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Electron Microscope Study of the Exoerythrocytic Form of Plasmodium gallinaceum in Thin Sections of Infected Tissue Cultures *
Author(s) -
MEYER H.,
MUSACCHIO M. DE OLIVEIRA
Publication year - 1960
Publication title -
the journal of protozoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 0022-3921
DOI - 10.1111/j.1550-7408.1960.tb00734.x
Subject(s) - plasmodium gallinaceum , cytoplasm , electron microscope , biology , schizogony , microbiology and biotechnology , plasmodium (life cycle) , parasite hosting , ultrastructure , vacuole , bone canaliculus , anatomy , physics , plasmodium falciparum , optics , malaria , gametocyte , immunology , world wide web , computer science
SYNOPSIS. The exoerythrocytic forms of Plasmodium gallinaceum in thin sections of infected tissue cultures have been examined with the electron microscope. It was seen that important changes occur in the fine structure of the parasite during the various phases of the cycle. The cytoplasm of the merozoites at the beginning and at the end of each cycle shows a great electron density due to a fine granulation. Larger granules are found at one pole of the parasite. The merozoites have a large nucleus in the center, and an oval body of great electron density at one pole, the significance of which is unknown. Short canaliculi can also be seen in the cytoplasm, but no mitochondria have been found. The cytoplasm of the schizonts shows a low electron density. It contains small particles scattered irregularly throughout its whole mass. The nuclei are not well defined; the oval body observed in the merozoites apparently has disappeared. Short canaliculi are present everywhere; however, mitochondria could not be identified with certainty. In the final phase of the cycle, in the rosette formations, the cytoplasm assumes again the fine granular structure. The future merozoites are grouped around a cytoplasmic core, with which they are directly connected. The whole segmenter is situated in a vacuole formation. In cross sections of the merozoites an opening in the central pole has been observed.