Abundant tiny particles of diamond dust exist in sediments dating to 12,900 years ago at six North American sites, adding strong evidence for Earth’s impact with a rare swarm of carbon-and-water-rich comets or carbonaceous chondrites, scientists report. The discoveries are consistent with theory of Clovis-age disruption by a cosmic event, according to researchers.
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Clinical data links oral bisphosphonates to increased jaw necrosis. The study is among the first to acknowledge that even short-term use of common oral osteoporosis drugs may leave the jaw vulnerable to devastating necrosis. Fosomax is the most widely prescribed oral bisphosphonate.
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Researchers in Germany are reporting an advance toward development of technology that could make life easier for millions of people allergic to plant pollen. It could underpin the first automated, real-time systems for identifying specific kinds of allergy-inducing plant pollen circulating in the air.
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Throughout the world, 10 million breast cancer survivors have a lifetime risk for developing lymphedema, a chronic condition that involves swelling of the limbs and impacts physical and psychosocial health. In a new study, researchers found that the risk of developing lymphedema is 40 percent to 60 percent higher in women with body mass index [...]
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Scientists have determined the structure of a third subtype of botulinum neurotoxin — a deadly toxin that causes the disease botulism, and is also used in cosmetic and therapeutic applications. The structure reveals a unique arrangement of the active components that may help explain why subtype E is faster-acting than others — and may have [...]
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Modern humans left Africa over 60,000 years ago in a migration that many believe was responsible for nearly all of the human population that exist outside Africa today.
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Scientists reveal for the first time the 3-D character of DNA nanotubules, rings and spirals, each a few hundred thousandths the diameter of a human hair. These DNA nanotubes and other synthetic nanostructures may soon find their way into a new generation of ultra-tiny electronic and biomedical innovations.
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Alpha-synuclein is the main component of Lewy bodies, the clumps of aggregated proteins that form in the brains of Parkinson’s disease patients. The alpha-synuclein gene is mutated or triplicated in some cases of inherited Parkinson’s. A process called chaperone-mediated autophagy (CMA) plays an important role in recycling of specific proteins in brain cells. Alpha-synuclein disrupts [...]
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Scientists have reconstructed the pattern of droughts in Spain between 1506 and 1900 on the basis of ceremonial records held at the Cathedral of Toledo, in order to observe how droughts have varied over the past 500 years. Short-term meteorological data and tree growth rings have also been used to supplement the records of ceremonies.
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Levels of two proteins in a woman’s ovarian cancer are strongly associated with her likelihood of survival, a research team reports
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