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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 57 11127 10040 3037 2493 151 11129

Melvin Y. Okamura publications per year

The chart shows the history of publications by Melvin Y. Okamura between 1967 and 2018, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Melvin Y. Okamura published across 52 years, from 1967 to 2018, averaging 2.9 papers a year. Output peaked at 10 publications in 1995. 1 of the 151 publications appeared in the last two years.

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

151 publications in total across all disciplines

View publications per year as a table
Melvin Y. Okamura: publications per year, 1967 to 2018
Year Publications
1967 2
1968 1
1969 1
1970 0
1971 0
1972 1
1973 0
1974 3
1975 1
1976 0
1977 0
1978 1
1979 3
1980 1
1981 1
1982 3
1983 0
1984 5
1985 7
1986 3
1987 4
1988 5
1989 4
1990 9
1991 2
1992 4
1993 3
1994 3
1995 10
1996 2
1997 3
1998 9
1999 2
2000 4
2001 6
2002 6
2003 5
2004 7
2005 5
2006 1
2007 4
2008 4
2009 9
2010 3
2011 0
2012 1
2013 0
2014 2
2015 0
2016 0
2017 0
2018 1
Total 151
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Melvin Y. Okamura 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 Melvin Y. Okamura 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, 141–160 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: 151 publications — 14th percentile

14% 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 1,218 151
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
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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Melvin Y. Okamura 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 Melvin Y. Okamura 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, 56–57 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: 57 D-Index — 39th percentile

39% 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 57
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

Melvin Y. Okamura is affiliated with the University of California, San Diego in the United States. Their academic profile reflects a research career linked to this institution, although specific details about research areas, publications, and collaborations are not provided.

The available data does not list any recent papers authored or co-authored by Melvin Y. Okamura. Similarly, there is no information on frequent co-authors or collaborative networks that would indicate ongoing research partnerships.

No records are available regarding the venues where Melvin Y. Okamura has published research, including journals or conferences. This absence extends to book publications and publishers, about which no data is noted.

There is no detailed information concerning their main fields of study, subfields, or primary research topics. Consequently, the scope of their scientific inquiries and contributions remains unspecified in the provided data.

No awards or honors have been documented for Melvin Y. Okamura, and there is no indication that they are deceased.

Best Publications

  • Structure and function of bacterial photosynthetic reaction centres

    G. Feher;J. P. Allen;M. Y. Okamura;D. C. Rees

  • Primary acceptor in bacterial photosynthesis: obligatory role of ubiquinone in photoactive reaction centers of Rhodopseudomonas spheroides.

    M Y Okamura;R A Isaacson;G Feher

  • Proton and electron transfer in bacterial reaction centers.

    M.Y Okamura;M.L Paddock;M.S Graige;G Feher

  • Electron-transfer kinetics in photosynthetic reaction centers cooled to cryogenic temperatures in the charge-separated state: evidence for light-induced structural changes.

    D. Kleinfeld;M. Y. Okamura;George Feher

  • Protonation of interacting residues in a protein by a Monte Carlo method: application to lysozyme and the photosynthetic reaction center of Rhodobacter sphaeroides.

    P Beroza;D R Fredkin;M Y Okamura;G Feher

  • Pathway of proton transfer in bacterial reaction centers: replacement of glutamic acid 212 in the L subunit by glutamine inhibits quinone (secondary acceptor) turnover.

    M L Paddock;S H Rongey;G Feher;M Y Okamura

  • Iron-depleted reaction centers from Rhodopseudomonas sphaeroides R-26.1: characterization and reconstitution with Fe2+, Mn2+, Co2+, Ni2+, Cu2+, and Zn2+.

    R. J. Debus;G. Feher;M. Y. Okamura

  • Electron transfer in reaction centers of Rhodopseudomonas sphaeroides. I. Determination of the charge recombination pathway of D+QAQ(-)B and free energy and kinetic relations between Q(-)AQB and QAQ(-)B.

    D. Kleinfeld;M.Y. Okamura;G. Feher

  • Conformational gating of the electron transfer reaction QA-.QB --> QAQB-. in bacterial reaction centers of Rhodobacter sphaeroides determined by a driving force assay.

    M. S. Graige;G. Feher;M. Y. Okamura

  • Spectroscopic and kinetic properties of the transient intermediate acceptor in reaction centers of Rhodopseudomonas sphaeroides.

    M.Y. Okamura;R.A. Isaacson;G. Feher

  • Identification of an electron acceptor in reaction centers of Rhodopseudomonas spheroides by EPR spectroscopy

    G. Feher;M.Y. Okamura;J.D. McElroy

  • Mechanism of Proton-Coupled Electron Transfer for Quinone (QB) Reduction in Reaction Centers of Rb. Sphaeroides

    M. S. Graige;M. L. Paddock;J. M. Bruce;G. Feher

  • Electrostatic calculations of amino acid titration and electron transfer, Q-AQB-->QAQ-B, in the reaction center

    P. Beroza;D.R. Fredkin;M.Y. Okamura;G. Feher

  • Light-induced proton uptake by photosynthetic reaction centers from Rhodobacter sphaeroides R-26. I. Protonation of the one-electron states D+QA−, DQA−, D+QAQB−, and DQAQB−☆

    P.H. McPherson;M.Y. Okamura;G. Feher

  • X-ray structure determination of the cytochrome c2: reaction center electron transfer complex from Rhodobacter sphaeroides.

    Herbert L. Axelrod;Edward C. Abresch;Melvin Y. Okamura;Andrew P. Yeh

  • Characterization of reaction centers from photosynthetic bacteria. I. Subunit structure of the protein mediating the primary photochemistry in Rhodopseudomonas spheroides R-26.

    Unknown

  • Pathway of proton transfer in bacterial reaction centers: replacement of serine-L223 by alanine inhibits electron and proton transfers associated with reduction of quinone to dihydroquinone

    M L Paddock;P H McPherson;G Feher;M Y Okamura

  • The effect of an applied electric field on the charge recombination kinetics in reaction centers reconstituted in planar lipid bilayers

    A. Gopher;Y. Blatt;M. Schönfeld;M.Y. Okamura

  • LM complex of reaction centers from Rhodopseudomonas sphaeroides R-26: characterization and reconstitution with the H subunit

    R. J. Debus;G. Feher;M. Y. Okamura

  • The Stark effect in reaction centers from Rhodobacter sphaeroides R-26 and Rhodopseudomonas viridis.

    M Lösche;G Feher;M Y Okamura

  • Pathway of proton transfer in bacterial reaction centers : role of aspartate-L213 in proton transfers associated with reduction of quinone to dihydroquinone

    Paddock Ml;Rongey Sh;McPherson Ph;Juth A

Frequent Co-Authors

David Kleinfeld
David Kleinfeld University of California, San Diego
Hideki Kandori
Hideki Kandori Nagoya Institute of Technology
Wolfgang Lubitz
Wolfgang Lubitz Max Planck Society
José N. Onuchic
José N. Onuchic Rice University
James P. Allen
James P. Allen Arizona State University
Douglas C. Rees
Douglas C. Rees California Institute of Technology
Werner Mäntele
Werner Mäntele Goethe University Frankfurt
Francis Millett
Francis Millett University of Arkansas at Fayetteville
Jacques Breton
Jacques Breton CEA Saclay
Peter Brzezinski
Peter Brzezinski Stockholm University

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