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Scientists from the Howard Hughes Medical Institute and their colleagues have unraveled some of the fundamental mysteries about the genetic mechanisms that endow the immune system with its life-saving ability to generate specialized antibodies.
Without genetic fine-tuning, antibodies would be relatively ineffective in finding a good match on the surface of viruses, parasites, and other potentially dangerous foreign pathogens. The findings also reveal the workings of a gene mutation process
New study results demonstrate why caffeine and ephedra may provide a “final boost”
After Baltimore Orioles pitcher Steve Bechler died during spring training earlier this year, the spotlight again turned on the dietary supplement ephedra. The Chinese herb, used for asthma in the 1960s, is attractive to athletes, because it provides and energy “boost” during games, and offers pound-dropping qualities (an attraction for Bechler, who was ten pounds overweight).
Ephedra has been
New study results offer potential explanation of complications from birth control pills
When women think about birth control, estrogen, and cardiovascular risk, they often assume that there are no answers. They would appear to be correct.
On the one hand, new pharmacological advancements have provided combination oral contraceptive (OC) formulations with lower-dose estrogen. These formulations have significantly less risk of cardiovascular adverse events compared to the olde
On 30 June 1908, the seemingly endless forests of Siberia received an unwelcome and unexpected visit by an intruder from deep space. As it plunged headlong through the Earth’s atmosphere, the incoming asteroid exploded a few miles above the tree tops, flattening the forest over an area about 50 km (30 miles) in diameter. If the 60 metre (200 ft) wide chunk of rock had arrived a few hours later, it could have destroyed a city the size of London or Paris.
Exactly how many of these threatening
Retinal abnormalities in older people without diabetes are related to hypertension. Higher blood and pulse pressure are also associated with an increased incidence of macular abnormalities, including wet and dry age-related macular degeneration (AMD). These are the major findings of two studies appearing in the April issue of Ophthalmology, the clinical journal of the American Academy of Ophthalmology, the Eye M.D. Association.
The first study, assessing more than 2,000 men and women without