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Tag: "concentrations" at biology news

Researchers examine why food tastes bad to chemotherapy recipients

...eriments in order to conduct experiments at higher concentrations without endangering anyone, Dietrich added. Perception of taste and odor is very complex, and like nutritional needs, varies depending on age, gender, race, health status, prior exposure and experience. Two graduate CEE students, Pinar Omur-Ozbek ...

Too mellow for our predatory world

...ly the act of being captured that led to increased concentrations of corticosterone, and the flight distance only increased in those animals that had already been once caught. In contrast, the reptiles living with acute predation pressure responded to the harassment experiment with an immediate increase in CORT lev...

Therapeutic role found for carbon monoxide

...ave shown that when administered at low, non-toxic concentrations prior to such procedures as organ transplant surge...fer the exciting possibility that in extremely low concentrations and for brief intermittent exposures of one hour per day, CO gas might be effectively used as a ther...

Dragonfly's metabolic disease provides clues about human obesity

... experiments also found the hemolymph carbohydrate concentrations in parasite-infected dragonflies to be about doubl...howed effects in two days. Abnormal blood glucose concentrations are a symptom of metabolic syndrome in humans. Marden and Schilder also concluded that insects may ...

Brains can recover from alcoholic damage but patients should stop drinking as soon as possible

...was not simply due to rehydration of the brain, as concentrations of choline and NAA increased even when water levels and other metabolites did not change significantly. "Our results indicate that early brain recovery through abstinence does not simply reflect rehydration. Instead, the adult human brain, and par...

Soil nutrition affects carbon sequestration in forests

...g of how forests respond to increasing atmospheric concentrations of carbon dioxide (CO2), the major greenhouse gas ...of towers that provide CO2 to increase atmospheric concentrations of the gas around the selected trees. At the Duke FACE experiment, half of each ring was fertilized ...

High HPV concentrations combined with smoking significantly raise risks of cervical cancer

...e women, they compared their smoking behavior with concentrations (known as viral load) of HPV-16, the viral strain most associated with cervical cancer. The researchers found that a combination of high viral loads and smoking during the time they were initially examined resulted in very high risk of later cervical...

Motorola researchers develop selective sensors based on carbon nanotubes

...ated electronic circuitry, you can detect very low concentrations of analytes." The researchers now will investigate the use of the sensors on biological molecules, like RNA sequence detection, Tao and Forzani said. ...

Report calls for improved monoclonal antibodies against solid tumors

...ss to all viable cells within tumors at sufficient concentrations to effect a maximal change in the tumor.?This is affected by several factors, including the characteristics of the tumor, the antibody, and the target. “The complexity of this problem?can be illustrated in the authors?discussion of antibody affinity....

U-M researchers use nanoparticles to target brain cancer

...llionth of a meter in size can be loaded with high concentrations of drugs designed to kill brain cancer. What's more, these nanoparticles can be used to image and track tumors as well as destroy them, according to researchers at the University of Michigan Comprehensive Cancer Center. Researchers incorporated a dr...

Key to acute lung injury lies in Ang2 protein

...y caused by cell death, high and potentially toxic concentrations of oxygen (hyperoxia), and the resulting excess fl...iator of cell death in the settings of high oxygen concentrations in the lung causing acute lung injury and pulmonary edema." Bhandari said the study is an example...

Longer-lived rodents have lower levels of thyroid hormone

...ended longevity tend to have lower thyroid hormone concentrations than shorter living strains," the authors wrote. "Significant declines in thyroid hormone correlate well with enhanced maximum lifespan." The study compared the levels of these thyroid hormones among four groups of rodents with different life span...

Sports cheats beware -- new test detects previously undetectable drug

...ven though it will only be found in incredibly low concentrations in a person's blood sample. Synacthen is a protein, and scientists have developed a method that can specifically search for the minute traces of synacthen in a blood sample. Called immunological purification, this technique can find any synacthen ...

Researchers link ocean organisms with increased cloud cover and potential climate change

...ay have contributed to a doubling of cloud droplet concentrations seen over a large area of ocean off the eastern coast of South America. Using complex numerical models, they estimated that the resulting increase in cloudiness reduced the absorption of sunlight by an amount comparable to what has been measured...

Diabetes slows nerve recovery after heart transplant

...t produces. Such a deficiency results in increased concentrations of glucose (sugar) in the blood, which can damage many of the body's systems. Diabetes mellitus is a known major risk factor of heart disease, negatively affecting the heart's contraction and rhythm, said Bengel. Future research will need to focus...

Math model predicts cancer behavior

... conditions: these include the oxygen and nutrient concentrations and the landscape of connective tissue that surrounds the cells. They were surprised to find that the microenvironment around the tumor determines both the tumor's shape and its composition. "What we get is a picture of cells that are evolving and ...

Low levels of neurotransmitter serotonin may perpetuate child abuse across generations

...heir cerebrospinal fluid to measure the metabolite concentrations of brain neurotransmitters such as serotonin every six months. They followed the infants until they became mothers themselves and studied their maternal behavior to note any abusive behaviors toward their infants. The team found that infants who be...

Monitoring poisons in the environment -- a woolly matter

...a bio-indicator of naturally occurring heavy metal concentrations in upland areas, which have previously not been as... stuck to the outside of the wool. Copper and lead concentrations were then determined using highly sensitive equipment which can accurately detect very small quantit...

Widely used hepatitis B drug spurs HIV drug resistance

...d techniques. She and her team combined various concentrations of entecavir with 100,000 human immune cells from ...of HIV. Lab results showed that entecavir, in concentrations less than a tenth of what is used in humans, cut the number of newly infected cells in half. Howeve...

Pharmaceutical compounds found in nation's fresh water

...t know what toxicological effects these detectable concentrations of pharmaceuticals pose, although typical concentrations in one liter of ground water are usually much lower than a typical human therapeutic dose," says lea...

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