active methyl n.
A methyl group, bound to a quaternary ammonium ion or a tertiary sulfonium ion, that can take part in transmethylation reactions.
- Active object
active object programming An object each instance of which has its own thread running as well as its own copies of the object’s instance variables. (1998-03-08)
- Active monitor
active monitor networking A process in an IBM token ring network which ensures a token is present on the ring, removes circulating frames with unknown or invalid destinations, and performs introductions between machines on the ring. (1996-06-18)
- Active optics
noun (functioning as sing) a system to compensate for any deformation caused by gravity in the surface accuracy and alignment of the mirrors of an astronomical telescope by means of actuators that control the movable mirror supports
- Active principle
active principle active principle n. A constituent of a drug, usually an alkaloid or glycoside, on which the characteristic therapeutic action of the substance largely depends. Historical Examples Is it used by nerves as food, or used by lungs, heart, or any organ as an active principle in the magnetic or electric forces? Philosophy of […]