Tag: "depleted" at biology news

$1.5 million awarded to marine conservationists

...g Ecuadorian fishermen to assess recovery rates of depleted species in the Galapagos. Rodney Fujita, Senior Scientist, Environmental Defense, California, USA Examining emerging trends affecting marine ecosystems and strategies to prevent problems. Stephen Hall, Professor of Marine Biology, Flinders Universit...

Princeton scientists describe genetics of blood stem cells

... from a sample of mature blood cells that had been depleted of stem cells. They then "subtracted" the two libraries, removing the majority of commonly expressed "housekeeping" genes while enriching for those that are preferentially expressed in the immature stem cells. By analyzing the DNA sequences in the "s...

Treatment protects mouse ovaries from radiation therapy

...n with a huge supply of immature egg cells that is depleted throughout their lives by a process called programmed cell death or apoptosis. Only a tiny fraction of the oocytes a female is born with actually mature and are released from the ovaries as eggs. It has long been known that treatment with chemother...

November GEOLOGY and GSA TODAY highlights

...osphorus, and many trace elements, and is the most depleted in some other trace elements such as chromium. The mineralogical characteristics of pyroxene in this meteorite imply that the parent rock cooled more slowly than other basaltic shergottites and thus may have been more deeply buried. Like other martia...

Household exposure to passive smoke depletes some vitamins in non-smokers

...um concentrations of the same carotenoids that are depleted by active smoking. Though the data were conclusive in demonstrating that the passive smokers were nutrient-depleted, further studies which additionally assess dietary intake of the subjects will be needed to determine whether depletion of antioxidan...

2000 FALL MEETING: updated press conferences, press registration, and other information

...to ozone formation. Surface ozone in the Arctic is depleted during sunlit periods, and it has been determined that a significant portion of this destruction may occur within the snowpack. Photochemistry within the snowpack can lead to creation of free radicals, a determinant of the atmosphere's "cleaning powe...

Changes in Australian ecosystems tied to arrival of exotic animals

...ragile ecosystem where the soils are significantly depleted in nutrients," said Miller. "I would speculate that even if all the exotic animals were removed, it would take the ecosystems a long time to recover because the soils lack resiliency."...

UCSF study of HIV patients identifies interleukin-7 as a key factor in controlling T-cells

... HIV disease, finding increased IL-7 in the T-cell depleted lymph nodes of people with advanced HIV, Napolitan...re identified. The study then compared lymph nodes depleted of T-cells with normal ones full of T-cells to determine if the T-cell depleted lymph nodes produce ...

Too much of a good thing

...n specific areas of the developing embryo in an RA depleted state. Dr. Hamada, Dr. Petkovich and colleagues have demonstrated that CPY26 acts to protect the developing mammalian embryo from the deleterious effects of excessive RA activity. The discovery that CPY26 functions to restrict the field of RA signal...

Excess iron stores more common than anemia in study of U.S. elderly

...96. In contrast to the relatively low incidence of depleted iron stores in the study population (3%), the prevalence of high iron stores was much greater (12.9%). To determine the effects of chronic disease conditions on the results, the researchers identified a subset of 182 subjects with indications of chro...

LSU researcher finds new petroleum method, receives patent

...wn and projected global petroleum deposits will be depleted within 100 years given current use rates. Although new sources of energy will be developed, there always will be a major need for petroleum hydrocarbons, including high-energy fuels and petrochemicals such as plastics, coatings and solvents. "My ap...

Scientist uses 19th century fishwheel' device to study fish populations

...ts indicate that striped bass which were severely depleted 20 years ago are at their highest numbers since scientists first started keeping records, thanks possibly to catch limits and other fishing regulations. "If we do this research over the next five to 10 years, we can tell how well those efforts are p...

Statins' beneficial effects on HDL

...consequence of apoA-I promoter activation in cells depleted of mevalonate. In the course of this work they have uncovered an unsuspected link between the transcription factor PPARa, which activates apoA-I expression, and the transcriptional response to statins. As the authors note, mevalonate is not only requ...

Officials delay trade restrictions on Caspian Sea caviar

...ress toward improved management and enforcement of depleted Caspian Sea sturgeon fisheries and places a temporary suspension on sturgeon catches through the end of 2001. However, CITES rejected the recommendations of scientists and conservation organizations to impose significant long-term reductions in cavi...

Using hard science to protect fragile seas

... of international commercial fish stocks have been depleted below the point where they will be able to produce large yields. In the United States, 80 percent of 191 commercial stocks are believed to be fully exploited or overfished, according to the NRC. Micheli has documented the dramatic consequence of ove...

Scientistis say 'business-as-usual' is not an option with global change

...mankind, and underground water resources are being depleted rapidly in many areas. Rivers take an average of 45 days longer to reach the ocean than they did 50 years ago and many currently dont even reach the sea for extended periods. Coastal and marine habitats are being dramatically altered; 50% of mangrov...

Marine methane consumed by consortia of bacteria

...o what the organism eats. If a bacteria eats food depleted in carbon 13, then the bacteria will be depleted in carbon 13. Methane is very depleted in carbon 13 so a carbon signature low in carbon 13 would in...

Researchers gain better understanding of deadly autoimmune heart ailment that affects young adults

...nake venom to deplete complement. None of the mice depleted of complement developed any signs of myocarditis, while four out of six control mice developed the disease. During the experiments, the researchers also determined that two cell receptors, CR-1 and CR-2, bind with complement to modulate T-cell acti...

Eaten as food, African orchids threatened by illegal trade

...eport says that up to 85 species are being rapidly depleted for use in chikanda or kinaka, a delicacy in which the root or tuber of terrestrial orchids is the key ingredient in a type of meatless sausage. Though the food has declined in popularity in Tanzania, it has become increasingly prevalent in neighbor...

Gene therapy technique reduces alcohol consumption in rats

.... Volkow and others showed that DRD2 receptors are depleted in human alcoholics. Whereas behavioral effects of this depletion are unclear, Drs. Thanos and Volkow hypothesize that DRD2 depletion produces a blunted pleasure response that leads alcoholics to increase their intake. The research team performed two...

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