. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. has been shown that these bacteria which have the power of in- dependent movement have on their bodies long hair-like appen- dages. In some, these appendages are many times the length of the body of the organisms. They may be situated at one or both poles or they may even surround the entire body of the organism. It is by the striking of the water with these whip-like appendages that the organisms are able to move. As one examines moving bacteria under the microscope one would think that they were moving w
. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. has been shown that these bacteria which have the power of in- dependent movement have on their bodies long hair-like appen- dages. In some, these appendages are many times the length of the body of the organisms. They may be situated at one or both poles or they may even surround the entire body of the organism. It is by the striking of the water with these whip-like appendages that the organisms are able to move. As one examines moving bacteria under the microscope one would think that they were moving with the speed of an ex- press train, but on actually meas- uring their speed it is found to be an illusion. The cholera organ- ism has been known to attain for a short distance the enormous speed of eight inches per hour! So we need not fear that they will overtake even the slowest by their own means of locomotion. These organisms have a more rapid and safer way of passing from place to place. Many of them use the common housefly as their airship, others the bedbug, while still others will chance a ride with the flea. At other times they find their way into food or on clothing and are transported from place to place. Some are picked up with the particles of dust, but to the disease-produc- ing organism this method of travel is more fatal than is the mod- ern airship to man. The spore-forming organisms, however, may make the journey in this manner with a fair degree of safety. It is not because the fall would hurt these specks of living matter, but when struck by the direct rays of the sun they are killed in a very short time. Many of them cannot withstand even diffused sun- light for any great length of time. Many of them could not have made the journey any great distance even in the dark, for their bodies are about 90 per cent water, and if not clinging to some moist substance they would soon lose sufficient moisture to cause Please note that these images are extracted
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteriologyagricult
