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Tag: "sensitivity" at biology news

Hotspots of mercury contamination identified in eastern North America

...rom site-specific characteristics such as the high sensitivity of wetlands and forested areas to mercury inputs. Local sources of mercury are also significant. Although mercury is not directly harmful at ambient levels, it is concentrated up to a millionfold and chemically modified in aquatic food chains, result...

In obesity, brain becomes 'unaware' of fat

...r called SOCS-3 may be responsible for the loss of sensitivity to the fat hormone known as leptin. Therapeutic st...heir brains?appetite control centers also regained sensitivity to leptin. “That was a surprise, a nice surprise,?Cowley said. “We had thought it might be more i...

Study suggests some drug resistance to influenza B medications

...ansmissibility of influenza B viruses with reduced sensitivity to neuraminidase inhibitors in Japan, where zanami...researchers identified a variant with reduced drug sensitivity in one (1.4 percent) of the 74 children who had received oseltamivir, and seven (1.7 percent) of the...

MIT's ocean model captures diversity of underwater forests

...which differ primarily in their size, and in their sensitivity to light, temperature and nutrient availability, then allows the ocean to self-select those most fit for survival in any particular area. What emerged after the model completed its 10-year virtual evolution -which took four to five days on a clust...

Hives ferment a yeasty brew, attract beetle pest

...A. "This indicates strongly that the heightened sensitivity of the beetles to volatiles released from the hive entrance allows them to key in on the bee colonies without bees responding to their attack," the researchers report. Complicating the issue is the yeast that grows in the hives. The researchers foun...

A new portable biosensor detects traces of contaminants in food more quickly and cheaply

...rds the detection of antibiotics, the sensor has a sensitivity of 1 microgram per litre for whole milk, while the legislation allows a maximum of 100 micrograms per litre. Due to the ease of use of this sensor and its portability, the technique can be used in situ for quantitative analysis of the presence of...

Peanut allergies overstated, study finds

... "Diagnostic tests for peanut allergy have poor sensitivity and specificity," the paper concludes. "Previously described diagnostic cut-off levels do not have general applicability." Reasons for this may include variables such as the equipment used and the pressure administered by the practitioner during a...

Dinosaur hearing, listening to muscle noise, quieter cubicles

...cancer lesions and other abnormalities with higher sensitivity and specificity. Extensive tests of the VA imaging technique have been carried out at the Mayo Clinic. (3aBBa7) WORKPLACE SPEECH PRIVACY CALCULATOR Open-plan offices (cubicles) are here to stay. Construction trends continue to bring workers...

DNA repair proteins monitored at double-strand break

...ng problems, such as neurodegeneration, cancer and sensitivity to irradiation leading to double-strand breaks tha...ves its victims at high risk for cancer and higher sensitivity to DNA-damaging radiation. So this work has important medical implications for these and other disea...

Diminishing dinosaur steps saved by laser and laptop

...Karl said: "Due to the fragile environment and the sensitivity of the site we were not permitted direct contact and therefore all measurements had to taken remotely. Dr Manning added: "Laser scanning allowed the rapid, high resolution, 3D digital mapping of an otherwise inaccessible site. The computer-generat...

WHO data confirms low level of resistance to Tamiflu

...etical risk that a virus may emerge with decreased sensitivity to a drug. The Neuraminidase Inhibitor Susceptibility Network undertook screening for susceptibility to oseltamivir of influenza viruses randomly submitted to the national WHO Collaborating Centre for Reference and Research on Influenza and other Re...

Fat screen delivers plant-derived chemical with antidiabetic effects

...a counterintuitive mechanism: they restore insulin sensitivity by activating a central promoter of fat tissue pro...tic mice found that the chemical increases insulin sensitivity in a manner similar to, though more roundabout than, the predominant antidiabetes drugs. Rather than...

8 plants from South Africa may hold potential for treating high blood pressure

...ntional ACEI, captopril was determined to test the sensitivity of the assay. At least three separate determinations were conducted for each test compound. A tannin test was only conducted on those plant extracts that exhibited over 50 percent ACE inhibition in the initial analysis. The data was subjected to Gra...

Global survey of lizards reveals greater abundance of animals on islands than on mainland ecosystems

...ties on islands.? In addition to their increased sensitivity to biological invasions, populations on islands are more vulnerable than those on the mainland to sea level rise and increased storm activity, which are expected by many scientists to become worse as a result of global warming. Jetz and Buckley ga...

'Smart' mice teach scientists about learning process, brain disorders

...aningful to these mice," he said. "The increase in sensitivity to their surroundings seems to have made them smarter." The engineered mice were more adept at learning to navigate a water maze and remembering that being in a certain box involves a mild shock. Equally important, Dr. Bibb said, when a situtation...

Penn researchers link cell's protein recycling systems

...hat the level of the HDAC6 in a cell regulates its sensitivity to accumulation of misfolded proteins, and that increasing the activity of HDAC6 can prevent the degeneration normally associated with accumulating old, damaged proteins. The researchers suggest further that when proteasomes are impaired or overwhelm...

In mice, drug protects against diabetes and atherosclerosis

... cholesterol -- and significantly improved insulin sensitivity compared to control mice. Tests also showed that the drug reduced the activity of gene pathway called JNK that triggers the inflammatory and insulin-resistance responses to fatty diets. As an "added bonus," commented Hotamisligil, the drug also ex...

Old memory traces in brain may trigger chronic pain

...motional suffering from pain as well as reduce the sensitivity of the formerly injured site. It also controlled nerve pain resulting from chemotherapy, noted Apkarian, who is a member of the Robert H. Lurie Comprehensive Cancer Center at Northwestern University. The drug has long-term benefits. Animals ...

Pregnant mom's exposure to flu vaccine kick-starts fetal immune system

... may have an effect on the development of allergic sensitivity (e.g. eczema and asthma) later in an infant’s life. However this hypothesis has remained controversial because of an inability to detect antigen-specific T cells in cord blood. Recently, a newly developed technique known as MHC tetramer staining has ...

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