• Bahl MI, Hansen LH, Goesmann A & Sørensen SJ (2007a) The multiple antibiotic resistance IncP-1 plasmid pKJK5 isolated from a soil environment is phylogenetically divergent from members of the previously established alpha, beta and delta sub-groups. Plasmid 58: 3143.
  • Bahl MI, Hansen LH & Sørensen SJ (2007b) Impact of conjugal transfer on the stability of IncP-1 plasmid pKJK5 in bacterial populations. FEMS Microbiol Lett 266: 250256.
  • Benoit MR, Conant CG, Ionescu-Zanetti C, Schwartz M & Matin A (2010) New device for high-throughput viability screening of flow biofilms. Appl Environ Microbiol 76: 41364142.
  • Burmølle M, Hansen LH & Sørensen SJ (2005) Use of a whole-cell biosensor and flow cytometry to detect AHL production by an indigenous soil community during decomposition of litter. Microb Ecol 50: 221229.
  • Burmølle M, Webb J, Rao D, Hansen L, Sørensen S & Kjelleberg S (2006) Enhanced biofilm formation and increased resistance to antimicrobial agents and bacterial invasion are caused by synergistic interactions in multispecies biofilms. Appl Environ Microbiol 72: 39163923.
  • Burmølle M, Bahl M, Jensen L, Sørensen S & Hansen L (2008) Type 3 fimbriae, encoded by the conjugative plasmid pOLA52, enhance biofilm formation and transfer frequencies in Enterobacteriaceae strains. Microbiology 154: 187195.
  • Burmølle M, Norman A, Sørensen SJ & Hansen LH (2012) Sequencing of IncX-plasmids suggests ubiquity of mobile forms of a biofilm-promoting gene cassette recruited from Klebsiella pneumoniae. PLoS ONE 7: e41259.
  • Ceri H, Olson M, Stremick C, Read R, Morck D & Buret A (1999) The Calgary Biofilm Device: new technology for rapid determination of antibiotic susceptibilities of bacterial biofilms. J Clin Microbiol 37: 17711776.
  • Cowan SE, Gilbert E, Liepmann D & Keasling JD (2000) Commensal interactions in a dual-species biofilm exposed to mixed organic compounds. Appl Environ Microbiol 66: 44814485.
  • Datta N, Hedges RW, Shaw EJ, Sykes RB & Richmond MH (1971) Properties of an R factor from Pseudomonas aeruginosa. J Bacteriol 108: 12441249.
  • de la Cruz-Perera CI, Ren D, Blanchet M, Dendooven L, Marsch R, Sørensen SJ & Burmølle M (2013) The ability of soil bacteria to receive the conjugative IncP1 plasmid, pKJK10, is different in a mixed community compared to single strains. FEMS Microbiol Lett 338: 95100.
  • de Lipthay JR, Barkay T & Sørensen SJ (2000) Enhanced degradation of phenoxyacetic acid in soil by horizontal transfer of the tfdA gene encoding a 2,4-dichlorophenoxyacetic acid dioxygenase. FEMS Microbiol Lett 1: 7584.
  • de Lorenzo V & Timmis KN (1994) Analysis and construction of stable phenotypes in gram-negative bacteria with Tn5- and Tn10-derived minitransposons. Methods Enzymol 235: 386405.
  • Ghigo J (2001) Natural conjugative plasmids induce bacterial biofilm development. Nature 412: 442445.
  • Haase J & Lanka E (1997) A specific protease encoded by the conjugative DNA transfer systems of IncP and Ti plasmids is essential for pilus synthesis. J Bacteriol 179: 57285735.
  • Hansen LH, Knudsen S & Sørensen SJ (1998) The effect of the lacY gene on the induction of IPTG inducible promoters, studied in Escherichia coli and Pseudomonas fluorescens. Curr Microbiol 36: 341347.
  • Jefferson K (2004) What drives bacteria to produce a biofilm? FEMS Microbiol Lett 236: 163173.
  • Madsen JS, Burmølle M, Hansen LH & Sørensen SJ (2012) The interconnection between biofilm formation and horizontal gene transfer. FEMS Immunol Med Microbiol 65: 183195.
  • May T & Okabe S (2008) Escherichia coli harboring a natural IncF conjugative F plasmid develops complex mature biofilms by stimulating synthesis of colanic acid and Curli. J Bacteriol 190: 74797490.
  • O'Toole GA & Kolter R (1998) Initiation of biofilm formation in Pseudomonas fluorescens WCS365 proceeds via multiple, convergent signalling pathways: a genetic analysis. Mol Microbiol 28: 449461.
  • Reisner A, Höller B, Molin S & Zechner E (2006) Synergistic effects in mixed Escherichia coli biofilms: conjugative plasmid transfer drives biofilm expansion. J Bacteriol 188: 35823588.
  • Sambrook J, Fritsch EF & Maniatis T (1989) Molecular Cloning: A Laboratory Manual, 2nd edn. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY.
  • Sengeløv G, Kristensen KJ, Sørensen AH, Kroer N & Sørensen SJ (2001) Effect of genomic location on horizontal transfer of a recombinant gene cassette between Pseudomonas strains in the rhizosphere and spermosphere of Barley seedlings. Curr Microbiol 42: 160167.
  • Sørensen S, Bailey M, Hansen L, Kroer N & Wuertz S (2005) Studying plasmid horizontal transfer in situ: a critical review. Nat Rev Microbiol 3: 700710.
  • Sutherland IW (2001) Biofilm exopolysaccharides: a strong and sticky framework. Microbiology 147: 39.
  • Thomas C & Nielsen K (2005) Mechanisms of, and barriers to, horizontal gene transfer between bacteria. Nat Rev Microbiol 3: 711721.