World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
75
Citations
15461
World Ranking
5439
National Ranking
2580

Samuel Kaplan 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 Samuel Kaplan 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: 278 publications — 74th percentile

74% of scientists in this discipline score the same or lower.

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

Samuel Kaplan 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 Samuel Kaplan 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: 75 D-Index — 74th percentile

74% of scientists in this discipline score the same or lower.

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

Research.com Recognitions

  • 2007 - Fellow of the American Association for the Advancement of Science (AAAS)
  • 1986 - ASM Carski Award, American Society for Microbiology

Overview

What is he best known for?

The fields of study he is best known for:

  • Gene
  • Enzyme
  • DNA

Samuel Kaplan mostly deals with Rhodobacter sphaeroides, Biochemistry, Operon, Mutant and Gene expression. His Rhodobacter sphaeroides study combines topics in areas such as Molecular biology, Gene product and Gene. His Molecular biology research focuses on Regulatory sequence and how it relates to Consensus sequence.

His work in the fields of Cell membrane, Bacteriochlorophyll and Structural gene overlaps with other areas such as Photosynthetic membrane. His Operon study typically links adjacent topics like Mutation. While the research belongs to areas of Gene expression, Samuel Kaplan spends his time largely on the problem of Response regulator, intersecting his research to questions surrounding Histidine kinase and lac operon.

His most cited work include:

  • prrA, a putative response regulator involved in oxygen regulation of photosynthesis gene expression in Rhodobacter sphaeroides. (218 citations)
  • A quorum-sensing system in the free-living photosynthetic bacterium Rhodobacter sphaeroides. (189 citations)
  • Molecular genetics of photosynthetic membrane biosynthesis in Rhodobacter sphaeroides. (177 citations)

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

Samuel Kaplan spends much of his time researching Rhodobacter sphaeroides, Biochemistry, Gene, Operon and Molecular biology. His Rhodobacter sphaeroides research includes themes of Histidine kinase, Mutant and Gene expression. His Mutant study which covers Mutation that intersects with Cytochrome.

His work in Gene addresses subjects such as DNA, which are connected to disciplines such as Binding site. Samuel Kaplan combines subjects such as Gene cluster, Gene product, Repressor and lac operon with his study of Operon. His study in Molecular biology is interdisciplinary in nature, drawing from both Nucleic acid sequence, Plasmid, Transcription, Regulatory sequence and Structural gene.

He most often published in these fields:

  • Rhodobacter sphaeroides (79.65%)
  • Biochemistry (59.29%)
  • Gene (33.63%)

What were the highlights of his more recent work (between 2004-2013)?

  • Rhodobacter sphaeroides (79.65%)
  • Biochemistry (59.29%)
  • Gene (33.63%)

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

His primary scientific interests are in Rhodobacter sphaeroides, Biochemistry, Gene, Proteome and Transcriptome. His Rhodobacter sphaeroides research integrates issues from Periplasmic space and Mutant. His biological study focuses on Heme.

His Gene study integrates concerns from other disciplines, such as DNA and Binding site. His biological study spans a wide range of topics, including Integral membrane protein, Molecular biology, Membrane transport and Plasmid. His work carried out in the field of Transcriptome brings together such families of science as Transcriptional regulation, Microbiology, Bacteria and ORFS, Open reading frame.

Between 2004 and 2013, his most popular works were:

  • Comparative genomics and site-directed mutagenesis support the existence of only one input channel for protons in the C-family (cbb3 oxidase) of heme-copper oxygen reductases. (65 citations)
  • Genome Analyses of Three Strains of Rhodobacter sphaeroides: Evidence of Rapid Evolution of Chromosome II (63 citations)
  • Transcriptome Dynamics during the Transition from Anaerobic Photosynthesis to Aerobic Respiration in Rhodobacter sphaeroides 2.4.1 (53 citations)

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

  • Gene
  • Enzyme
  • DNA

Samuel Kaplan mainly investigates Rhodobacter sphaeroides, Biochemistry, Heme, Gene and Metabolism. His Rhodobacter sphaeroides research is multidisciplinary, incorporating elements of Reductase, Repressor and DNA sequencing. Samuel Kaplan interconnects Amino acid, Paracoccus denitrificans, Aerobic bacteria and Site-directed mutagenesis in the investigation of issues within Reductase.

His research in Repressor intersects with topics in Biophysics and Cofactor. His DNA sequencing study incorporates themes from Chromosome, Genome, Gene rearrangement and Conserved sequence. His Metabolism research incorporates themes from Rhodospirillaceae, Photosynthesis, Transcriptome and Cellular respiration.

Best Publications

  • prrA, a putative response regulator involved in oxygen regulation of photosynthesis gene expression in Rhodobacter sphaeroides.

    Jesus M. Eraso;S. Kaplan

  • Molecular genetics of photosynthetic membrane biosynthesis in Rhodobacter sphaeroides.

    P J Kiley;S Kaplan

  • A quorum-sensing system in the free-living photosynthetic bacterium Rhodobacter sphaeroides.

    Agnes Puskas;E. P. Greenberg;Samuel Kaplan;Amy L. Schaefer

  • Identification of intrinsic high-level resistance to rare-earth oxides and oxyanions in members of the class Proteobacteria: characterization of tellurite, selenite, and rhodium sesquioxide reduction in Rhodobacter sphaeroides.

    M D Moore;S Kaplan

  • Entrapment of a bacterial plasmid in phospholipid vesicles: potential for gene transfer.

    Robert T. Fraley;Chester S. Fornari;Samuel Kaplan

  • Intracytoplasmic membrane synthesis in synchronous cell populations of Rhodopseudomonas sphaeroides. Fate of "old" and "new" membrane.

    D R Lueking;R T Fraley;S Kaplan

  • Redox signaling: globalization of gene expression.

    Jeong‐Il Oh;Samuel Kaplan

  • Aerobic and anaerobic regulation in Rhodobacter sphaeroides 2.4.1: the role of the fnrL gene.

    J H Zeilstra-Ryalls;S Kaplan

  • Oxygen-insensitive synthesis of the photosynthetic membranes of Rhodobacter sphaeroides: a mutant histidine kinase.

    Jesus M. Eraso;S. Kaplan

  • Cloning, DNA sequence, and expression of the Rhodobacter sphaeroides cytochrome c2 gene.

    T J Donohue;A G McEwan;S Kaplan

  • The home stretch, a first analysis of the nearly completed genome of Rhodobacter sphaeroides 2.4.1

    C Mackenzie;M Choudhary;F W Larimer;P F Predki

  • A mammalian mitochondrial drug receptor functions as a bacterial “oxygen” sensor

    Alexei A. Yeliseev;Karl E. Krueger;Samuel Kaplan

  • A sensory transducer homologous to the mammalian peripheral-type benzodiazepine receptor regulates photosynthetic membrane complex formation in Rhodobacter sphaeroides 2.4.1.

    Alexei A. Yeliseev;Samuel Kaplan

  • AppA, a Redox Regulator of Photosystem Formation in Rhodobacter sphaeroides 2.4.1, Is a Flavoprotein IDENTIFICATION OF A NOVEL FAD BINDING DOMAIN

    Mark Gomelsky;Samuel Kaplan

  • Expression of the Rhodobacter sphaeroides hemA and hemT genes, encoding two 5-aminolevulinic acid synthase isozymes.

    E L Neidle;S Kaplan

  • Control of Photosystem Formation in Rhodobacter sphaeroides

    Jill Zeilstra-Ryalls;Mark Gomelsky;Jesus M. Eraso;Alexei Yeliseev

  • cis-acting regulatory elements involved in oxygen and light control of puc operon transcription in Rhodobacter sphaeroides.

    J K Lee;S Kaplan

  • Induction of the photosynthetic membranes of Rhodopseudomonas sphaeroides: biochemical and morphological studies.

    J Chory;T J Donohue;A R Varga;L A Staehelin

  • Phenotypic and genetic characterization of cytochrome c2 deficient mutants of Rhodobacter sphaeroides.

    Timothy J. Donohue;Alastair G. McEwan;Steven Van Doren;Antony R. Crofts

  • Molecular genetic analysis suggesting interactions between AppA and PpsR in regulation of photosynthesis gene expression in Rhodobacter sphaeroides 2.4.1.

    M Gomelsky;S Kaplan

Frequent Co-Authors

Timothy J. Donohue
Timothy J. Donohue University of Wisconsin–Madison
Mark Gomelsky
Mark Gomelsky University of Wyoming
Mary S. Lipton
Mary S. Lipton Pacific Northwest National Laboratory
Alastair G. McEwan
Alastair G. McEwan University of Queensland
Patricia J. Kiley
Patricia J. Kiley University of Wisconsin–Madison
George M. Weinstock
George M. Weinstock The Jackson Laboratory
James P. O'Gara
James P. O'Gara University of Galway
Ellen L. Neidle
Ellen L. Neidle University of Georgia
Joanne Chory
Joanne Chory Salk Institute for Biological Studies
Erica Sodergren
Erica Sodergren The Jackson Laboratory

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