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Ultrastructural and morphometrical analyses of the brown adipocyte nucleus in a hibernating dormouse
Author(s) -
Zancanaro Carlo,
Malatesta Manuela,
Vogel Peter,
Osculati Francesco,
Fakan Stanislav
Publication year - 1993
Publication title -
biology of the cell
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.543
H-Index - 85
eISSN - 1768-322X
pISSN - 0248-4900
DOI - 10.1016/0248-4900(93)90263-e
Subject(s) - biology , ultrastructure , nucleus , granule (geology) , context (archaeology) , dense granule , microbiology and biotechnology , anatomy , genetics , paleontology , toxoplasma gondii , antibody
Summary— The fine morphology, size, and perichromatin granule frequency were analysed in brown adipocyte nuclei from hibernating, arousing, and euthermic dormice, Muscardinus avellanarius . Unusual nuclear structural constituents such as nuclear amorphous bodies, coiled body‐like constituents and bundles of nucleoplasmic filaments were described as typical of hibernating nuclei. Morphometrical findings showed significant difference in total nuclear and nucleolar size in the three physiological conditions investigated as well as decreasing frequency of perichromatin granules in nuclei of hibernating to euthermic animals. A possible involvement of these granules in the intranuclear transport or storage of pre‐mRNA is discussed in the context of other experimental evidence.