. Bacteriology and the public health. Bacteriology; Public health. 10 THE BIOLOGY OF BACTERIA Two other signs of degeneration are the appearance of granules in the body of the cell-protoplasm known as metachromatic granules, owing to their different staining propensities, and the polar bodies which are seen in some species of bacteria. Surrounding the mass of mycoprotein, we find in most organisms a capsule or membrane composed, in part at least, of cellulose. This sheath plays a protective part in several ways. During the adult stage of life it protects the mycoprotein, and holds it together.
. Bacteriology and the public health. Bacteriology; Public health. 10 THE BIOLOGY OF BACTERIA Two other signs of degeneration are the appearance of granules in the body of the cell-protoplasm known as metachromatic granules, owing to their different staining propensities, and the polar bodies which are seen in some species of bacteria. Surrounding the mass of mycoprotein, we find in most organisms a capsule or membrane composed, in part at least, of cellulose. This sheath plays a protective part in several ways. During the adult stage of life it protects the mycoprotein, and holds it together. At the time of reproduction or degeneration it not infrequently swells up, and forms a viscous hilum or matrix, inside which are formed the new sheaths of the younger generation. It may be rigid, and so maintain the normal shape of the species, or, on the other hand, flexible, and so adapted to rapid movement of the individual. Here, then, we have the major parts in the constitution of a bacillusâits body, mycoprotein; its capsule, cellulose. But, further. /â Fig. 3.âDiagrams of ISTormal and Polymorphic Forms of Tubercle Bacilli. than this, there are a number of additional distinctive characteristics as regards the contents inside the capsule which call for mention. Sulphur occurs in the Beggiatoa which thrive in sulphur springs. Starch is commoner still. Iron as oxide or other combination is found in several species. Many contain pigments, though these are generally the "innocent" bacteria, in contradistinction to the_ disease-producing. A pigment has been found which is designated bacterio-purpurin. According to Zopf, the colouring agents of bacteria are the same as, or closely allied to, the colouring matters occurring widely in nature. Migula holds that most of the bacterial pigments are non-nitrogenous bodies. There are a very large number of chromogenic bacteria, some of which produce exceedingly brilliant colours. Among some of the commoner forms possessing
Size: 1615px × 1548px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectbacteri, bookyear1904
