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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Microbiology 63 2769 2537 246 231 172 12739

Ian N. Clarke publications per year

The chart shows the history of publications by Ian N. Clarke between 1970 and 2024, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ian N. Clarke published across 55 years, from 1970 to 2024, averaging 3.4 papers a year. Output peaked at 12 publications in 1991. 4 of the 185 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1970 to 2024. Vertical axis: number of publications, 0 to 12. Peak 12 publications in 1991. 1970: 1 publication 1971: 0 publications 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 0 publications 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 0 publications 1980: 0 publications 1981: 2 publications 1982: 3 publications 1983: 1 publication 1984: 0 publications 1985: 1 publication 1986: 0 publications 1987: 2 publications 1988: 7 publications 1989: 8 publications 1990: 9 publications 1991: 12 publications 1992: 4 publications 1993: 1 publication 1994: 5 publications 1995: 10 publications 1996: 2 publications 1997: 9 publications 1998: 2 publications 1999: 4 publications 2000: 7 publications 2001: 2 publications 2002: 4 publications 2003: 4 publications 2004: 4 publications 2005: 2 publications 2006: 5 publications 2007: 5 publications 2008: 5 publications 2009: 4 publications 2010: 7 publications 2011: 11 publications 2012: 3 publications 2013: 7 publications 2014: 5 publications 2015: 1 publication 2016: 4 publications 2017: 3 publications 2018: 6 publications 2019: 3 publications 2020: 3 publications 2021: 3 publications 2022: 0 publications 2023: 0 publications 2024: 4 publications
1970 2024

185 publications in total across all disciplines

View publications per year as a table
Ian N. Clarke: publications per year, 1970 to 2024
Year Publications
1970 1
1971 0
1972 0
1973 0
1974 0
1975 0
1976 0
1977 0
1978 0
1979 0
1980 0
1981 2
1982 3
1983 1
1984 0
1985 1
1986 0
1987 2
1988 7
1989 8
1990 9
1991 12
1992 4
1993 1
1994 5
1995 10
1996 2
1997 9
1998 2
1999 4
2000 7
2001 2
2002 4
2003 4
2004 4
2005 2
2006 5
2007 5
2008 5
2009 4
2010 7
2011 11
2012 3
2013 7
2014 5
2015 1
2016 4
2017 3
2018 6
2019 3
2020 3
2021 3
2022 0
2023 0
2024 4
Total 185
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Ian N. Clarke 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 Ian N. Clarke 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, 165–174 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: 172 publications — 37th percentile

37% 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
145–154 265
155–164 264
165–174 253 172
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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Ian N. Clarke 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 Ian N. Clarke 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, 63 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: 63 D-Index — 52nd percentile

52% 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
63 144 63
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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Overview

Ian N. Clarke is affiliated with the University of Southampton in the United Kingdom. Their research primarily focuses on topics within Medicine, Immunology and Microbiology, and Health Professions, with notable contributions in the subfields of Microbiology, General Health Professions, Ecology, Physiology, and Epidemiology.

The scientist has published extensively on topics related to reproductive tract infections research, bacteriophages and microbial interactions, syphilis diagnosis and treatment, urinary tract infections management, mental health and patient involvement, transgenic plants and applications, and the epidemiology of HIV, TB, and STIs.

Recent papers authored by Ian N. Clarke include the following:

  • An inducible transposon mutagenesis approach for the intracellular human pathogen Chlamydia trachomatis (2021, Wellcome Open Research)
  • The Nature and Extent of Plasmid Variation in Chlamydia trachomatis (2020, Microorganisms)
  • Diversity in Chlamydial plasmids (2020, PLoS ONE)
  • High-resolution genotyping of Lymphogranuloma Venereum (LGV) strains of Chlamydia trachomatis in London using multi-locus VNTR analysis-ompA genotyping (MLVA-ompA) (2021, PLoS ONE)
  • Progress towards an inducible, replication-proficient transposon delivery vector for Chlamydia trachomatis (2021, Wellcome Open Research)

Their frequent coauthors include:

  • Colette O'Neill
  • Nicholas R. Thomson
  • Rachel J. Skilton
  • David Cleary
  • David J. Lampe

Ian N. Clarke's work appears regularly in several publication venues, including:

  • Wellcome Open Research
  • PLoS ONE
  • Microorganisms
  • Viruses
  • Pathogens and Disease

The scope of Ian N. Clarke's research covers infectious disease mechanisms, microbial genetics, and the epidemiology of bacterial pathogens, with a particular emphasis on Chlamydia trachomatis. The integration of molecular approaches, such as transposon mutagenesis and plasmid variability studies, is a core aspect of their scientific contributions.

Best Publications

  • Norwalk-like viruses

    Ian N. Clarke;Paul R. Lambden

  • Taxonomy of the caliciviruses.

    K Y Green;T Ando;M S Balayan;T Berke

  • Development of a transformation system for Chlamydia trachomatis: restoration of glycogen biosynthesis by acquisition of a plasmid shuttle vector.

    Yibing Wang;Simona Kahane;Lesley T. Cutcliffe;Rachel J. Skilton

  • Sequence and genome organization of a human small round-structured (Norwalk-like) virus.

    PR Lambden;EO Caul;CR Ashley;IN Clarke

  • Whole-genome analysis of diverse Chlamydia trachomatis strains identifies phylogenetic relationships masked by current clinical typing

    Simon R Harris;Ian N Clarke;Helena M B Seth-Smith;Anthony W Solomon

  • Chlamydia trachomatis: Genome sequence analysis of lymphogranuloma venereum isolates

    Nicholas R. Thomson;Matthew T.G. Holden;Caroline Carder;Nicola Lennard

  • Genotypic and Physiological Characterization of Saccharomyces boulardii, the Probiotic Strain of Saccharomyces cerevisiae

    Laura Edwards-Ingram;Paul Gitsham;Nicola Burton;Geoff Warhurst

  • Cloning of noncultivatable human rotavirus by single primer amplification.

    P R Lambden;S J Cooke;E O Caul;I N Clarke

  • Point mutation in meningococcal por A gene associated with increased endemic disease.

    B.T. McGuinness;I.N. Clarke;P.R. Lambden;A.K. Barlow

  • Molecular Characterization of a Bovine Enteric Calicivirus: Relationship to the Norwalk-Like Viruses

    B. L. Liu;P. R. Lambden;H. Günther;P. Otto

  • Organization and Expression of Calicivirus Genes

    Ian N. Clarke;Paul R. Lambden

  • The molecular biology of caliciviruses.

    Ian N. Clarke;Paul R. Lambden

  • Human enteric Caliciviridae: the complete genome sequence and expression of virus-like particles from a genetic group II small round structured virus

    Dingle Ke;Lambden Pr;Caul Eo;Clarke In

  • Management of hospital outbreaks of gastro-enteritis due to small roundstructured viruses.

    P. R. Chadwick;G. Beards;D. Brown;E. O. Caul

  • Deduced amino acid sequences of class 1 protein (PorA) from three strains of Neisseria meningitidis. Synthetic peptides define the epitopes responsible for serosubtype specificity.

    Brian McGuinness;Ann K. Barlow;Ian N. Clarke;John E. Farley

  • Human enteric caliciviruses have a unique genome structure and are distinct from the Norwalk-like viruses

    B. L. Liu;I. N. Clarke;E. O. Caul;P. R. Lambden

  • Cloning and nucleotide sequencing of the Clostridium perfringens epsilon-toxin gene and its expression in Escherichia coli.

    S. E. C. Hunter;I. N. Clarke;D. C. Kelly;R. W. Titball

  • The plasmids of Chlamydia trachomatis and Chlamydophila pneumoniae (N16): accurate determination of copy number and the paradoxical effect of plasmid-curing agents

    Mark A. Pickett;J. Sylvia Everson;Patrick J. Pead;Ian N. Clarke

  • Polyprotein processing in Southampton virus: identification of 3C-like protease cleavage sites by in vitro mutagenesis.

    Binlei Liu;I. N. Clarke;P. R. Lambden

  • Plasmid diversity in Chlamydia

    NS Thomas;ME Lusher;CC Storey;IN Clarke

Frequent Co-Authors

Paul R. Lambden
Paul R. Lambden Southampton General Hospital
Nicholas R. Thomson
Nicholas R. Thomson Wellcome Sanger Institute
John E. Heckels
John E. Heckels University of Southampton
Simon R. Harris
Simon R. Harris Wellcome Sanger Institute
Martin J. Holland
Martin J. Holland London School of Hygiene & Tropical Medicine
Magnus Unemo
Magnus Unemo Örebro University
David Mabey
David Mabey London School of Hygiene & Tropical Medicine
Julian Parkhill
Julian Parkhill University of Cambridge
Robin L. Bailey
Robin L. Bailey London School of Hygiene & Tropical Medicine
Taane G. Clark
Taane G. Clark London School of Hygiene & Tropical Medicine

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