The Sagan criteria for life revisited
... shine ultraviolet light on them, the same type of radiation put out by nearby stars and re-radiated by glowing hydrogen gases. Because of the extreme conditions, the likelihood of more complex, biologically useful molecules being formed seemed as remote as space itself. Instead, about 10 percent of the PAH...Jet Stream Studied In West African Drought
... The Penn State researchers also looked at the radiation emitted fromclouds to see if there was a difference seen in radiation during dry years. "If less radiation is emitted, it may indicate that there was moreconvect...Massive pollution documented over Indian Ocean
...ists. "Aerosols affect the amount of solar radiation that is absorbed andreflected back to space by the...on of clouds, thereby altering the amount of solar radiation theyabsorb and reflect back to space. Aerosol - cloud - radiation processes arehighly complex and n...Jefferson scientists detail mechanisms of programmed cell death
... andsometimes during irreversible cell injury from radiation and other poisons.Scientists believe apoptosis gone awry underlies neurodegenerative diseases suchas Alzheimer's and Parkinson's diseases, autoimmune diseases such as lupus, andcancer. Apoptosis has received a great deal of attention in the ...Dinosaur fossils reveal evolution's big picture, says Paul Sereno
...Sereno, who is from the University of Chicago. The radiation of new dinosaur species was a spectacular and long-lastingsuccess. In fact, during the Mesozoic era (248 to 65 million years ago), all theland animals more than one meter long were dinosaurs. The only other group ofanimals to dominate their ecosystem...Technotes -- Pacific Northwest National Laboratory's summer news tipsheet
...Northwest researchers have developed an innovative radiation sensorcomprised of lightweight, flexible glass fibers that provides portable,real-time measurements of neutrons and gamma rays. Called PUMA for plutoniummeasurement and analysis, the sensor can be embedded in a variety of materialsor literally wrapp...NCAR scientists seek clues to wildfires during Alaska prescribed burn
...efingers' become more important," says Radke. Both radiation and the convection that results from fire-atmosphereinteractions affect fire spread. To understand those effects, the teammust first see how fire fronts lap at, or "finger," unburned fuel. TheNCAR researchers are eager to observe more high-intensity ...Blocking VEGF can enhance radiation therapy
...can dramaticallyincrease the anti-tumor effects of radiation therapy report medical researchersfrom the Univers...Ralph Weichselbaum, M.D.,professor and chairman of radiation oncology at the University of Chicago anddirector of the study. "But we have long been certain," he ...Pacific Northwest developments earn spots in top 100 list
... fuel cells for automobiles better radiation monitoring enhanced scientific measuremen...The fibers emit light toindicate various levels of radiation and can be embedded in a variety ofmaterials or wrapped around objects of various shapes to analyze ......nding by definitively establishing how ultraviolet radiation causes geneticmutation in a common bacteria. The resolution is a surprise. While radiation is the stimulus, the group found,most of the resulting mutations are self-inflicted wounds, caused b...Sandia-developed remote sensor expected to analyze gases up to two miles away
...lysis technique,correlation spectroscopy. Infrared radiation is passed through a sample gas thatimparts a spectral pattern to the radiation. This pattern is then correlatedwith the spectrum of a reference gas to provide the identification. Each gas hasits own distinct spectral pattern, which can be used to ide...Microbial janitors tackle nuclear clean-up problems
...ination suits and respirators, are beingexposed to radiation as they work. And they still have a substantial p...t to dispose of when they'redone. In some cases, radiation fields may be too high for human exposure, even for afew minutes, or the configuration of the space ......probe itschemistry. Select wavelengths of infrared radiation that strike the target sample areeither absorbed or transmitted by the molecules, thus providing a chemicalsignature. That infrared signature tells an analyst what's present and how much.Being able to achieve spatial resolution has been a long-time g......and hit you. The job may take robots, because the radiation levels are so high. It's adifficult and expensive task to do. " To judge whether the synthetic sludges are realistic representations of theirmore lethal counterparts, group member Jun Liu of PNNL has done transmissionelectron microscope (TEM) work c......ew crystals of ribosomes, and, toprotect them from radiation damage, froze them to -173°C. Crystals provided theresearchers with molecules that are arranged in a regularly repeated pattern fortheir studies. An intense x-ray beam from the Light Source penetrated thecrystal, resulting in tens of thousands...Jurassic period mammal teeth found; prevailing theories challenged
... present in the SouthernHemisphere, and that early radiation of mammals was not restricted to theNorthern Hemis...s have under estimated the time ofthe beginning of radiation that led to modern groups of mammals, and thatradiation occurred in the Southern Hemisphere." -- Wi......and immune systems after high-dose chemotherapy or radiation for cancer. Stemcells are earlier cells which have the unique capacity to self-perpetuate. Theygenerate progenitor cells and blood cells throughout life. Progenitors have noself-renewal capacity--they only give rise to more differentiated precursorce...USGS issues wildlife health alert: Chytrid fungus infection
...ines, including increased exposure to ultraviolet radiation due to ozone thinning, the spread of non-native predators, contamination from pesticides and other chemicals, and rising temperatures. Many biologists suspect that a combination of factors may be responsible....Scientists find genetic links for deadly type of breast cancer
...nd Stephen P. Ethier, Ph.D, associate professor of radiation oncology....Climate change and greenhouse gases: The scientific literature reviewed
...ands ofyears. By increasing the amount of infrared radiation absorbed into theatmosphere, these gases produce a warming influence at the Earth's surface. The authors note that carbon dioxide is not the only influence on global climatechange, but that during Earth's long-term geologic history, large-scalevariat...