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Tag: "population" at biology news

Scientists look to the Bahamas as a model for coral reef conservation

...cers or cancer. At least 80 percent of the world's population is infected with H. pylori yet has no overt symptoms. What makes the study of H. pylori even more perplexing is that as such advances as clean water and pasteurization are adopted, the prevalence of H. pylori infection has declined. On the one hand,...

Alcoholism, smoking and genetics among Plains American Indians

...sm allele." "Here you've got one gene, and in one population one allele of the gene is associated with a disease, alcoholism, yet in another population, the gene's other allele is associated with that disease," she said. "You've really got to look at the gene-environment interaction when you've got a gene lik...

Satellites show Amazon parks, indigenous reserves stop forest clearing

...national society. There was no correlation between population density in indigenous areas and inhibition of deforestation. In much of the Amazon, not only can protecting nature be reconciled with human habitation ?it wouldn't happen without the people. Extensive intact forests on indigenous territories are c...

Climate change: The rice genome to the rescue

...ause rice production feeds almost half the world's population while providing vital employment to millions as well, with most of them being very poor and vulnerable." For these reasons, Dr. Zeigler announced at the workshop that IRRI ?in an unprecedented move ?was ready to put up US$2 million of its own resear...

Evolutionary biology research techniques predict cancer

...agues report that precancerous tumors containing a population of highly diverse cells were more likely to evolve...apy sometimes fails. If a tumor contains a diverse population of cells, some of those cells are more likely to resist treatment, Maley says. Adapting to and survi...

Cure for cancer worth $50 trillion

...the quality of life," explain the authors. "As the population grows, as incomes grow, and as the baby-boom gener...rom 1970 to 2000 had an economic value to the U.S. population of $3.2 trillion per year. ...

Researchers create pigs that produce heart-healthy omega-3 fatty acids

...agues report that precancerous tumors containing a population of highly diverse cells were more likely to evolve...apy sometimes fails. If a tumor contains a diverse population of cells, some of those cells are more likely to resist treatment, Maley says. Adapting to and survi...

Mute swan population helps explain longstanding evolutionary question

...ction, inheritance, and evolution in the mute swan population of Abbotsbury, England, yielded data on clutch size consistent with the direction predicted by evolutionary theory. "In this study population, clutch size shows a clear response to selection, providing us with a clear illustration of microevolutiona...

Horseshoe crab decline threatens shorebird species

...ime, there has been a great reduction in the total population of red knots, the report notes. "The number of horseshoe crab eggs was the most important factor determining the use of the beaches by red knots. The availability of horseshoe crab eggs was even more influential than the presence of human disturbance...

Genetic study shows humans have pushed orangutans to the brink of extinction

...grams depends on determining when the decline of a population began, its trajectory, and the original population size." For their study, the researchers collected hair from tree nests and feces found under nest...

Skin disease common among Hispanic farmworkers in North Carolina, research shows

.... "These workers represent a medically underserved population that is at risk for both environmental and occupational health problems, as well as health problems associated with poverty." An estimated 4.2 million seasonal and migrant farmworkers and their families live in the United States. Most farmworkers ar...

Scientists discover interplay between genes and viruses in tiny ocean plankton

...ticular environment. "This would allow the overall population to persist despite complex and unpredictable envir...ochlorococcus in the oceans, which maintain steady population sizes over vast regions of the sea," she said. ...

Boosting newborns' immune responses

... vaccine at birth, a much higher percentage of the population can be covered." Conceivably, TLR8 stimulators could also be given alone in special circumstances ?to help a baby fight off an infection in progress, or as a preventive measure in the event of a disease outbreak or bio-terrorist threat, Levy adds. ...

Marine mammals are on the frontline of failing ocean health

... the US: estimates indicate that up to 25% of the population may be infected with the parasite, but people rarely show symptoms or are simply hit with a flu-like illness. However, if women are infected when they are pregnant, it can lead to miscarriages or developmental problems in the fetus, most often affect...

Invasive species harms native hardwoods by killing soil fungus

...ross the globe," says Kristina A. Stinson, a plant population biologist at the Harvard Forest, Harvard's ecology and conservation center in Petersham, Mass. "In North America, thousands of nonnative plants and animals have become established since European settlement and many more continue to be introduced. Som...

Ocean virus identified in human blood samples

...disease. In another study to be published soon, a population of Thoroughbred mares on horse farms in Kentucky, which was having an unusually high level of spontaneous abortions, was also found to have 81 percent positive testing for Vesivirus antibodies ?far higher than a normal population. Because of its end...

Ernst Mayr's theory illustrated in genetic epidemiology studies

... nature of genetic drift. But an evolutionary and population biologist at Washington University in St. Louis sa...in recent years in human genetic epidemiology and population biology studies. Alan R. Templeton, Ph.D., Washington University professor of biology in Arts &...

Natural selection at single gene demonstrated

...n asked. "We know something more now about how the population has been structured." The standard neutral model makes improbable assumptions about population structure, such as assigning each individual an equal chance of reproducing. Co-author Magnus Nordb...

World faces challenge as life expectancies lengthen, scientist says

... relationships between historical trends in aging, population growth and economic activity. His analysis combine...seems to have thought of, is that the total global population increases dramatically. From an original projection of 8 billion we end up topping out at 10 to 11 b...

MIT: Oceans are a major gene swap-meet for plankton

...ticular environment. This should allow the overall population to persist despite complex and unpredictable envir...chlorococcus in the oceans, which maintains steady population sizes over vast regions" of the sea. The collective Prochlorococcus community merely adjusts intern...

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