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Книга по требованию: The Monthly Microscopical Journal, Vol. 4

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Transactions of the Royal Microscopical Society, and Record of Histological Research at Home and Abroad (Classic Reprint)

Вес: 0.6 кг.
Год издания: 2015
Страниц: 376 Переплет: мягкая обложка
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Excerpt from The Monthly Microscopical Journal, Vol. 4: Transactions of the Royal Microscopical Society, and Record of Histological Research at Home and Abroad

Gluten was next selected for experiment. A sample was carefully prepared from wheaten flour, and a portion was introduced into a cane sugar solution. The gluten at first floated on the surface of the liquid, but in a few days it became much disintegrated and subsided to the bottom of the flask, and afterwards became gradually diffused throughout the liquid.

On the second or third day an action was observed in the sample, and small transparent cells were seen to be tolerably abundant, but they did not appear to possess much action. The sample was frequently examined for alcohol, but very little was found to have been produced; and at the end of thirty-four days it only contained 1 • 65 per cent of alcohol and 24 per cent of acid.

The spores or cells in this case had a bright nucleus similar to that which characterized the egg albumen cells. The gluten cells are represented on Plate LV., Fig. 2.

Wheaten flour albumen was next tried, and in the first instance a cold-water flour extract was prepared, the starch and other insoluble constituents being separated by filtration. The clear filtrate containing the albumen in solution was divided into two portions; to one 21 • 80 per cent, of glucose was added, and to the other about 15 per cent, of cane sugar.

In a day or two after the samples had been prepared they were both found to be full of microscopic animals, of which some were ovoid in form, and others consisted apparently of several minute joints. The portion to which the cane sugar had been added soon became thick and syrupy, and it was apparent that the sugar was being converted into mucilage.

The transformation of the cane sugar in a cold-water flour extract was a result which was entirely unexpected, and it is probable that the change in the sugar was induced through the operations of the little creatures present in the solution, for they all appeared to be extremely active, and apparently devouring some substance in solution.

At the expiration of twenty-four days the sample was examined for alcohol and acid, and it was found to contain six-tenths per cent, of acid, but no alcohol.

The portion of the extract to which glucose had been added became turbid and slightly mucilaginous; and at the expiration of twenty-four days the sample was examined for alcohol and acid, and it was found to contain '72 per cent, of acid but only O '17 per cent, of alcohol. There were present in the sample a few cells resembling those of yeast, but they appeared unhealthy and inactive.

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