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.
1 Administrator (business) , a person responsible for the performance or management of administrative business operations.2  Administrator of the Government, in various Commonwealth realms and territories. Administrator (law) , a person appointed by a court to handle the administration of an estate for someone who has died without a will. 2  Administration (law) , a procedure under the insolvency laws of a number of common law jurisdictions.