| thyrotropin | <endocrinology> Polypeptide hormone (28 kD), secreted by the anterior pituitary gland, that activates cyclic AMP production in thyroid cells leading to production and release of the thyroid hormones (T4 and T3). T4 and T3 blood levels feedback on the pituitary gland and decrease thyroid stimulating hormone production when T3 and T4 levels are high. (27 Sep 1997) |
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| thyrotropin resistance | An autosomal recessive disorder in which the thyrocytes are unresponsive to thyrotropin. Compare: pseudohypoparathyroidism. (05 Mar 2000) |
| thyrotropin-producing adenoma | <tumour> A rare pituitary adenoma usually associated with hypo-or hyperthyroidism. (05 Mar 2000) |
| thyrotropin-releasing factor | Former name for thyrotropin-releasing hormone. (05 Mar 2000) |
| thyrotropin-releasing hormone | <protein> See thyrotrophic releasing hormone. (18 Nov 1997) |
| thyrotropin-releasing hormone stimulation test | TRH stimulation test, a test of pituitary response to injection of thyrotropin-releasing hormone, which normally stimulates pituitary secretion of thyroid-stimulating hormone (TSH, thyrotropin), used primarily to distinguish pituitary from hypothalamic causes of thyroid disorders; TSH does not rise in cases of pituitary dysfunction, but does rise in cases of hypothalamic disorders. (05 Mar 2000) |
| thyroxine | <drug, endocrinology> Thyroid hormone. (18 Nov 1997) |
| thyroxine sodium | A preparation obtained by the action of a limited amount of sodium carbonate upon thyroxine; it contains between 61 and 65% of iodine. See: sodium levothyroxine, sodium liothyronine. (05 Mar 2000) |
| thyroxine-binding globulin | An alpha-globulin of blood with a strong binding affinity for thyroxine; triiodothyronine is bound to it much less firmly; a deficiency or excess of this protein may occur as a rare benign X-linked disorder. Synonym: thyroxine-binding protein. (05 Mar 2000) |
| thyroxine-binding protein | An alpha-globulin of blood with a strong binding affinity for thyroxine; triiodothyronine is bound to it much less firmly; a deficiency or excess of this protein may occur as a rare benign X-linked disorder. Synonym: thyroxine-binding protein. (05 Mar 2000) |
| thyroxine-binding proteins | A group of proteins that includes thyroxine-binding globulin, a glycoprotein that serves as the major and specific carrier of thyroxine in plasma, accounting for 70-75% of the bound thyroxine; thyroxine-binding prealbumin, an albumin that serves as the secondary carrier, accounting for between 20 and 25% of the bound thyroxine; and serum albumin, which accounts for the remaining bound thyroxine. (12 Dec 1998) |
| thyrse | A branched inflorescence in which the main main stem is indeterminate and the lateral branches determinate in their growth. (09 Oct 1997) |
| thyrseus | A panicle-like inflorescence consisting of a slender indeterminate main axis with lateral axes determinate, i.e., cymose. (09 Oct 1997) |
| thyrsus | Origin: L, fr. Gr. Cf. Torso. 1. A staff entwined with ivy, and surmounted by a pine cone, or by a bunch of vine or ivy leaves with grapes or berries. It is an attribute of Bacchus, and of the satyrs and others engaging in Bacchic rites. "A good to grow on graves As twist about a thyrsus." (Mrs. Browning) "In my hand I bear The thyrsus, tipped with fragrant cones of pine." (Longfellow) 2. <botany> A species of inflorescence; a dense panicle, as in the lilac and horse-chestnut. Source: Websters Dictionary (01 Mar 1998) |
| thysanopter | <zoology> One of the Thysanoptera. Source: Websters Dictionary (01 Mar 1998) |