. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Amebic Dysentery 63s tion is quite different from that seen in Entamoeba coli, and only takes place when conditions are unfavorable to continued division. It is accomplished by a peculiar nuclear budding, by which chromatin granules or chronidia are pushed out from the nucleus toward the ectoplasm, where they develop into new nuclei, about which the cytoplasm collects until a distinct bud is formed and cast off as a small but distinct new organism—a spor
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Amebic Dysentery 63s tion is quite different from that seen in Entamoeba coli, and only takes place when conditions are unfavorable to continued division. It is accomplished by a peculiar nuclear budding, by which chromatin granules or chronidia are pushed out from the nucleus toward the ectoplasm, where they develop into new nuclei, about which the cytoplasm collects until a distinct bud is formed and cast off as a small but distinct new organism—a spore or bud. These when separated are round or oval, measure 3 to 6 /u in diameter, and are. Fig. 259.—Reproductive cycle of parasitic ameba (Wenyon). The small circle indicated by i, 2, 3, 3' and 3" indicated multiplication by schizogony or binary division. The large circle indicated by 1-12, the sporogeny or sexual cycle. The ameba having arrived at its full size (3) becomes encysted (4). The nu- cleus then divides into two (5), each half expels a small fragment of nuclear material (6), and when this has been effected, they conjugate (7) forming a synkaryon. The synkaryon then divides into two, into four, and then generally into eight (8-9-10-11-12) when the cyst ruptures, the spores are liber- ated (i) and both cycles are again started. surrounded by a yellowish envelope, which resists drying and the penetration of stains and chemicals. Craig gives a tabulation of the differential features of Entamoeba coli. Entamoeba histolytica, and Entamoeba tetragena (vide infra). 3. Entamoeba Tetragena (Viereck*).—This organism resembles Entamoeba histolytica more than Amoeba coU, but differs from it in the mode of reproduction, the sporocysts containing four instead of eight spores. * "Archiv. f. Schifis. u. Tropenhygiene," 1907, n, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1916
