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Tomihisa Ohta

Tomihisa Ohta

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 46 16132 14557 1275 1157 195 6983

Tomihisa Ohta publications per year

The chart shows the history of publications by Tomihisa Ohta between 1970 and 2023, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Tomihisa Ohta published across 54 years, from 1970 to 2023, averaging 4 papers a year. Output peaked at 10 publications in 2002. 1 of the 214 publications appeared in the last two years.

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

214 publications in total across all disciplines

View publications per year as a table
Tomihisa Ohta: publications per year, 1970 to 2023
Year Publications
1970 2
1971 5
1972 3
1973 0
1974 0
1975 1
1976 2
1977 1
1978 1
1979 2
1980 1
1981 2
1982 0
1983 2
1984 1
1985 0
1986 3
1987 3
1988 8
1989 9
1990 8
1991 4
1992 9
1993 6
1994 4
1995 4
1996 4
1997 4
1998 5
1999 7
2000 9
2001 3
2002 10
2003 6
2004 6
2005 9
2006 4
2007 9
2008 7
2009 9
2010 3
2011 7
2012 8
2013 6
2014 2
2015 3
2016 5
2017 2
2018 2
2019 0
2020 1
2021 1
2022 0
2023 1
Total 214
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Tomihisa Ohta 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 Tomihisa Ohta 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, 181–200 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: 195 publications — 31st percentile

31% 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 1,344 195
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
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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Tomihisa Ohta 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 Tomihisa Ohta 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, 46–47 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: 46 D-Index — 12th percentile

12% 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 46
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
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

Tomihisa Ohta is affiliated with Kanazawa University in Japan. Their research primarily spans the fields of Agricultural and Biological Sciences, Biochemistry, Genetics and Molecular Biology, and Medicine. Within these fields, their work further delves into subfields including Complementary and Alternative Medicine, Food Science, Molecular Biology, Plant Science, and Biotechnology.

Their scientific contributions have been published in several venues, notably Natural Product Research, Saudi Pharmaceutical Journal, and the Japanese Journal of Complementary and Alternative Medicine.

Recent publications by Tomihisa Ohta include:

  • Phytochemical and in silico studies for potential constituents from Centaurium spicatum as candidates against the SARS-CoV-2 main protease and RNA-dependent RNA polymerase, 2021, Natural Product Research
  • Isolation and identification of novel selective antitumor constituents, sidrin and sidroside, from Zizyphus spina-christi, 2023, Saudi Pharmaceutical Journal
  • Anti-tumor Activity and Survival Impact of Whole Adlay Hot Water Extract in Sarcoma Mouse Model, 2020, Japanese Journal of Complementary and Alternative Medicine

The scientist's research covers main topics such as Medicinal Plants and Neuroprotection, Phytochemistry and Biological Activities, Essential Oils and Antimicrobial Activity, Ziziphus Jujuba Studies and Applications, Natural product bioactivities and synthesis, Ginseng Biological Effects and Applications, and Microbial Metabolism and Applications.

Tomihisa Ohta has frequently collaborated with researchers including Ahmed E. Allam, Mohamed E. Abouelela, Hamdy K. Assaf, Ahmed M. Sayed, and Alaa M. Nafady.

Best Publications

  • Role of Furanocoumarin Derivatives on Grapefruit Juice-Mediated Inhibition of Human CYP3A Activity

    Lian-Qing Guo;Katsuyuki Fukuda;Tomihisa Ohta;Yasushi Yamazoe

  • Notoamides A–D: Prenylated Indole Alkaloids Isolated from a Marine‐Derived Fungus, Aspergillus sp.

    Hikaru Kato;Takushi Yoshida;Takanori Tokue;Yuka Nojiri

  • Inhibition Selectivity of Grapefruit Juice Components on Human Cytochromes P450

    Wichittra Tassaneeyakul;Lian-Qing Guo;Katsuyuki Fukuda;Tomihisa Ohta

  • Specific CYP3A4 inhibitors in grapefruit juice: furocoumarin dimers as components of drug interaction

    Katsuyuki Fukuda;Tomihisa Ohta;Yoshiteru Oshima;Noriko Ohashi

  • Ascididemin, a novel pentacyclic aromatic alkaloid with potent antileukemic activity from the Okinawan tunicate Didemnum sp.

    Jun'ichi Kobayash;Jie-fei Cheng;Hideshi Nakamura;Yasushi Ohizumi

  • Eudistomidins B, C, and D: novel antileukemic alkaloids from the Okinawan marine tunicate Eudistoma glaucus

    Junichi Kobayashi;Jie Fei Cheng;Tomihisa Ohta;Shigeo Nozoe

  • Isolation of antipodal (-)-versicolamide B and notoamides L-N from a marine-derived Aspergillus sp

    Sachiko Tsukamoto;Tetsuro Kawabata;Hikaru Kato;Thomas J. Greshock

  • Notoamides F-K, prenylated indole alkaloids isolated from a marine-derived Aspergillus sp.

    Sachiko Tsukamoto;Hikaru Kato;Masayuki Samizo;Yuka Nojiri

  • Ageliferins, potent actomyosin Atpase activators from the Okinawan marine sponge sp

    Jun'ichi Kobayashi;Masashi Tsuda;Tetsuya Murayama;Hideshi Nakamura

  • Bioactive monoterpene glycosides conjugated with gallic acid from the leaves of Eucalyptus globulus.

    Tatsuya Hasegawa;Fumihide Takano;Takanobu Takata;Masato Niiyama

  • Himeic acid A: a new ubiquitin-activating enzyme inhibitor isolated from a marine-derived fungus, Aspergillus sp.

    Sachiko Tsukamoto;Hiroshi Hirota;Misako Imachi;Masahiro Fujimuro

  • Hyrtiosins A and B, new indole alkaloids from the Okinawan marine sponge Hyrtios erecta

    Jun'ichi Kobayashi;Tetsuya Murayama;Tetsuya Murayama;Masami Ishibashi;Sumiko Kosuge;Sumiko Kosuge

  • Inhibitory effect of natural furanocoumarins on human microsomal cytochrome P450 3A activity.

    Lian-Qing Guo;Masahiko Taniguchi;Yong-Qing Xiao;Kimiye Baba

  • Four new bioactive pyrrole-derived alkaloids from the marine sponge Axinella brevistyla.

    Sachiko Tsukamoto;Kazuhiro Tane;Tomihisa Ohta;Shigeki Matsunaga

  • Isolation of cytochrome p450 inhibitors from strawberry fruit, Fragaria ananassa

    Sachiko Tsukamoto;Kyoko Tomise;Maki Aburatani;Hiroyuki Onuki

  • Hexylitaconic acid: a new inhibitor of p53-HDM2 interaction isolated from a marine-derived fungus, Arthrinium sp.

    Sachiko Tsukamoto;Takushi Yoshida;Hidetaka Hosono;Tomihisa Ohta

  • Anti-inflammatory and anti-melanogenic steroidal saponin glycosides from Fenugreek (Trigonella foenum-graecum L.) seeds.

    Tetsuro Kawabata;Ming Yue Cui;Tatsuya Hasegawa;Fumihide Takano

  • Isolation of notoamide E, a key precursor in the biosynthesis of prenylated indole alkaloids in a marine-derived fungus, Aspergillus sp

    Sachiko Tsukamoto;Hikaru Kato;Thomas J. Greshock;Hiroshi Hirota

  • Stimulation of neurotrophic factor secretion from 1321N1 human astrocytoma cells by novel diterpenoids, scabronines A and G

    Yutaro Obara;Norimichi Nakahata;Takako Kita;Yoshiaki Takaya

  • Scabronine A, a novel diterpenoid having potent inductive activity of the nerve growth factor synthesis, isolated from the mushroom, Sarcodon scabrosus

    Tomihisa Ohta;Takako Kita;Norihiro Kobayashi;Yutaro Obara

  • Iejimalides A and B, novel 24-membered macrolides with potent antileukemic activity from the Okinawan tunicate Eudistoma cf. rigida

    Junichi Kobayashi;Jiefei Cheng;Tomihisa Ohta;Hideshi Nakamura

Frequent Co-Authors

Sachiko Tsukamoto
Sachiko Tsukamoto Kumamoto University
Yasushi Ohizumi
Yasushi Ohizumi Tohoku University
Yoshiteru Oshima
Yoshiteru Oshima Tohoku University
Ichiro Takahashi
Ichiro Takahashi Hiroshima University
Masami Ishibashi
Masami Ishibashi Chiba University
Yasushi Yamazoe
Yasushi Yamazoe Tohoku University
Hiroshi Hikino
Hiroshi Hikino Tohoku University
Hiroshi Hirota
Hiroshi Hirota Nihon University
Jun'ichi Kobayashi
Jun'ichi Kobayashi Hokkaido University
Robert M. Williams
Robert M. Williams Colorado State University

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