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Tag: "rates" at biology news

Cortex matures faster in youth with highest IQ

... teen years, the superior group showed the highest rates of change. "Brainy children are not cleverer solely by virtue of having more or less gray matter at any one age," explained Rapoport. "Rather, IQ is related to the dynamics of cortex maturation."The observed differences are consistent with findings...

Liver cancer linked to cellular repair pathway

... 2005 and 15,420 deaths. One reason for the rising rates is the increasing prevalence of obesity, which raises the risk of liver cancer five- to six-fold, said Anna Mae Diehl, M.D., chief of Duke's gastroenterology division and senior author on the study. The liver's attempts to repair itself and regenera...

Newly identified mechanism helps explain why people of African descent are more vulnerable to TB

...foreign-born populations have significantly higher rates of TB than the overall U.S. average, according to ...Prevention. In 2004, African Americans had TB case rates that were eight times higher than whites. Scientists have understood that mice -- a frequently used...

Of mice, men, trees and the global carbon cycle

...y also reveals that the respiration, or metabolic, rates of plants and animals follow different laws of scaling with respect to body size. The work will be published in the Jan. 26 issue of the journal Nature. In revealing nitrogen content as the key to plant metabolic rates, the work uncovered a fundamen...

Taking a bite out of a fellow worker helps wasps recruit new foragers

...percent for these recruited foragers, while biting rates did not increase for other workers. "The fact that biting was specifically directed at recruited foragers shows that biting is the mechanism that the colonies used to activate new foragers," said O'Donnell. "With no water, food and building materia...

Tiny polyps gorge themselves to survive coral bleaching

...of tests measuring energy reserves, photosynthetic rates and growth rates of the coral. The results showed that both Porites and Montipora used up their internal energy reser...

Satellites show Amazon parks, indigenous reserves stop forest clearing

...cent outside their borders had inner deforestation rates of 0.75 percent or less. Few parks are located in active frontier areas (4 of 15 in the sample) than indigenous lands (33 of 38). But parks' and indigenous lands' ability to inhibit deforestation appear similar. Indigenous lands occupy one-fifth of...

Sexual reproduction delays aging in a mammalian species

...s the rare opportunity to study differential aging rates among individuals possessing the same genes and experiencing the same environmental conditions, apparently differing only in the aspect of pair-bonding and engaging in sexual activity. ...

Ebola DNA vaccine produces immune responses in all fully vaccinated volunteers in Phase 1 trial

...ry gene sequences used in the vaccine. "The high rates of immune responses at all dose levels in this initial human Ebola vaccine study support continued development of this vaccine and further evaluation of our technology for potential additional biodefense and emerging disease applications," said David...

UCLA scientists find male gene in brain area targeted by Parkinson's

...s that reveal dramatic differences in severity and rates in the genders could depend on the SRY levels in the brain," he said. ...

For one Stanford doctor, the beat goes on during open-heart surgery

...en," Ihnken said. "Women have double the mortality rates following bypass." Besides his own positive experiences with the technique, Ihnken points to a recent report in the new journal Innovations, which presents an analysis by an international group of doctors of more than 150 previous studies of the pro...

High-tech tags on marine animals yield valuable data for biologists and oceanographers

... us things like the thermal properties and cooling rates of the ocean and the structure of the water column, and they can often get valuable data that would be hard to collect by other means," Costa said. ...

UCSD biologists find new evidence for one-way evolution

...ecies that possess it, perhaps in terms of reduced rates of extinction." ...

Fertility drugs given 'all-clear' in new study

...tatistically significant difference in the overall rates of major and minor malformations or chromosomal ab... much smaller study linking letrozole to increased rates of inherited malformations. This study led to widespread concern about the use of letrozole, a drug ...

Ethiopian development raises birth rate

...children (in terms of weight and height) and birth rates in villages where tapped water had been introduced and others where it had not. While previously, women had to walk up to 30 km to fetch their families' water, the new water supply reduced the time spent carrying water each day from around three hou...

Scientists discover basic defect in cystic fibrosis airway glands

... no evidence that the inhibitors altered secretion rates in either normal or cystic fibrosis glands. This suggested that loss of CFTR-mediated fluid secretion is the culprit in cystic fibrosis. "We previously showed that cystic fibrosis airway glands have defective gland secretion in response to certain ...

Breast implants not associated with cancer risk, study reports

...er incidence of lung cancer may be due to the high rates of smoking in Swedish women with cosmetic breast implants. Lower breast cancer incidence could be explained by the lower body mass index, higher number of births, and younger age at first childbirth observed in the group of women who had undergone b...

Researchers test new way to quit smoking

...ere is a measurable difference in quitting success rates between the two groups in our trial," said Dr Bullen. ...

Gene-specific Ebola therapies protect non-human primates from lethal disease

... virus causes hemorrhagic fever with case fatality rates as high as 80 percent in humans. The virus, which is infectious by aerosol (although more commonly spread through blood and bodily fluids of infected patients), is of concern both as a global health threat and a potential agent of biological warfare ...

Sun protection for plants

...dopsis could be used to improve the photosynthesis rates of staple crops such as rice and the common bean. Professor Julia Goodfellow, BBSRC Chief Executive, commented, "This demonstrates how research into fundamental biological processes has the potential to have a big impact on people's lives around t...

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