pyrocitric |
<chemistry> Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic, itaconic, and mesaconic acid. Origin: Pyro- + citric: cf. F. Pyrocitrique. Source: Websters Dictionary (01 Mar 1998) |
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pyrococcus |
A genus of strictly anaerobic ultrathermophilic archaea, in the family thermococcaceae, occurring in heated seawaters. They exhibit heterotrophic growth at an optimum temperature of 100 degrees c. (12 Dec 1998) |
Pyrococcus sp GB-D DNA polymerase |
<enzyme> Thermophilic enzyme from the archaeon pyrococcus; used in pcr site-directed mutagenesis Registry number: EC 2.7.7.- Synonym: gb-d polymerase (26 Jun 1999) |
pyroelectric |
<physics> Pertaining to, or dependent on, pyroelectricity; receiving electric polarity when heated. Origin: Pyro- + electric. <physics> A substance which becomes electrically polar when heated, exhibiting opposite charges of statical electricity at two separate parts, especially the two extremities. Source: Websters Dictionary (01 Mar 1998) |
pyroelectricity |
<physics> Electricity developed by means of heat; the science which treats of electricity thus developed. Source: Websters Dictionary (01 Mar 1998) |
pyrogallate |
<chemistry> A salt of pyrogallic acid; an ether of pyrogallol. Source: Websters Dictionary (01 Mar 1998) |
pyrogallic |
<chemistry> Pertaining to, derived from, or designating, an acid called pyrogallol. See Pyrogallol. Origin: Pyro- + gallic. Source: Websters Dictionary (01 Mar 1998) |
pyrogallic acid |
<chemistry> A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes. Origin: Pyrogallic + -ol. Source: Websters Dictionary (01 Mar 1998) |
pyrogallol |
<chemistry> A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes. Origin: Pyrogallic + -ol. Source: Websters Dictionary (01 Mar 1998) |
pyrogallol-phloroglucinol isomerase |
<enzyme> Converts pyrogallol (1,2,3-benzentriol) to phloroglucinol (1,3,5-benzenetriol): also converts 1,2,4-benzenetriol to resorcinol plus 2,6-dihydroxyquinone Registry number: EC 5.4.99.- Synonym: p-p isomerase (26 Jun 1999) |
pyrogallolphthalein |
<chemistry> A red crystalline dyestuff, obtained by heating together pyrogallic and phthalic acids. Origin: Pyrogallol + phthalein. Source: Websters Dictionary (01 Mar 1998) |
pyrogen |
<cell biology> Substance or agent that produces fever. The major endogenous pyrogen in mammals is probably interleukin-1. (18 Nov 1997) |
pyrogenic |
<physiology> Fever inducing. Origin: Gr. Gennan = to produce (18 Nov 1997) |
pyrogens |
Substances capable of increasing body temperature; they may be of microbial origin, often polysaccharides and may contaminate distilled water. (12 Dec 1998) |
pyroglobulins |
Atypical gamma immunoglobulins characterised by their irreversible heat denaturation at 56-degrees c. Pyroprecipitation is inhibited at pH below 3 and above 9. The presence of pyroglobulins in the serum is the cause of pyroglobulinaemia. They are frequently present in multiple myeloma and the pyroglobulin precipitate binds complement, reacts with rheumatoid factor, produces passive cutaneous anaphylaxis, generalised passive anaphylaxis and passive arthus-type phenomena. (12 Dec 1998) |