Dear visitor, although the nut has been cracked, you clicked on the button "Continue". I want to comment on the aim of the following pages: I've found explanations in microbiological textbooks, suggesting that authors had difficulties to explain the matter, but students have to learn it by heart for examinations. On the other hand I miss such graphic examples as continuous dilution, which could even be realized in experimental trials with pupils to "play with mathematics". Be careful with clicks on question marks - you may find some explanations beneath your dignity. G. Pollach

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