Tag: "variability" at biology news

Born under the sun: UV light and the origin of life

...units were replaceable and variable. Exactly this variability could have paved the way to the variability of the future genomes". Three of the four nitrogenous bases that protected RNA from UV on primordial...

Ancient pollen yields insight into forest biodiversity

...ot supported by data." "What we are seeing is huge variability within populations," said Clark. "And this variability means they overlap in ways that determines who's going to win and who's going to lose. And that var...

Finished Y-chromosome sequence reveals a genomic 'crystal palace'

...er to minimize complications due to normal genetic variability among males, the sequencing was performed on the Y chromosome of one male, whose identity remains anonymous. Page said much of the credit for the high-precision sequencing goes to the Washington University Genome Sequencing Center, whose researchers ...

New finding has implications for scientists designing mobile audio interfaces

...l talk more quietly. This is a major new source of variability in users' spoken language to computers, which is opening up new scientific directions for mobile audio interface design." As part of her study, funded by the National Science Foundation, Oviatt and her graduate students asked students aged 7 to 10 to...

In men chronically exposed to magnetic fields, no disruptions of melatonin exists

...trol study because of the enormous interindividual variability of melatonin secretion and plasma melatonin concentrations in humans. To the researchers' knowledge, this study is the first to examine both plasma melatonin circadian rhythm and urinary 6-sulfatoxymelatonin concentration in subjects who have been e...

Gene helps regulate longevity in flies, and perhaps humans

... not simply favor longevity; instead, they promote variability in life span. The research was a collaboration among scientists at NC State University and the Institute of Molecular Genetics of the Russian Academy of Sciences in Moscow. It was funded in part by grants from the National Institutes of Health, the R...

Rising ozone levels pose challenge to U.S. soybean production, scientists say

...ighly variable, depending on weather, so with this variability a 20 percent increase in ozone could occur next year." Ozone enters plants through stomata (tiny pores in the epidermal layer of leaves) and reduces photosynthesis. Evaporation of moisture also occurs through these pores. Carbon dioxide, researchers ...

Research shows therapeutic cloning can cure Parkinson's-like disease in mice

...y generating dopamine neurons that eliminates that variability in order for therapeutic cloning to work consistently for every animal. While they did not yet develop a new cell line for each of the mice treated, their results prove in principle that the method can work for all cloned cell lines tested. Using th...

Using GPR to estimate tree root biomass

... dioxide on living trees. Although they can detect variability above the ground without harming the trees, it is almost impossible to know what is going on below ground. "We need a way to measure how the root system is responding that does not involve destroying it," said Johnsen. John Butnor, SRS plant physiolo...

New study shows why hypertension affects black males disproportionately

...nce. Power spectral density analysis of heart rate variability (HRV) and blood pressure variability (BPV) were used to derive measures of autonomic modulation. A priori power spectra of R-R intervals ...

Mediterranean hot flush detected after scorching summer

...finite global temperature increase from the normal variability of climate," explained Llewellyn-Jones. "Preliminary analysis of existing results does indicate a general upward trend, but we will be more certain with more time and more data." The UK's Department for Environment, Food and Rural Affairs (DEFRA) an...

Envisat observes resurgent ozone hole

...-IASB. "Superimposed on this is the meteorological variability which this year still allows sufficient chlorine activation over a large area and for a longer period than last year." MIPAS will continue to monitor the condition of the ozone layer for the life of the Envisat spacecraft, together with the spacecra...

Familiarity decides if wolf spider loves 'em or eats 'em

...ook alike. I studied this species because there is variability among the males," says Hebets. Previously, researchers had explored spider behavior with young males and females collected in the field, kept in isolation and then brought together in a laboratory. In the wild, male wolf spiders mature earlier than ...

Activity detailed for sirtuins, involved in metabolism, aging, gene expression

...o their jobs, their second binding site shows more variability and is likely responsible for the specificity of roles seen among the various sirtuins each different sirtuin binds to a different target and carries out a different biological task. The lead author on the Structure study is Kehao Zhao, Ph.D., of Th...

Cognitive performance influenced by gene for prion protein (also affected by mad cow disease)

... of this variation accounted for 2.7% of the total variability in cognitive abilities, further strengthening the assumption that many genetic variations with only a small effect influence human cognitive abilities. The mechanisms by which the prion protein might actually act on cognitive performance are unclear,...

Moderate alcohol consumption after meals can decrease levels of insulin

...ay be a confounding factor that is contributing to variability in the alcohol literature. In addition, given the possibility that alcohol may activate the glyoxylate cycle, an energy pathway that can be switched off by glucose, it may be important for scientists to specifically control for the presence of carbo...

Genes control severity of heart failure, study finds

...nt. Yet heart failure patients exhibit significant variability in quality of life and survival with the condition, he said. "Following a heart attack, some patients are able to return to their normal lifestyle, while others are horribly debilitated," said Rockman. In their study, the researchers set out to uncov...

Researchers describe novel gene mutations associated with Alzheimer disease

...r further enlarging out understanding of the great variability of [familial Alzheimer disease]," the researchers write....

Climate linked to reproduction of right whales

...ould be heading into a period of increased climate variability as a result of continually rising greenhouse gas concentrations," Greene says. And 1996, when the NAO flipped even as right whales were enjoying a banner birth year, "could have been an unusual event -- or a sign of the larger swings in climate that ...

High-tech analysis of vineyard soil

... "After recognizing the dominating role of spatial variability at the field scale, it is now time to deal with it. Clearly, the traditional methods cannot detect these variabilities with sufficient resolution and, therefore, many scientists and practitioners are currently searching for alternative techniques. GP...

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