Tag: "ultraviolet" at biology news

CU Team Develops New Techniques For Repair Of Bone And Cartilage

...g joints. The process involves the use of ultraviolet light to create repeatingchains of complex molecules called polymers into putty-like, three-dimensional"scaffolds" that can be implanted into areas of bone or cartilage injury, saidAssistant Professor Kristi Anseth of chemical engineering. Although ...

University Of North Carolina At Chapel Hill Scientists Find Breast Cancer Gene Required To Correct Certain GeneticDamage

...insults- ionizing radiation, hydrogen peroxide and ultraviolet light -- known to injureDNA in different ways. The...ation and hydrogenperoxide-induced damage, but not ultraviolet light damage," Gowen said. "Thatmeans it is needed to repair oxidative DNA damage when this damage o...

Secrets Of The S.O.S Repair Service

...ged by various factors in the environment, such as ultraviolet radiation. This damage is normally corrected with the help of special proteins known as repair enzymes. Sometimes, however, these enzymes fail to do their job. Time to call the emergency repairmen. For more than 20 years, scientists have known that ...

UV Skin Damage In A Different Light

...term sun worshipers, and may also shed light onhow ultraviolet light causes skin cancer. "We studied a natural component of human skin exposed to ultraviolet light anduncovered a new chemical reaction that may contribute to aging [of the skin] andcancer," sa...

NASA Using Space Incubator To Understand Breast Cancer

...g radiation actually has two components, photons - ultraviolet light, X-rays, and gamma rays - and particles - naked atomic nuclei blasted out from supernovas. "Ionizing" means the radiation can energize atoms and molecules to break existing chemical bonds and form new ones. If it hits the right section of a a g...

USGS Issues Wildlife Health Alert: Associates Virus With Salamander Die-Offs

...ungi, bacteria or parasites; 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....

When Genes "Breed" In The Lab, A Suprising Number Of Their Offspring Are Supergenes

...rsions of proteins is random mutagenesis, in which ultraviolet light or aDNA-disrupting chemical makes genes mutate. But most of these mutations aredamaging, with typically only 1 per cent yielding genes that make improvedproteins. By comparison, 13 per cent of the enzymes Maxygen produced through DNAshuffling w...

UC Scientists Search For Alternatives For Methyl Bromide

...cant compared to that of methyl bromide because ultraviolet light in the atmosphere decomposes nearly all meth...verge of commercial development. The first uses ultraviolet laser technology to zap food-spoiling microorganisms. "The lasers disrupt the genetic material in...

Sunscreen Ingredient Causes DNA Damage In Light

...ry note: it may be safer toreplace it with another ultraviolet filter that does not attack DNA." Davies says his methods for testing PBSA -- which are outlined in the ChemicalResearch in Toxicology paper, co-authored with Queen's University colleagueClarke Stevenson could be used to evaluate other substances a...

Dyed In The Silkworm: Researchers Develop Novel Way To Produce Colored Silk

...aced with the new altered version.Remarkably, when ultraviolet light is shone on the silk glands of these invectedlarvae, the glands glow with an eerie green color! The development of thistechnique opens the door for genetic researchers to engineer silk proteins andreintroduce them into moths that can, in turn, ...

UV Radiation Induces Vitamin A Deficiency In Skin

...shed in thisweek's Nature Medicine. "We found that ultraviolet irradiation blocks the ability of skin cells torecognize and respond to an essential nutrient called retinoic acid, which skincells make from vitamin A or retinol," said John J. Voorhees, M.D., the Duncanand Ella Poth Distinguished Professor of Derma...

How Can You Tell Whether Corn Is Fungus-Ridden?

...nflakes or animal feed. Current tests use ultraviolet light, which makes certain species offungus glow in the dark. Grains that fluoresce bright green-yellow are thrownaway. The trouble is that this BGYF test, as it's known, misses around 15 percent of infected kernels. So chemists Sherald Gord...

Enzyme Required To Prolong Life In Worms Identified By Researchers At Columbia; Key Enzyme Appears To Protect Animal Cells From Oxidative Damage

...s in the cell and from reactions betweenoxygen and ultraviolet light, a component of sunlight. Anti-oxidants such asvitamin E are thought to provide some protection against these molecules. Some chemical reactions in cells produce hydrogen peroxide, but thosereactions are confined to subcellular compart...

New Way To Modify Mammalian Genes: Honolulu Transgenesis

...ction of aprotein that glows green under long-wave ultraviolet light, so the scientistscould easily see that the ...me if the mouse appeared green when illuminated by ultraviolet light. The 'green gene' is just a marker to indicate that the technique works, saysPerry. "We hope a...

UV Rays, Fire And Flame Retardants To Be Reviewed For Possible Listing As Carcinogens, NTP Announces

UVA, UVB and UVC, the three wavelength groups of ultraviolet light found insunlight and in varying amounts in artificial light from such devices as sunlamps and sun beds, will be reviewed for possible listing in the federalgovernment's Tenth Annual Report on Carcinogens, National Toxicology Programofficials sa...

The Sagan criteria for life revisited

... 2. place these ice grains in a vacuum; 3. shine ultraviolet light on them, the same type of radiation put out by nearby stars and re-radiated by glowing hydrogen gases. Because of the extreme conditions, the likelihood of more complex, biologically useful molecules being formed seemed as remote as space it...

USGS Study Confirms An Urban Air-Pollution Problem At Mount Rainier National Park

... the earth frombiologically harmful frequencies of ultraviolet radiation. The stratosphericozone layer is essential to the existence of many forms of life. However in the lower part of the atmosphere, called the troposphere,human-produced ozone can be a dangerous pollutant. The colorless gas is formed from byp...

Roundworm studies yield new insight into organ formation

...sion of the enzyme that lightsup when viewed under ultraviolet light. Then, using the modified enzyme, theytraced the protein's expression within the developing worm. "We found that the metalloprotease was expressed in leader cells (located atthe tip of the gonad), which made a lot of sense because they are par...

UT Southwestern researchers find lever involved in ultrviolet-ray sensitivity

...a significant role in sensitivity tocancer-causing ultraviolet light. UT Southwestern Medical Center at D...proteasome can cause yeast to be less resistant to ultraviolet light, which supports the idea that the proteasome is involved in repair." Next the research...

Reducing VOC: new polymer coating process combines high degree of flexibility with improved environmental properties

...d to a surface, the coating is cured using heat or ultraviolet light to rearrange the cyclic polymer to a linear and cross-linked structure. "The properties of these molecules can be changed by altering not only the backbone of the polymer, but also the side groups of the polymer," Eckert ...

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