. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. -Colony of colon bacilli grown insoft gelatin. Fig. 45.—One large irregular colony ofcolon and two smaller colonies of typhoidbacilli in soft gelatin. (Figs. 43 to 45from photographs by Dunham.) even distribution of the colonies in this way, and for comparative work themethod gives rehable results. The counts by this method average about 10per cent, lower than where mixing is done in the dish. In place of dilutions made by pipettes, a series of loops or rings on a platinumneedle can be em
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. -Colony of colon bacilli grown insoft gelatin. Fig. 45.—One large irregular colony ofcolon and two smaller colonies of typhoidbacilli in soft gelatin. (Figs. 43 to 45from photographs by Dunham.) even distribution of the colonies in this way, and for comparative work themethod gives rehable results. The counts by this method average about 10per cent, lower than where mixing is done in the dish. In place of dilutions made by pipettes, a series of loops or rings on a platinumneedle can be employed which hold a, known quantity (small) of the materialto be examined. 116 THE CULTIVATION OF MICROORGANISMS To obtain a satisfactory count the colonies should be about 100 to 200 to aplate. Lower numbers than this are too few to give a fair average, highernumbers are difficult to count because the colonies have not sufficient space for.
Size: 2002px × 1248px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, bookidcu31924000235212
