publication . Article . 2003

Fine structure of nucleoli in the ciliate Didinium nasutum*

Karajan, Bella; Popenko, Vladimir; Leonova, Olga;
Open Access Russian
  • Published: 01 Jan 2003 Journal: Protistology (issn: 1680-0826, Copyright policy)
  • Publisher: Государственное образовательное учреждение высшего образования «Пензенский государственный университет»
Abstract
The macronuclear nucleoli of vegetative non-dividing cells of Didinium nasutum display inverted position of the main parts: the granular component is inside and the dense fibrillar one, in form of discrete bands, is mainly at the periphery. Before binary fission, the nucleoli are degranulated and their fibrillar bands scatter throughout the macronucleus, to be segregated during division between the daughter cells, where they begin to re-form the granular parts. In young resting cysts small nucleoli consist of granular material only, larger nucleoli show a clear segregation of its fibrillar and granular elements. During conjugation, nucleoli of the old macronucle...
Subjects
Medical Subject Headings: endocrine systemurogenital system
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