培养特性 A microcolony growing on the surface of middlebrook 7H10 agar observed microscopically under low-power optics. Note that the bacterial cells are arranged in an undulating, serpiginous pattern. This indicates the production of cording factor as illustrated in the acid-fast stain shown in Color plate 17-ll培养特性 A microcolony growing on the surface of Middlebrook 7H10 agar, observed microscopically under low-power optics. Note that the bacterial cells are arranged in an undulating, serpiginous pattern. This indicates the production of cording factor. as illustrated in the acid-fast stain shown in Color Plate 17-1I