Methods in Molecular Biology Volume 113 by DNA Repair Protocols 1st Edition by Daryl Eukaryoti ISBN 1617371963 9781617371967

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Authors:Daryl S. Henderson , Series:Forensic [2] , Tags:Forensic Medicine and Toxicology , Author sort:Henderson, Daryl S. , Languages:Languages:eng , Publisher:Humana Press , Comments:Comments:UV-A, UV-B, and UV-C: This terminology, which divides the ultraviolet(UV) spectrum into three wave bands, was first proposed in 1932 by the Americanspectroscopist William Coblentz and his colleagues to begin to addressthe problem of standardizing the measurement of UV radiation used in medicine(1,2). Each spectral band was defined “provisionally” and “approximately”by the absorption characteristics of specific glass filters as follows: UV-A,400–315 nm; UV-B, 315–280 nm; UV-C, <280 nm (1). Although based onphysical specifications, these definitions were influenced by knowledge ofother UV phenomenology, including biological effects and physical properties.For example, wavelengths in the UV-B band were known to have potenterythemic effects, and wavelengths below 290 nm were known to be absentfrom sunlight (2) (because they are absorbed by stratospheric ozone). Moreover,the germicidal effects of UV-C wavelengths (principally around 266nm) from artificial sources were well-recognized (3). Today, the spectral bandsimplied by these terms may be found to vary from Coblentz’s original definitions,depending on the discipline. Environmental photobiologists, for example,generally use the following definitions: UV-A, 400–320, UV-B, 320–290, andUV-C, 290–200 (4).Relative centrifugal forces: The g-forces listed in this book are calculatedfor the maximum radius unless stated otherwise. For microcentrifugessimilar to Eppendorf’s 5410 and 5415 C models, maximum rotational speed(14,000 rpm) corresponds to ~12,000g and ~16,000g, respectively