Ultrastructure of XXXX hominis cysts.

@entity1 @entity45 @entity8184 @entity4653
@entity8184 hominis cysts were concentrated from @entity1 faeces by repeated washing in distilled water and centrifugation on Ficoll-Paque. This procedure gave a concentrated suspension of cysts without yielding any non-cystic forms. The cysts were examined by both transmission (TEM) and @entity4653 ( @entity4653 ). Cysts were surrounded by a fibrillar layer that appeared porous in @entity4653 . Many @entity45 without the fibrillar layer were also visible in @entity4653 . They were variable in shape but mostly circular to oval. The diameter of the cyst without the fibrillar layer was 3.5 microns in both TEM and @entity4653 . The nuclear structure was typical of @entity8184 and exhibited multiple mitochondria with poorly developed cristae. Glycogen was present in small to large clumps in the cytoplasm. The cyst wall was 5-100 nm thick and was bounded internally by an electron-dense plasmalemma.
