| STIR | short tau inversion recovery |
|---|---|
| t | Greek lower case letter tau; life [of radioisotope]; relaxation time; shear stress; spectral transmi... |
| S | Greek capital letter sigma; syphilis; summation of series |
| s | Greek lower case letter sigma; conductivity; cross section; millisecond; molecular type or bond; pop... |
| SR | sarcoplasmic reticulum; saturation recovery; scanning radiometer; screen; secretion rate; sedimentat... |
| PKC theta | Protein kinase C theta |
|---|---|
| sigma 54 | sigma N |
| sigma S | sigma factor |
| IFN tau | Interferon tau |
| N tau-MH | N tau-methyl histidine |
| tau | <radiobiology> Label generally used to represent confinement time (09 Oct 1997) |
|---|---|
| Tau protein | <cell biology> Protein (60-70 kD) that co purifies with tubulin through cycles of assembly and disassembly and the first microtubule associated protein to be characterised. Tau proteins are a family made by alternative splicing of a single gene. It has tandem repeats of a tubulin binding domain and promotes tubulin assembly. Although tau proteins are found in all cells they are major components of neurons where they are predominantly associated with microtubules of the axon. See: MAPs. (18 Nov 1997) |
| tau-protein kinase | <enzyme> Phosphorylates tau protein at four distinct sites Registry number: EC 2.7.1.135 Synonym: tpki kinase, tau protein kinase i (26 Jun 1999) |
| tau proteins | One of the two major classes of microtubule-associated proteins isolated from the brain. The proteins have two domains: one that binds to microtubules and a second that binds to other cell components. By binding to several unpolymerised tubulin molecules simultaneously, tau proteins speed up the nucleation process in tubulin polymerization. Chemically modified tau proteins also appear to be involved in the formation and/or composition of the neurofibrillary tangles and neuropil threads found in alzheimer disease. (12 Dec 1998) |
| tau-tubulin kinase | <enzyme> Mw 32 kD; phosphorylates tau, beta-tubulin, map2 and alpha-casein; novel and distinct fram tau protein kinase I and II Registry number: EC 2.7.10.- (26 Jun 1999) |
| theta | A letter of the Greek alphabet corresponding to th in English; sometimes called the unlucky letter, from being used by the judges on their ballots in passing condemnation on a prisoner, it being the first letter of the Greek qanatos, death. <mathematics> Theta function, one of a group of functions used in developing the properties of elliptic functions. Origin: L, fr. Gr. Qh^ta, the Greek letter <theta/, <THETA/. Source: Websters Dictionary (01 Mar 1998) |
| theta antigen | A surface glycoprotein that is present on thymocytes of mice and rats. (05 Mar 2000) |
| theta pinch | <radiobiology> A fast-pulsed pinch device in which the external current imposed goes in the azimuthal/circumferential direction (generally in a solenoid) around a cylindrical plasma. Use of a fast-rising solenoidal current causes a rapidly increasing axial magnetic field, which compresses and heats the plasma. Magnetohydrodynamic theory of the Theta Pinch is given in reference 6. (09 Oct 1997) |
| theta rhythm | Brain waves in the electroencephalogram which have a frequency of 4 to 7 per second. They occur mainly in children but also in adults during periods of emotional stress. (12 Dec 1998) |
| theta wave | Brain waves in the electroencephalogram which have a frequency of 4 to 7 per second. They occur mainly in children but also in adults during periods of emotional stress. (12 Dec 1998) |
| receptors, sigma | A class of cell surface receptors recognised by its pharmacological profile. Sigma receptors were originally considered to be opioid receptors because they bind certain synthetic opioids. However they also interact with a variety of other psychoactive drugs, and their endogenous ligand is not known (although they can react to certain endogenous steroids). Sigma receptors are found in the immune, endocrine, and nervous systems, and in some peripheral tissues. (12 Dec 1998) |
| sigma | The 18th letter of the Greek alphabet, σ. (05 Mar 2000) |
| sigma bond | <chemistry> A bond formed from the overlap of either two s-orbitals or two hybrid orbitals such as sp3 or sp2 orbitals. (09 Jan 1998) |
| sigma effect | The decrease in apparent viscosity that occurs when a suspension, such as blood, is made to flow through a tube of smaller diameter; observed in tubes less than about 0.3 mm in diameter. Synonym: sigma effect. (05 Mar 2000) |
| sigma factor | Initiation factor (86 kD) that binds to E. Coli DNA dependent RNA polymerase and promotes attachment to specific initiation sites on DNA. Following attachment, the sigma factor is released. (18 Nov 1997) |
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