. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 157.- -Baoillus aerogenes capsulatus. 1, bacilli; S, spores; 3, culture in dextrose-nutrient agar. » Biology.—Anaerobic, non-motile, non-liquefying bacilli. They arepositive to Gram, but are more easily decolorized than many bacteria.Growth is rapid at 37° C, in the usual culture media in the absence ofoxygen, and is accompanied by the production of gas. Nutrient gelatinis not liquefied, but it is gradually peptonized. On agar colonies aredeveloped which are from 1 to 2 mm. or more in diameter
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. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 157.- -Baoillus aerogenes capsulatus. 1, bacilli; S, spores; 3, culture in dextrose-nutrient agar. » Biology.—Anaerobic, non-motile, non-liquefying bacilli. They arepositive to Gram, but are more easily decolorized than many bacteria.Growth is rapid at 37° C, in the usual culture media in the absence ofoxygen, and is accompanied by the production of gas. Nutrient gelatinis not liquefied, but it is gradually peptonized. On agar colonies aredeveloped which are from 1 to 2 mm. or more in diameter, grayish-whitein color, and in the form of flattened spheres, ovals, or irregular masses, covered with hair-like projections. Bouillon is diffusely clouded, and awhite sediment is formed. Milk becomes acidified and coagulated, thenpartially digested, giving a worm-eaten appearance to the clot. Alarge amount of butyric acid is produced. Isolation.—When quantities up to 2.5 c.c. of fresh bouillon culturesare injected into the circulation of rabbits and the animals killed shortlyafter the