1 Therefore, the idea is to use a set of optimum conditions to get the most efficient yield of ammonia and this involves getting a low % yield (e.g. 8% - 15% conversion) but fast. 2  Described below are the conditions to give the most economic production of ammonia.
Causes of Vitiligo. Melanin is the pigment that gives the skin its characteristic color. Vitiligo is caused by a loss of pigment in the skin, due to destruction of pigment-forming cells known as melanocytes. The exact cause of the destruction of these cells is not known. One possible explanation might be that the body's immune system destroys the cells, as in other autoimmune conditions.
Vitiligo is a pigment disorder that affects the skin. It is primarily the result of the destruction of the melanocytes (the cells responsible for the skin pigmentation). When vitiligo affects the skin, white patches appear on it. These white patches can also appear on mucosal membranes and the retina. Often, the hairs growing in the part of the skin affected by vitiligo also turn white.