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Chemical hair analysis is used for the detection of many therapeutic drugs and recreational drugs, including cocaine, heroin, benzodiazepines and amphetamines. [3] [4] Hair analysis is less invasive than a blood test, if not quite as universally applicable. In this context, it has been reliably used to determine compliance with therapeutic drug ...
In mainstream scientific usage, hair analysis is the chemical analysis of a hair sample. The use of hair analysis in alternative medicine as a method of investigation to assist alternative diagnosis is controversial [1] [2] and its use in this manner has been opposed repeatedly by the AMA because of its unproven status and its potential for healthcare fraud.
Hair testing analyzes the hair shaft, rather than body fluids like urine or saliva, to determine whether illegal drugs are present. Compared to analysis of body fluids, hair testing is highly resistant to evasion by adulterating or substituting samples, or by simply abstaining from drug use for a few days.
Intense pulsed light (IPL) is a technology used by cosmetic and medical practitioners to perform various skin treatments for aesthetic and therapeutic purposes, including hair removal, photorejuvenation (e.g. the treatment of skin pigmentation, sun damage, and thread veins) as well as to alleviate dermatologic diseases such as acne.
The hair is hygroscopic (tending toward retaining moisture); its length changes with humidity, and the length change may be magnified by a mechanism and indicated on a dial or scale. Swiss physicist and geologist Horace Bénédict de Saussure was the first to build such a hygrometer, in 1783.
Archaeological materials, such as bone, organic residues, hair, or sea shells, can serve as substrates for isotopic analysis. Carbon, nitrogen and zinc isotope ratios are used to investigate the diets of past people; these isotopic systems can be used with others, such as strontium or oxygen, to answer questions about population movements and cultural interactions, such as trade.
A hair weave is a human or artificial hair utilized for integration with one's natural hair. Weaves can alter one's appearance for long or short periods of time by adding further hair to one's natural hair or by covering the natural hair together with human or synthetic hairpieces.
The formalin assay is the most popular chemical assay of nociception.It entails the injection of a dilute solution of formalin into the surface of the rodent's hindpaw, followed by the scoring of stereotypical behaviors such as flinching, licking, and biting of the affected hindpaw. [1]
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