Tag: "population" at biology news
Climate change isolates Rocky Mountain butterflies
...ng depression will increase as meadows shrink, the population
sizes decrease and the populations become more iso...ng habitats; but, ultimately, we need to study the population
dynamics to find out if the habitat allows the species to reproduce and persist," Roland said. "Th...
Pollution causes 40 percent of deaths worldwide, study finds
...m more than 120 published papers on the effects of population
growth, malnutrition and various kinds of environm...ncidence of diseases," said Pimentel. Of the world population
of about 6.5 billion, 57 percent is malnourished, compared with 20 percent of a world population
Which came first, the moth or the cactus?
...tic interactions leads to predictions of unbounded population
growth or instability and eventual doom due to one... mutualist may exert some control over the other's population
increases, such that neither unbounded growth nor overexploitation ensue. "I have always been inte...
Newly created cancer stem cells could aid breast cancer research
...ri dish by isolating and transforming a particular population
of cells from human breast tissue. After being injected with just 100 of these transformed cells, mice developed tumors that metastasized (spread to distant tissues). The operational definition of a cancer stem cell is the ability to initiate a tum...
Scientists show that mitochondrial DNA variants are linked to risk factors for type 2 diabetes
...to the Centers for Disease Control, 7% of the U.S. population
has diabetes, and 90-95% of those cases are classified as type 2 diabetes. Type 2 diabetes is caused by external factors such as diet and exercise, and is influenced by several genes. While most of the genes known to be involved in diabetes suscept...
Genetic variation helps to understand predisposition to schizophrenia
...nce. Scientists originally found in an Icelandic population
that genetic variations in a DNA sequence close to a gene that produces a protein called Neuregulin 1 were associated with schizophrenia, but how the Neuregulin 1 gene was affected remained unknown. In 2006, Law and colleagues found that one of th...
Conventional plowing is 'skinning our agricultural fields'
...thods and the need to feed a rapidly growing world population
are combining to deplete the Earth's soil supply, ...ch enough soil to sustain them. But with the world population
now exceeding 6.6 billion people, Montgomery argues that there are few, if any, places left where th...
Study finds gender differences in renal and other genes contributing to blood pressure
...lood pressure) measured in a large community-based population
with the strategy of assessing genetic variants of genes involved in two major blood pressure regulation pathways to identify gender differences in genetic contribution to blood pressure. The results reinforce previous observations of the role of ge...
Satellite tracking reveals threats to Borneo pygmy elephants
...e too small and too fragmented to support a viable population
for the long term, according to the report. Five pygmy elephants were darted and outfitted with collars two years ago by the Sabah Wildlife Department with WWF assistance, after tracking the elephants on foot through the dense jungle was found too ...
Edible fish feasts beats malaria
...ly to be a noticeable effect on the adult mosquito population
in the area," Howard says. This control method is apparently sustainable, as the fish breed and provide a continuous population. The authors also point out other benefits in their article. There are over 2000 pediatric malaria cases annually in the...
Testosterone replacement therapy: How safe for aging men?
...e that mimic the characteristics of the human male population
that currently receive testosterone supplements. They are currently testing the hypotheses that the natural decrease in testosterone brought on by aging may affect the progression of pre-existing cardiovascular/renal disease....
Research aims to identify markers for menopausal women at risk for deadly blood clot
.... They are applying the earlier results to a human population
for the first time using blood taken from the women enrolled in the KEEPS trial. Depending upon the results from this group, a larger trial of 720 samples will be examined. Depending on the results of this study, the researchers may examine the re...
Innovative tagging technique may help researchers better protect fish stocks
...es more than $480,000 for three years to study the population
dynamics of grouper and snapper in the waters around the Great Barrier Reef and Papua New Guinea. Through a new technique known as TRAnsgenerational Isotope Labeling (TRAIL), the researchers will introduce an artificial taga stable isotope of bariu...
New technology reveals seal behavior
...dded, This approach helps us to understand current population
trends, where the animals forage and predict the availability of food under various climate change scenarios. Dr. Mike Meredith, Head of the Atmosphere and Ocean Group at British Antarctic Survey says, The Southern Ocean is the hardest place in the...
Other highlights in the Aug. 7 JNCI
...ld effect the liver cancer death rate in a Chinese population
that was deficient in many vitamins and minerals. Study participants took two or four of the following combinations: retinol and zinc; riboflavin and niacin; ascorbic acid and molybdenum; beta-carotene, alpha-tocopherol, and selenium; or placebo pill...
Taking a supplement of glycine helps prevent degenerative diseases such as arthrosis or osteoporosis
...ulary problem in our society: more than 50% of the population
suffer from it after the age of 65, and 80% of people over 75. It consists of a degeneration of the articulary cartilage which disappears until it leaves the subchondral bone exposed. Arthrosis has no cure at present and the most widely used treatmen...
Story tips from the US Department of Energy's Oak Ridge National Laboratory, August 2007
... at Oak Ridge National Laboratory are conducting a population
viability analysis, which will provide a scientifi...populations are thought to be viable. The Ogeechee population
has fewer than 500 fish. Jager is working in cooperation with field efforts conducted by Fort Stewar...
Biologist traces coconut's history through DNA
...on; the impact of human activities in homogenizing population
structure across the species range; and the possible geographical location of the undomesticated wild progenitor populations....
Genetic analysis finds greater threat in frog-killing fungus
...ld guess that the frogs living where the ancestral population
of this fungus is located would not be affected that badly. We could then try to determine the mechanisms those frogs use to resist the pathogen." The study also found that the sites near Tioga Pass Road contained two similar populations of fungi. ...
Census of Marine Life historians detail collapse of bluefin tuna population off northern Europe
... The chronicle of decimation of the bluefin tuna population
in the North Atlantic is being published as other ... booming catches helped strip the Atlantic bluefin population
in a relative blink of time 1910 to 1950. The species virtually disappeared from the region in the...
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