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Tag: "active" at biology news

Scientists discover stem cell origin of neck and shoulders

...nd a number of serious human illnesses. This is an active area of research that we are involved in." ...

Divergent life history shapes gene expression in brains of salmon

... freshwater to reproduce, may actually result from active inhibition of development into a sneaker. Previous studies have found that the proportion of sneakers in various salmon populations varies wildly; it appears that males that grow fastest early in life go on to become sneakers. The study by Aubin-Hor...

Pregnant women at higher risk for HIV, Uganda study finds

...ssessed 2,188 HIV-negative women who were sexually active and were pregnant or breastfeeding, and compared their rates of HIV acquisition to 8,473 women who were neither pregnant nor lactating. They compared the incidence rates of HIV during pregnancy and breastfeeding with the rates during intervals when p...

New lifespan extension genes found

... Hst2 was overexpressed, so that the gene was more active than normal, the yeast lived longer than normal. A third gene, Hst1, appears to act when both Sir2 and Hst2 are missing. Sir2 and the newly identified Hst genes account for all of the life-prolonging effects of caloric restriction in yeast, Lin said...

Deep sleep short-circuits brain's grid of connectivity

... Scientists have long known that the brain remains active while we sleep," Tononi says. "So what could be responsible?" To explore the breakdown of consciousness during sleep, Tononi and his colleagues capitalized on a new technology - transcranial magnetic stimulation - that permits precise, non-invasiv...

Frog peptides block HIV in lab study

... Scientists have long known that the brain remains active while we sleep," Tononi says. "So what could be responsible?" To explore the breakdown of consciousness during sleep, Tononi and his colleagues capitalized on a new technology - transcranial magnetic stimulation - that permits precise, non-invasiv...

Thinking the pain away? Study shows the brain's painkillers may cause 'placebo effect'

...ll receptors, the PET scans can be used to see how active the opioid system and mu-opioid receptors are. The...on signal from a particular brain region, the less active the mu opioid system, and vice versa. All of the participants showed an increase in the activation ...

Promiscuous Catalytic Activity Possessed by Novel Enzyme Structure

...al properties. Many of these molecules only become active once they have had a prenyl group added. The rese...livetol, a component in the production of THC, the active ingredient of marijuana. Unlike other previously known prenylation enzymes that only act on a small ...

Stem cell training program to make its Stanford debut

...al properties. Many of these molecules only become active once they have had a prenyl group added. The rese...livetol, a component in the production of THC, the active ingredient of marijuana. Unlike other previously known prenylation enzymes that only act on a small ...

Woods Hole Research Center plans controlled burn in Amazon rainforest

...how reliable those measurements were for detecting active fires under a forest canopy. According to Nepstad,...rse-resolution satellites that are used to monitor active fires around the world. The fire and subsequent fire scar could both be easily seen, however, using ...

Looks matter to female barn swallows

...h their original male mate, but they were sexually active with other males. The males with enhanced color fathered a substantially larger percentage of offspring in their second nests. Males whose color was unchanged fathered the same number or fewer chicks than they had in their first nests. "The study sho...

'Jumping genes' contribute to the uniqueness of individual brains

...as been known for a long time that L1 elements are active in testis and ovaries, which explains how they potentially play a role in evolution by passing on new insertions to future generations. "But nobody has ever demonstrated mobility convincingly in cells other than germ line cells," says Gage. Apart fr...

Compound from Chinese medicine shows promise in head and neck cancer

...ve isomer of gossypol binds at a site to block the active Bcl-xL protein. A prior study conducted by researchers in the U-M Head and Neck Oncology Program showed Bcl-xL protein is often highly expressed in head and neck cancers. In this study, researchers developed head and neck cancer cell cultures resist...

Bitter or sweet? The same taste bud can tell the difference

...ls. Though researchers have long known that NPY is active in the brain and gut, this is the first study to show that it is also active in taste bud cells. That finding gives scientists a deeper understanding of how the human brain may...

Lance Armstrong through a physiological lens: hard training boosts muscle power 8%

...s of recovery," Coyle summarized. "Recreationally active college students performed only 2-4 minutes of exe...ot increased, aerobic adaptations did occur within active skeletal muscle as reflected by a 38% increase in activity of the mitochondrial enzyme citrate synth...

Mass production of human papillomavirus could lead to gains against cervical cancer

...infected with HPV. At least 50 percent of sexually active men and women will acquire genital HPV infection at some point in their lives. By age 50, at least 80 percent of women will have acquired genital HPV infection. Although the infection is usually harmless, certain types of HPV are responsible for nea...

Mayan stingless bee keeping: Going, going, gone?

...stimated that they maintained more than a thousand active hives. In 1990, we only found around 400 hives, and in 2004, only 90. At this rate, we would expect the art of stingless bee keeping to disappear from the Yucatan by 2008." David Roubik, once dubbed "The Bee Man" in a National Geographic special abou...

Beauty queens urge girls not to sacrifice their bones

...menopause. Also, in one study, the most physically active young girls gain about 40% more bone mass than the least active girls of the same age. "Older people also benefit," he noted, pointing out that "exercising your ba...

Engineered skin offers clues to melanoma development

...In combination with other cancer genes, hTERT, the active protein in the enzyme telomerase, caused progressi...elopment of melanoma. They found the expression of active PI3K, together with CDK4, hTERT, and inhibition of p53, produced invasive melanoma growth indistingu...

Ibruprofen and other commonly used painkillers for treating inflammation may increase the risk of heart attack

...In combination with other cancer genes, hTERT, the active protein in the enzyme telomerase, caused progressi...elopment of melanoma. They found the expression of active PI3K, together with CDK4, hTERT, and inhibition of p53, produced invasive melanoma growth indistingu...

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