Sykes J A, Miller J N
Infect Immun. 1973 Jan;7(1):100-10. doi: 10.1128/iai.7.1.100-110.1973.
Ultrathin sections of Treponema pallidum (Nichols strain), T. denticola (microdentium), and T. reiteri have been studied in the electron microscope to determine the location of the axial filaments and some of the dimensions of these organisms. The axial filaments of T. pallidum (Nichols strain) have been seen to be tubular in cross section with an overall diameter of 21.0 +/- 0.73 nm, and an electron-lucent core of 8.0 nm. The filaments were found to lie on the outside of the organism which had only one membranous structure surrounding the protoplasmic core. These findings were in contrast to those obtained for T. denticola and T. reiteri where the axial filaments did not exhibit a hollow core and were located between an outer membrane and an inner membrane surrounding the protoplasmic core. The outside diameter of T. denticola was determined to be 224.9 +/- 2.83 nm, and that of T. reiteri as 331.0 +/- 4.15 nm, contrasting with T. pallidum (Nichols strain) which had a diameter of 163.0 +/- 1.9 nm.
对梅毒螺旋体（Nichols株）、齿垢密螺旋体和Reiter密螺旋体的超薄切片进行了电子显微镜研究，以确定轴丝的位置以及这些微生物的一些尺寸。已观察到梅毒螺旋体（Nichols株）的轴丝在横切面上呈管状，总直径为21.0±0.73纳米，有一个8.0纳米的电子透明核心。发现这些丝位于该微生物的外部，该微生物只有一层围绕原生质核心的膜结构。这些发现与齿垢密螺旋体和Reiter密螺旋体的情况形成对比，在后者中，轴丝没有中空核心，位于围绕原生质核心的外膜和内膜之间。齿垢密螺旋体的外径测定为224.9±2.83纳米，Reiter密螺旋体的外径为331.0±-4.15纳米，与直径为163.0±1.9纳米的梅毒螺旋体（Nichols株）形成对比。
