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Download e-book for kindle: Atlas of Human Hair: Microscopic Characteristics by Robert R. Ogle Jr., Michelle J. Fox

By Robert R. Ogle Jr., Michelle J. Fox

ISBN-10: 0849381347

ISBN-13: 9780849381348

It fills a void within the assets on hand to researchers and practitioners in forensic hair exam by way of delivering photographic archetypes for the microscopic features of human hair and the variates of the features visible in forensic examinations, together with curl; colour; pigment distribution and density; cortical fusi; and ovoid our bodies. those illustrations offer a uniform foundation for describing the features and their diversifications for forensic pros in differing geographical parts. The documentation of hair features utilizing the scoring approach defined during this atlas permits researchers to advance information concerning the frequency of features in the hairs of 1 or extra participants and the overview of no matter if sure hair features are co-dependent.

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Hair color, form, and degree of curl, however, can provide an indication of the geographical ancestry of the individual from whom a questioned hair originated. Those indications of the geographical heritage of an individual who is the source of a questioned hair can be of considerable value in the forensic examination of human hair, particularly with regard to providing investigative leads as to the possible regional ancestry of the individual from whom a questioned hair originated. 1 Regional Shaft Diameter The diameter for African ancestry hair is smaller than that for the other two groups,29 but note that these highly curled hairs will lie on their side oriented with the smaller diameter of the flattened cross-section of the hair facing upward.

The variates Rare, Common, and Profuse refer to the concentration of cortical fusi as they exist along the shaft of the hair in the medial and distal regions. Those variates are partitioned using the two photographic archetypes presented in Chapter 5. The term Rare refers to a low concentration of cortical ©1999 CRC Press LLC fusi along the shaft. The term Common refers to a greater concentration of cortical fusi along the shaft, and the term Profuse refers to a high concentration of cortical fusi along the shaft.

Repeated dyeing and bleaching of a hair may result in several lines of demarcation that might render a hair as being unusual, resulting in a hair comparison that might have greater significance. Permanent waved hairs sometimes may have buckles or bends in the hair shaft due to the use of perm curlers. These buckles may present themselves at roughly even intervals along the hair shaft due to the manner in which the hair is wrapped around the curler. , oval, flat) that is more consistent with curly hair.

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Atlas of Human Hair: Microscopic Characteristics by Robert R. Ogle Jr., Michelle J. Fox

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