Atomic clock. An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS. The principle of
From Wikipedia, the free encyclopedia. Wound healing is the process by which skin or other body tissue repairs itself after trauma. In undamaged skin, the epidermis (surface layer) and dermis (deeper layer) form a protective barrier against the external environment.
During the healing process, the skin undergoes many changes. Itching (pruritus) becomes common problem as the skin tightens and pulls and layers of new skin appear.Itching is more common with second-degree burns or when skin grafts have been put on the wound. The healing skin may feel dry, hot, and itchy and cause problems staying focused on projects or sleeping. Treatment may include over-the-counter antihistamines such as Benadryl as well as massage and cold packs on the wound. Sometimes topical ointments, including emollients, are recommended to calm the skin itching.