title: Preface.
mesh_terms: D001419:Bacteria / Q000201:enzymology*; D000460:Chlorophyta / Q000201:enzymology*; D006420:Hemeproteins / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D003226:Congresses as Topic
chemical_list: D006420:Hemeproteins; D010100:Oxygen