. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Fig. 56.—Types of colonies: 0, Cochleate (B. coli, abnormal form); h, conglom- erate (B. zopfii); c, ameboid (B. vulgatus); (i, filamentous (Frost). tion and liquefaction, develop after the colony is several days old and indeed sometimes not until much later. Again, many colonies make their first appearance as minute, sharply circumscribed points, and later spread upon the surface of the culture-medium, either in the form of a thin, homogeneous layer or
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Fig. 56.—Types of colonies: 0, Cochleate (B. coli, abnormal form); h, conglom- erate (B. zopfii); c, ameboid (B. vulgatus); (i, filamentous (Frost). tion and liquefaction, develop after the colony is several days old and indeed sometimes not until much later. Again, many colonies make their first appearance as minute, sharply circumscribed points, and later spread upon the surface of the culture-medium, either in the form of a thin, homogeneous layer or a filamentous cluster. It is particularly important that in describing new species of bac- teria an account of the appearance of the colonies from day to day, comparing all of their variations for at least two weeks, should be included. €1/ V^^^^^A^^JJ^^^^.mi^XJ'XH 1) my/MV/yy/Am^ d rig. S7-—Surface elevations of growths: a, Flat; b, raised; c, convex; d, pulvi- nate; e, capitate;/, umbilicate; g, umbonate (Frost). Pure Cultures.—Single colonies also subserve a second very im- portant purpose, that of enabling us to secure pure cultures of bacteria from a mixture. For this purpose an isolated colony is selected and carefully examined to see that it is single and not a mixture of two closely approximated colonies of different kinds, and then trans- planted to a tube of an appropriate culture-medium. If the colonies are few and of good size, each is picked up with a sterile platinum wire and transplanted to a tube of appropriate culture-medium. If, however, the colonies are numerous, of small size, and close to-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McFarland, Joseph, 1868-. Philadelphia and London, W. B. Saunders Company
Size: 2190px × 1141px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteri, bookyear1916
