Accueil | Fils de syndication

Scientific American - Objets Actus

Future of Popular Chinese Herbal Medicine Up in the Air [News]
Mercredi 09 Juillet 2008 - 14:00 - 4 mois, 3 semaines depuis - Presse spécialisée - Scientific American
DZATO, CHINA--It's a sight to behold on mornings in May and June: Hardy nomads and enterprising villagers from Nepal to western China spread out over the Tibetan Plateau and the Himalayas, pickaxes in tow, and ascend unforgiving peaks in the thin mountain air. Anyone who can make the journey goes--children, yak herders, pregnant women. By midday, the plateau is dotted with crouched forms combing the grass on their hands and knees. [More]

Ritalin Dose Changes Effect [60-Second Science]
Mercredi 09 Juillet 2008 - 08:04 - 4 mois, 3 semaines depuis - Presse spécialisée - Scientific American
[The following is an exact transcript of this podcast.]Doctors prescribe Ritalin to hyperactive kids to calm them down and increase their attention span. And college kids have taken to using Ritalin to concentrate when they hit the books. But it hasn’t been clear how the drug boosts focus. Now a paper in the journal Biological Psychiatry suggests how it might work. [More]

News Scan Briefs: Eating with Tension, Cancerous Marriage, Milk and Diabetes [Scientific American Magazine]
Mercredi 09 Juillet 2008 - 05:58 - 4 mois, 3 semaines depuis - Presse spécialisée - Scientific American
Eating with TensionThe long, thin beaks of shorebirds called phalaropes are no good at sucking up water and any tasty crustaceans within. Instead they rely on the attractive force of liquid known as surface tension to ferry prey upward. The birds first swim in small, fast circles on the surface of the water, creating a vortex that pulls creatures up within their reach. They next peck at the water and then rapidly open and close their beaks. This scissoring motion both pulls and squeezes droplets, about two millimeters in size, and moves them from the tip of their beaks into their mouths. In experiments with mechanical beaks, scientists at the Massachusetts Institute of Technology and the French National Center for Scientific Research find that the droplets do not move well if the water contains oil, detergents and other pollutants that alter water’s surface tension. Draw in the findings from the May 16 Science. [More]

World Wide Wellness: Online Database Keeps Tabs on Emerging Health Threats [News]
Mardi 08 Juillet 2008 - 12:30 - 4 mois, 3 semaines depuis - Presse spécialisée - Scientific American
News travels fast--especially online--and a group of scientists intends to put this to good use by monitoring and trying to stop infectious diseases in their tracks.Researchers at Children's Hospital Boston and Harvard Medical School have launched a data-mining project called HealthMap. This automated system scours news services and online discussion forums, pooling information about emerging health threats worldwide. [More]

Vaccinate Networks, Not Everyone [60-Second Science]
Dimanche 06 Juillet 2008 - 22:01 - 4 mois, 3 semaines depuis - Presse spécialisée - Scientific American
[The following is an exact transcript of this podcast.]You’ve probably heard of the whole six degrees of separation thing. It predicts that, on average, you’re no more than six links away from any other person on the planet. Like your roommate runs into a woman whose brother is a writer for Desperate Housewives. Which means you’re only six invites away from having lunch with Marcia Cross’s nannies. [More]

News Bytes of the Week--Making Beautiful Music: Why the Stradivarius Violin is Worth Millions [News]
Jeudi 03 Juillet 2008 - 12:00 - 5 mois depuis - Presse spécialisée - Scientific American
What makes the unique sound of a Stradivarius violin?The wood, of course. Using x-ray images taken from multiple different angles, radiologist Berend Stoel of Leiden University Medical Center in the Netherlands proved that the spruce and maple wood used in five violins made either by Antonio Stradivari or Giuseppe Guarneri del Gesù--the rival master luthiers of Cremona--had fewer variations in their density than that in seven contemporary violins. The density of the wood determines how a violin resonates with sound, which may explain why Stradivarius and Guarnerius violins are coveted by musicians worldwide and fetch prices of several million dollars. It may also allow modern instrument makers to finally match the perfection of past masters. [More]

Does Herpes Cause Brain Cancer? [News]
Jeudi 03 Juillet 2008 - 08:00 - 5 mois depuis - Presse spécialisée - Scientific American
Editor's Note: This story will be published in the next issue of Scientific American Mind.The deadliest and most common type of brain cancer has a strange bedfellow: cytomegalovirus, a kind of herpes present in about 80 percent of the U.S. population. Now scientists are exploiting this coincidence to treat the cancer with a vaccine that targets the virus and slows tumor regrowth. [More]

Can Bovine Growth Hormone Help Slow Global Warming? [News]
Mercredi 02 Juillet 2008 - 16:30 - 5 mois depuis - Presse spécialisée - Scientific American
Talk about milking an issue. Adding a new twist to the debate over the safety of hormones in milk, a new industry study concludes that injecting cows with a growth hormone known as recombinant bovine somatotropin (rbST) designed to increase their milk production is environmentally friendly. Why? Because it has the potential of reducing the number of greenhouse gas–emitting dairy cows on the planet without decreasing milk production. [More]

Winning the Tour de France Takes Grit, Strength--And Cutting-Edge Technology [News]
Mercredi 02 Juillet 2008 - 11:00 - 5 mois depuis - Presse spécialisée - Scientific American
To wear the winner's distinctive yellow jersey when this year's Tour de France ends in Paris on July 27, cyclists must make every second count throughout the race's 21 stages and 2,208 miles (3,554 kilometers). A bad day biking through the Alps can push a rider off the leader's list and deep into the pack, which makes access to the latest high-tech cycling equipment crucial.View slideshow [More]

Could Our Own Proteins Be Used to Help Us Fight Cancer? [Scientific American Magazine]
Mercredi 02 Juillet 2008 - 06:33 - 5 mois depuis - Presse spécialisée - Scientific American
In 1962 someone at the Genetics Institute in Pavia, Italy, turned up the temperature in an incubator holding fruit flies. When Ferruccio Ritossa, then a young geneticist, examined the cells of these “heat shocked” flies, he noticed that their chromosomes had puffed up at discrete locations. The puffy appearance was a known sign that genes were being activated in those regions to give rise to their encoded proteins, so those sites of activity became known as the heat shock loci.The effect was reproducible but initially considered to be unique to the fruit fly. It took another 15 years before the proteins generated when these chromosome puffs appear were detected in mammals and other forms of life. In what is certainly among the most absorbing stories in contemporary biology, heat shock proteins (HSPs) have since been recognized as occupying a central role in all life--not just at the level of cells but of organisms and whole populations. [More]

Actus fournies par : Scientific American

Ce site internet met des informations à votre disposition seulement et uniquement dans un but pédagogique. Elles ne peuvent en aucun cas remplacer la consultation d'un médecin ou les soins prodigués par un praticien qualifié et ne doivent par conséquent jamais être interprétés comme pouvant le faire.
Copyright © imedecin
Rental::Voyage::Annuaire web
Médecine et nouvelles technologies::Vidéos médecine::Forum santé

Accueil | Fils de syndication

imedecin.fr

Imedecin.com

Sites imedecin