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Volumn 30, Issue 1, 1997, Pages 91-120

Heterotrophic CO2-Fixation, Mentors, and Students: The Wood-Werkman Reactions

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; BIOCHEMISTRY; BIOLOGY; HISTORY; PERSONNEL; UNITED STATES;

EID: 0031086592     PISSN: 00225010     EISSN: None     Source Type: Journal    
DOI: 10.1023/a:1004270612446     Document Type: Article
Times cited : (8)

References (110)
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    • 0003804679 scopus 로고    scopus 로고
    • Chicago: University of Chicago Press
    • D. L. Hull, Science as a Process (Chicago: University of Chicago Press, 1988), p. 18.
    • (1988) Science as a Process , pp. 18
    • Hull, D.L.1
  • 6
  • 7
    • 2442507048 scopus 로고    scopus 로고
    • note
    • I intend the notion "student" here in its most generic sense to include undergraduate research assistants, graduate students, and postdoctoral associates.
  • 9
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    • Philadelphia: American Philosophical Society
    • J. S. Fruton, Contrasts in Scientific Style (Philadelphia: American Philosophical Society, 1990), p. 2.
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  • 13
    • 2442504952 scopus 로고    scopus 로고
    • note
    • The notion of "social pressures" can have two meanings for science: there are pressures that arise from the peculiar context, practice, and structure of science itself; and there are also broader pressures, such as the historical time within which a science develops, that arise from society at large.
  • 14
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    • Chester Hamlin Werkman, 1893-1962
    • R. W. Brown, "Chester Hamlin Werkman, 1893-1962," Biog. Mem. Nat. Acad. Sci., 44 (1974), 335.
    • (1974) Biog. Mem. Nat. Acad. Sci. , vol.44 , pp. 335
    • Brown, R.W.1
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    • Official publication, Iowa State College of Agricultural and Mechanical Arts, "The Graduate College," Annual Courses, Summer Quarter 1932, p. 5.
    • (1932) Annual Courses, Summer Quarter , pp. 5
  • 16
    • 2442498663 scopus 로고    scopus 로고
    • Kluyver, Archives, Technical University of Delft, Delft, The Netherlands
    • Kluyver, Archives, Technical University of Delft, Delft, The Netherlands.
  • 17
    • 77956791360 scopus 로고    scopus 로고
    • Harland Goff Wood: An American Biochemist
    • ed. G. Semenza and R. Jaenicke (Amsterdam: Elsevier Science, in press)
    • R. Singleton, Jr., "Harland Goff Wood: An American Biochemist," in Comprehensive Biochemistry: History of Biochemistry, vol. 40, ed. G. Semenza and R. Jaenicke (Amsterdam: Elsevier Science, in press).
    • Comprehensive Biochemistry: History of Biochemistry , vol.40
    • Singleton Jr., R.1
  • 18
    • 2442622643 scopus 로고    scopus 로고
    • note
    • In stating the reaction in this fashion, I am taking some liberties with the initial report by Wood and Werkman. In their paper, they speculated about the nature of the various reactants and products involved in the reaction. Reaction 1 is an attempt to summarize the basic factual evidence of their report.
  • 19
    • 2442561683 scopus 로고
    • Mechanisms of Carbohydrate Metabolism: An Essay on Comparative Biochemistry
    • ed. F. F. Nord and C. H. Werkman New York: Interscience
    • E. S. G. Barron, 'Mechanisms of Carbohydrate Metabolism: An Essay on Comparative Biochemistry," in Advances in Enzymology, vol. 3, ed. F. F. Nord and C. H. Werkman (New York: Interscience, 1943), p. 169.
    • (1943) Advances in Enzymology , vol.3 , pp. 169
    • Barron, E.S.G.1
  • 20
    • 2442421287 scopus 로고
    • 2 Fixation in Heterotrophs. Gluconeogenesis
    • A History of Biochemistry, ed. M. Florkin and E. H. Stotz Amsterdam: Elsevier Scientific Publishing
    • 2 Fixation in Heterotrophs. Gluconeogenesis," in A History of Biochemistry, pt. 5, vol. 33a of Comprehensive Biochemistry, ed. M. Florkin and E. H. Stotz (Amsterdam: Elsevier Scientific Publishing, 1979), pp. 109-140; C. H. Werkman and H. G. Wood, "Heterotrophic Assimilation of Carbon Dioxide," in Advances in Enzymology, vol. 2, ed. F. F. Nord and C. H. Werkman (New York: Interscience, 1942), pp. 135-182; C. H. Werkman and H. G. Wood, "On the Metabolism of Bacteria," Bot. Rev., 8 (1942), 1-68.
    • (1979) Comprehensive Biochemistry , vol.33 A , Issue.5 PART , pp. 109-140
    • Florkin, M.1
  • 21
    • 0005098961 scopus 로고
    • Heterotrophic Assimilation of Carbon Dioxide
    • ed. F. F. Nord and C. H. Werkman New York: Interscience
    • 2 Fixation in Heterotrophs. Gluconeogenesis," in A History of Biochemistry, pt. 5, vol. 33a of Comprehensive Biochemistry, ed. M. Florkin and E. H. Stotz (Amsterdam: Elsevier Scientific Publishing, 1979), pp. 109-140; C. H. Werkman and H. G. Wood, "Heterotrophic Assimilation of Carbon Dioxide," in Advances in Enzymology, vol. 2, ed. F. F. Nord and C. H. Werkman (New York: Interscience, 1942), pp. 135-182; C. H. Werkman and H. G. Wood, "On the Metabolism of Bacteria," Bot. Rev., 8 (1942), 1-68.
    • (1942) Advances in Enzymology , vol.2 , pp. 135-182
    • Werkman, C.H.1    Wood, H.G.2
  • 22
    • 0343260709 scopus 로고
    • On the Metabolism of Bacteria
    • 2 Fixation in Heterotrophs. Gluconeogenesis," in A History of Biochemistry, pt. 5, vol. 33a of Comprehensive Biochemistry, ed. M. Florkin and E. H. Stotz (Amsterdam: Elsevier Scientific Publishing, 1979), pp. 109-140; C. H. Werkman and H. G. Wood, "Heterotrophic Assimilation of Carbon Dioxide," in Advances in Enzymology, vol. 2, ed. F. F. Nord and C. H. Werkman (New York: Interscience, 1942), pp. 135-182; C. H. Werkman and H. G. Wood, "On the Metabolism of Bacteria," Bot. Rev., 8 (1942), 1-68.
    • (1942) Bot. Rev. , vol.8 , pp. 1-68
    • Werkman, C.H.1    Wood, H.G.2
  • 23
    • 8544266339 scopus 로고
    • The Biochemistry of Bacteria
    • C. B. van Niel, "The Biochemistry of Bacteria," Ann. Rev. Biochem., 6 (1937), 608.
    • (1937) Ann. Rev. Biochem. , vol.6 , pp. 608
    • Van Niel, C.B.1
  • 24
    • 33747007562 scopus 로고
    • My Life and Carbon Dioxide Fixation
    • ed. J. F. Woessner, Jr., and F. Huijing New York: Academic Press
    • H. G. Wood, "My Life and Carbon Dioxide Fixation," in The Molecular Basis of Biological Transport, ed. J. F. Woessner, Jr., and F. Huijing (New York: Academic Press, 1972), p. 7.
    • (1972) The Molecular Basis of Biological Transport , pp. 7
    • Wood, H.G.1
  • 26
    • 0003504416 scopus 로고
    • (Report No. 46-8-3) Saskatoon: National Research Council of Canada
    • For further information on the fermentation balance technique, see A. C. Neish, Analytical Methods for Bacterial Fermentations, 2nd ed. (Report No. 46-8-3) (Saskatoon: National Research Council of Canada, 1952).
    • (1952) Analytical Methods for Bacterial Fermentations, 2nd Ed.
    • Neish, A.C.1
  • 29
    • 2442584792 scopus 로고    scopus 로고
    • unpub. interview, Beckman Center for the History of Chemistry
    • J. J. Bohning, "Harland G. Wood," unpub. interview, Beckman Center for the History of Chemistry, 1990, p. 11; Wood, "My Life" (above, n. 22), p. 5; Wood, "Then and Now" (above, n. 26), p. 8.
    • (1990) Harland G. Wood , pp. 11
    • Bohning, J.J.1
  • 30
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • J. J. Bohning, "Harland G. Wood," unpub. interview, Beckman Center for the History of Chemistry, 1990, p. 11; Wood, "My Life" (above, n. 22), p. 5; Wood, "Then and Now" (above, n. 26), p. 8.
    • My Life , pp. 5
    • Wood1
  • 31
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • J. J. Bohning, "Harland G. Wood," unpub. interview, Beckman Center for the History of Chemistry, 1990, p. 11; Wood, "My Life" (above, n. 22), p. 5; Wood, "Then and Now" (above, n. 26), p. 8.
    • Then and Now , pp. 8
    • Wood1
  • 32
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • 2-fixation, which may well have "primed" Wood to think about such a possibility to explain his anomalous data.
    • My Life , pp. 5
    • Wood1
  • 33
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22, emphasis added
    • Wood, "My Life" (above, n. 22), p. 5 (emphasis added).
    • My Life , pp. 5
    • Wood1
  • 35
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • See, for example, Table 1 in Wood, "My Life" (above, n. 22), p. 6.
    • My Life , pp. 6
    • Wood1
  • 36
    • 2442584791 scopus 로고
    • Trailing the Propionic Acid Bacteria
    • ed. A. Kornberg, B. L. Horecker, L. Cornudella, and J. Oro New York: Pergamon Press
    • H. G. Wood, "Trailing the Propionic Acid Bacteria," in Reflection on Biochemistry in Honor of Severo Ochoa, ed. A. Kornberg, B. L. Horecker, L. Cornudella, and J. Oro (New York: Pergamon Press, 1976), pp. 105-115.
    • (1976) Reflection on Biochemistry in Honor of Severo Ochoa , pp. 105-115
    • Wood, H.G.1
  • 37
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 5.
    • My Life , pp. 5
    • Wood1
  • 38
    • 2442588948 scopus 로고    scopus 로고
    • Ibid., p. 6.
    • My Life , pp. 6
  • 39
    • 2442500718 scopus 로고
    • 2 by the Propionic Acid Bacteria in the Dissimilation of Glycerol
    • 2 by the Propionic Acid Bacteria in the Dissimilation of Glycerol," J. Bacter., 30 (1935), 332.
    • (1935) J. Bacter. , vol.30 , pp. 332
    • Wood, H.G.1    Werkman, C.H.2
  • 40
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 8.
    • Then and Now , pp. 8
    • Wood1
  • 41
    • 0346970034 scopus 로고
    • 2 in the Dissimilation of Glycerol by the Propionic Acid Bacteria
    • 2 in the Dissimilation of Glycerol by the Propionic Acid Bacteria," Biochem. J., 30 (1936), 48-53.
    • (1936) Biochem. J. , vol.30 , pp. 48-53
    • Wood, H.G.1    Werkman, C.H.2
  • 42
    • 2442593085 scopus 로고    scopus 로고
    • note
    • For example, Wood's widow notes that the $50 monthly income the family received, they spent almost $34 on rent; to make financial ends meet, Wood tended the furnace of the apartment building in which they lived: Interview with Mildred D. Wood, Cleveland, Ohio, December 29, 1993.
  • 43
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 6.
    • My Life , pp. 6
    • Wood1
  • 44
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 9.
    • Then and Now , pp. 9
    • Wood1
  • 45
    • 2442419198 scopus 로고    scopus 로고
    • note
    • All of Wood's appointments are documented in Annual Budgets for Iowa State College, State of Iowa Board of Regents Minutes, Archives, Iowa State University, Ames, Iowa.
  • 46
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 7.
    • My Life , pp. 7
    • Wood1
  • 47
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26, emphasis added
    • Wood, "Then and Now" (above, n. 26), p. 9 (emphasis added).
    • Then and Now , pp. 9
    • Wood1
  • 49
    • 2442570130 scopus 로고    scopus 로고
    • I thank David Hull for bringing this point to my attention
    • I thank David Hull for bringing this point to my attention.
  • 50
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 13.
    • Then and Now , pp. 13
    • Wood1
  • 51
    • 2442548943 scopus 로고    scopus 로고
    • above, n. 14
    • All analysis of Werkman's publications is based on the extensive bibliography included in Brown, "Chester Hamlin Werkman" (above, n. 14).
    • Chester Hamlin Werkman
    • Brown1
  • 52
    • 2442515525 scopus 로고
    • A Macro-respirometer for the Study of the Anaerobic Metabolism of Microorganisms
    • H. G. Wood, C. A. Brewer, M. N. Mickelson, and C. H. Werkman, "A Macro-respirometer for the Study of the Anaerobic Metabolism of Microorganisms," Enzymologia, 8 (1940), 314-317.
    • (1940) Enzymologia , vol.8 , pp. 314-317
    • Wood, H.G.1    Brewer, C.A.2    Mickelson, M.N.3    Werkman, C.H.4
  • 54
    • 0003897632 scopus 로고
    • Although many scientific instruments were commercially available during this time, a hallmark of a skilled investigator was the ability to construct equipment necessary for research investigation; see Clarke and Fujimura, Right Tools for the Job. Like many of his contemporaries trained in chemistry, Wood was apparently a skilled glass worker. George Kalnitsky has remarked on Wood's skill at constructing the specialized flasks necessary for the modified Warburg apparatus. Kalnitsky further noted that Wood was one of the few people in the laboratory who could make the glass bulbs necessary for the construction of glass electrodes of pH measurement (G. Kalnitsky, letter to the author, October 1993).
    • (1993) Right Tools for the Job
    • Clarke1    Fujimura2
  • 55
    • 0039761905 scopus 로고
    • 2 by the Propionic Acid Bacteria
    • 2 by the Propionic Acid Bacteria," Biochem. J., 32 (1938), 1262-1271.
    • (1938) Biochem. J. , vol.32 , pp. 1262-1271
    • Wood, H.G.1    Werkman, C.H.2
  • 56
    • 2442425497 scopus 로고    scopus 로고
    • note
    • Bisulfite reacts with carbonyl groups in organic compounds to form stable complexes. If such compounds are intermediates in a metabolic pathway, the addition of bisulfite will inhibit the pathway and cause accumulation of the carbonyl-containing compound. Neuberg used the technique to great advantage in sorting out metabolic intermediates in yeast fermentations.
  • 57
    • 85088809589 scopus 로고    scopus 로고
    • above, n. 51
    • 2" (above, n. 51); H. G. Wood, R. W. Stone, and C. H. Werkman, "The Intermediate Metabolism of the Propionic Acid Bacteria," Biochem. J., 31 (1937), 349-359.
    • 2
    • Wood1    Werkman2
  • 58
    • 2442502789 scopus 로고
    • The Intermediate Metabolism of the Propionic Acid Bacteria
    • 2" (above, n. 51); H. G. Wood, R. W. Stone, and C. H. Werkman, "The Intermediate Metabolism of the Propionic Acid Bacteria," Biochem. J., 31 (1937), 349-359.
    • (1937) Biochem. J. , vol.31 , pp. 349-359
    • Wood, H.G.1    Stone, R.W.2    Werkman, C.H.3
  • 59
    • 2442612136 scopus 로고
    • Über die Propionsäuregärung, III
    • Ser. B
    • A. I. Virtanen and A. Karström, "Über die Propionsäuregärung, III," Acta Chem. Fennica, Ser. B, 7 (1931), 17.
    • (1931) Acta Chem. Fennica , vol.7 , pp. 17
    • Virtanen, A.I.1    Karström, A.2
  • 60
    • 0343696364 scopus 로고
    • Biochemistry: A Cross-disciplinary Endeavor That Discovered a Distinctive Domain
    • ed. idem Dordrecht: Martinus Nijhoff
    • W. Bechtel, "Biochemistry: A Cross-disciplinary Endeavor That Discovered a Distinctive Domain," in Integrating Scientific Disciplines, ed. idem (Dordrecht: Martinus Nijhoff, 1986), pp. 77-100; idem, "The Nature of Scientific Integration," in ibid., pp. 3-51.
    • (1986) Integrating Scientific Disciplines , pp. 77-100
    • Bechtel, W.1
  • 61
    • 0001939399 scopus 로고    scopus 로고
    • The Nature of Scientific Integration
    • W. Bechtel, "Biochemistry: A Cross-disciplinary Endeavor That Discovered a Distinctive Domain," in Integrating Scientific Disciplines, ed. idem (Dordrecht: Martinus Nijhoff, 1986), pp. 77-100; idem, "The Nature of Scientific Integration," in ibid., pp. 3-51.
    • Integrating Scientific Disciplines , pp. 3-51
    • Bechtel, W.1
  • 62
    • 2442463512 scopus 로고
    • 2 by Cell Suspensions of Propionibacterium pentesaceum
    • 2 to Succinic Acid Formation," ibid., pp. 129-138.
    • (1940) Biochem. J. , vol.34 , pp. 7-14
    • Wood, H.G.1    Werkman, C.H.2
  • 65
    • 0040947967 scopus 로고
    • 2-Fixing Enzyme from Propionic Acid Bacteria
    • 2-Fixing Enzyme from Propionic Acid Bacteria," J. Biol. Chem., 237 (1962), 3044-3051.
    • (1962) J. Biol. Chem. , vol.237 , pp. 3044-3051
    • Siu, P.M.L.1    Wood, H.G.2
  • 67
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 8.
    • My Life , pp. 8
    • Wood1
  • 68
    • 2442568048 scopus 로고
    • The Utilization of Carbon Dioxide in the Synthesis of α-ketoglutaric Acid
    • 2-fixation did not come from the Wood-Werkman laboratory.
    • (1940) J. Biol. Chem. , vol.136 , pp. 301-302
    • Evans Jr., E.A.1    Slotin, L.2
  • 69
    • 2442584792 scopus 로고    scopus 로고
    • above, n. 27
    • Bohning, "Harland G. Wood" (above, n. 27), p. 12; Wood, "My Life" (above, n. 22), p. 7; Wood, "Then and Now" (above, n. 26), p. 8.
    • Harland G. Wood , pp. 12
    • Bohning1
  • 70
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Bohning, "Harland G. Wood" (above, n. 27), p. 12; Wood, "My Life" (above, n. 22), p. 7; Wood, "Then and Now" (above, n. 26), p. 8.
    • My Life , pp. 7
    • Wood1
  • 71
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Bohning, "Harland G. Wood" (above, n. 27), p. 12; Wood, "My Life" (above, n. 22), p. 7; Wood, "Then and Now" (above, n. 26), p. 8.
    • Then and Now , pp. 8
    • Wood1
  • 72
    • 2442548939 scopus 로고
    • Bacterial Dissimilation of Carbohydrates
    • emphasis added
    • C. H. Werkman, "Bacterial Dissimilation of Carbohydrates," Bacter. Rev., 3 (1939), 190 (emphasis added).
    • (1939) Bacter. Rev. , vol.3 , pp. 190
    • Werkman, C.H.1
  • 74
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 8.
    • My Life , pp. 8
    • Wood1
  • 75
    • 85088809589 scopus 로고    scopus 로고
    • above, n. 51
    • 2" (above, n. 51), p. 1269.
    • 2 , pp. 1269
    • Wood1    Werkman2
  • 76
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 8.
    • My Life , pp. 8
    • Wood1
  • 79
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 11.
    • My Life , pp. 11
    • Wood1
  • 80
  • 83
    • 2442461284 scopus 로고    scopus 로고
    • above, n. 22
    • Wood, "My Life" (above, n. 22), p. 19.
    • My Life , pp. 19
    • Wood1
  • 84
    • 13544253240 scopus 로고
    • The Chemistry and Metabolism of Bacteria
    • emphasis added
    • H. A. Barker, "The Chemistry and Metabolism of Bacteria," Ann. Rev. Biochem., 10 (1941), 570 (emphasis added).
    • (1941) Ann. Rev. Biochem. , vol.10 , pp. 570
    • Barker, H.A.1
  • 85
    • 2442486001 scopus 로고    scopus 로고
    • note
    • The Eli Lilly Award, begun in 1936, is annually given by the American Society for Microbiology (ASM) to recognize young investigators (under the age of forty) who are making significant contributions to the science of microbiology. It is, perhaps, the ASM's most prestigious award. Several recipients have later won the Nobel Prize, and numerous recipients have later become members of the National Academy of Sciences.
  • 86
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 13.
    • Then and Now , pp. 13
    • Wood1
  • 87
    • 2442553142 scopus 로고    scopus 로고
    • Kalnitsky letter (above, n. 50)
    • Kalnitsky letter (above, n. 50).
  • 89
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 14.
    • Then and Now , pp. 14
    • Wood1
  • 95
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 15.
    • Then and Now , pp. 15
    • Wood1
  • 97
    • 2442631709 scopus 로고    scopus 로고
    • unpub. comments, May 18, 1963, private papers of Robert T. Werkman
    • R. W. Brown, "A Tribute to Chester Hamlin Werkman," unpub. comments, May 18, 1963, private papers of Robert T. Werkman.
    • A Tribute to Chester Hamlin Werkman
    • Brown, R.W.1
  • 99
    • 2442590995 scopus 로고    scopus 로고
    • Mrs. M. F. Utter, letter to the author, June 24, 1993
    • Mrs. M. F. Utter, letter to the author, June 24, 1993.
  • 100
    • 2442618459 scopus 로고    scopus 로고
    • Kalnitsky letter (above, n. 50)
    • Kalnitsky letter (above, n. 50).
  • 101
    • 2442454872 scopus 로고    scopus 로고
    • Interview with G. Kalnitsky, Iowa City, July 10, 1994
    • Interview with G. Kalnitsky, Iowa City, July 10, 1994.
  • 102
    • 2442513468 scopus 로고    scopus 로고
    • Eric Fowler, letter to the author, October 1, 1994
    • Eric Fowler, letter to the author, October 1, 1994.
  • 103
    • 2442504951 scopus 로고    scopus 로고
    • note
    • While it would be desirable to carry out such an analysis for all of Werkman's students, this is a difficult task. One difficulty rests in the absence of complete bibliographies for all of these individuals. A greater difficulty, however, is that Werkman's students often pursued other, quite varied, careers where publication was not as important. For example, Howard Reynolds (who was in the Werkman laboratory during the same time as Wood) spent much of his professional career working for the USDA and had around seventy-five publications (many of which were internal USDA reports) when he died (pers. comm. from Sandra [Reynolds] Miller); thus, his copublication with Werkman accounts for almost 20 percent of Reynolds' total publications.
  • 104
    • 2442438066 scopus 로고    scopus 로고
    • note
    • Calculating the frequency of co-authorship is complicated by the fact that the number of co-authors on an individual paper varies greatly both over time and by practice of individual primary authors. To correct for these variables, the frequency of co-authorship reported in Table 3 was determined as follows. The number of papers involving each co-author was divided by the primary author's total number of publications. This number was then multiplied by the ratio of (total papers)/(total authors) for each primary author and expressed as a percent.
  • 110
    • 2442504950 scopus 로고    scopus 로고
    • above, n. 26
    • Wood, "Then and Now" (above, n. 26), p. 2.
    • Then and Now , pp. 2
    • Wood1


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