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James C. Ryan

D-Index & Metrics

Biology and Biochemistry

D-Index
43
Citations
7721
World Ranking
19387
National Ranking
7915

James C. Ryan 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 James C. Ryan 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: 108 publications — 8th percentile

8% of scientists in this discipline score the same or lower.

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

James C. Ryan 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 James C. Ryan 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: 43 D-Index — 1st percentile

1% of scientists in this discipline score the same or lower.

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

Overview

James C. Ryan is affiliated with the University of California, San Francisco in the United States. Their research primarily focuses on the field of Medicine, with significant contributions to several subfields including Surgery, Infectious Diseases, Pulmonary and Respiratory Medicine, Immunology, and Economics and Econometrics.

Their work covers various important topics, such as COVID-19 Clinical Research Studies, Colorectal Cancer Screening and Detection, Gastric Cancer Management and Outcomes, Radiomics and Machine Learning in Medical Imaging, Bone fractures and treatments, Pelvic and Acetabular Injuries, and Trauma and Emergency Care Studies.

Notable recent papers authored by James C. Ryan include:

  • Artificial Intelligence for Real-Time Prediction of the Histology of Colorectal Polyps by General Endoscopists, 2024, Annals of Internal Medicine
  • Fate of the Uninsured Ankle Fracture: Significant Delays in Treatment Result in an Increased Risk of Surgical Site Infection, 2020, Journal of Orthopaedic Trauma
  • Skin closure with surgical staples in ankle fractures: a safe and reliable method, 2020, International Orthopaedics
  • Association of the patterns of use of medications with mortality of COVID-19 infection: a hospital-based observational study, 2021, BMJ Open
  • Treatable metabolic and inflammatory abnormalities in Post COVID Syndrome (PCS) define the transcriptomic basis for persistent symptoms: Lessons from CIRS, 2021, Medical Research Archives

Frequent co-authors collaborating with James C. Ryan include:

  • Boris A. Zelle
  • Case W. Martin
  • John Cabot
  • Leah Griffin
  • Travis S. Bullock

The scientist's work has been published in a variety of venues such as:

  • Annals of Internal Medicine
  • Journal of Orthopaedic Trauma
  • International Orthopaedics
  • BMJ Open
  • Medical Research Archives

Best Publications

  • Microarray validation: factors influencing correlation between oligonucleotide microarrays and real-time PCR

    Jeanine S. Morey;James C. Ryan;Frances M. Van Dolah

  • Binding and uptake of H-ferritin are mediated by human transferrin receptor-1

    Li Li;Celia J. Fang;James C. Ryan;Eréne C. Niemi

  • Differential expression of ZAP-70 and Syk protein tyrosine kinases, and the role of this family of protein tyrosine kinases in TCR signaling.

    A. C. Chan;N. S. C. Van Oers;A. Tran;L. Turka

  • Natural killer cell cytolytic activity is inhibited by NKG2-A and activated by NKG2-C.

    J P Houchins;L L Lanier;E C Niemi;J H Phillips

  • Mouse Ly-49A Interrupts Early Signaling Events in Natural Killer Cell Cytotoxicity and Functionally Associates with the SHP-1 Tyrosine Phosphatase

    Mary C. Nakamura;Eréne C. Niemi;Mark J. Fisher;Leonard D. Shultz

  • Cloning and characterization of a novel mouse myeloid DAP12-associated receptor family

    Michael R. Daws;Lewis L. Lanier;William E. Seaman;James C. Ryan

  • Beyond insulin resistance: Innate immunity in nonalcoholic steatohepatitis

    Jacquelyn J. Maher;Pablo Leon;Pablo Leon;James C. Ryan;James C. Ryan

  • Molecular cloning of the NK1.1 antigen, a member of the NKR-P1 family of natural killer cell activation molecules.

    J C Ryan;J Turck;E C Niemi;W M Yokoyama

  • cDNA cloning of mouse NKR-P1 and genetic linkage with LY-49. Identification of a natural killer cell gene complex on mouse chromosome 6.

    W. M. Yokoyama;J. C. Ryan;J. J. Hunter;H. R. C. Smith

  • Mouse Ly-49D Recognizes H-2Dd and Activates Natural Killer Cell Cytotoxicity

    Mary C. Nakamura;Paul A. Linnemeyer;Eréne C. Niemi;Llewellyn H. Mason

  • Divergent functions of lectin-like receptors on NK cells.

    James C. Ryan;William E. Seaman

  • NKR-P1, an activating molecule on rat natural killer cells, stimulates phosphoinositide turnover and a rise in intracellular calcium.

    J C Ryan;E C Niemi;R D Goldfien;J C Hiserodt

  • NKR-P1A is a target-specific receptor that activates natural killer cell cytotoxicity.

    J C Ryan;E C Niemi;M C Nakamura;W E Seaman

  • An autosomal dominant locus, Nka, mapping to the Ly-49 region of a rat natural killer (NK) gene complex, controls NK cell lysis of allogeneic lymphocytes.

    E Dissen;J C Ryan;W E Seaman;S Fossum

  • Gene Expression in Florida Red Tide Dinoflagellate Karenia brevis: Analysis of an Expressed Sequence Tag Library and Development of DNA Microarray

    Kristy B. Lidie;Kristy B. Lidie;James C. Ryan;Michele Barbier;Frances M. Van Dolah;Frances M. Van Dolah

  • Molecular Cloning of the cDNA Encoding pp36, a Tyrosine-phosphorylated Adaptor Protein Selectively Expressed by T Cells and Natural Killer Cells

    John R. Weber;Sigurd Ørstavik;Knut Martin Torgersen;Niels Christian Danbolt

  • IL-33 promotes growth and liver metastasis of colorectal cancer in mice by remodeling the tumor microenvironment and inducing angiogenesis.

    Yu Zhang;Celestia Davis;Sapana Shah;Daniel Hughes

  • INTERFERON GAMMA DERIVED FROM CD4+ T CELLS IS SUFFICIENT TO MEDIATE T HELPER CELL TYPE 1 DEVELOPMENT

    Adil E. Wakil;Zhi-En Wang;James C. Ryan;Deborah J. Fowell

  • A Visual Pigment Expressed in Both Rod and Cone Photoreceptors

    Jian Xing Ma;Sergey Znoiko;Kashelle L. Othersen;James C. Ryan

  • Expression of the Platelet Receptor GPVI Confers Signaling via the Fc Receptor γ-Chain in Response to the Snake Venom Convulxin but Not to Collagen

    Yun-Min Zheng;Changdong Liu;Hong Chen;Darren Locke

Frequent Co-Authors

Mary C. Nakamura
Mary C. Nakamura University of California, San Francisco
William E. Seaman
William E. Seaman University of California, San Francisco
Lewis L. Lanier
Lewis L. Lanier University of California, San Francisco
Rosalie K. Crouch
Rosalie K. Crouch Medical University of South Carolina
Randall S. Wells
Randall S. Wells Chicago Zoological Society
Jian Xing Ma
Jian Xing Ma University of Oklahoma Health Sciences Center
John R. Kucklick
John R. Kucklick National Institute of Standards and Technology
Luigi Abelli
Luigi Abelli University of Ferrara
Claude Szpirer
Claude Szpirer Université Libre de Bruxelles
Dominique Gauguier
Dominique Gauguier McGill University

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Best Scientists Citing James C. Ryan

Lewis L. Lanier

Lewis L. Lanier

University of California, San Francisco

Publications: 49

Wayne M. Yokoyama

Wayne M. Yokoyama

Washington University in St. Louis

Publications: 41

David H. Raulet

David H. Raulet

University of California, Berkeley

Publications: 29

Arthur Weiss

Arthur Weiss

University of California, San Francisco

Publications: 26

Marco Colonna

Marco Colonna

Washington University in St. Louis

Publications: 25

Klas Kärre

Klas Kärre

Karolinska Institute

Publications: 23

Weiguo Zhang

Weiguo Zhang

Duke University

Publications: 21

John R. Ortaldo

John R. Ortaldo

National Institutes of Health

Publications: 21

Eric Vivier

Eric Vivier

Aix-Marseille University

Publications: 19

Anthony A. Scalzo

Anthony A. Scalzo

University of Western Australia

Publications: 19

Werner Held

Werner Held

University of Lausanne

Publications: 18

Dixie L. Mager

Dixie L. Mager

University of British Columbia

Publications: 18

Daniel M. Davis

Daniel M. Davis

University of Manchester

Publications: 17

Eric O. Long

Eric O. Long

National Institutes of Health

Publications: 16

Peter Parham

Peter Parham

Stanford University

Publications: 16

Malcolm K. Jones

Malcolm K. Jones

University of Queensland

Publications: 16

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