| equilenin | <chemical> 3-hydroxyestra-1,3,5(10),6,8-pentaen-17-one. A naturally occurring steroid with oestrogenic activity obtained from the urine of pregnant mares. Chemical name: Estra-1,3,5,7,9-pentaen-17-one, 3-hydroxy- (12 Dec 1998) |
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| equilibration | 1. Act of keeping a balance, or state of being balanced; equipoise. "In . . . Running, leaping, and dancing, nature's laws of equilibration are observed." (J. Denham) 2. <biology> The process by which animal and vegetable organisms preserve a physiological balance. Source: Websters Dictionary (01 Mar 1998) |
| equilibrium | Balance A condition in which no further net change is occuring in a system, and free energy is minimimal. (09 Oct 1997) |
| equilibrium centrifugation | A type of density gradient centrifugation used to separate proteins or nucleic acids from a mixture. (09 Oct 1997) |
| equilibrium constant | <chemistry> The ratio of the reverse and forward rate constants for a reaction of the type: A + B = AB at equilibrium the equilibrium constant (K) equals the product of the concentrations of reactants divided by the concentration of product and has dimensions of concentration. Kd = (concentration A.concentration B) / (concentration AB). The affinity constant (Ka) is the reciprocal of the equilibrium constant. Dimension: moles per litre. In general the concept of Kd is more readily understood than that of Ka, for example: in considering the conversion of A to AB by the binding of ligand B, the Kd = B when A = AB. Thus Kd is equal to the ligand concentration which produces half maximal conversion (response). (10 Jan 1998) |
| equilibrium dialysis | In immunology, a method for determination of association constants for hapten-antibody reactions in a system in which the hapten (dialyzable) and antibody (nondialyzable) solutions are separated by semipermeable membranes. Since at equilibrium the quantity of free hapten will be the same in the two compartments, quantitative determinations can be made of hapten-bound antibody, free antibody, and free hapten. (05 Mar 2000) |
| equilibrium potential | <physiology> The membrane potential at which a particular type of ion or other particle does not diffuse through the membrane in either direction. (09 Oct 1997) |
| equilin | <chemical> 3-hydroxyestra-1,3,5(10)7-tetraen-17-one. A naturally occurring steroid with oestrogenic activity obtained from the urine of pregnant mares. Chemical name: Estra-1,3,5(10),7-tetraen-17-one, 3-hydroxy- (12 Dec 1998) |
| equimolar | Containing an equal number of moles or having the same molarity, as in two or more substances. (05 Mar 2000) |
| equimolecular | Containing an equal number of molecules, as in two or more solutions. (05 Mar 2000) |
| equimomental | <mechanics> Having equal moments of inertia. Two bodies or systems of bodies are said to be equimomental when their moments of inertia about all straight lines are equal each to each. Equimomental cone of a given rigid body, a conical surface that has any given vertex, and is described by a straight line which moves in such manner that the moment of inertia of the given rigid body about the line is in all its positions the same. Source: Websters Dictionary (01 Mar 1998) |
| equimultiple | <mathematics> One of the products arising from the multiplication of two or more quantities by the same number or quantity. Thus, seven times 2, or 14, and seven times 4, or 28, are equimultiples of 2 and 4. Source: Websters Dictionary (01 Mar 1998) |
| equine | <zoology> Relating to, affecting, resembling or derived from a horse. (09 Oct 1997) |
| equine abortion virus | <virology> A herpesvirus reported in the U.S. Europe, and South Africa, causing equine rhinopneumonitis and equine virus abortion. Synonym: equine abortion virus. (05 Mar 2000) |
| equine arteritis virus | <virology> A virus of the genus Pestivirus, a member of the family Togaviridae, that causes equine viral arteritis. It is probably the most common cause of equine influenza and an important equine respiratory disease frequently causing abortion, pneumonia, or other infections. Synonym: infectious arteritis virus of horses. (05 Mar 2000) |