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- The trophozoite form, which measures 20 to 25 μm, is minimally mobile. The core of the trophozoite is slightly oval in shape with a nucleus surrounded by a thick membrane. Within this membrane, chromatin granules surround the large, eccentric, and irregular karyosome.
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Aug 23, 2023 · The core of the trophozoite is slightly oval in shape with a nucleus surrounded by a thick membrane. Within this membrane, chromatin granules surround the large, eccentric, and irregular karyosome. The cytoplasm contains large vacuoles and is typically granular with easily distinguishable ectoplasm and endoplasm.
- Akhlema Haidar, Orlando De Jesus
- 2023/02/12
E. coli trophozoites stained with trichrome. Trophozoites of Entamoeba coli usually measure 15–50 µm. The trophozoites have a single nucleus with a characteristically large, eccentric karyosome and coarse, irregular peripheral chromatin. The cytoplasm is usually coarsely granular and vacuolated (often described as “dirty” cytoplasm).
Usually, the amoeba is immobile, and keeps its round shape. This amoeba, in its trophozoite stage, is only visible in fresh, unfixed stool specimens. Sometimes the Entamoeba coli have parasites as well. One is the fungus Sphaerita spp. This fungus lives in the cytoplasm of the E. coli.
- E. coli
- Entamoeba
Trophozoites of E. coli measure 15–50 μm and have a single nucleus with irregular peripheral chromatin and a usually eccentric karyosome. The cytoplasm is often described as “dirty” and may contain vacuoles and ingested food particles, including bacteria, yeast, and even other intestinal protozoa. Cysts are 10–35 μm in diameter.
Entamoeba coli Entamoeba coli trophozoite E. coli trophozoite E. coli cyst E. coli cyst (iodine) a. Morphology - trophozoites range from 10 to 35 microns in diameter; cysts range from 10 to 30 microns in diameter and contain 8 to 16 nuclei when mature; the nucleus exhibits an eccentric karyosome with irregular, coarse chromatin.
The trophozoite stage of E. gingivalis is morphologically similar to that of E. histolytica, and the two should be differentiated, as both can be coughed up in sputum specimens (for the latter, when present in pulmonary abscesses).
Size: 20 – 25 µm (range 15 to 50 µm) – larger than E. histolytica. Shape: Irregular with blunt pseudopodia. Nucleus: One nucleus; Peripheral chromatin granules: irregularly distributed & coarse. Large, usually eccentric karyosome in nucleus. Cytoplasm appears coarse, often with vacuoles.
