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.
Spread of the virus that causes hepatitis B (HBV) occurs when a bodily fluid of an infected person enters the body of an uninfected person. So, HBV spreads by having unprotected sex with an infected person, sharing needles for drugs, steroids, piercing, or tattooing, infected sharps, or from mother to baby during birth.pread of the virus that causes hepatitis B (HBV) occurs when a bodily fluid of an infected person enters the body of an uninfected person. So, HBV spreads by having unprotected sex with an infected person, sharing needles for drugs, steroids, piercing, or tattooing, infected sharps, or from mother to baby during birth.