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.
administrator-Investment & Finance Definition. 1  A person who is appointed by a probate court to manage the settlement of an estate of someone who died intestate, or without a will. 2  A person who manages an organization, often a non-profit organization.dministrator-Computer Definition. A key role played by a computer professional who oversees the network operation, installs programs on a network, configures them for distribution, and updates security settings.