. Protozoo?logy. Protozoa; Protozoa, Pathogenic. "--5. .##,. Autogamy in Entameba (ameba) muris. (After Wenyon.) A, ordinary ameboid form with nucleus in process of division; B, ordinary individual encysted and with one nucleus; C nucleus divided; D, chromatin has passed into cytoplasm, leaving no definite nuclei in the cyst; E, two small nuclei reformed from the scattered chromatin, other chromatin residue and food remains are being voided; F, two nuclei and so-called "reduction" bodies remaining in cyst; G, a cyst with two spindles, food remains, and some waste chromatin; the
. Protozoo?logy. Protozoa; Protozoa, Pathogenic. "--5. .##,. Autogamy in Entameba (ameba) muris. (After Wenyon.) A, ordinary ameboid form with nucleus in process of division; B, ordinary individual encysted and with one nucleus; C nucleus divided; D, chromatin has passed into cytoplasm, leaving no definite nuclei in the cyst; E, two small nuclei reformed from the scattered chromatin, other chromatin residue and food remains are being voided; F, two nuclei and so-called "reduction" bodies remaining in cyst; G, a cyst with two spindles, food remains, and some waste chromatin; the two spindles give rise to four nuclei which conjugate two and two; H, cyst with two recently conjugated nuclei which next divide to form four (/) and finally eight (7) spore nuclei. corresponding stages may be illustrated by Wenyon's figures of E. muris. Here and in E. coli the organisms encyst after a period in the intestine; the nucleus of the encysted cell divides (Fig. 59, A, B, C) and the cell body indicates a corresponding division into two parts, but the connections between these parts is never lost, and we are thus dealing at the beginning of fertilization with a binucleated cell. The nuclei next fragment, forming idiochromidia, from which two much smaller nuclei (D, E) are formed by segregation of the scattered granules. Each nucleus then divides twice, one-half of each division forming nuclei which degenerate in the cell (reduction nuclei) and two. 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York and Philadelphia, Lea & Febiger
Size: 2702px × 925px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkandphiladel
