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Tag: "observed" at biology news

Genetic testing still smart choice, despite uncertainties

...say. "Our pathway concept may help to explain the observed outcomes during preimplantation diagnosis," said Kenneth Drury, Ph.D., director of the UF IVF and Andrology Laboratory and a clinical professor in the College of Medicine who was one of the researchers. "When we biopsy an eight-cell embryo, if we cho...

Team led by Carnegie Mellon University scientist finds first evidence of a living memory trace

...id Galán. "All previous studies in this field have observed only a sustained, non-specific increase in neural activity after a living animal is repeatedly exposed to a stimulus. These investigations haven't retrieved a signature of a stimulus, whereas we have." The experiments were performed in the laborato...

Genetic analysis of cavefish reveals more about evolution

...r the most common form of albinism in humans. They observed different deletions in the gene in each population and found that both deletions cause a loss of Oca2's functionality, demonstrating that the albinism in the two groups evolved independently. The findings are reported in the latest issue of the journ...

Evolutionary conservation of a mechanism of longevity from worms to mammals

...f reducing clk-1/mclk1 activity that was initially observed in C. elegans is conserved in mice, supporting the idea that some molecular mechanisms of aging are shared throughout the animal kingdom." ...

'Perception' gene tracked humanity's evolution, scientists say

...impanzee prodynorphin gene. Past research has also observed variation in expression levels within humans. This report supports a growing consensus among evolutionary anthropologists that hominid divergence from the other great apes was fueled not by the origin of new genes, but by the quickening (or slowing...

Researchers show key protein necessary for normal development of red blood cells

...onic red blood cells in a mouse model. Researchers observed that KLF2 is responsible for controlling and "turning on" the embryonic globin gene. "Understanding how genes are turned on and off, and the switch from the embryonic globin gene to the adult beta-globin gene has clinical relevance to treatment of s...

Marathon of nano-sprinters

... these filaments, and the movement of the beads is observed under the microscope. One important result of these experiments is that molecular motors, unlike railways or cars, have a strong tendency to fall off their track and diffuse away into the surrounding aqueous solution. This is a direct consequence ...

Wild Gorillas Handy with a Stick

... behaviors of their keepers, tool use had not been observed for gorillas in the wild. (Chimps famously use sti...afy twigs to swat away bees.) That no one has ever observed wild gorillas using tools—despite decades of intensive study—prompted scientists to speculate that g...

Health of coral reefs detected from orbit

...ERIS Full Resolution mode results, they found that observed changes in live coral cover were correlated to an existing bleaching event. Theoretical studies indicate that for each complete 300-metre pixel of coral under one metre of water it is possible to detect a 2% bleaching of live coral. MERIS should re...

Phenotype is influenced by nature, nurture and noise

...e details of gene regulation explains not only the observed variability of cells, but also, in a larger sense, why identical twins don't necessarily have identical fingerprints," said Hasty. "Given that every potential feature of an organism is ultimately determined at the genetic level, it is important to zo...

Algal protein in worm neurons allows remote control of behavior by light

...ological experiments to show that the effects they observed were indeed due to the inward flow of ions caused by activation of the ChR2 protein by light; this inward ion flow persisted for the duration of blue-light exposure. Future work may include studies using forms of ChR2 or related proteins that are s...

Scientist uses form to explain function of key building blocks of life

...s involved in exploring something that hasn't been observed before," he says. ...

Overfishing may drive endangered seabird to rely upon lower quality food

...y have played a role in low levels of reproduction observed in contemporary murrelet populations, and has likely contributed to the seabirds' listing as an endangered species, the researchers said. "The dietary patterns of today's marbled murrelets might be artifacts of the profound changes that coastal mari...

Worms know bad food when they smell it

... to the brain. Similar forms of learning have been observed in a broad range of animals, including invertebrates such as snails and fish. "We don't know if they feel nauseous," Bargmann said, "but we do know that they will learn to reject the food that's made them ill." The group carried out further experim...

A resetting signal keeps circadian rhythm on track in Drosophila fruit flies

...looking over several days, only one period will be observed ?the one dictated by the morning clock," Stoleru said. Research by the same Brandeis team, published last year in Nature, had shown that two distinct groups of clock neurons determine morning and evening activity. The present study greatly advanced...

No link found between caffeine intake and development of hypertension in women

... consumption and risk of incident hypertension was observed after multivariate adjustment. When studying individual classes of caffeinated beverages, habitual coffee consumption was not associated with increased risk of hypertension. By contrast, consumption of cola beverages was associated with an increased ...

Microbes under Greenland Ice may be preview of what scientists find under Mars' surface

... frozen and barely active, could have produced the observed amount of excess methane in the ice. "We found me...ght from the sun would have broken down the amount observed in about 300 years if some process was not replenishing the methane, Price noted. While interaction ...

Phenolic compounds may explain Mediterranean diet benefits

...in the nitric oxide bioavailability are behind the observed improvement in ischemic reactive hyperemia," Dr. Pérez Jiménez said. Dr. Pérez Jiménez said that olive oil may be superior to seed oils because it is a natural juice, pressed from the olives, so it does not go through the type of processing needed t...

Hepatitis B accounts for 40 percent of 'missing' Asian women

...e ratios in many Asian countries. It has long been observed that the relative number of males is higher in cer...omy, Oster proposes an explanation for some of the observed over-representation of males: the hepatitis B virus. She presents new evidence, consistent with exis...

Common alternative treatment for liver disease is found to be ineffective

...us placebo treatment. No significant effects were observed on mortality or complication of the disease. Further, milk thistle was not associated with any significant risk of adverse events. "It would be logical to stop the use of milk thistle products, not to reimburse any use, to stop the information that...

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