Tag: "acts" at biology news

Genetic on-off switch found at Purdue could turn on gene therapy

...17 </a/a>). In operation, Kohlhaw's system acts more like a dimmer switch on a light thanlike a plain on-off switch. Without the inducer, the switch is off. Add a littleinducer and you turn it on. Add more inducer and you "turn up the light." Kohlhaw and research associate Hui Guo put this genetic...

Heart cells closely control their own oxygen supply

...below 6 percent, the cells secrete adenosine,which acts directly to trigger dilation of the vessels. (For comparison, oxygenconcentration in the air is about 20 percent, substantially higher than theoxygen concentration in the blood supplying the needs of myocytes. It is lowerat the surface of the cardiac...

Old brains can learn new tricks!

...PET). PET measuresregional cerebral blood flow and acts as a marker to show which brain areas are'lighting up' during a memory performance task. Participants were shown pairs of vertical grid patterns on a computer screen andasked to select which one had the higher spatial frequency. After viewing eachpai...

Harvard Medical School researchers discover first in a new class of mitosis inhibitors

... The scientists have not formally proven monastrol acts through Eg5, andthey cannot say whether it does no... towards the poles. Kapoor is wonderingwhether Eg5 acts like a "smart glue" that somehow accommodates this movementwhile keeping the spindle intact. "We can...

UF researchers score gene therapy advance: Animal study shows high blood pressure prevented in future generations

...nsible for regulating blood pressure, angiotensin, acts at specialized sites known as receptors, located on the surface of cells. During their study, UF researchers rewrote the genetic message that typically orchestrates the creation of these sites. They then packaged the genetic material into a virus mod...

Genetic extremism overstates risks

CORVALLIS - Amid increasing acts of vandalism and protests against the use of genetic engineering in forestry, a group of scientists said this month in a professional journal that scare tactics used by environmental extremists must yield to a more careful analysis of the issues base...

DFG to set up 21 new collaborative research centres in 2000

...liches Seminar, tel.: 0251/83 22512/13 Symbolic acts and ritualised, traditional or ceremonial forms are the tools of politics and the law, religion and everyday life. The new collaborative research centre "Symbolic Communication and Societal Systems of Values from Mediaeval Times to the French Revolu...

Zebrafish's powerful heart gene could lead to transplant therapy

...enes in mice and humans. The gene, known as gata5, acts in embryonic cells, which are primordial,unspecial...ls, skin cells, andliver cells. Normally, the gene acts only in those embryonic cells destined to becomemyocardial cells. The research shows, however, that ...

Antibacterial implants could prevent infections, save patients' lives

...then leaches out of the polyurethane. The coating acts as a barrier to the antibiotic, controlling the rate at which it is released to the surface of the device. "The outer coating is just 10 or 20 atoms thick," Ratner said. "It makes for a very controlled, slow release." Tests showed that the syste...

Smell, taste may influence lifespan of the roundworm C. elegans

...ding suggests, saysKenyon, that the hormone system acts as a central regulator of lifespan, integrating signals fromvarious places to control development and aging in response to environmental signals, such as food, aswell as internal signals that reflect the state of the reproductive system. Moreover, t...

Nonchemical weedkiller has huge potential; hungriest nations may benefit thanks to McGill plant scientists

...heir seed coated first with wet arabic gum, which acts as an adhesive, and then with the Fusarium inoculant. Once the seeds are planted, the rain activates the Fusarium inoculant and makes it available exactly where it is needed: at the roots of the cereal plant. Using inexpensive, locally availab...

X-rays may show way to better Alzheimer's drugs

...Structural Biology, has revealed that galanthamine acts in a similar manner, replenishing acetylcholine levels by binding to AChEs active site and shutting off its "cutting machinery." Greenblatt conducted the research together with Dr. Gitay Kryger, and Professors Joel Sussman, and Israel Silman, all ...

Obesity gene controls bone density via brain pathway

... Leptin, the hormone product of the obesity gene, acts as a natural bone inhibitor by telling the brain t...ntification of the leptin pathway, where the brain acts as the central component in building bone mass, opens a new realm of treatment approaches." The link...

Revised model of protein-drug interactions could make job of drug designers a little easier

...nzyme is designed to react with -- while the other acts as an inhibitor. ...

Searching for biochemical markers in children of alcoholics

...oid system of the brain. It produces euphoria and acts like the body's own morphine, said Froehlich. Endorphin levels increase, for example, during childbirth, trauma and running (known as the "runner's high"). Endorphin levels also increase in response to alcohol drinking, and this hormone may contrib...

Rockefeller University researchers discover immune-cell mechanism that boosts therapeutic antibody potency

...ce of certain immune cells. One of these receptors acts as an "on" switch to initiate an immune response, while the other acts as an "off" switch to hold the immune system in check and prevent it from attacking the body. As eff...

Co-existing illnesses, high cholesterol add to suicide risk

... patient isdangerous. "Media portrayals of violent acts by persons with mental illness have linked delusions and violence inthe popular mind," said Paul S. Appelbaum, M.D., principal researcher of the study. "Our data,however, suggest that people with delusions are not more likely to be dangerous after ho...

Mice show how to calm anxiety

...tor in some areas of the brain responds to Crh and acts to oppose the anxiety response," says Rosenfeld. "One might think of this activity of Crhr2 as a focusing of the anxiety response. Thus, instead of having the animal exhibit a full anxiety response to a stressful situation -- with many areas of the b...

Researchers find key to growing, differentiating human cells

... Li explained that the polyester acts like a solid at room temperature, and a liquid at high temperature. At a specific temperature in between, around 160F, it exhibits characteristics of both solid and liquid on the molecular l...

Evidence suggests food preservatives may help prevent cavities

...non-steroidal anti-inflammatory drug (NSAID), also acts like fluoride and food preservatives in the way it inhibits bacteria. Again picking up on that basic research, Bowen's team has just published results showing that ibuprofen also enhances fluoride's action, dramatically reducing the number of cavitie...

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