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Pål Johnsen

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Irina Starikova; Ørjan Samuelsen; Klaus Harms; Pål Haugen; Tracy T M Lunde; Kaare M Nielsen; Raul Primicerio; Pål J Johnsen
A trade-off between the fitness cost of functional integrases and long-term stability of integrons.
Sara Domingues; W. Florian Fricke; Klaus Harms; Pål J Johnsen; Gabriela J Da Silva; Kaare Magne Nielsen
Natural transformation facilitates transfer of transposons, integrons and gene cassettes between bacterial species.
Pål J Johnsen; Jeffrey Townsend; T Bøhn; Gunnar S Simonsen; Arnfinn Sundsfjord; Kaare M Nielsen
Retrospective evidence for a biological cost of vancomycin resistance determinants in the absence of glycopeptide selective pressures.

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2012: Irina Starikova; Ørjan Samuelsen; Klaus Harms; Pål Haugen; Tracy T M Lunde; Kaare M Nielsen; Raul Primicerio; Pål J Johnsen
A trade-off between the fitness cost of functional integrases and long-term stability of integrons.
PLoS pathogens 2012;8(11):e1003043.
2012: Sara Domingues; W. Florian Fricke; Klaus Harms; Pål J Johnsen; Gabriela J Da Silva; Kaare Magne Nielsen
Natural transformation facilitates transfer of transposons, integrons and gene cassettes between bacterial species.
PLoS pathogens 2012;8(8):e1002837.
2011: Pål J Johnsen; Jeffrey Townsend; T Bøhn; Gunnar S Simonsen; Arnfinn Sundsfjord; Kaare M Nielsen
Retrospective evidence for a biological cost of vancomycin resistance determinants in the absence of glycopeptide selective pressures.
The Journal of antimicrobial chemotherapy 2011;66(3):608-10.
2010: H Sletvold; Pål J Johnsen; Odd-Gunnar Wikmark; Gunnar S Simonsen; Arnfinn Sundsfjord; Kaare M Nielsen
Tn1546 is part of a larger plasmid-encoded genetic unit horizontally disseminated among clonal Enterococcus faecium lineages.
The Journal of antimicrobial chemotherapy 2010;65(9):1894-906.
2010: Pål J Johnsen; Bruce R Levin
Adjusting to alien genes.
Molecular microbiology 2010;75(5):1061-3.
2010: Torill C S Rosvoll; Torunn Pedersen; Hege Sletvold; Pål J Johnsen; Johanna E Sollid; Gunnar S Simonsen; Lars B Jensen; Kaare M Nielsen; Arnfinn Sundsfjord
PCR-based plasmid typing in Enterococcus faecium strains reveals widely distributed pRE25-, pRUM-, pIP501- and pHTbeta-related replicons associated with glycopeptide resistance and stabilizing toxin-antitoxin systems.
FEMS immunology and medical microbiology 2010;58(2):254-68.
2009: Jessica L Ray; Klaus Harms; Odd-Gunnar Wikmark; Irina Starikova; Pål J Johnsen; Kaare M Nielsen
Sexual isolation in Acinetobacter baylyi is locus-specific and varies 10,000-fold over the genome.
Genetics 2009;182(4):1165-81.
2009: Pål J Johnsen; Jeffrey Townsend; Thomas Bøhn; Gunnar S Simonsen; Arnfinn Sundsfjord; Kaare M Nielsen
Factors affecting the reversal of antimicrobial-drug resistance.
The Lancet infectious diseases 2009;9(6):357-64.
2008: H Sletvold; Pål J Johnsen; I Hamre; Gunnar S Simonsen; Arnfinn Sundsfjord; Kaare M Nielsen
Complete sequence of Enterococcus faecium pVEF3 and the detection of an omega-epsilon-zeta toxin-antitoxin module and an ABC transporter.
Plasmid 2008;60(1):75-85.
2007: Kristin H Dahl; Denis Mater; María José Flores; Pål J Johnsen; Tore Midtvedt; Gérard Corthier; Arnfinn Sundsfjord
Transfer of plasmid and chromosomal glycopeptide resistance determinants occurs more readily in the digestive tract of mice than in vitro and exconjugants can persist stably in vivo in the absence of glycopeptide selection.
The Journal of antimicrobial chemotherapy 2007;59(3):478-86.
2007: H Sletvold; Pål J Johnsen; Gunnar S Simonsen; B Aasnaes; Arnfinn Sundsfjord; Kaare M Nielsen
Comparative DNA analysis of two vanA plasmids from Enterococcus faecium strains isolated from poultry and a poultry farmer in Norway.
Antimicrobial agents and chemotherapy 2007;51(2):736-9.
2007: Kaare M Nielsen; Pål J Johnsen; Douda Bensasson; Daniele Daffonchio
Release and persistence of extracellular DNA in the environment.
Environmental biosafety research 2007;6(1-2):37-53.
2006: Marit Sørum; Pål J Johnsen; B Aasnes; T Rosvoll; Hilde Kruse; Arnfinn Sundsfjord; Gunnar S Simonsen
Prevalence, persistence, and molecular characterization of glycopeptide-resistant enterococci in Norwegian poultry and poultry farmers 3 to 8 years after the ban on avoparcin.
Applied and environmental microbiology 2006;72(1):516-21.
2005: Pål J Johnsen; J I Østerhus; H Sletvold; Marit Sørum; Hilde Kruse; K Nielsen; Gunnar S Simonsen; Arnfinn Sundsfjord
Persistence of animal and human glycopeptide-resistant enterococci on two Norwegian poultry farms formerly exposed to avoparcin is associated with a widespread plasmid-mediated vanA element within a polyclonal enterococcus faecium population.
Applied and environmental microbiology 2005;71(1):159-68.
2002: Pål J Johnsen; Gunnar S Simonsen; Orjan Olsvik; Tore Midtvedt; Arnfinn Sundsfjord
Stability, persistence, and evolution of plasmid-encoded VanA glycopeptide resistance in enterococci in the absence of antibiotic selection in vitro and in gnotobiotic mice.
Microbial drug resistance (Larchmont, N.Y.) 2002;8(3):161-70.