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Studies on Iodamœba Bütschlii (Protozoa) with Special Reference to Nuclear Structure

D. H. Wenrich
Proceedings of the American Philosophical Society
Vol. 77, No. 2 (Feb. 26, 1937), pp. 183-205
Stable URL: http://www.jstor.org/stable/984726
Page Count: 27
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Studies on Iodamœba Bütschlii (Protozoa) with Special Reference to Nuclear Structure
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Abstract

Iodamœba bütschlii was found in 1.53 per cent of 1700 human hosts and in 45.45 per cent of 55 apes and monkeys examined. Trophozoites ranged in diameter from 4 to 19 microns, and cysts from 7 to 13 microns. There is some evidence for the existence of a small race. In the relatively large vesicular nucleus of the trophozoite there is normally a large, smoothly rounded, centrally located endosome surrounded by the vesicular space in which the periendosomal granules form a single layer about midway between the endosome and the nuclear membrane. Variations in the endosome consisted of irregularities of size and shape, vesiculation, fragmentation and extrusion of globules into the vesicular space. Variations of the periendosomal granules consisted of differences in size, number and position or even their apparent absence. In the cysts the periendosomal granules normally aggregate into a crescent-shaped group at one side of the endosome. Variations consisted of dispersion of the granules of the crescent to various positions within the nucleus and vesiculation or fragmentation of the endosome. Chromatoid material, either as diffuse stainable material or in the form of definite bodies, is recognizable in addition to the small rounded "volutin" granules. Schaudinn's fluid and its more common modifications gave satisfactory fixation for both trophozoites and cysts. Addition of 10 per cent to 20 per cent of glacial acetic acid to Schaudinn's fluid tended to cause the endosome to lose its stainability in the cysts but not in the trophozoites. Bouin's fluid and its modifications gave fairly satisfactory fixation for the trophozoites but not for the cysts. Alcoholic Bouin's caused "buds" to be formed on cysts. Hæmalum stained the endosome more lightly than did iron-hæmatoxylin but stained the periendosomal granules intensely. The periendosomal granules are thought to constitute the chromosomal chromatin but definite determination of this point must await the working out of nuclear division in detail.

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