concentrations 2 7

Tag: "concentrations" at biology news

Study links high levels of nitric oxide to infertility and sperm DNA damage

...such as motility, viability and metabolism. At low concentrations it can have a positive effect on cells, but a nega...we discovered that there were significantly higher concentrations of nitric oxide in the seminal plasma of infertile patients than in healthy men. High concentrations...

EGF receptor activation prevents microbes from going more than skin deep

... was increased by activation of EGFR, and that the concentrations of AMPs in the epidermis of wounded skin exceeded those necessary to suppress or prevent the growth of foreign microbes. The results of this study demonstrate that wounding of the skin alone, without the presence of microbes, is sufficient to activat...

Natural vitamin E tocotrienol reaches blood at protective levels

...rmined that a moderate dose of tocotrienol reached concentrations in human blood plasma that would be more than adeq...at when administered orally, tocotrienol can reach concentrations needed to serve these dual protective functions," said Chandan Sen, professor and vice chair of surg...

Coming soon: 3-D imaging that flies 'through' and 'around' cancer

...ls, and the radiopharmaceutical is drawn in higher concentrations to cancerous areas. The highly sensitive PET scan picks up the metabolic signal of actively growing cancer cells. The CT scan generates a detailed picture of internal anatomy, locating and revealing the size and shape of abnormal cancer growths. When...

Smell of success for nanobiosensors

...ts, the system is capable of detecting odorants at concentrations that would be imperceptible to humans. "Our tests showed that the nanobiosensors will react to a few molecules of odorant with a very high degree of accuracy. Some of the results of the trials surpassed even our expectations," Samitier says. These t...

Links between DNA damage and breast cancer studied

...yoepithelium and stroma and found that the highest concentrations of this lesion tended to occur in women in the 33-...r. In a second paper, the team studied age-related concentrations of two similar mutagenic DNA lesions and again demonstrated that their occurrence is roughly commens...

The Midas Bug -- the bacterial alchemy of gold

... R. metallidurans is that it is able to survive in concentrations of gold that would kill most other micro-organisms." This research has significance for the mineral exploration industry ?as current models of gold formation do not include a biological mechanism. "There may be new opportunities for the bio-proc...

Record air pollution above the Arctic

...truments displayed significantly increased aerosol concentrations compared to those generally found. Aerosols from e...itute for Air Research (NILU) found extremely high concentrations of ozone above ground. With more than 160 micrograms ozone per cubic metre, these values are the hig...

Pollutant haze heats the Arctic

...mospheric Administration research station measured concentrations of particulates, mostly sulfates from coal-burning...e Valley," says Garrett. "These [Arctic pollution] concentrations can get very high in winter and spring for exactly the same reasons Salt Lake has high pollution. Th...

Gardenia fruit compound starting point for diabetes therapy

...eficiency or insulin resistance causes blood sugar concentrations to rise. The team discovered that Gardenia extrac...nother mechanism. In both animals and humans, high concentrations of UCP2 appear to inhibit insulin secretion from the pancreas and increase the risk of type 2 diabet...

Researchers discover how bacteria sense their environments

...n sense in their environments changes in molecular concentrations as small as 0.1 percent, the equivalent of one drop diluted in a pool of a 1,000 drops. How do they do it? New Cornell research, highlighted on the cover of the May issue of Nature Structural and Molecular Biology, reveals that receptors assemble i...

Epstein-Barr virus might kick-start multiple sclerosis

...o investigate what causes these increased antibody concentrations and if T cell responses to EBV are different in patients with MS," Lünemann said. He and Edwards focused on one viral protein, called Epstein-Barr virus-encoded nuclear antigen1 (EBNA1). Epstein-Barr virus usually persists life-long inside immune s...

Blood transfusion-transmitted infections: A global perspective

...those viruses that are present in exceedingly high concentrations in blood. Newer technologies can also have a downside, notes Blajchman. They tend to reduce the effectiveness of the blood components, necessitating the transfusion of greater quantities and thus exposing patients to blood from more donors; ther...

UCSD study reveals how plants respond to elevated carbon dioxide

... rapid increases and then decreases in calcium ion concentrations within cells--changed in frequency according to atmospheric carbon dioxide levels. As the carbon dioxide concentration was increased, the rapid drum roll of calcium spikes within the cells changed to a slower beat. The cells responded by reducing the...

Solvent exposure linked to birth defects in babies of male painters

...f reported cases, is the first of its kind to link concentrations of solvents in the air to these health outcomes, said Dr. Igor Burstyn, a University of Alberta professor of occupational and environmental health, who co-authored the study with researchers from Radboud University Nijmegen Medical Centre in the Neth...

Increase in carbon dioxide emissions accelerating

...ns are supported by measurements of the subsequent concentrations of carbon dioxide in the atmosphere. Dr Paul F...ne and Atmospheric Research, says that atmospheric concentrations of carbon dioxide grew by two parts per million in 2005, the fourth year in a row of above-average g...

Smoking changes brain chemistry

...ine-dependent patients had significantly decreased concentrations of the amino acid N-acetylaspartate (NAA) in the a...buse, particularly alcohol dependence. Choline concentrations in the ACC were slightly lower in the smokers compared with the nonsmokers, and lower still in the f...

New evidence of early horse domestication

...ed for nitrogen, phosphorus, potassium, and sodium concentrations by Rosemary Capo, University of Pittsburgh geochemist, and her students. Modern horse manure is rich in phosphorous, potassium, and especially nitrogen, compared to undisturbed soils. But because nitrogen is mobile in soils, it can be lost to groundw...

New biochip helps study living cells, may speed drug development

...ey enter and exit cells. The chip can record these concentrations in up to 16 living cells temporarily sealed within...rterfield said. The chip also directly records ion concentrations without harming the cells, whereas present methods cannot directly detect specific ions, and cells b...

Researchers reveal mystery of bacterial magnetism

...t being magnetic helps a bacterium find the oxygen concentrations it prefers more quickly by swimming only up and down in the earth's magnetic field rather than randomly in all directions. An analogy would be a blind-folded mountain climber searching for a specific altitude. If she only climbs straight up or down...

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