ScienceDaily Top Science Headlines
for Sunday, February 7, 2010
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Scientists demonstrate world's fastest graphene transistor; holds promise for improving performance of transistors (February 7, 2010) -- IBM researchers have demonstrated a radio-frequency graphene transistor with the highest cut-off frequency achieved so far for any graphene device -- 100 billion cycles/second (100 GigaHertz). The high frequency record was achieved using wafer-scale, epitaxially grown graphene using processing technology compatible to that used in advanced silicon device fabrication. ... > full story
New compound could become important new antidepressant (February 7, 2010) -- Chemists have discovered and synthesized a new compound that in laboratory and animal tests appears to be similar to, but may have advantages over one of the most important antidepressant medications in the world. ... > full story
First discovery of the female sex hormone progesterone in a plant (February 7, 2010) -- In a finding that overturns conventional wisdom, scientists are reporting the first discovery of the female sex hormone progesterone in a plant. Until now, scientists thought that only animals could make progesterone. A steroid hormone secreted by the ovaries, progesterone prepares the uterus for pregnancy and maintains pregnancy. ... > full story
Biologists determine microRNA activity is suppressed in mouse ovum (February 7, 2010) -- Scientists studying RNA activity, the so-called dark matter of the biological world, may have found the first event in reprogramming a differentiated oocyte into pluripotent blastomeres of the embryo. ... > full story
Sunny Record: Breakthrough for Hybrid Solar Cells (February 7, 2010) -- Scientists in Germany have succeeded in developing a method for treating the surface of nanoparticles which greatly improves the efficiency of organic solar cells. The researchers were able to attain an efficiency of 2 percent by using so-called quantum dots composed of cadmium selenide. These measurements, well above the previous efficiency ratings of 1 to 1.8 percent, were confirmed. ... > full story
Early abuse tied to more depression in children (February 7, 2010) -- A study of 500 low-income children ages 7 to 13, about half of whom had been abused and/or neglected, aimed to find out whether abuse early in life and feelings of depression affected cortisol ("stress hormone") levels. Study results suggest that there are different subtypes of depression, with atypical cortisol regulation occurring among children who were abused before age 5. ... > full story
How the butterflies got their spots (February 6, 2010) -- How two butterfly species have evolved exactly the same striking wing color and pattern has intrigued biologists since Darwin's day. Now, scientists have found "hot spots" in the butterflies' genes that they believe will explain one of the most extraordinary examples of mimicry in the natural world. ... > full story
New malaria vaccine is safe and protective in children, scientists find (February 6, 2010) -- A new vaccine to prevent the deadly malaria infection has shown promise to protect the most vulnerable patients -- young children -- against the disease, according to an international team of researchers. The vaccine seems to replicate in children the natural protective immunity that adults develop after years of intense exposure to malaria. A child dies of malaria every 30 seconds, according to the WHO. ... > full story
Toward safer plastics that lock in potentially harmful plasticizers (February 6, 2010) -- Scientists have published the first report on a new way of preventing potentially harmful plasticizers -- the source of long-standing human health concerns -- from migrating from one of the most widely used groups of plastics. ... > full story
How progesterone prevents preterm birth (February 6, 2010) -- Researchers believe they may have discovered how the hormone progesterone acts to prevent preterm birth. ... > full story
Secrets to superb malting barleys explored (February 6, 2010) -- Agricultural scientists are discovering more about what goes on inside malting barley grains as they germinate, or sprout, in the malt house. ... > full story
Moms' depression in pregnancy tied to antisocial behavior in teens (February 6, 2010) -- Researchers studying 120 British youth from inner-city areas found that mothers who became depressed when pregnant were four times as likely to have children who were violent at 16. This was true for both boys and girls. The mothers' depression, in turn, was predicted by their own aggressive and disruptive behavior as teens. ... > full story
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