World's Best Scientists 2026 revealed!

D-Index & Metrics

Biology and Biochemistry

D-Index
128
Citations
64238
World Ranking
448
National Ranking
288

Sidney Udenfriend publication distribution in Biology and Biochemistry in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Biology and Biochemistry in 2026. The highlighted bar marks where Sidney Udenfriend sits on this spectrum.

47–56 publications: 8 scientists 57–66 publications: 35 scientists 67–76 publications: 106 scientists 77–86 publications: 231 scientists 87–96 publications: 414 scientists 97–106 publications: 546 scientists 107–116 publications: 704 scientists 117–126 publications: 849 scientists 127–136 publications: 980 scientists 137–146 publications: 942 scientists 147–156 publications: 969 scientists 157–166 publications: 950 scientists 167–176 publications: 951 scientists 177–186 publications: 915 scientists 187–196 publications: 787 scientists 197–206 publications: 841 scientists 207–216 publications: 735 scientists 217–226 publications: 709 scientists 227–236 publications: 651 scientists 237–246 publications: 605 scientists 247–256 publications: 510 scientists 257–266 publications: 524 scientists 267–276 publications: 434 scientists 277–286 publications: 418 scientists 287–296 publications: 350 scientists 297–306 publications: 363 scientists 307–316 publications: 315 scientists 317–326 publications: 296 scientists 327–336 publications: 261 scientists 337–346 publications: 240 scientists 347–356 publications: 219 scientists 357–366 publications: 197 scientists 367–376 publications: 154 scientists 377–386 publications: 161 scientists 387–396 publications: 155 scientists 397–406 publications: 145 scientists 407–416 publications: 124 scientists 417–426 publications: 112 scientists 427–436 publications: 132 scientists 437–446 publications: 116 scientists 447–456 publications: 99 scientists 457–466 publications: 81 scientists 467–476 publications: 91 scientists 477–486 publications: 80 scientists 487–496 publications: 80 scientists 497–506 publications: 60 scientists 507–516 publications: 36 scientists 517–526 publications: 46 scientists 527–536 publications: 54 scientists 537–546 publications: 44 scientists 547–556 publications: 43 scientists 557–566 publications: 43 scientists 567–576 publications: 42 scientists 577–586 publications: 25 scientists 587–596 publications: 34 scientists 597–606 publications: 23 scientists 607–616 publications: 33 scientists 617–626 publications: 31 scientists 627–636 publications: 27 scientists 637–646 publications: 25 scientists 647–656 publications: 28 scientists 657–666 publications: 34 scientists 667–676 publications: 18 scientists 677–686 publications: 16 scientists 687–696 publications: 10 scientists 697–706 publications: 12 scientists 707–716 publications: 21 scientists 717–726 publications: 12 scientists 727–736 publications: 12 scientists 737–746 publications: 10 scientists 747–756 publications: 7 scientists 757–766 publications: 13 scientists 767–776 publications: 15 scientists 777–786 publications: 13 scientists 787–796 publications: 9 scientists 797–806 publications: 9 scientists 807–816 publications: 7 scientists 817–826 publications: 4 scientists 827–836 publications: 9 scientists 837–846 publications: 7 scientists 847–856 publications: 3 scientists 857–866 publications: 5 scientists 867–876 publications: 5 scientists 877–886 publications: 11 scientists 887–896 publications: 3 scientists 897–906 publications: 4 scientists 907–916 publications: 7 scientists 917–926 publications: 5 scientists 927–936 publications: 6 scientists 937–946 publications: 6 scientists 947–956 publications: 3 scientists 957–966 publications: 7 scientists 967–976 publications: 2 scientists 977–986 publications: 2 scientists 987–996 publications: 1 scientists 997–1,006 publications: 5 scientists 1,007–1,016 publications: 2 scientists 1,017–1,026 publications: 2 scientists 1,027 publications: 1 scientists 1,028+ publications: 100 scientists
47 publications 1,028+

This scientist: 460 publications — 93rd percentile

93% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 1,028 publications or more.

Sidney Udenfriend D-index placement in Biology and Biochemistry in 2026

The chart shows the D-index (discipline H-index) distribution of Biology and Biochemistry scientists ranked by Research.com in 2026. The highlighted bar marks where Sidney Udenfriend sits on this spectrum.

40–41 D-Index: 80 scientists 42–43 D-Index: 183 scientists 44–45 D-Index: 317 scientists 46–47 D-Index: 504 scientists 48–49 D-Index: 718 scientists 50–51 D-Index: 900 scientists 52–53 D-Index: 1,026 scientists 54–55 D-Index: 1,150 scientists 56–57 D-Index: 1,236 scientists 58–59 D-Index: 1,253 scientists 60–61 D-Index: 1,163 scientists 62–63 D-Index: 1,131 scientists 64–65 D-Index: 1,032 scientists 66–67 D-Index: 897 scientists 68–69 D-Index: 814 scientists 70–71 D-Index: 715 scientists 72–73 D-Index: 709 scientists 74–75 D-Index: 596 scientists 76–77 D-Index: 512 scientists 78–79 D-Index: 473 scientists 80–81 D-Index: 412 scientists 82–83 D-Index: 373 scientists 84–85 D-Index: 358 scientists 86–87 D-Index: 285 scientists 88–89 D-Index: 273 scientists 90–91 D-Index: 227 scientists 92–93 D-Index: 208 scientists 94–95 D-Index: 193 scientists 96–97 D-Index: 153 scientists 98–99 D-Index: 157 scientists 100–101 D-Index: 148 scientists 102–103 D-Index: 120 scientists 104–105 D-Index: 113 scientists 106–107 D-Index: 100 scientists 108–109 D-Index: 86 scientists 110–111 D-Index: 67 scientists 112–113 D-Index: 72 scientists 114–115 D-Index: 73 scientists 116–117 D-Index: 64 scientists 118–119 D-Index: 53 scientists 120–121 D-Index: 60 scientists 122–123 D-Index: 54 scientists 124–125 D-Index: 43 scientists 126–127 D-Index: 38 scientists 128–129 D-Index: 49 scientists 130–131 D-Index: 26 scientists 132–133 D-Index: 18 scientists 134–135 D-Index: 23 scientists 136–137 D-Index: 32 scientists 138–139 D-Index: 32 scientists 140–141 D-Index: 27 scientists 142–143 D-Index: 19 scientists 144–145 D-Index: 22 scientists 146–147 D-Index: 12 scientists 148–149 D-Index: 16 scientists 150–151 D-Index: 14 scientists 152–153 D-Index: 10 scientists 154–155 D-Index: 13 scientists 156–157 D-Index: 10 scientists 158–159 D-Index: 7 scientists 160–161 D-Index: 9 scientists 162–163 D-Index: 13 scientists 164–165 D-Index: 4 scientists 166 D-Index: 4 scientists 167+ D-Index: 98 scientists
40 D-Index 167+

This scientist: 128 D-Index — 98th percentile

98% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 167 D-Index or more.

Research.com Recognitions

  • 1971 - Member of the National Academy of Sciences
  • 1967 - Canada Gairdner International Award
  • 1959 - Fellow of the American Association for the Advancement of Science (AAAS)

Overview

Sidney Udenfriend was affiliated with the Roche Institute of Molecular Biology in the United States. Their career involved scientific research primarily connected to molecular biology, though specific details about their fields and subfields of study are not documented here.

There are no listed recent publications, co-authors, or frequent publication venues associated with Sidney Udenfriend in the available data. Additionally, there is no record of book publications under their name.

Throughout their career, Sidney Udenfriend received recognition and awards from several institutions. These accolades included being named a Fellow of the American Association for the Advancement of Science (AAAS) in 1959. They were also awarded the Canada Gairdner International Award in 1967, a prize known for acknowledging significant contributions to medical science. Later, in 1971, Sidney Udenfriend was elected as a Member of the National Academy of Sciences, reflecting their standing within the scientific community.

Sidney Udenfriend is deceased. The available data does not specify the year of death or additional biographical details beyond their professional affiliations and awards.

Best Publications

  • Fluorescamine: A Reagent for Assay of Amino Acids, Peptides, Proteins, and Primary Amines in the Picomole Range

    Sidney Udenfriend;Stanley Stein;Peter Böhlen;Wallace Dairman

  • TYROSINE HYDROXYLASE. THE INITIAL STEP IN NOREPINEPHRINE BIOSYNTHESIS.

    Toshiharu Nagatsu;Morton Levitt;Sidney Udenfriend

  • Fluorometric assay of proteins in the nanogram range

    Peter Böhlen;Stanley Stein;Wallace Dairman;Sidney Udenfriend

  • ELUCIDATION OF THE RATE-LIMITING STEP IN NOREPINEPHRINE BIOSYNTHESIS IN THE PERFUSED GUINEA-PIG HEART

    Morton Levitt;Sydney Spector;Albert Sjoerdsma;Sidney Udenfriend

  • A specific method for the analysis of hydroxyproline in tissues and urine.

    Darwin J. Prockop;Sidney Udenfriend

  • Identification and assay of serotonin in brain.

    Donald F. Bogdanski;Alfred Pletscher;Bernard B. Brodie;Sidney Udenfriend

  • BLOCKADE OF ENDOGENOUS NOREPINEPHRINE SYNTHESIS BY ALPHA-METHYL-TYROSINE, AN INHIBITOR OF TYROSINE HYDROXYLASE.

    S. Spector;A. Sjoerdsma;S. Udenfriend

  • Aromatic l-Amino Acid Decarboxylase

    W. Lovenberg;Herbert Weissbach;Sidney Udenfriend

  • Ascorbic acid in aromatic hydroxylation. I. A model system for aromatic hydroxylation.

    Sidney Udenfriend;Carroll T. Clark;Julius Axelrod;Bernard B. Brodie

  • Molecular cloning establishes proenkephalin as precursor of enkephalin-containing peptides

    U. Gubler;Peter H. Seeburg;B. J. Hoffman;L. P. Gage

  • Hydroxylation-Induced Migration: The NIH Shift Recent experiments reveal an unexpected and general result of enzymatic hydroxylation of aromatic compounds

    Gordon Guroff;Jean Renson;Sidney Udenfriend;John W. Daly

  • How glycosylphosphatidylinositol-anchored membrane proteins are made.

    Sidney Udenfriend;Krishna Kodukula

  • The identification of 5-hydroxy-3-indoleacetic acid in normal urine and a method for its assay.

    Sidney Udenfriend;Elwood Titus;Herbert Weissbach

  • Photometric Assay of Dopamine-β-Hydroxylase Activity in Human Blood

    Toshiharu Nagatsu;Sidney Udenfriend

  • A RAPID AND SIMPLE RADIOASSAY FOR TYROSINE HYDROXYLASE ACTIVITY.

    Toshiharu Nagatsu;Morton Levitt;Sidney Udenfriend

  • 1,2-naphthalene oxide as an intermediate in the microsomal hydroxylation of naphthalene.

    Donald M. Jerina;John W. Daly;Bernhard Witkop;P. Zaltzman-Nirenberg

  • The Use of Dopamine β-Hydroxylase as a Marker for the Central Noradrenergic Nervous System in Rat Brain

    Boyd K. Hartman;Doris Zide;Sidney Udenfriend

  • The estimation of 5-hydroxytryptamine (serotonin) in biological tissues.

    Sidney Udenfriend;Herbert Weissbach;Carroll T. Clark

  • A Rapid Spectrophotometric Assay of Monoamine Oxidase Based on the Rate of Disappearance of Kynuramine

    Herbert Weissbach;Thomas E. Smith;John W. Daly;Bernhard Witkop

  • Amino acid analysis with fluorescamine at the picomole level

    S. Stein;P. Böhlen;J. Stone;W. Dairman

Frequent Co-Authors

Herbert Weissbach
Herbert Weissbach Florida Atlantic University
Stanley Stein
Stanley Stein Rutgers, The State University of New Jersey
Albert Sjoerdsma
Albert Sjoerdsma National Institutes of Health
Bernhard Witkop
Bernhard Witkop National Institutes of Health
Randolph V. Lewis
Randolph V. Lewis Utah State University
Gordon Guroff
Gordon Guroff National Institutes of Health
John W. Daly
John W. Daly National Institutes of Health
Bernard B. Brodie
Bernard B. Brodie National Institutes of Health
Sadao Kimura
Sadao Kimura Chiba University
John J. Hutton
John J. Hutton University of Cincinnati

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