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 condition in which you lose the pigment of your skin. Pigment, or melanin, causes skin color and is produced by cells called âmelanocytes.â Most people with vitiligo lose pigment in patches of normally pigmented skin, which is... Read More. Vitiligo is a condition in which you lose the pigment of your skin. Pigment, or melanin, causes skin color and is produced by cells called âmelanocytes.â Most people with vitiligo lose pigment in patches of normally pigmented skin, which is replaced by flat, white patches with irregular borders.