| TAC | tachykinin; terminal antrum contraction; tetracaine, adrenalin, and cocaine; time-activity curve; to... |
|---|---|
| TAH | total abdominal hysterectomy; total artificial heart |
| TAN | total adenine nucleotide; total ammonia nitrogen |
| TBC | thyroxine-binding coagulin; total body calcium; total body clearance; tuberculosis |
| TBW | total body water; total body weight |
| total refractory period | The absolute refractory period plus the relative refractory period. (05 Mar 2000) |
|---|---|
| total sclerectasia | Uniform stretching of the entire sclera, typically seen in buphthalmos. (05 Mar 2000) |
| total spinal anaesthesia | Spinal anaesthesia extensive enough to produce loss of sensation in all extracranial sensory roots. (05 Mar 2000) |
| total suspended particulates | The quantity of solid particles in a gas or exhaust stream. Any finely divided material (solid or liquid) that is airborne with a diameter smaller than a few hundred micrometres. (05 Dec 1998) |
| total suspended solids | The organic and inorganic material left on a standard glass fibre filter (0.45 micron) after a water sample is filtered through it. (09 Oct 1997) |
| total synechia | Adhesion of the entire surface of the iris to the lens capsule. (05 Mar 2000) |
| total transfusion | Removal of most of a patient's blood followed by introduction of an equal amount from donors. Synonym: exsanguination transfusion, substitution transfusion, total transfusion. (05 Mar 2000) |
| activation energy | <chemistry> The amount of energy (expressed in joules) that is needed to convert all the molecules in one mole of a reacting substance from a ground state to the transition state. (06 May 1997) |
| binding energy | <chemistry, radiobiology> The binding energy of a nucleus is the minimum energy required to dissociate it into its component neutrons and protons. Neutron or proton binding energies are those required to remove a neutron or proton, respectively, from a nucleus. Electron binding energy is that required to remove an electron from an atom or a molecule. (16 Dec 1997) |
| bioelectric energy sources | Implantable devices which convert biological energy (chemical energy of the metabolism of continuously regenerating body fluids or mechanical energy of periodic movements) to electrical energy. The sources include biogalvanic cells, biofuel cells, and ionic concentration cells. (12 Dec 1998) |
| biomass energy | See Bioenergy. (05 Dec 1998) |
| bond dissociation energy | This is the energy needed to break the bonds between two linked atoms. (09 Oct 1997) |
| bond energy | The energy needed to break a molecular bond. (09 Oct 1997) |
| radiant energy | Energy contained in light rays or any other form of radiation. (05 Mar 2000) |
| radiography, dual-energy scanned projection | A method of producing a high-quality scan by digitizing and subtracting the images produced by high- and low-energy X-rays. (12 Dec 1998) |