<P>Editorial. Preface. Color Plates. <STRONG>1.</STRONG> Evolution and Phylogenic Analysis of Respiration; <EM>J. Castresana.</EM> <STRONG>2.</STRONG> NADH Dehydrogenase (NADH-Quinone Oxidoreductase); <EM>T. Yagi, S.</EM> <EM>Di Bernardo, E. Nakamaru-Ogiso, Mou-Chieh Kao, Byoung Boo Seo, A.</EM> <EM>Matsuno-Yagi.</EM> <STRONG>3.</STRONG> Bacterial Hydroquinone: Cytochrome <EM>c</EM> Oxidoreductases, Physiology, Structure and Function; <EM>J.W. Cooley, E.</EM> <EM>Darrouzet, F. Daldal.</EM> <STRONG>4.</STRONG> Structure and Function of Succinate:Quinone Oxidoreductases and the Role of Quinol:Fumarate Reductases in Fumarate Respiration; <EM>C.R.D. Lancaster.</EM> <STRONG>5.</STRONG> Biochemical and Molecular Features of Terminal Oxidases; <EM>J. Sakamoto,</EM> <EM>N. Sone.</EM> <STRONG>6.</STRONG> Structures of Bacterial Heme-Copper Oxidases; <EM>J.</EM> <EM>Abramson, T. Shimamura, S. Iwata.</EM> <STRONG>7.</STRONG> Functional Aspects of Heme-Copper Terminal Oxidases; <EM>P. Brzezinski, G. Larsson, P.</EM> <EM>Ädelroth.</EM> <STRONG>8.</STRONG> The Na+- Translocating NADH-Quinone Reductase of Marine and Moderately Halophilic Bacteria; <EM>M. Hayashi, T. Unemoto.</EM> <STRONG>9.</STRONG> Microbial Molybdenum-Containing Enzymes in Respiration: Structural and Functional Aspects; <EM>A.G. McEwan, U. Kappler, C.A.</EM> <EM>McDevitt.</EM> <STRONG>10.</STRONG> The Pyrroloquinoline Quinone (PPQ)-Containing Dehydrogenases; <EM>C. Anthony.</EM> <STRONG>11.</STRONG> Biogenesis of Cytochrome <EM>c</EM>; <EM>E.</EM> <EM>Enggist, L. Thöny-Meyer.</EM> <STRONG>12.</STRONG> Bacterial Hemoglobins: Old Proteins with 'New' Functions? Roles in Respiratory and Nitric Oxide Metabolism; <EM>Guanghui Wu, L.M. Wainwright, J.</EM> <EM>Membrillo-Hernández, R.K. Poole.</EM> <STRONG>13.</STRONG> Oxidases as Redox Sensors in Pigment Synthesis; <EM>Jeon-Il Oh, S. Kaplan.</EM> Subject Index. Species Index. Gene and Gene Product Index. </P>