the burning test is normally made on a small sample of yarns which are twisted together. since the yarns used in one direction of a fabric are not always comprised of the same fibers used in the other direction, warp and filling yarns should be burned separately. return to index test procedures select...
manganese (mn) - not to be confused with magnesium - is the chemical element with atomic number . it's also an essential constituent of many enzymes in the body. as such, it is essential for development, metabolism, wound healing and the antioxidant system. foods high in manganese include nuts, seeds...
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five tons of waste for every woman, man, and child. according to the union of concerned scientists, the laws regulating animal waste are nowhere near as strict as those regulating human waste, and the sierra club notes that the existing laws are often not enforced. this is particularly alarming because...