Thursday, December 31, 2009

No Último dia da Decada

O obrigatório Post de Fim de Ano.

Quem me conhece sabe que não desejo mal (por norma) a ninguém.

No entanto fica sempre bem desejar um Bom Fim de Ano e um excelente 2010 a todos. Espero que seja um ano marcante para todos (nem que seja pelo o número 2-0-1-0).
Para mim vai ser o ano que marca a passagem de uma vida académica que se tem pautado pela descontração do dia-a-dia, pela ausência de "alguma" responsabilidade, para provavelmente algo mais exigente. Será concerteza um ano interessante!

Acima de tudo divirtam-se, mas com juízinho!

Cumps

Tuesday, December 22, 2009

Responsibilities of 21st-Century Scientists

Acabei de receber um tweet do Biological Science (@BiolSciNews) sobre um texto com o título "Responsibilities of 21st-Century Scientist" escrito por Thomas E. Lovejoy (aqui).

Gostei de ler este texto, fala sobre a responsabilidade dos Ciêntistas saberem comunicar a ciência de forma simples para o público em geral e também de forma concisa e relevante para "decision makers"

Cito: "We certainly have a responsibility to share knowledge with public officials and other leaders. Otherwise how can we possibly expect policies that logically derive from the work? That requires very different language, i.e., simple and straightforward, whereas our normal implication is to present things with great complexity with all kinds of ifs, buts and maybes."

Outro ponto que achei interessante, e que é uma coisa a que, embora para mim seja uma questão de idoneidade e de etica pessoal para outros não representam nada, tenho prestado especial atenção depois de ler o livro "Bad Science" (Ben Goldacre) e de seguir os seus blogues e tweets. Refiro-me não só aos investigadores que se baseiam em falácias e em falsos estudos ou estudos mal-feitos , como também aos criticos crónicos de tudo e mais alguma.

Citando Lovejoy outra vez: "Almost all coverage helps. An exception is the deliberately incorrigible contrarian. In my view trying to address or correct their misstatements often draws more attention to them."

com votos que a Ciência seja mais transparente no ano 2010

Cumps

G

Friday, December 11, 2009

Hobbits reconhecidos como espécie humana

Afinal o Senhor dos Aneis não é apenas uma obra literária do Universo Fantástico. O senhor Tolkien acabou por descrever nos seus livros algo muito parecido com os Homo floresiensis. Deixo-vos com a transcrição do press-release que podem confirmar aqui!

"Hobbits" are a New Human Species - According to the Statistical Analysis of Fossils

Homo floresiensis Not Diseased Sub-Population of Healthy Humans

Researchers from Stony Brook University Medical Center in New York have confirmed that Homo floresiensis is a genuine ancient human species and not a descendant of healthy humans dwarfed by disease. Using statistical analysis on skeletal remains of a well-preserved female specimen, researchers determined the “hobbit” to be a distinct species and not a genetically flawed version of modern humans. Details of the study appear in the December issue of Significance, the magazine of the Royal Statistical Society, published by Wiley-Blackwell.

In 2003 Australian and Indonesian scientists discovered small-bodied, small-brained, hominin (human-like) fossils on the remote island of Flores in the Indonesian archipelago. This discovery of a new human species called Homo floresiensis has spawned much debate with some researchers claiming that the small creatures are really modern humans whose tiny head and brain are the result of a medical condition called microcephaly.

Researchers William Jungers, Ph.D., and Karen Baab, Ph.D. studied the skeletal remains of a female (LB1), nicknamed “Little Lady of Flores” or “Flo” to confirm the evolutionary path of the hobbit species. The specimen was remarkably complete and included skull, jaw, arms, legs, hands, and feet that provided researchers with integrated information from an individual fossil.

The cranial capacity of LB1 was just over 400 cm, making it more similar to the brains of a chimpanzee or bipedal “ape-men” of East and South Africa. The skull and jawbone features are much more primitive looking than any normal modern human. Statistical analysis of skull shapes show modern humans cluster together in one group, microcephalic humans in another and the hobbit along with ancient hominins in a third.

Due to the relative completeness of fossil remains for LB1, the scientists were able to reconstruct a reliable body design that was unlike any modern human. The thigh bone and shin bone of LB1 are much shorter than modern humans including Central African pygmies, South African KhoeSan (formerly known as ‘bushmen”) and “negrito” pygmies from the Andaman Islands and the Philippines. Some researchers speculate this could represent an evolutionary reversal correlated with “island dwarfing.” “It is difficult to believe an evolutionary change would lead to less economical movement,” said Dr. Jungers. “It makes little sense that this species re-evolved shorter thighs and legs because long hind limbs improve bipedal walking. We suspect that these are primitive retentions instead.”

Further analysis of the remains using a regression equation developed by Dr. Jungers indicates that LB1 was approximately 106 cm tall (3 feet, 6 inches)—far smaller than the modern pygmies whose adults grow to less than 150 cm (4 feet, 11 inches). A scatterplot depicts LB1 far outside the range of Southeast Asian and African pygmies in both absolute height and body mass indices. “Attempts to dismiss the hobbits as pathological people have failed repeatedly because the medical diagnoses of dwarfing syndromes and microcephaly bear no resemblance to the unique anatomy of Homo floresiensis,” noted Dr. Baab.

Full Citation: “The geometry of hobbits: Homo floresiensis and human evolution.” William Jungers and Karen Baab. Significance; Published Online: November 19, 2009 (DOI: 10.1111/j.1740-9713.2009.00389.x); Print Issue Date: December 2009.

Wednesday, December 09, 2009