History and early investigation on mode of action of peroxi- dizing herbicides; Structural evolution and synthesis of di- phenyl ethers, cyclic imides and related compounds; Recent advances in peroxidizing herbicides (patent overview); Structure/activity relationship and molecular design of her- bicides with cyclic imide and related structures; Structure /activity relationship of diphenyl ethers and other oxygen- bridged protoporphyrinogen oxidase inhibitors; General phy- siological characteristics and mode of action of peroxidi- zing herbicides; Metabolic modification of isoimide-type per oxidizing compounds; The metabolic pathway of tetrapyrrole biosynthesis; Characteristics of protoporphyrinogen oxidase; Assay systems for peroxidizing herbicides; Herbicidal effi- cacy of protoporphyrinogen oxidase inhibitors; Antagonizing peroxidizing herbicides; Strategy for peroxidizing herbicide resistant crops; Metabolism and degradation of porphyrin biosynthesis inhibitor herbicides; Toxicology of peroxidi- zing herbicides to mammals and non-target organisms