Study Associates Asteroid Or Comet Impact With Extinctions In Argentina
... of magnesium oxide and calcium oxide, significant amounts ofiridium and chromium, and only the tiniest traces of water. The study shows the glass occurs just below a layer of dusty deposits containing fossil evidence of a 3-million-year-old disappearance of 36local types of animals....International Genome Team Deciphers Genetic Instructions For A Complete Animal
...than those ofbacteria or yeast. They contain large amounts of repeated DNA that doesn'tencode proteins but probably plays some role in chromosome function ororganizing genes or regulating their activity. For almost a decade, teams on both sides of the Atlantic snipped and sequencedmillions of bits of worm DN...Rivers May Be Emitting Substance Involved In Ozone Destruction
... Nitrous Oxide Rivers may be emitting significant amounts of nitrous oxide as a result ofeffluents from wastewater treatment plants and agricultural fields, according toa studyby the U.S. Geological Survey. In the atmosphere, nitrous oxide (N2O) acts as acatalystin ozone depletion. The government study sh......ll known asa goblet cell, which produces excessive amounts of mucus in the airway passagesduring an asthma attack. One interesting aspect of IL-4 and IL-13 is that they appear to bedetrimental only in lung tissue. In other parts of the body, they perform goodworks, according to Corry. In the gut, ...Bones of Crocodile-like Beasts Tell Tale of Global Warming
... indicate that at least once inEarth history, high amounts of the greenhouse gas warmed Earth to much highert...t, and carbon dioxide floatedskyward. Besides huge amounts of lava in the Arctic, where hardened lava rocktoday measures more than a kilometer thick in some pl...Cedars-Sinai Tip Sheet For Dec. 21
...h a sweeping beam,and is able to detect very small amounts of calcium in artery walls. "Whatthis means," says Daniel Berman, M.D., Chief of Cardiac Imaging in theDepartment of Imaging at Cedars-Sinai Medical Center and Director of theHeart Watch Program, "is that patients who are at risk for coronary heartdi...AHA Issues Scientific Statement On Infective Endocarditis
...eria relied on tests that measuredbacteremia (high amounts of bacteria in the blood), regurgitant murmur (a heartabnormality) and blood vessel complications. The new diagnostic strategyincludes using a procedure called echocardiography that provides an ultrasoundimage of the heart to detect infection. Prev...Biotech Creates New Solutions And New Problems
...y because as crop plants age they mayproduce lower amounts of the Bt protein. Minor failures have occurred over the past three growing seasons. InTexas, corn earworms with high tolerance to the Bt toxin Cry1Ac invaded somefields of Bt-cotton, virtually destroying the crop. In Australia, the principal...Formaldehyde Emissions From Consumer Products
...ernail polishes and hardeners can emit substantial amounts of formaldehyde,"according to chemist Thomas Kelly, Ph.D., a Battelle senior research scientist and lead author of the article. Often the initial emission rates from such products exceed those of uncovered pressed-wood products, which are noted for ...Experimental Therapy Makes HIV-Infected Cells Commit Suicide
... purpose, they were unable to introduce sufficient amounts of proteins to affect the functions of cells. On another bike ride, Dowdy thought that proteins might beeasier to introduce if they were unfolded first. "Denatured proteins seem to transduce more efficiently across the cell membrane and appear to be ...Swimming Proficiency Of Marine Mammals Ranks Them Among The World's Elite Animal Athletes
...environment, these mammals have to spendinordinate amounts of time grooming a fur coat," Williams said. "They don't haveinsulating blubber like other marine mammals, so to counterbalance the heat lossthey have an extraordinarily high metabolism. They eat 25 percent of their bodyweight in food every day and h...Farmers Can Afford To Clean Up Gulf Of Mexico, Analysis Shows
...ers. Farmers aren't completely to blame. Huge amounts of nitrogen are found naturally in the air, in the soil and in living organisms, and all of these contribute to the nitrogen moving down the Mississippi. "If farmers stopped putting nitrogen on the fields today, we would still get nitrogen leaking ou...Gold Finds Life, Energy, Controversy In Earth
...ery oil-bearing regionin the world must have large amounts of microbiology," he says. Writes Gold: "In my view, hydrocarbons are not biology reworked by geology (asthe traditional view would hold) but rather geology reworked by biology. Inother words, hydrocarbons are primordial, but as they upwell into Ear...Experimental Drug Derived From Snake Venom Shows Promise In Reversing Effects Of Stroke
...ogen level and body weight. The additional amounts of ANCROD administered is adjusted based on theamount of fibrinogen in the blood, which is regularly monitored for 3-to-5 daysduring hospitalization, according to Sherman. By keeping the fibrinogen levelsbetween 40-70 milligrams per deciliter of blo...Penn State Engineers Develop New Simulation For Ultrafine Particle Growth Process
...e, but is also fast, accurate and uses only modest amounts ofcomputing power. Matsoukas and his research group are using the simulation to understandthe grouping and breakup processes that ultrafine titanium dioxide particlesundergo before they reach their final size. Formation of ultrafine,nanometer...Dietary Vitamin A Supplements Improve Maternal Survival In South Asia
... weekly supplements containing recommended dietary amounts ofvitamin A or beta-carotene, or a placebo. The trial's purpose was explained atcommunity meetings, and written consent to participate was obtained fromsubdistrict leaders during the year prior to starting. Verbal consent toparticipate was obtained f...Researchers Discover Genetic Mutation For Rare Form Of Dwarfism
...mily members havehigh-pitched voices and increased amounts of abdominal fat. Except for asomewhat delayed onset of puberty, which did not affect their fertility, theydid not manifest any signs or symptoms to suggest deficiency of other pituitaryhormones. In ongoing research since identifying the def...Plastics - Easier To Recycle Than Commonly Thought
...ry (NPL). Researchershave found that adding large amounts of particular sorts of "contamination" intoa granulated plastic has very little effect upon the physical properties of theproduct once it is re-moulded back into another product. This could mean thatproducts that are functional but not necessarily s...Scientists Study Protein's Role In Tumor Development In Fish
...n cells,conventional wisdom suggests that if large amounts of cyclin are produced, cellswill replicate at a h... to find cyclin. But instead,they found only small amounts of the mRNA that codes for cyclin. In contrast, inthe spring, when the tumors were dying, the resear......), an immune system protein ispresent in increased amounts in damaged heart tissue. TNF exerts its effects byinteracting with specific TNF receptors that are on the surface of cells. WhenTNF binds with TNF receptors, it sets off a chain of events within the cell thatmay lead to further damage to the heart....