This study was supported in part by the Office of Water Resources Research, U.S. Department of the Interior under Project A-027-OHIO.(print) vii, 133 p. : ill. ; 29 cm.Table of Contents -- List of Tables -- List of Figures -- 1. Introduction -- 2. Review of the Literature -- 3. Mixed Culture Growth Studies -- 4. Pure Culture Growth Studies -- 5. Morphology of Methane Oxidizing Bacteria -- 6. Isolation of Intracytoplasmic Membranes -- 7. Lipids of Cells and Membranes -- 8. Proteins of Cells and Membranes -- 9. Summary -- 10. Conclusions and Recommendation