title: Effect of CO2 on colony development by Bifidobacterium species.
abstract: This report investigates the requirement for CO2 for colony formation by Bifidobacterium species in both anoxic and oxic environments. All tested Bifidobacterium species exhibited difficulty in developing colonies in an atmosphere of 100% N2 but developed well when 1% CO2 was present. In the presence of CO2, the oxygen tolerance of the tested species was not improved. In the absence of CO2, only B. boum, a microaerophilic species, could develop colonies under an N2-based 5% O2 atmosphere, indicating that while CO2 is not an essential factor for colony development, both CO2 and O2 have stimulatory effects on B. boum colony development.
authors.affiliation: Department of Biosciences, Tokyo University of Agriculture, 1-1-1 Setagaya-ku, Tokyo 156-8502, Japan. kawashin@nodai.ac.jp
authors.forename: Shinji
authors.initials: S
authors.lastname: Kawasaki
authors.forename: Masahiro
authors.initials: M
authors.lastname: Nagasaku
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Mimura
authors.forename: Hitomi
authors.initials: H
authors.lastname: Katashima
authors.forename: Susumu
authors.initials: S
authors.lastname: Ijyuin
authors.forename: Takumi
authors.initials: T
authors.lastname: Satoh
authors.forename: Youichi
authors.initials: Y
authors.lastname: Niimura
mesh_terms: D001644:Bifidobacterium / Q000166:cytology / Q000187:drug effects* / Q000254:growth & development*; D002245:Carbon Dioxide / Q000494:pharmacology*; D009584:Nitrogen / Q000494:pharmacology; D010100:Oxygen / Q000494:pharmacology
chemical_list: D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen