| Tris | <abbreviation, chemical> Tris(hydroxymethyl)aminomethane and tris(hydroxymethyl)methylamine; used as a trivial name. (05 Mar 2000) |
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| tris- | <prefix> A chemical prefix indicating three of the substituents that follow, independently linked. Compare: tri-. (05 Mar 2000) |
| tris(hydroxymethyl)aminomethane | <chemical> An organic amine proton acceptor. It is used in the synthesis of surface-active agent and pharmaceuticals; as an emulsifying agent for cosmetic creams and lotions, mineral oil and paraffin wax emulsions, is a biological buffer, and is used as an alkaliser. Pharmacological action: buffers, excipient. Chemical name: 1,3-Propanediol, 2-amino-2-(hydroxymethyl)- (12 Dec 1998) |
| tris(hydroxymethyl)methylamine | <chemical> An organic amine proton acceptor. It is used in the synthesis of surface-active agent and pharmaceuticals; as an emulsifying agent for cosmetic creams and lotions, mineral oil and paraffin wax emulsions, is a biological buffer, and is used as an alkaliser. Pharmacological action: buffers, excipient. Chemical name: 1,3-Propanediol, 2-amino-2-(hydroxymethyl)- (12 Dec 1998) |
| buffer | <biochemistry, chemistry> A system that acts to minimise the change in concentration of a specific chemical species in solution against addition or depletion of this species. PH buffers: weak acids or weak bases in aqueous solution. The working range is given by pKa +/ 1. Metal ion buffers: a metal ion chelator for example EDTA, partially saturated by the metal ion acts, as a buffer for the metal ion. (18 Nov 1997) |
| buffer capacity | <chemistry> The ability of a buffer solution to absorb added alkali or acid while maintaining the solution's pH. (09 Oct 1997) |
| buffer index | The power of a substance in solution to absorb acid or alkali without change in pH; this is highest at a pH value equal to the pKa value of the acid of the buffer pair. See: buffer capacity. Synonym: buffer index. (05 Mar 2000) |
| buffer pair | An acid and its conjugate base (anion). (05 Mar 2000) |
| buffer value | The power of a substance in solution to absorb acid or alkali without change in pH; this is highest at a pH value equal to the pKa value of the acid of the buffer pair. See: buffer capacity. Synonym: buffer index. (05 Mar 2000) |
| buffer value of the blood | The ability of the blood to compensate for additions of acid or alkali without disturbance of the pH. (05 Mar 2000) |
| buffer zone | <ecology> An area of land separating two distinct land uses that acts to soften or mitigate the effects of one land use on the other. (09 Oct 1997) |
| riparian buffer | Riparian areas that are managed to protect the aquatic and riparian ecosystem. A riparian buffer protects water quality and temperature, habitat along the banks, upland habitat for aquatic and riparian species, and some or all of the floodplain. (05 Dec 1998) |
| secondary buffer | See: Hamburger's law. (05 Mar 2000) |
| dipolar buffer | Buffer whose structure can include opposite charges. Synonym: dipolar buffer. (05 Mar 2000) |
| zwitterionic buffer | Buffer whose structure can include opposite charges. Synonym: dipolar buffer. (05 Mar 2000) |