World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
118
Citations
50344
World Ranking
700
National Ranking
444

Ryuzo Yanagimachi 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 Ryuzo Yanagimachi 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: 474 publications — 94th percentile

94% of scientists in this discipline score the same or lower.

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

Ryuzo Yanagimachi 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 Ryuzo Yanagimachi 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: 118 D-Index — 97th percentile

97% 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

  • 2001 - Member of the National Academy of Sciences
  • 1997 - Polish Academy of Science

Overview

Ryuzo Yanagimachi was affiliated with the University of Hawaii at Manoa in the United States. Their research focused primarily within the field of medicine, with a specialized emphasis on reproductive medicine and related subfields such as public health, environmental and occupational health, endocrinology, diabetes and metabolism, pediatrics, perinatology, child health, and genetics.

The main topics covered in Yanagimachi's work included reproductive biology and fertility, sperm and testicular function, hormonal and reproductive studies, genetic and clinical aspects of sex determination and chromosomal abnormalities, reproductive physiology in livestock, assisted reproductive technology and twin pregnancy, and prenatal screening and diagnostics.

Yanagimachi authored and co-authored several recent papers, reflecting ongoing contributions to various aspects of reproductive science. These papers included:

  • Acrosin is essential for sperm penetration through the zona pellucida in hamsters (2020, Proceedings of the National Academy of Sciences)
  • Mysteries and unsolved problems of mammalian fertilization and related topics (2022, Biology of Reproduction)
  • Mitochondrial Transfer into Human Oocytes Improved Embryo Quality and Clinical Outcomes in Recurrent Pregnancy Failure Cases (2023, International Journal of Molecular Sciences)
  • Both Cauda and Caput Epididymal Sperm Are Capable of Supporting Full-Term Development in FVB and CD-1 Mice (2020, Developmental Cell)
  • Sperm acrosome status before and during fertilization in the Chinese hamster (Cricetulus griseus), and observation of oviductal vesicles and globules (2021, Molecular Reproduction and Development)

Frequent coauthors associated with Yanagimachi's research included Miwa Tamura-Nakano, Michiko Hirose, Arata Honda, J. Fulka, and Shogo Matoba.

Publication venues where Yanagimachi's research appeared included:

  • Proceedings of the National Academy of Sciences
  • Biology of Reproduction
  • International Journal of Molecular Sciences
  • Developmental Cell
  • Molecular Reproduction and Development

Throughout their career, Yanagimachi was recognized with several honors, including membership in the National Academy of Sciences in 2001 and affiliation with the Polish Academy of Science in 1997.

Best Publications

  • Full-term development of mice from enucleated oocytes injected with cumulus cell nuclei

    T Wakayama;Anthony C F Perry;Anthony C F Perry;M Zuccotti;M Zuccotti;K R Johnson

  • Intracytoplasmic sperm injection in the mouse.

    Yasuyuki Kimura;R. Yanagimachi

  • The Use of Zona-Free Animal Ova as a Test-System for the Assessment of the Fertilizing Capacity of Human Spermatozoa

    Yanagimachi R;Yanagimachi H;Rogers Bj

  • Mechanisms of Fertilization in Mammals

    R. Yanagimachi

  • Epigenetic Instability in ES Cells and Cloned Mice

    David Humpherys;Kevin Eggan;Hidenori Akutsu;Konrad Hochedlinger

  • Hybrid vigor, fetal overgrowth, and viability of mice derived by nuclear cloning and tetraploid embryo complementation

    Kevin Eggan;Hidenori Akutsu;Janet Loring;Laurie Jackson-Grusby

  • Calcium dependence of the acrosome reaction and activation of guinea pig spermatozoa.

    R. Yanagimachi;N. Usui

  • Mammalian transgenesis by intracytoplasmic sperm injection

    Ryuzo Yanagimachi

  • Mice cloned from embryonic stem cells.

    Teruhiko Wakayama;Ivan Rodriguez;Anthony C. F. Perry;Ryuzo Yanagimachi

  • Cloning of male mice from adult tail-tip cells

    Teruhiko Wakayama;Ryuzo Yanagimachi

  • Incomplete reactivation of Oct4-related genes in mouse embryos cloned from somatic nuclei.

    Alex Bortvin;Kevin Eggan;Helen Skaletsky;Helen Skaletsky;Hidenori Akutsu

  • The movement of golden hamster spermatozoa before and after capacitation.

    R. Yanagimachi

  • Is calcium ionophore a universal activator for unfertilised eggs

    Richard A. Steinhardt;David Epel;Edward J. Carroll;Ryuzo Yanagimachi

  • Abnormal gene expression in cloned mice derived from embryonic stem cell and cumulus cell nuclei

    David Humpherys;Kevin Eggan;Hidenori Akutsu;Adam Friedman

  • Ultrastructural localization of lectin-binding sites on the zonae pellucidae and plasma membranes of mammalian eggs.

    G L Nicolson;R Yanagimachi;H Yanagimachi

  • Direct analysis of the chromosome constitution of human spermatozoa

    Edwina Rudak;Patricia A. Jacobs;Ryuzo Yanagimachi

  • Mouse oocytes injected with testicular spermatozoa or round spermatids can develop into normal offspring

    Y. Kimura;R. Yanagimachi

  • Microsurgical Injection of Spermatozoa into Hamster Eggs with Subsequent Transformation of Sperm Nuclei into Male Pronuclei

    Uehara T;Yanagimachi R

  • Development of normal offspring from oocytes injected with freeze-dried spermatozoa

    Teruhiko Wakayama;Ryuzo Yanagimachi

  • Cloned mice have an obese phenotype not transmitted to their offspring

    Kellie L.K. Tamashiro;Teruhiko Wakayama;Hidenori Akutsu;Yukiko Yamazaki

Frequent Co-Authors

Teruhiko Wakayama
Teruhiko Wakayama University of Yamanashi
Gary N. Cherr
Gary N. Cherr University of California, Davis
John R. McCarrey
John R. McCarrey The University of Texas at San Antonio
Anthony C.F. Perry
Anthony C.F. Perry University of Bath
Atsuo Ogura
Atsuo Ogura University of Tsukuba
Randall R. Sakai
Randall R. Sakai University of Cincinnati
Garth L. Nicolson
Garth L. Nicolson University of Helsinki
Marisa S. Bartolomei
Marisa S. Bartolomei University of Pennsylvania
Nechama S. Kosower
Nechama S. Kosower Tel Aviv University
Kevin Eggan
Kevin Eggan Harvard University

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