nuclear envelope


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envelope

 [en´vĕ-lōp]
1. an encompassing structure or membrane.
2. in virology, the outer lipoprotein coat of a large virus, surrounding the capsid and usually furnished, at least partially, by the host cell. Called also peplos.
3. in bacteriology, the cell wall and the plasma membrane considered together.
nuclear envelope the condensed double layer of lipids and proteins enclosing the cell nucleus and separating it from the cytoplasm; its two concentric membranes, inner and outer, are separated by a perinuclear space.

nu·cle·ar en·ve·lope

the double membrane at the boundary of the nucleoplasm; it has regularly spaced pores covered by a disclike nuclear pore complex and a space or cisterna about 150 Ǻ wide between the two membranes; the outer membrane is continuous at intervals with the rough endoplasmic reticulum.

nuclear envelope

nuclear envelope

a double membrane that surrounds the nucleus of a eukaryotic cell. Also called karyotheca.

nu·cle·ar en·vel·ope

(nū'klē-ăr en'vĕ-lōp)
The double membrane at the boundary of the nucleoplasm; it has regularly spaced pores covered by a disclike nuclear pore complex and a space or cisterna about 150 Å wide between the two layers; the outer membrane is continuous at intervals with the endoplasmic reticulum.
Synonym(s): nuclear membrane.

nuclear envelope

The double membrane, with perforations (pores), surrounding a cell nucleus. The outer membrane extends into the endoplasmic reticulum. The pores allow transport of macromolecules in both directions.

envelope

an encompassing structure or membrane. In virology, a bilayer lipoprotein membrane with glycoprotein spikes surrounding the nucleocapsid and usually furnished, at least partially, by the host cell. In bacteriology, the cell wall and the plasma membrane considered together.

nuclear envelope
the condensed double layer of lipids and proteins enclosing the cell nucleus and separating it from the cytoplasm; its two concentric membranes, inner and outer, are separated by a perinuclear space.
References in periodicals archive ?
When DAG was depleted by either DGK or the phosphoinositide 5-phosphatase SKIP, nuclear envelope formation was inhibited and the ER was reorganized into multilamellar sheets.
gamma]-tubulin remains in association with nuclear envelopes and punctuate staining reappears on the plastid surfaces (Fig.
Nuclear lamins A and B1: Different pathways of assembly during nuclear envelope formation in living cells.
28a-c), microtubules radiate from numerous sites around the nuclear envelope where [gamma]-tubulin is concentrated (Fig.
In higher vertebrates, a linkage between the nuclear envelope and several microtubules is evident (Russell et al.
In these proceedings from the January 2004 symposium, researchers describe their work in such areas as the nuclear envelope/lamina complex, interactions between chromatin and the nuclear lamins, and the functions of proteins associated with the inner nuclear envelope membrane.
This PA is a new initiative to support research to understand how mutations in the gene for lamin A/C affect nuclear structure, thus leading to bothdysfunction of the nuclear envelope, and depending on the mutation, Hutchinson-Gilford syndrome in humans (Eriksson et al.
The 42 papers selected cover the following themes: genome organization and replication; transcription; nuclear envelope and nuclear import; mitosis and cell cycle control; cell membrane and extracellular matrix; protein synthesis and membrane traffic; and cytoskeleton.
We can find specific chromosome regions clearly stuck to the nuclear envelope," concludes Sedat.
Accompanied by live cell imaging in mammalian tissue culture cells, the proposed approach will not only facilitate the elucidation of the factors involved in chromatin decondensation, but will also provide insight into how this process is integrated into mitotic exit and nuclear reformation and linked to other concomitant processes such as nuclear envelope assembly or nuclear body formation.
When you get into mitosis, everything changes-the nuclear envelope breaks down, the chromosomes condense, the spindle forms," says Jeremy Hyams of University College London.

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