. The cytology and life-history of bacteria. Bacteria. CYTOLOGY LIFE-HISTORY BACTERIA. Miss PInlhs E Pease) Figs, .'ui and .")4- THE LIFE-CYCLE OF CAULOBACTER The life-cycle of the true, stalked caulobacteria provides an example of the alternation of sessile and motile generations, such as is commonly found in other biological groups. In Fig. 53 the entire cycle is seen foreshortened. The stalked cell is producing a flagellate daughter cell. Fig. 54 shows the complete life-cycle. The stalked generation (1) is shown in process of division. In (2) the flagellate daughter cell is shown. In (
. The cytology and life-history of bacteria. Bacteria. CYTOLOGY LIFE-HISTORY BACTERIA. Miss PInlhs E Pease) Figs, .'ui and .")4- THE LIFE-CYCLE OF CAULOBACTER The life-cycle of the true, stalked caulobacteria provides an example of the alternation of sessile and motile generations, such as is commonly found in other biological groups. In Fig. 53 the entire cycle is seen foreshortened. The stalked cell is producing a flagellate daughter cell. Fig. 54 shows the complete life-cycle. The stalked generation (1) is shown in process of division. In (2) the flagellate daughter cell is shown. In (3) are two flagellate cells in the process of becoming sessile. In the upper example the stalk has already developed, but the flagellum (slightly outhned for clarity) is retained. In the lower example the stalk is in an early stage of development. Electron micrographs, gold-shadowed. Fig. 53 and Fig. 54 (1) X 20,000; Fig. 54 (2), (3) â 15,000. for reproductive purposes. Chlamydobacteria are aquatic and instead o£ aerial spores produce motile swariner cells, which swim actively by means of flagclla. The vegetative cells grow as a long filament, surrounded by a sheath o£ colloidal iron. At the ends of the sheath the cells may be transformed into flagellated swarmers, which swim oft' to found new filamentous 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 Bisset, Kenneth Alexander. Baltimore : Williams and Wilkens
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectbacteria
