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Tag: "pressure" at biology news

UCLA scientists strengthen case for life more than 3.8 billion years ago

...not be ascertained, Mojzsis said, because heat and pressure over time have destroyed any original physical structure of the organisms. Harrison said of UCLA's ion microprobe and the research: "The individual samples are very small, and no other instrument would have been sensitive enough to reveal precisely...

Seeing the serpent

...eatened by snakes show fewer signs of evolutionary pressure to evolve better vision. For example, the lemurs of Madagascar do not have any venomous snakes in their environment, and in evolutionary terms "have stayed where they are," Isbell said. In South America, monkeys arrived millions of years before venom...

Internal body clock dictates timing of different types of stroke

...gun earlier, say the authors. Sleep lowers blood pressure in the body, so cuts the risk of stroke, but low blood pressure is a risk factor for cerebral infarction, say the authors....

Bedsores and bald hides: Novel roles revealed for a 'scaffolding' protein

... for preventing or treating chronic wounds such as pressure or bed sores arising from long periods of immobility. Along with the pain and scarring, bed sores significantly increase health care costs in nursing homes and hospitals. A separate report by the same Hopkins group, published in the May 15 issue of...

Study shows pine bark naturally decreases severe chronic venous insufficiency

...he weight of excessive blood, which then adds more pressure onto the next valve further downwards. Ultimately... When edema is successfully treated, the increased pressure on veins gets normalized, preventing the veins from further increasing in size. "Pycnogenol® has d...

Diabetes hits 275 Australians each day as pandemic spreads

...n those with normal weight People with high blood pressure were 3 times more likely to develop diabetes than those who had normal blood pressure, and People who are physically inactive had twice the risk of developing diabetes than those who were active. Professor Zimmet said, "There is no doubt that diab...

Federal testing for mad cow disease a failure, law review editor says

...ved that Prime Minister Junichiro Koizumi is under pressure to lift the Japanese ban before his visit to the U.S. next month. These incidents underscore the need for the USDA to end its head-in-the-sand approach and begin "a mix of mandatory and voluntary testing to ensure the largest possible number of catt...

Hopkins scientists show hallucinogen in mushrooms creates universal 'mystical' experience

...ect, non-laboratory lighting. Heart rate and blood pressure were measured throughout. The researchers countered "expectancy" by having both monitors and subjects "blinded" to what substance would be given. For ethical reasons, subjects were told about hallucinogens' possible effects, butalso learned they co...

Researchers appeal for new regulations to save coral reefs from live fish trade

...g bandits. The live fish trade is an increasing pressure on coral reef resources, both in terms of magnitude and geographical spread. The combination of destructive harvesting methods and over-harvesting of large, predatory fish reef fish have devastating effects. Being able to choose a huge fish to eat ...

Proteins as parents

...es the heart the necessary stability to resist the pressure of the inflowing blood. As the parent generation, the scientists chose two globular titin domains called I27 and I32, whose mechanical properties have already been intensively researched. Both are similarly built and are composed of the protein seg...

Research offers new hope for preterm babies

...udies to understand the relationship between blood pressure and the amount of oxygen in a preterm baby's brain...." "In healthy, full-term babies, a drop in blood pressure would generally not have such serious consequences, as these babies appear to 'auto-regulate' blood ...

New understanding of parasite cell structures may provide treatments for serious tropical diseases

...sponse to cell stress caused by changes in osmotic pressure and relative acidity or alkalinity. The research by the UGA team is especially important in better understanding the parasite Trypanosoma brucei, which causes human African trypanosomiasis, a disease that affects more than 66 million women, men and ...

Researchers to develop ultra-miniature implantable sensors to measure blood flow

...will someday monitor a patient's blood flow, blood pressure and temperature with tiny, implanted devices, thanks to research being conducted by a Cornell University professor and an Ithaca-area high-tech firm. This new technology is being developed by Edwin Kan, associate professor of electrical and compute...

Study identifies substances in grapefruit juice that interact dangerously with some drugs

...dications, including some drugs that control blood pressure or lower cholesterol. Studies have shown that grapefruit juice can cause more of these drugs to enter the blood stream, resulting in undesirable and even dangerous side effects. The drugs affected by grapefruit juice usually have some difficulty en...

Nanosecond-scale release of stinging jellyfish nematocysts

...r-surface tissue. It was known already that a high pressure (15 MPa) drives nematocyst discharge, and that sty...he accelerated mass is very small (~1 nanogram), a pressure generated at the site of impact is more than 7 GPa, which is in the range of that generated by some ...

Study challenges myth that sex late in pregnancy hastens birth

...omen who experience abdominal discomfort or pelvic pressure ?possible signs of earlier delivery ?won't be inclined to want to have sex. Schaffir also said that because of the highly personal nature of sexual behavior, the study does not address specific components of sexual behavior that might have varying ef...

New angiogenesis finding may help fight cancer growth

...ndrome called preeclampsia, in which soaring blood pressure and low blood oxygen levels harm or even kill pregnant women and their babies. Philip Lowry, at the University of Reading in the United Kingdom, has found that NK-B levels spike in preeclampsia, and the new understanding of NK-B's role in angiogenesi...

A human taste for rarity spells disaster for endangered species

...d trophy hunting collectors have placed increasing pressure on rare species as their focus has shifted from killing the most dangerous animals to killing the rarest. The pursuit of social status and health can also trigger the anthropogenic Allee effect, as many rare species are coveted as luxury items--wheth...

Honey bee genome holds clues to social behavior

...ee genome for clues for social cues ?a form of bee pressure that can cause bees to change jobs in response to needs of the hive. "We want to learn how the honey bee society influences behavior in individual honey bees," said Sinha, who is lead author of a paper that will be posted online this week ahead of ...

Like a snail through the intestinal canal

...ibility of movement. A snail uses the exertions of pressure to change the characteristics of the middle layer,...tion, in order to move. In the intestine, however, pressure cannot be exerted, because this would cause the intestine to become deformed. The solution then is f...

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