Fig. 6.

Electron microscopy (EM) analysis of the isolated cell wall of Tuwongella immobilis. (A) Scanning EM micrographs of untreated T. immobilis cells. White arrowheads point toward single-pore structures in the bacterial cell envelope. Scale bar: 500 nm. (B) Scanning EM micrographs of the isolated cell wall of T. immobilis. In addition to uniformly distributed smaller pores, a large single pore can is identified in the cell wall (white arrowhead). Scale bar: 500 nm. (C) Negative stain TEM micrographs of T. immobilis cell wall preparations served to estimate the surface density of the pores to ∼50 pores per µm². Scale bar: 500 nm.