Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . of sporulation, endo-sporous and arthrosporous. Endosporous.—First, a small granule develops in the pro-toplasm of a bacterium; this increases in size, or several httlegranules coalesce to form an elongated, highly refractive,and clearly defined object, rapidly attaining its real size, andthis is the spore. The remainder of the cell-contents has nowdisappeared, leaving the spore in a dark, very resistant mem-brane or capsule, and beyond this the weak cell-wall. The STRU
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . of sporulation, endo-sporous and arthrosporous. Endosporous.—First, a small granule develops in the pro-toplasm of a bacterium; this increases in size, or several httlegranules coalesce to form an elongated, highly refractive,and clearly defined object, rapidly attaining its real size, andthis is the spore. The remainder of the cell-contents has nowdisappeared, leaving the spore in a dark, very resistant mem-brane or capsule, and beyond this the weak cell-wall. The STRUCTURE AND DEVELOPMENT OF BACTERIA 25 cell-wall dissolves gradually or stretches and allows the sporeto be set free. Each bacterium gives rise to but one spore. It may be ateither end or in the middle (Fig. 4). Some rods take on apeculiar shape at the site of the spore, making the rod looklike a drum-stick or spindle—clostridiima (Fig. 5). Spore Contents.—What the real contents of spores are isnot known. In the mother-cell at the site of the spore littlegranules have been found which stain differently from the rest. Fig. 4.—Sporulation (after De Bary).
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1913
