World's Best Scientists 2026 revealed!

D-Index & Metrics

Chemistry

D-Index
41
Citations
7134
World Ranking
17713
National Ranking
4325

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.

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 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.

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.

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 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.

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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