By R. W. Fairbrother (Auth.)
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Additional resources for A Text-Book of Medical Bacteriology
26 A TEXT-BOOK OF MEDICAL BACTERIOLOGY spheric conditions, the temperature of incubation and, in certain cases, the presence of accessory factors in the medium. Atmospheric Conditions. Considerable variation is shown by the different bacterial species in their atmospheric requirements. All, however, multiply better in the dark than in the light ; direct sunlight generally exercises a marked bactericidal action, which is due mainly to the ultra-violet rays. Respiration is exhibited by all bacteria, oxygen exchange being an essential feature of bacterial metabolism.
The reaction, of a solution :— ρΉ. = log I/H ion concentration. H ion concentration of distilled water = 1/107. '. pH of distilled water = 7. A pH over 7 indicates alkalinity and one below 7 acidity. The majority of bacteria grow best in slightly alkaline media at a ^ H of 7-2-7-6. The estimation of pH may be carried out very roughly by means of litmus paper, but, as in many instances the parasitic bacteria only multiply within a limited range of reaction, the adjustment of the medium has consequently to be more accurately performed.
Substances such as acids which are injurious for certain species may be produced and so, in certain cases, a preponderance of special types may occur. I t has been noted on occasions that, when two organisms are growing together under artificial conditions, the growth of one may have a beneficial effect on the growth of the other ; this is sometimes termed symbiosis. An example is the influence of the staphylococcus on the growth of the influenza bacillus on blood agar media due to the production by the former of the V accessory factor.
A Text-Book of Medical Bacteriology by R. W. Fairbrother (Auth.)