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Microbiology
Norway
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Microbiology 62 2858 2620 11 10 142 14918

Per Einar Granum publications per year

The chart shows the history of publications by Per Einar Granum between 1978 and 2022, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Per Einar Granum published across 45 years, from 1978 to 2022, averaging 3.6 papers a year. Output peaked at 10 publications in 2011. 3 of the 160 publications appeared in the last two years.

No. of publications
2 4 6 8 10
Bar chart. Horizontal axis: year, 1978 to 2022. Vertical axis: number of publications, 0 to 10. Peak 10 publications in 2011. 1978: 2 publications 1979: 4 publications 1980: 6 publications 1981: 2 publications 1982: 1 publication 1983: 1 publication 1984: 2 publications 1985: 2 publications 1986: 0 publications 1987: 2 publications 1988: 2 publications 1989: 0 publications 1990: 2 publications 1991: 3 publications 1992: 0 publications 1993: 3 publications 1994: 3 publications 1995: 4 publications 1996: 4 publications 1997: 6 publications 1998: 4 publications 1999: 5 publications 2000: 3 publications 2001: 7 publications 2002: 4 publications 2003: 2 publications 2004: 4 publications 2005: 6 publications 2006: 7 publications 2007: 5 publications 2008: 5 publications 2009: 6 publications 2010: 3 publications 2011: 10 publications 2012: 9 publications 2013: 10 publications 2014: 5 publications 2015: 4 publications 2016: 1 publication 2017: 3 publications 2018: 1 publication 2019: 3 publications 2020: 1 publication 2021: 2 publications 2022: 1 publication
1978 2022

160 publications in total across all disciplines

View publications per year as a table
Per Einar Granum: publications per year, 1978 to 2022
Year Publications
1978 2
1979 4
1980 6
1981 2
1982 1
1983 1
1984 2
1985 2
1986 0
1987 2
1988 2
1989 0
1990 2
1991 3
1992 0
1993 3
1994 3
1995 4
1996 4
1997 6
1998 4
1999 5
2000 3
2001 7
2002 4
2003 2
2004 4
2005 6
2006 7
2007 5
2008 5
2009 6
2010 3
2011 10
2012 9
2013 10
2014 5
2015 4
2016 1
2017 3
2018 1
2019 3
2020 1
2021 2
2022 1
Total 160
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Per Einar Granum publication distribution in Microbiology in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Microbiology in 2026. The highlighted bar marks where Per Einar Granum sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 64 bars. Horizontal axis: publications, 55–64 to 679+. Vertical axis: number of scientists, 0 to 288. Most scientists, 288, have 135–144 publications. The last bar groups every scientist with 679 publications or more. The highlighted bar, 135–144 publications, is where this scientist sits. 55–64 publications: 8 scientists 65–74 publications: 29 scientists 75–84 publications: 55 scientists 85–94 publications: 112 scientists 95–104 publications: 137 scientists 105–114 publications: 190 scientists 115–124 publications: 235 scientists 125–134 publications: 234 scientists 135–144 publications: 288 scientists 145–154 publications: 265 scientists 155–164 publications: 264 scientists 165–174 publications: 253 scientists 175–184 publications: 276 scientists 185–194 publications: 190 scientists 195–204 publications: 234 scientists 205–214 publications: 208 scientists 215–224 publications: 198 scientists 225–234 publications: 155 scientists 235–244 publications: 161 scientists 245–254 publications: 160 scientists 255–264 publications: 146 scientists 265–274 publications: 139 scientists 275–284 publications: 148 scientists 285–294 publications: 115 scientists 295–304 publications: 96 scientists 305–314 publications: 88 scientists 315–324 publications: 106 scientists 325–334 publications: 65 scientists 335–344 publications: 76 scientists 345–354 publications: 64 scientists 355–364 publications: 62 scientists 365–374 publications: 65 scientists 375–384 publications: 61 scientists 385–394 publications: 34 scientists 395–404 publications: 44 scientists 405–414 publications: 36 scientists 415–424 publications: 35 scientists 425–434 publications: 29 scientists 435–444 publications: 33 scientists 445–454 publications: 34 scientists 455–464 publications: 25 scientists 465–474 publications: 26 scientists 475–484 publications: 20 scientists 485–494 publications: 19 scientists 495–504 publications: 16 scientists 505–514 publications: 17 scientists 515–524 publications: 23 scientists 525–534 publications: 14 scientists 535–544 publications: 14 scientists 545–554 publications: 18 scientists 555–564 publications: 12 scientists 565–574 publications: 7 scientists 575–584 publications: 9 scientists 585–594 publications: 9 scientists 595–604 publications: 9 scientists 605–614 publications: 7 scientists 615–624 publications: 9 scientists 625–634 publications: 7 scientists 635–644 publications: 4 scientists 645–654 publications: 5 scientists 655–664 publications: 6 scientists 665–674 publications: 7 scientists 675–678 publications: 3 scientists 679+ publications: 99 scientists
55–64 publications 679+

This scientist: 142 publications — 22nd percentile

22% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 679 publications or more.

View publications distribution as a table
Number of Microbiology scientists by publication count, Research.com 2026 ranking edition. Based on 5,513 ranked scientists.
Publications Scientists This scientist
55–64 8
65–74 29
75–84 55
85–94 112
95–104 137
105–114 190
115–124 235
125–134 234
135–144 288 142
145–154 265
155–164 264
165–174 253
175–184 276
185–194 190
195–204 234
205–214 208
215–224 198
225–234 155
235–244 161
245–254 160
255–264 146
265–274 139
275–284 148
285–294 115
295–304 96
305–314 88
315–324 106
325–334 65
335–344 76
345–354 64
355–364 62
365–374 65
375–384 61
385–394 34
395–404 44
405–414 36
415–424 35
425–434 29
435–444 33
445–454 34
455–464 25
465–474 26
475–484 20
485–494 19
495–504 16
505–514 17
515–524 23
525–534 14
535–544 14
545–554 18
555–564 12
565–574 7
575–584 9
585–594 9
595–604 9
605–614 7
615–624 9
625–634 7
635–644 4
645–654 5
655–664 6
665–674 7
675–678 3
679+ 99
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Per Einar Granum D-index placement in Microbiology in 2026

The chart shows the D-index (discipline H-index) distribution of Microbiology scientists ranked by Research.com in 2026. The highlighted bar marks where Per Einar Granum sits on this spectrum.

No. of scientists
50 100 150
Bar chart with 88 bars. Horizontal axis: D-Index, 40 to 127+. Vertical axis: number of scientists, 0 to 162. Most scientists, 162, have 58 D-Index. The last bar groups every scientist with 127 D-Index or more. The highlighted bar, 62 D-Index, is where this scientist sits. 40 D-Index: 30 scientists 41 D-Index: 86 scientists 42 D-Index: 90 scientists 43 D-Index: 117 scientists 44 D-Index: 122 scientists 45 D-Index: 123 scientists 46 D-Index: 108 scientists 47 D-Index: 110 scientists 48 D-Index: 106 scientists 49 D-Index: 109 scientists 50 D-Index: 129 scientists 51 D-Index: 111 scientists 52 D-Index: 116 scientists 53 D-Index: 127 scientists 54 D-Index: 134 scientists 55 D-Index: 134 scientists 56 D-Index: 112 scientists 57 D-Index: 136 scientists 58 D-Index: 162 scientists 59 D-Index: 151 scientists 60 D-Index: 139 scientists 61 D-Index: 123 scientists 62 D-Index: 126 scientists 63 D-Index: 144 scientists 64 D-Index: 109 scientists 65 D-Index: 103 scientists 66 D-Index: 124 scientists 67 D-Index: 112 scientists 68 D-Index: 103 scientists 69 D-Index: 131 scientists 70 D-Index: 94 scientists 71 D-Index: 93 scientists 72 D-Index: 96 scientists 73 D-Index: 92 scientists 74 D-Index: 80 scientists 75 D-Index: 66 scientists 76 D-Index: 87 scientists 77 D-Index: 60 scientists 78 D-Index: 73 scientists 79 D-Index: 59 scientists 80 D-Index: 57 scientists 81 D-Index: 55 scientists 82 D-Index: 47 scientists 83 D-Index: 77 scientists 84 D-Index: 50 scientists 85 D-Index: 45 scientists 86 D-Index: 42 scientists 87 D-Index: 41 scientists 88 D-Index: 32 scientists 89 D-Index: 38 scientists 90 D-Index: 35 scientists 91 D-Index: 34 scientists 92 D-Index: 27 scientists 93 D-Index: 26 scientists 94 D-Index: 33 scientists 95 D-Index: 22 scientists 96 D-Index: 37 scientists 97 D-Index: 22 scientists 98 D-Index: 21 scientists 99 D-Index: 22 scientists 100 D-Index: 30 scientists 101 D-Index: 16 scientists 102 D-Index: 20 scientists 103 D-Index: 17 scientists 104 D-Index: 19 scientists 105 D-Index: 16 scientists 106 D-Index: 19 scientists 107 D-Index: 18 scientists 108 D-Index: 14 scientists 109 D-Index: 10 scientists 110 D-Index: 9 scientists 111 D-Index: 7 scientists 112 D-Index: 11 scientists 113 D-Index: 6 scientists 114 D-Index: 15 scientists 115 D-Index: 10 scientists 116 D-Index: 12 scientists 117 D-Index: 7 scientists 118 D-Index: 10 scientists 119 D-Index: 10 scientists 120 D-Index: 11 scientists 121 D-Index: 2 scientists 122 D-Index: 7 scientists 123 D-Index: 12 scientists 124 D-Index: 5 scientists 125 D-Index: 9 scientists 126 D-Index: 6 scientists 127+ D-Index: 95 scientists
40 D-Index 127+

This scientist: 62 D-Index — 49th percentile

49% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 127 D-Index or more.

View D-Index distribution as a table
Number of Microbiology scientists by D-index, Research.com 2026 ranking edition. Based on 5,513 ranked scientists.
D-Index Scientists This scientist
40 30
41 86
42 90
43 117
44 122
45 123
46 108
47 110
48 106
49 109
50 129
51 111
52 116
53 127
54 134
55 134
56 112
57 136
58 162
59 151
60 139
61 123
62 126 62
63 144
64 109
65 103
66 124
67 112
68 103
69 131
70 94
71 93
72 96
73 92
74 80
75 66
76 87
77 60
78 73
79 59
80 57
81 55
82 47
83 77
84 50
85 45
86 42
87 41
88 32
89 38
90 35
91 34
92 27
93 26
94 33
95 22
96 37
97 22
98 21
99 22
100 30
101 16
102 20
103 17
104 19
105 16
106 19
107 18
108 14
109 10
110 9
111 7
112 11
113 6
114 15
115 10
116 12
117 7
118 10
119 10
120 11
121 2
122 7
123 12
124 5
125 9
126 6
127+ 95
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Research.com Recognitions

  • 2026 - Research.com Microbiology in Norway Leader Award
  • 2025 - Research.com Microbiology in Norway Leader Award

Overview

Per Einar Granum is affiliated with the Norwegian University of Life Sciences in Norway. Their research primarily spans the fields of Biochemistry, Genetics and Molecular Biology as well as Environmental Science. Within these main disciplines, their work delves into several subfields including Molecular Biology, Biotechnology, Ecology, Infectious Diseases, and Genetics.

The scientist's research topics focus largely on bacterial studies, with a significant emphasis on Bacillus and Francisella bacteria. Other notable areas of investigation include microbial inactivation methods, bacteriophages and microbial interactions, viral gastroenteritis research and epidemiology, Yersinia bacterium and plague research involving ectoparasites, and food-related identification and quantification techniques.

Per Einar Granum has published multiple scientific articles, several appearing in the journal Toxins. Recent papers include:

  • The Food Poisoning Toxins of Bacillus cereus (2021, Toxins)
  • The Bacillus cereus Food Infection as Multifactorial Process (2020, Toxins)
  • Bacillus cereus Toxins (2021, Toxins)

Among frequent co-authors are Erwin Märtlbauer, Richard Dietrich, Nadja Jeßberger, and Monika Ehling-Schulz.

Their publication record shows a concentration in the journal Toxins, with all listed recent papers published there.

Best Publications

  • From soil to gut: Bacillus cereus and its food poisoning toxins

    Lotte P. Stenfors Arnesen;Annette Fagerlund;Per Einar Granum

  • Bacillus cereus and its food poisoning toxins

    Per Einar Granum;Terje Lund

  • A new cytotoxin from Bacillus cereus that may cause necrotic enteritis.

    Terje Lund;Marie-Laure De Buyser;Per Einar Granum

  • What problems does the food industry have with the spore-forming pathogens Bacillus cereus and Clostridium perfringens?

    Annika Andersson;Ulf Rönner;Per Einar Granum

  • Clostridium perfringens and foodborne infections

    Sigrid Brynestad;Per Einar Granum

  • Characterisation of a non-haemolytic enterotoxin complex from Bacillus cereus isolated after a foodborne outbreak

    Terje Lund;Per Einar Granum

  • Emetic toxin formation of Bacillus cereus is restricted to a single evolutionary lineage of closely related strains

    Monika Ehling-Schulz;Birgitta Svensson;Marie-Helene Guinebretiere;Toril Lindbäck

  • Bacillus cytotoxicus sp. nov. is a novel thermotolerant species of the Bacillus cereus Group occasionally associated with food poisoning

    Marie-Hélène Guinebretière;Marie-Hélène Guinebretière;Sandrine Auger;Sandrine Auger;Nathalie Galleron;Nathalie Galleron;Matthias Contzen

  • Bacillus cereus and its toxins

    P.E. Granum

  • The sequence of the non-haemolytic enterotoxin operon from Bacillus cereus.

    Per Einar Granum;Kristin O'sullivan;Terje Lund

  • The Food Poisoning Toxins of Bacillus cereus

    Richard Dietrich;Nadja Jessberger;Monika Ehling-Schulz;Erwin Märtlbauer

  • Characterization of the Bacillus cereus Nhe enterotoxin.

    Toril Lindbäck;Annette Fagerlund;Marianne Skeie Rødland;Per Einar Granum

  • Genetic and functional analysis of the cytK family of genes in Bacillus cereus.

    Annette Fagerlund;Ola Ween;Terje Lund;Simon P. Hardy

  • Probes and polymerase chain reaction for detection of food-borne bacterial pathogens.

    J.E Olsen;S Aabo;W Hill;S Notermans

  • Prevalence, characterization and growth of Bacillus cereus in commercial cooked chilled foods containing vegetables

    C. Choma;C. Choma;M.H. Guinebretière;F. Carlin;P. Schmitt

  • Comparison of biological effect of the two different enterotoxin complexes isolated from three different strains of Bacillus cereus.

    Terje Lund;Per Einar Granum

  • The enterotoxin gene (cpe) of Clostridium perfringens can be chromosomal or plasmid-borne

    Emmanuel Cornillot;Brigitte Saint-Joanis;Georges Daube;Sei-ichi Katayama

  • Analysis of enterotoxin production by Bacillus cereus from dairy products, food poisoning incidents and non-gastrointestinal infections.

    Per Einar Granum;Sigrid Brynestad;John M. Kramer

  • Determination of the toxic potential of Bacillus cereus isolates by quantitative enterotoxin analyses.

    Maximilian Moravek;Richard Dietrich;Christine Buerk;Véronique Broussolle

  • Toxin-producing ability among Bacillus spp. Outside the Bacillus cereus group

    Cecilie From;Rudiger Pukall;Peter Schumann;Víctor Hormazábal

  • Research letterCharacterisation of a non-haemolytic enterotoxin complex from Bacillus cereus isolated after a foodborne outbreak

    Terje Lund;Per Einar Granum

Frequent Co-Authors

Christophe Nguyen-The
Christophe Nguyen-The University of Avignon
Monika Ehling-Schulz
Monika Ehling-Schulz University of Veterinary Medicine Vienna
Juan M. Tomás
Juan M. Tomás University of Barcelona
Didier Lereclus
Didier Lereclus University of Paris-Saclay
Tjakko Abee
Tjakko Abee Wageningen University & Research
Siegfried Scherer
Siegfried Scherer Technical University of Munich
Jacques Mahillon
Jacques Mahillon Université Catholique de Louvain
Even Heir
Even Heir Norwegian Institute of Public Health
Oscar P. Kuipers
Oscar P. Kuipers University of Groningen

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