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Tag: "variation" at biology news

A slight difference and significant similarities

...he Desiree variety lie within the same of range of variation as the five conventional varieties. The exception is the higher content of inulin polysaccharides. There was no evidence of any new, unexpected substances. Inulin is a polysaccharide that is formed as a storage molecule in many plants such as chicor...

Rodent social behavior encoded in junk DNA

... an extraordinary example of research linking gene variation to brain receptors to behavior." Hammock and Young were particularly intrigued with microsatellites, repeating sequences of letters in the genetic code peppered throughout these regulatory areas of the vasopressin receptor gene. "It was considered ...

Traditional models underestimate extinction rates

...ion: Drake JM (2005) Density-dependent demographic variation determines extinction rate of experimental populations. PLoS Biol 3(7): e222. ...

Neanderthal teeth grew no faster than comparable modern humans'

... "We feel that they give us some insights into the variation that exists within modern humans." For the study, the researchers used precise dental impressions Guatelli-Steinberg and Larsen made of 55 teeth believed to come from 30 Neanderthal individuals. These were compared to 65 teeth from 17 Inuit, 134 te...

UCSD discovery may provide novel method to generate medically useful proteins

...ded the research team. "Only antibodies have more variation than this protein in phage. However, the genetic mechanism used by the phage to generate this diversity is completely different from that used by animals to produce antibodies, and has the advantage of giving the protein greater stability." "If we...

Freeze-dried mats of microbes awaken in Antarctic streambed

...sotope analyses of the cyanobacteria that measured variation in atmospheric carbon over decades, indicated the streambed had been dry for about 20 years. "After we diverted the water into the channel, photosynthesis began the same day and the mats became abundant within a week," she said. "This showed us that...

Genetic variation alters response to common anti-clotting drug

...cientists discovered that people with a particular variation of the VKORC1 gene generally took similar doses of warfarin. The genetic variations divided patients into three main groups: low, high, and intermediate dose. The intermediate group included people with a combination of the low- and high-dose gene v...

No single gene for ageing

...estyle and immunity play an additional role. Great variation between individuals can be seen in organisms such as round worms ?and in humans." Studies of ageing also give insight into the causes of cancer, because cancer and ageing have the same background causes, thinks Vilhelm Bohr, professor at the Univers...

'Patient-choice' C-section rate rises 36%: HealthGrades study

...dent healthcare ratings. The study also finds wide variation from state to state in the rate of these types of C-sections, for which there is no medical necessity. Complication rates from "patient-choice" C-sections are one factor in the ratings of maternity care at more than 1,500 hospitals, which HealthGrad...

A step toward the $1,000 personal genome using readily available lab equipment

...mation against a reference genome, finding genetic variation in the bacterial DNA that had evolved in the lab. "These developments give the feeling that improvements are coming very quickly," said HMS professor of genetics Church, who also heads the Lipper Center for Computational Genetics, MIT-Harvard DOE Ge...

Color perception is not in the eye of the beholder: It's in the brain

...oking to identify the genetic basis for this large variation between retinas. Early tests on the original volunteers showed no simple connection among certain genes and the number and diversity of color cones, but Williams is continuing to search for the responsible combination of genes. ...

Purdue researchers find key to rice blast fungus

... plants varies in different regions due to climate variation and in strains of the pathogen. Xu said that an important area of his future research will be to learn the interaction among several signaling pathways in rice blast fungus that allows the pathogen to communicate with the plant. ...

Baby's genes affect mom's cholesterol levels

...re not always as predicted. For example, a genetic variation that raises the levels of triglycerides and cholesterol when expressed in mothers may lower these levels when it is expressed simultaneously by the fetus in the placenta. These findings have implications for many women who are advised not to have ch...

California computer scientists double volume of data in NIH biotech repository

...ing of an individual's DNA yields a map of genetic variation which can give clues to the genetic underpinning o...pulation. SNPs account for the most common type of variation in DNA sequence in humans and due to the recently developed high-throughput genotyping technology, g...

U-M scientists say fused genes trigger the development of prostate cancer

...ing of an individual's DNA yields a map of genetic variation which can give clues to the genetic underpinning o...pulation. SNPs account for the most common type of variation in DNA sequence in humans and due to the recently developed high-throughput genotyping technology, g...

Weapon performance determines mating success in the collared lizard

...pic variation. At the gross level, such phenotypic variation can include that of body size and weapon morphology, as well as of weapon function and performance. In a study published in the September issue of The American Naturalist, A. Kristopher Lappin (Northern Arizona University) and Jerry F. Husak (Oklaho...

Studies on human genome variation provide insight into disease

...ymous genetic 'twins.' "Research in human genetic variation is rapidly moving towards realizing our aims of improving diagnosis of common diseases such as diabetes and heart disease," says Cardon, "but the genome is tricky; it won't reveal its secrets easily. The real disease-causing culprits can have many s...

Housecat-sized Siberian tiger cubs get collared

...ymous genetic 'twins.' "Research in human genetic variation is rapidly moving towards realizing our aims of improving diagnosis of common diseases such as diabetes and heart disease," says Cardon, "but the genome is tricky; it won't reveal its secrets easily. The real disease-causing culprits can have many s...

Human cerebellum and cortex age in very different ways

...w they age, and that we can learn about functional variation and evolution by studying gene expression changes with age." The researchers used data from gene chips to look at gene expression -- the degree to which various genes are turned "on" and "off" -- in five different regions of the brain's cortex. They...

Cracking the perception code

...ay attention to this," he noted. "They assume that variation in firing rate is enough as a measure." ...

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