title: Then and now.
mesh_terms: D001419:Bacteria / Q000378:metabolism; D001671:Biochemistry / Q000266:history*; D002244:Carbon / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism; D049673:History, 20th Century; D014495:Universities / Q000266:history
chemical_list: D002245:Carbon Dioxide; D002244:Carbon