. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. Pig. 196.—Proteosoma prcecox in the blood of a field lark (Glauda arvensis). A, Young parasite in a blood cell. B, Half-grown parasite which has pushed aside the nucleus of the erjrthrocyte. C, Parasite with clump of pigment and many nuclei. The nucleus of. the erythrocyte has been lost (uncommon). D, Division into eight- een merozoits. (From Doflein after Wasielewski.) cycle, which may be repeated many times. After a time so
. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. Pig. 196.—Proteosoma prcecox in the blood of a field lark (Glauda arvensis). A, Young parasite in a blood cell. B, Half-grown parasite which has pushed aside the nucleus of the erjrthrocyte. C, Parasite with clump of pigment and many nuclei. The nucleus of. the erythrocyte has been lost (uncommon). D, Division into eight- een merozoits. (From Doflein after Wasielewski.) cycle, which may be repeated many times. After a time some of the growing parasites become differentiated to form macro- gametocytes and microgametocytes, which are kidney-shaped and do not divide nor undergo further development in the vertebrate host. When the blood is drawn and diluted with citrated salt so-. FlG. 197.—Midgut of a culex mosquito, covered with oocyts of Proteosoma prcecox. V, Vasa malpighii. (From Doflein after Ross.) lution, or taken in by a mosquito, four to eight microgametes are formed just as has been described for H. columbce. They are very slender actively motile spindles without flagella. Fertilization of the macrogamete and the production of an ookinete takes place in the usual manner. The latter penetrates the intestinal epithelium of thfe mosquito (Culex sp.) and enlarges to produce. 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 MacNeal, Ward J. , 1881-1946; Williams, Herbert Upham, 1866-. Philadelphia, P. Blakiston's Son & Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteri, bookyear1920
