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Tag: "period" at biology news

Molecular biology fills gaps in knowledge of bat evolution

...ted about 52 to 50 million years ago during a lush period of significant global warming in a region that is now North America. This latest research helps fill gaps in the evolutionary history of one of the most diverse group of mammals on earth and the only mammals capable of powered flight. The fossil rec...

Controversial drug shown to act on brain protein to cut alcohol use

...overy that Ibogaine reduced binge drinking after a period ofabstinence was an exciting finding for us because this is the type ofbehavior in alcoholics for which very few effective drugs exist," Janaksaid.The scientists confirmed in a cell model that Ibogaine stimulated GDNFactivity. Finally, they showed th...

Genome of deadly amoeba shows surprising complexity, evidence of lateral gene transfer

...t least once in 80 percent of 300 children. Over a period of four years, about a third of the children suffered from amebic colitis, an ulceration of the stomach lining. Petri says the genome data will help researchers find more about what makes some people innately resistant to infection by E. histolytica...

Antarctic ice shelf retreats happened before

...shift in ocean currents that occurred after a long period of warmth. Whilst rising air temperatures are beli.... In this case it's possible that a preceding warm period may have primed the ice shelf to disintegrate when the ocean currents shifted.' The scientists anal...

Combination therapy boosts effectiveness of telomere-directed cancer cell death

... Consequently,this strategy would shorten the time period of drug treatment that isrequired for the onset of telomere crisis and reduce the potential riskof acquired drug resistance, " writes Dr. Seimiya.Hiroyuki Seimiya, Yukiko Muramatsu, Tomokazu Ohishi, and TakashiTsuruo: "Tankyrase 1 as a target for tel...

GATA: a graphic alignment tool for comparative sequence analysis

... Consequently,this strategy would shorten the time period of drug treatment that isrequired for the onset of telomere crisis and reduce the potential riskof acquired drug resistance, " writes Dr. Seimiya.Hiroyuki Seimiya, Yukiko Muramatsu, Tomokazu Ohishi, and TakashiTsuruo: "Tankyrase 1 as a target for tel...

U of M researcher examines newly emerging deadly disease

...served in the Minneapolis-St. Paul area during the period of 2000-2004, four of the patients were previously healthy and four of the patients were women. Schlievert and colleagues hypothesize that the clinical features of purpura fulminans and toxic shock syndrome seen in these patients resulted from massiv...

New Clues Add 40,000 Years to Age of Human Species

...d the Omo hominids, true Homo sapiens, to a single period in time. “Some have considered Omo I to be more ...he researchers linked the isotopic ages to a brief period during which sediments entombed both sets of bones. Together, the various lines of evidence seem to...

Experiments provide proof of how traveling in groups protects insects

...the other hand, we found no deaths during the same period among the crickets we monitored that stayed with the band." That individuals removed from the group suffered gory deaths was clear from partially chewed transmitters the scientists recovered, often with body parts still attached, Lorch said. Researc...

Experiments provide proof of how traveling in groups protects insects

...the other hand, we found no deaths during the same period among the crickets we monitored that stayed with the band." That individuals removed from the group suffered gory deaths was clear from partially chewed transmitters the scientists recovered, often with body parts still attached, Lorch said. Researc...

Why do insects stop 'breathing'? To avoid damage from too much oxygen, say researchers

...ncentration environment, the insect breathes for a period of time and releases a burst of carbon dioxide. It then closes its respiratory system, blocking off more intake of oxygen, to maintain the internal oxygen concentration at 4-5 kilopascals, the right oxygen concentration for its body. In a low-oxygen ...

MSI releases 'moleculizer' - a new approach to simulation of intracellular biochemical networks

... aidbiologists in viewing cellular activity over a period of time, bytaking advantage of the power of computers to generate the thousands ofpotential protein complexes and reactions that cells are able togenerate.The Molecular Sciences Institute is an independent nonprofit researchlaboratory that combines g...

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

Scientists have believed that neurons need a long period of fine-tuning and training with other neurons bef... supported the prevailing idea that neurons need a period of fine-tuning before establishing their final identity. Still, the experiments mark the first time...

Study Models Impact Of Anthrax Vaccine

...anthrax vaccine requires six doses over an18-month period to provide immunity. The researchers looked at whatimpact a new and improved anthrax vaccine could have, and evaluated arange of vaccine characteristics, which could begin to provide immunityranging between 7 and 28 days. When vaccine was distributed...

World's largest rainforest drying experiment completes first phase

...oms of drought stress. By the end of the five-year period of exclusion, many trees in the forest were drawin...end of the dry season of 2000, following the first period of rainfall exclusion, as the trees of similar size continued to grow in the "control" forest plot. ...

Ophthalmologists Use Artificial Silicon Retina Microchip To Treat Vision Loss

...n over the device, and close the incisions. Over a period of 1 week the air bubble is resorbed and replaced by fluids created within the eye. According to Chow, "The use of the subretinal space to hold a device that artificially stimulates the retina seems a logical step in replacing the loss of photorecep...

Sexual cooperation: Mating increases longevity in ant queens

... queens in social species mate only during a short period early in life and store and use the sperm of their mate for the rest of their lives. Sexual offspring are only produced after several months or years of colony growth, during which a sterile worker force is built up in the population. The fact that m...

Ophthalmologists implant five patients with artificial silicon retina microchip

...n over the device, and close the incisions. Over a period of 1 week the air bubble is resorbed and replaced by fluids created within the eye. According to Chow, "The use of the subretinal space to hold a device that artificially stimulates the retina seems a logical step in replacing the loss of photorecep...

Use of PET can reduce, may eliminate more strenuous drug development trials with animals

...s on the same living animal can be extended over a period of time, allowing researchers to follow the development of disease in one subject and to monitor the effects of interventions on disease progression and outcome. Crucial information can be obtained noninvasively, repeatedly and quantitatively in the ...

Drug-resistant bacteria on poultry products differ by brand

...e may persist in the food supply for a substantial period of time even after antibiotic use is discontinued," said Price. "Assuming that what we are observing are lingering resistant strains rather than the result of continued drug use, then one has to conclude that fluoroquinolone use in poultry production...

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