World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
79
Citations
22469
World Ranking
4316
National Ranking
2101

Neal L. First 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 Neal L. First 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: 285 publications — 75th percentile

75% of scientists in this discipline score the same or lower.

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

Neal L. First 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 Neal L. First 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: 79 D-Index — 79th percentile

79% 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

  • 1996 - Wolf Prize in Agriculture for his pioneering research in the reproductive biology of livestock.
  • 1993 - The Morrison Award, American Society of Animal Science
  • 1989 - Member of the National Academy of Sciences
  • 1977 - Animal Physiology and Endocrinology Award, American Society of Animal Science

Overview

Neal L. First was affiliated with the University of Wisconsin-Madison in the United States. Their research was primarily situated within the field of Medicine, with a particular focus on Surgery as the largest subfield of study. Their work also extended into Infectious Diseases, Pulmonary and Respiratory Medicine, Public Health, Environmental and Occupational Health, and Transplantation.

The scientist contributed to multiple main topics in medical research, including COVID-19 clinical research studies, SARS-CoV-2 and COVID-19 research, gastrointestinal disorders and treatments, hernia repair and management, organ donation and transplantation, renal transplantation outcomes and treatments, and appendicitis diagnosis and management.

Their recent papers covered diverse clinical and surgical topics. Notable publications included:

  • Which appendicitis scoring system is most suitable for pregnant patients? A comparison of nine different systems, 2020, World Journal of Emergency Surgery
  • Short and mid-term SARS-CoV-2 antibody response after inactivated COVID-19 vaccine in hemodialysis and kidney transplant patients, 2022, Journal of Medical Virology
  • Endoscopic Detorsion Results in Sigmoid Volvulus: Single-Center Experience, 2020, Emergency Medicine International
  • Clinical course of COVID-19 disease in immunosuppressed renal transplant patients, 2020, TURKISH JOURNAL OF MEDICAL SCIENCES
  • Comparison of Balloon Trocar versus Telescopic Dissection Method for TEP Inguinal Hernia Repair, 2021, Journal of College of Physicians And Surgeons Pakistan

Throughout their career, Neal L. First collaborated frequently with several coauthors, including:

  • Fatih Altıntoprak
  • Emrah Akın
  • Hamad Dheir
  • Barış Mantoğlu
  • Fehmi Çelebi

Their research outputs were regularly published in venues such as:

  • Transplantation Proceedings
  • Sakarya Medical Journal
  • Turkish Journal of Trauma and Emergency Surgery
  • Emergency Medicine International
  • The Annals of Clinical and Analytical Medicine

Neal L. First received several awards during their career, including:

  • Wolf Prize in Agriculture, 1996, for pioneering research in the reproductive biology of livestock
  • The Morrison Award, American Society of Animal Science, 1993
  • Member of the National Academy of Sciences, 1989
  • Animal Physiology and Endocrinology Award, American Society of Animal Science, 1977

Best Publications

  • Capacitation of bovine sperm by heparin.

    J J Parrish;J Susko-Parrish;M A Winer;N L First

  • In vitro development of bovine one-cell embryos: Influence of glucose, lactate, pyruvate, amino acids and vitamins

    Y. Takahashi;N.L. First

  • Development of bovine embryos in vitro as affected by energy substrates.

    C F Rosenkrans;G Q Zeng;G T MCNamara;P K Schoff

  • Characterization of bovine follicular oocytes and their ability to mature in vitro.

    L. Leibfried;N. L. First

  • Inhibition of Protein Kinases after an Induced Calcium Transient Causes Transition of Bovine Oocytes to Embryonic Cycles without Meiotic Completion

    J.L. Susko-Parrish;M.L. Leibfried-Rutledge;D.L. Northey;V. Schutzkus

  • Timing of nuclear progression and protein synthesis necessary for meiotic maturation of bovine oocytes.

    M A Sirard;H M Florman;M L Leibfried-Rutledge;F L Barnes

  • The culture of bovine oocytes to obtain developmentally competent embryos.

    M A Sirard;J J Parrish;C B Ware;M L Leibfried-Rutledge

  • Effect of free amino acids and vitamins on cleavage and developmental rate of bovine zygotes in vitro.

    C F Rosenkrans;N L First

  • Development potential of bovine oocytes matured in vitro or in vivo.

    M L Leibfried-Rutledge;E S Critser;W H Eyestone;D L Northey

  • Factors Affecting Successful In Vitro Fertilization of Bovine Follicular Oocytes

    G D Ball;M L Leibfried;R W Lenz;R L Ax

  • Capacitation of bovine sperm by heparin: inhibitory effect of glucose and role of intracellular pH.

    J J Parrish;J L Susko-Parrish;N L First

  • The incidence and possible relevance of Y-linked microdeletions in babies born after intracytoplasmic sperm injection and their infertile fathers

    M.G. Kent-First;S. Kol;A. Muallem;R. Ofir

  • Production of calves by transfer of nuclei from cultured inner cell mass cells.

    Michelle Sims;N. L. First

  • Action of ionophore A23187 at the cellular level. Separation of effects at the plasma and mitochondrial membranes.

    D F Babcock;N L First;H A Lardy

  • Microtubule Organization in the Cow during Fertilization, Polyspermy, Parthenogenesis, and Nuclear Transfer: The Role of the Sperm Aster

    C.S. Navara;N.L. First;G. Schatten

  • Embryonic transcription in in vitro cultured bovine embryos.

    F. L. Barnes;N. L. First

  • Age dependence of bovine oocyte activation.

    C B Ware;F L Barnes;M Maiki-Laurila;N L First

  • Effect of heparin and chondroitin sulfate on the acrosome reaction and fertility of bovine sperm in vitro.

    J.J. Parrish;J.L. Susko-Parrish;N.L. First

  • Chondroitin sulfate facilitates an acrosome reaction in bovine spermatozoa as evidenced by light microscopy, electron microscopy and in vitro fertilization.

    R W Lenz;G D Ball;J K Lohse;N L First

  • The Incidence and Possible Relevance of Y-Linked Microdeletions in Babies Born After Intracytoplasmic Sperm Injection and Their Infertile Fathers

    M.G. Kent-First;S. Kol;A. Muallem;R. Ofir

Frequent Co-Authors

Randall S. Prather
Randall S. Prather University of Missouri
Henry A. Lardy
Henry A. Lardy University of Wisconsin–Madison
Marc-André Sirard
Marc-André Sirard Université Laval
Gerald Schatten
Gerald Schatten University of Pittsburgh
Gerd G. Maul
Gerd G. Maul The Wistar Institute
David L. Garbers
David L. Garbers The University of Texas Southwestern Medical Center
Fuller W. Bazer
Fuller W. Bazer Texas A&M University
Marisa S. Bartolomei
Marisa S. Bartolomei University of Pennsylvania
W.R. Butler
W.R. Butler Cornell University
Robert H. Foote
Robert H. Foote Cornell University

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