| Tg | glass transition temperature |
|---|---|
| TP | temperature and pressure; temperature probe; temporal peak; temporoparietal; tension pneumothorax; t... |
| TPN | thalamic projection neuron; total parenteral nutrition; transition protein; triphosphopyridine nucle... |
| AODP | alcohol and other drug problems |
| CAVD | complete atrioventricular dissociation; completion, arithmetic problems, vocabulary, following direc... |
| isomeric transition | The transition of a nuclear isomer to a lower quantum state; e.g., 131mXe → 131Xe + g. (05 Mar 2000) |
|---|---|
| transition | 1. Passage from one place or state to another; charge; as, the transition of the weather from hot to cold. "There is no death, what seems so is transition." (Longfellow) 2. A direct or indirect passing from one key to another; a modulation. 3. A passing from one subject to another. "[He] with transition sweet, new speech resumes." (Milton) 4. <biology> Change from one form to another. This word is sometimes pronounced; but according to Walker, Smart, and most other authorities, the customary and preferable pronunciation is, although this latter mode violates analogy. Other authorities say . <geology> Transition rocks, a term formerly applied to the lowest uncrystalline stratified rocks (graywacke) supposed to contain no fossils, and so called because thought to have been formed when the earth was passing from an uninhabitable to a habitable state. Origin: L. Transitio: cf. F. Transition. See Transient. Source: Websters Dictionary (01 Mar 1998) |
| transition electron | An electron that moves from one energy level to another to fill a vacancy in a shell, with the emission of characteristic radiation. (05 Mar 2000) |
| transition mutation | A point mutation involving substitution of one base-pair for another, i.e., replacement of one purine for another and of one pyrimidine for another pyrimidine without change in the purine-pyrimidine orientation. (05 Mar 2000) |
| transition probability model | A model to account for the apparently random variation in cell cycle time between individual animal tissue cells in culture that postulates that transition from G1 to s phase is probabilistic. Contrasts with hypotheses that require the accumulation of critical levels of particular proteins. (18 Nov 1997) |
| transition protein | <molecular biology> In spermatogenesis, group of proteins that displace histones from nuclear DNA and that are in turn displaced by protamines to produce the transcriptionally inactive nuclear DNA characteristic of the sperm nucleus. (18 Nov 1997) |
| transition state | The activated state of a molecule that has partly undergone a chemicalreaction. (09 Oct 1997) |
| transition state intermediate | In a chemical reaction, an unstable and high-energy configuration assumed by reactants on the way to making products. Enzymes are thought to bindand stabilise the transition state, thus lowering the energy of activation needed to drive the reaction to completion. (09 Oct 1997) |
| transition temperature | <chemistry> The temperature at which there is a transition in the organisation of, for example: the phospholipids of a membrane where the transition temperature marks the shift from fluid to more crystalline. Usually determined by using an Arrhenius plot of activity against the reciprocal of absolute temperature, the transition temperature being that temperature at which there is an abrupt change in the slope of the plot. In membranes such phase transitions tend to be inhibited by the presence of cholesterol. (18 Nov 1997) |