1. Editorial

   • Albert Balows

   EditorialNotes Pages: 1 - 1

2. Occurrence of heterogeneous R-plasmids during two concurrent epidemics due to multidrug-resistantSalmonella oranienburg

   • Prem L. Sharma
   • K. B. Sharma

   OriginalPaper Pages: 3 - 6

3. Detection and characterization of the tetracycline resistance determinant, tetM, inHaemophilus ducreyi

   • Steven R. Johnson
   • James W. Biddle
   • Wallis E. DeWitt

   OriginalPaper Pages: 7 - 12

4. Plasmid screening in thermophilicBacillus: Physical characterization and molecular cloning

   • Edda De Rossi
   • Patrizia Brigidi
   • Diego Matteuzzi

   OriginalPaper Pages: 13 - 19

5. Comparison of adherence properties ofEscherichia coli 0157:H7 and a 60-megadalton plasmid-cured derivative

   • Alan D. Junkins
   • Michael P. Doyle

   OriginalPaper Pages: 21 - 27

6. Comparison of soluble and membrane polypeptides ofSynechocystis 6308 by two-dimensional electrophoresis

   • Clifford S. Duke
   • Mary M. Allen

   OriginalPaper Pages: 29 - 34

7. Similarities among nitrogenase proteins and amongnif-HDK genes ofMethanosarcina barkeri and of other diazotrophic bacteria

   • Martin Bomar
   • Jo Hermans
   • Alexander J. B. Zehnder

   OriginalPaper Pages: 35 - 38

8. Oxygen tolerance of anaerobic bacteria isolated from human feces

   • Tullio Brusa
   • Enrica Canzi
   • Annamaria Ferrari

   OriginalPaper Pages: 39 - 43

9. Membrane fractionation based on functional composition: Evidence for membrane domains

   • Charles R. Myers
   • Mary Lynne Perille Collins

   OriginalPaper Pages: 45 - 51

10. Pathogenicity of cultivatedDrosophila willistoni spiroplasmas

    • David L. Williamson
    • Kevin J. Hackett
    • Arthur J. Cohen

    OriginalPaper Pages: 53 - 56

11. Differences between magnesium- and manganese-activated pyruvate kinase fromThiobacillus versutus (A2)

    • David P. Klein
    • A. Michael Charles

    OriginalPaper Pages: 57 - 60

12. Induction of error-free DNA repair inEscherichia coli by heat shock or nutritional stress

    • Peter S. Fitt
    • Nishi Sharma

    OriginalPaper Pages: 61 - 65

13. Nucleotide sequence of the common plasmid ofChlamydia trachomatis serovar L₂: Use of compatible deletions to generate overlapping fragments

    • Carolyn M. Black
    • Robert C. Barnes
    • Leonard W. Mayer

    OriginalPaper Pages: 67 - 74