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Brasil perde Lattes
O físico Cesar Lattes, descobridor dos mésons pi e um dos brasileiros que mais próximo chegaram ao Prêmio Nobel, morreu nesta terça (8/3), em Campinas (SP), aos 80 anos. [+ leia mais]
Fonte: Fapesp
Hans Bethe Dies (1906-2005)
"Hans Bethe, a scrupulously open-minded Nobel Prize winner who was perhaps the last survivor of the scientific titans who created nuclear physics and nuclear weapons, died March 5 at his home in Ithaca, N.Y., near Cornell University. He was 98.
His wife, Rose, daughter of a famed German university professor, said he died of congestive heart failure.
Dr. Bethe Nobel Prize, awarded in 1967, came for work that stirred the imagination: He explained with pencil and paper how starlight is produced and what makes the sun shine.
What he described in detail in the 1930s were thermonuclear reactions of a kind that would later make possible the hydrogen bomb.
Dr. Bethe, a man viewed as a genius by colleagues and co-workers who were themselves regarded as among the most brilliant figures of their time, was also a principal figure in the development of the atom bomb, which ended World War II.
At Los Alamos, the secret New Mexico laboratory where the A-bomb was designed and built during the war, Dr. Bethe, esteemed for his knowledge and his reliability, was named to head the theoretical division.
After having met him in Europe as a young man, Edward Teller, known as the father of the hydrogen bomb, said Dr. Bethe had the most comprehensive knowledge of theoretical physics that I had ever encountered.
Among the luminaries of 20th-century physics, Dr. Bethe was acknowledged to be in the front rank, serving as teacher, colleague and friend, and as a beacon in some of the moral confusions that sometimes accompanied their accomplishments.
The celebrated Richard Feynman worked for him at Los Alamos and studied with him at Cornell. Dr. Bethe testified for J. Robert Oppenheimer, who headed the atom bomb project, at Oppenheimers security hearing; he gave a eulogy at Oppenheimers 1967 funeral.
A participant in the postwar public debate over weapons policy, he appeared able to take strong stands without alienating his friends on the other side, and without depriving them of credit for their abilities and achievements.
He was widely regarded as the conscience of the nuclear science community.
When he first spoke in favor of limits on bomb testing, his impeccable reputation gave immediate credibility to that position.
He was also considered one of the most persuasive opponents of many of the schemes proposed in the 1980s to provide a shield against nuclear-armed missiles.
Nuclear physics, which was to seize the popular imagination in the second half of the 20th century, was in its infancy in the 1930s, when Dr. Bethe, in a literal sense, wrote the book on it.
The three long articles he produced in the late 1930s were the definitive guide for those probing the mysteries of the field. The articles, taken together, were known familiarly as The Bethe Bible.
Like his wife, Hans Albrecht Bethe ( pronounced, BAY-tuh) was descended from an academic family. He was born July, 2, 1906, in Strasbourg, in Alsace-Lorraine, an area that had long been a zone of contention between France and Germany.
University professors had been in his family tree for generations. His father was a physiologist, and his mother and grandmother were professors children.
After a secondary education in Frankfurt, at a school named for the poet Goethe, Dr. Bethe went on to the University of Frankfurt and then obtained a PhD at the University of Munich. This degree was conferred in 1928, at the time when physics was in ferment over the development of quantum mechanics, a revolutionary way of describing nature at its most elemental levels.
Seizing upon the possibilities of this new doctrine, he applied it before the 1920s had ended to some of the perplexing problems of the behavior of electrons as they bounce around among the atoms making up crystals.
He taught physics in Frankfurt, then in Stuttgart. He lectured in Munich and worked under pioneering nuclear physicist Sir Ernest Rutherford at Britains Cambridge University. He also came in contact with Enrico Fermi and Niels Bohr, other figures from the physics pantheon.
His career appeared to reflect in part the academic inclinations of his ancestors. In the 1930s, another aspect of his ancestry helped determine the course of his life. Hitler was coming to power in Germany, and Dr. Bethes mother was Jewish.
By 1935 he was at Cornell, where he would remain for the next 70 years and which he would help to rapidly become one of the East Coasts centers of physics.
He was often described as careful, meticulous, methodical, even austere in his work habits. Colleagues said that he prepared his masterful summary of nuclear physics by sitting in a room at a desk.
At one end of his desk was a stack of blank paper. Hour by hour, day after day, he took a sheet from the stack, covered it with words and equations, and deposited it on the other end of the desk.
Thus was written the Bethe Bible, which appeared in a publication called the Reviews of Modern Physics.
Teller said it contained everything then known about nuclear physics -- which, he said, meant everything that Bethe knew.
About this time, Bethe and another scientist worked out in detail the process of nuclear fusion by which the sun generates its energy, producing heat and light.
He also elucidated a somewhat different mechanism by which some stars give their light. The multistage process known as the carbon cycle, required about six weeks for him to delineate. Although it has been said that many of his accomplishments merited it, this was the one that won him the Nobel Prize.
His students at Cornell recalled his patience, warmth and booming laugh. Not only that, but 70 years ago, nuclear scientists knew the delights of road trips.
In 1937, an important physics conference was being held at Stanford University. Teller and his wife went with Bethe and his spouse. According to Teller, we all piled into Hanss car and drove across the nation.
Dr. Bethe became an American citizen in 1941, and the next year was among the handful of top scientists invited by Oppenheimer to Berkeley, Calif., for discussions on designing an atomic bomb.
The fission bomb had to be done, Dr. Bethe later told a biographer, because the Germans were presumably doing it.
This led to the creation of Los Alamos, where Dr. Bethe, as head of the theoretical division, led some of the worlds best physicists in the complex calculations that were essential to building a workable bomb. Later, scientists would gather to watch him compete with Feynman in computation contests.
After the war, he returned to the academic world, appearing to hold the position that the bomb already built should be sufficient to maintain peace. He rejected Tellers early pleas to return to Los Alamos to work on the more powerful thermonuclear weapon.
Eventually, however, he did work on it, after being persuaded of its necessity. Once described as a dove, he told an interviewer, as quoted in a newspaper, that a better description would be a tough dove.
He sought to avoid taking what he perceived as extremist positions in the arms control debates of the 1950s, and, ever the pragmatist, worked to develop blast detection systems that could be used to enforce bans on testing. He saw possible value in the use of fission to generate electricity.
He served on the Presidents Science Advisory Committee from 1956 to 1964 and received the government|s Fermi Award.
Serene and energetic, he kept active as he grew older. At the age of 93, he gave three lectures to neighbors at an Ithaca retirement community. The topic was quantum theory.
In addition to his wife, survivors include two children. "
Colaborador: José Júlio Rozental
Fonte: Washington Post
New book from IAEA - Determination of Human Pathogen Profiles in Food by Quality Assured Microbial Assays TECDOC 1431
This publication includes the results of a Coordinated Research Project (CRP) on "Determination of Human Pathogen Profiles in Food by Quality Assured Microbial Assays". Major food microbial contaminants were identified in some of the main foods exported in the international food market. Thousands of samples in a wide variety of foods were selected to be studied during different points of the food chain: meat (chicken, beef and pork), seafood (shellfish such as shrimp, prawns, scampi, squid, and lobsters, and different types of fish such as salmon, cuttle fish, rohu, fin herring, catfish, milkfish, and tilapia), spices (pepper, paprika), frozen vegetables (asparagus, peas and corn) and other products (coconut and dairy products). The analysis included pathogenic bacteria such as Salmonella spp. (several serotypes), Escherichia coli, E. coli 0157:H7, Staphylococcus aureus, Clostridium perfringens, Bacillus cereus, Vibrio choleare, Vibrio parahaemolitycus and Yersinia enterolítica. This CRP produced useful data to conduct better risk assessments on food in importing as well as exporting countries. [+ leia mais]
Fonte: IAEA
New book from IAEA - Advances in Radiation Chemistry of Polymers TECDOC 1420
"The radiation chemistry of polymers is one of the most important fields in the sciences of radiation induced chemical and physical changes in materials. Polymers are the most often irradiated materials, those most often modified and the main component of radiation sterilized medical products. The changes in their structure may be either beneficial or undesirable. This is the reason why the R&D concerning these materials is broad and most developments concerning radiation processing are foreseen in this area. Different aspects of basic research and R&D were presented during the meeting on ""Advances in Radiation Chemistry of Polymers"" held at the Notre Dame Radiation Laboratory, University of Notre Dame, Indiana, USA, and this TECDOC contains the proceedings of this meeting. The leading experts in the field participated at the meeting, and the present status of the subject and the foreseen trends in it were discussed. Therefore this publication is the most up to date available on the subject. " [+ leia mais]
Fonte: IAEA
Dia Internacional da Mulher
"Estimados colegas da ABFM e SBPR,
08 de Marco dia Internacional da Mulher. Meu respeito a todas.
Friso o Prêmio que a UNESCO outorgou a Pesquisadora brasileira Belita Koiller por promover a participação da mulher na ciência.
Belita Koiller, bk@if.ufrj.br, professora titular de Física da Universidade Federal do Rio de Janeiro(UFRJ) e membro do Conselho Nacional de Desenvolvimento Científico do Brasil, é a primeira mulher, titular de Física, da Academia Brasileira de Ciências (ABC).
Ler artigo em portugues no site da ONU http://www.un.org/av/radio/portuguese/
Também destaco no ano internacional da fisica, a Dra.Elisa Baggio Saitovitch, que presidira a 2ª Conferência Internacional das Mulheres em Física - International Union of Pure and Applied Physics (IUPAP)
Veja nos site http://www-csnsm.in2p3.fr/nominatif/thibault/sfp/iupap-2005.pdf e no do Centro Brasileiro de Pesquisa em Física.
Elisa Baggio Saitovitch: Chair elisa@cbpf.br
Cita-se os e-mail das duas, caso desejarem algum contacto.
" [+ leia mais]
Colaborador: José Júlio Rozental
Consolidação feminina
Estudo Trajetória da Mulher na Educação Brasileira, lançado em Brasília, mostra o crescimento de matrículas do sexo feminino em todos os níveis de ensino. Na graduação e na pós elas já são maioria. [+ leia mais]
Fonte: Fapesp
Governo testará células em cardíacos
Ministério começa este mês a selecionar 1.200 voluntários para verificar eficácia e segurança de terapia com células-tronco adultas. [+ leia mais]
Fonte: Jornal da CIência
Gaúchos fazem cirurgia inédita com células-tronco
Equipe do hospital da PUC aplicou células de um paciente no nervo de seu antebraço. [+ leia mais]
Fonte: Jornal da Ciência
Grupos de pesquisa se animam para estudar embrião
"Cientistas de vários Estados afirmam que transição para novas células é viável, mas apontam incertezas. " [+ leia mais]
Fonte: Jornal da Ciência
Trio de genes facilita detecção de tumor
"Etiquetas moleculares que denunciam doença são primeiro fruto do Projeto Genoma Câncer, feito em São Paulo. " [+ leia mais]
Fonte: Jornal da Ciência
Encontro de mulheres - conclusões
Vejam as conclusões do Encontro de Mulheres (Resumo,Detalhe), realizado em 2004 no Rio de Janeiro. [+ leia mais]
Colaborador: Laura Furnari
Publicação de norma da ABNT
"Prezados(as) Senhores(as),
Informo que no mês de fevereiro de 2005 a ABNT publicou a seguinte Norma:
NBR IEC 60601-2-45:2005 - Equipamento eletromédico - Parte 2-45: Prescrições particulares para a segurança de equipamento de raios-X mamográfico e dispositivos de estereotaxia manográfica
Caso queiram adquirir a mesma, por favor entrem em contato com a própria ABNT através dos telefones 11-3767.3600.
Rita de Cássia Cação Lari
Chefe de Secretaria ABNT/CB-26
Assessora de Qualidade - ABIMO
" [+ leia mais]
Colaborador: Rita de Cássia Cação Lari
Fonte: ABIMO
Vitória da razão, editorial da Folha de SP, sobre a aprovação da Lei de Biossegurança
"O Brasil dá mais um passo para constituir-se na República moderna, aberta, pluralista e laica que deve ser. " [+ leia mais]
Fonte: Jornal da Ciência
Presente e futuro das células-tronco
"Especialistas esclarecem 12 questões sobre o que já se sabe e o que ainda é experimental nesta área. " [+ leia mais]
Fonte: Jornal da Ciência
Um dia após aprovação, Governo libera R$ 5 milhões para pesquisas
Cautelosos, cientistas alertam que ninguém será curado com a simples aprovação da medida e apontam um longo caminho. [+ leia mais]
Fonte: Jornal da Ciência
Aprovação da Lei de Biossegurança é elogiada por pesquisadores
"A geneticista Lygia da Veiga Pereira, professora do Instituto de Biociências da USP, considerou uma grande vitória a autorização para o uso de embriões em pesquisas contra doenças. " [+ leia mais]
Fonte: Jornal da Ciência
Brasileira recebe prêmio para mulheres cientistas na França
"A física brasileira Belita Koiller recebeu nesta quinta-feira em Paris um dos cinco prêmios concedidos pela Unesco e a empresa internacional de cosméticos L Oreal destinados a promover o papel da mulher na ciência " [+ leia mais]
Fonte: Jornal da Ciência
Ano Einstein reúne mais de 6.500 físicos em Berlim
"Mais de 6.500 físicos se reunem a partir desta sexta-feira, em Berlim, para analisar durante seis dias a física desde Einstein, no centenário da formulação da teoria da relatividade pelo cientista alemão Albert Einstein " [+ leia mais]
Fonte: Jornal da Ciência
Temperatura granular
Nem poderia ser diferente. O estudo de como medir a temperatura de grânulos de um objeto em movimento saiu publicado na edição especial da revista européia New Journal of Physics feita para homenagear os cem anos dos trabalhos revolucionários do físico Albert Einstein. [+ leia mais]
Fonte: Fapesp
Uerj oferece workshop sobre radioterapia
"O Laboratório de Ciências Radiológicas da UERJ (LCR) está com inscrições abertas para o workshop Aquisição de Dados, Comissionamento e Garantia de Qualidade nos Sistemas de Planejamento na Radioterapia. " [+ leia mais]
Fonte: Jornal da Ciência
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