. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CH. X.—MORPHOLOGY OF THE BACTERIA.—ARTHROSPOROUS BACTERIA. 471 Beggiatoa alba (Figs. 197,198) forms filaments which in an intact state are attached in an erect position to fixed objects in dirty water, in water discharged from factories, and in hot sulphur springs. The filaments vary in thickness from i to more than 5 fi, and consist of a single row of cells, the protoplasm of which con- tains granules of sulphur in quantities dififering in each cell (see page 455); w
. Comparative morphology and biology of the fungi, mycetozoa and bacteria . Plant morphology; Fungi; Myxomycetes; Bacteriology. CH. X.—MORPHOLOGY OF THE BACTERIA.—ARTHROSPOROUS BACTERIA. 471 Beggiatoa alba (Figs. 197,198) forms filaments which in an intact state are attached in an erect position to fixed objects in dirty water, in water discharged from factories, and in hot sulphur springs. The filaments vary in thickness from i to more than 5 fi, and consist of a single row of cells, the protoplasm of which con- tains granules of sulphur in quantities dififering in each cell (see page 455); when the sulphur is very abundant it may be diffi- cult to perceive the boun- daries between the cells. The filaments have no separate common sheath and readily divide trans- versely into pieces. Their cells pass successively from the lengthened rod- form into the isodiametric form, and these in the case of the thicker fila- mentsinto flat discswhich finally divide by longitu- dinal walls into four quad- rants (Fig. 127, 6-8). The disc-like cells as well as the isodiametric members of the slender filaments separate after a time from one another (Fig. 197, 9) and round themselves oflf, and then become active swarm- cells (Fig. 197, 10); at lengfth they come to rest and attach themselves to fixed objects. They mul- tiply abundantly by bi- partition and form irregu- larly-shaped zoogloea-heaps. They may also develope into rods and these again into the filaments above described after the rods have in many cases themselves passed through the swarming-state. In this species also spirally twisted filaments are found as well as the straight ones which we have been hitherto considering,. FIG. 197. Beggiatoa alba, i group of attached filaments, s—s portions of filaments of different stoutness, 5 in the act of breaking up into fragments. The small dark circles in the interior are granules of sulphur; in the parts of the filaments where the granules are abundant the transverse segment
Size: 1182px × 2113px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisheroxfor, bookyear1887
