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Tag: "population" at biology news

International HapMap consortium expands mapping effort

...donors. However, the samples are identified by the population from which they were collected. Although any two people are 99.9 percent identical at the genetic level, understanding the one-tenth of one percent difference is important because it helps explain why one person may be more susceptible to a certain ...

Unprecedented water level rise in Somalia

...ridge limits the accessibility and mobility of the population around the city, affecting daily activities such as commuting to work, school and accessing hospitals and markets. The floods affected at least 170 households. ...

Multiple Campylobacter Genomes Sequenced

... cases going unreported, up to 0.5% of the general population may unknowingly harbor Campylobacter in their gut annually. Diarrhea, cramps, abdominal pain, and fever develop within 2? days of picking up a pathogenic Campylobacter species, and in most people, the illness lasts for 7?0 days. But the infection can...

How the environment could be damaging men's reproductive health

... be the mechanism involved. "We need a much larger population in order to investigate the implications of these changes on sex ratio of offspring as the number of children born to these fishermen was small. "However, we think the fact that exposure to environmentally derived chemicals can change the sex chromo...

Programmable cells: Engineer turns bacteria into living computers

...he new paper applies similar techniques to a large population of cells. "Here we're showing an integrated package where the cells have an ability to send messages and other cells have the ability to act on these messages," said Weiss. The creation of patterns, such as the bull's-eye effect, is a key step in o...

Antiretroviral therapy may prevent excess risk of some cancers in people with HIV

... times more frequently than they do in the general population without HIV/AIDS. HAART use was not associated with lower risks of Hodgkin lymphoma or other cancers. Although people infected with HIV had increased risks of cancers of the lung, lip, mouth, and pharynx, no cases of these cancers were found among no...

Molecular models advance the fight against malaria

...ll. According to WHO estimates, 40% of the world's population are currently at risk of the disease and approximately 2 million people, mostly children, are killed by malaria annually worldwide. Today marks Africa Malaria Day, organized to promote awareness of the disease in a country where a child is killed eve...

Stem Cell Research Shows Potential for Replacing Tissue Damaged in Heart Attacks

... similarly induce ES cells to become a homogeneous population of cardiac myocytes. Working with Diane Rudy-Reil...ardiac embryoids.?Each cardiac embryoid contains a population of beating cardiac myocytes that is nearly homogeneous. “The results are significant because we wer...

Single stem cells from bone heal a broken heart

...e first demonstration of a single, human stem cell population derived from the bone marrow that has the capacity to induce generation of new heart cells and formation of new blood vessels ?two key components of successful myocardial repair. The results provide a foundation on which new approaches to repair the ...

HIV-1 spread through six transmission lines in the UK

... chain was 445, approximately 2.5% of the infected population at the time. This trend is remarkably similar to the values for the US epidemic, where the number of transmitted infections and prevalence in 1995 reached 5000 and 200,000 infections respectively. The most recent transmission chain identified by the...

New lab technique identifies high levels of pathogens in therapy pool

...ate University, the new study assessed the microbe population in a warm hospital therapy pool through a ribosomal RNA analysis that involved cloning and sequencing genes. The team concluded that the microbes, many of them pathogenic, were enriched just inches above the pool's surface by as much as 60 percent. ...

Brain-mapping technique aids understanding of sleep, wakefulness

...ce to produce a "tracer" protein only in a certain population of neurons. The tracer, a nontoxic fragment of the tetanus toxin, transfers itself from one neuron in retrograde fashion to neurons "upstream" -- those from which the tracer-producing neuron receives signals. Researchers then track the tracer to map ...

Super predators and mass extinctions

... whose numbers fluctuate only slightly as the prey population waxes and wanes. Inevitably, their stable community is disrupted when mutations lead to a super predator that quickly decimates the prey population, which in turn leads to its own demise. The few creatures that survive the predatory apocalypse gradua...

Genetically Modified Natural Killer Immune Cells Attack, Kill Leukemia Cells

...tory technique for rapidly producing a large, pure population of NK cells from a small sample of blood; and deve...ls quickly stimulated the expansion of the NK cell population to more than10,000 times their original number. The technique triggered growth of NK cells specifica...

Same-Sex Mating Discovered in a Toxic Fungus

...maintained in an organism with a largely unisexual population structure?" Heitman asked. "The fruiting of alpha strains provided a clue." In their laboratory experiments, the researchers found that, rather than being an asexual process, the hallmarks of mating occur during fruiting of alpha isolates. Unisexual...

Potential Drug Target For Treating Cocaine Abuse Found

...eople in the United States ?about 1 percent of the population - use cocaine, according to estimates. Of this number, more than 550,000 are crack users. In 2002, 1.5 million Americans were thought to be dependent on or abusing cocaine. "Cocaine is capable of destroying not only the lives of those addicted, but a...

Used in a new way, RNA interference permanently silences key breast cancer gene

...f genetic material are become inactive as the cell population continues to expand. "We are a long way from using this technique in patients, but this study shows that that it may be possible to use RNAi in more than just experiments that silence genes temporarily," says the study's principal investigator, Ralp...

Brain Scans Reveal How Gene May Boost Schizophrenia Risk

...inations and delusions, affects one percent of the population and is treated with antipsychotic drugs that block dopamine. The prefrontal cortex is critical for motivation, learning in response to reward, and working memory ?functions impaired in schizophrenia, which is thought to involve a dopamine imbalance. ...

First technology to remove prions that cause vCJD from blood launched

...the disease for many years, a proportion of the UK population could be incubating vCJD and acting as blood donor...uate supply of blood for transfusion. As the donor population becomes even more limited with each additional residency deferral, it further reduces the potential ...

Maine Researchers Find Exceptions to Old Rules of Genetic Inheritance

...aboratory. In feral house mice, 20 percent of the population carries one copy of the t haplotype whereas the remaining 80 percent carries the wild haplotype. According to the distribution predictions set out by Gregor Mendel, the 19th century Austrian monk who studied inheritance in flowering pea plants, males...

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