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Un big-bang du vivant
Vendredi 04 Janvier 2008 - 08:21 - 1 année depuis - 35 lectures - Presse généraliste - Nouvel Observateur Sciences
Il y a 600 millions d’années, juste avant le Cambrien, de multiples formes de vie pluricellulaires sont apparues comme en témoignent les fossiles d’Ediacara.

Les forêts nordiques absorbent moins de carbone
Jeudi 03 Janvier 2008 - 08:34 - 1 année depuis - 35 lectures - Presse généraliste - Nouvel Observateur Sciences
En raison d’automnes plus chauds la capacité d’absorption nette de carbone des écosystèmes nordiques est en baisse.

A Middle-Aged Man with Vesiculobullous Lesions on His Feet and Hands
Mercredi 19 Mars 2008 - 09:00 - 9 mois, 3 semaines depuis - 35 lectures - Presse spécialisée - Medscape HIV AIDS
A 57-year-old man presents to the ED with a 2-week history of vesiculobullous lesions on his feet and hands that have been increasing in size and number. The patient was previously given ointment to treat the lesions, with no effect. Fluid-filled vesicles ranging in size from 1 mm to 3 cm are present on the instep and plantar aspects of his feet, as well as on the palms of his hands and sides of the fingers. The lesions are nontender to palpation. What is the skin condition being described? eMedicine Case Presentations

Proceed With Caution: MRI Evaluation in Women With New Breast Cancer
Vendredi 13 Avril 2007 - 09:00 - 1 année, 9 mois depuis - 35 lectures - Presse spécialisée - Medscape family medicine
MRI of contralateral breast for those with unilateral breast cancer would lead to high rate of unnecessary biopsies. Adoption of accreditation and guidelines for this emerging technique are needed. Journal Watch

Calendar: Mind Events in October and November
Jeudi 02 Octobre 2008 - 22:00 - 3 mois depuis - 35 lectures - Presse spécialisée - Scientific American
OCTOBER12 Face your fears at Goose Bumps! The Science of Fear, a traveling exhibition developed by the California Science Center. Kids can experience the scary emotion in a safe environment as they learn how their brain and body work together to confront danger. Visit Boston’s Museum of Science to get your heart pumping in hands-on activities, including an interactive video game where the player learns how fear helps animals survive in nature. [More]

Cocaine Addiction Stems from Desire, Not the Drug
Jeudi 02 Octobre 2008 - 22:00 - 3 mois depuis - 35 lectures - Presse spécialisée - Scientific American
Scientists know that addictive drugs can mess with the brain’s circuitry and hijack its reward systems, but a July 31 rat study in the journal Neuron shows that psychological factors may be more instrumental in causing these changes than a drug’s chemical effects are. Cocaine use triggers long-lasting cellular memories in the brain, the study found--but only if the user consumes the drug voluntarily.A team led by Billy Chen and Antonello Bonci, both at the University of California, San Francisco, trained three groups of rats to press levers that delivered cocaine, food or sugar. The researchers injected cocaine into a fourth group. When they examined the rats’ brain tissue, they found an increase in synaptic strength within the reward center in those rats that had self-administered sugar, food or cocaine. These cellular memories were short-lived in the sugar and food groups, but in rats that had self-administered cocaine they persisted for up to three months after consumption had stopped. Most interestingly, the brains of rats that had consumed cocaine involuntarily did not show such imprints. [More]

Le papillon se souvient de sa vie de chenille
Lundi 17 Mars 2008 - 09:38 - 9 mois, 3 semaines depuis - 35 lectures - Presse généraliste - Nouvel Observateur Sciences
Une expérience originale prouve que les papillons conservent en mémoire certaines leçons apprises durant leur stade larvaire.

News: Megavoltage CT Imaging Unlocks Fossil Mysteries
Vendredi 01 Février 2008 - 11:00 - 11 mois, 1 semaine depuis - 35 lectures - Cancer - Scientific American
Using a novel radiotherapy technology called helical tomotherapy--in essence, the marriage of a computerized tomography (CT) scanner and a radiotherapy linear accelerator--James Welsh, associate professor of medical physics and human oncology at the University of Wisconsin School of Medicine and Public Health, and a group of colleagues have created images of fossil specimens of various types and ages.

Scientific American Body: 5 New Year's Resolutions You Owe Yourself
Jeudi 03 Janvier 2008 - 14:30 - 1 année depuis - 35 lectures - Presse spécialisée - Scientific American
On New Year’s Day more than a few of us annually resolve to change our lives--or at least our more self-indulgent habits. On the hunch that all good things flow from physical and mental well-being, Scientific American Body offers this list of recommended resolutions based on the advice of health professionals and the scientific literature. Whatever your goals, it will help you understand why hardly anything you could choose to do would have a bigger impact on your quality of life.

The burden of infectious diseases in Europe: a pilot study
Samedi 05 Janvier 2008 - 07:11 - 1 année depuis - 35 lectures - Presse spécialisée - Eurosurveillance
The main objectives of this pilot study were to test the potential use of the disease burden concept in the field of infectious diseases, including data quality and availability; to recommend future studies; and to stimulate a debate....

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