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Tag: "pressure" at biology news

Protect patients from exploitation by alternative medicines industry

...trol, says Waxman. For others it is because of the pressure put on them by families, friends or vested interest groups to “go organic.? “It’s time for legislation to focus on a particularly vulnerable section of our society and do something to limit the exploitation of our patients,?he says. Why not subject...

Technology for monitoring fetal oxygen during labor offers no apparent benefit

...n heart rate might have been caused by inadvertent pressure on the umbilical cord when inserting the sensor, or because of manipulation of the baby's head. "In this study of more than 5000 women delivering at 14 university hospitals throughout the United States, knowledge of intrapartum fetal oxygen satura...

76 percent of workers older than 60 years of age are overweight or obese

...rmore, pre-hypertension, involving sustained blood pressure levels between 120-139 mmHg and 80-89 mmHg, affects 47% of active workers. He therefore concludes, according to his analysis, that there is a connection between metabolic syndrome and minor degrees of renal dysfunction. Metabolic Syndrome and car...

Walking not enough for significant exercise benefits

...perienced a four per cent increase. Systolic blood pressure also dropped by 10 per cent for the traditional fitness group, compared to four per cent for the group who just walked. Other markers of overall health, such as fasting plasma glucose levels, response to a two-hour glucose tolerance test and variou...

Too mellow for our predatory world

...contrast, the reptiles living with acute predation pressure responded to the harassment experiment with an imm...hrough long evolutionary periods with no predation pressure and that it can quickly regain its activity once predation resumes. "But changes in flight distance ...

For crickets, parasitic flies can stop the music

...rchers to examine the role of flies as a selective pressure on male singing and female mate choice behavior. That said, not all of the findings were clear-cut. Although fewer males sing in the fall, for example, the ones that sing do so far longer, placing themselves at even greater jeopardy of being paras...

Comparing chimp, human DNA

...n regions carrying genes, as there is no selective pressure to stop mutations from accumulating. But the human-accelerated regions are highly conserved across the other groups of animals the researchers looked at, suggesting that they do have important functions that stop them from varying too much. ...

Poor athletic performance linked to vitamin deficiency

...be the healthiest," said Manore. "There's a lot of pressure on women in particular to look like an 'athlete.' Unfortunately for some people that means skinny and petite, rather than healthy and strong." The B-vitamins are in whole and enriched grains, dark green vegetables, nuts, and many animal and dairy p...

Geneticists discover genes that make fruit fly hybrids sterile

...ue to natural selection, a genetic change due to a pressure that benefits the survival of a species. The researchers would like to learn what these genes normally do within their species in order to understand why they are evolving so fast. The Dobzhansky-Muller model also proposes that these evolved genes ...

A new target for painkillers

...t's sensitivity was assessed by measuring how much pressure could be applied to a hind paw with a blunt Teflon...paw. Normal rats could withstand 4.7 times more pressure before withdrawing their paws, compared with rats with sciatica. When cone snail toxin RgIA was inje...

Sex and the heart: It's not what you think

...more likely to have more high-risk levels of blood pressure and cholesterol are no longer true in the U.S. pop...rs apart. Among the findings: High risk blood pressure - both diastolic and systolic - increased in women but decreased in men. Medication against hyperte...

Genetic surprise confirms neglected 70-year-old evolutionary hypothesis

...ke geographic isolation, are added to the mix, the pressure may be enough to split one species into two new species. When asked if JYAlpha may be responsible for melanogaster and simulans' initial split a few million years ago, Masly replied, "That's lost to history." Fortunately, the theory isn't. ...

American scientist's research of life's first cells

...en the genome replicates inside a vesicle, osmotic pressure leads the vesicle to "steal" membrane from other, empty vesicles. This could be an example of Darwinian evolution, according to Chen. "Exploration of these minimal systems promises to lead to more exciting insights into the origins of biological comp...

Archerfish tune their shots to universal properties of prey adhesion

...n a shot, rather than altering the initial release pressure and speed of the shot. This turns out to be the most efficient way of adjusting force--by doubling the mass of water shot, the fish double the force that is applied to prey in a way that only doubles the energetic cost of the shot; doubling speed of ...

Molecules in blood foretell development of preeclampsia

...vessels, also signal the development of high blood pressure during pregnancy. The findings appear in the Sep...thout warning. The condition results in high blood pressure and protein in the urine. Preeclampsia may begin with mild symptoms, then progress to severe preecl...

New clues to how sex evolves

... in only three days, is under a lot of competitive pressure to reproduce quickly, and that different binding sites on different Pairing Centers makes for faster chromosome pairing and thus faster reproduction -- unlike organisms that need to find a mate before they can reproduce, and mature more slowly." ...

Heart smart: new drug improves blood flow

...diseased arteries, reducing the risk of high blood pressure and heart attacks, a Monash University study publi...' indicators and 'risk factors' such as high blood pressure and high cholesterol. "However, not all people with high blood pressure or high cholesterol experi...

Genome info from 'plant destroyers' could save trees, beans and chocolate

...pidly changing genes are being driven to evolve by pressure from the defense systems of the pathogens' host plants," said Virginia Bioinformatics Institute's Brett Tyler, the project's principal investigator. "The Phytophthoras, in addition to their great economic importance, are fascinating organisms with v...

Male contraception: One door opens, another closes

...China and India. Stresses Lissner, "Only public pressure can get researchers the funding they need to see which of these leads is going to work out." ...

Gold nanoparticles prove to be hot stuff

...e materials that can be trapped by laser radiation pressure more efficiently, which would enable faster measurements and detection of smaller motions at the same laser power. As described in the Aug. 15 issue of Optics Letters,* the JILA team demonstrated that 100-nanometer-wide gold beads, as expected becaus...

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