experiments 2 6

Tag: "experiments" at biology news

A whole lot of shaking goin' on triggers early hatching in red-eyed tree frogs

...aturely than did the rain-like white noise. "These experiments don't rule out the possibility that the frog eggs use other cues," she says. "But clearly, differences in temporal patterns are enough to affect the perception of how dangerous a disturbance is." ...

Brown-Harvard team solves mobile DNA's surgical sleight-of-hand

...out site-specific recombination. In complementary experiments carried out at Brown and published recently in the Proceedings of the National Academy of Sciences, Radman-Livaja tagged bits of lambda DNA with dyes that allowed her to draw up a map of this viral DNA during insertion. "It was gratifying to see tha...

Study shows humans have ability to track odors, much like bloodhounds

...humans had the ability to localize odors, based on experiments in 1964 with human subjects. He suggested this was...each nostril. In addition, they conducted similar experiments on five volunteers who had no olfactory nerves and therefore couldn't smell at all, a condition know...

Researchers use 3-D imaging system to unveil swimming behavior of microscopic plankton

...until now. The results were captured during three experiments lasting several weeks at two sites in the Red Sea's Gulf of Aqaba, near the coral reef of Eilat in Israel and at Ras Burka on the coast of Egypt's Sinai Peninsula. At the sites scuba divers attached Fish TV's sonar head ("transducer") on a large unde...

Caloric restriction won't dramatically extend life span in humans: UCLA research

...ngevity, using representative data from controlled experiments with rodents, as well as published studies on humans, diet and longevity. He and Michael Rose, professor of ecology and evolutionary biology at the University of California, Irvine, published their findings in a journal article titled, "Why dietary r...

Scripps research scientists solve structure of a critical innate immune system protein

...But the structure has given us great insights into experiments we can design to explore their function. In advance, we wouldn't have known where to look." In addition to helping scientists better understand how TLRs work, the structure may also help scientists take steps toward improving human health, since TLR...

To translate touch, the brain can quickly rearrange its sense of the body

...of the right arm was vibrated, the subjects in the experiments felt within seconds that their right elbow was rotating away from the body, even though the arm was actually quite still. If subjects held their left index finger with their right hand while this happened, they felt their left index finger getting lo...

New tool reveals secrets of migrating cells

... signal that will decide the cell's fate. In their experiments on one lobe of the mouse thymus, in fact, Witt and her colleagues saw cells, possibly those that have made a decision on their fate, halt their wanderings and make a beeline out of the cortex to the medulla, something immature T cells can't do. The ...

Scientists find microRNAs regulate plant development

...te for Biomedical Research in Cambridge, MA report experiments using transgenic Arabidopsis plants that produce a...ows potential for microRNA-mediated regulation. In experiments analogous to those of Bartel's group, Chua and colleagues created transgenic Arabidopsis plants that...

Novel plague virulence factor identified

... the Duke Center for Translational Research. "Our experiments have demonstrated how closely the Y. pestis-C. elegans model we developed mimics what happens when Y. pestis infects mammals," said Duke microbiologist Alejandro Aballay, Ph.D., lead researcher of the team. "This system should help speed the characte...

New Look at DNA Hints at Origin of UV Damage

... the Duke Center for Translational Research. "Our experiments have demonstrated how closely the Y. pestis-C. elegans model we developed mimics what happens when Y. pestis infects mammals," said Duke microbiologist Alejandro Aballay, Ph.D., lead researcher of the team. "This system should help speed the characte...

Disease diagnosis, bioengineering covered at state nano summit

...gineering applications. The proteins used in these experiments are almost always naturally occurring and derived from living organisms. However, these proteins are not optimized to carry out anything other than their natural role. Krause proposes that if the widespread use of proteins in nanotechnology is to be ...

Attacks of King George III's madness linked to key metabolism molecule

...odels of chemical porphyria." Through a series of experiments with normal mice and those engineered to lack the PGC-1 alpha gene, the researchers said they have provided "a clear-cut mechanism" linking fasting to an increase in PGC-1 alpha, and, in turn, overactivity of the ALAS-1 gene. The therapeutic effect o...

Researchers feed tiny pills of RNA to planarians to identify genes essential for regeneration

... the way. "Our limitations right now are how many experiments we can do in a day," he said. "The mystery of what makes regeneration possible, particularly in these animals, is on its way to finally being resolved." ...

New protein vital for immune response is found in surprise location

...e is evidence that MAVS binds with RIG-I, but more experiments are needed to determine just how MAVS functions within the cell. Other UT Southwestern researchers involved in the studies were lead authors Rashu Seth, a graduate student research assistant, and Dr. Lijun Sun, a postdoctoral researcher in molecular...

Study shows how retinoic acid enters a cell's nucleus

...the hormone that switches on its NLS. In previous experiments with mice, Noy and her colleagues showed that by increasing CRABP-II levels within cells, tumor growth rates slow dramatically. The protein transfers RA rapidly and efficiently to the cell's nucleus. In this way, tumor growth may be inhibited using n...

Pinpointing the cause of a neurodegenerative disorder

...rotein." Those conclusions were based, in part, on experiments in mice that showed that increased levels of norma...a more fruitful direction. Bellen's team was doing experiments designed to identify proteins that interact with the Drosophila protein, Senseless. His group discov...

Orientation and the egg

... axes. "It would now make sense to base our future experiments on the premise that the mammalian egg neither has nor requires predetermination for successful development," explains Dr. Hiiragi. ...

Deep sleep short-circuits brain's grid of connectivity

...at all. Somehow, it doesn't travel anywhere." The experiments conducted by the Wisconsin team are the first of their kind. The results lend support to the idea that consciousness depends on the ability of the brain to integrate information. In other words, consciousness rests on the ability of the various regio...

Frog peptides block HIV in lab study

...at all. Somehow, it doesn't travel anywhere." The experiments conducted by the Wisconsin team are the first of their kind. The results lend support to the idea that consciousness depends on the ability of the brain to integrate information. In other words, consciousness rests on the ability of the various regio...

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