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Tag: "does" at biology news

St. Jude study solves mystery of mammalian ears

...previously discovered mutated form of prestin that does not make the outer hair cells contract in response to incoming sound waves as normal prestin does. Instead, the mutated form of prestin makes the cell extend itself when it vibrates. The St. Jude researchers reasoned that if altering the position o...

FDA sees nanotech challenges in every product category it regulates

...isted products has more than doubled in a year. It does not include nanotech consumer products which companies do not identify as such, or the hundreds of nano raw materials, intermediate components, and industrial equipment items currently used by manufacturers.” “In light of this fast-rising commercial...

Nicotine rush hinges on sugar in neurons

When nicotine binds to a neuron, how does the cell know to send the signal that announces a smoker’s high" As with other questions involving good sensations, the answer appears to be sugar. A University of Southern California study appearing with a commentary in Nature Neuroscience online...

Common cancer gene sends death order to tiny killer

...Johns Hopkins have discovered one way the p53 gene does what it's known for—stopping the colon cancer cells. Their report will be published in the June 8 issue of Molecular Cell. The research team identified a tiny bit of genetic code, a microRNA called miR-34a that participates in p53's uncanny ability...

Research identifies protein that signals flowering in squash plants

...wn as CONSTANS (CO) and FLOWERING LOCUS T (FT). CO does not appear to travel long distances through the phloem, but rather, it strongly influences the production of another substance (i.e. florigen) that does. Recent work in a number of laboratories has focused on a role for FT protein and/or FT mRNA as t...

Researchers discover inherited mutation for leukemia

... the Ohio State human cancer genetics program. "It does not shut down the gene, but just lowers its expression somewhat. "Recently, many cancer geneticists have come to believe that such subtle changes are common causes of cancer, and this is one of the first, strong examples of that principle." T...

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

... of repeated portions of DNA, called Ms6-hm, which does not contain any known genes. The “smoking” mice were exposed to two cigarettes per day, the equivalent – based on blood levels of tobacco by-products – of an average human smoker, according to research previously published by one of the study's co-au...

Gene therapy delivery of nerve growth factors reverses erectile dysfunction in animal model

...demonstration of a long-term treatment for ED that does not rely on the chronic administration of drugs that can have potentially harmful side effects," he explained. ...

Modeling the restless brain

...ions occur and offers insights into what the brain does while idle. "Some people see the brain in terms of inputs and outputs, like a computer. If you provide an input, you'll get a particular output," said Honey, a doctoral student in IU Bloomington's Department of Psychological and Brain Sciences. "W...

Simulations unravel outer membrane transport mechanism

...domain downward, away from the barrel" Second, how does the luminal domain respond to force in order to expose a permeation pathway through the barrel" In the first simulation the researchers applied a force to TonB and showed that the multiple hydrogen bonds between TonB and the luminal domain were st...

Bigger horns equal better genes

Size matters. At least, it does to an alpine ibex. According to a team of international researchers, mature, male alpine ibex demonstrate a correlation between horn growth and genetic diversity. Past research studies have shown that greater genetic diversity correlates with a gre...

Dirty snow may warm Arctic as much as greenhouse gases

... back on emissions can prevent further warming but does not produce immediate cooling....

'Lucky 13' as new gene discovery offers further hope for childhood blindness

...s still virtually zero as long as the other parent does not carry it," says Professor Inglehearn. "The odds of two parents both carrying the same or different mutations in the LCA5 gene is very low, but this increases where the parents are related." Professor Inglehearn hopes that the findings will be...

Undergraduate research shows leaderless honeybee organizing

...ndings by Schneider and others indicates that she does not exactly “rule.” Instead, the colony appears to...bee (worker or queen) and then vibrating its body, does not convey a specific message, but instead is a form of “modulatory communication” that alters exis...

Physicist cracks women's random but always lucky choice of X chromosome

...erns" Dr Nicodemi believes the randomness actually does give an evolutionary advantage. The mechanism means equal numbers of both the maternal and paternal X chromosome are preserved in the gene pool and the resultant population thus has more chance of surviving any biological threat targeted at a single ...

Runners -- Let thirst be your guide

...are often dehydrated to such small degrees, and it does not significantly affect us.” But he adds that endurance exercisers who don’t want to rely on their body’s thirst meter have another excellent option, and that is undertaking a sweat test. This involves recording a person’s weight digitally, then ...

Mutating the entire genome

...arise due to such mutations, and thus what the DNA does normally. They devised a much more efficient method for mixing and recombining pieces of two chromosomes, making it easier to breed mice with human cancers. Such mice are needed to develop new treatments. Vast, Non-Gene Stretches of the...

CU study reveals why starling females cheat

...es their brood's genetic diversity, even though it does not reap additional help. As yet, it is unknown how females detect the genetic similarities between themselves and their mates, though other species of birds appear to adopt similar mating strategies. "This is the first study to show that individu...

Male circumcision overstated as prevention tool against AIDS

... A history of polygamy in these Muslim communities does not appear to contribute to hi gher AIDS prevalenc...bset of “prostitutes” to their mathematical models does the infection spread exponentially to the general population....

Ancient retrovirus sheds light on modern pandemic

... well millions of years ago, the antiviral protein does not seem to be good at defending against any of the retroviruses that currently infect humans, such as HIV-1," Emerman said. "In the end, this drove human evolution to be more susceptible to HIV." For example, the researchers found that changes in TR...

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