Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

My NCBI Filters
Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
2002 1
2005 1
2006 2
2007 3
2008 1
2009 4
2010 3
2011 1
2012 3
2013 3
2014 2
2015 2
2016 6
2017 2
2018 1
2019 1
2020 1
2021 9
2022 3
2023 0
Text availability
Article attribute
Article type
Publication date

Search Results

46 results
Results by year
Filters applied: . Clear all
Page 1
Bacterial evolution on demand.
Johnsen PJ, Gama JA, Harms K. Johnsen PJ, et al. Elife. 2021 Apr 6;10:e68070. doi: 10.7554/eLife.68070. Elife. 2021. PMID: 33820602 Free PMC article.
Evolution of β-lactamase-mediated cefiderocol resistance.
Fröhlich C, Sørum V, Tokuriki N, Johnsen PJ, Samuelsen Ø. Fröhlich C, et al. Among authors: johnsen pj. J Antimicrob Chemother. 2022 Aug 25;77(9):2429-2436. doi: 10.1093/jac/dkac221. J Antimicrob Chemother. 2022. PMID: 35815680 Free PMC article.
Strong pathogen competition in neonatal gut colonisation.
Mäklin T, Thorpe HA, Pöntinen AK, Gladstone RA, Shao Y, Pesonen M, McNally A, Johnsen PJ, Samuelsen Ø, Lawley TD, Honkela A, Corander J. Mäklin T, et al. Among authors: johnsen pj. Nat Commun. 2022 Dec 1;13(1):7417. doi: 10.1038/s41467-022-35178-5. Nat Commun. 2022. PMID: 36456554 Free PMC article.
Release and persistence of extracellular DNA in the environment.
Nielsen KM, Johnsen PJ, Bensasson D, Daffonchio D. Nielsen KM, et al. Among authors: johnsen pj. Environ Biosafety Res. 2007 Jan-Jun;6(1-2):37-53. doi: 10.1051/ebr:2007031. Epub 2007 Sep 12. Environ Biosafety Res. 2007. PMID: 17961479 Free article. Review.
The chemotherapeutic drug methotrexate selects for antibiotic resistance.
Guðmundsdóttir JS, Fredheim EGA, Koumans CIM, Hegstad J, Tang PC, Andersson DI, Samuelsen Ø, Johnsen PJ. Guðmundsdóttir JS, et al. Among authors: johnsen pj. EBioMedicine. 2021 Dec;74:103742. doi: 10.1016/j.ebiom.2021.103742. Epub 2021 Dec 11. EBioMedicine. 2021. PMID: 34902789 Free PMC article.
Cryptic β-Lactamase Evolution Is Driven by Low β-Lactam Concentrations.
Fröhlich C, Gama JA, Harms K, Hirvonen VHA, Lund BA, van der Kamp MW, Johnsen PJ, Samuelsen Ø, Leiros HS. Fröhlich C, et al. Among authors: johnsen pj. mSphere. 2021 Apr 28;6(2):e00108-21. doi: 10.1128/mSphere.00108-21. mSphere. 2021. PMID: 33910990 Free PMC article.
46 results