Principles and practice of operative dentistry . .Genus IV. Vibrio. Spiral rods ; spore formation III. Leptotrichse. These are all thread is a practical and convenient classification. Pasteur classified all bacteria under two general divisions, from theirrelations to oxygen ; one division he termed Aerobes, the other Anuerobes. The aerobic bacteria requireFig. 228. the oxygen of the atmosphere in order to maintain existence,and therefore live upon the sur-faces of substances. The yeast fu7igi are examplesof aerobic bacteria (Fig. 228). Fig. 229 (opp. p. 94) shows onefor
Principles and practice of operative dentistry . .Genus IV. Vibrio. Spiral rods ; spore formation III. Leptotrichse. These are all thread is a practical and convenient classification. Pasteur classified all bacteria under two general divisions, from theirrelations to oxygen ; one division he termed Aerobes, the other Anuerobes. The aerobic bacteria requireFig. 228. the oxygen of the atmosphere in order to maintain existence,and therefore live upon the sur-faces of substances. The yeast fu7igi are examplesof aerobic bacteria (Fig. 228). Fig. 229 (opp. p. 94) shows oneform of yeast fungi—the anaerobic bacteria donot require oxygen to maintainexistence, hence they live be-neath the surfaces of liquidsand within the tissues of livingbodies. The Bacterium tetani isan example of the anaerobicbacteria ; oxygen retards its growth or completely arrests its very large proportion of all the bacteria are aerobic. Some of themare so dependent upon oxygen that even the slightest diminution in the. Various forms of yeast fungi, a, colonies of roundcells (saccliaromyces conglomeratus ?); b, single cells ofdifferent forms partly forming daughter-cells; c, cylin-drical cells of the pellicle fungus (saccharomyces myco-derma). BACTERIOLOGY OF THE MOUTH. 97 amount is sufficient to retard or completely arrest their are termed ohligate aerobic bacteria. Others will develop equallywell in a medium rich in oxygen, or where there is no oxygen, or rather,independent of the atmosphere. These are called facultative aerobic bac-teria, i^early all the disease-producing forms of bacteria belong to thefacultative variety. The fluids and tissues of the body contain a certainamount of oxygen, but this is soon consumed by the rapid growth andmultixDlication of the bacteria ; consequently their development would bearrested or their existence terminated did they not possess the faculty ofliving under certain conditions without the pres
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
