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By C. H. Werkman and P. W. Wilson (Eds.)

ISBN-10: 1483231364

ISBN-13: 9781483231365

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The axial black line repre­ sents the shrunken protoplasm. From Knaysi, 1941a. FIG. 11. Strain C4 of Bacillus subtilis. Sister cells shadowed with chromium. Note the well-developed lateral flagella. An electron micrograph taken by Knaysi and Hillier. Magnification = 8,000. cell wall is readily demonstrable with the electron microscope (Figs. 2) but has a low affinity for dyes and is not colored in ordinary staining procedure ; it stains to a certain extent when the cells are mounted in the dye solution, and more deeply when this is done after treatment of the cells with a mordant (Fig.

In bacteria, it appears chiefly as amorphous granules in the cytoplasm or dissolved in the cell-sap vacuole. Study of the yeast Hansenula anomala shows that even in the cytoplasm volutin is partly in solution. Volutin granules are more réfringent than the cytoplasm and can be observed in dark-field and with the electron microscope. They probably constitute most of the so-called Babes-Ernst granules. Volutin has a great affinity for basic and neutral dyes and may be readily seen when the cells are suspended in dilute aqueous solutions of méthylène blue, cresyl blue, or neutral red (Fig.

In Mycobacteriwn tuberculosis, vacuoles morphologically similar to cell-sap vacuoles are constantly present and appear to contain variable amounts of material, probably utilizable metabolic products known as reserve material; the situation is similar in Thiobacillus thiooxidans where, depending on the medium, the vacuolar material has been identified as volutin or as a mixture of volutin and sulfur. In the last two organisms, the vacuole may still be performing a regulatory function. 2. Volutin Inclusions Volutin is the name given by Arthur Meyer to inclusions which con­ sist chiefly of free ribonucleic acid.

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Bacterial Physiology by C. H. Werkman and P. W. Wilson (Eds.)

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