. Les micro-organismes pathogènes. Un texte-livre de microbiologie pour les médecins et les étudiants en médecine. (D'après Williams' bactériologie). Bactériologie ; les bactéries pathogènes. 424 MICRO-ORGANISMES SPÉCIFIQUES D'autres individus. La cellule est de 8 à 60/j de diamètre. L'ecto- plasm est nettement différenciée de l'endoplasme même lorsque la cellule est immobile, et le lobose pseudopodes sont composées entièrement de la difficulté d'ectoplasme hautement réfractif. Endopla l'fem contient des bactéries alimentaires composées de fragments de cellules, et des globules rouges. Le noyau est très nettement visible dans le salon ameba

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. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. 424 SPECIFIC MICRO-ORGANISMS Other individuals. The cell is 8 to 60/i in diameter. The ecto- plasm is distinctly differentiated from the endoplasm even when the cell is motionless, and the lobose pseudopodia are made up entirely of the stiff highly refractive ectoplasm. _The endopla'fem contains food material consisting of bacteria, cell fragments and red blood cells. The nucleus is very distinctly visible in the living ameba. It is spherical and surrounded by a-thick doubly, contoured nuclear membrane. The chromatin is usually dis- tributed just beneath the nuclear membrane in largest amount and in the center there is a karyosome with definite centriole. The vege- tative multiplication takes place by division into two daughter cells. Multiple division seems not to occur. Pig. 184.—Enda- ^ , . , , i rri i. mceba dysenteria. Lyst formation IS rarely observcd. 1 he cysts 5ntgfoTfnuTeI ^re most likely to be found when the stool be- and a mass of chro- comes formed ill convalcsccncc from an attack of midial substance. i . , i . i ^i -u {After Hartmann.) dysentery and they may then be very numer- * ous. The mature cyst contains four nuclei, , and frequently contains also one or more large masses of chromidial substance which stain black with iron hematoxylin. The forms of the organism commonly observed in the feces of dysentery are either the active vegetative cells^ or degenerating forms, and the latter may lead to confusion unless their true nature is recognized. The belief that amebae bear a causal relation to dysentery is based upon the fact that certain types of amebae, E. dysmtericB (E. Mstolyiica) are found in the stools, as a rule, only in cases of dysentery; further, that these cases of dysentery, in which these amebae occur, are characterized by definite clinical signs and typical anatomical

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• bookcentury1900
• bookdecade1920
• booksubjectbacteri
• bookyear1920