. The Biochemical journal, 1918. Biochemistry. THE THEORY OF GELS 361 concentration in the region next the spherite reduced. If the concentration fall sufficiently, crystallisation will be momentarily suspended or its velocity reduced until fresh supplies of nutrient material arrive. These considerations lead to the conclusion that substances of high molecular weight and such as exist in solution in the aggregated form, tend to crystallise in the form of spherites. It is reasonable to suppose, therefore, that the granules seen ultraraicroscopically in gels, which must have great specific surfa
. The Biochemical journal, 1918. Biochemistry. THE THEORY OF GELS 361 concentration in the region next the spherite reduced. If the concentration fall sufficiently, crystallisation will be momentarily suspended or its velocity reduced until fresh supplies of nutrient material arrive. These considerations lead to the conclusion that substances of high molecular weight and such as exist in solution in the aggregated form, tend to crystallise in the form of spherites. It is reasonable to suppose, therefore, that the granules seen ultraraicroscopically in gels, which must have great specific surface, actually consist of these spherical aggregates. Spherites of gelatin can easily be produced of microscopic size. A sample of dialysed gelatin precipitated by alcohol, was dissolved in about 100 parts of water and poured slowly into alcohol. The smallest trace of the precipitate brought on to a microscopic slide, showed a mass of innumerable transparent granules, round the edge of which individual grains could be seen. Under a magnification of about 800 the granules appeared perfectly spherical and translucent of about 0-5 to 2 mm. diameter (Fig. 1). No connection between the grains could be Fig. 1. Gelatin precipitated by alcohol x 800. The question next arises as to whether the micellae are themselves aggregated to form structures within the gel. On account of the small size of the micellae, the problem is the more difficult to solve. Ultramicroscopic examination of untreated gels gives no indication of such Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biochemical Society (Great Britain); University of Liverpool. Biochemical Dept. London [etc. ] Cambridge University Press
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