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Tag: "concentrations" at biology news

Novel gene-silencing nanoparticles shown to inhibit Ewing's sarcoma

... to deliver these bits of genetic material in high concentrations to specific tumor sites, while avoiding degradation. To overcome these hurdles, the scientists employed a sugar-containing polymer invented by chemical engineers at the California Institute of Technology. For this experiment, the polymer binds to an...

Oceans more vulnerable to agricultural runoff than previously thought, study finds

...f California contains some of the highest nutrient concentrations in the oceans and sustains highly elevated rates of biological productivity." In the gulf, wind-driven upwellings regularly bring nitrogen and other nutrients from the seafloor to the surface, stimulating the rapid reproduction and growth of microsc...

Could microbes solve Russia's chemical weapons conundrum?

...n the RM ?for growth. The results showed that the concentrations of each PHT derivative decreased significantly whe...d constant. When no bacteria were present, the PHT concentrations also remained constant. The authors conclude that the 1,4-perhydrothiazines undergo transformation ...

Study uncovers bacteria's worst enemy

...xic to bacteria only at high levels far, far above concentrations at contaminated sites, and that common toxic metals, such as cadmium, nickel, and chromium, are more likely to cause problems for the bacteria." Generally, bacteria used for bioremediation are selected to target a specific form and oxidation state o...

Man-made wetland's effectiveness similar to natural marsh

...ty significant reduction in phosphorus and nitrate concentrations ?close to the kind of decrease we typically see in...ples twice each month. They tested the samples for concentrations of phosphorus, nitrates and several other chemicals. The researchers also gathered data on water fl...

Too much water may be as dangerous as too little during long-distance athletic events

...se. The drinks often carry more water with smaller concentrations of salts than are normally found in the human body...lly gained weight during the race and their sodium concentrations were very low - some were dangerously low," Dr. Levine said. "The recommendations listed in the stud...

Bush, Cheney and Rumsfeld are now species of slime-mold beetles -- but strictly in homage

...se. The drinks often carry more water with smaller concentrations of salts than are normally found in the human body...lly gained weight during the race and their sodium concentrations were very low - some were dangerously low," Dr. Levine said. "The recommendations listed in the stud...

New design : complete

...se. The drinks often carry more water with smaller concentrations of salts than are normally found in the human body...lly gained weight during the race and their sodium concentrations were very low - some were dangerously low," Dr. Levine said. "The recommendations listed in the stud...

Currents could disrupt ocean food chain

...ges, which coincide with changes in ocean nutrient concentrations measured in deep-sea sediment cores. "One full oscillation of these switches took 1,500 years," Schmittner said, "but the individual transitions happened surprisingly fast. The climate went from a cold state to a warm state in as little as 20 to 50 ...

At the molecular level, the predator is the prey

...topuses and primitive chordates. It is used in low concentrations to treat morphine and heroine addicts. It's also the "zombie" drug used by Haitian voodoo ritualists. Despite its action at the molecular level, the evolution of TTX in some organisms is viewed by ecologists as a defense mechanism. In the case of T....

Chemical Engineer Kao Explores Antibiotic Synthesis With DNA Chips

...bind to the DNA already on the microarray, and the concentrations accurately reflect gene expression. In Kao's experiment, DNA copies of RNA from cultures of erythromycin-producing bacteria were infused with fluorescent dye and applied to the microarray. "This experiment revealed that the RNA transcript abundance...

Second messenger NAADP shows fast, dose-related impact on satiety cycle

...ect NAADP level, even when applied at supramaximal concentrations in terms of physiological relevance and which saturate the calcium amplitude and spiking frequency. In conclusion, Yamasaki said, "Our data in this experiment provides the first direct evidence that cholecystokinin elicits a rapid, dose-dependent an...

Antiretroviral Therapy May Prevent HIV Transmission From Breastfeeding Mothers To Infants

...l medications on to their breastfeeding infants in concentrations high enough to prevent infection. The second study.... In the first study, the researchers measured the concentrations of three antiretroviral drugs, nevirapine, lamivudine, and zidovudine, in the blood and breast milk ...

Discovery of New Dopamine Action May Yield Alternative Psychiatric Drugs

...iated with triggering feelings of pleasure, excess concentrations of dopamine underlie schizophrenia, attention deficit hyperactivity disorder and other psychiatric conditions. The findings therefore provide new research avenues to understand and potentially manage such dopamine-related human disorders, the researc...

Bacteria feed on smelly breath (and feet)

...eria and their possible relationship with the oral concentrations of methylated sulphides. This may lead to a natural way of reducing smelly breath and feet. ...

First production of human monoclonal antibodies in chicken eggs published in Nature Biotechnology

...he chicken oviduct and deposited into egg white in concentrations of 1-3 milligrams per egg. Moreover, antibodies produced in this manner demonstrated 10-100 fold greater cell-killing ability (ADCC) compared to therapeutic antibodies produced by conventional cell culture methods. The new report was published in th...

Newly discovered genetic disease sheds light on body's water balance

...nt. As water flowed out of their bodies and sodium concentrations returned to normal, both babies recovered. They continue to be followed by the UCSF team. Next Gitelman, Rosenthal and Feldman took blood samples from each baby boy and his mother to search for the cause of the unique disorder. They learned that Ray...

Environmental chemical cocktail may sabotage sperm

...so normally you would expect them to have to be in concentrations around 1,000 times stronger to get a response simi...radiol. 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 there are conce...

Measuring hidden parasites in falciparum malaria

...ion deaths annually. Estimates of plasma PfHRP2 concentrations may be useful as a research tool to assess patients' parasite loads and may also provide one way of assessing the severity of a patient's disease. ...

UNC computer, marine scientists collaborate to predict flow of toxic waters from Katrina

...ily forecasts of coastal circulation and pollutant concentrations in the Katrina-affected region, information that will be vital as cleanup efforts and recovery continue. The two also have extended their work with RENCI, Reed and colleagues to analyze various aspects of last weekend's Hurricane Rita and its effect...

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