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Sentences for "bacterium "
The morphology of the same bacterium may vary greatly under different conditions.
-Dragrammatic sketch of composite bacterium to illustrate details of anatomical structure.
-Dragrammatic sketch of composite bacterium to illustrate details of anatomical structure.
For the successful achievement of these objects it is necessary to provide nutriment in a form suited to the needs of the particular bacterium or bacteria under observation, and in a general way it may be said that the nutrient materials should approximate as closely as possible, in composition and character, to the natural pabulum of the organism.
The difference between the titre of the medium in the two flasks gives the total acid production of the bacterium under observation in terms of normal NaOH.
-The resistance exhibited by any given bacterium toward any specified disinfectant or germicide should be investigated with reference to the following points: (A) Inhibition coefficient-i.
, the time exposure necessary to kill vegetative forms of the bacterium suspended in water at 20° to 25° C, in which the disinfectant is present in medium concentration (concentration insufficient to cause plasmolysis).
And if the bacterium is one which forms spores, (C) Superior lethal coefficient-i.
, the time exposure necessary to kill the spores of the bacterium under conditions similar to those obtaining in B.
The further study of the pathogenetic powers of any particular bacterium involves the active immunisation of one or more previously normal animals.
The resemblances, morphological and cultural, existing between certain pathogenetic bacteria are in some cases so great as to completely overwhelm the differences; again the same bacterium may under varying conditions assume appearances so different from those regarded as typical or normal as to throw doubt on its identity.
It is only by a careful and elaborate study of the behaviour of the animal cell and the body fluids vis-à-vis with the infecting bacterium that it becomes possible to throw light upon the complex problem whereby the cell opposes successful resistance to the diffusion of the invading microbe, or succeeds in driving out[Pg 334] the microbe subsequently to the occurrence of that diffusion.
If the filtrate is not sterile, subcultivate the organism passed and determine its identity with the test bacterium before rejecting the filter-since the filtrate may have been accidentally contaminated.
Given that premise, why couldn't one species--a bacterium or virus, perhaps--run amok and destroy all other life on earth before finally succumbing itself?
Some years ago a Congressman introduced a bill to change the genus name of the bacterium Salmonella, which includes the species causing typhoid fever and other diseasecausing species.
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