Human Hair Diversity
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Human Hair Diversity
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Author : John Gray
language : en
Publisher: Wiley-Blackwell
Release Date : 2001-05-03
Human Hair Diversity written by John Gray and has been published by Wiley-Blackwell this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-05-03 with Medical categories.
The book discusses the different basic hair types and how these have changed over thousands of years due to the movement and gradual blending of populations and more recently to the demands of fashion for straightening, colouring, curling or otherwise altering the hair. It begins with a description of the structure of different types of hair, and then describes how the spread of humans over the earth has led to so much hair diversity . The effect that differences in porosity, elasticity and texture have on different hair types is explained. Advice is given on how to treat hair to maintain its strength and condition and to avoid unnecessary hair loss, breakage or even scalp burn. The final chapters consider the various chemicals used in hair treatments, with their actions and interactions, and explains how to minimise the damage that careless treatment can inflict. Our hair is a unique asset, which we can use to represent an 'image,' express rebellion, or even attract a mate.
Hairmythology The Origin Of Hair Textures Uncover Your Hair I Tage
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Author : Lupita Samuels
language : en
Publisher: Litfire Publishing, LLC
Release Date : 2017-04-13
Hairmythology The Origin Of Hair Textures Uncover Your Hair I Tage written by Lupita Samuels and has been published by Litfire Publishing, LLC this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-04-13 with categories.
People, all over the world, tend to subscribe to the 'bad hair/good hair myth' as a benchmark for grading hair-quality; if not for themselves, then, for others. Historical facts, scientific facts, and fiction merge together in a dramatic, contemporary, background story, that sets the stage for demonstrating how differences in our 'hair-quality' came about. This book includes a workbook and reflection section which challenges the reader not only to rethink the "bad hair/good hair myth," but to possibly, deconstruct it.
Variation In Human Hair Morphology And Microstructure
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Author : Sandra Koch
language : en
Publisher:
Release Date : 2018
Variation In Human Hair Morphology And Microstructure written by Sandra Koch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Human hair varies considerably in form and color within an individual and among groups. I examined diversity within human hair, and conducted tests to determine the nature and pattern of differences in the size and shape of hair and the density and distribution of pigment granules (melanosomes). Differences in hair form and cuticle thickness are apparent between broadly defined geographic ancestry groups, but these categories do not necessarily reflect our modern, genetically admixed world.Using Transmission Electron Microscopy (TEM), I investigated the degree of cuticle variability within the hairs from individuals, hairs from peoples who shared similar ancestry, and among people with diverse ancestries. Measurable differences were found in cuticle thickness and in the number of cuticle layers among the populations studied. Hairs from people with African ancestry tend to have thinner cuticles with fewer layers making up the cuticle, while those from people of European and East Asian ancestry tend to have thicker cuticles made up of more layers. Samples of hairs from peoples of European and East Asian ancestry are not statistically significant in cuticle thickness and in the number of layers. Testing European and East Asian hairs against African hairs show statistically significant differences in the cuticle thickness and number of layers. Variation exists within and among human populations in hair color, degree of curl, cross-sectional shape, diameter, and length. Analyses of hair dimensions and the number and distribution of pigment particles within a hair cross section revealed variability among diverse populations, and demonstrated that hair traits are not easily separable into distinct categories by ancestry. These findings offer support for eliminating the use of the outdated three-category racial typologies used by many U.S.-trained forensic scientists. I observed general trait patterns that may be useful for future research and that point to the need for additional research on the effects of genetic admixture to better assess ancestry traits in human hair.
The Human Hair
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Author : Hermann Beigel
language : en
Publisher:
Release Date : 1869
The Human Hair written by Hermann Beigel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1869 with Hair categories.
The Human Hair Popularly And Physiologically Considered With Special Reference To Its Preservation And The Various Modes Of Its Decoration In All Countries
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Author : Alexander Rowland
language : en
Publisher:
Release Date : 1853
The Human Hair Popularly And Physiologically Considered With Special Reference To Its Preservation And The Various Modes Of Its Decoration In All Countries written by Alexander Rowland and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1853 with categories.
Chemical And Physical Behavior Of Human Hair
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Author : Clarence R. Robbins
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-02-23
Chemical And Physical Behavior Of Human Hair written by Clarence R. Robbins and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-23 with Medical categories.
Human hair is the subject of a remarkably wide range of scientific investigations. Its chemical and physical properties are of importance to the cosmetics industry, forensic scientists and to biomedical researchers. The fifth edition of this book confirms its position as the definitive monograph on the subject. Previous editions were recognized as “concise and thorough” (Journal of the American Chemical Society), “an invaluable resource” (Canadian Forensic Science Society Journal), and “highly recommended” (Textile Research Journal). Chemical and Physical Behavior of Human Hair is a teaching guide and reference volume for cosmetic chemists and other scientists in the hair products industry, academic researchers studying hair and hair growth, textile scientists and forensic specialists. Features of the Fifth Edition: Recent advances in the classification and characterization of the different proteins and genes in IF and keratin associated proteins in human hair are described. The mechanism and incidence of hair growth and loss and hair density vs. age of males & females are described for Asians, Caucasians and Africans in different scalp regions. Details of hair surface lipids and cuticle membranes provide a better understanding of the surface and organization of the CMC and its involvement in stress strain is presented. Recent evidence demonstrates a more bilateral structure in curly hair and a more concentric arrangement of different cortical proteins in straighter hair. SNPs involved in hair form (curl and coarseness) and pigmentation and genes in alopecia and hair abnormalities are described. The latest biosynthetic scheme for hair pigments and structures for these and the different response of red versus brown-black pigments to photodegradation is described. A new method for curvature on 2,400 persons from different countries and groups is used to assign curvature throughout this book. Additional data for age and effects on diameter, ellipticity, elastic modulus, break stress and other parameters are presented with much larger data sets featuring statistical analyses. Hair conditioning, strength, breakage, split ends, flyaway, shine, combing ease, body, style retention, manageability and feel parameters are defined and described. A new section of different life stages by age groups considering collective and individual changes in hair fiber properties with age and how these affect assembly properties.
Human Diversity Its Nature Extent Causes And Effects On People
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Author : Bernard Charles Lamb
language : en
Publisher: World Scientific
Release Date : 2015-10-28
Human Diversity Its Nature Extent Causes And Effects On People written by Bernard Charles Lamb and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-28 with Science categories.
Human diversity, with its myriad of different conditions involving biology, psychology, and social structures, remains one of the biggest challenges — and opportunities — facing the species. With many government and private firms now having diversity or equality officers, programmes or committees, it is clear that human diversity is a cornerstone of policy-making at the very highest echelons. All this points to a need for proper scientific and medical information on this topic — not soft 'politically correct' sociology.This book provides the hard facts on human similarities and differences, their causes and effects on people. It covers the whole range from normal to extreme human types, and presents — for the first time — much of the author's 25 years of original research on the subject. It can also act as a family medical guide to aspects of human function, structure and disease. It covers many human topics in a humane and understandable fashion, providing much material for information and discussion. It can be used as a handbook or textbook on human diversity, but is mainly popular science for the general public. A special feature of this book is the 140 colour photos that illustrate the diversity of human life, nearly all taken by the author himself.Given the vast nature of the subject, the book seamlessly integrates relevant data from multiple disciplines including medicine, biology, anthropology, genetics, psychology, evolution, languages, sociology, history and geography. Even controversial subjects such as race, class and culture are tackled head-on with no-nonsense scientific rigour.
A Treatise Upon The Human Hair Being A Complete Explanation Of It S Source And Formation Etc
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Author : William DAVEY (Mesmerist.)
language : en
Publisher:
Release Date : 1871
A Treatise Upon The Human Hair Being A Complete Explanation Of It S Source And Formation Etc written by William DAVEY (Mesmerist.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1871 with categories.
The Genetic Architecture And Evolutionary Function Of Human Scalp Hair Morphology
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Author : Tina Tina Lasisi
language : en
Publisher:
Release Date : 2021
The Genetic Architecture And Evolutionary Function Of Human Scalp Hair Morphology written by Tina Tina Lasisi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Most hair follicles on the human body have evolved to be miniaturized, rendering us practically 'naked'. Despite sparse body hair, we retain thick hair on our scalps that varies significantly among populations. Yet little is known of the evolutionary history of our scalp hair and its variation. It has been suggested that scalp hair, and tightly curled hair in particular, evolved to moderate thermal load in humans. However, this functional hypothesis has never been directly tested. Existing research on human hair variation has relied on subjective and qualitative descriptors of hair morphology and samples have been historically had a strong Eurocentric bias. Despite its relevance to several evolutionary hypotheses, scalp hair has yet to be studied in a comprehensive evolutionary, functional, and genetic framework. The functional work described in this dissertation revisits the recurrent question of the role of thermoregulation in shaping early human evolution. This work is the first to extensively investigate the potential role of scalp hair and variation in its morphology in modulating heat balance in humans. More broadly, the methods, samples, and hypotheses tested in this dissertation serve to replace racialized terminology and conceptions of human scalp hair variation. Current public discussions of human biological variation demonstrate that anthropologists must continue to oppose tendencies to perceive human variation in racial terms, and focusing on hair--one of the most visible and variable human traits--will provide anthropologists with evidence of how and why variation evolved. This dissertation synthesizes methods and knowledge from various disciplines with new data, generating an innovative perspective on both human origins and modern variation and laying the foundation for future work.
Atlas Of Human Hair
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Author : Robert R. Ogle Jr.
language : en
Publisher: CRC Press
Release Date : 2017-08-21
Atlas Of Human Hair written by Robert R. Ogle Jr. and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-21 with Law categories.
It fills a void in the resources available to researchers and practitioners in forensic hair examination by providing photographic archetypes for the microscopic characteristics of human hair and the variates of the characteristics seen in forensic examinations, including curl; color; pigment distribution and density; cortical fusi; and ovoid bodie