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.
In segmental vitiligo, the white patches are usually exclusive to only one side of the body, and do not usually spread or worsen after the first six months of appearance. Focal. In this type, the depigmentation is limited to one or only few areas of the body.itiligo. Vitiligo is a chronic disease that causes skin depigmentation. The disease promotes the development of unsightly white patches, and can severely alter ones appearance. The body's white blood cells attack the skin's pigment cells due to a genetic mutation.