World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
67
Citations
11426
World Ranking
8410
National Ranking
3785

Chemistry

D-Index
67
Citations
11253
World Ranking
7130
National Ranking
2116

Paul W. Ludden publication distribution in Chemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Chemistry in 2026. The highlighted bar marks where Paul W. Ludden sits on this spectrum.

61–80 publications: 66 scientists 81–100 publications: 302 scientists 101–120 publications: 623 scientists 121–140 publications: 918 scientists 141–160 publications: 1,218 scientists 161–180 publications: 1,350 scientists 181–200 publications: 1,344 scientists 201–220 publications: 1,281 scientists 221–240 publications: 1,216 scientists 241–260 publications: 1,100 scientists 261–280 publications: 979 scientists 281–300 publications: 939 scientists 301–320 publications: 764 scientists 321–340 publications: 643 scientists 341–360 publications: 628 scientists 361–380 publications: 522 scientists 381–400 publications: 459 scientists 401–420 publications: 397 scientists 421–440 publications: 327 scientists 441–460 publications: 270 scientists 461–480 publications: 265 scientists 481–500 publications: 252 scientists 501–520 publications: 201 scientists 521–540 publications: 185 scientists 541–560 publications: 148 scientists 561–580 publications: 148 scientists 581–600 publications: 132 scientists 601–620 publications: 114 scientists 621–640 publications: 104 scientists 641–660 publications: 91 scientists 661–680 publications: 92 scientists 681–700 publications: 73 scientists 701–720 publications: 57 scientists 721–740 publications: 54 scientists 741–760 publications: 67 scientists 761–780 publications: 45 scientists 781–800 publications: 46 scientists 801–820 publications: 39 scientists 821–840 publications: 32 scientists 841–860 publications: 36 scientists 861–880 publications: 29 scientists 881–900 publications: 26 scientists 901–920 publications: 24 scientists 921–940 publications: 14 scientists 941–960 publications: 23 scientists 961–980 publications: 28 scientists 981–1,000 publications: 15 scientists 1,001–1,020 publications: 29 scientists 1,021–1,040 publications: 12 scientists 1,041–1,060 publications: 19 scientists 1,061–1,080 publications: 12 scientists 1,081–1,100 publications: 6 scientists 1,101–1,120 publications: 8 scientists 1,121–1,140 publications: 12 scientists 1,141–1,160 publications: 5 scientists 1,161–1,180 publications: 6 scientists 1,181–1,200 publications: 14 scientists 1,201–1,220 publications: 7 scientists 1,221–1,240 publications: 2 scientists 1,241–1,260 publications: 6 scientists 1,261–1,280 publications: 4 scientists 1,281–1,294 publications: 6 scientists 1,295+ publications: 100 scientists
61 publications 1,295+

This scientist: 178 publications — 24th percentile

24% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,295 publications or more.

Paul W. Ludden D-index placement in Chemistry in 2026

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

40–41 D-Index: 289 scientists 42–43 D-Index: 612 scientists 44–45 D-Index: 808 scientists 46–47 D-Index: 776 scientists 48–49 D-Index: 835 scientists 50–51 D-Index: 861 scientists 52–53 D-Index: 872 scientists 54–55 D-Index: 933 scientists 56–57 D-Index: 1,051 scientists 58–59 D-Index: 930 scientists 60–61 D-Index: 882 scientists 62–63 D-Index: 834 scientists 64–65 D-Index: 731 scientists 66–67 D-Index: 775 scientists 68–69 D-Index: 683 scientists 70–71 D-Index: 646 scientists 72–73 D-Index: 561 scientists 74–75 D-Index: 501 scientists 76–77 D-Index: 437 scientists 78–79 D-Index: 388 scientists 80–81 D-Index: 354 scientists 82–83 D-Index: 292 scientists 84–85 D-Index: 275 scientists 86–87 D-Index: 254 scientists 88–89 D-Index: 235 scientists 90–91 D-Index: 185 scientists 92–93 D-Index: 192 scientists 94–95 D-Index: 155 scientists 96–97 D-Index: 163 scientists 98–99 D-Index: 125 scientists 100–101 D-Index: 105 scientists 102–103 D-Index: 105 scientists 104–105 D-Index: 112 scientists 106–107 D-Index: 88 scientists 108–109 D-Index: 68 scientists 110–111 D-Index: 69 scientists 112–113 D-Index: 65 scientists 114–115 D-Index: 79 scientists 116–117 D-Index: 61 scientists 118–119 D-Index: 44 scientists 120–121 D-Index: 37 scientists 122–123 D-Index: 40 scientists 124–125 D-Index: 33 scientists 126–127 D-Index: 26 scientists 128–129 D-Index: 34 scientists 130–131 D-Index: 35 scientists 132–133 D-Index: 25 scientists 134–135 D-Index: 27 scientists 136–137 D-Index: 17 scientists 138–139 D-Index: 16 scientists 140–141 D-Index: 20 scientists 142–143 D-Index: 20 scientists 144–145 D-Index: 15 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 9 scientists 150–151 D-Index: 16 scientists 152–153 D-Index: 11 scientists 154–155 D-Index: 9 scientists 156–157 D-Index: 3 scientists 158 D-Index: 3 scientists 159+ D-Index: 98 scientists
40 D-Index 159+

This scientist: 67 D-Index — 62nd percentile

62% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 159 D-Index or more.

Research.com Recognitions

  • 2003 - Fellow of the American Association for the Advancement of Science (AAAS)

Overview

Paul W. Ludden is affiliated with Southern Methodist University in the United States. The academic profile does not list specific recent papers, co-authors, publication venues, or book publications associated with their work.

The scientist has been recognized as a Fellow of the American Association for the Advancement of Science (AAAS), an honor awarded in 2003.

No detailed information is available regarding their main fields of study, subfields, or principal topics of research.

Best Publications

  • Biosynthesis of the iron-molybdenum cofactor of nitrogenase.

    Luis M. Rubio;Paul W. Ludden

  • Life on carbon monoxide: X-ray structure of Rhodospirillum rubrum Ni-Fe-S carbon monoxide dehydrogenase.

    Catherine L. Drennan;Jongyun Heo;Michael D. Sintchak;Eric Schreiter

  • Carbon monoxide-dependent growth of Rhodospirillum rubrum.

    R L Kerby;P W Ludden;G P Roberts

  • Maturation of Nitrogenase: a Biochemical Puzzle

    Luis M. Rubio;Paul W. Ludden

  • Characterization of the region encoding the CO-induced hydrogenase of Rhodospirillum rubrum.

    J D Fox;Y He;D Shelver;G P Roberts

  • Covalent modification of the iron protein of nitrogenase from Rhodospirillum rubrum by adenosine diphosphoribosylation of a specific arginine residue

    Mark R. Pope;Scott A. Murrell;Paul W. Ludden

  • Activating factor for the iron protein of nitrogenase from Rhodospirillum rubrum

    Paul W. Ludden;R. H. Burris

  • Regulation of Biological Nitrogen Fixation

    Cale M. Halbleib;Paul W. Ludden

  • Characterization of the CO-induced, CO-tolerant hydrogenase from Rhodospirillum rubrum and the gene encoding the large subunit of the enzyme.

    J D Fox;R L Kerby;G P Roberts;P W Ludden

  • Genetic and physiological characterization of the Rhodospirillum rubrum carbon monoxide dehydrogenase system.

    R L Kerby;S S Hong;S A Ensign;L J Coppoc

  • Effect of ammonia, darkness, and phenazine methosulfate on whole-cell nitrogenase activity and Fe protein modification in Rhodospirillum rubrum

    Unknown

  • Characterization of the CO oxidation/H2 evolution system of Rhodospirillum rubrum. Role of a 22-kDa iron-sulfur protein in mediating electron transfer between carbon monoxide dehydrogenase and hydrogenase.

    S A Ensign;P W Ludden

  • Regulation of Nitrogenase Activity by Reversible ADP Ribosylation

    Paul W. Ludden;Gary P. Roberts

  • In vivo nickel insertion into the carbon monoxide dehydrogenase of Rhodospirillum rubrum: molecular and physiological characterization of cooCTJ.

    R L Kerby;P W Ludden;G P Roberts

  • In vitro synthesis of the iron-molybdenum cofactor of nitrogenase. Purification and characterization of NifB cofactor, the product of NIFB protein.

    V K Shah;J R Allen;N J Spangler;P W Ludden

  • Identification of the V factor needed for synthesis of the iron-molybdenum cofactor of nitrogenase as homocitrate.

    Timothy R. Hoover;Andrew D. Robertson;Ronald L. Cerny;Roger N. Hayes

  • Homocitrate is a component of the iron-molybdenum cofactor of nitrogenase.

    Timothy R. Hoover;Juan Imperial;Paul W. Ludden;Vinod K. Shah

  • Genes coding for the reversible ADP-ribosylation system of dinitrogenase reductase from Rhodospirillum rubrum.

    Wayne P. Fitzmaurice;Leonard L. Saari;Robert G. Lowery;Paul W. Ludden

  • Mutations in the draT and draG genes of Rhodospirillum rubrum result in loss of regulation of nitrogenase by reversible ADP-ribosylation.

    Jihong Liang;G. M. Nielsen;D. P. Lies;R. H. Burris

  • Regulation of nitrogen fixation in Azospirillum brasilense

    Yaoping Zhang;Robert H Burris;Paul W Ludden;Gary P Roberts

  • Regulation of carbon monoxide dehydrogenase and hydrogenase in Rhodospirillum rubrum: effects of CO and oxygen on synthesis and activity.

    D Bonam;L Lehman;G P Roberts;P W Ludden

  • Purification and properties of the activating enzyme for iron protein of nitrogenase from the photosynthetic bacterium Rhodospirillum rubrum.

    L L Saari;E W Triplett;P W Ludden

Frequent Co-Authors

Gary P. Roberts
Gary P. Roberts University of Wisconsin–Madison
Vinod K. Shah
Vinod K. Shah University of Wisconsin–Madison
Robert H. Burris
Robert H. Burris University of Wisconsin–Madison
Dennis R. Dean
Dennis R. Dean Virginia Tech
Philip J. Stephens
Philip J. Stephens University of Southern California
Eric W. Triplett
Eric W. Triplett University of Florida
Stephen P. Cramer
Stephen P. Cramer Search for Extraterrestrial Intelligence
James Borneman
James Borneman University of California, Riverside
Daniel J. Arp
Daniel J. Arp Oregon State University

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