. Un texte-livre sur les protozoaires et les bactéries pathogènes pour les étudiants de médecine et les médecins. Bactériologie ; bactéries pathogènes ; les protozoaires. Les protozoaires 47 rempli d'innombrables chambres dans lesquelles ses enzymes et d'autres substances actives, etc., sont stockées et les fonctions exercées. En plus de ces chambres, qui sont des minutes et de taille uniforme, il y a des espaces plus grands appelés vacuoles, dont certaines sont le résultat de conditions temporaires-accumulations d'digéré mais pas encore assimilé l'alimentation, etc., mais d'autres, vu dans et dans l'ameba ciliata, sont grandes, permanent, et qui se caractérise par

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. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. The Protozoa 47 filled with endless chambers in which its enzymes and other active substances, etc., are stored up and its functions carried on. In addition to these chambers, which are minute and of uniform size, there are larger spaces called vacuoles, some of which are the result of temporary conditions—accumulations of digested but not yet assimilated food, etc.; but others, seen in ameba and in the ciliata, are large, permanent, and characterized by rhythmical contractions through which they disappear from one part of the body substance to appear in another. These are known as "con- tractile vacuoles, " and are supposed to subserve the useful purpose of assisting in maintaining cytoplasmic currents and so distributing the nourishing juices. The cytoplasm also contains remnants of undigested or indigest- ible foods which constitute the paraplasm or deuteroplasm. In a. Fig. 15.—Internal parasites: A, Amoeba coli, Losch; B, Monocystis agilis, Leuck., a gregarine; C, Megastoma entericum, Grassi, a flagellate; D, Balantidium coli, Ehr., a ciliate. few cases granules of chlorophyl are also to be found in organisms otherwise resembling animals too closely to be confused with plants. The cytoplasm may be soft and uniform in quality, or there may be a surface differentiation into ectosarc, or body covering, and endosarc, body substance. In the rhizopoda there is little difference between the two, though certain fresh-water ameba cover themselves with minute grains of mineral substance, but in most of the masti- gophora and infusoria corticata the ectosarc is characterized by a peculiar rigidity that gives the animal a definite and permanent form. From the surface covering or ectosarc coarse threads or fine hair-like appendages—flagella and cilia—often project. In many of the infusoria the ectosarc contains trichoc

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• bookcentury1900
• bookdecade1910
• booksubjectbacteri
• bookyear1916