Perforating Disorders. Perforating Disorders. Classically, a group of disorders in which there is transepidermal elimination (âperforationâ) of components of the dermis, in particular collagen and/or elastic fibers (Table 79.1).
Nitrogen is a chemical element with symbol N and atomic number 7. It is the lightest pnictogen and at room temperature, it is a transparent, odorless diatomic gas. Nitrogen is a common element in the universe, estimated at about seventh in total abundance in the Milky Way and the Solar System.t is the lightest pnictogen and at room temperature, it is a transparent, odorless diatomic gas. Nitrogen is a common element in the universe, estimated at about seventh in total abundance in the Milky Way and the Solar System.
Ammonia is the chemical name for the molecular formula NH3, which is a compound of nitrogen and hydrogen. It is also known by the name azane.... Ammonia is the chemical name for the molecular formula NH3, which is a compound of nitrogen and hydrogen. It is also known by the name azane. Ammonia has the properties of a colorless gas with a strong, characteristic odor. It has a density approximately half that of air and liquefies easily. Liquid ammonia is known by the name ammonium hydroxide. The odor of ammonia is easily neutralized with sodium bicarbonate. Ammonia is frequently used as an industrial fertilizer, a cleansing agent, a nitrogen source in the fermentation industry, and an effective antimicrobial agent in the food industry.