World's Best Scientists 2026 revealed!
Tadashi Okada

Tadashi Okada

D-Index & Metrics

Chemistry

D-Index
57
Citations
10139
World Ranking
11241
National Ranking
828

Tadashi Okada 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 Tadashi Okada 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: 244 publications — 48th percentile

48% of scientists in this discipline score the same or lower.

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

Tadashi Okada 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 Tadashi Okada 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: 57 D-Index — 39th percentile

39% of scientists in this discipline score the same or lower.

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

Overview

Tadashi Okada is affiliated with Osaka University in Japan. Their research primarily spans the fields of Biochemistry, Genetics and Molecular Biology, and Medicine, contributing substantially across these domains.

The scientist's subfields of study include Molecular Biology, Genetics, Nephrology, Pulmonary and Respiratory Medicine, and Physiology. The breadth of these areas highlights a focus on both cellular mechanisms and clinical implications, especially related to kidney conditions and genetic syndromes.

Their main research topics focus on Genetic and Kidney Cyst Diseases, Renal and related cancers, Genetic Syndromes and Imprinting, Dialysis and Renal Disease Management, Chronic Kidney Disease and Diabetes, Potassium and Related Disorders, and Adipose Tissue and Metabolism. These topics indicate a significant interest in kidney function and disease, genetic factors influencing these conditions, and metabolic processes.

Okada's recent publications exemplify their research directions with articles such as:

  • Preservation of kidney function irrelevant of total kidney volume growth rate with tolvaptan treatment in patients with autosomal dominant polycystic kidney disease, 2021, Clinical and Experimental Nephrology
  • Effect of tolvaptan in Japanese patients with autosomal dominant polycystic kidney disease: a post hoc analysis of TEMPO 3:4 and TEMPO Extension Japan, 2021, Clinical and Experimental Nephrology
  • CREG1 administration stimulates BAT thermogenesis and improves diet-induced obesity in mice, 2021, The Journal of Biochemistry
  • Effect of Nonsupplemented Low-Protein Diet on the Initiation of Renal Replacement Therapy in Stage 4 and 5 Chronic Kidney Disease: A Retrospective Multicenter Cohort Study in Japan, 2023, Journal of Renal Nutrition
  • Efficacy and safety of oral tolvaptan in patients undergoing hemodialysis: a Phase 2, double-blind, randomized, placebo-controlled trial, 2020, Nephrology Dialysis Transplantation

These papers reflect an emphasis on therapeutic interventions for kidney disease as well as metabolic regulation in obesity models.

Frequent coauthors collaborating with Tadashi Okada include

  • Shigeo Horie
  • Satoru Muto
  • Yoshiyuki Shibasaki
  • Tatsuki Ibuki
  • Haruna Kawano

These collaborations appear across multiple recent projects, indicating ongoing research partnerships within related specialties.

The scientist's work frequently appears in several publication venues, notably:

  • Clinical and Experimental Nephrology
  • Journal of Renal Nutrition
  • The Journal of Biochemistry
  • Nephrology Dialysis Transplantation
  • Journal of Nutritional Science and Vitaminology

This range of journals shows a blend of clinical and biochemical research dissemination aligned with their interdisciplinary expertise.

Best Publications

  • Linkage and Solvent Dependence of Photoinduced Electron Transfer in Zincporphyrin-C60 Dyads

    Hiroshi Imahori;Kiyoshi Hagiwara;Masanori Aoki;Tsuyoshi Akiyama

  • Ultrafast fluorescence detection in tris(2,2'-bipyridine)ruthenium(II) complex in solution: relaxation dynamics involving higher excited states.

    Achikanath C. Bhasikuttan;Masaya Suzuki;and Satoru Nakashima;Tadashi Okada

  • The bell-shaped energy gap dependence of the charge recombination reaction of geminate radical ion pairs produced by fluorescence quenching reaction in acetonitrile solution

    Noboru Mataga;Tsuyoshi Asahi;Yu Kanda;Tadashi Okada

  • Effect of Surface Structures on Photocatalytic CO2 Reduction Using Quantized CdS Nanocrystallites

    Hiroaki Fujiwara;Hiroji Hosokawa;Kei Murakoshi;Yuji Wada

  • Light harvesting by a periodic mesoporous organosilica chromophore.

    Shinji Inagaki;Osamu Ohtani;Yasutomo Goto;Kentaro Okamoto

  • Comparison of reorganization energies for intra- and intermolecular electron transfer.

    Hiroshi Imahori;Hiroko Yamada;Dirk M. Guldi;Yoshito Endo

  • Charge-transfer rates in symmetric and symmetry-disturbed derivatives of 9,9'-bianthryl

    N. Mataga;H. Yao;T. Okada;W. Rettig

  • Electronic processes in hetero-excimers and the mechanism of fluorescence quenching

    Noboru Mataga;Tadashi Okada;Noriyuki Yamamoto

  • A chemical approach towards the photosynthetic reaction center

    Kazuhiro Maruyama;Atsuhiro Osuka;Noboru Mataga

  • Intramolecular electron donor-acceptor interactions in the excited state of (anthracene)-(CH2)n-(N,N-dimethylaniline) systems

    T. Okada;T. Fujita;M. Kubota;S. Masaki

  • A Sequential Photoinduced Electron Relay Accelerated by Fullerene in a Porphyrin‐Pyromellitimide‐C60 Triad

    Hiroshi Imahori;Koji Yamada;Masato Hasegawa;Seiji Taniguchi

  • A Stepwise Electron-Transfer Relay Mimicking the Primary Charge Separation in Bacterial Photosynthetic Reaction Center

    Atsuhiro Osuka;Shinji Marumo;Noboru Mataga;Seiji Taniguchi

  • Picosecond laser spectroscopy of intramolecular heteroexcimer systems. Time-resolved absorption studies of p-(CH3)2NC6H4(CH2)n-1-pyrenyl and 9-anthryl systems

    Tadashi Okada;Masahito Migita;Noboru Mataga;Yoshiteru Sakata

  • Dynamics and mechanisms of the multiphoton gated photochromic reaction of diarylethene derivatives.

    Masataka Murakami;Hiroshi Miyasaka;Tadashi Okada;Seiya Kobatake

  • First unequivocal observation of the whole bell-shaped energy gap law in intramolecular charge separation from S(2) excited state of directly linked porphyrin-imide dyads and its solvent-polarity dependencies

    Noboru Mataga;Haik Chosrowjan;Yutaka Shibata;Naoya Yoshida

  • Organic Photoelectrochemical Cell Mimicking Photoinduced Multistep Electron Transfer in Photosynthesis: Interfacial Structure and Photoelectrochemical Properties of Self-Assembled Monolayers of Porphyrin-Linked Fullerenes on Gold Electrodes

    Hiroshi Imahori;Shinichiro Ozawa;Kiminori Ushida;Masao Takahashi

  • Synthesis and Photophysical Property of Porphyrin-Linked Fullerene

    Hiroshi Imahori;Kiyoshi Hagiwara;Tsuyoshi Akiyama;Seiji Taniguchi

  • Picosecond time-resolved absorption spectrum measurements of the higher excited singlet state of diphenylacetylene in the solution phase

    Yoshinori Hirata;Tadashi Okada;Noboru Mataga;Tateo Nomoto

  • Ultrafast charge separation from the S2 excited state of directly linked porphyrin - Imide dyads: First unequivocal observation of the whole bell-shaped energy-gap law and its solvent dependencies

    Noboru Mataga;Haik Chosrowjan;Seiji Taniguchi;Yutaka Shibata

  • Photophysics of the intramolecular exciplex formation in .omega.-(1-pyrenyl)-.alpha.-(dimethylamino)alkanes

    A. M. Swinnen;M. Van der Auweraer;F. C. De Schryver;K. Nakatani

Frequent Co-Authors

Noboru Mataga
Noboru Mataga Osaka University
Yoshiteru Sakata
Yoshiteru Sakata Osaka University
Atsuhiro Osuka
Atsuhiro Osuka Kyoto University
Hiroshi Miyasaka
Hiroshi Miyasaka Osaka University
Hiroshi Imahori
Hiroshi Imahori Kyoto University
Iwao Yamazaki
Iwao Yamazaki Hokkaido University
Fumio Hirata
Fumio Hirata Toyota Motor Corporation (Japan)
Kazuhiro Maruyama
Kazuhiro Maruyama Kyoto University
Tsuyoshi Asahi
Tsuyoshi Asahi Ehime University
Koji Yamada
Koji Yamada National Institute of Advanced Industrial Science and Technology

If you think any of the details on this page are incorrect, let us know.

Report an issue

We appreciate your kind effort to assist us to improve this page, it would be helpful providing us with as much detail as possible in the text box below:

Related Online Degrees & Career Pathways

For students studying Chemistry in the USA, exploring careers that intersect with forensic science can be a rewarding option. Fields such as crime scene analysis, toxicology, and autopsy technology often require a strong foundation in chemistry and biology. If you’re interested in a specialized role, becoming an autopsy technician combines scientific knowledge with practical skills in pathology labs.

Online education offers flexible and affordable pathways to enter forensic science careers. Several well-regarded online colleges for forensic science provide courses that emphasize chemistry’s role in evidence analysis and criminal investigations.

For those interested in the psychological aspects of criminal behavior, an online masters forensic psychology program can deepen your understanding of both science and human behavior.

Overall, a background in chemistry opens diverse opportunities within forensic science. To learn more about the variety of options, check out different careers in forensics and how they apply scientific principles to justice and investigation.

Best Scientists Citing Tadashi Okada

Trending Scientists

Recently Published Articles