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Timothy L. Karr

D-Index & Metrics

Biology and Biochemistry

D-Index
50
Citations
10403
World Ranking
17546
National Ranking
7201

Timothy L. Karr 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 Timothy L. Karr 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: 118 publications — 11th percentile

11% of scientists in this discipline score the same or lower.

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

Timothy L. Karr 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 Timothy L. Karr 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: 50 D-Index — 11th percentile

11% of scientists in this discipline score the same or lower.

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

Overview

Timothy L. Karr is affiliated with Arizona State University in the United States. Their research primarily spans across the fields of Medicine, Biochemistry, Genetics and Molecular Biology, and Agricultural and Biological Sciences, with a substantial focus on Neurology, Insect Science, Infectious Diseases, Genetics, and Immunology.

The scientist's main topics of research include:

  • Insect symbiosis and bacterial influences
  • Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
  • Sperm and Testicular Function
  • COVID-19 Clinical Research Studies
  • Folate and B Vitamins Research
  • Neurological Disease Mechanisms and Treatments
  • Neurological Disorders and Treatments

They have contributed to various publication venues, frequently publishing work in:

  • bioRxiv (Cold Spring Harbor Laboratory)
  • Aging Cell
  • Frontiers in Plant Science
  • Genes & Genetic Systems
  • EMBO Molecular Medicine

Notable recent papers authored or co-authored by Timothy L. Karr include:

  • Dietary choline intake is necessary to prevent systems-wide organ pathology and reduce Alzheimer's disease hallmarks (2023) - Aging Cell
  • Humanization and expression of IgG and IgM antibodies in plants as potential diagnostic reagents for Valley Fever (2022) - Frontiers in Plant Science
  • The Drosophila Neprilysin 4 gene is essential for sperm function following sperm transfer to females (2021) - Genes & Genetic Systems
  • A public resource of single cell transcriptomes and multiscale networks from persons with and without Alzheimer's disease (2023) - bioRxiv (Cold Spring Harbor Laboratory)
  • Viral anti-inflammatory serpin reduces immuno-coagulopathic pathology in SARS-CoV-2 mouse models of infection (2023) - EMBO Molecular Medicine

Collaboration has been a notable aspect of their research, with frequent co-authors including Junior A. Enow, Masmudur M. Rahman, Grant McFadden, Takashi Ohsako, and Machi Shirakami.

Best Publications

  • 16S rRNA phylogenetic analysis of the bacterial endosymbionts associated with cytoplasmic incompatibility in insects

    Scott L. O'Neill;Rosanna Giordano;Angela M. E. Colbert;Timothy L. Karr

  • Bidirectional incompatibility between conspecific populations of Drosophila simulans

    Scott Leslie O'Neill;Timothy Karr

  • The histone H3.3 chaperone HIRA is essential for chromatin assembly in the male pronucleus

    Benjamin Loppin;Emilie Bonnefoy;Caroline Anselme;Anne Laurençon

  • Organization of the cytoskeleton in early Drosophila embryos.

    T L Karr;B M Alberts

  • Interspecific and intraspecific horizontal transfer of Wolbachia in Drosophila

    Lee Boyle;Scott Leslie O'Neill;Scott Leslie O'Neill;Hugh Robertson;Timothy Karr

  • A newly discovered bacterium associated with parthenogenesis and a change in host selection behavior in parasitoid wasps

    E. Zchori-Fein;Y. Gottlieb;S. E. Kelly;J. K. Brown

  • Genomic and functional evolution of the Drosophila melanogaster sperm proteome

    Stephen Dorus;Scott A. Busby;Ursula Gerike;Jeffrey Shabanowitz

  • Stage-specific expression profiling of Drosophila spermatogenesis suggests that meiotic sex chromosome inactivation drives genomic relocation of testis-expressed genes.

    Maria D. Vibranovski;Hedibert F. Lopes;Timothy L. Karr;Manyuan Long

  • Cytological analysis of fertilization and early embryonic development in incompatible crosses of Drosophila simulans.

    Craig W. Lassy;Timothy L. Karr

  • The Drosophila melanogaster sperm proteome-II (DmSP-II).

    Elizabeth R. Wasbrough;Steve Dorus;Svenja Hester;Julie Howard-Murkin

  • Heads or tails: host-parasite interactions in the Drosophila-Wolbachia system.

    Zoe Veneti;Michael E. Clark;Timothy L. Karr;Charalambos Savakis

  • Offsetting Effects of Wolbachia Infection and Heat Shock on Sperm Production in Drosophila simulans: Analyses of Fecundity, Fertility and Accessory Gland Proteins

    Rhonda R. Snook;Sophia Y. Cleland;Mariana F. Wolfner;Timothy L. Karr

  • Widespread Prevalence of Wolbachia in Laboratory Stocks and the Implications for Drosophila Research

    Michael E. Clark;Cort L. Anderson;Jessica Cande;Timothy L. Karr

  • The Drosophila l(1)zw10 gene product, required for accurate mitotic chromosome segregation, is redistributed at anaphase onset.

    B C Williams;T L Karr;J M Montgomery;M L Goldberg

  • Genetic Analysis of Viable Hsp90 Alleles Reveals a Critical Role in Drosophila Spermatogenesis

    Lin Yue;Timothy L. Karr;Debra F. Nathan;Hewson Swift

  • Intracellular sperm/egg interactions in Drosophila: a three-dimensional structural analysis of a paternal product in the developing egg.

    Timothy L. Karr

  • Organization of Wolbachia pipientis in the Drosophila fertilized egg and embryo revealed by an anti-Wolbachia monoclonal antibody.

    Hiroyuki Kose;Timothy L. Karr;Timothy L. Karr

  • Cytoplasmic incompatibility and sperm cyst infection in different Drosophila-Wolbachia associations.

    Zoe Veneti;Michael E. Clark;Sofia Zabalou;Timothy L. Karr

  • Characterization of brain microtubule proteins prepared by selective removal of mitochondrial and synaptosomal components.

    T L Karr;H D White;D L Purich

  • Wolbachia distribution and cytoplasmic incompatibility during sperm development: the cyst as the basic cellular unit of CI expression.

    Michael E Clark;Zoe Veneti;Kostas Bourtzis;Timothy L Karr

Frequent Co-Authors

Rhonda R. Snook
Rhonda R. Snook Stockholm University
Scott Leslie O'Neill
Scott Leslie O'Neill Monash University
Thomas B. Kornberg
Thomas B. Kornberg University of California, San Francisco
Yong Zhang
Yong Zhang Chinese Academy of Sciences
Manyuan Long
Manyuan Long University of Chicago
Hugh M. Robertson
Hugh M. Robertson University of Illinois at Urbana-Champaign
Martin E. Feder
Martin E. Feder University of Chicago
Sudhir Kumar
Sudhir Kumar Temple University
Mariana F. Wolfner
Mariana F. Wolfner Cornell University
Susan Lindquist
Susan Lindquist MIT

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Best Scientists Citing Timothy L. Karr

Scott Leslie O'Neill

Scott Leslie O'Neill

Monash University

Publications: 73

John H. Werren

John H. Werren

University of Rochester

Publications: 60

Mariana F. Wolfner

Mariana F. Wolfner

Cornell University

Publications: 42

Gregory D. D. Hurst

Gregory D. D. Hurst

University of Liverpool

Publications: 38

Ary A. Hoffmann

Ary A. Hoffmann

University of Melbourne

Publications: 37

Seth R. Bordenstein

Seth R. Bordenstein

Vanderbilt University

Publications: 37

William J. Sullivan

William J. Sullivan

Indiana University

Publications: 35

Richard Stouthamer

Richard Stouthamer

University of California, Riverside

Publications: 33

Michael L. Goldberg

Michael L. Goldberg

Cornell University

Publications: 32

Kostas Bourtzis

Kostas Bourtzis

International Atomic Energy Agency

Publications: 30

Markus Riegler

Markus Riegler

Western Sydney University

Publications: 29

Takema Fukatsu

Takema Fukatsu

National Institute of Advanced Industrial Science and Technology

Publications: 29

Geneviève Almouzni

Geneviève Almouzni

Institute Curie

Publications: 28

Xiao-Yue Hong

Xiao-Yue Hong

Nanjing Agricultural University

Publications: 28

Rhonda R. Snook

Rhonda R. Snook

Stockholm University

Publications: 27

Nina Wedell

Nina Wedell

University of Exeter

Publications: 27

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