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The action spectrum shows that UVA does not cause immediate reaction, but rather UV begins to cause photokeratitis and skin redness (with lighter skinned individuals being more sensitive) at wavelengths starting near the beginning of the UVB band at 315 nm, and rapidly increasing to 300 nm. The skin and eyes are most sensitive to damage by UV ...
Skin darkening from UVA exposure does not lead to significantly increased production of melanin or protection against sunburn. [9] In the second process, triggered primarily by UVB, there is an increase in production of melanin (melanogenesis), [ 10 ] which is the body's reaction to direct DNA photodamage (formation of pyrimidine dimers ) from ...
Low power consumption of semiconductors introduce UV disinfection systems that utilized small solar cells in remote or Third World applications. [ 114 ] UV-C LEDs don't necessarily last longer than traditional germicidal lamps in terms of hours used, instead having more-variable engineering characteristics and better tolerance for short-term ...
PUVA (psoralen and UVA) is an ultraviolet light therapy treatment for skin diseases: vitiligo, eczema, psoriasis, graft-versus-host disease, mycosis fungoides, large plaque parapsoriasis, and cutaneous T-cell lymphoma, using the sensitizing effects of the drug psoralen.
Photolyase is particularly important in repairing UV induced damage in plants. The photolyase mechanism is no longer working in humans and other placental mammals who instead rely on the less efficient nucleotide excision repair mechanism, although they do retain many cryptochromes. [11]
Psoralen is a mutagen, and is used for this purpose in molecular biology research.Psoralen intercalates into DNA and on exposure to ultraviolet (UVA) radiation can form monoadducts and covalent interstrand cross-links (ICL) with thymines, preferentially at 5'-TpA sites in the genome, inducing apoptosis.
Peter S. Kim (born April 27, 1958) is an American scientist. He was president of Merck Research Laboratories (MRL) 2003–2013 and is currently Virginia & D.K. Ludwig Professor of Biochemistry at Stanford University, Institute Scholar at Stanford ChEM-H, and Lead Investigator of the Infectious Disease Initiative at the Chan Zuckerberg Biohub.
The College (as it is called at UVA) offers more than 45 undergraduate majors and more than 24 graduate programs. On July 1, 2014, Ian Baucom began his tenure as the Buckner W. Clay Dean of the College and Graduate School of Arts & Sciences after serving 17 years in Duke University's Department of English. [3]