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Tag: "low" at biology news

Environmental chemical cocktail may sabotage sperm

...enic xenobiotics [chemicals] are effective at very low concentrations, with combinations of compounds bei...oestradiol. Yet human sperm are responding to very low concentrations ?well within the amounts that have been measured in people's blood. "At a time when ...

Insects develop resistance to engineered crops

..., the researchers bred moth populations in which a low percent of the moths were resistant to a single Bt toxin. The insects were then released into caged growing areas with either single-gene plants, dual-gene plants or mixed populations and allowed to reproduce for two years. The researchers found tha...

Sandia completes depleted uranium study

...and is called depleted uranium. The high density, low cost, and other properties of DU make it an attractive choice as an anti-tank weapon. However, on impact, DU particulate is dispersed in the surrounding air both within and outside the targeted vehicle and suspended particulate may be inhaled or inge...

Size matters: Preventing large mammal extinction

...decline and extinction. Biological traits such as low population density, slow life history, late weaning age and extended gestation in mammals above a certain size means they are evolutionarily disadvantaged in the face of human impact, compared to species of smaller size. Large mammals may therefore n...

Plankton can run, but can't hide from basking sharks

... shark Rhincodon typus and the basking shark, have low population levels as a result of human exploitation. Data on population sizes for these species are lacking, and diving behaviour is one factor contributing to surveying bias," the authors say. Unless adjusted to account for these differences in divi...

Millennium Ecosystem Assessment: Many of 2 billion dryland dwellers at risk as land degrades

...mony' was a default result of smaller populations, low stocking rates, and large areas to forage on. The ...m sources typically located outside drylands. The low average water availability in drylands today (1,300 cubic metres per capita per year, already below ...

Woods Hole Research Center plans controlled burn in Amazon rainforest

...ransformation in the Amazon landscape. Every year, low intensity fires burn thousands of square miles of ...cumulated on the forest floor. But in spite of the low stature of this first fire, many trees died through 'girdling' of their trunks ?the fire lingered cl...

Gambling monkeys give insight into neural machinery of risk

... "For example, it is believed that people who have low levels of the neurotransmitter serotonin might be more risk prone and impulsive," said Platt. "Disturbances in such neurotransmitter systems might be the basis of pathological conditions like pathological gambling, obsessive-compulsive disorder and d...

Engineered molecule amplifies body's immune response

... benefits of increased Stat1 signaling even at the low levels of interferon normally present in the body. Their results appear as the "Paper of the Week" in the October 7 issue of the Journal of Biological Chemistry, an American Society for Biochemistry and Molecular Biology journal. "Our paper is reall...

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

...quist. Once there, it remains in a diffuse form at low levels, limiting its visibility to the immune system. Only after the epithelial cells begin differentiating does the virus emerge as distinct, infective viral particles, called virions. Thus, said Ahlquist, infectious HPV virus particles could only ...

Genetic discovery could lead to drought-resistant plants

... the cooling rates of plants with normal, high and low levels of gene activity. From their data, they were able to link the gene to plant exhalation. The discovery is another step in understanding how plants respond to their environment. In hot temperatures, plants keep their mouths "shut" longer than u...

Gene therapy to lower blood pressure just enough

...kind of gene reduced blood pressure to dangerously low levels, said O'Malley. Obviously, a method of controlling the gene and the amount of ANP a cell makes was needed. The special viral vector developed by O'Malley and his colleagues combines a special kind of adenovirus altered so it does not produce ...

Structures of marine toxins provide insight into their effectiveness as cancer drugs

...r cells. Moreover, initial work shows that even a low dose of these toxins can bring a significant response." Prior to the study published in PNAS, it was known that the marine toxins affect several forms of cancer - but not how they worked, says Rayment. The recent findings will enable the toxins to b...

Seaweed could make junk food healthier

...d which usually contain large amounts of fat and a low degree of healthy nutrients, say the team. Scientists at the University of Newcastle upon Tyne publish their findings in the academic journal Critical Reviews in Food Science and Nutrition, in a paper detailing alginate's many benefits to the body. ...

Neurologix announces positive results of gene therapy clinical trial in Parkinson's disease

...rts. Seven of the eight patients representing the low and mid-dose cohorts have now been evaluated one year following treatment. Three of the remaining five subjects have been followed for six months and the remaining two for more than four months. The trial results were presented by Andrew Feigin, M....

Duke Experiments Boost Radiation's Cancer-Killing Effects

...how HIF-1 behaves in a cancer cell. Cells that are low in oxygen or "hypoxic" do not respond as well to radiation and chemotherapy. Blocking HIF-1 production does not increase oxygen levels, but it does alter the behaviors that are caused by hypoxia. Similarly, tumors with an intact tumor suppressor gen...

IBM Transforms the Art of Scientific Expeditions

...how HIF-1 behaves in a cancer cell. Cells that are low in oxygen or "hypoxic" do not respond as well to radiation and chemotherapy. Blocking HIF-1 production does not increase oxygen levels, but it does alter the behaviors that are caused by hypoxia. Similarly, tumors with an intact tumor suppressor gen...

Envisat and ERS-2 reveal hidden side of Hurricane Rita

...e, powerful storm centred around a zone of extreme low pressure. Strong low-level surface winds and bands of intense precipitation combine strong updrafts and outflows of moist air at higher altitudes, with energy released as rainy thunderstorms. Envisat carries both optical and radar instruments, enab...

Past droughts geographically widespread in the West, according to tree-ring data

...he tree-ring study: Extreme events, either low flows or high flows, tended to occur simultaneousl...n any four-year period, having either high flow or low flow for two consecutive years occurred more than 20 percent of the time; For the Salt/Verde ...

Microbe has huge role in ocean life, carbon cycle

...the world's oceans. In a marine environment that's low in nutrients and other resources, they are able to survive and replicate in extraordinary numbers ?a milliliter of sea water off the Oregon coast might contain 500,000 of these cells. "The ocean is a very competitive environment, and these bacteria ...

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