anion exchange

an·i·on ex·change

(an'ī-on eks-chānj'), The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, nonmobile, positively charged phase, the latter being an anion exchanger. For example, the process takes place when Cl^- is exchanged for OH^- in desalting. The reaction is Cl^- (in solution) + (OH^- on anion exchanger⁺) → (Cl^- on anion exchanger) + OH^- (in solution); in combination with the cation exchange, NaCl is removed from solution. Anion exchange may also be used chromatographically, to separate anions, and, medicinally, to remove an anion (for example, Cl^-) from gastric contents or bile acids in the intestine.

an·i·on ex·change

(an'ī-on eks-chānj') The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, positively charged phase, the latter being an anion exchanger. Anion exchange may also be used chromatographically, to separate anions, and medicinally, to remove an anion (e.g., Cl^-) from gastric contents or bile acids in the intestine.

exchange

(eks-chanj') 1. To give up or substitute something for something else.2. In dietetics, the substitution of an equivalent amount of one food substance for another so that the caloric intake remains the same. Exchange diets are used frequently to help manage diabetes mellitus, and they have been adapted for use in proprietary weight loss programs. 3. In peritoneal dialysis, to drain fluid from the peritoneal cavity and replace it with fresh dialysate.

anion exchange

See: resin, ion-exchange

cation exchange

The transfer of cations between those in a liquid medium and those in a solid polymer. The polymer is termed the cation exchanger. Cation exchange is used in ion-exchange chromatography and in certain water purifiers.

food exchange

A grouping of commonly consumed foods according to similarities in composition so that the foods may be used interchangeably in diet planning.

sister chromatid exchange

The exchange of corresponding parts of homologous maternal and paternal chromosomes during the first meiotic division. This contributes to genetic diversity in the offspring. Synonym: crossing over

transcapillary exchange

The passage of substances between blood and tissue (interstitial) fluid.

单词	anion exchange
释义	anion exchange anion exchange n. A chemical process in which anions are exchanged equally between a solid and a solution. anion exchange anion exchange [′a‚nī·ən iks′chānj] (chemistry) A type of ion exchange in which the immobilized functional groups on the solid resin are positive. anion exchange an·i·on ex·change (an'ī-on eks-chānj'), The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, nonmobile, positively charged phase, the latter being an anion exchanger. For example, the process takes place when Cl^- is exchanged for OH^- in desalting. The reaction is Cl^- (in solution) + (OH^- on anion exchanger⁺) → (Cl^- on anion exchanger) + OH^- (in solution); in combination with the cation exchange, NaCl is removed from solution. Anion exchange may also be used chromatographically, to separate anions, and, medicinally, to remove an anion (for example, Cl^-) from gastric contents or bile acids in the intestine. an·i·on ex·change (an'ī-on eks-chānj') The process by which an anion in a mobile (liquid) phase exchanges with another anion previously bound to a solid, positively charged phase, the latter being an anion exchanger. Anion exchange may also be used chromatographically, to separate anions, and medicinally, to remove an anion (e.g., Cl^-) from gastric contents or bile acids in the intestine. exchange (eks-chanj') 1. To give up or substitute something for something else.2. In dietetics, the substitution of an equivalent amount of one food substance for another so that the caloric intake remains the same. Exchange diets are used frequently to help manage diabetes mellitus, and they have been adapted for use in proprietary weight loss programs. 3. In peritoneal dialysis, to drain fluid from the peritoneal cavity and replace it with fresh dialysate. anion exchange See: resin, ion-exchange cation exchange The transfer of cations between those in a liquid medium and those in a solid polymer. The polymer is termed the cation exchanger. Cation exchange is used in ion-exchange chromatography and in certain water purifiers. food exchange A grouping of commonly consumed foods according to similarities in composition so that the foods may be used interchangeably in diet planning. sister chromatid exchange The exchange of corresponding parts of homologous maternal and paternal chromosomes during the first meiotic division. This contributes to genetic diversity in the offspring. Synonym: crossing over transcapillary exchange The passage of substances between blood and tissue (interstitial) fluid. FinancialSeeexchangeThesaurusSeeion exchange
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