Tag: "variability" at biology news

Humble Pocket Gophers Shed Light On The Genetic Fortitude Of Cheetahs

...nia sea otters and elephant seals, may have little variability among their immune systems and thus may be more vulnerable to outbreaks of disease. "Genetic variation is the stuff of evolution," says Sanjayan. "It allows a population to adapt effectively to changes in the environment. You exist at a price if you ...

Genetic Makeup May Explain Why Some Women Smokers Develop Breast Cancer While Others Don't, UB Study in JAMA Reports

...ults of their study, the first to consider genetic variability as a factor in a person's breast-cancer susceptibility to the carcinogens in cigarette smoke, will be published in the Nov. 13 issue of the Journal of the American Medical Association. The results showed that postmenopausal women born with t...

OHSU Scientists Discover Mice Lacking Dopamine Receptor Are Supersensitive To Alcohol, Cocaine And Methamphetamine

...rugabuse." Grandy explains that humans show a wide variability in the gene thatencodesthe D4 receptor, and there are reports that some forms of the D4 gene maypredispose an individual to drug taking and novelty seeking behaviors.The D4 receptor has been the focus of intense interest since itsdiscovery in1990 bec...

Natural Variability Is Key To River Restoration

...-the-art knowledge about the importance of natural variability to aquatic and riparian ecosystems -- will help river managers and agencies make the argument that unfettered rivers have multiple benefits for nature and for human society....

Top Scientists Challenge Others: Join Biodiversity Year

...bout biodiversity at every level, from the genetic variability of individual species to the workings of ecosystems and to add that to data about how human societies interact with and depend on natural systems. They'll suggest some short-term, intensive international projects that could achieve concrete results ...

Agriculture and urban activities impact water quality in the South Platte River Basin

...ed stream-water-quality," Dennehy said. "Although variability in the type and number of fish can be due to natur...t characteristics, and hydrologic conditions, some variability can be attributed to human influence. For example, suckers, which are tolerant of pollution, dominat...

Mowing, Grazing Of Tall-Grass Prairie Increases

...udies on the effects of fire, grazing and climatic variability on tall grass prairies. Thison-going research looks at these various factors alone and in combination. "One of the things we have learned in the past is that if you burn a prairie annually, speciesdiversity tends to decrease," Knapp said. "Grazing th...

Cells Say The Darndest Things

... there were clear differences." But what does this variability mean for the sea slug? "I can summarize that in three words," says Zare. "I don't know. Not yet. Is it the difference between mature and immature vesicles? Is it the difference of some control? I don't know." It's one thing to read individual words i...

Ecological Consequences Of Jasmonate-Induced Responses For Plants In Native Populations

...ducible defenses allow plants to cope with this variability by altering their defensive phenotype adaptively. The resistance traits elicted by jasmonates are costly in terms of seed production, but these costs are offset by their benefit when the probability of fitness reductions due to herbivore...

New Long-Term Ecological Research Site Funded For Plum Island Sound Ecosystems Study

...hiledamming decreases sediment discharge. Climate variability and long-termpatterns of climate change can also have immense effects on the timing,magnitude and nature of material inputs. Infrequent storms can accomplish indays what would normally occur over decades. Through research at the Plum Island ...

Sturgeon, Trout And Telemetry--USGS Research Mixes Science And Technology At American Fisheries Society Annual Meeting

...ignificant amount of previously undetected genetic variability that has proven useful in identifying subpopulations in sturgeon species. ("Conservation Genetics of Atlantic Sturgeon: Identification and Management of Genetic Diversity," by Barbara A. Lubinski, USGS, and Tim L. King, Kearneysville, W.Va.) Safe D...

Staring And Squirming Help Babies Explore

...nd movement, Robertson says, alsoshows the role of variability in behavior and development: "The fact that thesecycles are irregular may be ensuring a diversity of behaviors that allowsinfants a greater adaptation to their environment. In other words, variation isa source of potential solutions to adaptive cha...

Largest Acoustics Meeting In History Expected

...lly alter the world's climate. To measure climate variability and look for signs of global warming in this part of the world, a Norway-UK-Germany-Russian collaboration has embarked on a program called AMOC short for Acoustic Monitoring of the Ocean Climate in the Arctic Ocean AMOC researchers have been develop...

Media Advisory: 1999 Spring Meeting -- Updated Press Conference Schedule

...ersity of Arizona, Tucson, AZ (researching climate variability and itsimpacts on the ranching industry and water supply in the Southwest) Dr. Dennis P. Lettenmaier, JISAO Climate Impacts Group, Department ofCivil and Environmental Engineering, University of Washington, Seattle,Washington (investigating t...

Revealing the complex patterns of cardiac disease

...l practice is to prescribe medication to eliminate variability forpatients with irregular heartbeats. "This could be doing as much harm as good,"says Professor H. Eugene Stanley, director of the Center for Polymer Studies. Monofractals occur commonly in nature and have long been observed inphysiological systems....

Horseshoe crab studies providing new insight into valuable ancient creatures

... State Partnership program -- is to assess genetic variability inhorseshoe crabs across their geographic range. Investigators are confidentthat unique DNA "markers" can be identified that will allow them todetermine the distribution and movement patterns of different horseshoecrab populations. Fishery managers c...

Fathers pass infertility to sons

... thirties with AZFc deletionscan have considerable variability in the number of sperm in their semen." Ifsperm counts do prove to be higher in younger affected males, said Page, theymight have their sperm harvested and stored until they are ready to start afamily. The latest findings emphasize the importance of...

Purdue study: Aquariums may pacify Alzheimer's patients

... move around in various patterns, sothere's enough variability to keep patients' interest." Edwards says that in addition to increasing attentiveness and alertness inAlzheimer's patients, she found anecdotal evidence that the aquariums also may,in some instances, stimulate short-term memory. She recalls h...

Cellular espionage at play in post-menopausal osteoporosis

...When we first started doing this, we noticed great variability in the ratiobetween signaling receptors and decoy receptors, and we wondered if that was afunction of age or estrogen status," says Osdoby. "We clearly saw that as afunction of age in women there is an increase in signaling receptors and adecrease i...

HIV variant in U.S. and Europe found rare in Africa AIDS cases

...viruses that only use CCR5, then there's almost no variability in V3," saidSwanstrom. "Over the years, we've been asking what's the real role of V3," he added. "Itsvariability is associated with the switch in co-receptors. Now we know it'sclearly not the primary neutralization target for a vaccine." Cohen raise...

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Breaking Medicine News(10 mins):Health News:Sferrella and Demonbreun Join Regents Health Resources 2Health News:Saint Luke’s Medical Group Awarded Patient-Centered Medical Home 2011 Level 3 Recognition 2Health News:Mesothelioma Organization Works to Add Members to ‘Deadliest Cancer Caucus’ 2Health News:Mesothelioma Organization Works to Add Members to ‘Deadliest Cancer Caucus’ 3Health News:One Minute to Herpes Cure Review Reveals Simplest Herpes Treatment 2Health News:Leaky Gut Cure Review Reveals Karen Brimeyer’s Natural Way to Heal Leaky Gut 2
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