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63,002 articles from ScienceDaily

• FRIDAY 17. APRIL, 2009
• 06:00 Oral Contraceptives Impair Muscle Gains In Young Women

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  Many active young women use oral contraceptives yet the effect on body composition and exercise performance has not been thoroughly studied. A new study finds that oral contraceptive use impairs muscle gains in young women, and is associated with lower hormone levels.  

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• 06:00 Smoke From Cigarettes, Cooking Oil, Wood, Shift Male Cardiovascular System Into Overdrive

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  Secondhand tobacco smoke and smoke from cooking oil and wood smoke affected cardiovascular function of men and women who were exposed to small doses of the smoke for as little as 10 minutes, according to a new study. The results confirm previous findings that tobacco smoke could possibly harm cardiovascular function.  

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• 06:00 Where 'Bad' Cholesterol Levels Are Controlled

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  Researchers have found that a protein responsible for regulating "bad" cholesterol in the blood works almost exclusively outside cells, providing clues for the development of therapies to block the protein's disruptive actions.  

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• 05:15 Carbon Nanotube Polymer Nanocomposites For Field Emission Cathodes

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  Scientists have discovered that you can produce a composite of carbon nanotubes embedded in a polymer that gives outstanding performance as an electron emitter material. Under high voltage these electrons strike a phosphor screen producing the familiar colours of red, green and blue and opens up the possibility of highly efficient large area field emission displays as well as possible uses as low power back lighting units in LCD televisions.  

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• 05:15 Digital Album Puts Focus On Kids' Health

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  Baby Steps is a multimedia system that combines sentimental snapping with medical record-keeping. The experimental product feels like a fun toy for parents, but researchers found in a pilot study that parents who used it regularly collected twice as much medically relevant information about their child's developmental progress.  

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• 05:15 Largest 17th Century Bead Repository Found In Coastal Georgia

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  Nearly 70,000 beads manufactured all over the world have been excavated at one of the Spanish empire's remotest outposts, the Santa Catalina de Guale Mission that is now part of St. Catherines Island, Georgia. The bead repository is the largest from Spanish Florida and enlightens archaeologists about past trade routes and social structure of the people that lived in the mission.  

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• 05:15 Genetic Risk Factors Play Role In Autoantibody-negative Rheumatoid Arthritis

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  During the past few years, several new genetic risk factors for rheumatoid arthritis (RA) have been identified. The majority of genetic risk factors identified so far have been associated with autoantibody-positive RA, which affects about two-thirds of RA patients, but distinguishing this variant from autoantibody-negative RA, which is less destructive, is considered increasingly important.  

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• 05:15 Mega-droughts In Sub-Saharan Africa Normal For Region: Droughts Likely To Worsen With Climate Change

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  Some droughts lasted centuries in the past, and a warming planet may make future droughts more devastating. A new study of lake sediments in Ghana suggests that severe droughts lasting several decades, even centuries, were the norm in West Africa over the past 3,000 years.  

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• 05:15 Some Orthodontic Appliances Are More Prone To Bacteria

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  Researchers have found that the majority of patients with self-ligating orthodontic brackets retain fewer bacteria in plaque than patients with elastomeric orthodontic brackets.  

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• 05:15 Chemists Uncover Green Catalysts For Industrial Chemical Processes

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  Scientists have discovered useful green catalysts made from iron that might replace the much more expensive and toxic platinum metals typically used in industrial chemical processes to produce drugs, flavors and fragrances.  

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• 05:15 Fear Of Moving Outdoors May Shackle An Older Person Home

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  Fear of moving about outdoors is very common among older people and increases the risk of developing self-reported difficulties in walking. New research shows that fear of moving around outdoors increases the risk developing difficulties in walking among physically fit older people living at home.  

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• 05:15 New Nucleotide In DNA Could Revolutionize Epigenetics

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  Anyone who studied a little genetics in high school has heard of adenine, thymine, guanine and cytosine -- the A,T,G and C that make up the DNA code. But those are not the whole story. The rise of epigenetics in the past decade has drawn attention to a fifth nucleotide, 5-methylcytosine, that sometimes replaces cytosine in the famous DNA double helix to regulate which genes are expressed. And now there's a sixth: 5-hydroxymethylcytosine. Biologists reveal an additional character in the mammalian DNA code, opening an entirely new front in epigenetic research.  

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• 05:15 Understanding Risk To Seattle's High-rise Buildings From A Giant Cascadian Earthquake

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  What is the risk to high-rise buildings in Seattle from a giant earthquake? The Cascadia subduction zone is likely to produce the strongest shaking experienced in the lower 48 states. Although seismic activity in the Pacific Northwest has been relatively low in the past two centuries, there is a growing consensus that this fault zone ruptures in giant earthquakes (magnitude exceeding 9); the last rupture is inferred to have occurred in 1700.  

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• 05:15 New Clues To How Stem Cells Form

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  A study on the nematode C. elegans shows some of the first direct evidence of a process required for epigenetic reprogramming between generations -- a finding that could shed more light on the mechanisms of fertilization, stem-cell formation and cloning.  

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• 05:15 More Intense Bladder Cancer Treatment Does Not Improve Survival, Study Finds

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  Despite enduring more invasive tests and medical procedures, patients who were treated aggressively for early stage bladder cancer had no better survival than patients who were treated less aggressively, according to a new study.  

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• 05:15 Safe Exercise For Migraine Sufferers

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  Many patients who suffer from migraines avoid taking aerobic exercise because they are afraid that the physical activity may bring on a serious migraine attack. Researchers have now developed an exercise program that can improve fitness among migraine sufferers without aggravating this painful condition.  

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• 05:15 NASA's Kepler Captures First Views Of Planet-Hunting Territory

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  NASA's Kepler mission has taken its first images of the star-rich sky where it will soon begin hunting for planets like Earth.  

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• 05:15 Protein That Concentrates Carbon Dioxide In Algae Identified

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  Researchers have identified one of the key proteins in microalgae responsible for concentrating and moving carbon dioxide into cells.  

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• 05:15 A Clock So Precise It Loses Only A Second Every 300 Million Years: Advance Uses Colliding Fermions

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  Physicists have measured and controlled seemingly forbidden collisions between neutral strontium atoms -- a class of antisocial atoms known as fermions that are not supposed to collide when in identical energy states. The advance makes possible a significant boost in the accuracy of atomic clocks based on hundreds or thousands of neutral atoms.  

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• 05:15 Uncovering Secrets Of Salmonella's Stealth Attack

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  A single crafty protein allows the deadly bacterium Salmonella enterica to both invade cells lining the intestine and hijack cellular functions to avoid destruction. This evolutionary slight-of-hand sheds new insights into the lethal tricks of Salmonella, which kills more than 2 million people a year.  

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• 05:15 High-dose Radiation Improves Lung Cancer Survival, Study Finds

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  Higher doses of radiation combined with chemotherapy improve survival in patients with stage III lung cancer, according to a new study.  

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• 05:15 Jet Lag Disturbs Sleep By Upsetting Internal Clocks In Two Neural Centers

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  New research shows the sleep disruption associated with jet lag and shift work occurs in two separate but linked groups of neurons below the hypothalamus at the base of the brain.  

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• 05:15 Computers 'Trained' To Analyze Fruit-fly Behavior

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  Scientists have trained computers to automatically analyze aggression and courtship in fruit flies, opening the way for researchers to perform large-scale, high-throughput screens for genes that control these innate behaviors. The program allows computers to examine half an hour of video footage of pairs of interacting flies in what is almost real time; characterizing the behavior of a new line of flies "by hand" might take a biologist more than 100 hours.  

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• 05:15 Hollow Mask Illusion Fails To Fool Schizophrenia Patients

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  Patients with schizophrenia are able to correctly see through an illusion known as the 'hollow mask' illusion, probably because their brain disconnects "what the eyes see" from what "the brain thinks it is seeing," according to researchers. The findings shed light on why cannabis users may also be less deceived by the illusion whilst on the drug.  

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• 05:15 Large Quantity Of Stem Cells Produced From Small Number Of Blood Stem Cells

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  Scientists have succeeded in producing a large quantity of laboratory stem cells from a small number of blood stem cells obtained from bone marrow. The team has thus taken a giant step towards the development of a revolutionary treatment based on these stem cells.  

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