| ABC | absolute basophil count; absolute bone conduction; acalculous biliary colic; acid balance control; a... |
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| ACS | acrocallosal syndrome; acrocephalosyndactyly; acute chest syndrome; acute confusional state; Alcon C... |
| BCW | biological and chemical warfare |
| CA | anterior commissure [Lat. commissura anterior]; calcium antagonist; California [rabbit]; cancer; Can... |
| CAS | calcarine sulcus; calcific aortic stenosis; Cancer Attitude Survey; carbohydrate-active steroid; car... |
| 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) |
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| 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) |
| linkage equilibrium | <genetics> Situation that should exist in a population undisturbed by selection, migration, etc., in which all possible combinations of linked genes should be present at equal frequency. The situation is no more common than are such undisturbed populations. (18 Nov 1997) |
| acute chemical pneumonitis | <chest medicine> Inflammation of the lungs which occurs secondary to exposure to a chemical, organic dust, fungus or mould. Chronic exposure can lead to chronic lung changes evident on chest X-ray. Symptoms include cough, fever, shortness of breath and wheezing. See: bird-handler's disease. (27 Sep 1997) |
| mechanico-chemical | Pertaining to, connected with, or dependent upon, both mechanics and chemistry; said especially of those sciences which treat of such phenomena as seem to depend on the laws both of mechanics and chemistry, as electricity and magnetism. Source: Websters Dictionary (01 Mar 1998) |
| chemical | 1. <chemistry> Of or pertaining to, chemistry. 2. A substance composed of chemical elements or obtained by chemical processes. (21 May 1997) |
| chemical and pharmacologic phenomena | Chemical, pharmacologic, and metabolic action and interaction of drugs. (12 Dec 1998) |
| chemical antidote | A substance that unites with a poison to form an innocuous chemical compound. (05 Mar 2000) |
| chemical attraction | The force impelling atoms of different elements or molecules to unite to form new substances or compounds. (05 Mar 2000) |
| chemical bond | The link between two atoms within a molecule. Different types of chemical bonds include hydrogen bonds, covalent bonds, and ionic bonds. (09 Oct 1997) |
| chemical burn | A burn due to a caustic chemical. (05 Mar 2000) |
| chemical cautery | Any substance that destroys tissue upon application. Synonym: chemical cautery, chemicocautery. (05 Mar 2000) |
| chemical ceptor | Ceptor that initiates chemical reactions in response to the appropriate stimuli. (05 Mar 2000) |
| chemical change | A process in which one or more substances are changed into one or more different substances. (09 Oct 1997) |