Surgicel is a hemostatic agent (blood-clot-inducing material) made of an oxidized cellulose polymer (the unit is polyanhydroglucuronic acid), manufactured by the Ethicon subsidiary of Johnson And Johnson. It was introduced into clinical practice in 1947. It is used to control post-surgical bleeding.
Multi Stage: (More than one level of heating or cooling) Multi Stage heating means that you have two levels of heat in your home. You will perhaps have a furnace and another method of heat like a solar panel. The second level of heat is commonly referred to as an emergency heat setting.
Multi Stage Heat Pump: (Most advanced) This system uses more than one system just like the multi stage but it uses a heat pump as the emergency heating or cooling. You will have a typical heating or cooling unit and rely on the heat pump to help your typical system heat or cool faster and more efficiently.