title: Cell-surface hydrophobicity and scum formation of Rhodococcus rhodochrous strains with different colonial morphologies.
abstract: Rhodococcus rhodochrous has been reported to be one of the micro-organisms responsible for the formation of scum which is thick and viscous biological foam in activated sludge plants. The hydrophobicity of mycolic acids present on the cell surface and the long-branched shape of the hyphae have been thought to contribute to the scum formation. Cell surface hydrophobicity and scum formation of four R. rhodochrous strains with different colony morphologies were determined, and the results showed that the two rough strains had strong cell surface hydrophobicity and produced scum, whereas the weakly hydrophobic smooth strain and the hydrophilic mucoidal strain did not. All four strains displayed long, branched hyphae, and their electrophoretic mobilities were similar, between pH 4 and 9. These data suggest that changes in the cell surface hydrophobicity of the R. rhodochrous result in changes in the culture characteristics and the formation of scum.
authors.affiliation: Laboratory of Molecular Microbiology, Department of Applied Biological Science, College of Bioresource Sciences, Nihon University, Fujisawa, Kanagawa, Japan. sunairi@brs.nihon-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Sunairi
authors.forename: N
authors.initials: N
authors.lastname: Iwabuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshizawa
authors.forename: H
authors.initials: H
authors.lastname: Murooka
authors.forename: H
authors.initials: H
authors.lastname: Morisaki
authors.forename: M
authors.initials: M
authors.lastname: Nakajima
mesh_terms: D001422:Bacterial Adhesion; D057927:Hydrophobic and Hydrophilic Interactions; D008562:Membrane Glycoproteins / Q000737:chemistry; D009171:Mycolic Acids / Q000032:analysis* / Q000737:chemistry*; D012240:Rhodococcus / Q000737:chemistry* / Q000302:isolation & purification / Q000502:physiology; D012722:Sewage / Q000382:microbiology*
chemical_list: D008562:Membrane Glycoproteins; D009171:Mycolic Acids; D012722:Sewage