In their mind, HIV infection may be a natural result of a wrongful act. They may feel that HIV is a punishment for the crime they committed and that the guilt they have to bear is both reasonable and deserved. Culture often plays a big role in this.
What is it used for? Urea is used to treat chronic dry skin conditions, such as eczema. It is also used to treat skin conditions that cause dry, thickened, scaly, flaky and cracked skin (ichthyosis, xeroderma) and thickening of the outermost layer of the skin (hyperkeratosis). It is an emollient, also known as a moisturiser.
While over 90% of urea produced is used as a fertilizer, it has other uses, which include the manufacture of the melamine, used in melamine-methanal resins. Urea itself also forms important resins. An increasingly important use of urea is in reducing air pollution from diesel engines in cars, buses and lorries.owever it is not possible to use ammonia directly as it is too volatile and is poisonous. Instead a solution of urea in water is injected into the hot gases emerging from the engine in the exhaust. Urea is thermally decomposed to ammonia and carbon dioxide. This is the reverse of the process used to make ammonia: