Tag: "sunlight" at biology news

Heat-loving Microbe Repairs Its DNA With Light

...ctrum to reverse the harmful effects ofthe UV that sunlight also contains. On the other hand, Grogansays it seems ironic that the first example of DNA repair to beobserved in S. acidocaldarius works on UV-induced DNA damage, andnot the damage expected to be caused by extremely hightemperatures. Grogan's res...

Mutate Or Die: New Polymerase Gives Desperate Yeast An Option

..., done bycreating in yeast the type of damage that sunlight does to our own DNA, is reported in the June 14 is...a very common and well studied lesion created when sunlight hits an organism, causing two bases to link up unnaturally.The abnormality almost always stops other...

Cornell Researchers Precisely Date Wood From Ancient Tomb In Turkey

...: it spurred massive growth. Reduced exposure to sunlight and increased soil moisture led to tree rings in juniper, cedar and pine samples from Porsuk, a site in central Turkey, that were three to eight times wider than normal. Porsuk is about 840 kilometers downwind of Thera. Archaelogists had long believ...

Photosystem I -- An Intermediate Step -- May Not Be Necessary For Plants

... which cells in green plants convert the energy of sunlight into chemical energy and use carbon dioxide to produce sugars -- needs two intermediate light-dependent reactions for successful energy conversion: Photosystem II and Photosystem I. But according to a new study reported today (July 19), that dogma m...

Duke Ecologist Says Logging Is Creating 'Mahogany Deserts'

...ermination begins -- thatthe tiny shoots need open sunlight to make food through the photosyntheticprocess. At a study site in Belize as well as in Mexico, Snook is dropping mahoganyseeds onto cornfields to see if the species can also be regenerated andmanaged in conjunction with shifting agriculture. "I'm ...

NCAR Scientists Trek To Africa For Biosphere-Atmosphere Chemistry Study

...arbons and oxides of nitrogen, which interact with sunlight to produce ozone and other smoglike products--often at levels approaching those of a high-pollution day in a major city. Satellite pictures show that the plumes of ozone stretch, at times, as far as South America. NCAR scientists have made several tr...

Scientists Trek to Africa for Biosphere-Atmosphere Chemistry Study

...arbons and oxides of nitrogen, which interact with sunlight to produce ozone and other smoglike products -- often at levels approaching those of a high-pollution day in a major city. Satellite pictures show that the plumes of ozone stretch, at times, as far as South America. EXPRESSO may shed light on a glo...

Hot 'Lanta: NASA, School Kids Team To Study How Trees Help Cities Keep Their Cool

...e. It's important to understand that just as much sunlight falls on cities as on woodlands of the same size. ...e effect thatmade life possible on Earth: incoming sunlight passes through the atmosphere and is absorbed at the ground. Thenow-warm objects reradiate this ener...

Ozone 'Chat Room' Provides Real-Time Air-Quality Research

...re behind the formation of ground-level ozone, and sunlight and high temperatures play key roles in driving atmospheric levels to the damaging point. Current EPA ozone attainment standards state that an area cannot exceed .12 parts per million of ozone averaged over an hour more than three times during ...

Oak Regeneration In Some Ohio Forests Is Failing, Researchers Find

...d gets as much as 10 to 15 percent of theavailable sunlight and has moderately dry soil. McCarthy coll...e burn project is having thedesired effect -- more sunlight is reaching the forest floor, which could begood news for oak seedlings. "Although we're sti...

Biogenic Emissions Higher Than Expected Over African Savanna

...ogen oxides (NOx). These react in the presence of sunlight to produce low-altitude ozone and other smog-like products. Satellite pictures show that the plumes of ozone stretch, at times, as far as South America. While stratospheric ozone shields us from ultraviolet radiation, closer to the earth this molec...

Keep Off The Grass - Reduce Air Pollution

...eatest in warm weather and at around midday, when sunlight is most intense," says Mr Galbally. 'No gases are released at night.' "After we cut the grass in the chamber, gas release from clover rose by a factor of 80, and emissions from grass increased by 180 times," says Mr Galbally. Cattle grazing ...

Montana And Other Scientists Report On Life In The Ice

...ts of gravel and sand in the sediment layer absorb sunlight duringthe Antarctic summer and create little pockets of water. The sediments, blownonto the lake by the wind and then buried, have bacteria and othermicroorganisms called cyanobacteria attached to them. In the presence of liquid water and ca...

Fragmentation Of Tropical Forests Can Create "Genetic Bottleneck," According To New University Of Georgia Study

...ere is little competition for thepasture trees for sunlight and nutrients, giving them superior abilities toflower and fruit. Second, the abundance of flowers may attract more hummingbirdsfor pollination. Finally, bats have easy pickings of the fruit and take themfrom the pasture trees to the forest fragment,...

Digging In And Taking Cover

...rs that would be mixed with Mars dirt and cured in sunlight to make shielding bricks or mats. "Hopefully, maybe you can do all of this on the surface and take very little material with you," he added....

New Research Shows That Swarms Of Mayflies Are Laying Their Eggs On Roads Rather Than Rivers

..., Hungarian researchers have found. Direct sunlight reflected off the surface of water is strongly polarisedin the horizontal plane. Many water-dwelling insects use this polarised light toidentify open stretches of water where they can lay their eggs during theirbrief mating period. Entomolog...

Study Pinpoints Rare Molecular 'Transitions' As Possible Cause Of Skin 'Photoaging'

...d-to-detect interactions betweenskin molecules and sunlight that eventually could cause the uncomplimentarycha... UV-A, a commonplace group of wavelengths in sunlight that reachesEarth's surface, has already been linked to skin photoaging, which produces"deep lines,"...

UV Skin Damage In A Different Light

... answer. Two scientists recently discovered that sunlight triggers a harmful reactionwhen it strikes a molec...nst ultraviolet A, whichaccounts for 95 percent of sunlight that reaches the earth. The work may also change the way researchers approach similar projects. In...

Hyperforin Is A Key To St. John's Wort, Researchers Say

...who take this product shouldavoid prolonged direct sunlight or should use a sunscreen with an SPF of 15 ormore, as photosensitivity may occur. The mood support supplement is available in food, drug and massmerchandise outlets. The 300-mg tablets should be taken three times daily.Optimal effectivenes...

Shedding Light On Circadian Rhythms

...ound what may be the missingmolecular link between sunlight and the circadian clocks in both mammals andfruit ...internal circadian clock resides in the brain, and sunlight is the cue thatrewinds this clock daily. Researchers have now found a biochemical pathway thatsenses...

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