. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 402 PATHOGENIC MICROORGANISMS Tested for its power to form acid from sugars commonly used in differential tests, typhoid bacilli give the following reactions: Acid formation Dextrose + Levulose + Galactose + Mannit + Acid formation Maltose + Lactose — Saccharose — Dextrin + In the Hiss tube medium (see section on Media, page 133), the typhoid bacillus within eighteen to twenty-four hours produces an even clouding by virtue of its motility, but does not form gas. In contradis- tinction
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 402 PATHOGENIC MICROORGANISMS Tested for its power to form acid from sugars commonly used in differential tests, typhoid bacilli give the following reactions: Acid formation Dextrose + Levulose + Galactose + Mannit + Acid formation Maltose + Lactose — Saccharose — Dextrin + In the Hiss tube medium (see section on Media, page 133), the typhoid bacillus within eighteen to twenty-four hours produces an even clouding by virtue of its motility, but does not form gas. In contradis- tinction to this, dysentery bacilli grow only along the line of inocula-. FiG. 88.—Surface Colony op Bacillus typhosus on Gelatin. (After Heim.) tion, while bacilli of the colon group move in irregular sky-rocket-like figures away from the stab, at the same time breaking up the medium by the formation of gas-bubbles. Some actively motile colon bacilli cloud the medium, but the ruptures caused by the gas are always evident. The differentiation of the typhoid bacillus in pure culture from similar microorganisms by means of its growth upon media has been the sub- ject of many investigations. It is neither practicable nor desirable to enumerate all the various media which have been devised and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hiss, Philip Hanson, 1868-1913; Zinsser, Hans, 1878-1940. joint author. New York and London, D. Appleton and Company
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