. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). STRUCTURE OF YEASTS 77 What are Yeasts Yeast plants are always microscopic, no species being large enough to be seen with the naked eye. When these tiny plants are massed together, as in a yeast cake, the mass may form a bulk large enough to be seen. We can see a yeast cake, but the individual yeast plant is not more than -^ of an inch in diameter, and this is far be- low the power of the unaided vision. By the microscope alone we learn that the yelst mass is made up of millions of minute bodies, each of which
. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). STRUCTURE OF YEASTS 77 What are Yeasts Yeast plants are always microscopic, no species being large enough to be seen with the naked eye. When these tiny plants are massed together, as in a yeast cake, the mass may form a bulk large enough to be seen. We can see a yeast cake, but the individual yeast plant is not more than -^ of an inch in diameter, and this is far be- low the power of the unaided vision. By the microscope alone we learn that the yelst mass is made up of millions of minute bodies, each of which is an individual yeast plant. The yeast plants are much simpler than the molds. If a bit of a yeast cake be mixed with a little water and examined under the microscope, there will be found what is shown in Fig. 32. There will be seen large numbers of minute oval bodies, sometimes very nearly spherical or sometimes considerably longer than broad. They are quite color- less and nearly transparent, as seen under the micro- scope, but whitish when seen in bulk. They have a. d e Fig. 32. Common yeast very highly magnified. Figs, a and b show vacuoles; c shows a nucleus n inside of the yeast cell; d shows a budding cell with the nucleus dividing; e shows the cell divided, the new cell containing a bit of the old 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 Conn, H. W. (Herbert William), b. 1859. Boston, New York, Ginn and Company
Size: 1713px × 1458px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1917
