Chapter 1 Nano cerium oxide in medicine, agriculture and the industry -- Chapter 2 Synthesis and sensing applications of peroxidase-mimic nanozyme -- Chapter 3 Nanozymes for glucose sensing and diabetes management -- Chapter 4 Nanozymes for bioimaging and disease diagnostics -- Chapter 5 Nanozymes for improving anticancer therapy -- Chapter 6 Enzyme-based nanomedicine for cancer therapy -- Chapter 7. Synthesis of two-dimensional metal, metal oxide and metal hydroxide nanomaterials for biosensing -- Chapter 8 Biological applications of nanozymes.