| dissociation constant of a base | Expressed by the general equation [B+][OH-]/[BOH] = Kb, where BOH is the undissociated base. (05 Mar 2000) |
|---|---|
| dissociation constant of an acid | Expressed by general equation [H+][A-]/[HA] = Ka, where HA is the undissociated acid. (05 Mar 2000) |
| dissociation constant of water | Expressed by the equation [H+][OH-] = Kw = 10-14 at 25캜. (05 Mar 2000) |
| dissociation sensibility | The loss of the pain and the thermal senses with preservation of tactile sensibility or vice versa. (05 Mar 2000) |
| dissociative anaesthesia | A form of general anaesthesia, but not necessarily complete unconsciousness, characterised by catalepsy, catatonia, and amnesia, especially that produced by phenylcyclohexylamine compounds, including ketamine. (05 Mar 2000) |
| dissociative disorders | Sudden temporary alterations in the normally integrative functions of consciousness. (12 Dec 1998) |
| dissociative hysteria | An unconscious process sometimes seen in patients with multiple personalities, or in hysteria, in which a group of mental processes is separated from the rest of the thinking processes, resulting in an independent functioning of these processes and a loss of the usual relationships among them. (05 Mar 2000) |
| dissociative reaction | Reaction characterised by such dissociative behaviour as amnesia, fugues, sleepwalking, and dream states. (05 Mar 2000) |
| dissociative recombination | <radiobiology> The combination of an electron with a positive molecular ion, followed by dissociation of the molecule in which the resulting atoms/molecules carry off the excess energy released in the recombination. (09 Oct 1997) |
| dissolution | 1. The act of dissolving, sundering, or separating into component parts; separation. "Dissolutions of ancient amities." (Shak) 2. Change from a solid to a fluid state; solution by heat or moisture; liquefaction; melting. 3. Change of form by chemical agency; decomposition; resolution. "The dissolution of the compound." (South) 4. The dispersion of an assembly by terminating its sessions; the breaking up of a partnership. "Dissolution is the civil death of Parliament." (Blackstone) 5. The extinction of life in the human body; separation of the soul from the body; death. "We expected Immediate dissolution." (Milton) 6. The state of being dissolved, or of undergoing liquefaction. "A man of continual dissolution and thaw." (Shak) 7. The new product formed by dissolving a body; a solution. 8. Destruction of anything by the separation of its parts; ruin. "To make a present dissolution of the world." (Hooker) 9. Corruption of morals; dissipation; dissoluteness. Origin: OE. Dissolucioun dissoluteness, F. Dissolution, fr. L. Dissolutio, fr. Dissolvere. See Dissolve. Source: Websters Dictionary (01 Mar 1998) |
| dissolve | To change or cause to change from a solid to a dispersed form by immersion in a fluid of suitable properties. Origin: L. Dis-solvo, pp. -solutus, to loose asunder, to dissolve (05 Mar 2000) |
| dissolved oxygen | <biochemistry> The concentration of oxygen dissolved in water, expressed in mg/l or as percent saturation, where saturation is the maximum amount of oxygen that can theoretically be dissolved in water at a given altitude and temperature. (11 Jan 1998) |
| dissolvent | Having power to dissolve power to dissolve a solid body; as, the dissolvent juices of the stomach. Origin: L. Dissolvens, -entis, p. Pr. Of dissolvere. 1. That which has the power of dissolving or melting other substances, especially. By mixture with them; a menstruum; a solvent. "Melted in the crucible dissolvents." (A. Smith) "The secret treaty of December acted as an immediate dissolvent to the truce." (Mothley) 2. <medicine> A remedy supposed capable of dissolving concretions in the body, such as calculi, tubercles, etc. Source: Websters Dictionary (01 Mar 1998) |
| dissonance | In social psychology and attitude theory, an aversive state which arises when an individual is minimally aware of inconsistency or conflict within himself. See: cognitive dissonance theory. Origin: L. Dissonus, discordant, confused (05 Mar 2000) |
| disspermous | <botany> Containing only two seeds; two-seeded. Origin: Gr. = + seed, fr. To sow: cf. F. Disperme. Source: Websters Dictionary (01 Mar 1998) |