Household bacteriology for students in domestic sciences / by Estelle D. Buchanan ... and Robert Earle Buchanan.

  • Buchanan, Estelle D. (Estelle Denis Fogel), 1876-
Date:
1913
Catalogue details

Licence: In copyright

Credit: Household bacteriology for students in domestic sciences / by Estelle D. Buchanan ... and Robert Earle Buchanan. Source: Wellcome Collection.

    63/570 page 43
    Fig. 38. Various typies of budding yea.st cells. (Adapted from Hansen.) actions characteristic of true cellulose. The wall is often greatly thickened in old cells. Gelati- nous capsules of es- sentially the same character as those found among the bacteria may be present, surrounding a yeast cell. Fla- gella are never ])io- duced, and the yeast cells are never motile. Cell Contents. — The protoplasm or lining contents of the yeast cell may be separated into three components: the ectoplast, the cytoplasm, and the nucleus. In addition certain cell inclusions are to be noted, par- ticularly vacuoles, granules, and oil globules. The ecto- plast in the yeasts, as in the bacteria, is the outer differ- entiated layer of the protoplasm ly- ing just within the cell wall and ap- pressed to it. It undoubtedly acts as a semipermeable or osmotic mem- Fig. 3g. Budding yeast cells. (Photomicrograph.) brane, and determines what may enter and what may leave the
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