World's Best Scientists 2026 revealed!

D-Index & Metrics

Chemistry

D-Index
65
Citations
17479
World Ranking
7575
National Ranking
503

Takuo Okuda 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 Takuo Okuda 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: 333 publications — 70th percentile

70% of scientists in this discipline score the same or lower.

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

Takuo Okuda 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 Takuo Okuda 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: 65 D-Index — 58th percentile

58% of scientists in this discipline score the same or lower.

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

Overview

Takuo Okuda is affiliated with Okayama University in Japan. Their academic profile reflects an active engagement with research and scholarship within this institution.

There are no recent papers listed under their name, and no specific frequent co-authors or publication venues are noted for their work.

Similarly, details regarding book publications and awards won by Takuo Okuda are not available. Their main fields of study and subfields covered are also unrecorded in the accessible data.

The lack of detailed information on specific research topics or publication records limits a more granular overview of their scientific contributions or thematic interests.

Despite the limited publicly available data, Takuo Okuda's association with a recognized university suggests ongoing involvement in academic and research activities within the Japanese higher education system.

Best Publications

  • Two new flavonoids and other constituents in licorice root: their relative astringency and radical scavenging effects.

    Tsutomu Hatano;Harumi Kagawa;Taeko Yasuhara;Takuo Okuda

  • Effects of the Interaction of Tannins with Co-existing Substances. VI. : Effects of Tannins and Related Polyphenols on Superoxide Anion Radical, and on 1, 1-Diphenyl-2-picrylhydrazyl Radical

    Tsutomu Hatano;Rei Edamatsu;Midori Hiramatsu;Akitane Mori

  • Systematics and health effects of chemically distinct tannins in medicinal plants.

    Takuo Okuda

  • Antitumor promoting activity of (−)-epigallocatechin gallate, the main constituent of “Tannin” in green tea

    Shigeru Yoshizawa;Takahiko Horiuchi;Hirota Fujiki;Takashi Yoshida

  • Tannins of Constant Structure in Medicinal and Food Plants—Hydrolyzable Tannins and Polyphenols Related to Tannins

    Takuo Okuda;Hideyuki Ito

  • Studies on Inhibition Mechanism of Autoxidation by Tannins and Flavonoids. V. Radical-Scavenging Effects of Tannins and Related Polyphenols on 1, 1-Diphenyl-2-picrylhydrazyl Radical

    Takashi Yoshida;Kazuko Mori;Tsutomu Hatano;Tomoko Okumura

  • Studies on the activities of tannins and related compounds from medicinal plants and drugs. I. Inhibitory effects on lipid peroxidation in mitochondria and microsomes of liver.

    Takuo Okuda;Yoshiyuki Kimura;Takashi Yoshida;Tsutomu Hatano

  • Ellagitannins as active constituents of medicinal plants.

    Takuo Okuda;Takashi Yoshida;Tsutomu Hatano

  • Inhibition of herpes simplex virus infection by tannins and related compounds.

    Kunihiko Fukuchi;Hiroshi Sakagami;Takuo Okuda;Tsutomu Hatano

  • Inhibition of human immunodeficiency viral replication by tannins and related compounds.

    Hideki Nakashima;Tsutomu Murakami;Naoki Yamamoto;Hiroshi Sakagami

  • Tannis of Casuarina and Stachyurus species. Part 1. Structures of pendunculagin, casuarictin, strictinin, casuarinin, casuariin, and stachyurin

    Takuo Okuda;Takashi Yoshida;Mariko Ashida;Kazufumi Yazaki

  • Inhibitory effect of (-)-epigallocatechin gallate on carcinogenesis with N-ethyl-N'-nitro-N-nitrosoguanidine in mouse duodenum.

    Yoshihiro Fujita;Tetsuro Yamane;Masumi Tanaka;Katsuya Kuwata

  • New Methods of Analyzing Tannins

    Takuo Okuda;Takashi Yoshida;Tsutomu Hatano

  • Inhibitory Effects of Various Flavonoids Isolated from Leaves of Persimmon on Angiotensin-Converting Enzyme Activity

    Kenji Kameda;Takeshi Takaku;Hiromichi Okuda;Yoshiyuki Kimura

  • Anticarcinogenic effects of (-)-epigallocatechin gallate.

    Hirota Fujiki;Seiji Yoshizawa;Takahiko Horiuchi;Masami Suganuma

  • Inhibitory effect of tannins on direct-acting mutagens

    Takuo Okuda;Kazuko Mori;Hikoya Hayatsu

  • Ellagitannins of the casuarinaceae, stachyuraceae and myrtaceae

    Takuo Okuda;Takashi Yoshida;Tsutomu Hatano;Kazufumi Yazaki

  • Phenolic constituents of licorice. II. Structures of licopyranocoumarin, licoarylcoumarin and glisoflavone, and inhibitory effects of licorice phenolics on xanthine oxidase.

    Tsutomu Hatano;Taeko Yasuhara;Toshiyuki Fukuda;Tadataka Noro

  • Hydrolyzable tannins and related polyphenols.

    Takuo Okuda;Takashi Yoshida;Tsutomu Hatano

  • Circular dichroism of hydrolysable tannins-I ellagitannins and gallotannins

    Takuo Okuda;Takashi Yoshida;Tsutomu Hatano;Toshitaka Koga

Frequent Co-Authors

Takashi Yoshida
Takashi Yoshida Matsuyama University
Tsutomu Hatano
Tsutomu Hatano Okayama University
Kazufumi Yazaki
Kazufumi Yazaki Kyoto University
Hideyuki Ito
Hideyuki Ito Okayama Prefectural University
Hiromichi Okuda
Hiromichi Okuda Prefectural University of Kumamoto
Hiroshi Sakagami
Hiroshi Sakagami Meikai University
Hirota Fujiki
Hirota Fujiki National Cancer Research Institute, UK
Masao Hattori
Masao Hattori University of Toyama
Takashi Sugimura
Takashi Sugimura National Cancer Centre
Tsuneo Namba
Tsuneo Namba University of Toyama

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