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Ultrastructural Features of Spindle Microtubule Organization During the Neclear Division of Encephalitozoon hellem
Author(s) -
SACCHI LUCIANO,
BIGLIARDI ELISA,
LANZARINI PAOLO,
CORONA SILVIA,
GATTI SIMONETTA,
SCAGLIA MASSIMO
Publication year - 1997
Publication title -
journal of eukaryotic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 1066-5234
DOI - 10.1111/j.1550-7408.1997.tb05794.x
Subject(s) - biology , spindle pole body , spindle apparatus , mitosis , microtubule , microbiology and biotechnology , ultrastructure , cell division , centriole , cytoplasm , division (mathematics) , anatomy , genetics , cell , arithmetic , mathematics
SUMMARY Ultrastructural studies were carried out to describe the nuclear division cycel of a strain of Enephalitozoon hellem isolated from an Italina AIDS patient. The nuclear division occurs during the porliferative vegetative phase and it is characterized by the intranuclear mitosis and by the lack of centrioles. The spindle termini are electron dense spindle plaques (ESPs), resembling to the spindle pole bodies (SPBs) of Sacchoaromycetes. The ESPs are bifacial organella forming microtubules on both nucleoplasmic and cytoplasmic faces. In the outer layer of the spindle plaque are present vesicular elements lined by a double membrance of unknown function. The peculiar morphological feacture of E. hellem ESPs indicate that bothe intranclear spindle and cytoplasmic microtubules are involved in the nuclear division.