Sjögren A, Hovmöller S, Farrants G, Ranta H, Haapasalo M, Ranta K, Lounatmaa K
J Bacteriol. 1985 Dec;164(3):1278-82. doi: 10.1128/jb.164.3.1278-1282.1985.
The structures of crystalline layers from six Bacteroides strains were studied by electron microscopy. Two different hexagonal crystalline surface layers were found, one with a unit cell spacing of 21.5 nm and another with a spacing of 7.7 nm. A three-dimensional structure of the 21.5-nm layer and a two-dimensional projection of the 7.7-nm layer were determined to 3.0- and 3.8-nm resolution, respectively, by computerized image processing of electron micrographs. Both of these two crystalline layers were found in all six strains studied: B. pentosaceus NP333T and WPH61, B. capillus ATCC 33690T and ATCC 33691, and B. buccae ATCC 33574T and ES57. This further supports the identity of B. pentosaceus, B. capillus, and B. buccae as suggested by M. Haapasalo, K. Lounatmaa, H. Ranta, H. Shah, and K. Ranta (Int. J. Syst. Bacteriol. 35:65-72, 1985). The surface layer with 21.5-nm spacing is an intricate network with two classes of pores through the layer.
通过电子显微镜研究了六种拟杆菌菌株的晶体层结构。发现了两种不同的六边形晶体表面层，一种晶胞间距为21.5 nm，另一种间距为7.7 nm。通过对电子显微照片进行计算机图像处理，分别以3.0 nm和3.8 nm的分辨率确定了21.5 nm层的三维结构和7.7 nm层的二维投影。在所研究的所有六种菌株中均发现了这两种晶体层：戊糖拟杆菌NP333T和WPH61、毛细拟杆菌ATCC 33690T和ATCC 33691，以及颊拟杆菌ATCC 33574T和ES57。这进一步支持了M. Haapasalo、K. Lounatmaa、H. Ranta、H. Shah和K. Ranta（《国际系统细菌学杂志》35:65 - 72，1985年）所提出的戊糖拟杆菌、毛细拟杆菌和颊拟杆菌的同一性。具有21.5 nm间距的表面层是一个复杂的网络，有两类贯穿该层的孔。
