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Tag: "geographically" at biology news

Researchers reveal the infectious impact of salmon farms on wild salmon

...other previously unexposed populations coming from geographically disparate regions. "At about the 30 km mark from the farm, those lice become reproductive," says Volpe. "In effect, the farm has exported its lice generating properties ?a cyclical event establishing the potential for re-infections up and down the c...

Study: 'homemade' gene expression technology unreliable

...onth in the journal Nature Methods. They show that geographically separated multi-investigator teams adopting common commercial, rather than homemade, microarray platforms and common sets of procedures are able to generate comparable data. "The important point of the three papers is that with contemporary microarr...

Gov't Creates Gene Database of Normal Human Tissues

...microarray analysis of identical tissue samples at geographically separate laboratories can produce the same quality of results as those done within a single lab**. The normal organ database takes that one step further, enabling scientists and clinicians to compare the gene expression results for their own tissue o...

Revueltosaurus skeleton unearthed at Petrified Forest upsets dinosaur tale

... have claimed. "Sauropodomorphs and theropods are geographically widespread by the end of the Triassic, though the theropods at this time also were small and rare," Irmis said. "What we found suggests that ornithischian dinosaurs did not diversify and get large until the beginning of the Jurassic." "People have a...

Agilent Technologies introduces high-capacity human protein removal system for proteomics research

... have claimed. "Sauropodomorphs and theropods are geographically widespread by the end of the Triassic, though the theropods at this time also were small and rare," Irmis said. "What we found suggests that ornithischian dinosaurs did not diversify and get large until the beginning of the Jurassic." "People have a...

Lactose intolerance linked to ancestral environment

...erous diseases negatively impact dairy herding and geographically restrict the availability of milk, and that humans have physiologically adapted to that," said evolutionary biologist Paul Sherman, a professor of neurobiology and behavior at Cornell. "This is a spectacular case of how cultural evolution -- in this ...

Scientists pinpoint inflammation gene

...relationship between SEPS1 and inflammation in two geographically and ethnically distinct populations of people in the United States, one in Wisconsin and one in Texas. Greg Collier, Ph.D., CEO of ChemGenex, said the discovery of SEPS1 and its function could yield new approaches for inhibiting inflammation, perha...

Wisconsin scientists discover a master key to microbes' pathogenic lifestyles

...very of a master switch in related but diverse and geographically widespread class of fungi is an indication that it was acquired from a common ancestor deep in evolutionary history. The feature is a common mechanism used by the different organisms to adapt to a new environment: the lungs of animals. "It is a stor...

For some young fish, early gene expression is a clear harbinger of fated lifestyle

...s more surprisingly, less-related individuals from geographically different populations nonetheless exhibit very similar patterns of gene expression if they have adopted the same fate--residential or migratory. Thus, the researchers found that levels of expression of a great many genes depend primarily on an indivi...

Vital ocean prey play active role in environment

... other adults. These groups are believed to remain geographically separate. In summer, adults remain close to the edge of the continental shelf, which allows them access to open-water food supplies. Females carrying eggs move offshore to deep water to spawn, where the embryos sink. The embryos hatch into free-swimm...

Insect predation sheds light on food web recovery after the dinosaur extinction

...can now test for its generality. "Temporally and geographically isolated occurrences of severely unbalanced food webs may be a widespread feature of ecological recovery from mass extinction, resulting from instability, incumbency and opportunism in drastically simplified ecological landscapes," say the authors. ...

On the track of tiny larvae, a new model elucidates connections in marine ecology

...nts facilitate normal biological connections among geographically separate populations. Although tiny larvae are impossible to follow directly, advances in modeling ocean currents have made it possible to predict larval movements. However, until now it has remained difficult to test these movement predictions in th...

Electric fish in Africa could be example of evolution in action

...on is possible. One common type of speciation is geographically dependent. Animals diverge into separate species because they become physically isolated from each other. Eventually, genes within each group mutate so that the groups can no longer be considered to be of the same species. Another type of speciation...

DNA analysis reveals rapid population shift among Pleistocene cave bears

...ned DNA samples from 29 cave bear teeth from three geographically close caves in the Ach Valley, near the Danube River in modern-day southern Germany. Twenty of the teeth ultimately provided useful mitochondrial DNA sequence (mitochondrial DNA is especially useful for tracking population changes). The findings indi...

Paper challenges 1491 Amazonian population theories

...cal areas." Bush says the evidence comes from a geographically diverse area: three districts, each with 3 (in two cases) or four lakes. "In each we have one lake occupied and used, and the others little used or not used at all," he says. "So this is a total of 10 lakes that provide three separate instances --...

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