“…Initially gels prepared in the laboratory were used, later followed by commercially available ready-touse gels, usually affording better reproducibility. Specific detection methods were applied for the visualization of enzymes [30,31,70]. Only few authors in the field of natural history have used other techniques, such as twodimensional gel electrophoresis [32,34], PAGE [2,6,14,33], titration curves, found particularly useful for bacterial taxonomy [35,36], as well as blotting and immunoblotting techniques [37,38].…”