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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 51 14166 12755 32 30 207 7407

Toh-Seok Kam publications per year

The chart shows the history of publications by Toh-Seok Kam between 1975 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Toh-Seok Kam published across 51 years, from 1975 to 2025, averaging 4.3 papers a year. Output peaked at 16 publications in 1998. 5 of the 218 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1975 to 2025. Vertical axis: number of publications, 0 to 16. Peak 16 publications in 1998. 1975: 1 publication 1976: 0 publications 1977: 0 publications 1978: 1 publication 1979: 0 publications 1980: 0 publications 1981: 1 publication 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 0 publications 1988: 0 publications 1989: 1 publication 1990: 1 publication 1991: 1 publication 1992: 4 publications 1993: 6 publications 1994: 3 publications 1995: 6 publications 1996: 12 publications 1997: 8 publications 1998: 16 publications 1999: 14 publications 2000: 2 publications 2001: 4 publications 2002: 3 publications 2003: 8 publications 2004: 14 publications 2005: 0 publications 2006: 5 publications 2007: 8 publications 2008: 10 publications 2009: 10 publications 2010: 7 publications 2011: 4 publications 2012: 3 publications 2013: 5 publications 2014: 9 publications 2015: 6 publications 2016: 7 publications 2017: 5 publications 2018: 4 publications 2019: 6 publications 2020: 4 publications 2021: 4 publications 2022: 4 publications 2023: 6 publications 2024: 2 publications 2025: 3 publications
1975 2025

218 publications in total across all disciplines

View publications per year as a table
Toh-Seok Kam: publications per year, 1975 to 2025
Year Publications
1975 1
1976 0
1977 0
1978 1
1979 0
1980 0
1981 1
1982 0
1983 0
1984 0
1985 0
1986 0
1987 0
1988 0
1989 1
1990 1
1991 1
1992 4
1993 6
1994 3
1995 6
1996 12
1997 8
1998 16
1999 14
2000 2
2001 4
2002 3
2003 8
2004 14
2005 0
2006 5
2007 8
2008 10
2009 10
2010 7
2011 4
2012 3
2013 5
2014 9
2015 6
2016 7
2017 5
2018 4
2019 6
2020 4
2021 4
2022 4
2023 6
2024 2
2025 3
Total 218
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Toh-Seok Kam 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 Toh-Seok Kam 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, 201–220 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: 207 publications — 35th percentile

35% 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 1,281 207
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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Toh-Seok Kam 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 Toh-Seok Kam 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, 50–51 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: 51 D-Index — 23rd percentile

23% 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 51
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

Toh-Seok Kam is a researcher affiliated with the University of Malaya in Malaysia. Their work spans multiple scientific fields, primarily focusing on biochemistry, genetics and molecular biology, materials science, and chemistry. These fields integrate studies on biochemical processes and molecular structures alongside materials development and chemical analysis.

The scientist's main subfields of study include materials chemistry, molecular biology, pharmacology, organic chemistry, and biochemistry. This multidisciplinary approach supports extensive research on alkaloids, crystallization processes, and bioanalytical techniques.

Toh-Seok Kam has contributed to topics such as:

  • Alkaloids: synthesis and pharmacology
  • Traditional and Medicinal Uses of Annonaceae
  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Berberine and alkaloids research
  • Chemical synthesis and alkaloids
  • Advanced biosensing and bioanalysis techniques

Some of the recent papers authored or co-authored by Toh-Seok Kam include:

  • Apoferritin-Encapsulated Jerantinine A for Transferrin Receptor Targeting and Enhanced Selectivity in Breast Cancer Therapy, 2022, ACS Omega
  • The Bisindole Alkaloids Angustilongines M and A from Alstonia penangiana Induce Mitochondrial Apoptosis and G0/G1 Cell Cycle Arrest in HT-29 Cells through Promotion of Tubulin Polymerization, 2021, Journal of Natural Products
  • The natural alkaloid Jerantinine B has activity in acute myeloid leukemia cells through a mechanism involving c-Jun, 2020, BMC Cancer
  • Macroline, talpinine, and sarpagine alkaloids from Alstonia penangiana. An NMR-based method for differentiating between A. penangiana and A. macrophylla, 2020, Phytochemistry
  • Arbolodinines A−C, biologically-active aspidofractinine-aspidofractinine, aspidofractinine-strychnan, and kopsine-strychnan bisindole alkaloids from Kopsia arborea, 2020, Tetrahedron

The researcher often collaborates with other scientists, with frequent co-authors including Yun-Yee Low, Kuan-Hon Lim, Siew-Huah Lim, Tracey D. Bradshaw, and Chun Hoe Tan.

Publication venues where Toh-Seok Kam regularly appears include The Cambridge Structural Database, Angewandte Chemie, ACS Omega, Journal of Natural Products, and Phytochemistry, reflecting a broad range of scientific journals in chemistry and molecular biology.

Best Publications

  • Biologically active indole alkaloids from Kopsia arborea.

    Kuan-Hon Lim;Osamu Hiraku;Kanki Komiyama;Takashi Koyano

  • Alkaloids from Kopsia griffithii

    Toh-Seok Kam;Kooi-Mow Sim

  • Biologically Active Aspidofractinine, Rhazinilam, Akuammiline, and Vincorine Alkaloids from Kopsia

    G Subramaniam;Osamu Hiraku;Masahiko Hayashi;Takashi Koyano

  • Lundurines A, B and C, new indole alkaloids with a novel carbon skeleton containing a cyclopropyl moiety

    Toh-Seok Kam;K. Yoganathan;Cheng-Hock Chuah

  • Bipleiophylline, an unprecedented cytotoxic bisindole alkaloid constituted from the bridging of two indole moieties by an aromatic spacer unit.

    Toh-Seok Kam;Shin-Jowl Tan;Seik-Weng Ng;Kanki Komiyama

  • Mersicarpine, an unusual tetracyclic dihydroindole alkaloid incorporating a seven-membered imine ring

    Toh-Seok Kam;G Subramaniam;Kuan-Hon Lim;Yeun-Mun Choo

  • Leishmanicidal alkaloids from Kopsia griffithii

    Toh-Seok Kam;Kooi-Mow Sim;Takashi Koyano;Kanki Komiyama

  • Lundurines A-D, cytotoxic indole alkaloids incorporating a cyclopropyl moiety from Kopsia tenuis and revision of the structures of tenuisines A-C

    Toh-Seok Kam;Kuan-Hon Lim;K. Yoganathan;Masahiko Hayashi

  • Jerantinines A−G, Cytotoxic Aspidosperma Alkaloids from Tabernaemontana corymbosa

    Kuan-Hon Lim;Osamu Hiraku;Kanki Komiyama;Toh-Seok Kam

  • Alkaloids from Kopsia dasyrachis

    Toh-Seok Kam;G Subramaniam;Wei Chen

  • Plumeran alkaloids from Kopsia profunda

    Toh-Seok Kam;Poh-Suan Tan

  • Grandilodines A−C, Biologically Active Indole Alkaloids from Kopsia grandifolia

    Wai-Sum Yap;Chew-Yan Gan;Yun-Yee Low;Yeun-Mun Choo

  • Dihydroflavonol BB-1, an extract of natural plant Blumea balsamifera, abrogates TRAIL resistance in leukemia cells.

    Hiroo Hasegawa;Yasuaki Yamada;Kanki Komiyama;Masahiko Hayashi

  • Conophylline and Conophyllidine: New Dimeric Alkaloids from Tabernaemontana divaricata

    Toh-Seok Kam;Kah-Yeng Loh;Chen Wei

  • Biologically active ibogan and vallesamine derivatives from Tabernaemontana divaricata.

    Toh-Seok Kam;Huey-Shen Pang;Yeun-Mun Choo;Kanki Komiyama

  • Arboflorine, an unusual pentacyclic monoterpenoid indole alkaloid incorporating a third nitrogen atom.

    Kuan-Hon Lim;Toh-Seok Kam

  • Biologically active indole and bisindole alkaloids from Tabernaemontana divaricata

    Toh-Seok Kam;Huey-Shen Pang;Tuck-Meng Lim

  • Tronocarpine, a novel pentacyclic indole incorporating a seven-membered lactam moiety

    Toh-Seok Kam;Kooi-Mow Sim;Tuck-Meng Lim

  • Leuconoxine, kopsinitarine, kopsijasmine, and kopsinone derivatives from Kopsia.

    Siew-Huah Lim;Kooi-Mow Sim;Zanariah Abdullah;Osamu Hiraku

  • Oxidized derivatives of macroline, sarpagine, and pleiocarpamine alkaloids from Alstonia angustifolia.

    Shin-Jowl Tan;Jun-Lee Lim;Yun-Yee Low;Kae-Shin Sim

  • New indole alkaloids from Alstonia macrophylla.

    Toh-Seok Kam;Yeun-Mun Choo

  • Alkaloids from Malaysian Flora

    Toh-Seok Kam

Frequent Co-Authors

Seik Weng Ng
Seik Weng Ng University of Malaya
Gerald Pattenden
Gerald Pattenden University of Nottingham
Nobuyuki Harada
Nobuyuki Harada Tohoku University
Martyn C. R. Symons
Martyn C. R. Symons De Montfort University
Michel O. Steinmetz
Michel O. Steinmetz Paul Scherrer Institute
Toshiyuki Sakai
Toshiyuki Sakai Kyoto Prefectural University of Medicine
Itaru Kojima
Itaru Kojima Gunma University
Brian J. Smith
Brian J. Smith QIMR Berghofer Medical Research Institute
Kazuyuki Sugahara
Kazuyuki Sugahara Hokkaido University
Shimeru Kamihira
Shimeru Kamihira Nagasaki University

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