Structure and Evolution -- Plasmids as Organisms -- Report on a Workshop: Structure and Function -- Evolutionary Relevance of Genetic Rearrangements Involving Plasmids -- Mechanisms of Transposition in Bacteria -- Insertion of Transcriptional Elements Outside the Replication Region Can Interfere with Replication, Maintenance, and Stability of ColE1-Derived Plasmids -- Studies on the Transposition of IS1 -- On the Transposition and Evolution of Tn1721 and its Relatives -- Repeated DNA Sequences Recombine 1,000 Times More Frequently in a Plasmid Than in the Chromosome of BacillusSubtilis -- Mercury Resistance Transposon Tn813 Mediates Chromosome Transfer in Rhodopseudomonas sphaeroides and Intergeneric Transfer of pBR322 -- Report on a Workshop: Plasmids in Unusual Systems -- Replication, Incompatibility, and Partition -- Chairman's Introduction: Replication, Incompatibility, and Partition -- Role of the ? Initiation Protein and Direct Nucleotide Sequence Repeats in the Regulation of Plasmid R6K Replication -- Initiation of Replication of the EscherichiaColi Chromosomal Origin Reconstituted with Purified Enzymes -- Origin and Initiation Sites of ?dv DNA Replication In Vitro -- Broad Host-Range Plasmid R1162: Replication, Incompatibility, and Copy-Number Control -- Control of Plasmid Replication: Theoretical Considerations and Practical Solutions -- The Partition Functions of PI, P7, and F Miniplasmids -- Genetic Interactions of Broad Host-Range Plasmid RK2: Evidence for a Complex Replication Regulon -- Replication Determinants of the Broad Host Range Plasmid RSF1010 -- Regulation of Replication and Maintenance Functions of Broad Host-Range Plasmid RK2 -- Control of Chromosome Replication in Bacteria -- Stable Maintenance of Plasmid CLO DF13: Structural and Functional Relationships Between Replication, Control, Partitioning, and Incompatibility -- Replication Control for PT181, An Indirectly Regulated Plasmid -- Construction of ColE1 RNA1 Mutants and Analysis of their Function In Vivo -- Incompatibility and INCFII Plasmid Replication Control -- P1 Plasmid Maintenance: A Paradigm of Precise Control -- Partitioning of the pSC101 Plasmid During Cell Division -- DNA-Protein Interaction at the Replication Origins of Plasmid Chromosomes -- Positive Regulation and Transcription Initiation of xy1 Operons on TOL Plasmid -- Plasmid Transfer -- Chairmen's Introduction: Plasmid Transfer -- Linear Plasmids with Terminal Inverted Repeats Obtained from Streptomycesrochei and Kluyveromyceslactis -- Conjugal Plasmid Transfer in BacillusThuringiensis -- Mechanisms Essential for Stable Inheritance of Mini-F Plasmid -- Sex Pheromones and Plasmid Transfer in StreptococcusFaecalis: A Pheromone, cAM373, Which is Also Excreted by StaphylococcusAureus -- General Genetic Recombination of Bacterial Plasmids -- The Origin of Plasmid DNA Transfer During Bacterial Conjugation -- Genes and Gene Products Involved in the Synthesis of F-PILI -- Genetics of Clindamycin Resistance in Bacteroides -- Effect of Chromosome Homology of Plasmid Transformation and Plasmid Conjugal Transfer in Haemophilus Influenzae -- Plasmid DNA Primases and Their Role in Bacterial Conjugation -- Promoters in the Transfer Region of Plasmid F -- Conjugative Sex Plasmids of Streptomyces -- Specialized Functions, Structure, and Evolution -- The Structure and Source of Plasmid DNA Determine the Cloning Properties of Vectors for BacillusSubtilis -- Shuttle Vector for EscherichiaColi, PseudomonasPutida, and PseudomonasAeruginosa -- Report on a Workshop: Plasmid Cloning Vehicles -- Plasmids in the Degradation of Chlorinated Aromatic Compounds -- Notes on Metabolic Plasmid Organization and Expression -- The Structure of the mer Operon -- Analysis and Manipulation of Plasmid-Encoded Pathways for the Catabolism of Aromatic Compounds by Soil Bacteria -- The Plasmid-Specified Aerobactin Iron Uptake System of EscherichiaColi -- Plasmid-Mediated Iron Sequestering Systems in Pathogenic Strains of Vibrioanguillarum and EscherichiaColi -- Chairman's Introduction: Specialized Functions -- Cloning of an Enzymatically Active Segment of the Exotoxin-A Gene of PseudomonasAeruginosa Ill -- Structure, Function, and Regulation of the Plasmid-Encoded Hemolysin Determinant of EscherichiaColi -- pIAA, A Virulence Plasmid in PseudomonasSavastanoi -- The Molecular Basis of Plant Cell Transformation by AgrobacteriumTumefaciens -- Post-Transcriptional Regulation of Chloramphenicol Acetyl Transferase -- Plasmid and Larval Toxin of Bacilluslaterosporus -- Posters (Poster abstracts have been reproduced as submitted) -- Replication, Incompatibility, Partition -- Specialized Functions -- Structure and Evolution -- Transfer -- Vectors -- Rosters -- Speakers -- Participants -- Index of Poster Authors