chapter 1 Methods for Analyzing Floc Properties -- part I Freshwater Environments -- chapter 2 Overview of Flocculation Processes in Freshwater Ecosystems -- chapter 3 Intra-Storm and Seasonal Variations in the Effective Particle Size Characteristics and Effective Particle Density of Fluvial Suspended Sediment -- chapter 4 The Composite Nature of Suspended and Gravel Stored Fine Sediment in Streams -- chapter 5 Effects of Floc Size and Shape in Particle Aggregation -- chapter 6 Mapping Biopolymer Distributions in Microbial Communities -- chapter 7 Contrasting Roles of Natural Organic Matter on Colloidal Stabilization and Flocculation -- chapter 8 An Example of Modeling Flocculation in a Freshwater Aquatic System -- part II Saltwater Environments -- chapter 9 Transport of Materials and Chemicals by Nanoscale Colloids and Micro- to Macro-Scale Flocs -- chapter 10 Variability of Suspended Particle Concentrations, Sizes, and Settling Velocities -- chapter 11 Organic Rich Aggregates in the Ocean: Formation, Transport Behavior, and Biochemical Composition -- chapter 12 Equilibrium and Nonequilibrium Floc Sizes -- chapter 13 Coagulation Theory and Models of Oceanic Plankton Aggregation -- part III Engineered Systems -- chapter 14 Extracellular Enzymes Associated with Microbial Flocs from Activated Sludge of Wastewater Treatment Systems -- chapter 15 Molecular Analyses of Microbial Community Structure and Function of Flocs -- chapter 16 Using Atomic Force Microscopy to Study Factors Affecting Bioadhesion at Molecular to Nanoscale Levels -- chapter 17 Impact of Stresses or Transient Conditions on Deflocculation in Engineered Microbial Systems -- chapter 18 Flocs and Ultraviolet Disinfection -- chapter 19 Surface Thermodynamics and Hydrophobic Properties of Microbial Flocs -- part IV Summary -- chapter 20 Opportunities, Needs, and Strategic Direction for Research on Flocculation in Natural and Engineered Systems.