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Tag: "population" at biology news

Spleen may be source of versatile stem cells

...norrole in regenerative medicine - might contain a population of potentialislet stem cells.In their pursuit of that finding, the MGH researchers investigated thepossible presence of a protein called Hox11 in these cells. In mammals,Hox11 is a controller of key steps in embryonic development - includingthe forma...

It's not all genetic: Common epigenetic problem doubles cancer risk in mice

...olon cancer patients and 10 percent of the general population -- the extra IGF2 stems not from a genetic problem... cancer patients and 10 percent or so of the human population who have loss of imprinting of IGF2. Only the Princeton mice have been crossed with the APC mice. B...

Male circumcision reduces risk of HIV transmission from women to men

...fHIV infection per act of heterosexual sex among a population withmultiple sexual partners has found that uncircumcised men have morethan twice the risk of acquiring HIV than do circumcised men.In the study, published in the Feb. 15 issue of The Journal ofInfectious Diseases, now available online, Jared Baeten ...

The secret lives of whales

...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 times larger than other estimates. This information is ...

Mitochondrial DNA mutations play significant role in prostate cancer

...found that COI mutations were common inthe general population (7.8 percent), but very infrequent (<2percent) in men without prostate cancer, the investigators noted thatmen harboring these mutations are at increased risk for developingprostate cancer."We believe this study provides convincing evidence that m...

Antibiotic Resistant Bacterium Uses Sonar-like Strategy to “See?Enemies or Prey

...ture and adapt a similar strategy to help theaging population cope with loss of vision,?says Gilmore.“Secondly, this discovery will help us to develop new ways to treatinfections that are resistant to antibiotics, making them less severe.Based on an understanding of how this toxin system works, we hope todevelo...

Genetically modified natural killer immune cells attack, kill leukemia cells

...tory technique for rapidly producing a large, pure population of NK cells from a small sample of blood; and deve...ls quickly stimulated the expansion of the NK cell population to more than10,000 times their original number. The technique triggered growth of NK cells specifica...

Ants Genetic Engineering Leads To Species Interdependency

...rkers at all, ahandicap that would lead to certain population failure in the field.The new findings suggest that specialization involving reliance oninterspecific hybrid workers has left these species unable to surviveindependently of one another.Sara Helms Cahan, Glennis E. Julian, Steven W. Rissing, TanjaSchw...

Same mutation aided evolution in many fish species, Stanford study finds

...cklebacks evolved from a relatively uniform marine population into today's broad spectrum of shapes and sizes when the last Ice Age ended roughly 10,000 years ago. Because ocean fish quickly evolved into such distinct populations when they colonized new freshwater lakes and streams, they are an ideal model for ...

Introduced foxes transformed vegetation on Aleutian Islands from lush grasslands to tundra

... single offspring each year, so their capacity for population increase is quite low. The foxes are mostly off the islands now, but we will probably continue to see the effects for a long time," Estes said. In addition to Croll and Estes, the authors of the Science paper include UCSC graduate student Eric Danne...

Researchers trace evolution to relatively simple genetic changes

...affect key parts of the molecule. In addition, one population in Japan used the same gene to evolve low armor, but has no changes at all in the protein coding region. Instead, Kingsley said, "the mutations that we have found are, we think, in the (gene's) control regions, which turns the gene on and off on cue....

Octopuses occasionally stroll around on two arms, UC Berkeley biologists report

...affect key parts of the molecule. In addition, one population in Japan used the same gene to evolve low armor, but has no changes at all in the protein coding region. Instead, Kingsley said, "the mutations that we have found are, we think, in the (gene's) control regions, which turns the gene on and off on cue....

Circles Of DNA Might Help Predict Success Of Stem Cell Transplantation

...w stem cell transplant will successfully restore a population of infection-fighting cells called T lymphocytes i...thymus will successfully reconstitute their T cell population using donated stem cells," said Xiaohua Chen, Ph.D., first author of the Blood article. "This kind o...

First real-time view of developing neurons reveals surprises, say Stanford researchers

...en the tiny square moved left to right, a distinct population of neurons turned fluorescent colors to indicate t...square the reverse direction triggered a different population of neurons to light up. "At first we felt like we let some air out of our own tires with this findi...

Study Models Impact Of Anthrax Vaccine

..., theirstudy found that at least 63 percent of the population would need to beimmunized with vaccine before an anthrax attack, which might not bepractical. However, the study found that anthrax vaccination given evenafter an attack could be beneficial in reducing the length of timeantibiotic treatment would be ...

Novel ultrafast laser detection of cancer cells also may improve understanding of stem cells

...emia." Naviaux looks forward to examining a wider population of cancer cells to validate the method, combining the resources of his Center with Sandia's laser expertise. A project proposal has been filed with Sandia to support collaborative work between the unique research capabilities of UCSD and Sandia. "Th...

Tiny scaffolding allows stem cells to become working fat cells

...e implications for dieting and obesity, a person's population of fat cells has other vital roles. Fat cells extract lipids, or fatty acids, from the bloodstream. They also become a huge reservoir for glucose as well, and play a role in insulins ability to effectively convert glucose into energy. "If we could ...

UCSD discovery may help extend life of natural pesticide

...ese parasites infect nearly one-third of the human population and pose a significant health problem in developing countries," said Aroian. "Perhaps one-day vertebrate-safe Bt toxins could be used as human therapies against these parasites." Griffitts and Aroian credit the flexibility of the roundworm C. elegan...

TEL2 gene cooperates with MYC gene to provoke B-cell lymphomas

... As the process of apoptosis becomes sluggish, the population of B lymphocytes increases. The greater the number of these cells, the more likely some of them will eliminate their p53 function. Without the ability to commit suicide, these cells will start multiplying entirely out of control. "This is exactly wh...

South America's vast pantanal wetland may become next everglades, UNU experts warn

...economy. "This economic development and consequent population growth, pose a new threat to the Pantanal due to t...lantations of soybean and sugarcane ?all fostering population growth. "The resultant pollution of water and soil from farm chemicals, as well as increasing indus...

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