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Tag: "rest" at biology news

Napoleon's mysterious death unmasked, UT Southwestern researcher says

...on Bonaparte's cause of death might finally put to rest nearly 200 years of lingering mysteries about the illness that killed the French emperor during his island exile, a UT Southwestern Medical Center scientist reports. American, Swiss and Canadian researchers applied modern pathological and tumor-sta...

Some caterpillers just don't want to grow up

...rpillars complete development within one year. The rest are inactive in the first season and mature only after two years. "The question puzzling us for some time," says Prof. Jeremy Thomas, director of the CEH in Dorset, "was to understand why so many caterpillars waste one year's time by delaying their d...

Sleep disturbances affect classroom performance

...ce at work the next day, an insufficient amount of rest can also have a negative impact on how well middle or high school students perform in the classroom. A study published in the February 15th issue of the Journal of Clinical Sleep Medicine (JCSM) finds that adolescents who experience sleep disturbanc...

Cancer vaccines -- Taking a jab at cancer by stimulating the immune system

...ertise the presence of the antigen molecule to the rest of the immune system. The antigen, MUC-1, is a protein that is over-produced by pancreatic cancer cells. By presenting patients with MUC-1 on dendritic cells, the researchers expected that they could influence the white blood cells to attack pancreat...

Scientists find potential 'off-switch' for HIV virus

...IV particles didn't 'pop' immediately like all the rest did." Weinberger and Shenk found the answer in a strand of HIV's DNA where a genetic circuit exists -- not an electrical circuit, but a set of chemical reactions that runs in a loop. First, one of HIV's genes creates the Tat protein, which is part...

Indicators for risk of heart disease are higher in passive smokers

...icipants had no detectable levels of cotinine; the rest were classified as having either low or high cotinine. Eighteen percent of participants with low levels of cotinine and 56 percent of subjects with high levels of cotinine reported living with a smoker at home or being exposed to tobacco smoke at wor...

New study sheds light on 'dark states' in DNA

...ate anywhere from 10-50 percent of the time. The rest of the time, energy is dissipated through a set of energy states that do fluoresce in the lab. These "bright" energy states dissipate the energy much faster, in less than one picosecond. A picosecond is one millionth of one millionth of a second --...

Microbes start immune response by sneaking inside cells

...re the body’s front-line defense don’t necessarily rest quietly until invading bacteria lock onto receptors on their outside skins and rouse them to action, as previously thought. In a new paper, University of Michigan scientists describe their findings that bacteria can barge inside these guard cells and...

Soft-cell approach cuts animal tests

... ocean, compared with the animal death toll in the rest of the world. In many inhalation studies, the toxicity of airborne chemicals is tested on laboratory animals by placing them in enclosed chambers and subjecting them to increasing concentrations of the test compounds for specified times until hal...

How trees manage water in arid environments

...ed up by evaporation into the dry air. Most of the rest runs off before it can soak into the ground. Maint...n forests are an important source of water for the rest of such semi-arid regions, and these forests provide relatively isolated conditions where scientists...

Researchers learn what sparks plant growth

...The Salk Institute for Biological Studies, puts to rest a century-old debate over which tissue system in plants drives and restricts cell growth. "Our work exposes the presence of cell-cell communication during growth, from the epidermis to the inner layers. Such a mode of communication is important fo...

In obesity, brain becomes 'unaware' of fat

...y balance in check—fails to engage. Meanwhile, the rest of the metabolic pathway remains ready to respond. “Obesity is not a failure of will power, it is a biological failure,?said Michael Cowley of Oregon Health & Science University of his group’s findings in the mice. “The brain is not aware that t...

Red flag for repetitive stress injuries identified for first time in humans

...s. That way, conservative intervention ?ibuprofen, rest breaks at work, exercise ?can be evaluated as to their effectiveness in preventing the development of chronic work-related conditions and, consequently, the need for more serious measures such as surgery. "If the injury to the tissues can be halt...

Sandia researchers take new approach to studying how cells respond to pathogens

...d microfluidic platform sets Sandia apart from the rest of the world. Sandia researchers have been working in the area of microfluidics -- the science of designing, manufacturing, and formulating devices and processes that deal with volumes of fluid on the order of nanoliters -- since the 1990s and have a...

Left-right wiring determined by neural communication in the embryonic worm

...nslates into a permanent change that lasts for the rest of the animal's life. ...

Genome of yellow fever/dengue fever mosquito sequenced

...TEs are different lineages that co-evolve with the rest of the genome" said Tu. "They evolve different relationships with the genome. Some are genetic parasites; they appear to do nothing except replicate within the genome. Others are used by the host -- the individual organism's genetic machinery --to pe...

HIV survival improves if patients stay in care

...inancial issues. Now they have to stay in care the rest of their lives, which may be 20, 30, 40 or more years." Giordano's study, carried out in the Veterans Affairs population, determined that staying in care made a difference to longevity. Studying those in the VA population eliminated the issue of a...

Percutaneous aortic valve replacement safe, successful in high-risk patients

...culty pumping blood from the left ventricle to the rest of the body. The result is a back-up of fluid into the lungs and severe shortness of breath with even minimal activity. With the CoreValve system, aortic valve replacement is performed by threading a special delivery catheter through the femoral a...

Survival of the rarest: Fruit flies shed light on the evolution of behavior

...ividuals with characteristics that differ from the rest of the population are more likely to survive since their rarity makes them less conspicuous to predators. However, to date we haven't understood this type of survival advantage at the level of the gene." The findings involve a phenomenon known as...

Newborn neurons like to hang with the 'in' crowd

...s, form functional synapses and integrate into the rest of the brain," says postdoctoral fellow Nicolas Toni, Ph.D., who headed the current study. To figure out how the newcomers do it, the Salk researchers injected a virus carrying the gene for green fluorescent protein into the hippocampus, a brain r...

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