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Tag: "did" at biology news

St. Jude study solves mystery of mammalian ears

... no alteration in hearing, which suggested that it did not matter whether the outer hair cells contracted or extended itself, that is, raised or lowered the cilia. There was no effect on amplification. The researchers concluded that somatic motility was not simply a way to make cilia do their job better;...

Genomic Analysis Uncovers New Targets for HIV Vaccine

...y confer protection for patients but whose effects did not reach statistical significance in the study. However, some of these polymorphisms could ultimately be shown to play a major role when future analyses involving more patients are performed, the researchers said. Patients involved in the study cam...

Agent slows aging in mice

Aspirin didn’t pan out. Neither did two other potential anti-aging agents. But a synthetic derivative of a pungent desert shrub is now a front- runner in ongoing animal experiments to find out if certain chemicals, known to inhibit inflammation, cancer and other destructive processes, ...

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

...l air particulate pollution. While the researchers did not specifically study the protein-coding regions of DNA where genes reside, Yauk notes that previous studies correlate mutations in non-coding regions with those in coding regions, and that some repetitive regions of DNA (not exam-ined in this study...

A new plant-bacterial symbiotic mechanism promising for crop applications

...n. The first observation was that the bacteria did not penetrate the roots of its host-plant by the hairs. It took advantage of “crack zones” comparable with wound areas. The set of results obtained from subsequent work, seeking to identify the genes involved in producing the unknown signal molecule ...

U-M researchers discover gene switched off in cancer can be turned on

...tch back on. While the existing HDAC inhibitors did return BRM expression, the effect was short-lived. Once the drugs were taken away, BRM expression decreased. “The HDAC inhibitors are not the perfect answer, but in principle this tells us we can turn our gene back on. If we can turn the gene back...

Undergraduate research shows leaderless honeybee organizing

...new nest site has been selected. “Drew Pierce did this project last summer,” Schneider explained. “We constructed a special observation stand where we could actually see how workers were interacting with queens inside a swarm cluster, where they are hanging in a tree. That was really interesting, ...

Massive herds of animals found to still exist in Southern Sudan

... Southern National Park, located west of the Nile, did not fare as well. Here the team observed a 90 perc... had been estimated to roam in the past.” The team did verify the presence of the largest antelope on earth, the Derby eland, in Southern National Park. “T...

CT scan reveals ancient long-necked gliding reptile

...the object to be scanned. Because the researchers did not want to cut up the sheet of rock in which the fossilized glider was embedded, they gave up total resolution of all of the bones. Because this fossil has been identified and named from CT scan, one benefit is that the bones themselves have not ...

Staphylococcus aureus hides out in cells

...rwich, UK set out to uncover what S. aureus (6850) did inside human lung epithelial cells (A549) using an in vitro model. They found that shortly after S. aureus entered the lung cells, the bacteria’s gene expression profile dramatically changed: gene expression for bacterial metabolic functions and tran...

Research finds that circadian rhythms dominate all life functions

...f expression, we could not find a single gene that did not oscillate," Ptitsyn said. ...

Clot-dissolving agent may be beneficial in treatment of severe frostbite

...5 frostbite patients treated from 1995 to 2006 who did not receive tPA, plus one who received tPA more th...mpared with 97 of 234 (41 percent) among those who did not receive tPA. “Moreover, no proximal [closer to the body than the fingers or toes] amputations we...

Blood-brain barrier breached by new therapeutic strategy

...ted administration of the RNA interference therapy did not trigger inflammation or antibodies to the peptide. Currently, doctors use various methods to deliver therapeutic drugs directly into the brain. These methods involve invasive procedures that result in only localized delivery around the site o...

Researchers discover 'acquired' DNA key to certain bacterial infection

...ody’s initial immune response. The researchers did not find a similar island of acquired genetic mate...atch those in known databases.” The researchers did discover that one of the genes provides coding for a protein that targets action in the host cell, w...

Prey not hard-wired to fear predators

...ce of predators, the elk, moose, bison and caribou did not show the kind of vigilance, clustering behavio...responded five times faster to the recordings than did elk in Rocky Mountain National Park (Colorado) where major predators have been absent for some 90 ye...

Ice Age extinction claimed highly carnivorous Alaskan wolves

...icated. “When their prey disappeared, these wolves did as well,” Leonard said. But the results of this study also imply that the effects of the extinction were broader than previously thought. “There may be other extinctions of unique Pleistocene forms yet to be discovered,” she added....

Ants show us how to make super-highways

... they plug and cooperate to plug larger holes. "We did this by getting the ants to literally ‘walk the plank’, said Powell. "We inserted planks drilled with different sizes of hole into the army ants’ trails to see how well different sizes of ant matched different sizes of pot hole. Indeed, they fit bea...

New research shows sharks use their noses and bodies to locate smells

...ioning the lateral line increased search time, but did not affect success rate or plume preference. Howev...nd the few animals that located any of the targets did not discriminate between odor and seawater plumes, let alone targets. "These results demonstrate...

Common treatment for methamphetamine overdose may damage brain cells

...f movement disorders, they say, although the study did not measure movement specifically. In addition to future studies of other antipsychotic medications, says Yamamoto, "we hope to examine if the loss of cells results in abnormal involuntary movements resembling Tourette's syndrome and Huntington's...

Detecting cold, feeling pain: Study reveals why menthol feels fresh

...including menthol. The genetically engineered mice did not discriminate between warm and cold surfaces until the temperature dropped to extremes. "It's been known for years that menthol and related cooling agents evoke the psychophysical sensation of cold – somehow by interacting with the aspect of th...

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