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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Genetics 71 2181 2074 988 927 147 20848

Robert D. Nicholls publications per year

The chart shows the history of publications by Robert D. Nicholls between 1985 and 2024, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Robert D. Nicholls published across 40 years, from 1985 to 2024, averaging 3.9 papers a year. Output peaked at 16 publications in 1999. 1 of the 155 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1985 to 2024. Vertical axis: number of publications, 0 to 16. Peak 16 publications in 1999. 1985: 6 publications 1986: 4 publications 1987: 8 publications 1988: 0 publications 1989: 6 publications 1990: 1 publication 1991: 1 publication 1992: 8 publications 1993: 13 publications 1994: 9 publications 1995: 4 publications 1996: 8 publications 1997: 9 publications 1998: 11 publications 1999: 16 publications 2000: 8 publications 2001: 4 publications 2002: 1 publication 2003: 4 publications 2004: 4 publications 2005: 6 publications 2006: 3 publications 2007: 2 publications 2008: 1 publication 2009: 0 publications 2010: 1 publication 2011: 2 publications 2012: 2 publications 2013: 2 publications 2014: 0 publications 2015: 1 publication 2016: 0 publications 2017: 1 publication 2018: 0 publications 2019: 1 publication 2020: 2 publications 2021: 2 publications 2022: 3 publications 2023: 0 publications 2024: 1 publication
1985 2024

155 publications in total across all disciplines

View publications per year as a table
Robert D. Nicholls: publications per year, 1985 to 2024
Year Publications
1985 6
1986 4
1987 8
1988 0
1989 6
1990 1
1991 1
1992 8
1993 13
1994 9
1995 4
1996 8
1997 9
1998 11
1999 16
2000 8
2001 4
2002 1
2003 4
2004 4
2005 6
2006 3
2007 2
2008 1
2009 0
2010 1
2011 2
2012 2
2013 2
2014 0
2015 1
2016 0
2017 1
2018 0
2019 1
2020 2
2021 2
2022 3
2023 0
2024 1
Total 155
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Robert D. Nicholls publication distribution in Genetics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Genetics in 2026. The highlighted bar marks where Robert D. Nicholls sits on this spectrum.

No. of scientists
50 100 150 200
Bar chart with 67 bars. Horizontal axis: publications, 45–54 to 703+. Vertical axis: number of scientists, 0 to 217. Most scientists, 217, have 125–134 publications. The last bar groups every scientist with 703 publications or more. The highlighted bar, 145–154 publications, is where this scientist sits. 45–54 publications: 6 scientists 55–64 publications: 10 scientists 65–74 publications: 35 scientists 75–84 publications: 84 scientists 85–94 publications: 102 scientists 95–104 publications: 151 scientists 105–114 publications: 175 scientists 115–124 publications: 203 scientists 125–134 publications: 217 scientists 135–144 publications: 205 scientists 145–154 publications: 193 scientists 155–164 publications: 188 scientists 165–174 publications: 170 scientists 175–184 publications: 178 scientists 185–194 publications: 164 scientists 195–204 publications: 173 scientists 205–214 publications: 159 scientists 215–224 publications: 134 scientists 225–234 publications: 143 scientists 235–244 publications: 105 scientists 245–254 publications: 114 scientists 255–264 publications: 92 scientists 265–274 publications: 88 scientists 275–284 publications: 87 scientists 285–294 publications: 80 scientists 295–304 publications: 62 scientists 305–314 publications: 75 scientists 315–324 publications: 67 scientists 325–334 publications: 60 scientists 335–344 publications: 52 scientists 345–354 publications: 40 scientists 355–364 publications: 48 scientists 365–374 publications: 47 scientists 375–384 publications: 46 scientists 385–394 publications: 31 scientists 395–404 publications: 27 scientists 405–414 publications: 40 scientists 415–424 publications: 30 scientists 425–434 publications: 43 scientists 435–444 publications: 29 scientists 445–454 publications: 14 scientists 455–464 publications: 28 scientists 465–474 publications: 21 scientists 475–484 publications: 21 scientists 485–494 publications: 22 scientists 495–504 publications: 17 scientists 505–514 publications: 12 scientists 515–524 publications: 11 scientists 525–534 publications: 8 scientists 535–544 publications: 8 scientists 545–554 publications: 14 scientists 555–564 publications: 4 scientists 565–574 publications: 11 scientists 575–584 publications: 5 scientists 585–594 publications: 11 scientists 595–604 publications: 12 scientists 605–614 publications: 7 scientists 615–624 publications: 6 scientists 625–634 publications: 10 scientists 635–644 publications: 9 scientists 645–654 publications: 10 scientists 655–664 publications: 6 scientists 665–674 publications: 6 scientists 675–684 publications: 6 scientists 685–694 publications: 4 scientists 695–702 publications: 6 scientists 703+ publications: 100 scientists
45–54 publications 703+

This scientist: 147 publications — 28th percentile

28% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 703 publications or more.

View publications distribution as a table
Number of Genetics scientists by publication count, Research.com 2026 ranking edition. Based on 4,342 ranked scientists.
Publications Scientists This scientist
45–54 6
55–64 10
65–74 35
75–84 84
85–94 102
95–104 151
105–114 175
115–124 203
125–134 217
135–144 205
145–154 193 147
155–164 188
165–174 170
175–184 178
185–194 164
195–204 173
205–214 159
215–224 134
225–234 143
235–244 105
245–254 114
255–264 92
265–274 88
275–284 87
285–294 80
295–304 62
305–314 75
315–324 67
325–334 60
335–344 52
345–354 40
355–364 48
365–374 47
375–384 46
385–394 31
395–404 27
405–414 40
415–424 30
425–434 43
435–444 29
445–454 14
455–464 28
465–474 21
475–484 21
485–494 22
495–504 17
505–514 12
515–524 11
525–534 8
535–544 8
545–554 14
555–564 4
565–574 11
575–584 5
585–594 11
595–604 12
605–614 7
615–624 6
625–634 10
635–644 9
645–654 10
655–664 6
665–674 6
675–684 6
685–694 4
695–702 6
703+ 100
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Robert D. Nicholls D-index placement in Genetics in 2026

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

No. of scientists
50 100 150
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 160+. Vertical axis: number of scientists, 0 to 191. Most scientists, 191, have 62–63 D-Index. The last bar groups every scientist with 160 D-Index or more. The highlighted bar, 70–71 D-Index, is where this scientist sits. 40–41 D-Index: 24 scientists 42–43 D-Index: 52 scientists 44–45 D-Index: 84 scientists 46–47 D-Index: 112 scientists 48–49 D-Index: 118 scientists 50–51 D-Index: 141 scientists 52–53 D-Index: 143 scientists 54–55 D-Index: 145 scientists 56–57 D-Index: 179 scientists 58–59 D-Index: 162 scientists 60–61 D-Index: 175 scientists 62–63 D-Index: 191 scientists 64–65 D-Index: 172 scientists 66–67 D-Index: 184 scientists 68–69 D-Index: 164 scientists 70–71 D-Index: 158 scientists 72–73 D-Index: 150 scientists 74–75 D-Index: 136 scientists 76–77 D-Index: 127 scientists 78–79 D-Index: 127 scientists 80–81 D-Index: 111 scientists 82–83 D-Index: 110 scientists 84–85 D-Index: 110 scientists 86–87 D-Index: 84 scientists 88–89 D-Index: 102 scientists 90–91 D-Index: 66 scientists 92–93 D-Index: 72 scientists 94–95 D-Index: 70 scientists 96–97 D-Index: 54 scientists 98–99 D-Index: 60 scientists 100–101 D-Index: 49 scientists 102–103 D-Index: 55 scientists 104–105 D-Index: 45 scientists 106–107 D-Index: 42 scientists 108–109 D-Index: 28 scientists 110–111 D-Index: 39 scientists 112–113 D-Index: 25 scientists 114–115 D-Index: 31 scientists 116–117 D-Index: 29 scientists 118–119 D-Index: 34 scientists 120–121 D-Index: 29 scientists 122–123 D-Index: 29 scientists 124–125 D-Index: 18 scientists 126–127 D-Index: 27 scientists 128–129 D-Index: 22 scientists 130–131 D-Index: 16 scientists 132–133 D-Index: 11 scientists 134–135 D-Index: 17 scientists 136–137 D-Index: 12 scientists 138–139 D-Index: 21 scientists 140–141 D-Index: 4 scientists 142–143 D-Index: 9 scientists 144–145 D-Index: 14 scientists 146–147 D-Index: 6 scientists 148–149 D-Index: 10 scientists 150–151 D-Index: 7 scientists 152–153 D-Index: 9 scientists 154–155 D-Index: 8 scientists 156–157 D-Index: 8 scientists 158–159 D-Index: 9 scientists 160+ D-Index: 96 scientists
40–41 D-Index 160+

This scientist: 71 D-Index — 51st percentile

51% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 160 D-Index or more.

View D-Index distribution as a table
Number of Genetics scientists by D-index, Research.com 2026 ranking edition. Based on 4,342 ranked scientists.
D-Index Scientists This scientist
40–41 24
42–43 52
44–45 84
46–47 112
48–49 118
50–51 141
52–53 143
54–55 145
56–57 179
58–59 162
60–61 175
62–63 191
64–65 172
66–67 184
68–69 164
70–71 158 71
72–73 150
74–75 136
76–77 127
78–79 127
80–81 111
82–83 110
84–85 110
86–87 84
88–89 102
90–91 66
92–93 72
94–95 70
96–97 54
98–99 60
100–101 49
102–103 55
104–105 45
106–107 42
108–109 28
110–111 39
112–113 25
114–115 31
116–117 29
118–119 34
120–121 29
122–123 29
124–125 18
126–127 27
128–129 22
130–131 16
132–133 11
134–135 17
136–137 12
138–139 21
140–141 4
142–143 9
144–145 14
146–147 6
148–149 10
150–151 7
152–153 9
154–155 8
156–157 8
158–159 9
160+ 96
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Overview

Robert D. Nicholls is affiliated with the University of Pittsburgh in the United States. Their research primarily focuses on Earth and Planetary Sciences, with a strong emphasis on paleontology and related subfields. Nicholls's work intersects multiple disciplines, including paleontology, genetics, oceanography, atmospheric science, and surgery.

The scientist's research topics cover a range of interdisciplinary themes such as paleontology and stratigraphy of fossils, geology and paleoclimatology research, marine biology and ecology research, genetic syndromes and imprinting, evolution and paleontology studies, pancreatic function and diabetes, and genetics and neurodevelopmental disorders.

Throughout their career, Nicholls has contributed numerous papers to several scientific journals. Notable recent publications include:

  • The role of symbiosis in the first colonization of the seafloor by macrobiota: Insights from the oldest Ediacaran biota (Newfoundland, Canada), 2021, Biosystems
  • A newborn screening pilot study using methylation-sensitive high resolution melting on dried blood spots to detect Prader-Willi and Angelman syndromes, 2020, Scientific Reports
  • Palaeobiology of the reclining rangeomorph Beothukis from the Ediacaran Mistaken Point Formation of southeastern Newfoundland, 2020, Geological Magazine
  • Charniodiscus and Arborea Are Separate Genera Within the Arboreomorpha: Using the Holotype of C. concentricus to Resolve a Taphonomic/Taxonomic Tangle, 2022, Frontiers in Earth Science
  • A re-assessment of the taxonomy, palaeobiology and taphonomy of the rangeomorph organism Hapsidophyllas flexibilis from the Ediacaran of Newfoundland, Canada, 2021, Paläontologische Zeitschrift

Nicholls's frequent co-authors include Rod S. Taylor, Duncan McIlroy, Christopher McKean, and Suzanne C. Dufour. Collaborations with Duncan McIlroy have been notably recurrent.

Their publications often appear in specialized venues such as Geological Magazine, Biosystems, Scientific Reports, Frontiers in Earth Science, and Life, demonstrating a consistent presence across multiple respected journals in the fields of Earth sciences and biology.

Best Publications

  • Genetic imprinting suggested by maternal heterodisomy in non-deletion Prader-Willi syndrome

    Robert D. Nicholls;Joan H. M. Knoll;Merlin G. Butler;Susan Karam

  • A highly polymorphic DNA marker linked to adult polycystic kidney disease on chromosome 16

    S. T. Reeders;M. H. Breuning;K. E. Davies;R. D. Nicholls

  • Genome of the marsupial Monodelphis domestica reveals innovation in non-coding sequences

    Tarjei S. Mikkelsen;Tarjei S. Mikkelsen;Matthew J. Wakefield;Bronwen Aken;Chris T. Amemiya

  • Development of type 2 diabetes following intrauterine growth retardation in rats is associated with progressive epigenetic silencing of Pdx1.

    Jun H. Park;Doris A. Stoffers;Robert D. Nicholls;Rebecca A. Simmons

  • Genome Organization, Function, and Imprinting in Prader-Willi and Angelman Syndromes

    Robert D. Nicholls;Jessica L. Knepper

  • Inherited microdeletions in the Angelman and Prader-Willi syndromes define an imprinting centre on human chromosome 15.

    Karin Buiting;Shinji Saitoh;Shinji Saitoh;Stephanie Gross;Bärbel Dittrich

  • Angelman and Prader-Willi syndromes share a common chromosome 15 deletion but differ in parental origin of the deletion.

    J. H. M. Knoll;J. H. M. Knoll;R. D. Nicholls;R. D. Nicholls;R. E. Magenis;J. M. Graham

  • Imprinting in Prader–Willi and Angelman syndromes

    Robert D Nicholls;Shinji Saitoh;Bernhard Horsthemke

  • Allele-specific replication timing of imprinted gene regions

    D Kitsberg;S Selig;M Brandeis;I Simon

  • A maternally methylated CpG island in KvLQT1 is associated with an antisense paternal transcript and loss of imprinting in Beckwith-Wiedemann syndrome.

    Nancy J. Smilinich;Colleen D. Day;Galina V. Fitzpatrick;Germaine M. Caldwell

  • A gene for the mouse pink-eyed dilution locus and for human type II oculocutaneous albinism

    Eugene M. Rinchik;Scott J. Bultman;Bernhard Horsthemke;Seung Taek Lee

  • Distinct phenotypes distinguish the molecular classes of Angelman syndrome

    A C Lossie;M M Whitney;D Amidon;H J Dong

  • Recombination at the human α-globin gene cluster: Sequence features and topological constraints

    R.D. Nicholls;N. Fischel-Ghodsian;D.R. Higgs

  • Growth hormone research society workshop summary: Consensus guidelines for recombinant human growth hormone therapy in Prader-Willi syndrome

    Cheri L. Deal;Michèle Tony;Charlotte Hoÿbye;David B. Allen

  • Imprinting-Mutation Mechanisms in Prader-Willi Syndrome

    T. Ohta;T. A. Gray;P. K. Rogan;K. Buiting

  • Chromosome breakage in the Prader-Willi and Angelman syndromes involves recombination between large, transcribed repeats at proximal and distal breakpoints.

    James M. Amos-Landgraf;Yonggang Ji;Wayne Gottlieb;Theresa Depinet

  • Structure of Chromosomal Duplicons and their Role in Mediating Human Genomic Disorders

    Yonggang Ji;Evan E. Eichler;Stuart Schwartz;Robert D. Nicholls

  • Imprint switching on human chromosome 15 may involve alternative transcripts of the SNRPN gene

    Bärbel Dittrich;Karin Buiting;Bernd Korn;Sarah Rickard

  • The snoRNA MBII-52 (SNORD 115) is processed into smaller RNAs and regulates alternative splicing

    Shivendra Kishore;Amit Khanna;Zhaiyi Zhang;Jingyi Hui

  • Identification of Four Highly Conserved Genes between Breakpoint Hotspots BP1 and BP2 of the Prader-Willi/Angelman Syndromes Deletion Region That Have Undergone Evolutionary Transposition Mediated by Flanking Duplicons

    J. H. Chai;D. P. Locke;J. M. Greally;J. H.M. Knoll

Frequent Co-Authors

Bernhard Horsthemke
Bernhard Horsthemke University of Duisburg-Essen
Peter K. Rogan
Peter K. Rogan University of Western Ontario
Stuart Schwartz
Stuart Schwartz LabCorp (United States)
Karin Buiting
Karin Buiting University of Duisburg-Essen
David J. Weatherall
David J. Weatherall University of Oxford
Marc Lalande
Marc Lalande University of Connecticut Health Center
Douglas R. Higgs
Douglas R. Higgs University of Oxford
John M. Greally
John M. Greally Albert Einstein College of Medicine
Sue Malcolm
Sue Malcolm University College London
Richard A. Spritz
Richard A. Spritz University of Colorado Denver

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