Tag: "repels" at biology news

Frog skin and supercomputers lead Penn chemists to designing better bacteria killers

...phiphilic one side attracts water while the other repels it. It is thought that this property of the material allows it to reach the bacterial cell membrane and induce leakage that destroys the bacteria. "Unlike conventional antibiotics, for example, the arylamide's ability to attack a fundamental feature...

Models help estimate children's exposure to toxins

...ed to treat wood in play sets and decks because it repels wood-boring insects. Trace amounts of everything from ibuprofen to DDT are showing up in ecosystems around the world. Some environmentalists suspect these and other synthetic compounds in behavior changes and increased rates of mutation among fish an...

Invading species have tough time cracking diverse neighborhood

...earch team found that a rich assemblage of species repels invaders because it is more likely to contain plants occupying a niche similar to what the invader needs, as well as plants that make good all-around competitors. The findings have implications for land managers, suggesting that maintaining the nativ...

Secrets of drug resistance in bacteria

...images of a protein complex found in bacteria that repels a wide range of antibiotics. The images, which appear in the May 9 issue of the journal Science, offer new insight into how bacteria survive attacks from different antibiotics, a growing health problem called multidrug resistance. As the team learned...

Highlights of American Chemical Society's national meeting in New Orleans

....m. Morial Convention Center, Room 387) Catnip repels and kills termites Researchers have found that oil from the catnip plant beloved by cats repels and kills termites, which cause millions of dollars in damages to homes in the United States each ye...

Termites repelled by catnip oil

...ice researcher Chris Peterson show that catnip oil repels and even kills termites in a laboratory setting. Peterson, a researcher with the Forest Service Southern Research Station (SRS), and fellow researcher Janice Ems-Wilson, a chemist at Valencia Community College in Orlando, FL, presented the results o...

Mosquitoes repelled by tomato-based substance

...y tomatoes repels mosquitoes ... Roe said that like DEET, IBI-246 repels insects effectively and, on the scale used by the EPA to gaug...

Understanding DNA damage: New study suggests environment surrounding DNA plays key role in controlling charge transport

...nal Materials Science. "The motion of one charge repels the other, resulting in a correlated dance of the two." Using one of the largest electronic structure calculations ever done, Landman and colleagues Robert Barnett and Charles Cleveland predicted how the process would work theoretically. Th...

American Chemical Society meeting features cutting-edge research August 26-30 in Chicago

.... (Monday, August 27, 8:30-11:30 a.m.) Catnip repels mosquitoes more effectively than commercial compound An oil found in catnip that gives the plant its characteristic odor is about ten times more effective at repelling mosquitoes than DEET, the compound used in most commercial insect repellants, re...

Catnip repels mosquitoes more effectively than DEET

...oup that two years ago discovered that catnip also repels cockroaches. Entomologist Chris Peterson, Ph.D., w...f repellency as a DEET-based repellent. Why catnip repels mosquitoes is still a mystery, says Peterson. It might simply be acting as an irritant or they dont ...

Scientists discover how nerve cells move from target to target as they wire up the developing embryo

...The interaction between the two either attracts or repels the migrating axons on their initial journey in the embryo. Researchers at UCSF and UC Berkeley did much of the initial work, identifying an attractant dubbed netrin and repellents named semaphorin and slit, as well as their receptors. In 1998, scien...

An "alarming" discovery for ruffe

...ease a potent pheromone when they are injured that repels other ruffe and could be useful in controlling this exotic nuisance fish. University of Minnesota Sea Grant researcher Peter Sorensen and his colleagues reported their findings in the latest issue (Vol. 26, No. 2) of the "Journal of Great Lakes Rese...

Scientists find first molecule that guides nerve cells through the brain

...t attract young cells to where they need to go. It repels them, like a dogherding a flock of sheep. "This is...ofthe forebrain was known produce a substance that repels migrating neurons.Studying brain tissue from rats 4 days to 7 days of age, the researchers placedpie...

New Class Of Molecular Cues Guides Nervous System Wiring

...ad sign that, depending upon theconditions, either repels growing neurons or triggers neurons to sprout newconnections. As reported in three articles in the March 19, 1999, issue of the journal Cell , this seemingly contradictory "Stop-and-Go" behavior of the protein,Slit, opens an intriguing new chapter i...

Heart and Soul: The Blood Vessels And Brain Use Common Guide

... to inhibit endothelial cell movement, muchlike it repels neurons, he says, it might become a candidate angiogenesisinhibitor for cancer therapy. Klagsbrun seems to have a knack for growth factors that play dual rolesin the brain and blood vessels. The only other example known is fibroblastgrowth fa...

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