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Diffusion Theory in Biology: A Relic of Mechanistic Materialism

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Abstract

Diffusion theory explains in physical terms how materials move through a medium, e.g. water or a biological fluid. There are strong and widely acknowledged grounds for doubting the applicability of this theory in biology, although it continues to be accepted almost uncritically and taught as a basis of both biology and medicine. Our principal aim is to explore how this situation arose and has been allowed to continue seemingly unchallenged for more than 150 years. The main shortcomings of diffusion theory will be briefly reviewed to show that the entrenchment of this theory in the corpus of biological knowledge needs to be explained, especially as there are equally valid historical grounds for presuming that bulk fluid movement powered by the energy of cell metabolism plays a prominent note in the transport of molecules in the living body. First, the theory's evolution, notably from its origins in connection with the mechanistic materialist philosophy of mid nineteenth century physiology, is discussed. Following this, the entrenchment of the theory in twentieth century biology is analyzed in relation to three situations: the mechanism of oxygen transport between air and mammalian tissues; the structure and function of cell membranes; and the nature of the intermediary metabolism, with its implicit presumptions about the intracellular organization and the movement of molecules within it. In our final section, we consider several historically based alternatives to diffusion theory, all of which have their precursors in nineteenth and twentieth century philosophy of science.

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Authors and Affiliations

  1. Formerly of the Department of Biological Sciences, Napier University, Colinton Road, Edinburgh, EH10 5DT, U.K.

    Paul S. Agutter

  2. 129 Viceroy Close, Birmingham, B5 7UY, U.K.

    P. Colm Malone

  3. Cell Pathology, University of Aberdeen, MacRobert Building, 581 King Street, Aberdeen, AB24 5UA, U.K.

    Denys N. Wheatley

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Agutter, P.S., Malone, P.C. & Wheatley, D.N. Diffusion Theory in Biology: A Relic of Mechanistic Materialism. Journal of the History of Biology 33, 71–111 (2000). https://doi.org/10.1023/A:1004745516972

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