. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SHAPE OF MICROORGANISMS 35 toward the bacteria which are invading the body of the individual who is suffering with boils. Molds,—^The body of a mold is composed of numerous cells, whereas the bodies of bacteria and yeasts are single cells. The thread-like processes which compose their body are known as mycelia (singular, mycelium). The individual threads are called hyphae. In the molds there is a division of la- bor. Some threads serve for the taking up of nu- trients and are called vegetative hyphae/ the
. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SHAPE OF MICROORGANISMS 35 toward the bacteria which are invading the body of the individual who is suffering with boils. Molds,—^The body of a mold is composed of numerous cells, whereas the bodies of bacteria and yeasts are single cells. The thread-like processes which compose their body are known as mycelia (singular, mycelium). The individual threads are called hyphae. In the molds there is a division of la- bor. Some threads serve for the taking up of nu- trients and are called vegetative hyphae/ the Others produce spores, fertile hyphae. The cells composing the molds are similar to those of the yeasts in that they have a definite nucleus. They multiply mainly by the production of spores which are produced in the fertile hyphae* above the surface of the medium and hence can be dislodged and spread by currents of air. They grow under conditions of acidity and moisture which are inimical to the growth of bacteria and yeasts. They differ from bacteria in that they all require free oxygen. They play a great part in the spoilage of foods and are second only to bacteria in impor- tance in soil processes. Few are pathogenic. More of the molds than of the yeasts produce diseases in man and the lower Fig. 20.—Dra^^ving of a mold 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 Greaves, Joseph Eames, 1880-; Greaves, Ethelyn O. , joint author. New York, D. Van Nostrand Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteriologyagricult
