World's Best Scientists 2026 revealed!

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Chemistry 41 17713 16020 4325 3561 81 7134

Ahsan U. Khan publications per year

The chart shows the history of publications by Ahsan U. Khan between 1962 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ahsan U. Khan published across 64 years, from 1962 to 2025, averaging 1.8 papers a year. Output peaked at 13 publications in 2025. 18 of the 112 publications appeared in the last two years.

No. of publications
5 10
Bar chart. Horizontal axis: year, 1962 to 2025. Vertical axis: number of publications, 0 to 13. Peak 13 publications in 2025. 1962: 1 publication 1963: 1 publication 1964: 1 publication 1965: 0 publications 1966: 1 publication 1967: 2 publications 1968: 2 publications 1969: 3 publications 1970: 5 publications 1971: 1 publication 1972: 1 publication 1973: 0 publications 1974: 3 publications 1975: 5 publications 1976: 6 publications 1977: 4 publications 1978: 1 publication 1979: 1 publication 1980: 2 publications 1981: 1 publication 1982: 2 publications 1983: 5 publications 1984: 6 publications 1985: 1 publication 1986: 4 publications 1987: 4 publications 1988: 1 publication 1989: 1 publication 1990: 1 publication 1991: 1 publication 1992: 3 publications 1993: 2 publications 1994: 2 publications 1995: 2 publications 1996: 0 publications 1997: 1 publication 1998: 1 publication 1999: 1 publication 2000: 1 publication 2001: 0 publications 2002: 0 publications 2003: 0 publications 2004: 0 publications 2005: 0 publications 2006: 0 publications 2007: 0 publications 2008: 0 publications 2009: 0 publications 2010: 0 publications 2011: 1 publication 2012: 0 publications 2013: 1 publication 2014: 0 publications 2015: 0 publications 2016: 4 publications 2017: 1 publication 2018: 0 publications 2019: 1 publication 2020: 2 publications 2021: 2 publications 2022: 1 publication 2023: 1 publication 2024: 5 publications 2025: 13 publications
1962 2025

112 publications in total across all disciplines

View publications per year as a table
Ahsan U. Khan: publications per year, 1962 to 2025
Year Publications
1962 1
1963 1
1964 1
1965 0
1966 1
1967 2
1968 2
1969 3
1970 5
1971 1
1972 1
1973 0
1974 3
1975 5
1976 6
1977 4
1978 1
1979 1
1980 2
1981 1
1982 2
1983 5
1984 6
1985 1
1986 4
1987 4
1988 1
1989 1
1990 1
1991 1
1992 3
1993 2
1994 2
1995 2
1996 0
1997 1
1998 1
1999 1
2000 1
2001 0
2002 0
2003 0
2004 0
2005 0
2006 0
2007 0
2008 0
2009 0
2010 0
2011 1
2012 0
2013 1
2014 0
2015 0
2016 4
2017 1
2018 0
2019 1
2020 2
2021 2
2022 1
2023 1
2024 5
2025 13
Total 112
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Ahsan U. Khan 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 Ahsan U. Khan 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, 81–100 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: 81 publications — 1st percentile

1% 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 81
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
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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Ahsan U. Khan 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 Ahsan U. Khan 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, 40–41 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: 41 D-Index — 2nd percentile

2% 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 41
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
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

Ahsan U. Khan is affiliated with New York University in the United States. Their research primarily focuses on medicine, with 34 publications in this main field. Within medicine, Khan's work extends into several subfields, notably surgery, gastroenterology, pulmonary and respiratory medicine, molecular biology, and speech and hearing.

The scientist's research topics cover a range of areas, including renal and related cancers, gastroesophageal reflux and treatments, gastrointestinal motility and disorders, dysphagia assessment and management, genetic and kidney cyst diseases, esophageal and gastrointestinal pathology, and neuroscience and neuropharmacology research.

Among frequent co-authors who have collaborated with Ahsan U. Khan are Justin Kupec, Joanna Cunanan, Darren Bridgewater, Adnan Khan, and Kristina Cunanan.

Khan has published in various venues, with multiple contributions noted in the following journals:

  • Biological and Clinical Sciences Research Journal
  • Clinical Gastroenterology and Hepatology
  • Gastroenterology
  • The American Journal of Gastroenterology
  • The FASEB Journal

Their recent papers include:

  • "Application of Single Superphosphate with Humic Acid Improves the Growth, Yield and Phosphorus Uptake of Wheat (Triticum aestivum L.) in Calcareous Soil," published in 2020 in Agronomy
  • "Synthesis, Characterizations, Hirshfeld Surface Analysis, DFT, and NLO Study of a Schiff Base Derived from Trifluoromethyl Amine," published in 2024 in ACS Omega
  • "Experience with Esophagogastrointestinal Transit Scintigraphy in the Initial 229 Patients: Multiple Regions of Dysmotility Are Common," published in 2020 in Journal of Nuclear Medicine
  • "Minimal Kidney Disease Phenotype in Shroom3 Heterozygous Null Mice," published in 2023 in Canadian Journal of Kidney Health and Disease
  • "Hydro-Climatic variability in the Potohar Plateau of Indus River Basin under CMIP6 climate projections," published in 2024 in Theoretical and Applied Climatology

Best Publications

  • Chemiluminescence arising from simultaneous transitions in pairs of singlet oxygen molecules

    Ahsan U. Khan;Michael Kasha

  • Red Chemiluminescence of Molecular Oxygen in Aqueous Solution

    Ahsan Ullah Khan;Michael Kasha

  • Intracellular singlet oxygen generation by phagocytosing neutrophils in response to particles coated with a chemical trap.

    Marla J. Steinbeck;Ahsan U. Khan;Morris J. Karnovsky

  • The electronic structure of nitrogen dioxide. I. Multiconfiguration self‐consistent‐field calculation of the low‐lying electronic states

    Gregory D. Gillispie;Ahsan U. Khan;A. C. Wahl;R. P. Hosteny

  • Singlet Molecular Oxygen from Superoxide Anion and Sensitized Fluorescence of Organic Molecules

    Ahsan U. Khan

  • Role of Singlet Excited States of Molecular Oxygen in the Quenching of Organic Triplet States

    Kenji Kawaoka;A. U. Khan;David R. Kearns

  • Reactive oxygen species as cellular messengers

    Ahsan Ullah Khan;Thérèse Wilson

  • Singlet molecular oxygen in the Haber-Weiss reaction.

    Ahsan Ullah Khan;Michael Kasha

  • Direct spectroscopic observation of singlet oxygen emission at 1268 nm excited by sensitizing dyes of biological interest in liquid solution.

    A. U. Khan;M. Kasha

  • Physical Theory of Chemiluminescence in Systems Evolving Molecular Oxygen1

    A. U. Khan;M. Kasha

  • Extracellular production of singlet oxygen by stimulated macrophages quantified using 9,10-diphenylanthracene and perylene in a polystyrene film

    Marla J. Steinbeck;Ahsan U. Khan;Morris J. Karnovsky

  • Mechanism of four-level laser action in solution excimer and excited-state proton-transfer cases

    Ahsan U. Khan;Michael Kasha

  • Sensitized photooxygenation reactions and the role of singlet oxygen.

    David R. Kearns;Ahsan U. Khan

  • L-ascorbic acid quenching of singlet delta molecular oxygen in aqueous media: Generalized antioxidant property of vitamin C

    Pi-Tai Chou;Ahsan U. Khan

  • A proposed function for spermine and spermidine: protection of replicating DNA against damage by singlet oxygen.

    Ahsan U. Khan;Ying-Hua Mei;Therese Wilson

  • THE PHYSICS, CHEMISTRY, AND BIOLOGY, OF SINGLET MOLECULAR OXYGEN*

    Michael Kasha;Ahsan Ullah Khan

  • Spermine and spermidine protection of plasmid DNA against single-strand breaks induced by singlet oxygen

    A. U. Khan;P. Di Mascio;M. H. G. Medeiros;T. Wilson

  • Singlet molecular oxygen. A new kind of oxygen

    Unknown

  • Direct spectral evidence of the generation of singlet molecular oxygen (/sup 1/. delta. /sub g/) in the reaction of potassium superoxide with water

    Ahsan U. Khan

  • Synthesis and Cation-Mediated Electronic Interactions of Two Novel Classes of Porphyrin−Fullerene Hybrids

    Phil S. Baran;Regina R. Monaco;Ahsan U. Khan;David I. Schuster

  • The electronic structure of NO2. II. The ? 2B2← ? 2A1 and ? 2B1←? 2A1 absorption systems

    Gregory D. Gillispie;Ahsan U. Khan

Frequent Co-Authors

Michael Kasha
Michael Kasha Florida State University
E. J. Corey
E. J. Corey Harvard University
David R. Kearns
David R. Kearns University of California, Riverside
Phil S. Baran
Phil S. Baran Scripps Research Institute
Morris J. Karnovsky
Morris J. Karnovsky Harvard University
Stephen R. Wilson
Stephen R. Wilson Luna Innovations (United States)
David I. Schuster
David I. Schuster New York University
Pi-Tai Chou
Pi-Tai Chou National Taiwan University
Marisa H. G. Medeiros
Marisa H. G. Medeiros Universidade de São Paulo
Krystyna Frenkel
Krystyna Frenkel New York University

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