Bacterium lactis
Lactic Lac"tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster]

{Lactic acid} (Physiol. Chem.), a sirupy, colorless fluid, soluble in water, with an intensely sour taste and strong acid reaction. There is one center of optical activity, and this results in the observation of three isomeric modifications all having the formula {C3H6O3}; one is dextrorotatory (L-lactic acid), the other levorotatory (D-lactic acid), and the third an optically inactive mixture of the first two (DL-lactic acid); chemically it is 2-hydroxypropanoic acid. {Sarcolactic acid} or {paralactic acid} occurs chiefly in dead muscle tissue, while {ordinary lactic acid} (DL-lactic acid) results from fermentation, such as the fermentation of milk by lactic acid bacteria. The two acids are alike in having the same constitution (expressed by the name {ethylidene lactic acid}), but the latter is optically inactive, while sarcolactic acid rotates the plane of polarization to the right. The third acid, ethylene lactic acid, accompanies sarcolactic acid in the juice of flesh, and is optically inactive.

{Lactic ferment}, an organized ferment ({Bacterium lacticum} or {Bacterium lactis}), which produces lactic fermentation, decomposing the sugar of milk into carbonic and lactic acids, the latter, of which renders the milk sour, and precipitates the casein, thus giving rise to the so-called spontaneous coagulation of milk.

{Lactic fermentation}. See under {Fermentation}. [1913 Webster +PJC]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Bacterium lactis — Fermentation Fer men*ta tion (f[ e]r m[e^]n*t[=a] sh[u^]n), n. [Cf. F. fermentation.] 1. The process of undergoing an effervescent change, as by the action of yeast; in a wider sense (Physiol. Chem.), the transformation of an organic substance… …   The Collaborative International Dictionary of English

  • Bacterium lactis — Zymogenic ym o*gen ic, a. (Biol.) (a) Pertaining to, or formed by, a zymogene. (b) Capable of producing a definite zymogen or ferment. [1913 Webster] {Zymogenic organism} (Biol.), a micro[ o]rganism, such as the yeast plant of the {Bacterium… …   The Collaborative International Dictionary of English

  • Bacterium lacticum — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • Lactococcus lactis — Taxobox color = lightgrey name = Lactococcus lactis image width = 250px image caption = regnum = Bacteria divisio = Firmicutes classis = Bacilli ordo = Lactobacillales familia = Streptococcaceae genus = Lactococcus species = L. lactis binomial =… …   Wikipedia

  • БРОЖЕНИЕ — БРОЖЕНИЕ, бурно идущее разложение органического вещества, вызываемое микроорганизмами, к рым этот процесс служит источником кинетич. энергии. Настоящие Б., в тесном смысле слова, не связаны с окислительными процессами за счет 02 атмосферы и… …   Большая медицинская энциклопедия

  • C3H6O3 — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • ethylidene lactic acid — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • Lactic — Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid} (Physiol.… …   The Collaborative International Dictionary of English

  • Lactic acid — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

  • Lactic ferment — Lactic Lac tic, a. [L. lac, lactis, milk: cf. F. lactique. See {Lacteal}, and cf. {Galactic}.] (Physiol. Chem.) Of or pertaining to milk; procured from sour milk or whey; as, lactic acid; lactic fermentation, etc. [1913 Webster] {Lactic acid}… …   The Collaborative International Dictionary of English

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”