| transparent dentin | Dentin characterised by calcification of the dentinal tubules as a result of injury or normal aging. Synonym: transparent dentin. (05 Mar 2000) |
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| transparent septum | A thin plate of brain tissue, containing nerve cells and numerous nerve fibres, that is stretched like a flat, vertical sheet between the column and body of fornix below, the corpus callosum above and anteriorly; it is usually fused in the median plane with its partner on the opposite side so as to form a thin, median partition between the left and right frontal horn of the lateral ventricles; in less than 10% of humans there is a blind, slitlike, fluid-filled space between the two transparent septa, the cavity of septum pellucidum. The transparent septum is continuous ventralward through the interval between the corpus callosum and the anterior commissure with the precommissural septum and subcallosal gyrus. See: cavity of septum pellucidum, septal area. Synonym: septum pellucidum, septum lucidum. (05 Mar 2000) |
| transparent ulcer of the cornea | An obsolete term for an ulcer of the cornea, occurring usually in children, that heals without opacity. (05 Mar 2000) |
| transparietal | Through or across a parietal region, area, or structure. (05 Mar 2000) |
| transpeptidase | <enzyme> An enzyme that catalyses the formation of an amide linkage between a free amino group and a carbonyl group within an existing peptide linkage. (18 Nov 1997) |
| transpeptidation | <molecular biology> The formation of peptide bonds betweent the short peptides present in the cell wall polymer, peptidoglycan. (09 Oct 1997) |
| transperitoneal | Through the peritoneum; e.g., denoting a nephrectomy performed by abdominal section. (05 Mar 2000) |
| transphosphatases | <enzyme> A rather large group of enzymes that transfers a phosphate group from a donor to an acceptor. They are important in metabolism and comprise not only those transferring phosphate but also diphosphate, nucleotidyl residues, and others. These have also been subdivided according to the acceptor group. Registry number: EC 2.7 Alcohol group acceptor: A group of enzymes that transfers a phosphate group onto an alcohol group acceptor. Registry number: EC 2.7.1 Carboxyl group acceptor: A class of enzymes that transfers phosphate groups and has a carboxyl group as an acceptor. Registry number: EC 2.7.2 Nitrogenous group acceptor: A group of enzymes that catalyses the transfer of a phosphate group onto a nitrogenous group acceptor. Registry number: EC 2.7.3 Paired acceptors: A group of enzymes that transfers two phosphate groups from a donor such as ATP to two different acceptors. Registry number: EC 2.7.9 Phosphate group acceptor: A group of enzymes that catalyses the transfer of a phosphate group onto a phosphate group acceptor. Registry number: EC 2.7.4 Phosphomutases: A group of enzymes that catalyze an intramolecular transfer of a phosphate group. It has been shown in some cases that the enzyme has a functional phosphate group, which can act as the donor. These were previously listed under phosphotransferases (ec 2.7.-). Registry number: EC 5.4.2 (04 Jul 1999) |
| transphosphorylases | See: phosphotransferases, phosphorylases, kinase. (05 Mar 2000) |
| transphosphorylation | A reaction involving the transfer of a phosphoric group from one compound to another, often with the involvement of ATP, as by the action of a phosphotransferase or kinase. (05 Mar 2000) |
| transpirable | Capable of transpiring or being transpired. (05 Mar 2000) |
| transpiration | Loss of water vapour from land plants into the atmosphere, causing movement of water through the plant from the soil to the atmosphere via roots, shoot and leaves. Occurs mainly through the stomata. (18 Nov 1997) |
| transpire | 1. <physiology> To pass off in the form of vapor or insensible perspiration; to exhale. 2. <botany> To evaporate from living cells. 3. To escape from secrecy; to become public; as, the proceedings of the council soon transpired. "The story of Paulina's and Maximilian's mutual attachment had transpired through many of the travelers." (De Quincey) 4. To happen or come to pass; to occur. This sense of the word, which is of comparatively recent introduction, is common in the United States, especially in the language of conversation and of newspaper writers, and is used to some extent in England. Its use, however, is censured by critics of both countries. Origin: F. Transpirer; L. Trans across, through + spirare to breathe. See Spirit. 1. <physiology> To excrete through the skin; to give off in the form of vapor; to exhale; to perspire. 2. <botany> To evaporate (moisture) from living cells. Source: Websters Dictionary (01 Mar 1998) |
| transplacental | Crossing the placenta. (05 Mar 2000) |
| transplant | 1. To remove, and plant in another place; as, to transplant trees. 2. To remove, and settle or establish for residence in another place; as, to transplant inhabitants. "Being transplanted out of his cold, barren diocese of St. David into a warmer climate." (Clarendon) Origin: F. Transplanter, L. Transplantare; trans across, over + plantare to plant. See Plant. Source: Websters Dictionary (01 Mar 1998) |