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.
There's no way to know if your vitiligo patches will spread or go away. So much is unknown about this chronic skin condition that results in depigment There's no way to know if your vitiligo patches will spread or go away. So much is unknown about this chronic skin condition that results in depigmentation or white patches of skin on the body. Some people with vitiligo get a few white patches of skin while others have large depigmented areas spread all over their body, leaving them with little pigmentation in their skin. Sometimes physical or emotional stress can trigger the spreading of vitiligo. If your vitiligo is related to an autoimmune disease such as type 1 diabetes, Graves disease (thyroiditis), or hypopituitarism, the progression of vitiligo may be different. Talk to your doctor to learn more about vitiligo and how it affects you.