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Tsutomu Ishikawa

Tsutomu Ishikawa

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 48 15180 13678 1188 1077 354 8955

Tsutomu Ishikawa publications per year

The chart shows the history of publications by Tsutomu Ishikawa between 1952 and 2023, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Tsutomu Ishikawa published across 72 years, from 1952 to 2023, averaging 5 papers a year. Output peaked at 32 publications in 2004. 4 of the 357 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1952 to 2023. Vertical axis: number of publications, 0 to 32. Peak 32 publications in 2004. 1952: 1 publication 1953: 0 publications 1954: 0 publications 1955: 2 publications 1956: 0 publications 1957: 3 publications 1958: 2 publications 1959: 0 publications 1960: 3 publications 1961: 1 publication 1962: 6 publications 1963: 0 publications 1964: 1 publication 1965: 0 publications 1966: 0 publications 1967: 0 publications 1968: 0 publications 1969: 0 publications 1970: 1 publication 1971: 0 publications 1972: 0 publications 1973: 2 publications 1974: 2 publications 1975: 2 publications 1976: 5 publications 1977: 3 publications 1978: 5 publications 1979: 1 publication 1980: 0 publications 1981: 3 publications 1982: 4 publications 1983: 7 publications 1984: 10 publications 1985: 5 publications 1986: 3 publications 1987: 4 publications 1988: 1 publication 1989: 0 publications 1990: 5 publications 1991: 9 publications 1992: 7 publications 1993: 7 publications 1994: 4 publications 1995: 12 publications 1996: 7 publications 1997: 7 publications 1998: 6 publications 1999: 13 publications 2000: 18 publications 2001: 16 publications 2002: 11 publications 2003: 7 publications 2004: 32 publications 2005: 16 publications 2006: 11 publications 2007: 10 publications 2008: 13 publications 2009: 15 publications 2010: 14 publications 2011: 6 publications 2012: 10 publications 2013: 6 publications 2014: 7 publications 2015: 2 publications 2016: 1 publication 2017: 1 publication 2018: 2 publications 2019: 0 publications 2020: 0 publications 2021: 1 publication 2022: 2 publications 2023: 2 publications
1952 2023

357 publications in total across all disciplines

View publications per year as a table
Tsutomu Ishikawa: publications per year, 1952 to 2023
Year Publications
1952 1
1953 0
1954 0
1955 2
1956 0
1957 3
1958 2
1959 0
1960 3
1961 1
1962 6
1963 0
1964 1
1965 0
1966 0
1967 0
1968 0
1969 0
1970 1
1971 0
1972 0
1973 2
1974 2
1975 2
1976 5
1977 3
1978 5
1979 1
1980 0
1981 3
1982 4
1983 7
1984 10
1985 5
1986 3
1987 4
1988 1
1989 0
1990 5
1991 9
1992 7
1993 7
1994 4
1995 12
1996 7
1997 7
1998 6
1999 13
2000 18
2001 16
2002 11
2003 7
2004 32
2005 16
2006 11
2007 10
2008 13
2009 15
2010 14
2011 6
2012 10
2013 6
2014 7
2015 2
2016 1
2017 1
2018 2
2019 0
2020 0
2021 1
2022 2
2023 2
Total 357
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Tsutomu Ishikawa 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 Tsutomu Ishikawa 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, 341–360 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: 354 publications — 74th percentile

74% 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
341–360 628 354
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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Tsutomu Ishikawa 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 Tsutomu Ishikawa 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, 48–49 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: 48 D-Index — 16th percentile

16% 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 48
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
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

Tsutomu Ishikawa is a researcher affiliated with Chiba University in Japan. Their work spans multiple fields, primarily focusing on Physics and Astronomy as well as Pharmacology, Toxicology, and Pharmaceutics. Within these broader domains, their subfields of study include Nuclear and High Energy Physics, Pharmacology, Plant Science, Analytical Chemistry, and Geriatrics and Gerontology.

Their research interests cover a range of scientific topics, including:

  • Pharmacological Effects of Natural Compounds
  • Phytochemistry and Biological Activity of Medicinal Plants
  • Chromatography in Natural Products
  • Particle Physics Theoretical and Experimental Studies
  • Quantum Chromodynamics and Particle Interactions
  • Black Holes and Theoretical Physics
  • Sirtuins and Resveratrol in Medicine

Tsutomu Ishikawa has contributed to several publications across different scientific venues. Notable recent papers include:

  • "Quercetin 3,5,7,3',4'-pentamethyl ether from Kaempferia parviflora directly and effectively activates human SIRT1" (2021) published in Communications Biology
  • "Is 18α-Glycyrrhizin a real natural product? Improved preparation of 18α-Glycyrrhizin from 18β-Glycyrrhizin as a positive standard for HPLC analysis of licorice extracts" (2022) published in Journal of Natural Medicines
  • "HPLC analysis of ammonium glycyrrhizate listed in the European, United States, and Japanese Pharmacopoeias under reported and modified conditions: revision of the peak assignment for 18α-glycyrrhizin in the European and United States Pharmacopoeias" (2022) published in Journal of Natural Medicines
  • "Spectral sum from Euclidean lattice correlators and determination of renormalization constants" (2021) published in arXiv (Cornell University)

The researcher has frequently collaborated with several coauthors, including Jin Tatsuzaki, Kazuaki Kamata, S. Hashimoto, T. Kaneko, and Mimin Zhang. These partnerships have contributed to an array of publications in journals such as the Journal of Natural Medicines, arXiv (Cornell University), and Communications Biology.

Tsutomu Ishikawa's work bridges theoretical physics and experimental approaches, integrating studies on particle physics and natural compounds' pharmacological properties. Their contributions to chromatography methods in natural products and investigations into sirtuins offer insights relevant for multiple scientific disciplines.

Best Publications

  • Superbases for Organic Synthesis

    Tsutomu Ishikawa

  • Guanidines in organic synthesis

    Tsutomu Ishikawa;Takuya Kumamoto

  • Modified guanidines as chiral auxiliaries.

    Tsutomu Ishikawa;Toshio Isobe

  • Benzo[c]phenanthridine bases and their antituberculosis activity.

    Tsutomu Ishikawa

  • 2-Chloro-1,3-dimethylimidazolinium Chloride. 1. A Powerful Dehydrating Equivalent to DCC

    Toshio Isobe;Tsutomu Ishikawa

  • Modified guanidines as chiral superbases: the first example of asymmetric silylation of secondary alcohols

    Toshio Isobe;Keiko Fukuda;Yukari Araki;Tsutomu Ishikawa

  • Superbases for Organic Synthesis: Guanidines, Amidines, Phosphazenes and Related Organocatalysts

    Tsutomu Ishikawa

  • Modified Guanidines as Chiral Superbases: Application to Asymmetric Michael Reaction of Glycine Imine with Acrylate or Its Related Compounds.

    Tsutomu Ishikawa;Yukari Araki;Takuya Kumamoto;Hiroko Seki

  • Isoflavonoids from Pueraria mirifica and their Estrogenic Activity

    Sunee Chansakaow;Tsutomu Ishikawa;Keiko Sekine;Mineaki Okada

  • New cytotoxic cyclobutanoid amides, a new furanoid lignan and anti-platelet aggregation constituents from Piper arborescens.

    Ian Lih Tsai;Fan Pin Lee;Chin Chung Wu;Chang Yih Duh

  • Concise synthesis of anti-HIV-1 active (+)-inophyllum B and (+)-calanolide a by application of (-).Quinine-catalyzed intramolecular oxo-michael addition

    Etsuko Sekino;Takuya Kumamoto;Tomohiro Tanaka;Tomoko Ikeda

  • 2-Chloro-1,3-dimethylimidazolinium Chloride. 2. Its Application to the Construction of Heterocycles through Dehydration Reactions

    Toshio Isobe;Tsutomu Ishikawa

  • A new sesquiterpene and other terpenoid constituents of Chisocheton penduliflorus.

    Jarinporn Phongmaykin;Takuya Kumamoto;Tsutomu Ishikawa;Rutt Suttisri

  • Anti-platelet aggregation constituents from formosan Toddalia asiatica

    Ian-Lih Tsai;Ming-Fong Wun;Che-Ming Teng;Tsutomu Ishikawa

  • Inhibitory effect of oxycoumarins isolated from the Thai medicinal plant Clausena guillauminii on the inflammation mediators, iNOS, TNF-α, and COX-2 expression in mouse macrophage RAW 264.7

    Tomonori Nakamura;Naoko Kodama;Yu Arai;Takuya Kumamoto

  • Studies on the Chemical Constituents of Stem Bark of Millettia leucantha: Isolation of New Chalcones with Cytotoxic, Anti-herpes Simplex Virus and Anti-inflammatory Activities

    Ampai Phrutivorapongkul;Vimolmas Lipipun;Nijsiri Ruangrungsi;Kanyawim Kirtikara

  • Coumarins and antiplatelet constituents from the root bark of Zanthoxylum schinifolium

    Ian-Lih Tsai;Wei-Yu Lin;Che-Ming Teng;Tsutomu Ishikawa

  • Anti-platelet aggregation and chemical constituents from the rhizome of Gynura japonica.

    Wei-Yu Lin;Yueh-Hsiung Kuo;Ya-Ling Chang;Che-Ming Teng

  • Modified guanidines as potential chiral superbases. 1. Preparation Of 1,3-disubstituted 2-iminoimidazolidines and the related guanidines through chloroamidine derivatives

    Toshio Isobe;Keiko Fukuda;Tsutomu Ishikawa

  • An approach to anti-HIV-1 active Calophyllum coumarin synthesis: An enantioselective construction of 2,3-dimethyl-4-chromanone ring by quinine-assisted intramolecular Michael-type addition

    Tsutomu Ishikawa;Yumie Oku;Tomohiro Tanaka;Takuya Kumamoto

  • Guanidine chemistry.

    Unknown

Frequent Co-Authors

Ih-Sheng Chen
Ih-Sheng Chen Kaohsiung Medical University
Kentaro Yamaguchi
Kentaro Yamaguchi Tokushima Bunri University
Noriyuki Suzuki
Noriyuki Suzuki National Institute for Environmental Studies
Jun'ichi Kobayashi
Jun'ichi Kobayashi Hokkaido University
Masato Asanuma
Masato Asanuma Okayama University
Kazuei Igarashi
Kazuei Igarashi Chiba University
Kazuo Furihata
Kazuo Furihata University of Tokyo
Yuzuru Mikami
Yuzuru Mikami Chiba University
Yoshihiko Funae
Yoshihiko Funae Osaka Metropolitan University
Che-Ming Teng
Che-Ming Teng National Taiwan University

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