If you cannot find the PDF legally, or if you need modern updates regarding recombinant DNA technology (which Patel touches on lightly, as it was emerging at the time of writing), pair Patel with:
Patel simplifies the complexity of bioprocess technology into digestible categories: Industrial Microbiology By A H Patel.pdf
What makes this text deep isn’t just the strain selection protocols or fermentation kinetics. It’s the underlying philosophy: If you cannot find the PDF legally, or