| NAA | N-acetyl aspartate; naphthaleneacetic acid; neutral amino acid; neutron activation analysis; neutrop... |
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| TCA | T-cell A locus; terminal cancer; tetracyclic antidepressant; total cholic acid; total circulating al... |
| TPA | tannic acid, polyphosphomolybdic acid, and amino acid; 12-0-tetradecanoyl-phorbol-13-acetate; third-... |
| UA | absorption unsharpness; ultra-audible; ultrasonic arteriography; umbilical artery; unauthorized abse... |
| PAS | 1) Periodic Acid-Schiff Stain 2) Para-Amino-Salicyclic Acid &nbs... |
| acid-citrate-dextrose | A citrate anticoagulant used for the collection and preservation of whole blood. It has largely been replaced by newer coagulants (CPD, Adsol) that allow for longer shelf life for blood and blood products. Acronym: ACD (05 Mar 2000) |
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| acid deoxyribonuclease | An endonuclease that cleaves both strands of native DNA (as well as single-stranded DNA) to produce a mixture of oligodeoxynucleotides, each ending in a 3'-phosphate. Synonym: acid deoxyribonuclease. (05 Mar 2000) |
| acid dextran | The product of acid and heat treatment of dextran. (05 Mar 2000) |
| acid dextrin | The product of acid and heat treatment of dextrin. (05 Mar 2000) |
| acid dissociation constant | <chemistry> This is the equilibrium constant for the breaking apart of a weak acid into its hydrogen and conjugate base in a water solution. (09 Oct 1997) |
| acid dyspepsia | Dyspepsia associated with excess gastric acidity. (05 Mar 2000) |
| acid etch | <dentistry> A procedure where a weak acid smeared on your teeth to ready your teeth for brackets. The acid etch helps your brackets stay on better. (08 Jan 1998) |
| acid etch cemented splint | A splint of heavy wire which is cemented to the labial surfaces of teeth with any of the acid etch cement techniques; used to stabilise traumatically displaced or periodontally diseased teeth. (05 Mar 2000) |
| acid-etched restoration | The restoration of tooth structure with a resin after the surface of the tooth has been treated with an acid solution that etches the tooth surface, thereby increasing retention of the restoration. (05 Mar 2000) |
| acid etching, dental | Pretreatment of tooth surfaces with etching agents, usually phosphoric acid, to increase the adhesion of various resin systems. (12 Dec 1998) |
| acid-fast | <microbiology> A term used to denote bacteria that are not decolorised by acid-alcohol after having been stained with dyes such as basic fuchsin. The presence of acid fast organisms can be found in cultures that contain mycobacteria or some of the nocardiae. (12 Jul 2000) |
| acid-fast stain | <technique> A staining technique used to determine the cell wall property of a microorganism. After stained with dye such as hot carbolfuschin, an acid-fast organism, (for example Mycobacterium species) will retain the colour in its cell wall after being washed with acid-alcohol. (13 Nov 1997) |
| acid fuchsin | A mixture of the sodium salts bi-and trisulfonic acids of rosanilin and pararosanilin; used as an indicator dye and for staining of cytoplasm and collagen. Synonym: rubin S, rubine. (05 Mar 2000) |
| acid gland | One of the gastric gland's secreting the hydrochloric acid of the gastric juice. Synonym: oxyntic gland. (05 Mar 2000) |
| acid hydrolysis | A chemical process in which acid is used to convert cellulose or starch to sugar. (05 Dec 1998) |