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Tag: "population" at biology news

Researchers Identify Cause of Early Bird Sleep Disorder

... very small number (about .3 percent) of the human population seems to have this "circadian clock" shift. And in earlier research, Ptacek and his colleagues had discovered an entirely different gene that causes a similar clock-shift. Both arise because of so-called point mutations in the genes. This means that ...

NCI Researchers Confirm the Effectiveness of Immunotherapy Approach to Treating Melanoma

...ngs published in 2002** were in an initial patient population of 13 and these new findings represent almost a three-fold increase in patient numbers. Thirty-five patients with melanoma that had progressed throughout the body were chosen for the study. The patients had not responded successfully when treated wi...

Major new UNC-based drinking water study suggests pregnancy fears may be overstated

...t had come before. "The vast majority of the U.S. population is living with these exposures to drinking water byproducts," Savitz said. "If they clearly increased women's miscarriage rates, that would be a very big, very expensive problem to solve. Reducing exposure would be quite expensive for the water utili...

Understanding how bacteria communicate may help scientists prevent disease

...is bioluminescence. Scientists noticed that once a population or colony of particular bacteria reached a certain size, the colony began to emit light. "Now many people realize that other important activities also depend upon a quorum, such as biofilm formation, releasing toxins, or becoming a virulent invader,"...

Ocean climate predicts elk population in Canadian Rockies

...ate is more complex. Hebblewhite analyzed the elk population in Banff National Park from 1985 to 2000 and cross... found that positive NPO values translate into elk population declines in the park. Severe weather in the mountains means colder and snowier conditions than usua...

Fungus-farming termites descend from an African rain forest Eve

...ble areas more effectively and to reach far higher population densities than each of their non-agricultural relatives can alone. Furthermore, besides their agricultural proficiency, fungus-farming termites resemble humans in another respect: just like the human female ancestor was African, so was the 'Eve' of f...

Poaching, logging, and outbreaks of Ebola threaten central African gorillas and chimpanzees

...While the experts were unable to establish precise population figures for the gorillas and chimpanzees, they determined that recent Ebola outbreaks, bushmeat hunting and logging have almost wiped out some populations. The action plan noted that apes reproduce slowly, with limited capacity to recover from decima...

Enlisting genomics to understand flu evolution

...ultiple strains of the flu virus, circulating in a population at the same time, can reshuffle their genes and create a new virus, one capable of infecting many more people, according to a new study in the open-access journal PLoS Biology. This finding may help scientists make better predictions about which vira...

Male Combat Veterans Rank High In Heart Disease Risk

.... White males represented 80 percent of this study population and black males, 20 percent. The men were 44 to 66...ombat veterans represented 22 percent of the study population (1,183); non-combat veterans represented 40 percent (2,131); and non-veterans represented 38 percent...

Study: Harmless virus kills some cancers

...s type 2 (AAV2), which infects the majority of the population but has no known ill effects, kills multiple types of cancer cells yet has no effect on healthy cells," said Craig Meyers, Ph.D., professor of microbiology and immunology, Penn State College of Medicine, Penn State Milton S. Hershey Medical Center. "...

Drug Offers Alternative to Surgical Treatment After Miscarriage

...child, and family health; reproductive biology and population issues; and medical rehabilitation. The National Institutes of Health (NIH) ?The Nation's Medical Research Agency ?is comprised of 27 Institutes and Centers and is a component of the U. S. Department of Health and Human Services. It is the primary F...

Sleeping Sickness Epidemic Spreading in Uganda

...child, and family health; reproductive biology and population issues; and medical rehabilitation. The National Institutes of Health (NIH) ?The Nation's Medical Research Agency ?is comprised of 27 Institutes and Centers and is a component of the U. S. Department of Health and Human Services. It is the primary F...

Harmless virus may hold key to more effective HIV drug discovery

... an HIV protein called Nef. Knowing how the entire population of Nef variants responds to new drugs gives resear...he specific compounds that could target the entire population of Nef mutational variants. The results suggest chemically simpler, more flexible compounds could be...

FSU scientist warns North Atlantic right whale facing extinction

...that of the Southern Hemisphere right whale, whose population is estimated to be more than 10,000 and is increasing at approximately 7.2 percent per year. While there have been efforts to minimize the risk of ship strikes -- mandatory ship location reporting, extensive aerial survey efforts and mariner educati...

Scientists to mimic nature for newest cancer drugs

...that of the Southern Hemisphere right whale, whose population is estimated to be more than 10,000 and is increasing at approximately 7.2 percent per year. While there have been efforts to minimize the risk of ship strikes -- mandatory ship location reporting, extensive aerial survey efforts and mariner educati...

Gifts from the sea

...year. During a typical MBL summer, the year-round population swells from 275 to over a thousand. Scientists from more than 133 universities and institutions in more than a dozen countries make the MBL their summer research headquarters each year. U.S. and foreign students seeking intense, specialized science ...

Size matters: Preventing large mammal extinction

...ine and extinction. Biological traits such as low population density, slow life history, late weaning age and extended gestation in mammals above a certain size means they are evolutionarily disadvantaged in the face of human impact, compared to species of smaller size. Large mammals may therefore need a more ...

Plankton can run, but can't hide from basking sharks

...rk Rhincodon typus and the basking shark, have low population levels as a result of human exploitation. Data on population sizes for these species are lacking, and diving behaviour is one factor contributing to surveying bi...

Siberian tigers hang tough

...e slightly, but we think it's safe to say that the population appears stable." ...

Millennium Ecosystem Assessment: Many of 2 billion dryland dwellers at risk as land degrades

...nal and global climate change. "Given the size of population in drylands, the number of people affected by dese...duced range quality. The lesson is that increasing population pressure not accompanied by management practices compatible with the new population size, is the cau...

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