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Tag: "population" at biology news

Bacteria that cause tooth decay able to survive without important biochemical pathway

...attack. When sugary foods are eaten, the S. mutans population explodes, excreting lactic acid as it digests sugar. The acid makes life difficult for other helpful bacteria and demineralizes tooth enamel, causing decay. According to the U.S. Centers for Disease Control and Prevention, 95 percent of adult Americ...

New study pinpoints epicenters of Earth's imminent extinctions

...legal protection, and most are surrounded by human population densities that are approximately three times the global average. Conserving these 595 sites should be an urgent global priority involving everyone from national governments to local communities, the study's authors state. The United States ranks amo...

New U. of Colorado at Boulder flu chip may help combat future epidemics, pandemics

...n a year and an estimated one-fifth of the world's population became infected. The flu chip also could be used to swiftly test for the avian flu virus at large, remote bird farms in Asia, Europe and Russia, said Kuchta. The chip also could be easily reconfigured to use for the global surveillance of any RNA v...

Pretreating rogue cancer cells with aspirin cripples their resistance to targeted therapy

...legal protection, and most are surrounded by human population densities that are approximately three times the global average. Conserving these 595 sites should be an urgent global priority involving everyone from national governments to local communities, the study's authors state. The United States ranks amo...

Performing monkeys in Asia carry viruses that could jump species to humans

...rimate Research Center. "There is a large, diverse population of primates there, and a huge human population in dense urban centers, so there's the potential for viral transmission across the species barrier."...

New study of the world's smallest elephant

...r Malaysian MSc student, Ms Nurzhafarina Othman in population biology and conservation genetics; and training for governmental and non-governmental organisations as well as representatives from the private sector on wildlife monitoring techniques." Project partners are the Sabah Wildlife Department, Kinabatang...

Carnegie Mellon U. transforms DNA microarrays with standard Internet communications tool

... can detect genes affected by such asynchrony in a population of cells. ...

Targeted drug delivery achieved with nanoparticle-aptamer bioconjugates

...tly affects Western populations although the black population has a significantly higher rate than the white population. The lowest incidence is seen in Asian populations.1There are just under 238,000 cases of prostate cancer in Europe each year and it is the cause of 85,000 deaths annually.2 Risk factors asso...

Researchers use 'trickery' to create immune response against melanoma

...tly affects Western populations although the black population has a significantly higher rate than the white population. The lowest incidence is seen in Asian populations.1There are just under 238,000 cases of prostate cancer in Europe each year and it is the cause of 85,000 deaths annually.2 Risk factors asso...

Tropical Atlantic cooling and African deforestation correlate to drought, report scientists

...y brought about environmental hardship, triggering population migration, giving rise to changes in the modes of agricultural production, and influencing the fall or rise of civilizations." Weldeab points out that the past 50 years are marked by deforestation and overgrazing much greater than that of the past, ...

Birth defects: 8 million annually worldwide

...orld's "malaria belt," a greater proportion of the population carries one copy of a gene for an inherited disease that confers some protection against malaria -- specifically, sickle cell, thalassemia, and glucose-6-phosphate dehydrogenase deficiency (G6PD). When two carriers of these diseases have offspring, ...

Frog’s ear canal may provide insights for understanding human hearing loss

...asonic range -- both in the averaged response of a population of nerve cells in the brain and in single nerve cells -- confirming the frog's capacity for hearing ultrasounds. (A different species that lives in similar environments also demonstrated an ability to hear ultrasounds.) The next steps for the resear...

HIV/AIDS rates in Tijuana, Mexico increasing at alarming rate

...o a concentrated epidemic when more than 1% of the population is infected ?a figure that Tijuana may soon approa...e Prevention and Control of HIV, extrapolated with population estimates based on the 2000 Mexican census. The dramatic rise in HIV infection may be linked to a n...

Wisconsin scientists discover a master key to microbes' pathogenic lifestyles

...a capsulatum, infects as much as 80 percent of the population where the organism is endemic, including much of the eastern and central United States. It is also widespread in South America and Africa. In most instances, the infection prompts only mild symptoms. Untreated, however, it can be fatal. What's more, ...

Living taste cells produced outside the body

...it is replaced. The new taste cells develop from a population of undifferentiated precursors known as basal cells. Understanding of the process of taste cell differentiation, growth and turnover has been hampered by the inability of researchers to keep taste cells alive outside the body in controlled laborato...

New discovery: Molecular variation in one gene affects the growth of natural populations

...r variation in one gene may affect the growth of a population in its natural habitat. Research Professor Ilkka H..., University of Liverpool, UK, discovered that the population growth of the Glanville fritillary butterfly (Melitaea cinxia) is affected by the allelic compositio...

Researchers map of genetic variations implicated in disease

...rences were then further analysed in a much larger population of 140 DNA samples. "Within the sea of over 20,0... been successful in the past), or it may reflect a population bottleneck, where only a few, perhaps similar, genomes have contributed to the further population gr...

Computers to save unique type of American red squirrel

... In the US, the new computer model, which mimics population dynamics in response to different threats, will he... of predation and the Abert's squirrel on squirrel population but are to expand on this: "The model will help identify areas where we need more research, will inf...

Pitt professor's theory of evolution gets boost from cell research

... a recessive state, spreading silently through the population until offspring appear with two copies of the new mutation and change suddenly, seemingly appearing out of thin air. Those changes may be significant and beneficial (like teeth or limbs) or, more likely, kill the organism. Why does it take an enviro...

Learning to love bacteria: Stanford scientist highlights bugs' benefits

...cers or cancer. At least 80 percent of the world's population is infected with H. pylori yet has no overt symptoms. What makes the study of H. pylori even more perplexing is that as such advances as clean water and pasteurization are adopted, the prevalence of H. pylori infection has declined. On the one hand,...

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