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.
Urea broth is formulated to test for rapid urease-positive organisms. The restrictive amount of nutrients coupled with the use of pH buffers prevent all but rapid urease-positive organisms from producing enough ammonia to turn the phenol red pink. Important: In our lab, we only use the urease broth, not the agar.