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.
Nitrogen wastes. The nitrogen compounds through which excess nitrogen is eliminated from organisms are called nitrogenous wastes (/naÉªËtrÉdÊáµ»nÉs/) or nitrogen wastes. They are ammonia, urea, uric acid, and creatinine. All of these substances are produced from protein metabolism.