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Tag: "depend" at biology news

Scientists collaborate to assess health of global environment

...at the environmental benefits that human societies depend on and take for granted--basic necessities such as...e the most from environmental change, because they depend heavily on ecosystem services. In some places, such as sub-Saharan Africa, environmental change is t...

Estrogen-like Component of Plastic Stimulates Growth of Certain Prostate Cancer Cells

...ate cancer this year.Many cases of prostate cancer depend on androgens like testosterone fortumor growth and cancer cell proliferation, said Dr. Knudsen, thestudy’s senior author. A common treatment for prostate cancer includeslimiting testosterone synthesis. Patients with mutated androgenreceptors may not ...

Beyond lithium for bipolar disorder

.... However, better treatments for bipolar disorder depend on a better understanding of the still-mysterious mechanism by which lithium damps the highs and lows of the disorder. Now, researchers led by Philip Brandish of Merck & Co., Inc., and Edward Scolnick of the Broad Institute (formerly of Merck and...

Scientists discover that host cell lipids facilitate bacterial movement

...s that inhibited PI3-kinase, proving that Listeria depend on PI3-kinase to move. "Our studies show that Listeria is capable of inside-out signaling," explains Dr. Southwick. "Most signals arise from molecules binding receptors on the outside of the cell. In the case of Listeria, we find that this intracell...

Love at first smell

...owever, it seems that our choice of perfume should depend on our MHC genes. Perhaps these results explain why some perfumes smell good on some people and terrible on others." Professor Thomas Boehm, Max-Plank Society said: "The new results raise the question of whether humans can also gather information ab...

A new study examines how shared pathogens affect host populations

...s, and their transmission rate is often thought to depend on the proportion of hosts or vectors infected (i.e. frequency dependence). A study, to appear in the July 2005 issue of The American Naturalist, by Volker H. W. Rudolf and Janis Antonovics provides an important conceptual counterexample to the idea ...

Variation in women's X chromosomes may explain differences among individuals, between sexes

...on of particular portions of the X chromosome will depend on the number of active genes normally contained within that segment, he explained. The findings also highlight key differences between female and male genomes, according to the researchers. For one thing, women are known to consist of a mosaic of ...

Substance protects resilient staph bacteria

...ell-surface structures. Biofilm formation does not depend on PGA, but other research in Dr. Otto's laboratory has indicated that PGA production is greater when a biofilm is present. Further, Dr. Otto says all 74 strains of S. epidermidis that his group tested also produced PGA, as did six other genetically ...

Iron exporter revealed that may explain common human disorder

... cells remained indirect. To determine which cells depend on ferroportin, the researchers inactivated the protein in mice, both globally and in select tissues. Animals completely lacking ferroportin died early in development due to a failure of iron transfer from mother to embryo. Mice deficient for ferrop...

Solutions that reduce death of marine life reeled in by International Smart Gear Competition

...wl fishermen in India and other tropical fisheries depend on both finfish catches and shrimp catches to keep their commercial operations viable, but bycatch of juvenile fish and shrimp are of low commercial value and threaten future populations and catches. According to the U.N. Food and Agriculture Organiz...

Protein That Promotes Survival Of Stem Cells Might Be Key To Poor Leukemia Prognosis

...ood cells and platelets has now been discovered to depend in large part on a single protein called Mcl-1. This finding, from an investigator at St. Jude Children's Research Hospital, is published in the February 18 issue of Science. Mcl-1 blocks the biochemical cascade of reactions that trigger apoptosis (...

New Estimates For The Causes Of Child Deaths Worldwide

...ld mortality by two-thirds from the 1990 rate will depend on renewed efforts to prevent and control pneumonia, diarrhoea, and undernutrition in all WHO regions, and malaria in the Africa region. In all regions, deaths in the neonatal period, primarily due to preterm delivery, sepsis or pneumonia, and birth ...

Potential Drug Target For Treating Cocaine Abuse Found

...s-porters and the substances that bind to them may depend on the chemical structure of those substances," says NIDA's Amy Newman, who synthesized the compound. The researchers found that their novel drug made contact with transporters slowly ?about 10 times slower than cocaine ?which, they speculate, may be...

Study reveals dramatic difference between breast cancers in US and Africa

...percent of African tumors did. These tumors do not depend on estrogen and thus will not respond to drugs, such as tamoxifen, that prevent estrogen from reaching the cancer cells. -- Third, cancers from African women were slightly less likely to express the cell-surface marker HER2. HER2 is the target for t...

Study uncovers bacteria's worst enemy

...n from nuclear waste and processing activities may depend more upon how resistant the bacteria are to chemicals than to how tolerant they are to radioactivity. The results of a recent Laboratory study may help make bacterial bioremediation a more widespread method for cleaning up sites contaminated with act...

Man-made wetland's effectiveness similar to natural marsh

...en to the detriment of fish and other animals that depend on waterways for survival. Algae essentially rob oxygen from water in a pond, lake and even the ocean. "We saw a pretty significant reduction in phosphorus and nitrate concentrations ?close to the kind of decrease we typically see in a natural wetla...

The biggest family tree ever

...,000 samples each month. The actual work load will depend on how many people join in the multi-national effort. "For the first time people all around the world can learn about their genetic ancestry," said Hammer, a population geneticist. One of his specialties is deciphering prehistoric human relationship...

Brain May Be Less Plastic Than Hoped

...s added. “Reorganization in these areas might then depend more on the modification of existing patterns of connectivity, be it subcortical, feedback, or other broad area-to-area connections. Of course, that is highly speculative. It is also conceivable—although in our opinion less likely—that in neocortical...

Scientists find viruses can't stick to sea bugs in the dark

...ng in Scotland, which shows that these cyanophages depend on light to stick to their victims, and cannot function in the dark. "Understanding the function of light as one of the most important environmental factors of the phage-cyanobacteria interaction is vital," says Ying Jia. Cyanophages may be an impor...

Amazon symposium to address large-scale conservation

...nservation of the greater Amazon Basin region will depend upon (1) conservation analyses that describe the complex interactions among ecosystems, economies, and climate that will unfold into the future, (2) regional conservation planning processes that diminish the environmental destruction of frontier expa...

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