chapter 1 H+-ATPases in the Plasma Membrane -- chapter 2 H+-ATPase and H+-PPase in the Vacuolar Membrane -- chapter 3 The Cytoplasmic pH Stat -- chapter 4 Confocal pH Topography in Plant Cells -- chapter 5 pH as a Signal and Regulator of Membrane Transport -- chapter 6 The Role of the Apoplastic pH in Cell Wall Extension and Cell Enlargement -- chapter 7 Mechanisms and Physiological Roles of Proton Movements in Plant Thylakoid Membranes -- chapter 8 Dynamics of H+ Fluxes in Mitochondrial Membrane -- chapter 9 H+ Fluxes in Nitrogen Assimilation by Plants -- chapter 10 Crassulacean Acid Metabolism -- chapter 11 Dynamics of H+ Fluxes in the Plant Apoplast -- chapter 12 H+ Currents around Plant Roots -- chapter 13 Role of pH in Availability of Ions in Soil -- chapter 14 Regulation of Microbial Processes by Soil pH -- chapter 15 The Role of Acid pH in Symbiosis between Plants and Soil Organisms -- chapter 16 Distribution of Plant Species in Relation to pH of Soil and Water.