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Nov 6, 2018 · The early cyst contains single nucleus. In case of E. histolytica, as the cyst matures, the nucleus undergoes two successive mitotic divisions to form two and then four nuclei. The mature cyst is quadrinucleate. Hence number of nucleus varies from one to four. It varies from one to eight in case of E. coli, and mature cyst contains eight.
In E. coli most of the supernucleate cysts are 16, although Brooke (1940) cited a case with more than 30 nuclei. In regard to E. histolytica most authors only mention eight. nuclei. Most text-books indicate that supernucleate cysts are rare in both species of Endamoeba, but more rare in E. histolytica.
Aug 23, 2023 · Mature Entamoeba coli Cyst. This trichrome-stained photomicrograph depicts a mature Entamoeba coli cyst containing five clearly visible nuclei and what may have been a sixth nucleus, which was outside the focal plane and, therefore, out of focus. The cyst also contained a visible chromatoid body.
Cysts of Entamoeba coli are usually spherical, but may be elongated, and measure 10 to 35 µm. Mature cysts typically have 8 nuclei but may have as many as 16 or more. Entamoeba coli is the only species in the genus encountered in humans with more than four nuclei in the cyst stage. The nuclei may be seen in unstained as well as stained specimens.
Entamoeba coli Introduction Entamoeba coli is a non-pathogenic amoeba with world wide distribution. Its life cycle is similar to that of E. histolytica but it does not have an invasive stage and do not ingest red blood cells. Morphology of Cysts Cysts of E. coli are 15 - 30 in diameter and contain 1 - 8 nuclei. Chromatoid bodies are not
Introduction. Entamoeba coli is one of many non-pathogenic protozoa found in humans. [1] It is transmitted through fecal-oral contact, and the mature cyst can be found in contaminated water. [2] Typically, these protozoa inhabit the large intestinal tract and can be identified in diagnostic stool specimens. [3]
Entamoeba caviae resembles Entamoeba coli from man ( Fig. 32 ). The trophozoites are 10.5–20.0 μm (14.4 μm) in diameter with an eccentric or central nucleolus. The ectoplasm and endoplasm are not clearly differentiated. Although Nie (1950) observed no cysts, both Holmes (1923) and Faust (1950) did. Cysts are rarely found.
