Minggu, 27 Maret 2011

ScienceDaily Top Science Headlines

for Sunday, March 27, 2011

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Antarctic icebergs play a previously unknown role in global carbon cycle, climate (March 26, 2011) -- In a finding that has global implications for climate research, scientists have discovered that when icebergs cool and dilute the seas through which they pass for days, they also raise chlorophyll levels in the water that may in turn increase carbon dioxide absorption in the Southern Ocean. ... > full story

Living at high altitude reduces risk of dying from heart disease: Low oxygen may spur genes to create blood vessels (March 26, 2011) -- Researchers have found that people living at higher altitudes have a lower chance of dying from heart disease and live longer. ... > full story

New instrument keeps an 'eye' on nanoparticles (March 26, 2011) -- Scientists have developed a new instrument capable of detecting individual nanoparticles with diameters as small as a few tens of nanometers. ... > full story

Supervised weight training safe for pregnant women, study suggests (March 26, 2011) -- Despite decades of doctors' reluctance to recommend weight training to pregnant women, a new study has found that a supervised, low-to-moderate intensity program is safe and beneficial. ... > full story

Maquipucuna cloud forest in Ecuador yields new species of yeast (March 26, 2011) -- A new species of yeast has been discovered growing on the fruit of an unidentified and innocuous bramble collected from the biodiversity-rich Maquipucuna cloud forest nature reserve, near Quito, in Ecuador. ... > full story

Tourettes brains are structured for greater, not lesser, cognitive motor control (March 26, 2011) -- Contrary to intuition, people who suffer from the motor and vocal tics characteristic of Tourette syndrome actually perform behavioral tests of cognitive motor control more accurately and quickly than their typically developing peers do. According to a new study, that enhanced control arises from structural and functional changes in the brain that likely come about from the need to constantly suppress tics. ... > full story

Algae, bacteria hogged oxygen after ancient mass extinction, slowed marine life recovery (March 26, 2011) -- After the biggest mass extinction in Earth's history -- 250 million years ago -- algae and bacteria in the ocean rebounded so fast that they consumed virtually all the oxygen in the sea, slowing the recovery of the rest of marine animals for several million years. ... > full story

Neuroscientists decode crucial component in brain signal processing (March 26, 2011) -- A team of Neuroscientists from NeuroCure Cluster of Excellence at Charité – Universitätsmedizin Berlin and Baylor College of Medicine in Houston, Texas, have made a major breakthrough in understanding how signals are processed in the human brain. ... > full story

Bats keep separate households (March 26, 2011) -- The use of different environments by males and females in the parti-colored bat makes population estimation and thereby the conservation of the species more difficult. The use of different resources by males and females exacerbates the estimation of population sizes. However, the monitoring of population sizes, particularly for rare and threatened species, is pivotal to quick and effective conservation action. Scientists have now investigated the ecological niches of male and female parti-colored bats (Vespertilio murinus) and found out that the sexes use entirely different foraging grounds. With their results they can show that a finer grained view of what different demographic subsets of species do is essential for correct estimation of population trends with important implications on action plans for conservation. ... > full story

HIV integration requires use of a host DNA-repair pathway (March 26, 2011) -- The human immunodeficiency virus, the cause of AIDS, makes use of the base excision repair pathway when inserting its DNA into the host-cell genome, according to a new study. The research shows that crippling the repair pathway prevents the virus from completing this critical step in its life cycle. The findings offer potential new targets for novel anti-HIV drugs that may not lead as quickly to viral resistance as current drugs, the researchers say. ... > full story

Inclusive fitness theory defended (March 26, 2011) -- In 1964, biologist William Hamilton introduced Inclusive Fitness Theory to predict and explain phenomena ranging from animal behavior to patterns of gene expression. With its many successes, the theory became a cornerstone for modern biology. In August 2010, researchers challenged the theory in the journal Nature. Now Nature has published sharp rebuttals from scores of scientists. ... > full story

'Simulated' needles just as effective as real acupuncture in treating nausea in cancer patients, study finds (March 26, 2011) -- Simulated acupuncture -- sometimes referred to as placebo -- is just as beneficial as real acupuncture for treating nausea in cancer patients undergoing radiotherapy, according to a study by researchers in Sweden. Patients, who received only standard care including medications for nausea, felt significant more nausea than patients in both the acupuncture groups. ... > full story

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