Tag: "ultraviolet" at biology news

Sunlight converts common anti-bacterial agent to dioxin

... could occur in Mississippi River water exposed to ultraviolet light. "This form of dioxin is at least 150,000 t... and Arnold added triclosan to river water, shined ultraviolet light on the water, and found that between one percent and 12 percent of the triclosan was converted...

Microbes related to infant lung infections reduced using specialized ventilation system device

...e support can be reduced markedly by installing an ultraviolet germicidal irradiation device in the ventilation s..., called Vigilance', a computer-driven assembly of ultraviolet lights combined with other technologies, was developed by FP Technologies, Inc., in Buffalo. Res...

The seashell's inner beauty

...use researchers can easily add new components like ultraviolet light- or corrosion-resistant chemicals to the artificial nacre, the same manufacturing process can produce materials for a variety of applications....

Gene defect produces lupus-like disorder

...he resistance of the bacterium to irradiation with ultraviolet light. That finding suggested that the Ro/Y RNA co...lex plays a role in protecting against damage from ultraviolet radiation and could be compromised in lupus patients. Importantly, said Wolin, studies of the immune...

An eye for scent marks

Humans and most other mammals cannot see ultraviolet (UV) light, whereas some rodents can. A Chilean-Ge...rum extends from short-wave blue to long-wave red, ultraviolet (UV) is invisible to them. In contrast, many fish, reptiles and birds can see UV and use it in the i...

Chirping frogs keep UH scientists hopping

...cts, you can monitor what pesticides, pollution or ultraviolet light affect frog embryos."Before major questions can be answered, Wells said a major stumbling block must first be overcome. "To know the evolutionary and environmental answers, we need to understand early development, such as how the early embryo f...

Study finds direction of enzymes affects DNA repair

...e skin is extremely sensitive to the sun and other ultraviolet light, resulting in extreme freckling and aging. A key element of the report is the finding of a strong "down-regulation" of one of the repair enzymes, DNA polymerase (pol ) in the presence of the nucleosome. This means that nucleosome formatio...

The science of summer haircuts

...ir, receives more exposure to potentially damaging ultraviolet radiation during the summer months. Thicker hair m...ood job of blocking UV, Tobin notes. It will block ultraviolet rays from reaching the scalp skin as well, if not better, than sunscreen. Thus, hair that is kept ve...

Novel bacterium detoxifies chlorinated pollutants

...pounds formed from volcanic, biologic and possibly ultraviolet light processes. Other scientists assert that BAV1 occurred in the environment long ago, but only developed its chlorinated compound-based metabolism in response to PCE and TCE pollution. Georgia Tech researchers will continue to learn more about BAV...

City-grown air pollution is tougher on country trees

...one layer helps shield earthly life from the sun's ultraviolet radiation), excess ozone at ground level interferes with plants' metabolism. One sign of severe exposure to ozone is necrosis, or cell death, with brown spots marring plant leaves. But in some areas of metropolitan New York City, as well as in oth...

New target for skin cancer confirmed

...ed by five-times-a-week exposure to UVB light, the ultraviolet light that causes skin cancer. At 31 weeks of age,...the JNK2 enzyme could simply delay the response to ultraviolet light, but if so, it would be significant," Dong said. "If we age enough, every one of us will get c...

Battle lasers

...nerate 10 kW of infrared light and one kilowatt of ultraviolet light by late summer. The mid-June success followed a demonstration in 1999 of a one-kilowatt FEL with the capacity to generate 2,100 watts of infrared light. During the two and one-half years that this laser operated, it broke all records for tunab...

Protein is shown to aid cell's reading of genetic code

... molecules and fluoresce in different colors under ultraviolet light. With an optical microscope, the researchers could then see the location of Pol II and FACT on the DNA strand. By introducing the cross-linking at various times, they created a step-by-step record of the process. As predicted in the theory, th...

Detoxifying sediments with electrons and UV light

...ies of laboratory experiments, the team found that ultraviolet light also can substantially reduce the concentrat...sive to decontaminate. Further, electron beams and ultraviolet light effectively detoxified the banned chemicals known collectively as polychlorinated biphenyls, o...

How tea works against skin cancer

...n factors). The researchers shined UVB light, the ultraviolet light that causes skin cancer, on the shaven backs...at caffeine, a well-known component of tea, blocks ultraviolet light-induced carcinogenesis, said Dong. "Blocking UV light is the best prevention, but sometimes, p...

ITA to AMA: Taxing tanning sends wrong health message to teens

...dence that proves regular and moderate exposure to ultraviolet (UV) light has a profound positive effect on health. Instead of taxing teens who participate in an activity which has proven health benefits, we should be educating them about responsible UV exposure," said Dan Humiston, who serves as ITA president a...

New pollutant cleanup technique puzzles, pleases chemists

...nd found in life known as hemin. After exposure to ultraviolet light, the hemin and titanium dioxide can break up organohalides at surprisingly high rates. Obare and Meyer will present results of tests of the new approach at 6 p.m. on Sept. 8 in the North Pavillion of the Javits Convention Center in New York at ...

Envisat observes resurgent ozone hole

...heric ozone absorbs up to 98% of the Sun's harmful ultraviolet light. But human production of CFCs and other pollutants has led to thinning of this protective ozone layer. The discovery of this fact in the 1980s came as a shock. "Nobody expected such an outcome," said Eskes. "The very reason these classes of co...

NIH told regular and moderate exposure to sunlight is the key to preventing chronic disease

...d there. It is a question of determining how much ultraviolet light you need to maintain the right Vitamin D lev...ve exposures, not the limited sensible exposure to ultraviolet light or sunlight, that creates the concern about skin cancer. "The public health consequences of ig...

Scientists, physicians discuss latest discoveries for stopping cancer before it starts

...he odds of developing skin cancer from exposure to ultraviolet light; so do some non-steroidal anti-inflammatory drugs. Changes in the nucleus of some cells can serve as predictors of cancer susceptibility. More than 650 scientists and clinicians from around the world will gather in Phoenix next week to shar...

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