. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). CLASSIFICATION OF BACTERIA 123 « O O o /:^^rf Rod-shaped bac- teria. Rod-shaped Bacteria. These are in the shape of rods of greater or less length. They are usually somewhat rounded at the ends and may be only a little longer than they are broad, or they may be ^^ Q O very many times as long as broad " (). When one of these grows it lengthens and commonly soon divides into two, but they may con- tinue to lengthen for a time without Fig. 50. manifesting any signs of division. In such a case they form
. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). CLASSIFICATION OF BACTERIA 123 « O O o /:^^rf Rod-shaped bac- teria. Rod-shaped Bacteria. These are in the shape of rods of greater or less length. They are usually somewhat rounded at the ends and may be only a little longer than they are broad, or they may be ^^ Q O very many times as long as broad " (). When one of these grows it lengthens and commonly soon divides into two, but they may con- tinue to lengthen for a time without Fig. 50. manifesting any signs of division. In such a case they form long slender threads, as shown in Fig. 50, b. These threads, however, eventually break up into short sections (Fig. 50, c). Some of these rod- shaped bacteria have flagella are capable of active motion (Fig. 48, b, c); others have no flagella and are quite without the power of motion (Fig. 48, </). Several names are given to bacteria of this shape ; Bacterium and Bacillus are two of those most commonly used. Spiral Bacteria. A third type of bacteria is in the form of a spiral rod, shown in Fig. 51. These, however, are somewhat uncommon and of less importance than the others. Like the other forms they may possess flagella or they may be without them. Multiplication. The growth and multiplication of bacteria is ex- tremely simple and consists in a lengthening of the individual followed by its division. A sphere becomes slightly oval in shape and then divides in the middle to produce two spheres, as shown in Fig. 52, Fig. 51. Spiral 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: 1804px × 1386px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1917
