. Biology and human life. Biology. Fig. 146. Types of bacteria There are three main groups of bacteria, classified according to the general form or shape of the cell: a, round-celled, or coccus, type (plural, cocci, pronounced kok's't); in some species the cells scatter; in some they cling together in clumps; in others they cling together in chains, b, rod-shaped t\T)e, or bacilli; in some the length is barely greater than the thickness; in other species the cell is several times as long as it is thick, r, the spiral type, or spirilla; in some this is hardly more than a rod with two or three b
. Biology and human life. Biology. Fig. 146. Types of bacteria There are three main groups of bacteria, classified according to the general form or shape of the cell: a, round-celled, or coccus, type (plural, cocci, pronounced kok's't); in some species the cells scatter; in some they cling together in clumps; in others they cling together in chains, b, rod-shaped t\T)e, or bacilli; in some the length is barely greater than the thickness; in other species the cell is several times as long as it is thick, r, the spiral type, or spirilla; in some this is hardly more than a rod with two or three bends; in other species it has a rather definite corkscrew appearance cell grows. After reaching a certain size the cell divides into two by a rather simple process of splitting through the middle crosswise. Bacteria of one kind or another will grow wherever there is organic matter, moisture, and not too low or too high a temperature. They are destroyed by sunshine, by various chemi- cals, and by the temperature of boiling water; in many species a much lower temperature is fatal. When the temperature gets too low, the metabolism of bacteria will be suspended, but as a rule they cannot be destroyed by freezing. Like many other organisms, bacteria that are frozen can resume their activities on being thawed out again, provided the change is not too rapid. Apparently freezing has the same effect as drying, since it locks. 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston, New York [etc. ] Ginn and Company
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