Author

Leiv Sigve Håvarstein

Norwegian University of Life SciencesORCID 0000-0001-8250-4322Unclaimed ORCID profile · follow to get notified of new preprints

Biology Disciplines

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Microbiology· 2

Signature Assays, Organisms & Methods

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Organism:bacteria (other)· 2 Approach:experimental assay· 2 Research Focus:host-pathogen & immune response· 2

Frequent Co-Authors

Daniel StraumeiD· 2 shared Morten KjosiD· 2 shared Anja Ruud WintheriD· 1 shared Johanne Moldstad· 1 shared Katarzyna Wiaroslawa Piechowiak· 1 shared Maria Victoria Heggenhougen· 1 shared Ragnhild Sødal Gjennestad· 1 shared Rebekka Moe· 1 shared

Activity by Year

2025-2026 · peak 1/yr

Co-Author Collaboration Network

9 top collaborators · 26 mutual co-author links

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2 shared papersMicrobiology

Daniel StraumeORCID

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2 papers

Recent·Most cited

MicrobiologyJournal of BacteriologyPeer-reviewedApr 22, 2026

LytF contributes to pilus extrusion during natural competence in Streptococcus sanguinis SK36.

Rebekka Moe, Katarzyna Wiaroslawa Piechowiak, Leiv Sigve Håvarstein…·Daniel Straume

This study shows that LytF promotes pilus extrusion in Streptococcus sanguinis, enhancing DNA uptake during natural transformation, contrary to previous speculation that it functions as a fratricin.

2 citationstop 5%

bacteria (other)experimental assay

𝕏 PostBluesky

MicrobiologyJournal of BacteriologyPeer-reviewedOct 8, 2025

The effect of MurM and a branched cell wall structure on penicillin resistance in Streptococcus pneumoniae

Ragnhild Sødal Gjennestad, Maria Victoria Heggenhougen, Anja Ruud Winther…·Daniel Straume

This study investigates the role of MurM and branched cell wall structures in penicillin resistance in Streptococcus pneumoniae, finding no direct correlation between increased branching and resistance.

1 citation

bacteria (other)experimental assay

𝕏 PostBluesky