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Tag: "variation" at biology news

New brain-chemistry differences found in depressed women

...duction system. The findings also show significant variation between individuals with depression ?variation that seems to be linked to whether or not the patients respond to an antidepressant medication. The study, performed by researchers at the University of Michigan Medical School affiliated with the U-...

Monoclonal antibody reduces exacerbations in asthmatics

...gnificant decrease in the diurnal (during the day) variation in the PEF rate." (With PEF monitoring, patients take as deep as a breath as possible, then exhale as forcefully as possible into the mouthpiece of the PEF meter for three tests. As a gauge for pulmonary function, it is especially useful in patients...

Low levels of neurotransmitter serotonin may perpetuate child abuse across generations

... first to show that naturally occurring individual variation in maternal behavior in monkeys can affect the brain development of the offspring, and the first to show a link between serotonin and infant abuse in primates. Other research using rats as animal models has shown that serotonin production is influen...

Chromosomal microarray analysis proves accurate

...s can often determine if this is a normal familial variation or a disease-causing one....

Scientists identify a candidate gene for osteoporosis

... potential genetic association between DARC gene variation and these traits in humans certainly makes it worthy of further investigation." ...

Genes and genius: Researchers confirm association between gene and intelligence

...ing skills. When people had more than one positive variation in the gene, the improvements in performance IQ we... at a single marker in the gene and noted that the variation was related to an increase in IQ. A more recent Dutch study looked at three regions of DNA along the...

Virtual duck bills demonstrate species coexistence

...sizes than species with wide spacing. In order for variation in bill morphology to lead to resource partitioning, each trait must impose both costs and benefits on foraging ducks. It is the trade-off between these costs and benefits that allows resources to be partitioned." "Foraging ducks are faced with the...

Vaccine to cope with viral diversity in HIV

...is computational method clarifies and analyzes the variation found in the strains of the virus by describing th...elements of the virus. These antigens compress the variation found in many viral strains into lengths suitable for vaccine immunogens. "We can capture 62% of the...

The influence of the menstrual cycle on the female brain

What influence does the variation in estrogen level have on the activation of the female brain? Using functional Magnetic Resonance Imaging, Jean-Claude Dreher, a researcher at the Cognitive Neuroscience Center (CNRS/Université Lyon 1), in collaboration with an American team from the...

Microfossils unravel climate history of tropical Africa

...e results provide further insight into the natural variation of climate and the possible consequences of a warming earth on precipitation in central Africa. ...

Prehistoric mystery organism verified as giant fungus

...oyce said. And Prototaxites displayed a much wider variation in its ratio of carbon-12 to carbon-13 content than would be expected in any plant. Geological processes can alter the isotopic composition of fossils, but Boyce and his colleagues conducted tests to verify that the carbon isotopic composition of ...

Primitive yeast yields secrets of human cholesterol and drug metabolism

...lecular underpinnings of so-called pharmacogenetic variation will have a big impact on the future of medicine,?he says....

Gene study shows three distinct groups of chimpanzees

The largest study to date of genetic variation among chimpanzees has found that the traditional, ...c differences, two to three times greater than the variation between the most different human populations. In the April 2007 issue of the journal PLOS Genetics...

Twin studies reveal genetic components leading to cardiac and kidney disease

...system, showing that this link is due to a genetic variation and therefore runs in families. Heredity and K...nges to the kidney’s filters are caused by genetic variation at multiple points along the adrenergic pathway. Links between adrenergic activity and renal injury...

New species declared: Clouded leopard on Borneo and Sumatra

...are supported by separate research on geographical variation in the clouded leopard, based mainly on fur patterns and coloration of skins held in museums and collections. “The moment we started comparing the skins of the mainland clouded leopard and the leopard found on Borneo and Sumatra, it was clear we ...

Scientists find new genes for Crohn's disease

...bility to the disease. "We propose that genetic variation in the ATG16L1 gene leads to alterations in how the body uses autophagy and therefore may result in increased persistence of [toxic] cellular and bacterial components. This may lead to an inappropriate immune activation and increased risk of Crohn's ...

Analysis of rhesus monkey genome uncovers genetic differences with humans, chimps

... and human genomes, the group also studied genetic variation in macaque populations, and developed a set of 'single nucleotide polymorphisms' or SNPs (single base DNA differences) that can be used for future analysis of inheritance of biomedically important traits in rhesus. The rhesus genomic DNA samples use...

Common gene version optimizes thinking -- but with a possible downside

...ged from the first study to explore the effects of variation in the human gene for a brain master switch, DARPP-32. The researchers identified a common version of the gene and showed how it impacts the way two key brain regions exchange information, affecting a range of functions from general intelligence to...

Female Antarctic seals give cold shoulder to local males

...ice enables the seals to avoid the loss of genetic variation which occurs when females of the species only mate... of other species have shown links between genetic variation and visual traits. The scientists believe that female fur seals may be able to assess male genetic ...

Horse genome assembled

...enome, researchers produced a map of horse genetic variation using DNA samples from a variety of modern and anc...red. This map, comprised of 1 million signposts of variation called single nucleotide polymorphisms, or SNPs, will provide scientists with a genome-wide view of ...

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