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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 47 15555 14029 3925 3220 136 8977

Patrik R. Callis publications per year

The chart shows the history of publications by Patrik R. Callis between 1964 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Patrik R. Callis published across 62 years, from 1964 to 2025, averaging 2.2 papers a year. Output peaked at 8 publications in 1994. 1 of the 138 publications appeared in the last two years.

No. of publications
2 4 6 8
Bar chart. Horizontal axis: year, 1964 to 2025. Vertical axis: number of publications, 0 to 8. Peak 8 publications in 1994. 1964: 1 publication 1965: 0 publications 1966: 0 publications 1967: 0 publications 1968: 0 publications 1969: 2 publications 1970: 2 publications 1971: 1 publication 1972: 1 publication 1973: 1 publication 1974: 0 publications 1975: 1 publication 1976: 2 publications 1977: 2 publications 1978: 0 publications 1979: 2 publications 1980: 2 publications 1981: 0 publications 1982: 3 publications 1983: 3 publications 1984: 3 publications 1985: 0 publications 1986: 2 publications 1987: 5 publications 1988: 2 publications 1989: 1 publication 1990: 5 publications 1991: 3 publications 1992: 4 publications 1993: 4 publications 1994: 8 publications 1995: 4 publications 1996: 2 publications 1997: 4 publications 1998: 1 publication 1999: 2 publications 2000: 3 publications 2001: 1 publication 2002: 2 publications 2003: 2 publications 2004: 1 publication 2005: 3 publications 2006: 4 publications 2007: 2 publications 2008: 1 publication 2009: 8 publications 2010: 3 publications 2011: 4 publications 2012: 6 publications 2013: 4 publications 2014: 5 publications 2015: 6 publications 2016: 0 publications 2017: 2 publications 2018: 1 publication 2019: 2 publications 2020: 2 publications 2021: 2 publications 2022: 0 publications 2023: 0 publications 2024: 0 publications 2025: 1 publication
1964 2025

138 publications in total across all disciplines

View publications per year as a table
Patrik R. Callis: publications per year, 1964 to 2025
Year Publications
1964 1
1965 0
1966 0
1967 0
1968 0
1969 2
1970 2
1971 1
1972 1
1973 1
1974 0
1975 1
1976 2
1977 2
1978 0
1979 2
1980 2
1981 0
1982 3
1983 3
1984 3
1985 0
1986 2
1987 5
1988 2
1989 1
1990 5
1991 3
1992 4
1993 4
1994 8
1995 4
1996 2
1997 4
1998 1
1999 2
2000 3
2001 1
2002 2
2003 2
2004 1
2005 3
2006 4
2007 2
2008 1
2009 8
2010 3
2011 4
2012 6
2013 4
2014 5
2015 6
2016 0
2017 2
2018 1
2019 2
2020 2
2021 2
2022 0
2023 0
2024 0
2025 1
Total 138
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Patrik R. Callis 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 Patrik R. Callis 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, 121–140 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: 136 publications — 9th percentile

9% 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
121–140 918 136
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
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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Patrik R. Callis 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 Patrik R. Callis 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: 47 D-Index — 14th percentile

14% 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 47
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

Patrik R. Callis is affiliated with Montana State University in the United States. Their research primarily falls within the field of Biochemistry, Genetics and Molecular Biology, including subfields such as Molecular Biology, Biophysics, Cellular and Molecular Neuroscience, Atomic and Molecular Physics and Optics, and Physical and Theoretical Chemistry.

The scientist's work focuses on topics including Protein Structure and Dynamics, Advanced Fluorescence Microscopy Techniques, Photoreceptor and Optogenetics Research, Receptor Mechanisms and Signaling, Spectroscopy and Quantum Chemical Studies, Photochemistry and Electron Transfer Studies, and Electrochemical Analysis and Applications.

Patrik R. Callis has published multiple research papers in various scientific journals. Some of the notable recent papers include:

  • Local Electric Field Controls Fluorescence Quantum Yield of Red and Far-Red Fluorescent Proteins, 2021, Frontiers in Molecular Biosciences
  • Buried Liquid Interfaces as a Form of Chemistry in Confinement: The Case of 4-Dimethylaminobenzonitrile at the Silica-Aqueous Interface, 2020, Journal of the American Chemical Society
  • Water as an Essential Cofactor for All Enzymes, 2020, Biophysical Journal
  • Water as a reactant in the first step of triosephosphate isomerase catalysis, 2021, bioRxiv (Cold Spring Harbor Laboratory)
  • Surveying Enzyme Crystal Structures Reveals the Commonality of Active-Site Solvent Accessibility and Enzymatic Water Networks, 2025, ACS Omega

The publication venues where Patrik R. Callis frequently contributes include:

  • Frontiers in Molecular Biosciences
  • Journal of the American Chemical Society
  • Biophysical Journal
  • bioRxiv (Cold Spring Harbor Laboratory)
  • ACS Omega

The scientist collaborates regularly with several researchers, with frequent co-authors including Pedro L. Muíño, Mikhail Drobizhev, Rosana S. Molina, J. Nathan Scott, and Gerard G. Lambert.

Best Publications

  • Mechanisms of Tryptophan Fluorescence Shifts in Proteins

    James T. Vivian;Patrik R. Callis

  • Fluorometric determination of the neutral lipid content of microalgal cells using Nile Red

    Keith E. Cooksey;James B. Guckert;Scott A. Williams;Patrik R. Callis

  • 1LA AND 1LB TRANSITIONS OF TRYPTOPHAN : APPLICATIONS OF THEORY AND EXPERIMENTAL OBSERVATIONS TO FLUORESCENCE OF PROTEINS

    Patrik R. Callis

  • TRYPTOPHAN FLUORESCENCE SHIFTS IN PROTEINS FROM HYBRID SIMULATIONS: AN ELECTROSTATIC APPROACH

    Patrik R. Callis;Berit K. Burgess

  • Photophysics of indole derivatives : experimental resolution of La and Lb transitions and comparison with theory

    Maurice R. Eftink;LeRoy A. Selvidge;Patrik R. Callis;Aden A. Rehms

  • Advances in calculating Raman excitation profiles by means of the transform theory

    B. R. Stallard;P. M. Champion;Patrik R. Callis;A. C. Albrecht

  • Hybrid simulations of solvation effects on electronic spectra: Indoles in water

    Pedro L. Muiño;Patrik R. Callis

  • Perturbation selection rules for multiphoton electronic spectroscopy of neutral alternant hydrocarbonsa)

    Patrik R. Callis;Thomas W. Scott;A. C. Albrecht

  • Understanding the variable fluorescence quantum yield of tryptophan in proteins using QM-MM simulations. Quenching by charge transfer to the peptide backbone

    Patrik R. Callis;James T. Vivian

  • Mechanism of the Very Efficient Quenching of Tryptophan Fluorescence in Human γD- and γS-Crystallins: The γ-Crystallin Fold May Have Evolved To Protect Tryptophan Residues from Ultraviolet Photodamage†

    Jiejin Chen;Patrik R. Callis;Jonathan King

  • Mechanism of the Highly Efficient Quenching of Tryptophan Fluorescence in Human γD-Crystallin†

    Jiejin Chen;Shannon L Flaugh;Patrik R Callis;Jonathan King

  • Molecular orbital theory of the 1<i>L</i> <i>b</i> and 1<i>L</i> <i>a</i> states of indole

    Unknown

  • Two-photon-induced fluorescence.

    Patrik R. Callis

  • Molecular Orbital Theory of the 1La and 1Lb States of Indole. 2. An ab Initio Study

    Lee S. Slater;Patrik R. Callis

  • Application of the transform theory to resonance Raman excitation profiles in the Soret region of cytochrome‐c

    B. R. Stallard;P. R. Callis;P. M. Champion;A. C. Albrecht

  • AB INITIO CALCULATIONS OF VIBRONIC SPECTRA FOR INDOLE

    Patrik R. Callis;James T. Vivian;Lee S. Slater

  • Two-photon fluorescence excitation spectra of aromatic amino acids

    Aden A. Rehms;Patrik R. Callis

  • FLUORESCENT TAUTOMERS AND THE APPARENT PHOTOPHYSICS OF ADENINE AND GUANINE

    Robert W. Wilson;Patrik R. Callis

  • Resolution of La and Lb bands in methyl indoles by two-photon spectroscopy

    Aden A. Rehms;Patrik R. Callis

  • Ionization Potentials of Fluoroindoles and the Origin of Nonexponential Tryptophan Fluorescence Decay in Proteins

    TQ Liu;PR Callis;BH Hesp;M de Groot

  • Fluorescence lifetime measurements of fluoranthene, 1-naphthol, and napropamide in the presence of dissolved humic Acid.

    Shaojin. Chen;William P. Inskeep;Scott A. Williams;Patrik R. Callis

  • Fluorescence of reduced nicotinamides using one- and two-photon excitation.

    Borys Kierdaszuk;Borys Kierdaszuk;Henryk Malak;Ignacy Gryczynski;Patrik Callis

Frequent Co-Authors

Bruce S. Hudson
Bruce S. Hudson Syracuse University
Joseph R. Lakowicz
Joseph R. Lakowicz University of Maryland, Baltimore
Robert J. Twieg
Robert J. Twieg Kent State University
Bern Kohler
Bern Kohler The Ohio State University
Ignacy Gryczynski
Ignacy Gryczynski University of North Texas Health Science Center
Robert W. Woody
Robert W. Woody Colorado State University
William P. Inskeep
William P. Inskeep Montana State University
W. E. Moerner
W. E. Moerner Stanford University
Angela M. Gronenborn
Angela M. Gronenborn University of Pittsburgh

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