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Scientific American - Objets Actus

Socializing with Youth Improves the Elderly's Health, Life Span
Mercredi 06 Août 2008 - 22:00 - 3 mois, 3 semaines depuis - Presse spécialisée - Scientific American
“Youth is a wonderful thing,” George Bernard Shaw once said. “What a crime to waste it on children.” Humor aside, recent research suggests that youthful energy may not be “wasted” after all. Through social interactions alone, the young can pass some of their vigor on to the elderly, improving the older generation’s cognitive abilities and vascular health and even increasing their life span.Although researchers have documented these benefits in mammals, such as rats, guinea pigs and nonhuman primates, the reason for the effect has remained unclear. Now biologist Chun-Fang Wu of the University of Iowa offers a genetic explanation in the May 27 issue of the Proceedings of the National Academy of Sciences. Wu and graduate student Hongyu Ruan found that the presence of youthful, active fruit flies doubled the life span of a group of flies with a mutation in Sod1, a gene that has been linked in humans to Alzheimer’s disease and amyotrophic lateral sclerosis (ALS), a motor-neuron disorder also known as Lou Gehrig’s disease. [More]

Ancient Bones Hold TB Clues
Mardi 05 Août 2008 - 22:01 - 3 mois, 3 semaines depuis - Presse spécialisée - Scientific American
[The following is an exact transcript of this podcast.] [More]

Congresswoman Slams Religious Right's Assault on Science's "Edgier" Side
Mardi 05 Août 2008 - 12:00 - 3 mois, 3 semaines depuis - Presse spécialisée - Scientific American
Six-term Democratic Congresswoman Diana DeGette owns a dubious distinction: She is one of the two co-authors of the bill that garnered President George W. Bush's first-ever veto.The subject of the legislation: embryonic stem cells. DeGette, who represents Colorado's 1st District--which includes Denver and its environs--is for them. The president isn't. [More]

Can Coal and Clean Air Coexist in China?
Lundi 04 Août 2008 - 10:10 - 3 mois, 4 semaines depuis - Presse spécialisée - Scientific American
CHONGQING--Coal powers China. In addition to producing about 75 percent of its electricity, the dirty, black rock is burned everywhere from industrial boilers to home stoves. More than 4,000 miners die every year digging up the fossil fuel, shortages abound forcing curbs in electricity use, and the country's transportation infrastructure creaks under the weight of distributing it across the country. [More]

Smoky Home: Cleaning Up Indoor Air with Human Waste
Lundi 04 Août 2008 - 10:08 - 3 mois, 4 semaines depuis - Presse spécialisée - Scientific American
LIMING, CHINA--Fourteen-year-old Feng Yu's parents used to have to carry as much as 66 pounds (30 kilograms) of wood daily to fuel the cooking stove in their kitchen. Although the old stove was in a separate building from the two-story wooden living quarters where she sleeps, its smoky smell still permeates its corner of the walled compound the family calls home and the walls are still blackened by years of smoke.View a Slide Show of a Chinese Biogas Home [More]

Beijing Olympics: BMX Bikers Search for Gold on Laoshan Mountain
Lundi 04 Août 2008 - 10:02 - 3 mois, 4 semaines depuis - Presse spécialisée - Scientific American
China's first-ever Olympic summer games also marks the first time bicycle motocross (BMX) athletes can go for the gold in the world's most prestigious athletic event. Forty-eight BMX cyclists--including four Americans--will bring the sport from its humble dirt track origins in Orange County, Calif., all the way to the Laoshan Mountain track in Beijing.BMX racing is different from other Olympic cycling events in several key ways: the races last less than a minute, the bikes are small and low to the ground, and the racers must wear protective gear over their faces, heads and joints to protect against likely collisions. It introduces an element of "extreme sports" to the summer games expected to appeal to younger viewers, much the way snowboarding did when it debuted in 1998 at the Nagano, Japan, Winter Olympics, according to Bob Tedesco, managing director of the National Bicycle League in Hilliard, Ohio. [More]

Loud Bar Equals More Beer
Dimanche 03 Août 2008 - 22:01 - 3 mois, 4 semaines depuis - Presse spécialisée - Scientific American
[More]

Incense May Act as a Psychoactive Drug during Religious Ceremony
Dimanche 03 Août 2008 - 22:00 - 3 mois, 4 semaines depuis - Presse spécialisée - Scientific American
Burning incense has accompanied religious ceremonies since ancient times. Its fragrant presence may be more than symbolic, however--a May 20 study in the FASEB journal suggests that a chemical commonly found in incense may elevate mood.Raphael Mechoulam of the Hebrew University of Jerusalem and his colleagues injected mice with incensole acetate, a component of the resin of the Boswellia plant. This resin, better known as frankincense, is an ingredient in Middle Eastern incense. The chemical reduced anxiety and depressive symptoms in the mice. In the anxiety test, for example, injected animals were less fearful of open spaces as compared with mice that were given a placebo. [More]

News Bytes of the Week: Large Hadron Collider gets its own rap song
Vendredi 01 Août 2008 - 15:00 - 4 mois depuis - Presse spécialisée - Scientific American
LHC gets its own rap song [More]

Camels Plagued by Parasites
Vendredi 01 Août 2008 - 14:00 - 4 mois depuis - Presse spécialisée - Scientific American
Camels are like edible cargo vans, as useful for their sturdy backs as for their milk and meat. But a new study by Iranian researchers suggests the health of that country's fleet is in jeopardy. [More]

Actus fournies par : Scientific American

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