. Laboratory work in bacteriology. Bacteriology. 50 BACTEKIOLOGY. marked and characteristic forms result. Thus, in the case of a median spore a marked enlargement of the central portion of the cell gives rise to a spindle-shaped form which is known as a Clostridium (Fig. 13 a 2). When the spore is terminal, a corresponding spherical enlargement of the end gives rise to what is known as the " drumstick"' bacillus (Pig. 13 c 2).. Fig. 13. Position of spores; .resultant forms (diagrammatic). a—Median spores; 6—Intermediate spores; dr—Terminal spores: 2 rt, ^,c—Change in form of cell due
. Laboratory work in bacteriology. Bacteriology. 50 BACTEKIOLOGY. marked and characteristic forms result. Thus, in the case of a median spore a marked enlargement of the central portion of the cell gives rise to a spindle-shaped form which is known as a Clostridium (Fig. 13 a 2). When the spore is terminal, a corresponding spherical enlargement of the end gives rise to what is known as the " drumstick"' bacillus (Pig. 13 c 2).. Fig. 13. Position of spores; .resultant forms (diagrammatic). a—Median spores; 6—Intermediate spores; dr—Terminal spores: 2 rt, ^,c—Change in form of cell due to the presence of the spore; 2 a—Clostridium; 2 c—" Drum-stick " form. In the case of motile bacteria spore production is usually accompanied by a loss of motion. This is especially true of the aerobic species. On the other hand the anaero- bic bacteria may-continue to move about for some time after the spore has fully developed. Flagella can be 'demonstrated on these motile spore-bearing rods. The persistence of motion in such cases may be due to the remnant of protoplasm which is left outside of the spore and which lines the cell wall. Spore formation has been supposed to take place when- ever the culture medium became exhausted. This view, however, can be easily shown to be incorrect. The nour- ishing material of the soil is by no means consumed when a given organism begins to form spores. There may be times, however, when this factor may come into play. Under the artificial conditions of the laboratory it is more likely that the accumulation of the waste-products of the organism and the action of these products on the living cell cause it to pass into the spore form. As long as the. 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 Novy, Frederick George, 1864- . Ann Arbor [Mich. ]
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