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D-Index & Metrics

Discipline name D-Index World Ranking National Ranking Publications Citations
Chemistry 96 1560 597 350 31257

Al L. Tappel publications per year

The chart shows the history of publications by Al L. Tappel between 1952 and 2023, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Al L. Tappel published across 72 years, from 1952 to 2023, averaging 4.9 papers a year. Output peaked at 16 publications in 1969. 1 of the 356 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1952 to 2023. Vertical axis: number of publications, 0 to 16. Peak 16 publications in 1969. 1952: 2 publications 1953: 4 publications 1954: 4 publications 1955: 4 publications 1956: 9 publications 1957: 9 publications 1958: 7 publications 1959: 7 publications 1960: 8 publications 1961: 11 publications 1962: 10 publications 1963: 4 publications 1964: 14 publications 1965: 7 publications 1966: 6 publications 1967: 10 publications 1968: 13 publications 1969: 16 publications 1970: 9 publications 1971: 8 publications 1972: 9 publications 1973: 13 publications 1974: 14 publications 1975: 6 publications 1976: 5 publications 1977: 5 publications 1978: 16 publications 1979: 6 publications 1980: 3 publications 1981: 7 publications 1982: 11 publications 1983: 8 publications 1984: 13 publications 1985: 7 publications 1986: 5 publications 1987: 3 publications 1988: 6 publications 1989: 8 publications 1990: 11 publications 1991: 4 publications 1992: 3 publications 1993: 7 publications 1994: 4 publications 1995: 3 publications 1996: 5 publications 1997: 1 publication 1998: 1 publication 1999: 2 publications 2000: 0 publications 2001: 0 publications 2002: 0 publications 2003: 0 publications 2004: 1 publication 2005: 2 publications 2006: 0 publications 2007: 1 publication 2008: 2 publications 2009: 0 publications 2010: 0 publications 2011: 0 publications 2012: 0 publications 2013: 0 publications 2014: 0 publications 2015: 0 publications 2016: 0 publications 2017: 0 publications 2018: 0 publications 2019: 1 publication 2020: 0 publications 2021: 0 publications 2022: 0 publications 2023: 1 publication
1952 2023

356 publications in total across all disciplines

View publications per year as a table
Al L. Tappel: publications per year, 1952 to 2023
Year Publications
1952 2
1953 4
1954 4
1955 4
1956 9
1957 9
1958 7
1959 7
1960 8
1961 11
1962 10
1963 4
1964 14
1965 7
1966 6
1967 10
1968 13
1969 16
1970 9
1971 8
1972 9
1973 13
1974 14
1975 6
1976 5
1977 5
1978 16
1979 6
1980 3
1981 7
1982 11
1983 8
1984 13
1985 7
1986 5
1987 3
1988 6
1989 8
1990 11
1991 4
1992 3
1993 7
1994 4
1995 3
1996 5
1997 1
1998 1
1999 2
2000 0
2001 0
2002 0
2003 0
2004 1
2005 2
2006 0
2007 1
2008 2
2009 0
2010 0
2011 0
2012 0
2013 0
2014 0
2015 0
2016 0
2017 0
2018 0
2019 1
2020 0
2021 0
2022 0
2023 1
Total 356
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Al L. Tappel publications per year - data summary

  • Al L. Tappel, a Chemistry scholar from University of California, Davis, has 356 publications recorded across 72 years, from 1952 to 2023.
  • The oldest publication on record dates to 1952 and the most recent to 2023.
  • The most productive years are 1969 and 1978, with 16 publications each.
  • The least productive years with any output are 1997, 1998, 2004, 2007 and others, with 1 publication each.
  • 18 of the 72 years in the span carry no publications at all (2000, 2001, 2002, 2003 and others).
  • The rate of publication averages 4.9 papers per year over the whole span, or 6.6 per year counting only the 54 years with at least one publication.
  • The last 5 years on the chart (2019-2023) hold 2 publications, <1% of the career total.
  • Split into equal eras - 1952-1975: 204 publications (8.5 per year); 1976-1999: 144 publications (6.0 per year); 2000-2023: 8 publications (0.3 per year).
  • Comparing the opening and closing eras, the overall trend of publication is declining.

Al L. Tappel 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 Al L. Tappel 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, 341–360 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: 350 publications — 73rd percentile

73% 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
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
341–360 628 350
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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Al L. Tappel publication distribution in Chemistry in 2026 - data summary

  • The chart plots the publication count of all 17,934 Chemistry scientists ranked by Research.com in 2026, grouped into 63 ranges running from 61–80 to 1,295+ publications.
  • Al L. Tappel, a Chemistry scholar from University of California, Davis, records 350 publications - the 73rd percentile of the discipline.
  • 73% of ranked Chemistry scientists score the same or lower than Al L. Tappel, and about 27% score higher.
  • The median of the discipline falls in the 241–260 publications range, and Al L. Tappel ranks above the median.
  • The most crowded range is 161–180 publications, holding 1,350 scientists (8% of the field).
  • 77% of the field sits in the lowest quarter of the value range (up to 361–380 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 1,295 publications or more, 100 scientists in all (<1% of the field).

Al L. Tappel 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 Al L. Tappel 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, 96–97 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: 96 D-Index — 92nd percentile

92% 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
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 96
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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Al L. Tappel D-index placement in Chemistry in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 17,934 Chemistry scientists ranked by Research.com in 2026, grouped into 61 ranges running from 40–41 to 159+ D-Index.
  • Al L. Tappel, a Chemistry scholar from University of California, Davis, records 96 D-Index - the 92nd percentile of the discipline.
  • 92% of ranked Chemistry scientists score the same or lower than Al L. Tappel, and about 8% score higher.
  • The median of the discipline falls in the 62–63 D-Index range, and Al L. Tappel ranks above the median.
  • The most crowded range is 56–57 D-Index, holding 1,051 scientists (6% of the field).
  • 70% of the field sits in the lowest quarter of the value range (up to 70–71 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 159 D-Index or more, 98 scientists in all (<1% of the field).

Research.com Recognitions

  • 1965 - Fellow of John Simon Guggenheim Memorial Foundation

Overview

Al L. Tappel was affiliated with the University of California, Davis in the United States. Their academic career was noted for work in various fields of study and research, although specific details about their main research topics or subfields are not listed in the available data.

There are no recorded publications, frequent co-authors, or publication venues associated with Al L. Tappel in the current data. Similarly, book publications or topics of work have not been documented.

Al L. Tappel was recognized with at least one significant award during their career. In 1965, they were named a Fellow of the John Simon Guggenheim Memorial Foundation.

Given the lack of detailed publication records or topic specifications, it is not possible to provide an extensive overview of their scientific contributions or thematic focus areas beyond their institutional affiliation and award recognition.

Best Publications

  • Lipid peroxidation measured as thiobarbituric acid-reactive substances in tissue slices: characterization and comparison with homogenates and microsomes.

    Cesar G. Fraga;Brian E. Leibovitz;Al L. Tappel

  • VITAMIN E AND FREE RADICAL PEROXIDATION OF LIPIDS

    A. L. Tappel

  • Identification of the catalytic site of rat liver glutathione peroxidase as selenocysteine

    John W. Forstrom;Jack J. Zakowski;Al L. Tappel

  • The Inhibition of Mitochondrial Peroxidation by Ubiquinone and Ubiquinol

    A. Mellors;A.L. Tappel

  • Measurement of fluorescent lipid peroxidation products in biological systems and tissues.

    B.L. Fletcher;C.J. Dillard;A.L. Tappel

  • Sensitive fluorometric method for tissue tocopherol analysis.

    Steve L. Taylor;Merton P. Lamden;AL L. Tappel

  • Purification and properties of rat lung soluble glutathione peroxidase

    Danny T.Y. Chiu;Frederick H. Stults;Al L. Tappel

  • Lipide peroxidation in isolated mitochondria

    A.L. Tappel;H. Zalkin

  • Unsaturated lipide oxidation catalyzed by hematin compounds.

    Tappel Al

  • The mechanism of the oxidation of unsaturated fatty acids catalyzed by hematin compounds.

    A.L. Tappel

  • Inhibition of lipide peroxidation in mitochondria by vitamin E

    A.L. Tappel;H. Zalkin

  • Hydrocarbon gases produced during in vitro peroxidation of polyunsaturated fatty acids and decomposition of preformed hydroperoxides

    Erich E. Dumelin;Al L. Tappel

  • Studies of the mechanism of vitamin E action. IV. Lipide peroxidation in the vitamin E-deficient rabbit.

    H. Zalkin;A.L. Tappel

  • Effect of Antioxidants and Nutrients on Lipid Peroxidation Fluorescent Products and Aging Parameters in the Mouse

    Al Tappel;Brian Fletcher;David Deamer

  • A new sensitive assay for the measurement of hydroperoxides

    Robert L. Heath;Al L. Tappel

  • Fluorescent products of lipid peroxidation of mitochondria and microsomes.

    C. J. Dillard;A. L. Tappel

  • Damage to proteins, enzymes, and amino acids by peroxidizing lipids.

    W.T. Roubal;A.L. Tappel

  • CHAPTER III – LIPID PEROXIDATION AND FLUORESCENT MOLECULAR DAMAGE TO MEMBRANES

    Unknown

  • Effect of dietary vitamin E on expiration of pentane and ethane by the rat

    Cora J. Dillard;Erich E. Dumelin;Al L. Tappel

  • A selenocysteine-containing selenium-transport protein in rat plasma.

    Marvin A. Motsenbocker;A.L. Tappel

  • Effect of dietary lipids and vitamin E on in vitro lipid peroxidation in rat liver and kidney homogenates.

    Miao-Lin Hu;Edwin N. Frankel;Brian E. Leibovitz;Al L. Tappel

Frequent Co-Authors

Cesar G. Fraga
Cesar G. Fraga University of California, Davis
Henrik J. Andersen
Henrik J. Andersen Arla Foods (Denmark)
Edwin N. Frankel
Edwin N. Frankel University of California, Davis
Darshan S. Kelley
Darshan S. Kelley US Department of Agriculture
John R. Whitaker
John R. Whitaker University of California, Davis
John S. O'Brien
John S. O'Brien University of California, San Diego

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