زيست پويا /zistpooya

Researchers Use Multiphoton Microscopy To Watch Chromosomes In Action (September 28, 2006) - Feverish fruit fly larvae, warmed in a toasty lab chamber, are giving Cornell researchers a way to watch chromosomes in action and actually see how genes are expressed in living tissue. > full story

Study Explains Peaks And Troughs Of Dengue Epidemics (September 28, 2006) - Scientists have long known that epidemics of dengue fever wax and wane over a period of several years, but they've never been quite sure why. With the incidence and range of the potentially deadly mosquito-borne illness increasing, understanding the factors that influence these epidemics has never been more important. A new study by researchers at the University of Georgia suggests that a brief period of cross-immunity conferred by any one of the four viral strains, or serotypes, that cause dengue explains the timing of epidemics. > full story

Groundwork Laid For Everglades Restoration, But Projects Experiencing Delays (September 28, 2006) - Progress has been made in developing the scientific basis and management structures needed to support a massive effort to restore the Florida Everglades ecosystem, but some projects important to the restoration have experienced troubling delays, says a new report from the National Research Council. The report outlines an alternative approach that can help the initiative move forward even as it resolves remaining scientific uncertainties. > full story

Most Widely Used Organic Pesticide Requires Help To Kill (September 27, 2006) - The world's most widely used organic insecticide, a plucky bacterium known as Bacillus thuringiensis or Bt for short, requires the assistance of other microbes to perform its insect-slaying work, a new study has found. > full story

Safer Than Sun, More Natural Looking Than Sunless Tanners: Topical Treatment May Be The Next Advance In Tanning (September 27, 2006) - An organic compound that creates a realistic beachy glow while inducing a natural sun block effect in your skin may be just around the corner, as scientists at the University of Kentucky are testing a treatment that enhances melanin production in animal models. > full story

Meteorites Record Past Solar Activity (September 27, 2006) - Ilya Usoskin (Sodankylä Geophysical Observatory, University of Oulu, Finland) and his colleagues have investigated the solar activity over the past centuries. Their study is to be published this week in Astronomy & Astrophysics Letters. They compare the amount of Titanium 44 in 19 meteorites that have fallen to the Earth over the past 240 years. Their work confirms that the solar activity has increased strongly during the 20th century. They also find that the Sun has been particularly active in the past few decades. > full story

Assessing Hidden Particles In The Air That We Breathe (September 27, 2006) - Scientists at the University of Hertfordshire are assessing 'hidden' particles in the air that we breathe and are developing methods to measure them. According to Professor Ranjeet Sokhi, Head of the University's Atmospheric Science Research Group (ASRG), current assessment methods for predicting air particles have not fully taken into account certain categories of air particles which do not come from vehicle exhausts. These include those from worn tyres, brakes and road surfaces. As a result current predictions of air pollution can be inaccurate. > full story

Satellites Reveal That Green Means Rain In Africa (September 27, 2006) - Scientists from the NERC-funded Climate and Land Surface Interactions Centre (CLASSIC) have found that the presence of green vegetation has a major influence on the amount of rain that falls in the Sahel region of Africa, south of the Sahara desert. Rains at the start of the growing season cause vegetation growth. This encourages a feedback loop as the greener the vegetation becomes, the greater the amount of rain that falls. > full story

Bird Flu Vaccine Additive May Stretch Supply (September 27, 2006) - Researchers have achieved an effective immune response to an avian influenza vaccine with doses as low as one-quarter of the norm when they added a chemical mixture known as MF59. The research is published in the November 1 issue of Clinical Infectious Diseases, now available online. > full story

Solar Flares Could Seriously Disrupt GPS Receivers (September 27, 2006) - A minor solar flare in September 2005 produced a noticeable degradation of all GPS signals on the day side of the Earth. When scaled up to the larger solar flares expected in 2011-12, Cornell researchers expect massive outages of all GPS receivers on the day side of the Earth. > full story

NASA Technology Captures Massive Hurricane Waves (September 27, 2006) - NASA research is helping to increase knowledge about the behavior of hurricane waves. The NASA Scanning Radar Altimeter (SRA), designed to take measurements of the changing wave height and structure in and around hurricanes, flew through many storms on a National Oceanic and Atmospheric Administration (NOAA) WP-3D aircraft from 1998-2005. It captured unprecedented details on wave behavior that are helping improve sea height forecasts. > full story

Scientists Document Warm Water Surging Into Arctic (September 27, 2006) - Scientists at the University of Alaska Fairbanks International Arctic Research Center this fall documented that recent surges of warm water from the North Atlantic Ocean continue to pulse into the Arctic Ocean and are moving toward Alaska and the Canadian Basin. > full story

Mind The Gap: Space Scientists Uncover Causes Of Gap In Van Allen Belts (September 27, 2006) - A team of British and U.S. scientists have discovered that the gap in the Van Allen radiation belts is formed by natural wave turbulence in space, not by lightning. The discovery settles years of controversy among space scientists about the mechanisms responsible for causing the gap and has important implications for space weather forecasting. > full story

Solvent Exposure Linked To Birth Defects In Babies Of Male Painters (September 27, 2006) - Men who paint for a living may be placing their unborn children at increased risk of birth defects and low birth weight. > full story

Researchers Help Take Natural Gas Out Of Ethanol Production (September 27, 2006) - Iowa State University researchers are working with an Iowa company to replace the natural gas burned to make ethanol with a renewable gas made from biomass. > full story

Discovering How River Water Is Mixed Into The Sea Can Assist In Mapping Climate Change (September 27, 2006) - A study of the freshwater that flows into Liverpool Bay from the region's two main rivers is to help scientists piece together another part of the climate change 'map'. Scientist from the University of Wales, Bangor and Proudman Oceanographic Labs., Liverpool will be looking at how freshwater from the Mersey and Dee rivers mixes with the sea water in Liverpool Bay. > full story

World's Largest Scientific Computing Grid Sustains A Million Jobs Per Month (September 27, 2006) - A milestone for scientific Grid computing was announced recently at the launch of EGEE'06, a major conference on scientific Grids hosted by CERN and held in Geneva this week. The Enabling Grids for E-sciencE (EGEE) project maintains a global Grid infrastructure that has been able to sustain more than 30,000 jobs a day -- over a million per month -- for a period of six months this year. > full story

Wild Lions Develop Manes In Accordance With Local Climate Regimes (September 26, 2006) - An article appearing in the current issue of the Journal of Zoology sheds light on several longstanding misconceptions regarding the controversial topic of mane variability among wild lions. This comprehensive scientific assessment of mane variation -- including "manelessness" -- is a first and took nearly seven years to complete. According to the overall findings of the study, wild lions generally develop manes in accordance with local climate regimes. > full story

No Laughing Matter: Reducing Levels Of Nitrous Oxide From Soil To Lessen Impact Of Global Warming (September 26, 2006) - Abertay University is supporting the University of Plymouth in a £1 million project which could reduce the impact of global warming by decreasing the levels of nitrous oxide -- 'laughing gas' -- produced by the earth's soil. > full story

MIT Finds Most Complex Protein Knot Ever Seen (September 26, 2006) - An MIT team has discovered the most complicated knot ever seen in a protein, and they believe it may be linked to the protein's function as a rescue agent for proteins marked for destruction. > full story

Jumping Gene Could Provide Non-viral Alternative For Gene Therapy (September 26, 2006) - A jumping gene first identified in a cabbage-eating moth may one day provide a safer, target-specific alternative to viruses for gene therapy, researchers say. They compared the ability of the four best-characterized jumping genes, or transposons, to insert themselves into a cell's DNA and produce a desired change, such as making the cell resistant to damage from radiation therapy. > full story

NASA Study Finds World Warmth Edging Ancient Levels (September 26, 2006) - A new study by NASA climatologists finds that the world's temperature is reaching a level that has not been seen in thousands of years. > full story

Better Sludge Through Metagenomics (September 26, 2006) - Researchers from the U.S. Department of Energy Joint Genome Institute (DOE JGI) and collaborators at the University of Wisconsin, Madison, and the Advanced Wastewater Management Centre, University of Queensland, Australia, have published the first metagenomic study of an activated sludge wastewater treatment process. The research provides a blueprint of the genes and hence the metabolic possibilities of the wastewater environment, a view to understand how the system works and predicting and averting failures or crashes. > full story

How Butterflies Got Their Spots: A 'Supergene' Controls Wing Pattern Diversity (September 26, 2006) - In an intriguing example of adaptive evolution, genetic linkage analysis identifies a conserved region in distantly related Heliconius butterfly species that controls the diverse effects of wing patterning and mimicry. > full story