The pit does not have any magical properties. What turns the guac brown is the air. If you can keep air from touching the guac then it will stay green. The pit will keep a portion away from the air, but what is more affective is to put plastic wrap over it and push it right down onto the surface.
Denuded skin is just another way of saying that the top layer (epidermis) of skin is gone...either from friction (abrasion or tear), trauma (tape burns), or severe rashes, or from a stage II pressure ulcer.
Normal Pressure Hydrocephalus. Normal Pressure Hydrocephalus (NPH) is caused by a pressure gradient in the spinal fluid-producing regions of the brain known as the ventricles and is depicted in the MRI picture to the right as the dark region within the red oval. The ventricles are much larger than normal.