Major components environmental variability

The composition of inland sources is variable and may be quite different from seawater. Other minerals may be more important than the salt. The Dead Sea, for example, is a major source of magnesium and bromine. Various parts of the world have deposits of mixed sodium and potassium chlorides the potash is the more valuable component of these deposits, and the NaCl is often a waste product. Its disposal then can become an environmental problem [16]. 

Human hair is usually categorised ethnically into three major distinct groups Asian, Caucasian and African. Looking from the perspective of biological variability, environmental effects and diversity of fibre texture, it is remarkable how uniformly the amino acid makeup of protein components is across ethnic groups. The amino acid makeup of the protein components was reviewed by Wolfram and is depicted in Fig. 1 [1, 2, 18, 19]. 

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