All Mixed Up: How Do Hybrids Fit Into The Picture?
... factor in determining fitness, as hybridshave the capacity to develop either enhanced or decreased fitness," says Fritz.However, environmental conditions and interactions of hybrids in differentenvironments are equally important. Fritz proposes a new theoretical model that he calls the "ecological resistanc......nds incalcium concentrations and acid-neutralizing capacity (an integrated measure ofacidity resistance) in stream water have shown significant decreases over thepast 15 years....Genetic Research Boosts Understanding Of Iron's Path Through Body, Diseases Of Iron Metabolism
...ting that thetransferrin cycle operates at maximal capacity during normal erythropoiesis andthat half the normal number of transferrin receptors are insufficient to do thejob. Since these mice exhibit a form of anemia, the transferrin receptor genemight be mutated in some anemic people, says Andrews, who, as ......e is temporarily offset, however, by theremarkable capacity of muscle fibers to regenerate for a time." By better understanding this sequence of cellular events, researchers candevelop better ways to monitor and hopefully prevent the progression of thisprocess. This work was supported, in part, by grants from...Jefferson Scientists Find Link Between Learning And Preventing Alzheimer's
...y protects the brain from disease but increasesits capacity to repair and regrow damaged cells. "We've shown that a learningenvironment can encourage cell growth and also reduce cell death as well byabout 45 percent. That includes both aging, old cells and young cells thatspontaneously die." The scien......omerase to extend thelife span of cells lay in its capacity to lengthen telomeres. In the current study, a collaboration by the laboratories of ElizabethBlackburn, PhD, chair of the Department of Microbiology and Immunology at UCSFand Nobel laureate J. Michael Bishop, MD, chancellor of UCSF, researchers haved...Plants Use 'Snorkels' To Survive Floods
...cing the life-saving shoots. Differences in the capacity to adapt to flooding have a major impact on the natural distribution of plants in low-lying river areas. In such areas in the Netherlands, some species can only be found in locations which are rarely flooded, for example dikes and embankments, wherea......work bydamaging DNA. If a breast tumor has a poor capacity to repair this damage, itwill die," remarked Dr. Latimer. Variations in NER activity among the breast cancer patients studied also suggestthat therapies could be custom tailored, according to Dr. Latimer. "If a breastcancer biopsy indicates...UC Berkeley Conference On Population Growth And The Environment
...sions will include an overview of Earth's carrying capacity andgrowth limitations and a discussion of population and environmental issues indeveloped countries. The afternoon will include a session on developingcountries. Throughout the day, panelists will identify key factors in the humanpopulation explosi...Dehydration makes exercise-induced asthma worse, study by UB researchers finds
...eter and/or treadmill. Each person's forced vital capacity -- the volumeof air blown out in one second (FEV1 ... state of hydration, butthey started out with less capacity when they were dehydrated, Cerny said. "Asthmatics are more sensitive than non-asthmatics to......San Diego, are compounds that are known tohave the capacity to disrupt natural hormone activity in humans - an...s in our environment or even dietary ones have the capacity tointerfere with or modulate hormone function and have serious consequences forreproduction, immune ...Nature publishes secret of abalone shell strength
...y molecules ofa protein that have a truly enormous capacity to absorb shock without breaking,"said Dan Morse, professor of molecular genetics and biochemistry and chairman ofthe Marine Biotechnology Center. "From studies in our lab in which we cloned the gene that codes for thisprotein, we're able to ...Divers may soon wax lyrical about some new hot installation -- The water's fine
... spaghetti-maker. Another way to extend thewarming capacity could be using a combination of waxes that freeze at differenttemperatures, so that heat is released gradually as the temperature drops. The technology for trapping wax inside microcapsules, created by YvonneBryant and David Colvin at Triang...New enzyme tied to tangles in Alzheimer's disease
... Unfortunately, nerve cells seem to have a limited capacity to produceenough Pin1 to keep up with phosphate additions to the tau protein. In thebrains of patients with Alzheimer's disease, Pin1 is apparently depleted byworking overtime to keep fixing tau. For this study, the researchers comparedtissue sample...Damaged spinal cord found to have greater potential for nerve regrowth than thought possible
...sue, have published a new study showing tremendous capacity for nerve fiber regeneration fromtransplanted adult nerve cells in adult spinal cords with large lesions. When nerve fibers in the spinal cord are severed, they are no longer able to relay signals to other parts of the nervous system.The segment of t......significant impact in the field ofbiomedicine, and capacity for future academic leadership. The five individualswe selected clearly distinguished themselves in all three areas, though we wouldbe remiss if we didn't say how extremely impressed we were with all of thecandidates. This is an important program a...Mobile DNA sequences could be the cause of chromosomal mutations during the evolution of species
...but they can be favourableincreasing the carrier's capacity for survival and reproduction and, in time,lead to new species. One of the organisms which scientists have studied in great depth with regard tothese changes is the Drosophila fly. This organism has giant sized chromosomesin the salivary glands of...H.pylori bacteria and their human hosts
...e most important factor in the relationship is the capacity of the hostresponse to the bacteria," said Kirschner, an assistant professor ofmicrobiology and immunology in the U-M Medical School. "Some people have theability to flush the bug from their systems and some don't. We don't know whythese individual...U-M scientists identify genes that make blood "thicker" and more likely to clot as we get older
... and blood coagulation. Itexplains why coagulation capacity is almost twice as high in older people andother m...ariations." When mammals are born, the coagulation capacity of their blood is only 40percent to 45 percent of a young adult's, Kurachi explains. After birth,clo...World's biodiversity becoming extinct at levels rivaling Earth's past 'mass extinctions'
...ldings ofspecimens and literature on plants and by capacity building in developingcountries with scarce resources. Currently, 80 percent of the world's scientistslive in industrialized countries, which have about 20 percent of the world'spopulation and only 20 percent of the world's biodiversity. "Nations wil...