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By Russell C. Johnson

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Some historical background will be listed, along with a few generalizations about past attempts. The main thrust of this presentation centers on the feasibility of tissue culture for cultivation of T. pallidum. In discussing some of the inherent difficulties, it will be necessary to examine the role of O2/ concepts of strict anaerobiosis, and mechanisms of 0 2 toxicity. A few pertinent points will then be mentioned about our previous and current studies. Finally, we will summarize by relating our findings to in vivo infection.

A. E. RITCHIE Fig. 7. Serotype illini (3055), thin-sectioned. A. Side view of its asymmetric inner membrane; the thickened portion represents this organism's "body fibrils". B. Endon view of the inner membrane illustrating its three "body fibrils" (arrows). 1 μm. Fig. 8. Unclassified Leptospira (Ames BN-1), thinsectioned. A. Portion of a "lamellar body" derived from the cell's inner membrane; visual proof of contiguity is rare. B. Typical distension of the cell's outer membrane (coil) terminating in a tubular portion of uniform diameter (40-50 nm) at right.

2 μm. 31 A. E. RITCHIE Fig. 22. Leptospira biflexa (B-16), ΡΤΆ negativelystained. Polar columnar structures, ca 9 nm long (arrow), bind the cell's outer and inner membranes. These are usually noted only with certain saprophytes. Some fields suggest that they are not confined to the pole tip. 2 μm. Fig. 23. Leptospira biflexa (B-16), ΡΤΆ negativelystained. Its detached axial filament (AF) is at the upper left. The AF attachment region (arrows) consists of a large, 65 nm, circular disc with a 10-12 nm central hole (bright area) surrounded by a 20 nm annular ring.

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