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Tag: "population" at biology news

Are rice and wheat behind China's population boom?

...heat, helps explain the foundation of China's huge population today." ...

Habitat use by North Pacific right whales, Eubalaena japonica, in the Bering Sea and Gulf of Alaska

The small population of North Pacific right whales, found during the su...arameters critical to the survival of this remnant population of right whales, habitat use was investigated by scientists at the NOAA National Marine Fisheries Se...

New World founders small in number

...he New World was colonized by a surprisingly small population with an effective size of only about 70 individual...y's approach addresses shortcomings in traditional population genetic studies that rely on just one gene and that assume that population sizes have been constant ...

The biggest family tree ever

...earn about their genetic ancestry," said Hammer, a population geneticist. One of his specialties is deciphering prehistoric human relationships using genetics. By comparing the genetic markers, the UA scientists' work will unveil new aspects of people's family trees, ones that are almost impossible to discover...

Changing ecosystems throw scientists mega-challenges

...ssibility of water," it says. With continued human population growth and the uncertain impacts of of environmental change, the report states, ensuring an adequate quantity and quality of freshwater for sustaining all forms of like is a growing challenge. " Integrated, multidisciplinary, and multi-scale, water-r...

Stanford gut check shows diversity of intestinal ecosystem

...wing statistical techniques from field ecology and population genetics, Paul Eckburg, MD, a postdoctoral scholar in infectious diseases and geographic medicine, conducted the most extensive study to date surveying the inhabitants of the lower digestive tract. In the three healthy subjects he studied, he found 3...

Low oxygen likely made Great Dying worse, greatly delayed recovery

...animals to cross from one valley to the next. That population fragmentation likely increased the extinction rate and slowed recovery following the mass extinction, Huey said. "Biologists have previously thought about the physiological consequences of low oxygen levels during the late Permian period, but not ab...

Scientists reveal the shape of a protein that helps retroviruses break into cells

...animals to cross from one valley to the next. That population fragmentation likely increased the extinction rate and slowed recovery following the mass extinction, Huey said. "Biologists have previously thought about the physiological consequences of low oxygen levels during the late Permian period, but not ab...

Stem cell research - new cell lines

...chers are one step closer to deriving a homogenous population of cells of a particular type. "There are about 2...blem. It gives the hope that we can produce a pure population of those cells in large numbers and transplant them into the patient." The researchers are currentl...

A New Species of Monkey is Discovered in Tanzania: The First in Africa for More Than 20 Years

...and critically endangered, with an estimated total population of between 500 and 1,000 animals. Also noted by D...s in good condition, but there is concern that the population of the highland mangabey in this forest is very small and limited in distribution. Ehardt observes t...

AIDS Public Awareness Campaign Expands Following Report Of Rapidly Progressive HIV

...o better monitor HIV drug-resistant strains in the population and further strengthening access to HIV counseling and testing. Earlier this month, the New York City Department of Health and Mental Hygiene reported a highly resistant strain of rapidly progressive HIV diagnosed in a New York City resident. The pa...

Retrovirus struck ancestors of chimpanzees and gorillas millions of years ago, but did not affect ancestral humans

...ulations. If the virus had killed off much of the population of both species, it may have created what evolutionary biologists call a population bottleneck. This much smaller group of surviving animals would then sort out most of its genetic var...

Cousin of Asian super termite invades Florida

... UF researchers have discovered a well-established population in Riviera Beach, more than 70 miles north of Miam...olting, thereby reducing the ability of the worker population to sustain underground colonies. The chemical has a low toxicity to humans and the environment. Less...

Prescription Drug Patches Gaining Ground, Tackling New Therapies

...veral factors ?factors with strong demographic and population trend underpinnings. Technology has also played a major role in prescription patch growth. Advances in synthetic materials and patch design have led to patches that are more esthetically acceptable and that are capable of delivering sustained dosing ...

Butterfly migration could be largest known

... of plants for the caterpillars to eat, fuelling a population boom, Shapiro said. The butterflies take about three days to reach the Central Valley, and the current generation will fly as far as southern Oregon. Their offspring will fly on to reach British Columbia by summer, before heading south again in the ...

Bee mites suppress bee immunity, open door for viruses and bacteria

...probably arose in the Eastern or Chinese Honey Bee population and hopped over to the United States in 1987. They quickly infested western or European honey bees. One sign of infection is the presence of bees with deformed wings. Also, sometimes seemingly healthy colonies become ill and the complete hive collaps...

Chimp genome reveals a retroviral invasion

...tter understanding of the evolutionary history and population genetics of great apes will help identify the most likely scenarios. And knowing how these retroviral elements infiltrated some apes while sparing others could provide valuable insights into the process of evolution itself. Citation: (2005) The Chim...

Single-donor Islet Transplantation Procedure Shows Promise For Patients With Type 1 Diabetes

...n islet transplantation, further study in a larger population with longer follow-up will be critical to assess the risk-benefit ratio of this emerging therapeutic option," the researchers conclude. ...

A hope for oil spill bioremediation

...as to assess the response of the natural bacterial population after the spill and to detect evidences of crude o... the Prestige crude oil, pointing out to a natural population oxidizing this carbon source into CO2. This could be reproduced in the laboratory using water sample...

Mutation in clams protects against paralytic shellfish poisoning but raises human health risk

... function differently, with those from exposed the population showing markedly less sensitivity to the toxins. Tracking these differences down to the genomic level and comparing DNA sequences from the two populations enabled Connell to identify the single nucleotide mutation that corresponded with toxin resist...

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