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Chemistry
Japan
2026

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 97 1462 1298 67 64 416 35235

Etsuo Niki publications per year

The chart shows the history of publications by Etsuo Niki between 1966 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Etsuo Niki published across 60 years, from 1966 to 2025, averaging 7.5 papers a year. Output peaked at 20 publications in 1997. 2 of the 448 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1966 to 2025. Vertical axis: number of publications, 0 to 20. Peak 20 publications in 1997. 1966: 1 publication 1967: 2 publications 1968: 3 publications 1969: 6 publications 1970: 1 publication 1971: 1 publication 1972: 1 publication 1973: 1 publication 1974: 2 publications 1975: 5 publications 1976: 1 publication 1977: 6 publications 1978: 6 publications 1979: 2 publications 1980: 2 publications 1981: 2 publications 1982: 5 publications 1983: 4 publications 1984: 8 publications 1985: 9 publications 1986: 10 publications 1987: 6 publications 1988: 7 publications 1989: 11 publications 1990: 14 publications 1991: 9 publications 1992: 17 publications 1993: 11 publications 1994: 10 publications 1995: 10 publications 1996: 7 publications 1997: 20 publications 1998: 11 publications 1999: 15 publications 2000: 15 publications 2001: 12 publications 2002: 14 publications 2003: 8 publications 2004: 17 publications 2005: 13 publications 2006: 12 publications 2007: 17 publications 2008: 19 publications 2009: 10 publications 2010: 20 publications 2011: 8 publications 2012: 11 publications 2013: 6 publications 2014: 5 publications 2015: 5 publications 2016: 5 publications 2017: 3 publications 2018: 1 publication 2019: 6 publications 2020: 2 publications 2021: 5 publications 2022: 3 publications 2023: 3 publications 2024: 1 publication 2025: 1 publication
1966 2025

448 publications in total across all disciplines

View publications per year as a table
Etsuo Niki: publications per year, 1966 to 2025
Year Publications
1966 1
1967 2
1968 3
1969 6
1970 1
1971 1
1972 1
1973 1
1974 2
1975 5
1976 1
1977 6
1978 6
1979 2
1980 2
1981 2
1982 5
1983 4
1984 8
1985 9
1986 10
1987 6
1988 7
1989 11
1990 14
1991 9
1992 17
1993 11
1994 10
1995 10
1996 7
1997 20
1998 11
1999 15
2000 15
2001 12
2002 14
2003 8
2004 17
2005 13
2006 12
2007 17
2008 19
2009 10
2010 20
2011 8
2012 11
2013 6
2014 5
2015 5
2016 5
2017 3
2018 1
2019 6
2020 2
2021 5
2022 3
2023 3
2024 1
2025 1
Total 448
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Etsuo Niki 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 Etsuo Niki 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, 401–420 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: 416 publications — 82nd percentile

82% 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
261–280 979
281–300 939
301–320 764
321–340 643
341–360 628
361–380 522
381–400 459
401–420 397 416
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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Etsuo Niki 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 Etsuo Niki 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, 96–97 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: 97 D-Index — 92nd percentile

92% 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
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 97
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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Research.com Recognitions

  • 2026 - Research.com Chemistry in Japan Leader Award
  • 2025 - Research.com Chemistry in Japan Leader Award
  • 2022 - Research.com Chemistry in Japan Leader Award

Overview

Etsuo Niki is affiliated with the University of Tokyo in Japan and conducts research predominantly in the intersecting fields of Medicine, Chemistry, and Biochemistry, Genetics and Molecular Biology. Their work focuses primarily on areas such as Free Radicals and Antioxidants, Antioxidant Activity and Oxidative Stress, and Vitamin C and Antioxidants Research, with additional contributions to Sulfur Compounds in Biology, Redox Biology and Oxidative Stress, Cholesterol and Lipid Metabolism, and Phytochemicals and Antioxidant Activities.

The primary publication venues for this scientist include Free Radical Biology and Medicine, Free Radical Research, Antioxidants and Redox Signaling, Biochemical and Biophysical Research Communications, and Journal of Berry Research. These journals reflect a concentration in biochemical and oxidative stress research.

Among recent scholarly publications are:

  • Lipid oxidation that is, and is not, inhibited by vitamin E: Consideration about physiological functions of vitamin E, 2021, Free Radical Biology and Medicine
  • Antioxidant action of vitamin Ein vivo as assessed from its reaction products with multiple biological oxidants, 2020, Free Radical Research
  • Actions of Thiols, Persulfides, and Polysulfides as Free Radical Scavenging Antioxidants, 2023, Antioxidants and Redox Signaling
  • Antioxidant action of persulfides and polysulfides against free radical-mediated lipid peroxidation, 2022, Free Radical Research
  • Cholesterol is more readily oxidized than phospholipid linoleates in cell membranes to produce cholesterol hydroperoxides, 2023, Free Radical Biology and Medicine

Frequent collaborators in research include Noriko Noguchi, Yoshiro Saito, Takayuki Kaneko, Yuichiro Mita, and Kanako Nozawa-Kumada. This network suggests a collaborative approach in biochemical and antioxidant research.

Their work demonstrates an emphasis on biochemical mechanisms behind antioxidant activity, particularly the behavior of vitamin E and sulfur-containing compounds in oxidative stress. Research output further addresses lipid metabolism and the complex biochemical interactions of free radicals within biological systems, as indicated by the topics and the specificity of publications.

Best Publications

  • Lipid peroxidation: mechanisms, inhibition, and biological effects.

    Etsuo Niki;Yasukazu Yoshida;Yoshiro Saito;Noriko Noguchi

  • Lipid peroxidation: physiological levels and dual biological effects.

    Unknown

  • Antioxidants in relation to lipid peroxidation

    Etsuo Niki

  • Assessment of antioxidant capacity in vitro and in vivo.

    Unknown

  • Protein-bound acrolein: Potential markers for oxidative stress

    Koji Uchida;Masamichi Kanematsu;Kensuke Sakai;Tsukasa Matsuda

  • Free radical initiators as source of water- or lipid-soluble peroxyl radicals.

    Etsuo Niki

  • Inhibition of oxidation of methyl linoleate in solution by vitamin E and vitamin C.

    E Niki;T Saito;A Kawakami;Y Kamiya

  • Acrolein Is a Product of Lipid Peroxidation Reaction: FORMATION OF FREE ACROLEIN AND ITS CONJUGATE WITH LYSINE RESIDUES IN OXIDIZED LOW DENSITY LIPOPROTEINS *

    Koji Uchida;Masamichi Kanematsu;Yasujiro Morimitsu;Toshihiko Osawa

  • Role of vitamin E as a lipid-soluble peroxyl radical scavenger: in vitro and in vivo evidence.

    Unknown

  • Action of ascorbic acid as a scavenger of active and stable oxygen radicals.

    Etsuo Niki

  • Interaction among vitamin C, vitamin E, and beta-carotene.

    Etsuo Niki;Noriko Noguchi;Hidevasu Tsuchihashi;Naohiro Gotoh

  • Interaction of ascorbate and alpha-tocopherol.

    Etsuo Niki

  • Free-radical chain oxidation of rat red blood cells by molecular oxygen and its inhibition by α-tocopherol

    Masayuki Miki;Hiroshi Tamai;Makoto Mino;Yorihiro Yamamoto

  • Free radical-mediated chain oxidation of low density lipoprotein and its synergistic inhibition by vitamin E and vitamin C.

    Keizo Sato;Etsuo Niki;Hiroyuki Shimasaki

  • Comparative study on the action of tocopherols and tocotrienols as antioxidant: chemical and physical effects.

    Yasukazu Yoshida;Etsuo Niki;Noriko Noguchi

  • A comparison of screening methods for antioxidant activity in seaweeds

    R. Matsukawa;Z. Dubinsky;E. Kishimoto;K. Masaki

  • REGENERATION OF VITAMIN E FROM α-CHROMANOXYL RADICAL BY GLUTATHIONE AND VITAMIN C

    Etsuo Niki;Jyunichi Tsuchiya;Ritsuko Tanimura;Yoshio Kamiya

  • Antioxidant effects of phytosterol and its components.

    Yasukazu Yoshida;Etsuo Niki

  • Dynamics of antioxidant action of vitamin E.

    Etsijo Niki;Noriko Noguchi

  • Protein Adsorption of Ultrafine Metal Oxide and Its Influence on Cytotoxicity toward Cultured Cells

    Masanori Horie;Keiko Nishio;Katsuhide Fujita;Shigehisa Endoh

  • Oxidative hemolysis of erythrocytes and its inhibition by free radical scavengers.

    E Niki;E Komuro;M Takahashi;S Urano

  • Cell death caused by selenium deficiency and protective effect of antioxidants

    Yoshiro Saito;Yasukazu Yoshida;Takashi Akazawa;Kazuhiko Takahashi

  • A novel fluorescent probe diphenyl‐1‐pyrenylphosphine to follow lipid peroxidation in cell membranes

    Yuko Okimoto;Akira Watanabe;Etsuo Niki;Takashi Yamashita

Frequent Co-Authors

Noriko Noguchi
Noriko Noguchi Doshisha University
Yasukazu Yoshida
Yasukazu Yoshida National Institute of Advanced Industrial Science and Technology
Tatsuhiko Kodama
Tatsuhiko Kodama University of Tokyo
Hitoshi Iwahashi
Hitoshi Iwahashi Gifu University
Koji Uchida
Koji Uchida University of Tokyo
Xian-Yong Wei
Xian-Yong Wei China University of Mining and Technology
Takao Hamakubo
Takao Hamakubo Nippon Medical School
Motohiro Takeya
Motohiro Takeya Kumamoto Health Science University
Akira Watanabe
Akira Watanabe Kyoto University
Yoshiro Saito
Yoshiro Saito Tohoku University

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