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Tag: "difference" at biology news

Northern birds are fatter!

...ability of food. "Our current thinking is that the difference in fattening could be caused by differences in behaviour (birds simply feed more intensively in the north) or changes in physiology that the birds experience as they move further north", says Williams. "We know there are major differences in gut stru...

Habitat microstructure drives salamander metamorphosis

...cked particles. This study highlights how a simple difference in habitat microstructure can have a major influence on patterns of development, morphology and evolution. Ronald Bonett and Paul Chippindale from the University of Texas at Arlington, Texas, USA, analysed the type, size and degree of sorting of str...

AIDS-related cognitive impairment exists in two separate forms

...ells reside, and the upper 9/10s of the crypt. The difference in miRNA signatures between these two crypt region...of colon cancer," Boman said. "Our finding of a difference between miRNA expression in normal versus cancerous colon tissues should provide insight into mechan...

Markers of gene, protein, or micro-RNA activity predict outcome in prostate and colorectal cancers

...ells reside, and the upper 9/10s of the crypt. The difference in miRNA signatures between these two crypt region...of colon cancer," Boman said. "Our finding of a difference between miRNA expression in normal versus cancerous colon tissues should provide insight into mechan...

Common molecular 'signature' identified in solid tumors

...h 43 miRNAs allowing scientists to distinguish the difference between normal and malignant tissue. Further tests showed that 21 of the distinguishing miRNAs were deregulated in at least three of the cancers ?and in some cases, as many as five or all six. The researchers defined this limited set as the "miRNA ...

Research tracks whales by listening to sounds

...ent combinations of pulses, tones and pitches. The difference is really striking, but we don't know if it is tied to genetics, or some other reason. "There are also some hybrid sounds that are rare," he added. "We don't know if they are part of a common 'language' that different populations of whales use to co...

Amber reveals ecology of 30 million year old spiders

...ber than in Dominican amber, but that there was no difference between hunting spiders in either region. It was a... producing trees in each region accounted for this difference in size. "Several lines of evidence show that greater structural complexity of Baltic compared to D...

How to grow a bigger brain

...than to hatchery-reared fish. "There's an obvious difference between the hatchery and the wild fish," said graduate student Rebecca Kihslinger, who carried out the study with Gabrielle Nevitt, professor of neurobiology, physiology and behavior at UC Davis. "A simple change affected brain growth in a large-scal...

Sex chromosome genes influence aggression andmaternal behavior, say UVa researchers

...an said. "But this is another component of the sex difference that needs to be examined." In all probability, Rissman said, genes and hormones interact with each other, especially in males, because they have testosterone and the Y chromosome. "It is our hope that these data could lead to the discovery of new g...

All placebos not created alike

...More objective measures of grip strength showed no difference in improvements between the two placebos. The results also provided evidence that what doctors tell patients about side effects directly influences their experience of them. Prior to participating in the study, doctors provided informed consent form...

One fish, two fish: New MIT sensor improves fish counts

...kris, who compared the dramatic improvement to the difference between seeing everything on a television screen and seeing only one pixel. The new sensor system, described in the Feb. 3 issue of Science, could allow government agencies to figure out what's really happening to fish populations, which many envir...

Gene variation increases SIDS risk in African Americans

... "This seemed like a good candidate for a genetic difference that could contribute to SIDS," said Goldstein, "but we had no clear idea how it increased risk since the Y1103 variant did not affect channel operation under normal conditions." Cellular activity, particularly that of nerve and muscle cells, is c...

Face perception is modulated by sexual orientation

...e of the viewer was taken into account, did make a difference in the reactions seen in the thalamus and the orbitofrontal cortex, a region of the brain's reward circuitry. Heterosexual women and homosexual men exhibited a significantly greater response to male faces, whereas heterosexual men and homosexual wome...

Tumor cells that border normal tissue are told to leave

...in tissues. The study demonstrated that it was the difference in Src activity that led to the change in the attachment proteins. When a high Src cell (tumor cell) was next to a low Src cell (normal cell) the attachment proteins changed their characteristics, and the high Src cell became "unglued." In addition,...

Variation in bitter-taste receptor gene increases risk for alcoholism

...ns will have a higher incidence of alcoholism. The difference in the TAS2R16 gene is only one of several genetic and environmental factors involved in risk for alcoholism, according to Goate. "I don't think our result has any implications for the levels of alcoholism within different populations," Goate says. ...

A clue from macaques yields evidence for impaired retroviral defense genes in humans

...ges in the TRIM5 protein were responsible for this difference in battling retroviral infection. This prompted the Malik and Emerman groups to screen human populations for slightly altered versions of TRIM5 that might be able to resist HIV infection. Unexpectedly, the researchers found a single mutation in TRI...

Robot assisted surgery more accurate than conventional surgery

...tly, by showing how the increased accuracy makes a difference to how well a knee works after surgery, we will be able to develop a new generation of less invasive procedures without the risks of error, providing faster recovery and better functional outcomes for patients." The study involved both surgeons and ...

Component in soy products causes reproductive problems in laboratory mice

...ertilized based on previous research. The largest difference between the genistein treated and normal mice was found at six days of age where 57 percent of the egg cells in the non-treated ovaries were single or unclustered; and only 36 percent in the genistein treated group were single We think genistein inh...

Bioactive cement scaffold may improve bone grafts

...l investigator for the project. "They can tell the difference between materials that are bioactive compared to bioinert polymers. Our material is designed to be similar to mineral in bone so that cells readily attach to the scaffold." The researchers used mouse bone cells in their experiments, but in practice s...

Potential heart benefit found in stem cells

... injection (5.9 vs. 3.6 millimeters), and the same difference was seen in the border zones (11.2 vs. 8.6 mm). Capillary density in the border zones of the ADSC group was also significantly increased compared to the control group. The healthy myocardium areas showed no significant differences. "We feel ...

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