. The actinomycetes: their nature, occurrence, activities, and importance. Actinomyces; Actinomycetales. 0CAI. LIST nf ILLUSTRATIONS Figure l.—Streptothrix of Ferdinand Cohn xx Figure 2.—First photograph of a species of Micromonospora (1899) . 8 Figure 3.—Structure of actinomyces mycehum 11 Figure 4.—Typical growth of aerobic actinomycetes upon agar slants . 16 Figure 5 a-d.—Different types of branching of aerial mycelium of species of Streptomyces 18/21 Figure 6.—Nocardia asteroides, grown on potato dextrose-beef extract agar 25 Figure 7.—Nocardia asteroides, grown on potato dextrose-beef ext
. The actinomycetes: their nature, occurrence, activities, and importance. Actinomyces; Actinomycetales. 0CAI. LIST nf ILLUSTRATIONS Figure l.—Streptothrix of Ferdinand Cohn xx Figure 2.—First photograph of a species of Micromonospora (1899) . 8 Figure 3.—Structure of actinomyces mycehum 11 Figure 4.—Typical growth of aerobic actinomycetes upon agar slants . 16 Figure 5 a-d.—Different types of branching of aerial mycelium of species of Streptomyces 18/21 Figure 6.—Nocardia asteroides, grown on potato dextrose-beef extract agar 25 Figure 7.—Nocardia asteroides, grown on potato dextrose-beef extract agar 27 Figure 8.—Branching and sporulation of different strains of Nocardia . 29 Figure 9.—Sporulation of straight aerial hyphae of species of Streptomyces 39 Figure 10.—Streptomyces venezuelae, grown on potato dextrose-beef ex- tract agar 44 Figure 11.—Streptomyces sp., grown on potato dextrose-beef agar . . 47 Figure 12 a-d.—Different forms of sporulation of Micromonospora growing in composts, as shown by contact slide preparations 52/55 Figure 13.—Details of sporulation and of spore germination by S. griseus as shown by electron microscope 56 Figure 14.—Aerial mycelium of a Streptomyces, showing zonation or "fairy ring" formation 58 Figure 15.—Electron micrograph of actinophage 61 Figure 16.—Method of measuring actinophage concentration .... 64 Figure 17.—Variants of Streptomyces griseus growing on yeast extract- glucose agar 70 Figure 18.—Metabolic changes produced by S. lavendulae in aerated and stationary cultures 85 Figure 19.—Metabolic changes produced by S. antibioticus in aerated and stationary cultures 88 Figure 20.—Influence of temperature upon growth and carbon dioxide production by actinomycetes 92 Figure 21.—Decomposition of hemicelluloses by actinomycetes, as meas- ured by CO:; evolution 93 Figure 22.—The use of the agar cross-streak method for testing the ability of actinomycetes to produce antibiotic
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