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.
A Dr. Mehmet Oz, MD , Cardiology (Cardiovascular Disease), answered. The white patches caused by the skin condition vitiligo can spread to other locations or can stay in one area. The course is unpredictable and varies from person to person. Some people with vitiligo say that new patches form on skin that is under pressure or exposed to friction. This can happen from shaving or rubbing from jewelry or clothing.
Vitiligo is pigment loss due to the bodyâs immune system attacking pigment cells (melanocytes). Other associated immune system diseases include diabetes, pernicious anemia, thyroid disease, and Addisonâs disease. Vitiligo causes smooth, white skin patches, usually around the mouth and eyes, or on the back of the hands.lbinism. Albinism, an inherited disorder, is caused by the absence of the pigment melanin and results in no pigmentation in skin, hair, or eyes. Albinos have an abnormal gene, which restricts melanin production.