How to calculate dilution factor and sample concentration for enumeration of bacteria. For microbiology students taking SIR2005

I have published an ebook "Practical Bacteriology" to guide readers on the culturing, enumeration and identification of bacteria. For the enumeration, I cover both culture dependent (pour plating, spread plating, most probable number, membrane filtration technique) and culture independent methods. You can buy it from here:
https://www.lulu.com/en/us/shop/choon...