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Tag: "variation" at biology news

Study Demonstrates Gene Expression Microarrays are Comparable and Reproducible

...oratory practices comprised the smallest source of variation inthese studies. Measurement errors common to all labs were the next mostcommon contributor, and biological differences in different sampleswere the largest source of variation.“This study indicates that microarrays have a high degree ofreproducibili...

The secret lives of whales

... individual whales. He was amazed at their genetic variation ?an indicator of the past size of their population. Piecing together their ancient family trees, he has discovered that the Antarctic population of minke whales is now the longest surviving whale population on earth. It was also once the largest—many...

Gene variations explain drug dose required to control seizures

...estigators report the first clear evidence linking variation in genes involved in the action or metabolism of t... genetic differences between patients do influence variation in response to anti-epileptic drugs for patients with epilepsy. "In time, we hope to have a number ...

ASU researchers finds novel chemistry at work to provide parrot's vibrant red colors

...n display fantastic colors but exhibit very little variation in color within a species ?at least in colors visible to us. Parrots in general may not be using color in the classic cases of mate choice or competitive ability," he said. "Exactly why they are so uniformly colored remains an interesting mystery to ...

Transport System Smuggles Medicines Into Brain

...n display fantastic colors but exhibit very little variation in color within a species ?at least in colors visible to us. Parrots in general may not be using color in the classic cases of mate choice or competitive ability," he said. "Exactly why they are so uniformly colored remains an interesting mystery to ...

Bird Brains Show How Trial and Error May Contribute to Learning

...mprovise, experimenting with a slower, more sultry variation or emphasizing different notes. Neurobiologists studying the finch now say the improvisation arises from a component of a crucial learning circuit in a section of the forebrain that seems to generate the trial and error necessary to master sophistic...

Affymetrix and the Karolinska Institutet Announce Translational Medicine Strategic Alliance

...relevance of both gene expression and DNA sequence variation in key areas of unmet medical needs. "Today we have access to a very broad range of population-based clinical materials and data, that we want to study in order to understand the importance of genetic factors for emergence and treatment of various d...

World's largest rainforest drying experiment completes first phase

...orest responses to the "umbrellas" from the normal variation in tree growth, tree death, leaf production, and other aspects of forest behavior, researchers compared this dry plot of forest with a similar plot, from which rainfall was not excluded. These two forest plots were compared for a year prior to instal...

International HapMap consortium expands mapping effort

... create an even more powerful map of human genetic variation than originally envisioned. The map will accelerat...d test virtually the entire known catalog of human variation on the HapMap samples. This will increase the density of SNP "signposts" across the genome from the ...

Children's taste sensitivity and food choices influenced by taste gene

...ook advantage of this new knowledge to look at how variation in taste genes might relate to the taste likes and dislikes of children and parents." In the study, to be published in the February 2005 issue of Pediatrics, researchers compared taste sensitivity and food-related behaviors across three genotypes of...

Variation in women's X chromosomes may explain differences among individuals, between sexes

...somes of women has revealed an unexpected level of variation among individuals, according to new work by resear...e sexes, he said. Willard said that the extensive variation in gene activity in the sex chromosomes means that, in essence, there is not one human genome, but t...

Discovery Promises Simpler Therapy for Sickle Cell Disease

...on characteristic of sickle cell disease, and that variation in symptom severity among patients may be explained, in part, by variable deficiency in the processing of nitric oxide," Stamler said. In light of the discovery, the researchers call for a re-evaluation of the role that nitric oxide may play in othe...

Increased risk of osteoporosis associated with gene that one in five people have

About nineteen percent of people have a genetic variation that may increase susceptibility to osteoporosis, ...hip joint. "The data suggest that this particular variation of the gene produces an enzyme that breaks down estrogen faster than usual, leading to low serum est...

Birds brains reveal source of songs

... another, still unexplained, pathway compares that variation to the bird's memory of the father's song. Gradually, the bird gets it right more often and eventually sings only the songs of its elders. ...

Chemicals in tattoo inks need closer scrutiny

...chers say. Finley-Jones and Wagner expect that the variation found in their testing and the potential presence of toxic metals will encourage regulators to begin monitoring the tattoo ink industry more closely. There are other problems with unknown compositions of tattoo inks. For example, surgery to remove t...

Bioelectronic ‘signatures?hold key to DNA mutations

...unearthing the mysteries behind individual genetic variation and diseases like cancer are fine differences ?single nucleotide polymorphisms, or “SNPs??buried within the 3 billion chemical bases of DNA comprising the human genome. Not every SNP found will necessarily cause a mutation or determine our eye or hai...

Brain Scans Reveal How Gene May Boost Schizophrenia Risk

...other of two common versions of the gene. "A tiny variation in the gene that makes the enzyme that breaks down dopamine causes a complete flipflop ?not a mere difference in degree ?in dopamine activity in these two brain areas," explained NIMH's Dr. Andreas Meyer-Lindenberg, who, along with Dr. Karen Berman a...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...e map could allow researchers to look for a single variation in the complex genetic code and know all the variations associated with it, since all are part of the same haplotype. The Maine research group challenges that proposal, demonstrating that genes within a haplotype function independently. The group in...

New World founders small in number

...onstant over time. Studying levels of DNA sequence variation at a single genomic region, or loci, can offer ins... population genetic history could be found despite variation among genes. He also added an additional parameter to standard models to incorporate changes in the ...

Scientists discover that three overlapping signals in embryo help get the backbone right

... specimens of X. tropicalis also have less genetic variation than outbred populations of X. laevis, and the genome of X. tropicalis has been sequenced. Harland is pioneering the use of X. tropicalis in genetic studies, creating numerous mutants that can be used to explore the role of various genes in developme...

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