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Scanning electron microscopy has been used to visualize the residents of microbial communities populating habitats on epithelial surfaces in the gastrointestinal tracts of mice. In the stomach, bacteria form a dense layer on the stratified squamous epithelium of the nonsecreting area. Microbes of at least three morphological types can be seen in this layer, including short rods with round ends, rods in chains, and tapering filaments composed of repeating units of rod- or coccal-shaped elements varying in size from large at one end of the filament to small at the other end. These three forms all attach by one end to the epithelium. The latter two forms can be found only so attached; in both cases, the end is inserted into a hole or depression in the keratinized epithelium. In the small intestine, a microbe of morphology similar to that of the tapering filaments found in the stomach can be seen attached end-on to the epithelium. Again each filament has one end inserted into a hole in the epithelium. In this case, however, the repeating elements of each filament are all about the same size. In the cecum and colon, predominantly fusiform- and spiral-shaped microbes can be seen mixed together in layers on the epithelium. At least three types of fusiform-shaped microbes can be distinguished on the basis of surface texture, and one type of spiral-shaped microbe can be found. These microorganisms appear to be attached to each other and to the epithelium by weblike filaments. The numerous microbial types present in the various epithelial habitats associate intimately surface-to-surface with each other and with the epithelium. Such surface-surface association may be an important autogenic factor contributing to the stability of the murine gastrointestinal ecosystem.

infection and immunity

Surface-Surface Associations in Microbial Communities Populating Epithelial Habitats in the Murine Gastrointestinal Ecosystem: Scanning Electron Microscopy