Thioglycolic acid corresponding disulfide (2-[(carboxymethyl)disulfanyl]acetic acid or dithiodiglycolic acid): Thioglycolic acid, usually as its dianion, forms complexes with metal ions. Such complexes have been used for the detection of iron, molybdenum, silver, and tin. Thioglycolic acid reacts with diethyl acetylmalonate to form acetylmercaptoacetic acid and diethyl malonate, the reducing agent in conversion of Fe(III) to Fe(II). Scientist David R. Goddard, in the early 1930s, identified TGA as a useful reagent for reducing the disulfide bonds in proteins, including keratin (hair protein), while studying why protease enzymes could not easily digest hair, nails, feathers, and such. He realized that while the disulfide bonds,
Artificial nails nails are an extension, not a replacement, of natural nails. There are two main approaches to creating artificial nails—"tips" and "forms". Atop these, either acrylic, hard gel, or any combination of both may be applied. Tips are available in many different designs, ranging from solid colors like gel or regular nail polish to graphic designs such as animal prints and metallic colors. Artificial nails can be shaped, cut, and filed into a variety of shapes, including square, squared oval/"squoval", rounded, almond, ballerina/coffin, or stiletto. One popular material used to create acrylic nails is poly methyl methacrylate acrylic (PMMA). Mixing said