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Tag: "kept" at biology news

Experience affects new neuron survival in adult brain; study sheds light on learning, memory

...suggests that the information on the experience is kept for a long time, says Gage. "This finding indicates the way in which new neurons in the adult brain could contribute to learning and memory by storing the information of one’s previous experiences," Gage says. Future research, he says, should focu...

Ring-around-the-cell

...m the ring, whether they somehow fused together or kept their individual shapes. The research team’s findings showed clearly that the ring is made of individual podosomes held together by interconnecting protein filaments they throw out to each other. "The podosomes are like folk dancers," says Geiger. "A...

Dinosaur extinction didn't cause the rise of present-day mammals, claim researchers

... the dinosaurs were wiped out, present day mammals kept a very low profile, while these other types of mammals were running the show. It looks like a later bout of 'global warming' may have kick-started today's diversity ?not the death of the dinosaurs. "This discovery rewrites our understanding of how...

One-of-a-kind imaging probe reveals secrets useful for drug discovery

...e with the analysis. But the sample area itself is kept warm to protect the specimen. "It is now possible to approach problems we couldn't think about before," said Edison, who said he welcomes collaboration with other scientists interested in using the new probe. "For example, in mouse models of Parkins...

Chronic jet-lag conditions hasten death in aged mice

...significantly higher death rates than did old mice kept on a normal daylight schedule over the same eight-week period. The findings may not come as a great surprise to exhausted globe-trotting business travelers, but the research nonetheless provides, in rather stark terms, new insight into how the disrup...

Record ozone loss during 2006 over South Pole

... atmospheric mass above the Antarctic continent is kept cut off from exchanges with mid-latitude air by prevailing winds known as the polar vortex. This leads to very low temperatures, and in the cold and continuous darkness of this season, polar stratospheric clouds are formed that contain chlorine. A...

Mayo researchers discover HIV dependence on a human protein

...ned onto a computer hard drive. While patients are kept healthy when those copies are "suppressed" with multiple daily antiviral medicines, they are never cured. Stopping the medicines even briefly lets HIV repopulate the body with many millions of copies, like a computer virus spreading around the world ...

Plants give up answers in the war on bacteria

...zed human-infecting bacteria, such as E. coli, and kept the stomata closed to them. Plant-infecting bacteria, like those most destructive to crops, have figured out a way to reopen the shut-down ports. It appears those plant-based bacteria produce a phytotoxin, a chemical called coronatine, to force the...

First biomarker for human sleepiness identified in fruit flies

...lies without incurring sleep debt. When scientists kept the same mutant flies awake for extended nine or 1...st triggered by wakefulness," Shaw says. Humans kept awake for 28 hours also had increased amylase levels versus controls allowed to sleep normally. S...

Embryonic stem cells do better on bumpy nanoscale mattress

...eath the cellular mattress. Unlike the princess kept awake by the pea, human embryonic stem (HES) cells...for five days on the artificial ridges and grooves kept their “stemness,?their self-renewing phenotype, far better than HES cells plated on standard flat c...

Pressured by predators, lizards see rapid shift in natural selection

... a natural colonizer of small cays. The scientists kept six other control cays predator-free and exhaustively counted, marked, and measured lizards on all 12 isles. Anolis sagrei spends much of its time on the ground, but previous research has shown that when a terrestrial predator is introduced, these...

Psst! Coffee drinkers: Fruit flies have something to tell you about caffeine

...ology. For the study, Montell and his colleagues kept 50 fruit flies away from food overnight and for breakfast gave the starved flies 90 minutes to eat as much as they wanted of either or both of two concoctions: a blue-colored mixture of sugar and agar and a red-colored mixture of caffeine, sugar and ...

Changing length of days reverses how estrogen affects aggressiveness in mice

... normally aggressive mice less aggressive. In mice kept in long day length conditions (as in summer), the normally docile mice were more aggressive. This showed that estrogen was indeed controlling levels of aggression in these mice. But the researchers went further and identified the mechanisms that m...

Fruit fly aggression studies have relevance to humans, animals

...nd control ?from the same baseline population, and kept them separate for 28 generations. From each generation, she selected the most aggressive flies from the high aggression group, the least aggressive flies from the low aggression group, and a random sample of the control flies, to be the parents of th...

UNC scientists solve mystery of how largest cellular motor protein powers movement

...ve and detailed molecular structure for dynein has kept scientists largely in the dark about how the protein converts ATP into mechanical force, said Dr. Nikolay V. Dokholyan, assistant professor of biochemistry and biophysics in the UNC School of Medicine. Dokholyan said the dynein puzzle is similar t...

Viral marker of human migration suspect

... strictly passed down from parent to child and had kept step with human migration, one would expect the various subtypes to group together geographically, she explains. Shackelton added that if the co-evolution of the virus and human populations were as strict as previously thought one would not find ...

Epstein-Barr virus might kick-start multiple sclerosis

...ists life-long inside immune system B cells and is kept under control by virus-specific T cells. When B cells divide, the virus produces EBNA1 and uses it to slip its own DNA into the new cell. T cells that target EBNA1 are a crucial component of EBV-specific immune responses in individuals without MS. L...

Unique soybean lines hold promise for producing allergy-free soybeans

... St. Louis screened more than 16,000 soybean lines kept in the USDA's National Soybean Germplasm Collection. The findings will appear later this year in the journal Crop Science. The two soybean lines (PI 567476 and PI 603570A) contain virtually identical genetic mutations that do not contain the leading...

Important gene controlling tree growth and development found

... hours! This trait is genetically inherited and is kept if the tree is moved to a new climate. How the trees control their flowering, and why trees set bud at a certain time in the fall have been important questions for the scientists to answer. This is for two reasons. These are important traits that "...

Female birds boost up their eggs when hearing sexy song

...eewiesen and Radolfzell in Germany. The birds were kept in large aviaries where their daily behaviour was monitored in a colony before they were tested in the song experiments. The females showed a remarkable consistency in their behavioural and reproductive performance and the song stimuli alone were suf...

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