The Gottingen transmission X-ray microscope (TXM) at BESSY has been used for threedimensional imaging. As a first test-object sheaths of the bacteria Leptothrix Ochracea have been visualized. 33 tilted-view images have been taken at tilt angles between 0 and 160 degrees in steps of 5 degrees. Before reconstruction the images were flat-field corrected and aligned. The rotation axis was determined and the images were rotated accordingly. For tomographic reconstruction a fast MART (Multiplicative Algebraic Reconstruction Technique) algorithm was used. In the recon-structed volume structures of sizes well below 100 nm are made visible.
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