Abel's laboratory handbook of bacteriology / [Rudolf Abel].
- Abel, Rudolf Velentine Ludwig, 1868-
- Date:
- [1912?]
Licence: In copyright
Credit: Abel's laboratory handbook of bacteriology / [Rudolf Abel]. Source: Wellcome Collection.
Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.
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![Staphylococcus pyogenes. Luxuriant colonies with sharp margins. Gonococci. Small opaque colonies. Pneumococci. Small opaque colonies. [It has recently been shown that both Streptococci and Staphylococci can readily be differentiated inle) se by their biochemical reactions.] Differentiation of Streptococci. (Gordon, L.G.B., 1902-3, 1903-4; Houston, ih. 1903-4, 1904-5, also Report to L.C.C. on milk standards 1905; Gordon, Report on Ventilation of House of Commons 1906 ; Andrewes and Horder, Lancet, Sept. 1906.) The tests of value for differentiating streptococci are:—(1) the production of clot in litmus milk at 37° C.; (2) the production of green Huorescence in neutral red broth during incubation for 2 days anaerobically at 37° C. ; (3) the production of an acid reaction when cultivated for 3 days aerobically at 37° C. in slightly alkaline Lemco fluid containing 1 % saccharose; (4) ditto, but lactose ; (5) ditto, but raffinose ; (6) ditto, but inulin ; (7) ditto, but salicin ; (8) ditto, but coniferin ; (9) ditto, but mannite. The Lemco medium (Houston) in which the sub- stances used in tests 4-9 are dissolved consists ot distilled water containing Lemco 1 %, peptone 1 %, sodium bicarbonate 0-1 %, and it is tinted with litmus. Reactions of some of the chief types of Streptococcus (Andrewes and Horder, Lancet, Sept. 1906):—](https://iiif.wellcomecollection.org/image/b21509645_0168.jp2/full/800%2C/0/default.jpg)
