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 a disease where patches of skin become discolored. About 30% of people with vitiligo also have a family member with it. This means genetics almost certainly has something to do with it. But for reasons I'll get to in a second, there are probably other factors involved too.mmune Cells Gone Wild Causes Vitiligo. You get your skin color because of a pigment called melanin. This pigment is made in certain cells called melanocytes. People with vitiligo have white patches on their skin because their immune system has killed the melanocytes there. No melanocytes, no melanin, white skin.