A method is described which permits rapid phenotypic diagnosis of the Lesch - Nyhan heterozygote by direct assay of hypoxanthine guanine phosphori - bosyltransferase activity in single hair follicles obtained from the scalp. (science.sciencemag.org)
German Shepherds have two coats: a longer, firm outer coat with coarse hairs that usually shed out as single hairs and a softer, fluffier undercoat that sheds in big clumps. (germanshepherdcentral.net)
Although diffraction patterns have been examined and reported in several publications in the past, they involved bundles of hair fibers or microdiffraction on single hair fibers — and, most significantly, the X-ray beam was always oriented perpendicular to the hair fiber axis. (sciencedaily.com)