Tag: "fluctuations" at biology news

Biodiversity as insurance in the face of change

...s aninsurance policy against unknown environmental fluctuations and disturbances." The idea, posited by Ives and co-authors Kevin Gross and Jennifer Klug,UW-Madison graduate students, suggests that ecologists should shift attentionfrom the interations among species, and instead focus on how different speciesreact...

Uncovering the role of water vapor in climate change

...th human-caused influences and the Earth's natural fluctuations toexplain changes in our climate. Although carbon dioxide gets most of theattention in greenhouse gas discussions, water vapor plays an even bigger rolein heating up the Earth's atmosphere. This is because of water's uniquemolecular structure and p...

Newly released satellite images of Antarctica a valuable scientific benchmark

...or establishing abaseline to measure environmental fluctuations in one of the harshestenvironments on Earth known to harbor life. "The imagery released today represents a valuable benchmark for studiesof changes in the region," said Scott Borg, who manages the U.S. AntarcticProgram's geology and geophysi...

Hurricane Floyd signal of a new weather era?

...or belt" tokick into gear. One likely candidate is fluctuations in the sun's magneticfield, which affects the amount of solar energy reaching the Earth and tends tochange on a 20-27 year cycle. What is far more certain, he said, is the implication of the trend onceit's clearly underway. Among othe...

Researchers discover genetic basis of heritable sleep disorder

...ily biochemical and behavioral cycles -- including fluctuations in sleep andwakefulness -- that are collectively called circadian rhythms. People with FASPS have a "fast" biological clock -- their internal clock's"day" is shorter than 24 hours. If left unconstrained by the demands of everydaylife, people with a ...

Stanford scientists use noise to sort proteins

...t, that uses asymmetricbarriers to harness thermal fluctuations to produce directional motion. Suchdevices were proposed in two theoretical papers published last year by RobertAustin of Princeton and Thomas Duke of Cambridge, and Denis Ertas of Exxon. One of Boxer's former students, Jay Groves, now a Director's P...

Oxygen measurements yield greenhouse clues

...ur breathing," says MrLangenfelds. "Typical oxygen fluctuations indoors or in city air would be far greater thanthis," says Mr Langenfelds. However the oxygen measurements shed new light on the extent to which theworld's forests and oceans share the task of absorbing half the carbon dioxidegenerated by burning of...

Tumor Oxygen Level And Blood Flow Fluctuate, Duke Scientists Discover

...blood flowwithin a tumor, scientists said. "These fluctuations in oxygen level and bloodflow are not predictable ...were not stable. The clinical implications of such fluctuations could be serious, Dewhirst said.For example, fluctuations from low to high oxygen levels might reduc...

New Edition Of Ecological Monographs Is Now Available

...ions surrounding the lake. Both naturaland gradual fluctuations in spring flood levels have enabled black ashpopulations to adapt to their changing environment. Researchers observed thatpopulation stability was due to the strategically different reproduction methodsbetween trees located within the floodplain and ...

Duke Studies Show U.S. Central Plains Vulnerable To Global Warming

...region rapidly changed witheven short-term climate fluctuations -- was not surprising, Clark said. "One reason this region is so susceptible to climate change is that itlies at the boundaries between air masses that have very different climatesassociated with them," he said. "The center of the continent ...

Wildlife Dying At The Doorsteps Of World's National Parks, Study Says

...atpopulations may be drive to extinction by random fluctuations in demography andloss of genetic diversity. But the authors warn that conservation measures thatfocus only on maintaining or bolstering populations within protected areas areunlikely to prevent extinctions....

Bless You

... now, many scientists were also convinced that the fluctuations inviral shape that happened outside the cell were probably minor and of littleimportance. So when Smith teamed up with chemist Gary Siuzdak and his colleaguesat the Scripps Research Institute in La Jolla, California, to probe the motionsof the virus ...

Perkin-Elmer To Introduce New Instrument Based On Breakthrough DNA Analysis Technology

...sonable terms; (9) the loss of key employees; (10) fluctuations in foreigncurrency exchange rates; and (11) other factors that might be describedfrom time to time in Perkin-Elmer's filings with the Securities and ExchangeCommission....

Concerns For Australian Sea Lion

...hat we have no idea what's causing these dramatic fluctuations in pup mortality, says Dr Shaughnessy. Possible causes of death include parasites, such as hookworm, environmental perturbation causing food shortage for lactating female sea lions, high rates of aggression by adult males, direct human harassmen...

New Fluorescence Technique For Ultra-Sensitive Enzyme Characterization Developed - Screening Catalytic Activity At The Single-Molecule Level

...superimposed laser foci, and detects correlated fluctuations that arise from single molecules carrying two spectrally distinguishable fluorescent labels. It allows precise and highly specific detection of molecules on a large unspecific fluorescent background; moreover, the method is fully compatib...

Purdue Study Aims To Boost MRI Capabilities

...l view of the body," Nyenhuis says. "But pulses or fluctuations can induce electric currents in the patient, called eddy currents, which then may stimulate nerves and muscles." Little human data are available on the stimulating effects of MRI gradient fields, Bourland says. "Our research is aimed at determining a...

Dating A Caveman

...fornia's Mono Lake to reconstruct detailed climate fluctuations in the area since 10,000 years ago, shortly after the last Ice Age had ended. Ku's research on the Zhoukoudian finds is supported by a grant from the National Science Foundation. Further field sampling and lab analyses are continuing....

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