| performic acid | H-CO-O-OH;an organic peracid used in cleaving disulfide links in peptides by oxidizing cysteine and cystine to cysteic acid. Synonym: peroxyformic acid. (05 Mar 2000) |
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| performic acid reaction | Oxidative destruction of the ethylene double bond (-HC==CH-) which is converted to a Schiff-reactive double aldehyde; used to indicate the presence of unsaturated lipids, such as phospholipids and cerebrosides, as well as cystine-rich substances, such as keratin, in tissue sections. (05 Mar 2000) |
| mercaptoacetic acid | HSCH2COOH;used as a reagent for the detection of metals such as iron, molybdenum, silver, and tin; the ammonium and sodium salts are used in home permanents, the calcium salt as a depilatory. Synonym: mercaptoacetic acid. (05 Mar 2000) |
| mercapturic acid | A condensation product of l-cysteine with aromatic compounds, such as bromobenzene; formed biologically via glutathione in the liver and excreted in the urine; an S-substituted N-acetylated l-cysteine. Compare: mercapturic acid pathway. (05 Mar 2000) |
| mercapturic acid pathway | A glutathione-dependent pathway for the detoxification of a number of compounds, including arene oxides; an S-substituted glutathione is formed and ultimately converted to a mercapturic acid (an S-substituted N-acetylated l-cysteine), which is excreted; the leukotrienes are believed to be degraded through this pathway. (05 Mar 2000) |
| chenodeoxycholic acid | <chemical> A bile acid, usually conjugated with either glycine or taurine. It acts as a detergent to solubilise fats for intestinal absorption and is reabsorbed by the small intestine. It is used as cholagogue, a choleretic laxative, and to prevent or dissolve gallstones. Pharmacological action: cathartic, cholagogues and choleretics, gastrointestinal agents. Chemical name: Cholan-24-oic acid, 3,7-dihydroxy-, (3alpha,5beta,7alpha)- (12 Dec 1998) |
| periodic acid | <chemical> Periodic acid (h5io6). A strong oxidizing agent. Chemical name: Periodic acid (H5IO6) (12 Dec 1998) |
| periodic acid Schiff reaction | <technique> A histochemical technique based on periodic acid oxidation of a substance containing the 1,2-glycol grouping. It is used for staining carbohydrates as the resulting dialdehyde reacts with Schiff reagent to form a coloured product. The adjacent hydroxyl groups are oxidized to form aldehydes by periodic acid (HIO4) and these aldehyde groups react with Schiff's reagent (basic fuchsin decolourised by sulphurous acid) to give a purple colour. Acronym: PAS (18 Nov 1997) |
| periodic acid Schiff stain | <technique> A histochemical technique based on periodic acid oxidation of a substance containing the 1,2-glycol grouping. It is used for staining carbohydrates as the resulting dialdehyde reacts with Schiff reagent to form a coloured product. Substances that can be demonstrated include carbohydrates, mucins, cartilage matrix, collagen, reticulum, basement membranes, fibrin, thyroid colloid, amyloid, glomerular hyaline deposits, and a number of other secretions or tissue constituents. Also used in for staining gels on which glycoproteins have been run. See: periodic acid Schiff reaction Synonym: PAS stain. (22 Sep 2002) |
| rhodanic acid | HS-CN;hydrogen thiocyanate. Synonym: rhodanic acid, sulfocyanic acid. (05 Mar 2000) |
| chinic acid | <chemical> An acid which is found in cinchona bark and elsewhere in plants. Chemical name: Cyclohexanecarboxylic acid, 1,3,4,5-tetrahydroxy-, (1R-(1alpha,3alpha,4alpha,5beta))- (12 Dec 1998) |
| ribonucleic acid | <molecular biology> A nucleic acid found in all living cells. Plays a role in transferring information from DNA to the protein-forming system of the cell. (16 Dec 1997) |
| ribothymidylic acid | Ribothymidine 5'-phosphate;the ribose analog of thymidylic acid; a rare component of transfer RNAs. Acronym: TMP (05 Mar 2000) |
| chloracetic acid | An acetic acid in which one or more of the hydrogen atoms are replaced by chlorine. According to the number of atoms so displaced the acid is called monochloroacetic (chloroacetic; ClCH2COOH), dichloroacetic (Cl2CHCOOH), or trichloroacetic (Cl3CCOOH). Synonym: chloracetic acid. (05 Mar 2000) |
| ricinoleic acid | C18H34O3; [R -Z]-12-hydroxy-9-octadecenoic acid;an unsaturated hydroxy acid present in castor oil. (05 Mar 2000) |
| acidity |
All wines naturally contain acids, which should be in proper balance with fruit and other components. Sufficient acidity gives liveliness and crispness and is critical for wines to age.
출처: www.sallys-place.com/beverages/wine/wine_glossery....
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| acidic |
The condition of water or soil that contains a sufficient amount of acid substances to lower the pH below 7.0.
출처: www.e11th-hour.org/resources/backgrounders/environ...
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| acidic |
A sharp or tart taste in a wine, not necessarily indicating spoilage. All wines contain some acid; too little may leave the flavor flat or dull. Often, a young wine has a somewhat acid taste that diminishes or disappears during aging.
출처: www.recipegoldmine.com/kitchart/kitchart48.html
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| acid etching |
Acid etching is the selective dissolution of a surface (usually the tooth enamel) by a dilute acid. In the case of the tooth surface, this causes demineralisation of the enamel leaving a clean and more mechanically retentive surface layer, thereby improving the bonding to filling materials. The acid used is generally 30 to 50% Phosphoric acid.
출처: www.ddicenter.com/library/glossary.asp
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| acid rain |
Rain with a pH less than 5.
출처: www.visionlearning.com/library/pop_glossary_term.p...
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