1 Introduction -- 2 Basic Principles -- 3 Theoretical Aspects -- 4 Fluorescence Detection Techniques -- 5 Molecular-Size Fluorescence Emitters -- 6 Nanoscale Fluorescence Emitters -- 7 Fluorescent Nanocomposites -- 8 Recognition Units -- 9 Mechanisms of Signal Transduction -- 10 Supramolecular Structures and Interfaces for Sensing -- 11 Non-Conventional Generation and Transformation of Response -- 12 The Sensing Devices -- 13 Focusing on Targets -- 14 Sensing Inside the Living Cells -- 15 Sensing the Whole Body and Clinical Diagnostics -- 16 Opening New Horizons -- Epilogue -- Appendix. Glossary of Terms Used in Fluorescence Sensing -- Index.