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Tag: "fewer" at biology news

Shift of weather patterns necessitates rethinking of reforestation methods

...e survival rate is higher and landowners can plant fewer trees to get the same stand density. On wet years, when a high percentage of bare root seedlings do survive, landowners find themselves paying for costly thinnings, Taylor said. Taylor's research is being conducted near the Texas A&M University...

A puzzle piece found in unraveling the wiring of the brain

...rve cells form billions of contacts when there are fewer than 30,000 human genes is still a scientific mystery. A team headed by Drs. Robin Hiesinger and Hugo J. Bellen at Baylor College of Medicine in Houston have unraveled a piece of that puzzle by finding a gene that plays a key role in brain wiring. A...

Duke engineers develop new 3-D cardiac imaging probe

...enough to encompass the whole volume of the heart, fewer "pictures" need to be taken. This may shorten patient time in clinics, he said. ...

Cooperation is key—a new way of looking at MicroRNA and how it controls gene expression

...his didn't work. The homology searches yielded far fewer targets than expected and could not account for all known microRNAs. The reason, says Han, is that scientists were trying to predict the microRNA targets using the sequence homology of the full-length microRNAs. In their Cell article, Han and his co...

Measuring hormone cuts antibiotic use in half in pneumonia patients

...he cost of antibiotics, it's always better to give fewer antibiotics," Prof. Tamm said. Many cases of community-acquired pneumonia are caused by bacteria, which require treatment with antibiotics, but some cases are viral, which get better without antibiotics. But doctors don't like to delay treatment in ...

Genetic therapy reverses nervous system damage in animal model of inherited human disease

...d cats, with better balance and muscle control and fewer tremors." Although the disease itself is rare, AMD is one of about 50 lysosomal storage diseases, a class of diseases that accounts for a significant portion of the instances of mental retardation in children. Other examples include Tay-Sachs diseas...

Study reveals dramatic difference between breast cancers in US and Africa

...and 19 percent of Africans. Breast cancer strikes fewer women in Africa, "but it hits earlier and harder," said Olopade. In America, most breast cancer occurs after menopause, usually in the late 50s or 60s. In Africa, it most often strikes women in their 40s. The average age of the African women in this ...

Taking the piste out of Alpine vegetation

...hat, compared with off-piste plots, there were 11% fewer plant species on ski pistes, with woody plants and early-flowering species being most badly affected. Machine grading of ski slopes caused most damage to vegetation, with machine-graded slopes having five times more bare ground than ungraded pistes....

Elephant seal pups suffer from ocean warming

..., they gain less body mass while pregnant and have fewer reserves to draw on during nursing. Nursing pups get all nourishment from their mothers; changes in ocean temperature therefore directly affect the weight, and the survival rate, of the pups. To assess the impact of temperature changes on food avail...

Retrovirus struck ancestors of chimpanzees and gorillas millions of years ago, but did not affect ancestral humans

...rt out most of its genetic variation in relatively fewer generations than would a larger group. This would lead to a higher probability of rare genetic variants becoming fixed in a short time. Before long, a genetically disparate population, possibly with wide variations in morphology, would have emerged, ...

Making Sure Sacred Sheep Don't Become Extinct

...977, when conservation efforts started, there were fewer than 500. Now the estimates are around 1,500.—By David Elstein, Agricultural Research Service Information Staff. This research is part of Food Animal Production, an ARS National Program (#101) described on the World Wide Web at www.nps.ars.usda.gov....

Butterfly migration could be largest known

...ry year, but usually less conspicuously and in far fewer numbers. This year, however, exceptionally high winter rainfall in southern California has created a bumper crop of plants for the caterpillars to eat, fuelling a population boom, Shapiro said. The butterflies take about three days to reach the Cent...

Single-donor Islet Transplantation Procedure Shows Promise For Patients With Type 1 Diabetes

...ustained insulin independence) using significantly fewer islets," the authors write. "These findings may have implications for the ongoing transition of islet transplantation from clinical investigation to routine clinical care." "While these findings may suggest a distinct advance in islet transplantatio...

Life detection instrument passes key test on road to Mars

...ts high bioorganic levels. That means they'll need fewer channels on the instrument that travels to Mars, and the scanner used to read out the data needn't be as elaborate. This translates into a cheaper and easier way to build instruments, but more importantly, an instrument that is smaller and uses less ...

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

... planning a pregnancy or who had been pregnant for fewer than 12 weeks. They collected extensive information on the volunteers, including their patterns of water use such as drinking and bathing and what later happened with their pregnancies and births. Among tests the women underwent were ultrasound exami...

Antiretroviral Therapy May Prevent HIV Transmission From Breastfeeding Mothers To Infants

... of the women receiving antiretroviral therapy had fewer than 50 copies/ml of HIV-1 RNA in their breast milk, compared with 36 percent of the women not taking therapy. This represents a statistically significant difference. However, there was no such difference for HIV-1 DNA, which some studies suggest al...

Brain Scan Study of Smokers Reveals Signature of Craving

...moking or a pack of cigarettes. Smokers who noted fewer cravings showed stable brain responses to the same drug cues, despite hours of deprivation. The findings suggest important differences among smokers in brain responses that underlie the smoking habit, the researchers said. What's more, they added, s...

Studies reveal how plague disables immune system, and how to exploit the process to make a vaccine

..., the plague has not entirely gone away. There are fewer than 2,000 cases a year worldwide, including 10 to 20 each year in the western United States. One out of seven persons infected dies, even with aggressive treatment. Since 2001, however, many people have worried that terrorists could exploit Y. pest...

UNC plant researchers discover proteins interact to form hair-trigger protection against invaders

...ems to make them more resistant to pathogens using fewer expensive and polluting chemicals." A report on the findings appears in this week's edition (June 24) of Science Express, the online, early-release version of the journal Science. Other authors are postdoctoral fellow Dr. Ben F. Holt III and Ph.D. s...

FDA approves more generic AIDS drugs

...ems to make them more resistant to pathogens using fewer expensive and polluting chemicals." A report on the findings appears in this week's edition (June 24) of Science Express, the online, early-release version of the journal Science. Other authors are postdoctoral fellow Dr. Ben F. Holt III and Ph.D. s...

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