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Tag: "pressure" at biology news

Botox could help target resistant tumors for treatment

...herapies. In tests on oxygenation, cellular oxygen pressure was shown to significantly increase after treatment by Botox in both types of tumors. In tests on perfusion, magnetic resonance imaging results (MRI) showed significantly greater perfusion in treated mice after three days. In addition, Botox "pre-...

Oh, rats! Designer animals reveal possible heart disease genes

... replaced chromosomes carried genes for high blood pressure and related conditions. In the second part of the study, TIGR molecular biologist Norman Lee led the team in using a DNA microarray technique to compare the expression of more than 22,000 genes among the hypertensive, healthy, and designer rats. By ...

Carbon cycle was already disrupted millions of years ago

...is. Methane could also have been formed under high pressure in coal seams and then subsequently released upon coming into contact with magma. A third option is that carbon from organically-rich sediment came into contact with hot magma. As a result of this the organic molecules combusted into CO2 and water. ...

Penguins waddle but they don't fall down, UH researchers say

...urz has created a special platform that contains a pressure mat. As penguins walk across the mat, it measures the variability in the width and length of their steps. The data will provide insight into the natural mechanics and stability of the penguins' walking patterns. Kurz is collaborating with biolog...

Unraveling the mysteries of poison

... it possible to develop medications for high blood pressure and many other diseases connected to potassium channel failure (Nature, April 13, 2006). Our body's cells have membranes, and "ion channels" are embedded in them. Ion channels are special proteins which let only certain ions through the membrane. Th...

Therapeutic prospects beyond Vioxx

... the clotting response, but also the rise in blood pressure caused by drugs like Celebrex. "Despite some chatter to the contrary, this issue of an aspirin effect has not been addressed directly in any of the clinical trials of COX-2 inhibitors," says FitzGerald. "However, although these studies indicate that...

Vital ocean prey play active role in environment

...marine mammals, yet they are vulnerable to fishing pressure and environmental change. In the February 2006 issue of BioScience, the monthly journal of the American Institute of Biological Sciences, Stephen Nicol of the Australian Antarctic Division presents a new conceptual model of the species' life history ...

New 'self-exploding' microcapsules could take sting out of drug delivery

...unded by a lipid membrane. As the gel biodegrades, pressure builds up in the membrane. Eventually the microcapsule ruptures, releasing the medication. The system, the researchers note, could change how some vaccines are administered. Instead of an initial injection followed by a series of boosters, for insta...

Genes affecting blood pressure change as children become adults

...e of the genes involved in controlling their blood pressure change as well, according to a study of more than ... and 18 accounted for up to one third of the blood pressure variation that occurred by age 18, says Dr. Harold Snieder, genetic epidemiologist at the Medical Co...

How nice, brown rice: Study shows rice bran lowers blood pressure in rats

...sing, called rice bran, significantly lowers blood pressure in rats whose hypertension resembles that of human...roke-prone rats lowered the animals?systolic blood pressure by about 20 percent and, via the same mechanism, inhibited angiotensin-1 converting enzyme, or ACE. ...

Study shows hope for ridding lakes of clawed invader

...ping point," where the combination of trapping and pressure from predator fish pushes the rusty crayfish population to crash, with the lake ecosystem returning to its pre-rusty crayfish state. "What we are wondering is whether we will reach a tipping point where the fish alone can keep up the pressure," say...

Cincinnati surgeons report new treatment for often-fatal injury

...ontinue flowing through the aorta without applying pressure to damaged area. "Our method gives emergency surgeons a reliable way to repair difficult injuries with readily accessible materials," Dr. Giglia says. "More people can be treated--and potentially saved--with these minimally invasive techniques." St...

Speeding discovery of the 'human cancer genome'

...s, it becomes more likely that a common biological pressure is responsible--more likely that it is an important event," Chin said. Using that strategy in the current study, Chin's group examined genetically engineered mice with melanoma that had developed an increased potential to spread, a process known a...

Carnegie Mellon researchers discover new cell properties

...na is like an egg shell that cracks when excessive pressure or force is exerted against it," Dahl said. "By contrast, normal lamina resembles the rubbery outer shell of a racquetball, which does not break under stress or force but can assume its original shape even after hard play." The researchers also thin...

Chocolate, wine, spicy foods may be OK for heartburn, Stanford study finds

...chocolate and carbonated beverages) can reduce the pressure exerted by the esophageal sphincter, the control v... looked at whether a particular food decreased the pressure exerted by the sphincter or increased the acidity in the stomach, but not at whether taking that foo...

U of M study examines kidney stone prevention in astronauts

...ther twin served as a non-exercising control. The pressure in the chamber was roughly equivalent to what a person would experience running on Earth. Monga found that the non-exercising study participants had higher levels of urinary calcium than the exercising group, and thus had a greater risk of developin...

Human behavior changes the number of strains of infectious diseases

...nteractions take place infrequently there is extra pressure on strains to have a long infectious period." Eames and Keeling focused their study on sexually transmitted infections, where the assumption of monogamy is most applicable, but stress that their conclusions may have wider relevance. "There are im...

Insect predation sheds light on food web recovery after the dinosaur extinction

... the warm wet climate and without insect predatory pressure -- possibly because their rainforest-type leaves were already thick, tough, and hard to eat -- plant species proliferated and thrived for a short time. At Mexican Hat, 16 species of mostly thin-leaved, poorly defended, typical Paleocene plants tempor...

Viagra improves high altitude exercise performance up to 45% for some

...sion. The simulation did not include the lower air pressure that would occur at altitude, Friedlander said. Researchers analyzed the changes in each individual's performance under various exercise conditions and also compared the group's performance under different drug conditions. Responders versus non-re...

NASA technology helping injured US troops

... support their body weight." Using SAM reduces the pressure on the legs, and allows them a chance for increased exercise until they are strong enough to stand on their own. "SAM helps us to help them strengthen their whole lower body. The technology has a lot of promise," said Castleberry. "It's very import...

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