. Agricultural bacteriology. Bacteriology, Agricultural. 94 BACTERIAL METABOLISM PRODUCTS and other solvents. The pigment produced by Azotobacter chroo- coccum is insoluble in all of these solvents but dissolves in alkalies undergoing decomposition with the formation of a dark brown solution. Heat. —Probably all bacteria liberate energy as heat in their metabolic process and there are a number which liberate it in suffi- cient amount perceptibly to change the temperature of the media in which they grow. This is exemplified in the heating of fermenting silage, manure, and hay. At times the temp
. Agricultural bacteriology. Bacteriology, Agricultural. 94 BACTERIAL METABOLISM PRODUCTS and other solvents. The pigment produced by Azotobacter chroo- coccum is insoluble in all of these solvents but dissolves in alkalies undergoing decomposition with the formation of a dark brown solution. Heat. —Probably all bacteria liberate energy as heat in their metabolic process and there are a number which liberate it in suffi- cient amount perceptibly to change the temperature of the media in which they grow. This is exemplified in the heating of fermenting silage, manure, and hay. At times the temperature is raised to the kindling point with the result that spontaneous combustion may occur in hay and grain stacks. Bacteria generate considerable of the heat, but other chemical processes are also FIG. 14.—Photogenic bacteria colonies on a plate photographed by means of their own light. (Lafar.) (Buchanan's Household Bacteriology.) Light.—Sometimes one sees on the surface of decaying wood, fish, or various meats a bright illuminated surface which at times may be sufficient for the photographing of objects in an otherwise dark room. This is due to the growth of certain light-producing bacteria. Other organisms produce a beautiful phosphorescence. The organisms producing light are especially prone to occur in saline waters and are invariably aerobes. REFERENCES. Marshall: Microlxiology. Taylor: Digestion and Metabolism. Lafar: Technical Mycology. Kendall: Bacteriology—General, Pathological 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 Greaves, J. E. (Joseph Eames), b. 1880. Philadelphia New York, Lea & Febiger
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