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D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Biology and Biochemistry 55 15260 78 137 8600

Svein Valla publications per year

The chart shows the history of publications by Svein Valla between 1981 and 2020, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Svein Valla published across 40 years, from 1981 to 2020, averaging 3.5 papers a year. Output peaked at 15 publications in 2013. 2 of the 141 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1981 to 2020. Vertical axis: number of publications, 0 to 15. Peak 15 publications in 2013. 1981: 1 publication 1982: 1 publication 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 1 publication 1987: 1 publication 1988: 0 publications 1989: 2 publications 1990: 0 publications 1991: 3 publications 1992: 2 publications 1993: 1 publication 1994: 4 publications 1995: 3 publications 1996: 1 publication 1997: 6 publications 1998: 6 publications 1999: 7 publications 2000: 8 publications 2001: 4 publications 2002: 2 publications 2003: 3 publications 2004: 8 publications 2005: 2 publications 2006: 5 publications 2007: 4 publications 2008: 6 publications 2009: 8 publications 2010: 8 publications 2011: 6 publications 2012: 5 publications 2013: 15 publications 2014: 6 publications 2015: 3 publications 2016: 3 publications 2017: 3 publications 2018: 1 publication 2019: 1 publication 2020: 1 publication
1981 2020

141 publications in total across all disciplines

View publications per year as a table
Svein Valla: publications per year, 1981 to 2020
Year Publications
1981 1
1982 1
1983 0
1984 0
1985 0
1986 1
1987 1
1988 0
1989 2
1990 0
1991 3
1992 2
1993 1
1994 4
1995 3
1996 1
1997 6
1998 6
1999 7
2000 8
2001 4
2002 2
2003 3
2004 8
2005 2
2006 5
2007 4
2008 6
2009 8
2010 8
2011 6
2012 5
2013 15
2014 6
2015 3
2016 3
2017 3
2018 1
2019 1
2020 1
Total 141
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Svein Valla 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 Svein Valla sits on this spectrum.

No. of scientists
200 400 600 800
Bar chart with 100 bars. Horizontal axis: publications, 47–56 to 1,028+. Vertical axis: number of scientists, 0 to 980. Most scientists, 980, have 127–136 publications. The last bar groups every scientist with 1,028 publications or more. The highlighted bar, 137–146 publications, is where this scientist sits. 47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 413 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 848 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 949 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 840 scientists 207–216 publications: 733 scientists 217–226 publications: 708 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: 417 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: 196 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: 59 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 scientist 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientist 1,028+ publications: 100 scientists
47–56 publications 1,028+

This scientist: 137 publications — 20th percentile

20% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Biology and Biochemistry scientists by publication count, Research.com 2026 ranking edition. Based on 19,587 ranked scientists.
Publications Scientists This scientist
47–56 8
57–66 35
67–76 106
77–86 231
87–96 413
97–106 546
107–116 704
117–126 848
127–136 980
137–146 942 137
147–156 969
157–166 949
167–176 951
177–186 915
187–196 787
197–206 840
207–216 733
217–226 708
227–236 651
237–246 605
247–256 510
257–266 524
267–276 434
277–286 417
287–296 350
297–306 363
307–316 315
317–326 296
327–336 261
337–346 240
347–356 219
357–366 196
367–376 154
377–386 161
387–396 155
397–406 145
407–416 124
417–426 112
427–436 132
437–446 116
447–456 99
457–466 81
467–476 91
477–486 80
487–496 80
497–506 59
507–516 36
517–526 46
527–536 54
537–546 44
547–556 43
557–566 43
567–576 42
577–586 25
587–596 34
597–606 23
607–616 33
617–626 31
627–636 27
637–646 25
647–656 28
657–666 34
667–676 18
677–686 16
687–696 10
697–706 12
707–716 21
717–726 12
727–736 12
737–746 10
747–756 7
757–766 13
767–776 15
777–786 13
787–796 9
797–806 9
807–816 7
817–826 4
827–836 9
837–846 7
847–856 3
857–866 5
867–876 5
877–886 11
887–896 3
897–906 4
907–916 7
917–926 5
927–936 6
937–946 6
947–956 3
957–966 7
967–976 2
977–986 2
987–996 1
997–1,006 5
1,007–1,016 2
1,017–1,026 2
1,027 1
1,028+ 100
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Svein Valla 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 Svein Valla sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 65 bars. Horizontal axis: D-Index, 40–41 to 167+. Vertical axis: number of scientists, 0 to 1,253. Most scientists, 1,253, have 58–59 D-Index. The last bar groups every scientist with 167 D-Index or more. The highlighted bar, 54–55 D-Index, is where this scientist sits. 40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 316 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 899 scientists 52–53 D-Index: 1,025 scientists 54–55 D-Index: 1,149 scientists 56–57 D-Index: 1,235 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,162 scientists 62–63 D-Index: 1,130 scientists 64–65 D-Index: 1,031 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 714 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: 71 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
40–41 D-Index 167+

This scientist: 55 D-Index — 25th percentile

25% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Biology and Biochemistry scientists by D-index, Research.com 2026 ranking edition. Based on 19,587 ranked scientists.
D-Index Scientists This scientist
40–41 80
42–43 183
44–45 316
46–47 504
48–49 718
50–51 899
52–53 1,025
54–55 1,149 55
56–57 1,235
58–59 1,253
60–61 1,162
62–63 1,130
64–65 1,031
66–67 897
68–69 814
70–71 714
72–73 709
74–75 596
76–77 512
78–79 473
80–81 412
82–83 373
84–85 358
86–87 285
88–89 273
90–91 227
92–93 208
94–95 193
96–97 153
98–99 157
100–101 148
102–103 120
104–105 113
106–107 100
108–109 86
110–111 67
112–113 71
114–115 73
116–117 64
118–119 53
120–121 60
122–123 54
124–125 43
126–127 38
128–129 49
130–131 26
132–133 18
134–135 23
136–137 32
138–139 32
140–141 27
142–143 19
144–145 22
146–147 12
148–149 16
150–151 14
152–153 10
154–155 13
156–157 10
158–159 7
160–161 9
162–163 13
164–165 4
166 4
167+ 98
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Overview

Svein Valla was affiliated with the Norwegian University of Science and Technology in Norway. Their research contributions spanned the fields of biochemistry, genetics, molecular biology, and energy, with particular focus on biotechnology, molecular biology, and renewable energy, sustainability, and the environment.

Their work addressed key topics including enzyme production and characterization, enzyme catalysis and immobilization, and algal biology and biofuel production.

Among the documented publications, one notable paper was titled Identification of Regulatory Genes and Metabolic Processes Important for Alginate Biosynthesis in Azotobacter vinelandii by Screening of a Transposon Insertion Mutant Library, published in 2020 in the journal Frontiers in Bioengineering and Biotechnology.

Svein Valla collaborated with several frequent co-authors, including:

  • Mali Mærk
  • Øyvind Jakobsen
  • Håvard Sletta
  • Geir Klinkenberg
  • Anne Tøndervik

In terms of publication venues, their work appeared in:

  • Frontiers in Bioengineering and Biotechnology

Best Publications

  • Bacterial alginates: Biosynthesis and applications

    B. H. A. Rehm;S. Valla

  • Genome Sequence of Azotobacter vinelandii, an Obligate Aerobe Specialized To Support Diverse Anaerobic Metabolic Processes

    João C. Setubal;Patricia dos Santos;Barry S. Goldman;Helga Ertesvåg

  • Biosynthesis of the polyene antifungal antibiotic nystatin in Streptomyces noursei ATCC 11455: analysis of the gene cluster and deduction of the biosynthetic pathway

    Trygve Brautaset;Olga N Sekurova;Håvard Sletta;Trond E Ellingsen

  • Construction and use of a versatile set of broad-host-range cloning and expression vectors based on the RK2 replicon.

    J M Blatny;T Brautaset;H C Winther-Larsen;K Haugan

  • Biosynthesis and applications of alginates

    Helga Ertesvåg;Svein Valla

  • A new gene required for cellulose production and a gene encoding cellulolytic activity in Acetobacter xylinum are colocalized with the bcs operon.

    R. Standal;Tore Geir Iversen;D. H. Coucheron;E. Fjaervik

  • IMPROVED BROAD-HOST-RANGE RK2 VECTORS USEFUL FOR HIGH AND LOW REGULATED GENE EXPRESSION LEVELS IN GRAM-NEGATIVE BACTERIA

    Janet Martha Blatny;Trygve Brautaset;Hanne C. Winther-Larsen;Ponniah Karunakaran

  • A FAMILY OF MODULAR TYPE MANNURONAN C-5-EPIMERASE GENES CONTROLS ALGINATE STRUCTURE IN AZOTOBACTER VINELANDII

    Helga Ertesvåg;Hilde Kristin Høidal;Ingrid Kathrin Hals;Anne Rian

  • The Pseudomonas fluorescens AlgG Protein, but Not Its Mannuronan C-5-Epimerase Activity, Is Needed for Alginate Polymer Formation

    Martin Gimmestad;Håvard Sletta;Helga Ertesvåg;Karianne Bakkevig

  • Cloning and expression of an Azotobacter vinelandii mannuronan C-5-epimerase gene.

    H Ertesvåg;B Doseth;B Larsen;G Skjåk-Braek

  • In Vivo Analysis of the Regulatory Genes in the Nystatin Biosynthetic Gene Cluster of Streptomyces noursei ATCC 11455 Reveals Their Differential Control Over Antibiotic Biosynthesis

    Olga N. Sekurova;Trygve Brautaset;Håvard Sletta;Sven E. F. Borgos

  • The Presence of N-Terminal Secretion Signal Sequences Leads to Strong Stimulation of the Total Expression Levels of Three Tested Medically Important Proteins during High-Cell-Density Cultivations of Escherichia coli

    H. Sletta;A. Tøndervik;S. Hakvåg;T. E. Vee Aune

  • Rk2-based broad-host-range cloning vector useful for transfer of metagenomic libraries to a variety of bacterial species

    Trine Aakvik;Kristin Floegstad Degnes;Trond Erling Ellingsen;Rannveig Skrede

  • Cloning and expression of three new Aazotobacter vinelandii genes closely related to a previously described gene family encoding mannuronan C-5-epimerases.

    Britt Iren Glærum Svanem;Gudmund Skjåk-Bræk;Helga Ertesvåg;Svein Valla

  • A comparative analysis of the properties of regulated promoter systems commonly used for recombinant gene expression in Escherichia coli

    Simone Balzer;Veronika Kucharova;Judith A. Megerle;Rahmi Lale

  • Upregulated transcription of plasmid and chromosomal ribulose monophosphate pathway genes is critical for methanol assimilation rate and methanol tolerance in the methylotrophic bacterium Bacillus methanolicus.

    Øyvind M. Jakobsen;Øyvind M. Jakobsen;Aline Benichou;Michael C. Flickinger;Svein Valla

  • New broad-host-range promoter probe vectors based on the plasmid RK2 replicon

    Pedro Miguel Santos;Ilaria Di Bartolo;Janet Martha Blatny;Elisabetta Zennaro

  • Ionic and acid gel formation of epimerised alginates; the effect of AlgE4.

    Kurt I. Draget;Berit Strand;Martin Hartmann;Svein Valla

  • Cellulose-negative Mutants of Acetobacter xylinum

    Svein Valla;Johs. Kjosbakken

  • Metagenomics of microbial life in extreme temperature environments.

    Anna Lewin;Alexander Wentzel;Svein Valla

Frequent Co-Authors

Gudmund Skjåk-Bræk
Gudmund Skjåk-Bræk Norwegian University of Science and Technology
Dennis E. Ohman
Dennis E. Ohman Virginia Commonwealth University Medical Center
Bernd H. A. Rehm
Bernd H. A. Rehm Griffith University
Royston Goodacre
Royston Goodacre University of Liverpool
Mark R. Liles
Mark R. Liles Auburn University
Don A. Cowan
Don A. Cowan University of Pretoria
Angela Sessitsch
Angela Sessitsch Austrian Institute of Technology
João C. Setubal
João C. Setubal Universidade de São Paulo
David J. Studholme
David J. Studholme University of Exeter
Kjetill S. Jakobsen
Kjetill S. Jakobsen University of Oslo

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