Preface; 1. Overview: transport of molecules across microbial membranes - a sticky business to get to grips with J. K. Broome-Smith and C. Mitsopoulos; 2. Multidrug resistance efflux K. Lewis; 3. Regulation of solute accumulation in bacteria and its physiological significance B. Poolman; 4. Arsenic transport systems from Escherichia coli to humans H. Bhattacharjee, M. Ghosh, R. Mukhopadhyay and B. P. Rosen; 5. Type II protein secretion: the main terminal branch of the general secretory pathway A. Filloux; 6. Type III secretion and the pathogenesis of Yersinia infections D. M. Anderson, L. W. Cheng, V. T. Lee, S. Masmanian, K. Ramamurthi, C. Tam and O. Schneewind; 7. Assembly of bacterial adhesins across the outer membrane via the chaperone-usher pathway G. E. Soto and S. J. Hultgren; 8. DNA uptake by transformable bacteria S. A. Lacks; 9. Escherichia coli signal recognition particle - a historical perspective Q. A. Valent, E. N. S. O'Gorman, P. Scotti, J. Luirink and S. High; 10. Protein translocation into the endoplasmic reticulum B. P. Young, J. K. Brownsword and C. J. Stirling; 11. Peroxisome biogenesis E. Lopez-Huertas and A. Baker; 12. Transport of proteins into and across the thylakoid membrane C. Robinson, W. Edwards, P. J. Hynds and C. Tissier; 13. Evolutionary origins of transmembrane transport systems M. H. Saier Jr and T.-T. Tseng; Index.