| kinetic analyzer | An instrument that measures the rate of change in a chemical substance; used mainly for enzyme measurement. (05 Mar 2000) |
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| kinetic ataxia | Ataxia developing upon attempting to perform coordinated muscular movements. Synonym: kinetic ataxia. (05 Mar 2000) |
| kinetic energy | <chemistry> Energy due to the motion of an object (09 Jan 1998) |
| kinetic measurement | Continuous or frequent monitoring of the readings in a chemical reaction to determine its rate. (05 Mar 2000) |
| kinetic molecular theory | <chemistry> This theory assumes that molecules must collide in order to react. The more collisions the more likely it is for a reaction to occur. However, depending on the conditions, only a small fraction of the collisions are effective in producing a reaction. There are several constraints. In order for a reaction to occur, bonds initially are broken, which requires energy. This energy depends on the type of the reaction and comes from the kinetic energies that the molecules possess before the collision. It is called the activation energy. Increasing the temperature increases the kinetic energies and more collisions will occur. In adition, at a higher temperature a greater number of the reacting molecules might possess an energy equal to or greater than the activation energy. However the molecules must also collide in a specific orientation, called the steric factor in order for a reaction to occur. A reaction will only be successful, if the collision has enough energy to be either equal to or greater than the activation energy and if the orientation of the collision allows for correct bond formation. These factors are in the Arrhenius equation: k = zp The rate constant k is proportional to the Arrhenius factor A. A is the product of the collision frequency z, and the steric factor p. The fraction of collisions with sufficient energy to produce a reaction are in the term of the equation. (09 Jan 1998) |
| kinetic perimetry | Mapping of the visual field by using a moving rather than a static test object. (05 Mar 2000) |
| kinetic strabismus | Strabismus due to spasm of an extraocular muscle. (05 Mar 2000) |
| kinetic system | A term proposed by G.W. Crile to denote the chain of organs through which latent energy is transformed into motion and heat: it includes the brain, the thyroid, the adrenals, the liver, the pancreas, and the muscles, that part of the neuromuscular system whereby active movements are effected; distinguished from the static system. (05 Mar 2000) |
| kinetic tremor | <neurology> A tremor which arises or which is intensified when a voluntary, coordinated movement is attempted. (18 Nov 1997) |
| kinetics | <physics> See Dynamics. Source: Websters Dictionary (01 Mar 1998) |
| kinetin | <plant biology> A cytokinin used as a component of plant tissue culture media. Obtained by heat treatment of DNA and does not occur naturally in plants. (18 Nov 1997) |
| kinetins | Cell division factors found in various plant parts and in yeast and used as plant growth regulators. (12 Dec 1998) |
| kineto- | Motion. Origin: G. Kinetos, moving, movable (05 Mar 2000) |
| kinetocardiogram | One type of graphic recording of the vibrations of the chest wall produced by cardiac activity. (05 Mar 2000) |
| kinetocardiograph | A device for recording precordial impulses due to cardiac movement; the absolute displacement of a point on the chest wall is recorded relative to a fixed reference point above the recumbent patient. (05 Mar 2000) |