Biological time / by Lecomte du Noüy.

  • Lecomte du Noüy, Pierre, 1883-1947. Temps et la vie. English
Date:
1936
Catalogue details

Licence: In copyright

Credit: Biological time / by Lecomte du Noüy. Source: Wellcome Collection.

    103/200 page 89
    saw in the first chapter on cicatrization when speaking of Carrel’s experiments, that epithelization is activated by the proximity of the epithelial edges. This enabled us to under- stand the double part played by grafts of skin. It was there- fore important to take this into account, the total gain on the FIG. 21. RATE OF HEALING AS A FUNCTION OF THE SIZE OF THE WOUND date calculated being from twelve to sixteen days. Now, the principal difference from a quantitative point of view between such a wound and one that is round or square is that the peri- meter, the length of the epithelial edge, is increased with respect to the area of the wound. It is therefore the shape which plays a part, for no perceptible differences are observed between wounds that are more or less indented, outside of sudden but momentary accelerations such as the one mentioned on page 82. I observed that the phenomenon of acceleration with respect to the curve calculated by means of formula (4) only begins to show slightly when the length is eight or nine times greater than the width. When the ratio is equal to 10 (length 10 cm., ^readth 1 cm. for example), it becomes very apparent. It
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