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Tag: "four" at biology news

Exploring the molecular origin of blood clot flexibility

...cientists showed that a fibrin fiber could stretch four to five times its original length before snapping. "This is among the most extensible, or stretchy, of polymers that anyone has ever found," says Weisel. "But, how is the stretching happening at a molecular level? We think part of it has to be the un...

Post oak grasshoppers emerging

...mology labs, began noticing the grasshoppers about four years ago. They were crawling up the side of her W...x eggs at a time in a pod, and will produce two to four pods over her lifetime. In the spring, when post oak leaves begin to emerge, the eggs hatch and the ...

Researchers create artificial enzyme that mimics the body's internal engine

...ectron carrier in the transport chain. It receives four electrons from the other carriers and transfers th...ve perfectly," Collman said. "If it adds less than four electrons, it can produce partially reduced oxygen molecules, and these are known to be very toxic."...

Warming oceans threaten Antarctic glaciers

Scientists have identified four Antarctic glaciers that pose a threat to future se...to establish a trend with confidence. In contrast, four major glaciers in East and West Antarctica were shown to be retreating in unison, raising concerns t...

Lost dogs found more often than lost cats, study suggests

...ll or visit to an animal shelter. More than one in four dogs were found because the animal wore a dog license or identification tag at the time of its disappearance. "The animal control system is a key component in the recovery of lost dogs, but owners have to be vigilant about calling and visiting thes...

Erectile dysfunction in diabetes is due to selective defect in the brain

...ontrols. The experiments began on each of the rats four weeks after the injections. Four experiments were conducted. Experiment one examined the effect of L-NMMA on NMDA mediated behavioral responses in normal rats; experiment two measured behavioral responses to NMDA or sodium nitroprusside (SNP), an...

Researchers find 6,000-year-old fossil evidence

...ound evidence of this diet on grinding stones from four ancient households at Real Alto, leading her to conclude that these foods were eaten by everyone, not just the commoners or the elites. ...

Dual gene therapy suppresses lung cancer in preclinical test

...gene combination cut the number of viable cells in four lines of human non-small cell lung cancer by 70 to 80 percent 48 hours after treatment while leaving a control group of normal cells unaffected. The cancer cell lines treated with the gene combination had 2 to 3 times more cells killed by apoptosis t...

Xylitol reduces risk of cavities

...lined dramatically during the trial period. After four weeks, the proportion of caries-producing bacteria was down by a third, but six months afterward the values had returned to the original levels. Despite the relatively high dose of xylitol used, no negative effects were reported, such as stomach tro...

Growth hormone is not the anti-aging bullet for healthy adults

...htly more than two kilograms (that's a little over four pounds) and decreased fat mass by about two kilograms. But it had no other beneficial effects that we could see. "If you went to a gym pretty regularly, you might get that change without breaking into too much of a sweat, and you wouldn't spend $1...

New research says winning a Nobel Prize adds nearly 2 years to your lifespan

...fferences in life span between sexes. They dropped four from that total who died prematurely for non biological reasons - such as active combat in the First World War. That left 524 scientists, of whom 135 actually won a Nobel Prize. The average life span for this group was just over 76 years. Winners ...

Amur leopard still on the brink of extinction, scientists say

...ant thing for the leopards' survival." At least four leopard litters were encountered during the census...table amounts of ungulates, including deer. Two to four female leopards would live in the same amount of land, reproduce and nourish their cubs. "Maybe t...

Antivirals effectively curb influenza virus

...lth and Community Medicine. The report evaluated four household-based, randomized, placebo-controlled clinical trials, conducted from 2000 to 2004, which were designed to estimate the effect of post-exposure antiviral treatment on preventing influenza within households. Two of the trials were conducted ...

Researchers discover genetic cause for word-finding disease

...ffered from PPA. In the first family, three out of four siblings had the disease; in the second family, two out of three had it. These particular mutations were not observed in the healthy siblings or in more than 200 control samples. The study was published in January Archives of Neurology and is disc...

Cancer researchers add spice to research against rare neuromuscular disease

...hat VEGF activity in the neurons went up more than four times in the treated mice compared to untreated mice. The new research is a signal that new avenues for treating conditions like prostate cancer, baldness and Kennedy's disease ?all of which rely on the androgen receptor ?are opening up, thanks to...

Discovery of an HIV inhibitor in human blood points to new drug class

...said. However, the treatments all fall into one of four categories based on their modes of action, and a growing number of HIV strains are becoming drug resistant. HIV resistance to one drug can lead to resistance to other drugs in the same class, a phenomenon known as crossresistance. "You want a l...

Lead with a poisonous electron shield

...at the active centers of the enzyme. If one of the four possible calcium ions of calmodulin is replaced by... anemia. At the active center, a zinc ion binds to four ligands, three of which involve a sulfur atom. When lead replaces zinc, it only binds to the three s...

Gene study shows three distinct groups of chimpanzees

...examined 310 DNA markers from each. They found four "discontinuous populations," three of common chimps plus the bonobos. Hybrids, those with at least five percent of their DNA from more than one common chimpanzee population were rare, with most of the hybrid chimps born in captivity. "We saw littl...

Re-analysis of cigarettes confirms tobacco companies increased addictive nicotine 11 percent

...ds were increased in the cigarettes of each of the four major manufacturers and across all the major cigarette market categories (e.g. mentholated, non-mentholated, full-flavor, light, ultralight). Findings from the report "Trends in Smoke Nicotine Yield and Relationship to Design Characteristics...

Long-term narcotics use for back pain may be ineffective and lead to abuse

...ids may be effective for the short-term (less than four months) treatment of chronic low back pain, but long-term effectiveness was not conclusive. "Our results also demonstrate that the quality of the literature on these topics is generally weak and more studies need to be done before firm conclusion...

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