the free energy of the reactants is greater than that of the products. induced-fit model. A model of enzyme-catalyzed reactions in which the enzyme changes shape when substrates bind to the active site; this change in shape is called an induced fit. lock-and-key model A model of enzyme-catalyzed reactions in which the enzyme is a rigid lock and the substrates are the keys that fit into the lock and then react.
System administrator. For the privileged user account, see Superuser. A system administrator, or sysadmin, is a person who is responsible for the upkeep, configuration, and reliable operation of computer systems; especially multi-user computers, such as servers.
Network administrator, engineers involved in computer networks; Server administrator, a person who acts as the administrator for an Internet gaming or other type of server; Superuser, a type of computer user with administrative privileges; Sysop, a commonly used term for a system operator, an administrator of a multi-user website Wikipedia administrators