| thymopoietins | Two closely related polypeptides (molecular weight 7,000) isolated from the thymus gland. These hormones induce the differentiation of prothymocytes to thymocytes within the thymus. They also cause a delayed impairment of neuromuscular transmission in vivo and are therefore believed to be the agent responsible for myasthenia gravis. (12 Dec 1998) |
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| thymoprival | Thymoprivicthymoprivous Relating to or marked by premature atrophy or removal of the thymus. Origin: thymus + L. Privus, deprived of (05 Mar 2000) |
| thymosin | <biochemistry> Peptide (28 amino acids) that restores aspects of immune function in vivo and in vitro. Possibly a thymic hormone. (18 Nov 1997) |
| thymosin _ 4 | Small protein (5 kD: 43 residues) found in large amounts in many vertebrate cells (approximately 0.2 mM in neutrophils) and that binds G actin thereby inhibiting polymerisation. (18 Nov 1997) |
| thymoxamine | <chemical> (2-(4-acetoxy-2-isopropyl-5-methylphenoxy)ethyl)dimethylamine. An alpha-adrenergic blocking agent that is used in raynaud's disease. It is also used locally in the eye to reverse the mydriasis caused by phenylephrine and other sympathomimetic agents. Pharmacological action: adrenergic alpha-antagonists, miotics, sympatholytics, vasodilator agents. Chemical name: Phenol, 4-(2-(dimethylamino)ethoxy)-2-methyl-5-(1-methylethyl)-, acetate (ester) (12 Dec 1998) |
| thymus | <anatomy> The lymphoid organ in which T lymphocytes are educated, mature and multiply. It is composed of stroma (thymic epithelium) and lymphocytes, almost entirely of the T-cell lineage. In mammals the thymus is just anterior to the heart within the rib cage, in other vertebrates in rather undefined regions of the neck or within the gill chamber in teleost fish. The thymus regresses as the animal matures. (18 Nov 1997) |
| thymus and parathyroids, hypoplasia of | See third and fourth pharyngeal pouch syndrome. (12 Dec 1998) |
| thymus derived lymphocyte | <haematology, immunology> A class of lymphocytes, so called because they are derived from the thymus and have been through thymic processing. Involved primarily in controlling cell-mediated immune reactions and in the control of B-cell development. The T-cells coordinate the immune system by secreting lymphokine hormones. There are 3 fundamentally different types of t cells : helper, killer, and suppressor. Each has many subdivisions. T-cells are also called t lymphocytes. They bear T-cell antigen receptors (CD3) and lack Fc or C3b receptors. Major T-cell subsets are CD4 (mainly helper cells) and CD8 (mostly cytotoxic or suppressor T-cells). Uncontrolled proliferation of this type of cell gives rise to T-cell leukaemia/lymphoma. (21 Jun 1999) |
| thymus extracts | Extracts of the thymus that contain specific, but uncharacterised factors or proteins with specific activities; three distinct substances are already known: thymotoxin, thymin and thymosin. (12 Dec 1998) |
| thymus gland | A bilaterally symmetric lymphoid organ situated in the anterior superior mediastinum. Each of its two lobes consists of an outer zone, the cortex, relatively rich in lymphocytes (thymocytes), and an inner zone, the medulla, relatively rich in epithelial cells. The thymus is the site of the production of T-lymphocytes. The thymus reaches its maximal development at about puberty and then undergoes a gradual process of involution resulting in a slow decline of immune function throughout adulthood. (12 Dec 1998) |
| thymus hormones | Humoral factors secreted by the thymus gland. They participate in the development of the lymphoid system and the maturation of the cellular immune response. (12 Dec 1998) |
| thymus hyperplasia | Enlargement of the thymus. A condition described in the late 1940's and 1950's as pathological thymic hypertrophy was status thymolymphaticus and was treated with radiotherapy. Unnecessary removal of the thymus was also practiced. It later became apparent that the thymus undergoes normal physiological hypertrophy, reaching a maximum at puberty and involuting thereafter. The concept of status thymolymphaticus has been abandoned. Thymus hyperplasia is present in two thirds of all patients with myasthenia gravis. (12 Dec 1998) |
| thymus treatment | Treatment of disease by administration of extracts of thymus gland. (05 Mar 2000) |
| thymus-dependent zone | <anatomy> Mid cortical region of lymph node, area that is particularly depleted of T lymphocytes in thymectomised animals and is referred to as the thymus dependent area. (18 Nov 1997) |
| thymus-independent antigen | An antigen that does not require T helper cell activation in order for the host's B-cells to be stimulated. Repeating polymers such as polysaccharides are examples of T-independent antigens. (05 Mar 2000) |
Synonyms : Hyperplasia, Thymus
Synonyms : Cancer of the Thymus, Neoplasms, Thymic, Neoplasms, Thymus, Thymic Cancer, Thymic Neoplasms, Thymic Tumors, Cancer, Thymic, Cancer, Thymus, Cancers, Thymic, Cancers, Thymus, Neoplasm, Thymic, Neoplasm, Thymus, Thymic Cancers, Thymic Neoplasm, Thymic Tumor
Synonyms : Thyme, Thymus vulgaris
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| thymus |
An immune system gland located at the base of the neck in young vertebrates; it tends to disappear or become nonfunctional in adults.
Ãâó: www.uoguelph.ca/GTI/urbanpst/glossn_z.htm
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| thymine |
A nitrogenous base, one of the four building blocks of the DNA double helix.
Ãâó: www.lsdn.com/glance_glossary.shtml
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| thymus |
a gland in the upper chest/lower neck where T cells develop, part of the immune system
Ãâó: www.chfpatients.com/glossary_2.htm
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| thyme |
(Thymus vulgaris), Family: Libiatae - A perennial plant with numerous procumbent stems, 6 to 12 inches high, covered with fine hair and pale brown bark. The leaves are small, opposite, sessile, and gray-green with slightly rolled edges. The small, blue-purple flowers are two-lipped and grow in dense, whorled clusters, blooming from May to September. Habitat: native to the Mediterranean region and widely cultivated in Europe and the United States. ...
Ãâó: www.springboard4health.com/notebook/dict_t.html
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| thymol |
a phenol, is a camphor extract found in oregano, arnica, damiana, and other plants. It is used to eradicate mold and plantanum parasites, to preserve anatomical specimens, and in embalming. Thymol has been used clinically as an agent against fungus, intestinal worms, parasites, jaw and lung tumors and athlete's foot. Pharmaceutically it is used as an antifungal agent.
Ãâó: www.springboard4health.com/notebook/dict_t.html
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