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Gen-ichiro Nonaka

Gen-ichiro Nonaka

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 72 5416 4921 330 308 245 13402

Gen-ichiro Nonaka publications per year

The chart shows the history of publications by Gen-ichiro Nonaka between 1973 and 2023, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Gen-ichiro Nonaka published across 51 years, from 1973 to 2023, averaging 5.1 papers a year. Output peaked at 23 publications in 1989. 1 of the 258 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1973 to 2023. Vertical axis: number of publications, 0 to 23. Peak 23 publications in 1989. 1973: 4 publications 1974: 2 publications 1975: 2 publications 1976: 1 publication 1977: 5 publications 1978: 0 publications 1979: 1 publication 1980: 5 publications 1981: 3 publications 1982: 9 publications 1983: 10 publications 1984: 11 publications 1985: 17 publications 1986: 18 publications 1987: 15 publications 1988: 19 publications 1989: 23 publications 1990: 20 publications 1991: 11 publications 1992: 18 publications 1993: 12 publications 1994: 3 publications 1995: 7 publications 1996: 5 publications 1997: 4 publications 1998: 2 publications 1999: 2 publications 2000: 0 publications 2001: 4 publications 2002: 3 publications 2003: 1 publication 2004: 1 publication 2005: 0 publications 2006: 3 publications 2007: 4 publications 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 3 publications 2012: 4 publications 2013: 2 publications 2014: 1 publication 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 0 publications 2019: 0 publications 2020: 1 publication 2021: 1 publication 2022: 0 publications 2023: 1 publication
1973 2023

258 publications in total across all disciplines

View publications per year as a table
Gen-ichiro Nonaka: publications per year, 1973 to 2023
Year Publications
1973 4
1974 2
1975 2
1976 1
1977 5
1978 0
1979 1
1980 5
1981 3
1982 9
1983 10
1984 11
1985 17
1986 18
1987 15
1988 19
1989 23
1990 20
1991 11
1992 18
1993 12
1994 3
1995 7
1996 5
1997 4
1998 2
1999 2
2000 0
2001 4
2002 3
2003 1
2004 1
2005 0
2006 3
2007 4
2008 0
2009 0
2010 0
2011 3
2012 4
2013 2
2014 1
2015 0
2016 0
2017 0
2018 0
2019 0
2020 1
2021 1
2022 0
2023 1
Total 258
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Gen-ichiro Nonaka 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 Gen-ichiro Nonaka sits on this spectrum.

No. of scientists
250 500 750 1,000 1,250
Bar chart with 63 bars. Horizontal axis: publications, 61–80 to 1,295+. Vertical axis: number of scientists, 0 to 1,350. Most scientists, 1,350, have 161–180 publications. The last bar groups every scientist with 1,295 publications or more. The highlighted bar, 241–260 publications, is where this scientist sits. 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
61–80 publications 1,295+

This scientist: 245 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.

View publications distribution as a table
Number of Chemistry scientists by publication count, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
Publications Scientists This scientist
61–80 66
81–100 302
101–120 623
121–140 918
141–160 1,218
161–180 1,350
181–200 1,344
201–220 1,281
221–240 1,216
241–260 1,100 245
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397
421–440 327
441–460 270
461–480 265
481–500 252
501–520 201
521–540 185
541–560 148
561–580 148
581–600 132
601–620 114
621–640 104
641–660 91
661–680 92
681–700 73
701–720 57
721–740 54
741–760 67
761–780 45
781–800 46
801–820 39
821–840 32
841–860 36
861–880 29
881–900 26
901–920 24
921–940 14
941–960 23
961–980 28
981–1,000 15
1,001–1,020 29
1,021–1,040 12
1,041–1,060 19
1,061–1,080 12
1,081–1,100 6
1,101–1,120 8
1,121–1,140 12
1,141–1,160 5
1,161–1,180 6
1,181–1,200 14
1,201–1,220 7
1,221–1,240 2
1,241–1,260 6
1,261–1,280 4
1,281–1,294 6
1,295+ 100
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Gen-ichiro Nonaka 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 Gen-ichiro Nonaka sits on this spectrum.

No. of scientists
250 500 750 1,000
Bar chart with 61 bars. Horizontal axis: D-Index, 40–41 to 159+. Vertical axis: number of scientists, 0 to 1,051. Most scientists, 1,051, have 56–57 D-Index. The last bar groups every scientist with 159 D-Index or more. The highlighted bar, 72–73 D-Index, is where this scientist sits. 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
40–41 D-Index 159+

This scientist: 72 D-Index — 71st percentile

71% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Chemistry scientists by D-index, Research.com 2026 ranking edition. Based on 17,934 ranked scientists.
D-Index Scientists This scientist
40–41 289
42–43 612
44–45 808
46–47 776
48–49 835
50–51 861
52–53 872
54–55 933
56–57 1,051
58–59 930
60–61 882
62–63 834
64–65 731
66–67 775
68–69 683
70–71 646
72–73 561 72
74–75 501
76–77 437
78–79 388
80–81 354
82–83 292
84–85 275
86–87 254
88–89 235
90–91 185
92–93 192
94–95 155
96–97 163
98–99 125
100–101 105
102–103 105
104–105 112
106–107 88
108–109 68
110–111 69
112–113 65
114–115 79
116–117 61
118–119 44
120–121 37
122–123 40
124–125 33
126–127 26
128–129 34
130–131 35
132–133 25
134–135 27
136–137 17
138–139 16
140–141 20
142–143 20
144–145 15
146–147 9
148–149 9
150–151 16
152–153 11
154–155 9
156–157 3
158 3
159+ 98
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Overview

Gen-ichiro Nonaka is affiliated with Kyushu University in Japan and has contributed to several research fields including biochemistry, genetics, molecular biology, and medicine. Their work spans across specialized subfields such as molecular biology, biochemistry, applied microbiology and biotechnology, organic chemistry, and toxicology.

The scientist's research focuses primarily on phytochemicals and antioxidant activities, with notable investigations into plant biochemistry and biosynthesis as well as plant gene expression analysis. Additional topics frequently addressed in their publications include tannin, tannase, and anticancer activities, free radicals and antioxidants, and bioactive compounds with antitumor properties.

Their recent published papers include:

  • Highly Oxidized Ellagitannins of Carpinus japonica and Their Oxidation-Reduction Disproportionation, 2020, Journal of Natural Products
  • Ellagitannins and Oligomeric Proanthocyanidins of Three Polygonaceous Plants, 2021, Molecules
  • Yellow pigments produced by oxidative oligomerization of dihydrochalcone glucoside and the reaction mechanism, 2023, Food Chemistry

Frequent coauthors in their research collaborations include Yosuke Matsuo, Yoshinori Saito, Takashi Tanaka, Yong-Lin Huang, and Dianpeng Li.

The scientist's publications have appeared in various research venues, including the Journal of Natural Products, Molecules, and Food Chemistry.

Best Publications

  • Study on the Inhibitory Effect of Tannins and Flavonoids against the 1,1-Diphenyl-2-picrylhydrazyl Radical

    Takako Yokozawa;Cui Ping Chen;Erbo Dong;Takashi Tanaka

  • Tannins and related compounds. XV. A new class of dimeric flavan-3-ol gallates, theasinensins A and B, and proanthocyanidin gallates from green tea leaf (1)

    Genichiro Nonaka;Osamu Kawahara;Itsuo Nishioka

  • Antitumor Agents, 129. Tannins and Related Compounds as Selective Cytotoxic Agents

    Yoshiki Kashiwada;Gen Ichiro Nonaka;Itsuo Nishioka;Jer Jang Chang

  • Structure and antiherpetic activity among the Tannins

    Masayuki Takechi;Yasuo Tanaka;Manabu Takehara;Gen-Ichiro Nonaka

  • Tannins and Related Compounds. XC. : 8-C-Ascorbyl (-)-Epigallocatechin 3-O-Gallate and Novel Dimeric Flavan -3-ols, Oolonghomobisflavans A and B, from Oolong Tea. (3)

    Fumio Hashimoto;Gen-ichiro Nonaka;Itsuo Nishioka

  • Chemical evidence for the de-astringency (insolubilization of tannins) of persimmon fruit

    Takashi Tanaka;Ryuji Takahashi;Isao Kouno;Gen-ichiro Nonaka

  • Tannins and Related Compounds. I. Rhubarb (1)

    Genichiro Nonaka;Itsuo Nishioka;Tetsuro Nagasawa;Hikokichi Oura

  • Anti-AIDS Agents, 18. Sodium and Potassium Salts of Caffeic Acid Tetramers from Arnebia euchroma as Anti-HIV Agents

    Y. Kashiwada;M. Nishizawa;T. Yamagishi;T. Tanaka

  • Tannins and Related Compounds. LXIX. : Isolation and Structure Elucidation of B, B'-Linked Bisflavanoids, Theasinensins D-G and Oolongtheanin from Oolong Tea. (2)

    Fumio Hashimoto;Gen-Ichiro Nonaka;Itsuo Nishioka

  • Tannins and related compounds. XL: Revision of the structures of punicalin and punicalagin, and isolation and characterization of 2-O-galloylpunicalin from the bark of Punica granatum L.

    Takashi Tanaka;Gen-Ichiro Nonaka;Itsuo Nishioka

  • Magnesium and Ammonium-Potassium Lithospermates B, the Active Principles Having a Uremia-Preventive Effect from Salvia miltiorrhiza

    Takashi Tanaka;Satoshi Morimoto;Gen-ichiro Nonaka;Itsuo Nishioka

  • Tannins as Potent Inhibitors of DNA Topoisomerase II In Vitro

    Yoshiki Kashiwada;Gen-Ichiro Nonaka;Itsuo Nishioka;Kenneth Jiann-Hung Lee;Kenneth Jiann-Hung Lee

  • Hydrolysable tannins and proanthocyanidins from green tea

    Gen-Ichiro Nonaka;Ryo Sakai;Itsuo Nishioka

  • Punicafolin, an ellagitannin from the leaves of Punica granatum

    Takashi Tanaka;Gen-Ichiro Nonaka;Itsuo Nishioka

  • Tannins and Related Compounds. XXXVIII. : Isolation and Characterization of Flavan-3-ol Glucosides and Procyanidin Oligomers from Cassia Bark : Cinnamomum cassia BLUME

    Satoshi Morimoto;Gen-Ichiro Nonaka;Itsuo Nishioka

  • Tannins and Related Compounds. XLII. : Isolation and Characterization of Four New Hydrolyzable Tannins, Terflavins A and B, Tergallagin and Tercatain from the Leaves of Terminalia catappa L.

    Takashi Tanaka;Gen-Ichiro Nonaka;Itsuo Nishioka

  • Tannins and related compounds. Part 5. Isolation and characterization of polygalloylglucoses from Chinese gallotannin

    Makoto Nishizawa;Takashi Yamagishi;Gen-ichiro Nonaka;Itsuo Nishioka

  • Myricatin, a galloyl flavanonol sulfate and prodelphinidin gallates from Myrica rubra

    Gen-Ichiro Nonaka;Makiko Muta;Itsuo Nishioka

  • Tannins and Related Compounds. CXIV. Structure of Novel Fermentation Products, Theogallinin, Theaflavonin and Desgalloyl Theaflavonin from Black Tea, and Changes of Tea Leaf Polyphenols during Fermentation

    Fumio Hashimoto;Gen-ichiro Nonaka;Itsuo Nishioka

  • Tannins and Related Compounds. XLI. : Isolation and Characterization of Novel Ellagitannins, Punicacorteins A, B, C, and D, and Punigluconin from the Bark of Punica granatum L.

    Takashi Tanaka;Gen-Ichiro Nonaka;Itsuo Nishioka

  • Evaluation of the Anti-oxidative Effect (in vitro) of Tea Polyphenols

    Fumio Hashimoto;Masateru Ono;Chikako Masuoka;Yasuyuki Ito

Frequent Co-Authors

Itsuo Nishioka
Itsuo Nishioka Kyushu University
Takashi Tanaka
Takashi Tanaka Nagasaki University
Takako Yokozawa
Takako Yokozawa University of Toyama
Satoshi Morimoto
Satoshi Morimoto Kyushu University
Isao Kouno
Isao Kouno Nagasaki University
Yoshiki Kashiwada
Yoshiki Kashiwada University of Tokushima
Kuo Hsiung Lee
Kuo Hsiung Lee University of Minnesota
Hae Young Chung
Hae Young Chung Pusan National University
Junei Kinjo
Junei Kinjo Fukuoka University
Masami Niwa
Masami Niwa Nagasaki University

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