World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
52
Citations
14396
World Ranking
16488
National Ranking
86

Leiv Sigve Håvarstein publication distribution in Biology and Biochemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Biology and Biochemistry in 2026. The highlighted bar marks where Leiv Sigve Håvarstein sits on this spectrum.

47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 414 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 849 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 950 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 841 scientists 207–216 publications: 735 scientists 217–226 publications: 709 scientists 227–236 publications: 651 scientists 237–246 publications: 605 scientists 247–256 publications: 510 scientists 257–266 publications: 524 scientists 267–276 publications: 434 scientists 277–286 publications: 418 scientists 287–296 publications: 350 scientists 297–306 publications: 363 scientists 307–316 publications: 315 scientists 317–326 publications: 296 scientists 327–336 publications: 261 scientists 337–346 publications: 240 scientists 347–356 publications: 219 scientists 357–366 publications: 197 scientists 367–376 publications: 154 scientists 377–386 publications: 161 scientists 387–396 publications: 155 scientists 397–406 publications: 145 scientists 407–416 publications: 124 scientists 417–426 publications: 112 scientists 427–436 publications: 132 scientists 437–446 publications: 116 scientists 447–456 publications: 99 scientists 457–466 publications: 81 scientists 467–476 publications: 91 scientists 477–486 publications: 80 scientists 487–496 publications: 80 scientists 497–506 publications: 60 scientists 507–516 publications: 36 scientists 517–526 publications: 46 scientists 527–536 publications: 54 scientists 537–546 publications: 44 scientists 547–556 publications: 43 scientists 557–566 publications: 43 scientists 567–576 publications: 42 scientists 577–586 publications: 25 scientists 587–596 publications: 34 scientists 597–606 publications: 23 scientists 607–616 publications: 33 scientists 617–626 publications: 31 scientists 627–636 publications: 27 scientists 637–646 publications: 25 scientists 647–656 publications: 28 scientists 657–666 publications: 34 scientists 667–676 publications: 18 scientists 677–686 publications: 16 scientists 687–696 publications: 10 scientists 697–706 publications: 12 scientists 707–716 publications: 21 scientists 717–726 publications: 12 scientists 727–736 publications: 12 scientists 737–746 publications: 10 scientists 747–756 publications: 7 scientists 757–766 publications: 13 scientists 767–776 publications: 15 scientists 777–786 publications: 13 scientists 787–796 publications: 9 scientists 797–806 publications: 9 scientists 807–816 publications: 7 scientists 817–826 publications: 4 scientists 827–836 publications: 9 scientists 837–846 publications: 7 scientists 847–856 publications: 3 scientists 857–866 publications: 5 scientists 867–876 publications: 5 scientists 877–886 publications: 11 scientists 887–896 publications: 3 scientists 897–906 publications: 4 scientists 907–916 publications: 7 scientists 917–926 publications: 5 scientists 927–936 publications: 6 scientists 937–946 publications: 6 scientists 947–956 publications: 3 scientists 957–966 publications: 7 scientists 967–976 publications: 2 scientists 977–986 publications: 2 scientists 987–996 publications: 1 scientists 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientists 1,028+ publications: 100 scientists
47 publications 1,028+

This scientist: 107 publications — 7th percentile

7% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,028 publications or more.

Leiv Sigve Håvarstein D-index placement in Biology and Biochemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Biology and Biochemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Leiv Sigve Håvarstein sits on this spectrum.

40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 317 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 900 scientists 52–53 D-Index: 1,026 scientists 54–55 D-Index: 1,150 scientists 56–57 D-Index: 1,236 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,163 scientists 62–63 D-Index: 1,131 scientists 64–65 D-Index: 1,032 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 715 scientists 72–73 D-Index: 709 scientists 74–75 D-Index: 596 scientists 76–77 D-Index: 512 scientists 78–79 D-Index: 473 scientists 80–81 D-Index: 412 scientists 82–83 D-Index: 373 scientists 84–85 D-Index: 358 scientists 86–87 D-Index: 285 scientists 88–89 D-Index: 273 scientists 90–91 D-Index: 227 scientists 92–93 D-Index: 208 scientists 94–95 D-Index: 193 scientists 96–97 D-Index: 153 scientists 98–99 D-Index: 157 scientists 100–101 D-Index: 148 scientists 102–103 D-Index: 120 scientists 104–105 D-Index: 113 scientists 106–107 D-Index: 100 scientists 108–109 D-Index: 86 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 72 scientists 114–115 D-Index: 73 scientists 116–117 D-Index: 64 scientists 118–119 D-Index: 53 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 54 scientists 124–125 D-Index: 43 scientists 126–127 D-Index: 38 scientists 128–129 D-Index: 49 scientists 130–131 D-Index: 26 scientists 132–133 D-Index: 18 scientists 134–135 D-Index: 23 scientists 136–137 D-Index: 32 scientists 138–139 D-Index: 32 scientists 140–141 D-Index: 27 scientists 142–143 D-Index: 19 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 12 scientists 148–149 D-Index: 16 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 10 scientists 154–155 D-Index: 13 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 9 scientists 162–163 D-Index: 13 scientists 164–165 D-Index: 4 scientists 166 D-Index: 4 scientists 167+ D-Index: 98 scientists
40 D-Index 167+

This scientist: 52 D-Index — 16th percentile

16% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 167 D-Index or more.

Overview

What is he best known for?

The fields of study he is best known for:

  • Gene
  • DNA
  • Enzyme

Leiv Sigve Håvarstein focuses on Bacteriocin, Biochemistry, Peptide sequence, Amino acid and Genetics. His study in Bacteriocin is interdisciplinary in nature, drawing from both Open reading frame, Peptide and Lactic acid. His Biochemistry research includes themes of Lantibiotics, Microbiology and Bacteria.

His research investigates the connection with Microbiology and areas like Nucleic acid sequence which intersect with concerns in Antibacterial agent. Leiv Sigve Håvarstein is studying Edman degradation, which is a component of Peptide sequence. His works in Gene, DNA Transformation Competence, Transformation, Histidine kinase and Operon are all subjects of inquiry into Genetics.

His most cited work include:

  • Biosynthesis of bacteriocins in lactic acid bacteria (697 citations)
  • An unmodified heptadecapeptide pheromone induces competence for genetic transformation in Streptococcus pneumoniae (632 citations)
  • A family of bacteriocin ABC transporters carry out proteolytic processing of their substrates concomitant with export (498 citations)

What are the main themes of his work throughout his whole career to date?

Leiv Sigve Håvarstein mainly investigates Microbiology, Biochemistry, Streptococcus pneumoniae, Gene and Genetics. His research in Microbiology focuses on subjects like Lysis, which are connected to Naked DNA. He regularly links together related areas like Bacteriocin in his Biochemistry studies.

His Bacteriocin research includes elements of Consensus sequence, Edman degradation and Peptide. His Streptococcus pneumoniae research focuses on Mutant and how it connects with Transcription. Leiv Sigve Håvarstein works mostly in the field of Peptide sequence, limiting it down to topics relating to Nucleic acid sequence and, in certain cases, Antibacterial agent.

He most often published in these fields:

  • Microbiology (37.04%)
  • Biochemistry (33.33%)
  • Streptococcus pneumoniae (29.63%)

What were the highlights of his more recent work (between 2017-2021)?

  • Peptidoglycan (22.22%)
  • Cell biology (22.22%)
  • Cell division (14.81%)

In recent papers he was focusing on the following fields of study:

The scientist’s investigation covers issues in Peptidoglycan, Cell biology, Cell division, Bacterial cell structure and Cell. His research integrates issues of Streptococcus pneumoniae and Function in his study of Peptidoglycan. In the field of Microbiology and Bacteria Leiv Sigve Håvarstein studies Streptococcus pneumoniae.

His work carried out in the field of Cell biology brings together such families of science as Tyrosine, FtsZ and Site-directed mutagenesis. The study incorporates disciplines such as CRISPR interference and Gene in addition to Cell division. His Bacterial cell structure research is multidisciplinary, incorporating perspectives in Penicillin binding proteins and Immunoprecipitation.

Between 2017 and 2021, his most popular works were:

  • Class A PBPs have a distinct and unique role in the construction of the pneumococcal cell wall. (20 citations)
  • Structure of the Large Extracellular Loop of FtsX and Its Interaction with the Essential Peptidoglycan Hydrolase PcsB in Streptococcus pneumoniae. (20 citations)
  • Structure of the essential peptidoglycan amidotransferase MurT/GatD complex from Streptococcus pneumoniae. (17 citations)

In his most recent research, the most cited papers focused on:

  • Gene
  • DNA
  • Enzyme

Leiv Sigve Håvarstein spends much of his time researching Cell division, Peptidoglycan, Cell biology, CRISPR interference and Gene. His Peptidoglycan study is related to the wider topic of Biochemistry. His work on Operon, DNA ligase and Active site as part of general Biochemistry study is frequently connected to Glutamine amidotransferase, therefore bridging the gap between diverse disciplines of science and establishing a new relationship between them.

His biological study spans a wide range of topics, including Bacterial cell structure and Cell Cycle Protein. Leiv Sigve Håvarstein has researched CRISPR interference in several fields, including Mutation, Cell, Gene knockdown and Cell Cycle Gene. His Gene study is concerned with the larger field of Genetics.

Best Publications

  • Biosynthesis of bacteriocins in lactic acid bacteria

    Ingolf F. Nes;Dzung Bao Diep;Leiv Sigve Håvarstein;May Bente Brurberg

  • An unmodified heptadecapeptide pheromone induces competence for genetic transformation in Streptococcus pneumoniae

    Leiv Sigve Havarstein;Gowri Coomaraswamy;Donald A. Morrison

  • A family of bacteriocin ABC transporters carry out proteolytic processing of their substrates concomitant with export

    Leiv Sigve Havarstein;Dzung Bao Diep;Ingolf F. Nes

  • Biochemical and genetic characterization of enterocin P, a novel sec-dependent bacteriocin from Enterococcus faecium P13 with a broad antimicrobial spectrum.

    L M Cintas;P Casaus;L S Håvarstein;P E Hernández

  • Biochemical and genetic characterization of enterocin A from Enterococcus faecium, a new antilisterial bacteriocin in the pediocin family of bacteriocins.

    T Aymerich;H Holo;L S Håvarstein;M Hugas

  • Production of class II bacteriocins by lactic acid bacteria; an example of biological warfare and communication

    Vincent G H Eijsink;Lars Axelsson;Dzung B Diep;Leiv S Håvarstein

  • Regulation of competence for genetic transformation in Streptococcus pneumoniae by an auto-induced peptide pheromone and a two-component regulatory system.

    E. V. Pestova;L. S. Håvarstein;D. A. Morrison

  • A novel lactococcal bacteriocin whose activity depends on the complementary action of two peptides.

    J Nissen-Meyer;H Holo;L S Håvarstein;K Sletten

  • Characterization of the locus responsible for the bacteriocin production in Lactobacillus plantarum C11.

    D B Diep;L S Håvarstein;I F Nes

  • Natural genetic transformation: prevalence, mechanisms and function.

    Ola Johnsborg;Vegard Eldholm;Leiv Sigve Håvarstein

  • Enterocins L50A and L50B, Two Novel Bacteriocins from Enterococcus faecium L50, Are Related to Staphylococcal Hemolysins

    Luis M. Cintas;Pilar Casaus;Helge Holo;Pablo E. Hernandez

  • Biochemical and Genetic Evidence that Enterococcus faecium L50 Produces Enterocins L50A and L50B, the sec-Dependent Enterocin P, and a Novel Bacteriocin Secreted without an N-Terminal Extension Termed Enterocin Q

    Luis M. Cintas;Pilar Casaus;Carmen Herranz;Leiv Sigve Håvarstein

  • IDENTIFICATION OF THE STREPTOCOCCAL COMPETENCE-PHEROMONE RECEPTOR

    Leiv Sigve Håvarstein;Peter Gaustad;Ingolf F. Nes;Donald A. Morrison

  • Induction of natural competence in Streptococcus pneumoniae triggers lysis and DNA release from a subfraction of the cell population.

    Hilde Steinmoen;Eivind Knutsen;Leiv Sigve Håvarstein

  • Natural competence in the genus Streptococcus: evidence that streptococci can change pherotype by interspecies recombinational exchanges.

    Leiv Sigve Håvarstein;Regine Hakenbeck;Peter Gaustad

  • Evolution of Streptococcus pneumoniae and its close commensal relatives.

    Mogens Kilian;Knud Poulsen;Trinelise Blomqvist;Leiv S. Håvarstein

  • Cannibalism and fratricide: mechanisms and raisons d'être.

    Jean-Pierre Claverys;Leiv S. Håvarstein

  • Competence for genetic transformation in encapsulated strains of Streptococcus pneumoniae: two allelic variants of the peptide pheromone.

    Gianni Pozzi;L. Masala;Francesco Iannelli;R. Manganelli

  • The leader peptide of colicin V shares consensus sequences with leader peptides that are common among peptide bacteriocins produced by gram-positive bacteria.

    Leiv Sigve Håvarstein;Helge Holo;Ingolf F. Nes

  • Identification of DNA binding sites for ComE, a key regulator of natural competence in Streptococcus pneumoniae

    Ola Ween;Peter Gaustad;Leiv Sigve Håvarstein

Frequent Co-Authors

Ingolf F. Nes
Ingolf F. Nes Norwegian University of Life Sciences
Juan A. Hermoso
Juan A. Hermoso Spanish National Research Council
Dzung B. Diep
Dzung B. Diep Norwegian University of Life Sciences
Jean-Pierre Claverys
Jean-Pierre Claverys Paul Sabatier University
Waldemar Vollmer
Waldemar Vollmer Newcastle University
Jon Nissen-Meyer
Jon Nissen-Meyer University of Oslo
Mogens Kilian
Mogens Kilian Aarhus University
Pablo E. Hernández
Pablo E. Hernández Complutense University of Madrid
Donald A. Morrison
Donald A. Morrison University of Illinois at Chicago
Hervé Tettelin
Hervé Tettelin University of Maryland, Baltimore

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