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Accreditation-Based Systems: Third-party whitelist programs that certify senders to convince ISPs that those using the systems are legitimate mailers who should not be blocked. Examples include: Bonded Sender from Retur . . . View Full Definition

Organ Systems: Groups of organs that perform related functions.

Open Systems Interconnection (OSI): A reference model developed by the International Organization of Standardization. It splits networking into seven layers which provide specific services and communications standards.

Photosystems: Clusters of several hundred molecules of chlorophyll in a thylakoid in which photosynthesis takes place. Eukaryotes have two types of photosystems: I and II. The series of green photorecepti . . . View Full Definition

Semi-Permanent Pressure Systems: A relatively stable, stationary pressure-and-wind system where the pressure is predominately high or low with the changing season. They are not of a transitory nature, like migratory lows th . . . View Full Definition

Systems of Care: A system of care is a process of partnering an array of service agencies and families, working together to provide individualized care and supports designed to help children and families ach . . . View Full Definition

Low-Flow Irrigation Systems: These systems (drip, trickle, and micro sprinklers) provide water in small volumes and generally provide water to plants with less waste than furrow irrigation. Drip and trickle systems appl . . . View Full Definition

Insulation Systems: Five specialized elements are used, which together constitute the motor's INSULATION SYSTEM. The following are typical in an AC motor: 1. TURN-TO-TURN INSULATION between separate wires in ea . . . View Full Definition

Alternate Delivery Systems (ADS): TV homes with unwired cable access are referred to as having Alternate Delivery Systems. The four components of ADS are. Direct Broadcast Satellite (DBS): Satellite service delivered directl . . . View Full Definition

Advanced Television Systems Committee (ATSC): An acronym for Advanced Television Systems Committee, and the name of the DTV system used by broadcasters in the U.S. In European they use the COFDM standard. A digital tuner made for use in . . . View Full Definition