Ishiguro E E, Wolfe R S
J Bacteriol. 1970 Oct;104(1):566-80. doi: 10.1128/jb.104.1.566-580.1970.
Geodermatophilus grows in two major forms, a nonmotile irregularly shaped aggregate of coccoid cells (C-form) and a motile budding rod (R-form). Morphogenesis can be controlled by an unidentified factor in Tryptose which is required for maintenance of the organism in the C-form and for differentiation of the R-form to the C-form. Morphogenetic events occur synchronously in the described system. Ultrastructural studies show that the major difference between C- and R-forms is in cells envelope structure. R-form cell walls consist of two layers, an inner transparent membranous layer (10 to 12.5 nm thick) and an outer dense diffuse layer (7.5 to 10 nm). In addition to these layers, the C-form has a thick fibrous layer (30 nm) over the dense layer. This layer appears to be a cementing substance which holds the coccoid cells together.
嗜土放线菌以两种主要形态生长，一种是由球状细胞组成的无运动性、形状不规则的聚集体（C型），另一种是有运动性的芽生杆菌（R型）。形态发生可由胰蛋白胨中一种未知因子控制，该因子对于维持生物体的C型以及R型向C型的分化是必需的。在所描述的系统中，形态发生事件同步发生。超微结构研究表明，C型和R型之间的主要差异在于细胞包膜结构。R型细胞壁由两层组成，一层是内部透明的膜状层（厚10至12.5纳米）和一层外部致密的弥散层（厚7.5至10纳米）。除了这些层之外，C型在致密层之上还有一层厚纤维层（30纳米）。这一层似乎是一种将球状细胞黏合在一起的胶结物质。
