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THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane

The unicellular organism, Noctiluca, has been examined with the electron microscope. The nucleus is small compared to the very large size of the cell, but the nuclear border has an organization which indicates an active nucleocytoplasmic exchange. Whereas annuli are missing over most parts of the nu...

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Autor principal: Afzelius, Björn A.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1963
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2106862/
https://www.ncbi.nlm.nih.gov/pubmed/19866634
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author Afzelius, Björn A.
author_facet Afzelius, Björn A.
author_sort Afzelius, Björn A.
collection PubMed
description The unicellular organism, Noctiluca, has been examined with the electron microscope. The nucleus is small compared to the very large size of the cell, but the nuclear border has an organization which indicates an active nucleocytoplasmic exchange. Whereas annuli are missing over most parts of the nuclear membrane proper, there are "annulated vesicles" in a layer inside the nuclear membrane. The hypothesis is put forth that nuclear substances move through the annuli into these vesicles, and that the annulated vesicles themselves are transported through the nuclear membrane. The various forms of the annulated vesicles are consistent with this hypothesis. An implication of this postulate is the synthesis of annulated membranes inside a closed nucleus which are physically separate from the endoplasmic reticulum. The chromosomes are in a state resembling prophase chromosomes and are surrounded by granular masses. Only a small portion of the entire nuclear volume is occupied by the chromosomes. There are many nucleolus-like bodies.
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spelling pubmed-21068622008-05-01 THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane Afzelius, Björn A. J Cell Biol Article The unicellular organism, Noctiluca, has been examined with the electron microscope. The nucleus is small compared to the very large size of the cell, but the nuclear border has an organization which indicates an active nucleocytoplasmic exchange. Whereas annuli are missing over most parts of the nuclear membrane proper, there are "annulated vesicles" in a layer inside the nuclear membrane. The hypothesis is put forth that nuclear substances move through the annuli into these vesicles, and that the annulated vesicles themselves are transported through the nuclear membrane. The various forms of the annulated vesicles are consistent with this hypothesis. An implication of this postulate is the synthesis of annulated membranes inside a closed nucleus which are physically separate from the endoplasmic reticulum. The chromosomes are in a state resembling prophase chromosomes and are surrounded by granular masses. Only a small portion of the entire nuclear volume is occupied by the chromosomes. There are many nucleolus-like bodies. The Rockefeller University Press 1963-10-01 /pmc/articles/PMC2106862/ /pubmed/19866634 Text en Copyright © 1963 by The Rockefeller Institute Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Afzelius, Björn A.
THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane
title THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane
title_full THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane
title_fullStr THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane
title_full_unstemmed THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane
title_short THE NUCLEUS OF NOCTILUCA SCINTILLANS : Aspects of Nucleocytoplasmic Exchanges and the Formation of Nuclear Membrane
title_sort nucleus of noctiluca scintillans : aspects of nucleocytoplasmic exchanges and the formation of nuclear membrane
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2106862/
https://www.ncbi.nlm.nih.gov/pubmed/19866634
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