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ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE
Oocytes of four species of ascidians were examined with the electron microscope. Prior to fixation, oocytes were subjected to centrifugal forces of 10–15,000 g for 5–10 min and were compared with uncentrifuged oocytes. Intranuclear annulate lamellae (IAL) are distributed uniformly around the periphe...
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
1968
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2107404/ https://www.ncbi.nlm.nih.gov/pubmed/5656403 |
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author | Everingham, John W. |
author_facet | Everingham, John W. |
author_sort | Everingham, John W. |
collection | PubMed |
description | Oocytes of four species of ascidians were examined with the electron microscope. Prior to fixation, oocytes were subjected to centrifugal forces of 10–15,000 g for 5–10 min and were compared with uncentrifuged oocytes. Intranuclear annulate lamellae (IAL) are distributed uniformly around the periphery of the nucleus of the uncentrifuged oocyte. Centrifugation produces a marked flattening of the oocyte nucleus, migration of nucleoli to the centrifugal end, and often a condensation of the nucleoplasm at the centrifugal end. In contrast, the distribution of IAL is unchanged by centrifugation. Furthermore, numerous IAL profiles appear to be touching the nuclear envelope, and, in a few of these, direct continuity of the IAL with the nuclear envelope is demonstrated. |
format | Text |
id | pubmed-2107404 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1968 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21074042008-05-01 ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE Everingham, John W. J Cell Biol Article Oocytes of four species of ascidians were examined with the electron microscope. Prior to fixation, oocytes were subjected to centrifugal forces of 10–15,000 g for 5–10 min and were compared with uncentrifuged oocytes. Intranuclear annulate lamellae (IAL) are distributed uniformly around the periphery of the nucleus of the uncentrifuged oocyte. Centrifugation produces a marked flattening of the oocyte nucleus, migration of nucleoli to the centrifugal end, and often a condensation of the nucleoplasm at the centrifugal end. In contrast, the distribution of IAL is unchanged by centrifugation. Furthermore, numerous IAL profiles appear to be touching the nuclear envelope, and, in a few of these, direct continuity of the IAL with the nuclear envelope is demonstrated. The Rockefeller University Press 1968-05-01 /pmc/articles/PMC2107404/ /pubmed/5656403 Text en 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 Everingham, John W. ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE |
title | ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE |
title_full | ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE |
title_fullStr | ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE |
title_full_unstemmed | ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE |
title_short | ATTACHMENT OF INTRANUCLEAR ANNULATE LAMELLAE TO THE NUCLEAR ENVELOPE |
title_sort | attachment of intranuclear annulate lamellae to the nuclear envelope |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2107404/ https://www.ncbi.nlm.nih.gov/pubmed/5656403 |
work_keys_str_mv | AT everinghamjohnw attachmentofintranuclearannulatelamellaetothenuclearenvelope |