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Tag: "varies" at biology news

Wolves are suffering less from inbreeding than expected

...re of the proportion of the DNA that is inbred. It varies between 0 and 100%. If a brother and sister are mating, their offspring will have an inbreeding coefficient of 25%. This is about the average level for the present wolf population in Scandinavia. And our analyses have shown that inbreeding is negativ...

Ocean temperature predicts spread of marine species

... can predict how the distance marine larvae travel varies with ocean temperature ?a key component in conservation and management of fish, shellfish and other marine species ?according to a new study from the University of North Carolina at Chapel Hill. Most marine life, including commercially important spe...

Complexity constrains evolution of human brain genes

...her than the brain have shown that gene expression varies widely. Other studies have found that, within the brain, the abundance of expressed genes per neuron appears to be greater in humans. "On the basis of individual neurons of the brain, humans may indeed have a far more active, or even more complex...

Microcapsules like it hot and salty

...sules with an original diameter of 4.5 micrometers varies from 1.5 to 20 micrometres (see fig.). However, it is not just in the laboratory that the size of the capsule can be adjusted precisely. The scientists also have a theoretical understanding of the processes in the capsule wall, which means...

Minorities, uninsured less likely to receive care at high-volume hospitals

...determine whether the use of high-volume hospitals varies by race/ethnicity or insurance status in a broad population of patients undergoing complex surgical care. The researchers examined patient characteristics and use of high-volume hospitals across 10 hospital-based procedures with known volume-outcome...

Vaccine shown effective against chancroid

... been elusive in part because the virus constantly varies its surface molecules, making it an ever-changing target. But H. ducreyi, unlike other sexually transmitted bacteria, doesn't have such a protective mechanism. The current study and other studies suggest that developing a chancroid vaccine would be...

Gut microbes' partnership helps body extract energy from food, store it as fat

...o learn how much this cast of microbial characters varies in different human individuals. "We are superorganisms containing a mixture of not just human cells but also bacterial cells and cells of another microscopic domain of life known as Archaea," says senior author Jeffrey Gordon, M.D., the Dr. Robert J...

Smell of success for nanobiosensors

...uid (i.e. urine, blood, pus, etc) or in the breath varies in patients with the malignancy with respect to healthy individuals. Moreover, smell technology could, for example, be used to detect rotten food, test cosmetics and pharmaceuticals, identify pollutants or scan for drugs and bombs at airports, replac...

Failure of 'scout cells' may lead to cancer in transplant patients

...ansplant patients. The incidence of this cancer varies according to the organ transplanted, occurring in 1 to 2 percent of kidney transplant patients and in up to 20 percent of bone marrow and lung transplant patients. The disease usually arises within six months to a year after transplantation, and it c...

Gatekeeping: Penn researchers find new way to open ion channels in cell membranes

... excitable cells whose membrane voltage constantly varies in a precisely controlled manner. How the activity of channels in non-excitable cells is regulated has been a long-standing biological mystery. This new finding that SMase D can open ion channels without changing membrane voltage provides a clue to ...

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

...y California's Air Resources Board. Their toxicity varies with their chemical structure. Terpenes are a class of chemicals found in pine, lemon and orange oils that are used in many consumer products either as solvents or to provide a distinctive scent. Although terpenes themselves are not considered toxic...

Researchers add crucial information on how the body's T cells react to parasitic diseases

...esses more than a thousand ts genes, and this pool varies from parasite to parasite--making this set of proteins a poor choice for vaccine development, Tarleton said. The importance of the new research, however, isn't in specifically what happens in T. cruzi and Chagas Disease. Rather, it is a new unders...

How can identical twins be genetically different?

...re many other categories of genes where expression varies between twins. We are just beginning to understand how RA is able to affect people in different ways. The newly discovered genes provide important insights into the nature of the disease and facilitate the design of novel treatment strategies for RA,...

Taking evolution's temperature: Researchers pinpoint the energy it takes to make a species

...ges in a unicellular animal whose body temperature varies according to its surroundings, as opposed to a mammal, which regulates a constant body temperature, scientists could more precisely measure rates of speciation caused by the environment. In the end, it is individual metabolic rate - how fast an organ...

Secrets of the sea yield stronger artificial bone

...ess in ceramic materials, but nacre's architecture varies at several length scales, from micrometers to nanometers. Replicating all of these scales -- each of which contributes to the overall performance of nacre -- in a synthetic substance is extremely difficult. Then, the Berkeley Lab researchers thought ...

Landmark discovery of a Kaposi's sarcoma-associated herpesvirus receptor

...rs to study whether the expression of xCT on cells varies among different groups of people and whether these variations are genetic or environmental. This research may ultimately explain why certain groups are more at risk for Kaposi's sarcoma. "Our finding provides a new perspective on the disease," says...

All placebos not created alike

...results of this study show that the placebo effect varies by type of placebo used. "These findings suggest ...generalized phenomenon to one investigating how it varies in specific clinical environments. Kaptchuk and his colleagues have initiated other National Institu...

Confidence in memory performance helps older adults remember

...hip between control beliefs and memory performance varies for young, middle-aged, and older adults and whether using mnemonic strategies influences memory performance. "One's sense of control is both a precursor and a consequence of age-related losses in memory," says lead author Margie Lachman, professor...

Drug-resistant bacteria patterns in intensive care units changing nationally

.... "We know that the prevalence of community MRSA varies widely in local geographic areas, so it is important that doctors be aware of what is happening in their community," Dr. Klevens said. ...

Sociality of sweat bees evolved simultaneously during climate change

...th said. "In modern halictid bees, social behavior varies among species and even within species as a function of latitude and altitude such that species and populations at low latitudes and in warmer regions are often fully social, whereas they are solitary at higher latitudes and altitudes, which are colde...

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