T cells Lymphoid cells from the bone marrow that migrate to the thymus gland, where they develop into mature differentiated lymphocytes that migrate between the blood and lymph. Mature T cells are antigen specific i.e. each responds to different antigens.
T lymphocytes See T cells.
Tachycardia Abnormal rapid heartbeat.
Talin A sweet-tasting protein extracted from Thaumatococcus danielli, approximately 100,000 times sweeter than sucrose. Also known as Thaumatin.
Technetium-99m (99mTc) A gamma emitting radioisotope with a half-life of 6 h. Used as a diagnostic agent for diagnostic gamma imaging. It is also used in research to follow the behaviour of formulations in the body. It can be complexed in many ways e.g. with diethylenetriaminepentaacetic acid (DTPA), hexakis (t-butyl isonitrile), hexamethyl-propyleneamine oxidase, HIDA or with tannous phytate.
Teflon (polytetrafluorethylene) A white thermoplastic material with a waxy texture. It is non-flammable, resists chemical action and radiation and has a low coefficient of friction.
Terbutaline A synthetic sympathomimetic anime used for treating asthma.
Terpenes Any member of the family of hydrocarbons with the formula C10H16. There are found in the essential oil of many plants especially conifers.
Testosterone Androgen produced by the testes. The hormone is also produced by the adrenal cortex in both males and females.
Tetracyclines Broad spectrum antibiotics.
Tetrahydrozoline A vasoconstrictor used as a nasal decongestant.
Thermogram A graphic record of variation in the amount of heat required to cause a change in temperature; the heat capacity as a function of temperature.
Thermophoresis The movement of small particles toward a warm surface as a result of differences indiffusion rate.
Thiomersal An organomercurial used as a pharmaceutical antibacterial and preservative.
Thrombosis Formation, development of existence of a blood clot or thrombus. Life-saving during haemorrhage, but life threatening if it occurs at any other time since it can occlude blood supply to a vessel.
Thymidine A nucleoside present in deoxyribonucleotide.
Timolol A 6 adrenergic blocking drug.
Titanium dioxide Used to protect the skin from the sun.
Total parenteral nutrition (TPN) Intravenous nutrition which provides total nourishment to a patient.
Tragacanth Dried gum exuded from the plant Astragalus gummifer. Used as a mucilage for greaseless lubrication and as an application for chapped skin.
Transferrin Blood globulin which binds and transports iron.
Transfersomes Liposomes made from a blend of phospholipids which have a high degree of flexibility, allowing them to pass through small gaps in the lipid structure of the epithelium.
Transition temperature (lipids) The temperature at which a phospholipid bilayer undergoes a phase transition from an ordered to a disordered state.
Transitional epithelium Epithelium which shows a gradation in type at the boundary between different organs, for example between the oesophagus and the stomach.
Tributyrase An enzyme which hydrolyses tributyrin to glycerol and butyric acid.
Triceps muscle Extends forearm and arm.
Tricyclic antidepressants Drugs used to treat moderate to severe endogenous depression.
Trypsin Proteolytic enzyme formed in the intestine.
Trypsinogen Proenzyme of inactive form of trypsin.
Tuberculin A soluble cell substance prepared from the tubercle bacillus used to determine the presence of a tuberculosis infection.
Tuft cells An intestinal epithelial cell of uncertain function.
Turbinates Bones which project from the lateral nasal wall.
Tween Trade name for a family of hydrophilic surfactants produced by conjugating ethylene oxide and fatty acids to a sorbitol nucleus.
Tyrosine An amino acid.
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