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  2. Beta-galactoside permease - Wikipedia

    en.wikipedia.org/wiki/Beta-galactoside_permease

    Early studies by Hiroshi Nikaido in 1962 suggest a direct relationship between the amount of beta-galactoside permease activity in a cell and the turnover rate of phospholipids in E. coli. In his experiments with gram-positive and gram-negative bacterial cells under varying conditions, the level of P 32 in phospholipids was found to be ...

  3. Coliform bacteria - Wikipedia

    en.wikipedia.org/wiki/Coliform_bacteria

    Escherichia coli (E. coli) can be distinguished from most other coliforms by its ability to ferment lactose at 44 °C in the fecal coliform test, and by its growth and color reaction on certain types of culture media. When cultured on an eosin methylene blue (EMB) plate, a positive result for E. coli is metallic green colonies on a dark purple ...

  4. Lactase - Wikipedia

    en.wikipedia.org/wiki/Lactase

    While the details of the mechanism are uncertain, the stereochemical retention is achieved off a double displacement reaction. Studies of E. coli lactase have proposed that hydrolysis is initiated when a glutamate nucleophile on the enzyme attacks from the axial side of the galactosyl carbon in the β-glycosidic bond. [16]

  5. Vaginal flora - Wikipedia

    en.wikipedia.org/wiki/Vaginal_flora

    [26] [44] Several studies have demonstrated that a significant proportion (7–33%) of healthy asymptomatic women (especially black and Hispanic women) [45] lack appreciable numbers of Lactobacillus species in the vagina, [33] [46] and instead have a vaginal microbiota that consist of other lactic acid-producing bacteria, i.e. species from the ...

  6. lac operon - Wikipedia

    en.wikipedia.org/wiki/Lac_operon

    The lactose operon (lac operon) is an operon required for the transport and metabolism of lactose in E. coli and many other enteric bacteria.Although glucose is the preferred carbon source for most enteric bacteria, the lac operon allows for the effective digestion of lactose when glucose is not available through the activity of β-galactosidase. [1]

  7. Pathogenic Escherichia coli - Wikipedia

    en.wikipedia.org/wiki/Pathogenic_Escherichia_coli

    Escherichia coli (/ ˌ ɛ ʃ ə ˈ r ɪ k i ə ˈ k oʊ l aɪ / ESH-ə-RIK-ee-ə KOH-ly; commonly abbreviated E. coli) is a gram-negative, rod-shaped bacterium that is commonly found in the lower intestine of warm-blooded organisms (endotherms).

  8. Fecal pH test - Wikipedia

    en.wikipedia.org/wiki/Fecal_pH_test

    [1] [2] A lower faecal pH (very acidic stool) can indicate a digestive problem such poor absorption of carbohydrates or fats, [3] lactose intolerance, [4] an infection such as E. coli or rotavirus, or overgrowth of acid-producing bacteria (such as lactic acid bacteria).

  9. Escherichia coli - Wikipedia

    en.wikipedia.org/wiki/Escherichia_coli

    E. coli is a gram-negative, facultative anaerobe, nonsporulating coliform bacterium. [18] Cells are typically rod-shaped, and are about 2.0 μm long and 0.25–1.0 μm in diameter, with a cell volume of 0.6–0.7 μm 3. [19] [20] [21] E. coli stains gram-negative because its cell wall is composed of a thin peptidoglycan layer and an