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Scientific American - Objets Actus

Restoring Movement in Paralyzed Limbs
Lundi 20 Octobre 2008 - 10:40 - 1 mois depuis - Presse spécialisée - Scientific American
[Below is the original script. But a few changes may have been made during the recording of this audio podcast.] [More]

On the Web
Dimanche 19 Octobre 2008 - 22:00 - 1 mois depuis - Presse spécialisée - Scientific American
NewsThe Key to Smaller, More Powerful Gadgets [More]

Breaking Down Barriers in Science with Help from a Jellyfish: A Q&A with Martin Chalfie
Vendredi 17 Octobre 2008 - 15:00 - 1 mois depuis - Presse spécialisée - Scientific American
On October 8, Martin Chalfie, chairman of Columbia University's Department of Biological Sciences, got the call that every scientist wants to receive--only he slept right through it. The Nobel Foundation was ringing him at about 6 A.M. (in New York City) to let him know they had just awarded him, along Osamu Shimomura and Roger Tsien, this year's Nobel Prize in Chemistry for their work on green fluorescent protein (GFP). A few minutes after the phone stopped ringing, Chalfie logged onto the Nobel Foundation's Web site to see who they had honored this year, only to find himself in the winner's circle for a tool he had helped develop to let scientists illuminate and study living cells in real time.We sat down with Chalfie in his office on Columbia's campus to discuss the Nobel, GFP and his other research. [More]

Understanding Grief: When Time Doesn't Heal All Wounds
Jeudi 16 Octobre 2008 - 22:00 - 1 mois depuis - Presse spécialisée - Scientific American
Losing a loved one is always painful, but for most people time eventually heals the wounds. For about 10 to 20 percent of the bereaved, however, accepting and getting over a loss remains extremely difficult, even years later. Now researchers have come a step closer to elucidating the neurobiological underpinnings of this condition called complicated grief (CG). An August 15 functional MRI study in NeuroImage shows that in CG patients reminders of the deceased activate a brain area associated with reward processing, pleasure and addiction.A team led by Mary-Frances O’Connor of the University of California, Los Angeles, studied 23 women--11 of whom suffered from CG--who had lost a mother or sister to breast cancer in the past five years. While in the scanner, the women saw pictures and words that reminded them of their loved one. Brain networks associated with social pain became activated in all women, but in the CG patients reminders of the deceased also excited the nucleus accumbens, a forebrain area most commonly associated with reward. [More]

What are vestibular migraines?
Jeudi 16 Octobre 2008 - 15:20 - 1 mois depuis - Presse spécialisée - Scientific American
Pop singer and wardrobe malfunction poster girl Janet Jackson has been diagnosed with vestibular migraines, a rare form of headache that her publicist blames for her recently canceled "Rock Witchu" concerts. [More]

Elderly Web Surfers Benefit Brains
Mercredi 15 Octobre 2008 - 23:30 - 1 mois depuis - Presse spécialisée - Scientific American
[The following is an exact transcript of this podcast.]Senior citizens across the world love keeping their brains busy with crossword puzzles, sudoku or word jumbles. These brain-teasers actually help keep neurons firing clearly and quickly. Now a new study has a prescription for the Internet age. According to a paper to be released in an upcoming issue of the American Journal of Geriatric Psychiatry, surfing the web can improve brain function in older adults. [More]

Sewer Diving: A Journey Inside Milwaukee's Deep Water Tunnel
Mercredi 15 Octobre 2008 - 14:25 - 1 mois depuis - Presse spécialisée - Scientific American
Since 1994, a more than 26-mile- (42-kilometer-) long tunnel has been keeping Milwaukee's sewage from spilling into Lake Michigan. This deep water tunnel--a holding tank on steroids--comprises two legs roughly 300 feet (90 meters) belowground that can hold nearly 500 million gallons (1.9 billion liters) of sewage and storm water during a downpour. And for the last 14 years it has kept 74 billion gallons (280 billion liters) of wastewater out of Lake Michigan, according to Bill Graffin, a spokesman for the Milwaukee Metropolitan Sewerage District.That's a good thing, not only for water pollution but also for the drinking water plants that must pull H20 from the same lake and spend millions in money and energy cleaning it up. A breakdown in Milwaukee's clean water system in 1993 caused more than 100 deaths as a result of drinking water contaminated with cryptosporidium, a microbe which causes diarrhea, primarily in the young, elderly or infirm. [More]

Go Ahead, Say It: Shit--There, Now We Can Seriously Discuss Sanitation
Mercredi 15 Octobre 2008 - 11:00 - 1 mois depuis - Presse spécialisée - Scientific American
Sanitation doesn't get a lot of headlines but, all told, its absence kills 6,000 children a day, according to British charity Water Aid. And the solution chosen by the developed world--the flush toilet--is running up against limits in the amount of water available to flush away human waste. [More]

From Thrones to Robo-Commodes: The Pitfalls of Inventing a Better Toilet
Mercredi 15 Octobre 2008 - 11:00 - 1 mois depuis - Presse spécialisée - Scientific American
For a Q&A with Rose George, click here.The flush toilet is a curious object. It is the default method of excreta disposal in most of the industrialized, technologically advanced world. It was invented either 500 or 2,000 years ago, depending on opinion. The ancient inhabitants of the mighty Indus Valley, in present-day Pakistan, had privies above channels of running water, whereas King Minos's palace on Crete, 4,000 years ago, fed rainwater through terra-cotta pipes to flush privies below. Toilet historians, of which there are few, attribute the modern flush toilet to Sir John Harington, godson of Queen Elizabeth I, who thought his godmother might like something that flushed away her excreta and devised the Ajax, a play on the Elizabethan word "jakes", meaning privy. [More]

More Than Pickles and Ice Cream: The Link Between Diet and Fertility
Mercredi 15 Octobre 2008 - 04:00 - 1 mois, 1 semaine depuis - Presse spécialisée - Scientific American
Harvard School of Public Health epidemiologist Walter Willett talks to SciAm correspondent Cynthia Graber about his latest book, The Fertility Diet as well as about the links between nutrition and health generally. Plus, we'll test your knowledge of some recent science in the news.The text transcript is currently not available. Transcripts are posted about a week after the podcast airs. [More]

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