homem” à utilização para estudos comparativos em enfermidades humanas.

O guia detalha requisitos mínimos para as instalações, da estrutura física dos alojamentos às áreas de criação e experimentação, passando por condições ambientais, além de procedimentos de manejo, como alimentação adequada, higienização de gaiolas e objetos, formas de contenção física, enriquecimento ambiental e medicina preventiva. Métodos experimentais, cuidados veterinários e princípios de bem-estar animal também compõem o capítulo sobre primatas.

“De uma forma geral, independentemente da finalidade da criação de primatas, o alojamento deve ser composto por um recinto complexo e estimulante, que promova a boa saúde e o bem-estar psicológico e que forneça plena oportunidade de interação social, exercício e manifestação a uma variedade de comportamentos e habilidades inerentes à espécie”, indica o texto. “O recinto satisfatório deve fornecer aos animais um espaço suficiente para que eles mantenham seus hábitos normais de locomoção e de comportamento”.

Estudos a campo – A intenção do outro documento sob consulta pública é orientar pesquisadores e definir requisitos mínimos necessários para a condução de “estudos clínicos conduzidos a campo” – aqueles realizados fora das instalações de uso animal –, quanto a aspectos éticos ligados ao manejo e ao bem-estar das espécies.

“Considerando que uma das missões do Concea é garantir que os animais utilizados em qualquer tipo de pesquisa científica tenham sua integridade e bem-estar preservados, a condução dos estudos fora dos ambientes controlados das instalações para utilização de animais em atividades de ensino ou pesquisa devem se adequar às regras aplicáveis”, afirma o guia.

Criado em 2008, o Concea é uma instância colegiada multidisciplinar de caráter normativo, consultivo, deliberativo e recursal. Dentre as suas competências destacam-se, além do credenciamento das instituições que desenvolvam atividades no setor, a formulação de normas relativas à utilização humanitária de animais com finalidade de ensino e pesquisa científica, bem como o estabelecimento de procedimentos para instalação e funcionamento de centros de criação, de biotérios e de laboratórios de experimentação animal.

(MCTI)

Rogue winds swept humans to last uninhabited islands (New Scientist)

13:00 30 September 2014 by Michael Slezak

Too far east? <i>(Image: Thomas J. Abercrombie/National Geographic Creative)</i>

Too far east? (Image: Thomas J. Abercrombie/National Geographic Creative)

Expert navigation and advanced boat-building technology were not enough for humans to finally colonise the world’s most remote islands – shifting wind patterns also played a part.

There were no humans on Easter Island in the south-eastern Pacific until the middle ages, when expert Polynesian sailors spread from the central Pacific islands. Within a few hundred years, they colonised previously uninhabited islands all across the South Pacific. But how they did so has remained a matter of some controversy.

Today winds blow from east to west in the tropics, and in the opposite direction further south. This would have made it an epic struggle against the wind to sail eastwards to Easter Island or westwards to New Zealand, and scientists have clashed over whether Polynesian seafaring could have coped with such a task.

The Polynesians would probably have needed fixed-mast canoes to sail against the wind, which there is no evidence of, says Ian Goodwin from Macquarie University in Sydney, Australia. Instead, his research suggests that these pioneering sailors might have had the winds in their favour after all.

“All previous research that’s been done trying to understand this very rapid colonisation of the Pacific tried to grapple with the migration in terms of modern climate,” says Goodwin, who teamed up with anthropologist Atholl Andersonfrom the Australian National University in Canberra.

They wanted to see whether wind patterns could help explain the migrations. Using evidence from tree rings, lake sediments and ice cores, they tried to reconstruct ancient climates. Their work showed that, for a couple of centuries, a unique set of wind changes would have made these journeys easier.

Catching the breeze

The wind record reveals that every few decades there were dramatic shifts in wind direction, corresponding to expansions and contractions of the predominantly warm, moist climates of the tropical regions, caused by warming of the western Pacific Ocean. Many of these events explain the movements of Polynesians’ across the pacific.

From 1080 to 1100, the tropics contracted, moving the westerly winds further north. This would have created ideal sailing routes from the already colonised South Austral Islands to Easter Island – exactly when many archaeologists now think the island was colonised. Later, from 1140 to 1160, the opposite happened. The tropics expanded, and the easterly winds moved further south, allowing migration to New Zealand, which corresponds with archaeological and oral history records.

But the wind changes seem to have stopped as suddenly as they emerged – which could be why there don’t appear to have been any major voyages after 1300

Debating blows on

Terry Hunt, an anthropologist at the University of Oregon in the US, believes the timings are significant. He and his colleagues previously establishedexactly when some of the colonisations happened using radiocarbon dating. “When we wrote our paper, we were saying to ourselves ‘something must have erased distance in the rapid colonization of the remote Pacific.’ These windows may be the critical clue,” he says.

Dilys Johns from the University of Auckland, New Zealand, is more reserved about the role the wind played for the Polynesians’ rapid spread across the South Pacific. “It’s good to know they had chunks of time when it wouldn’t have been as difficult,” she says, but she still believes Polynesians were probably capable of sailing against the winds.

Hunt disagrees. “I think this is a compelling argument that an upwind capability was not necessary for long-distance voyaging, and indeed did not play a role.”

Journal Reference: PNAS, DOI: 10.1073/pnas.1408918111

Climate detectives reveal handprint of human caused climate change in Australia (Science Daily)

Date: September 29, 2014

Source: University of New South Wales

Summary: Australia’s hottest year on record in 2013 along with the accompanying droughts, heat waves and record-breaking seasons of that year was virtually impossible without the influence of human-caused global warming, scientists say.

The impacts of man-made climate change were felt in Australia during its hottest year on record in 2013. Credit: UNSW, P3, Helena Brusic.

Australia’s hottest year on record in 2013 along with the accompanying droughts, heat waves and record-breaking seasons of that year was virtually impossible without the influence of human-caused global warming.

New research from ARC Centre of Excellence for Climate System Science (ARCCSS) researchers and colleagues, over five different Australian papers in a special edition of the Bulletin of the American Meteorological Society (BAMS), has highlighted the powerful influence of global warming on Australia’s climate.

“We often talk about the fingerprint of human-caused climate change when we look at extreme weather patterns,” said Prof David Karoly, an ARCCSS researcher with the University of Melbourne.

“This research across four different papers goes well beyond that. If we were climate detectives then Australia’s hottest year on record in 2013 wasn’t just a smudged fingerprint at the scene of the crime, it was a clear and unequivocal handprint showing the impact of human caused global warming.”

In 2013, heat records fell like dominoes. Australia had its hottest day on record, its hottest month on record, its hottest summer on record, its hottest spring on record and then rounded it off with the hottest year on record.

According to the research papers presented in BAMS, the impact of climate change significantly increased the chances of record heat events in 2013. Looking back over the observational record the researchers found global warming over Australia (see attached graphic): doubled the chance of the most intense heat waves, tripled the likelihood of heatwave events, made extreme summer temperature across Australia five time more likely increased the chance of hot dry drought-like conditions seven times made hot spring temperatures across Australia 30 times more likely.

But perhaps most importantly, it showed the record hot year of 2013 across Australia was virtually impossible without the influence of human-caused global warming. At its most conservative, the science showed the heat of 2013 was made 2000 times more likely by global warming.

“When it comes to what helped cause our hottest year on record, human-caused climate change is no longer a prime suspect, it is the guilty party,” said ARCCSS Australian National University researcher Dr Sophie Lewis.

“Too often we talk about climate change impacts as if they are far in the future. This research shows they are here, now.”

The extreme year of 2013 is just the latest peak in a trend over the observational record that has seen increasing bushfire days, the record-breaking warming of oceans around Australia, the movement of tropical species into temperate zones and the shifting of rain bearing storm tracks further south and away from some of our most important agricultural zones.

“The most striking aspect of the extreme heat of 2013 and its impacts is that this is only at the very beginning of the time when we are expected to experience the first impacts of human-caused climate change,” said Dr Sarah Perkins an ARCCSS researcher with the University of New South Wales.

“If we continue to put carbon into our atmosphere at the currently accelerating rate, years like 2013 will quickly be considered normal and the impacts of future extremes will be well beyond anything modern society has experienced.”

Dolphins are attracted to magnets: Add dolphins to the list of magnetosensitive animals, French researchers say (Science Daily)

Date: September 29, 2014

Source: Springer Science+Business Media

Summary: Add dolphins to the list of magnetosensitive animals, French researchers say. Dolphins are indeed sensitive to magnetic stimuli, as they behave differently when swimming near magnetized objects.

Bottlenose dolphins (stock image). Credit: © sanilda / Fotolia

Add dolphins to the list of magnetosensitive animals, French researchers say. Dolphins are indeed sensitive to magnetic stimuli, as they behave differently when swimming near magnetized objects. So says Dorothee Kremers and her colleagues at Ethos unit of the Université de Rennes in France, in a study in Springer’s journalNaturwissenschaften — The Science of Nature. Their research, conducted in the delphinarium of Planète Sauvage in France, provides experimental behavioral proof that these marine animals are magnetoreceptive.

Magnetoreception implies the ability to perceive a magnetic field. It is supposed to play an important role in how some land and aquatic species orientate and navigate themselves. Some observations of the migration routes of free-ranging cetaceans, such as whales, dolphins and porpoises, and their stranding sites suggested that they may also be sensitive to geomagnetic fields.

Because experimental evidence in this regard has been lacking, Kremers and her colleagues set out to study the behavior of six bottlenose dolphins in the delphinarium of Planète Sauvage in Port-Saint-Père. This outdoor facility consists of four pools, covering 2,000 m² of water surface. They watched the animals’ spontaneous reaction to a barrel containing a strongly magnetized block or a demagnetized one. Except from this characteristic, the blocks were identical in form and density. The barrels were therefore indistinguishable as far as echolocation was concerned, the method by which dolphins locate objects by bouncing sound waves off them.

During the experimental sessions, the animals were free to swim in and out of the pool where the barrel was installed. All six dolphins were studied simultaneously, while all group members were free to interact at any time with the barrel during a given session. The person who was assigned the job to place the barrels in the pools did not know whether it was magnetized or not. This was also true for the person who analyzed the videos showing how the various dolphins reacted to the barrels.

The analyses of Ethos team revealed that the dolphins approached the barrel much faster when it contained a strongly magnetized block than when it contained a similar not magnetized one. However, the dolphins did not interact with both types of barrels differently. They may therefore have been more intrigued than physically drawn to the barrel with the magnetized block.

“Dolphins are able to discriminate between objects based on their magnetic properties, which is a prerequisite for magnetoreception-based navigation,” says Kremers. “Our results provide new, experimentally obtained evidence that cetaceans have a magenetic sense, and should therefore be added to the list of magnetosensitive species.”

Journal Reference:

  1. Dorothee Kremers, Juliana López Marulanda, Martine Hausberger, Alban Lemasson. Behavioural evidence of magnetoreception in dolphins: detection of experimental magnetic fields. Naturwissenschaften, 2014 DOI:10.1007/s00114-014-1231-x

Adding uncertainty to improve mathematical models (Science Daily)

Date: September 29, 2014

Source: Brown University

Summary: Mathematicians have introduced a new element of uncertainty into an equation used to describe the behavior of fluid flows. While being as certain as possible is generally the stock and trade of mathematics, the researchers hope this new formulation might ultimately lead to mathematical models that better reflect the inherent uncertainties of the natural world.

Burgers’ equation. Named for Johannes Martinus Burgers (1895–1981), the equation describes fluid flows, as when two air masses meet and create a front. A new development accounts for many more complexities and uncertainties, making predictions more robust, less sterile. Credit: Image courtesy of Brown University

Ironically, allowing uncertainty into a mathematical equation that models fluid flows makes the equation much more capable of correctly reflecting the natural world — like the formation, strength, and position of air masses and fronts in the atmosphere.

Mathematicians from Brown University have introduced a new element of uncertainty into an equation used to describe the behavior of fluid flows. While being as certain as possible is generally the stock and trade of mathematics, the researchers hope this new formulation might ultimately lead to mathematical models that better reflect the inherent uncertainties of the natural world.

The research, published in Proceedings of the Royal Society A, deals with Burgers’ equation, which is used to describe turbulence and shocks in fluid flows. The equation can be used, for example, to model the formation of a front when airflows run into each other in the atmosphere.

“Say you have a wave that’s moving very fast in the atmosphere,” said George Karniadakis, the Charles Pitts Robinson and John Palmer Barstow Professor of Applied Mathematics at Brown and senior author of the new research. “If the rest of the air in the domain is at rest, then flow one goes over the other. That creates a very stiff front or a shock, and that’s what Burgers’ equation describes.”

It does so, however, in what Karniadakis describes as “a very sterilized” way, meaning the flows are modeled in the absence of external influences.

For example, when modeling turbulence in the atmosphere, the equations don’t take into consideration the fact that the airflows are interacting not just with each other, but also with whatever terrain may be below — be it a mountain, a valley or a plain. In a general model designed to capture any random point of the atmosphere, it’s impossible to know what landforms might lie underneath. But the effects of whatever those landforms might be can still be accounted for in the equation by adding a new term — one that treats those effects as a “random forcing.”

In this latest research, Karniadakis and his colleagues showed that Burgers’ equation can indeed be solved in the presence of this additional random term. The new term produces a range of solutions that accounts for uncertain external conditions that could be acting on the model system.

The work is part of a larger effort and a burgeoning field in mathematics called uncertainty quantification (UQ). Karniadakis is leading a Multidisciplinary University Research Initiative centered at Brown to lay out the mathematical foundations of UQ.

“The general idea in UQ,” Karniadakis said, “is that when we model a system, we have to simplify it. When we simplify it, we throw out important degrees of freedom. So in UQ, we account for the fact that we committed a crime with our simplification and we try to reintroduce some of those degrees of freedom as a random forcing. It allows us to get more realism from our simulations and our predictions.”

Solving these equations is computationally expensive, and only in recent years has computing power reached a level that makes such calculations possible.

“This is something people have thought about for years,” Karniadakis said. “During my career, computing power has increased by a factor of a billion, so now we can think about harnessing that power.”

The aim, ultimately, is to make the mathematical models describing all kinds of phenomena — from atmospheric currents to the cardiovascular system to gene expression — that better reflect the uncertainties of the natural world.

Heyrim Cho and Daniele Venturi were co-authors on the paper.

Journal Reference:

  1. H. Cho, D. Venturi, G. E. Karniadakis. Statistical analysis and simulation of random shocks in stochastic Burgers equation. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2014; 470 (2171): 20140080 DOI: 10.1098/rspa.2014.0080