RT Journal Article SR Electronic(1) A1 MEYER, David J. A1 JONES, Colin W.YR 1973 T1 Distribution of Cytochromes in Bacteria: Relationship to General Physiology JF International Journal of Systematic and Evolutionary Microbiology, VO 23 IS 4 SP 459 OP 467 DO https://doi.org/10.1099/00207713-23-4-459 PB Microbiology Society, SN 1466-5034, AB A review of cytochrome occurrence in bacteria is presented which gives the taxonomic distribution of cytochromes and which relates this to general physiological characteristics. Data obtained from published research and recent experimental studies on a total of 169 species of bacteria suggested the existence of four major groupings: (i) the aerobic and facultatively anaerobic, heterotrophic gram positives (cytochrome pattern aa 3.o.b.c); (ii) the aerobic and facultatively anaerobic, heterotrophic gram negatives (cytochrome pattern either a 1.d.o.b.c, a 1.o.b.c or aa 3.o.b.c); (iii) anaerobic and microaerophilic hetero-trophs (cytochrome pattern b sometimes with a 1 /d/o), and (iv) the ch'emo- and photo-autotrophs (cytochrome pattern c plus a 1 /aa 3 /o/b). The absence or minor presence of cytochrome c in facultatively anaerobic and anaerobic heterotrophs was confirmed and was also observed in plant and animal pathogens. Cytochrome d was confined in occurrence mainly to a small taxonomic group of organisms characterized by a high degree of adaptability to unstable habitats. This group was considered for further subdivision dependent upon the conditions causing the production of cytochrome d., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/00207713-23-4-459