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Tag: "concentrations" at biology news

Study finds 60 new genes controlled by DNA snippet

...ce the same protein at different times, places and concentrations with subtly different roles. "Humans share about one quarter of their genes with fish," Miano said. "Something must be at work to explain why we are so many times more complex. Regulatory sequences offer one of several emerging explanations for h...

Possible brain hormone may unlock mystery of hibernation

...n, they added. The researchers earlier found that concentrations of "hibernation-specific protein" complex (HPc) de...In 20 hibernators examined throughout their lives, concentrations of HPc in the blood started to decrease prior to hibernation and remained low throughout the inactiv...

Pesticides in the nation's streams and ground water

...eport also concludes that pesticides are seldom at concentrations likely to affect humans. However in many streams,...n and agricultural areas, pesticides were found at concentrations that may affect aquatic life or fish-eating wildlife. Dr. Robert Hirsch, Associate Director for Wa...

Weighting cancer drugs to make them hit tumors harder

... � 2 million molecular weight -- achieved better concentrations in tumors than a lower molecular weight, the study showed. Chilkoti said chemotherapy by itself is small enough to travel throughout the body via the bloodstream, causing toxicity to vital organs such as the liver, bone marrow and heart. Likewise, c...

Albatross study shows regional differences in ocean contamination

...California Current system has significantly higher concentrations of these contaminants," Finkelstein said. The re... food chain. Analysis of blood samples showed that concentrations of these compounds in black-footed albatrosses were 370 to 460 percent higher than in Laysan albatro...

Vegetables inhibit growth of prostate cancer in mice with human tumors

...California Current system has significantly higher concentrations of these contaminants," Finkelstein said. The re... food chain. Analysis of blood samples showed that concentrations of these compounds in black-footed albatrosses were 370 to 460 percent higher than in Laysan albatro...

Alaska seal pup diet may hold key to decline of population

... if one group grows more quickly. Monitoring the concentrations of cortisol, in response to a stressor that dilates the pupils and increases heart beat. Animals in the low fat group may take a longer time to recover. Comparing their data with observations and tests on seals in the wild done by the Alaska Departm...

Ocean acidification threatens cold-water coral ecosystems

...this layer of supersaturated water is shrinking as concentrations of CO2 increase. "Scientists have known for years that shallow-water tropical coral reefs are threatened by both warming oceans and chemical changes in seawater caused by the build-up of CO2 in the atmosphere. Above-average seawater temperatures ha...

Honey helps problem wounds

...hydrogen peroxide from the chemist's is that small concentrations are sufficient to kill the germs, as it is constan...ide loses its potency over time. However, in large concentrations it not only damages the bacteria, but also the skin cells. Furthermore, medihoney consists of two d...

Chemical in many air fresheners may reduce lung function

...esearchers examined the relationship between blood concentrations of 11 common volatile organic compounds and lung f...ctions in pulmonary function with increasing blood concentrations of 1,4 DCB. There was approximately a 4 percent decrease in the test which measures forced expir...

Synthetic molecule causes cancer cells to self-destruct

...more procaspase-3 resulting in cell death at lower concentrations of PAC-1. "This is the first in what could be a host of organic compounds with the ability to directly activate executioner enzymes," said Hergenrother, who is also an affiliate of the Institute for Genomic Biology at the U. of I. "The potential eff...

Pest control research leads to pain control discovery

...en combined with Vioxx can dramatically reduce the concentrations of the Cox 2 inhibitor needed," Hammock said. "The combination of Vioxx with the new sEHIs shifts blood chemistry toward the normal condition which may reduce the tendency toward blood clots," said UC Davis scientist Bora Inceoglu, a post-doctoral ...

Study reveals how ADHD drugs work in brain

...wn as microdialysis - the UW-Madison team measured concentrations of dopamine and norepinephrine in the three different brain areas, both in the presence and absence of low-dose ADHD stimulants. Under the influence of ADHD drugs, dopamine and norepinephrine levels increased in the rats' PFC. Levels in the accumben...

Many cleaners, air fresheners may pose health risks when used indoors

.... The study is the first to measure emissions and concentrations of primary and secondary toxic compounds produced by these products under typical indoor use conditions, and it examines the potential hazards of small-scale yet widespread utilization of an array of products designed for household use. "We've focus...

Microbes hitchhike across Atlantic on desert dust

... of airborne dust should correspond with increased concentrations of airborne microorganisms," says Griffin Viable bacterial and fungal populations were collected on 24 of 40 sampling days. The three days where the highest populations were collected corresponded with the two highest periods of dust activity as de...

DOE JGI sequences, releases genome of symbiotic tree fungus

...eader. "The steady rise of global atmospheric CO2 concentrations suggests that we are on the trajectory for serious environmental problems. This situation could be eased by modeling and actively managing the complex relationships between trees and fungi," said Martin. Key factors behind the ability of trees to...

Sandia work launched on space shuttle shows live cells influence growth of nanostructures

...ng spin-coating, the cells react to the increasing concentrations of materials in the developing silica nanostructure by expelling water and developing a gradient in the local pH. This in turn influences lipid organization and the form of the silica nanostructure, reduces stress, and ultimately improves the living ...

High-dose flu vaccines appear to safely boost immunity in elderly

... who received higher dosages of vaccine had higher concentrations of antibodies against the flu virus in their blood one month later. In addition, a larger percentage of those who received the higher-dose vaccines had what physicians believe is a sufficient immune response to protect them from developing the flu i...

How IVF could be causing genetic errors in embryos

...e embryos had shown that certain culture media and concentrations of oxygen altered the expression of several imprinted genes. Imprinting is the process by which some genes are activated or inactivated depending on whether they have been inherited in chromosomes from the mother or the father. Professor Paolo F Ri...

New egg freezing technique offers hope to hundreds of women

...ng a multi-step procedure that involved increasing concentrations of ethylene glycol (EG) as a CPA. Twelve were frozen using propane-1,2-diol (PrOH) and two different amounts of sucrose as CPAs. After thawing, the eggs were studied using light and transmission electron microscopy (LM and TEM). The eggs appeared no...

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