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Tag: "average" at biology news

One species, many genomes

...ens or infections, are much more variable than the average gene. "The genetic variability appears to reflect adaptation of local circumstances," says Weigel. It is likely that such variable genes allow plants to withstand dry or wet, hot or cold conditions, or make use of short and long growing seasons. Su...

Releasing fish for the future

...oked yellowfin bream then shed their hooks over an average of three weeks”, he said. ...

Cigarette smoke alters DNA in sperm, genetic damage could pass to offspring

...sed on blood levels of tobacco by-products – of an average human smoker, according to research previously published by one of the study's co-authors. Yauk and her colleagues found that the rate of Ms6-hm mutations in the smoking mice were 1.4 times higher than that of non-smoking mice at six weeks, and 1....

How to lose weight and not go hungry: HU researcher develops drug that mimics feeling of 'fullness'

...dosages, the mice weighed 40 percent less than the average for mice of their size and age who were not being given the compound. The peptide has been patented in Europe and the U.S., and a commercial firm, Bioline RX Ltd. Of Jerusalem has purchased development rights from Yissum, the Hebrew University’s...

Longer treatment benefits sleep apnea patients

... current study, for example, patients used CPAP on average about 5 hours a night. The researchers found that although daytime sleepiness could be improved after 4 hours to 6 hours a night, depending on the measurement used, functional status or quality-of-life improvements were maximized after 7.5 hours of u...

Warning from Asian bees

...t 12 months, which will lead to a yield well below average in the Australian honey crop over the next 12 months to two years.” All sections of the local industry accept that the arrival of destructor in Australia is a matter of when, not if, and its effects would be far more dramatic than a wide incursion...

Runners -- Let thirst be your guide

...ivities of 4 hours in duration or longer. But “the average person who goes out for an hour or two of strenuous exercise is not going to be at risk for this,” he adds. Verbalis also says that sports drinks, which contain some sodium and potassium and carbohydrates, are basically water with a few additives....

Mutating the entire genome

...s bred with a normal mouse. In a “remarkably high” average of 10 percent of the offspring, the desired large stretch of DNA is either deleted or duplicated so scientists can see what goes wrong in the mutant mouse and thus learn the normal job of that piece of DNA. Capecchi says the same method also can ...

Gene therapy study shows safety and statistically significant improvement in Parkinson's disease

...e (p<0.005). Nine of the 12 patients showed an average of 37% and five of these patients had substantial improvement of between 40% and 65%. Clinical improvement also correlated well to metabolic changes in glucose utilization as measured by PET scan. The PET scan data revealed a significant improvement ...

Ants show us how to make super-highways

...rall, this behaviour results in an increase in the average speed of prey-laden traffic. Moreover, calculations suggest that under a range of realistic scenarios, plugging behaviour results in a clear increase in daily prey intake. In other words, the behaviour of the pothole pluggers more than compensates fo...

Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems

...s the world. The two biologists concluded that an average acre of mainland contains 52 lizards while an island acre contains 777 lizards. This difference in density persisted when the scientists controlled for location and environmental conditions. “The ecology of islands is particularly important becau...

US control strategies may make flu epidemics worse, UCLA study shows

...vention, 5 to 20 percent of the U.S. population on average will come down with it. About 36,000 people will die. But among health experts, a bigger concern than the seasonal flu is an outright flu pandemic, such as a human strain of avian flu. And officials say it is not a question of if such a health crisi...

Role of noise in neurons

...3 by using incredibly thin axons as wires, with an average diameter of 0.3 micrometers (1ìm is one millionth of a meter). Although, as in computer chips, this miniaturization economizes on space and energy, it increases the noise introduced by thermodynamic fluctuations in a neuron's voltage-gated ion channe...

Cancer patients monitor fatigue in real time

... professor and lead researcher of the study, or to average their symptom experiences. "Their mood may affect their recall. They may have been experiencing pain in addition to fatigue, and that affects how they remember the fatigue experience," she said. In Hacker's study, patients used a device that is...

Risk of lymphoma increases with hepatitis C virus infection

...ent), the majority of patients were white, and the average age was 52 years. Patients in the HCV-infected group were more likely to have served during the Vietnam era (1964-1975) than were uninfected patients in the comparison group. Previous studies found that the prevalence of HCV infection is much h...

Percutaneous aortic valve replacement safe, successful in high-risk patients

..., the patients were placed on a bypass pump for an average of 30?0 minutes to minimize blood flow through the...lve. Follow-up in the 11 survivors showed that the average aortic valve area more than doubled, on average, following the procedure. In addition, the severity ...

100 percent of pregnant women have at least one kind of pesticide in their placenta

... at least one pesticide in their placenta, but the average rate amounts to eight different kinds of chemical ...e, the most prevalent was endosulfan-diol, with an average concentration of 4.15 nanograms per gram of placenta (156.73 ng/g lipid). Surprisingly, the UGR rese...

DNA analysis suggests under-reported kills of threatened whales

...hs between surveys," Baker pointed out. "Since the average market 'half-life' of whale meat is six weeks, at most, we should have found far fewer individuals ?or the number of whales killed is actually much greater than is being reported." To estimate the true number of whales in trade, the researchers us...

Switching genes to overdrive improves muscular dystrophy symptoms in mice

... live births of boys, and is ultimately fatal. The average age of death is the mid-teens, and most patients die by their 30s. In the United States, about 400 to 600 boys are born each year with DMD or Becker Muscular Dystrophy, a milder form of the disease. The cause is a mutation, either inherited or occurr...

UCLA study uncovers clues for why Graves' disease attacks the eyes

...strikes during the childbearing years, and runs an average course of one to two years. No cure exists, though surgery can be done at the end stage to correct disfigurement....

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