Tag: "ultraviolet" at biology news

Researchers suggest new mechanism to explain DNA charge transfer process

... segment. He then irradiated the anthraquinone wth ultraviolet light, causing it to inject a radical cation (a positively-charged ion) into the duplex chain of DNA base pairs. He measured the progress of thecation through the DNA by observing where it damaged the strand at GG steps. The structural-independence...

DNA: A sloppier copier

...e decadesstanding by definitively establishing how ultraviolet radiation causes geneticmutation in a common bacte...eplication in Escherichia coli bacteria exposed to ultraviolet light.The team has established that the complex is a DNA polymerase, the fifth DNAreplicating enzyme...

Atmospheric carbon monoxide levels decreasing in mid-Atlantic region

...ows monitoring station observesweather conditions, ultraviolet light penetration, ozone, sulfur dioxide, andreactive nitrogen compounds in the air. The researchers attribute the decrease in carbon monoxide largely to reductionsin manmade emissions, consistent with trends in emissions reported by the U.S.Environm...

USGS issues wildlife health alert: Chytrid fungus infection

...rldwide declines, including increased exposure to ultraviolet radiation due to ozone thinning, the spread of non-native predators, contamination from pesticides and other chemicals, and rising temperatures. Many biologists suspect that a combination of factors may be responsible....

Scientists identify novel component of cell-fate pathway

...rsdestroyed dorsal structures in frog embryos with ultraviolet irradiation, theycould "rescue" them by injecting CKI. In the worm Caenorhabditis elegans, Graffand collaborators showed that blocking CKI disrupted Wnt signaling by producingthe same type of abnormal worm that results from blocking previously known ...

Advance may put gene chip technology on scientists' desktops

...n photolithography, a process that requiresshining ultraviolet light through a series of stencil-like masks onto a glasschip resulting in the synthesis of tens of thousands of DNA molecules ofinterest. Each DNA molecule synthesized on such a chip, said Sussman, is like awindow to a wealth of genetic information,...

Reports from special environmental health issue explore links to autoimmune diseases - diabetes, lupus, multiple scleroris and arthritis

...te to type 1 diabetes.Other possible links include ultraviolet radiation and multiple sclerosis,ionizing radiation and systemic lupus erythematosus, stress and rheumatoidarthritis, and exposure to heavy metals and autoimmune glomerulonephritis. Reporters and editors may obtain free electronic access to ...

Scientists look for signs of pollution in the superhighway in the sky

...own from the stratosphere where it acts as Earth's ultraviolet shield. And nitrogenoxides in large amounts can be produced on the spot by lightning strikes. So itbecomes very difficult to unequivocally pin down where the nitrogen oxides andozone are coming from. Another critical ingredient complicating t...

Abgenix reports positive clinical data with ABX-IL8 in Psoriasis

...uire systemic therapy with immune suppressants and ultraviolet phototherapy. The risk of serious adverse side effects associated with these therapies often requires the patients to alternate between various therapeutic modalities as a precautionary measure. Abgenix is a biopharmaceutical company that develops...

Waste not

...or, hollow fiber ultrafiltration membranes, and an ultraviolet disinfection system. It isdesigned to treat the non-oily wastewater from a crew of 75 and produces 2.3 gallons per minute ofeffluent. If implemented, AMTS will eliminate costs associated with discharging non-oily wastewater toport handling facilitie...

Meet Conan the Bacterium

... That's why crawling under a rock to escape solar ultraviolet light on Mars is not a perfect strategy. The rock itself emits trace quantities of radiation over time. "Within responsible imagination, no long-dormant lifeform can be expected on the surface of Mars due to combined build up of damage over time cau...

Cooperative action of two proteins causes damaged cells to "self-destruct"

...ery organism due to environmental factors, such as ultraviolet radiation and chemical toxins, aswell as natural cell processes. If left unchecked, the damaged cells will continue to proliferate,often leading to life-threatening diseases, such as cancer. This "emergency" suicide pathway is designed to reverse or...

20th century marks achievements in food science and technology

...serve food. Vitamin D first added to milk through ultraviolet radiation (1933). 1940s: Mass production of food using automation takes off. Concentrated, frozen, and dehydrated foods, such as frozen concentrated citrus juices, produced in mass quantities for shipping overseas to the military. Flour first forti...

Exposures to second-hand smoke lower than believed, ORNL study finds

...hours. Samples from the subjects were analyzed for ultraviolet absorbing and fluorescing particulate matter, solanesol, 3-ethenyl pyridine, nicotine and RSP. Other constituents of environmental tobacco smoke, sometimes called second-hand smoke, also were not present in the levels previously thought, Jenkins said...

Plankton are not affected by ozone depletion

... Californian researchers are right, then increased ultraviolet radiation is having scarcely any effect on the gro... hole, cloud cover, and UV-B strength, the type of ultraviolet radiation that increases as atmospheric ozone declines. To find out what increased UV-B did to phy...

Carotenes and vitamin E protect against sun damage to the skin

... U.S.A. since 1973, protection of the skin against ultraviolet radiation damage has become a priority health issue. Beta -carotene (a precursor of vitamin A) has been widely used as an oral sun protectant with few studies into its effectiveness; however, new research by Stahl et al. in The American Journal of C...

Asteroid devastation possibly worse than feared

...pletion, acid rain and increased levels of harmful ultraviolet radiation. The results were just published in the ...ons, which would allow much greater penetration of ultraviolet light. At first, of course, the ultraviolet rays would be blocked by the dust cloud, which sets the ...

New USGS research shows how land use affects amphibians

...ticides and other chemicals, increased exposure to ultraviolet radiation due to ozone thinning, and the spread of non-native predators. Many biologists suspect that a combination of factors may be responsible. These die-offs are of great concern because amphibians are good barometers of significant environmental...

X-ray studies shed light on frog deformities

...d of immature parasitic worm; exposure to the suns ultraviolet rays; and physical trauma. Based on the x-ray data presented in the Teratology study, Meteyer and her colleagues feel that none of the current hypotheses adequately address the full range of malformations. "The detailed descriptions and classific...

Gene defects tied to inability of cells to repair DNA damage

...environmental pollutants, or exposure to the sun's ultraviolet (UV) radiation. From numerous studies, free radicals are known to interact readily with nearby molecules to cause cellular damage, including damage to genetic material. Damage repair to an active gene, one that continually produces proteins crucial t...

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