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 ?
However, in Pallavacinia (Metzeriidae I) the spindle originates from nuclear envelope associated prophase microtubule systems and is more like that of leafy liverworts.
39h) that appear at equidistant points along the nuclear envelope nucleate microtubules of the QMS (Fig.
The nuclear envelope, muscular dystrophy and gene expression.
If the structure is made of several bilayers lying parallel to the PMS, Landh proposes, it might even serve as a membrane-based "communications center," where membranes coming from the endoplasmic reticulum or the nuclear envelope or the cell surface can interact with each other.
Landh has found cubic membranes in the smooth and rough endoplasmic reticulum, the part of the cell that synthesizes fats (lipids) and some proteins; in the inner and outer nuclear envelopes, the membranes that surround the cell's DNA; in the inner mitochondrial membrane where much of the cell's energy is produced; in lysosomes, small membrane-bound sacs that digest proteins and lipids; and in the plasma membrane, the outer boundary of the cell that controls the transport of molecules in and out.
Eight leading scientists will make presentations on meiotic versus mitotic chromatin structure and function, transcriptional repression prior to MET, genomic imprinting, chromatin structure and gene expression, the relationship between DNA replication and transcription, the role of the nuclear envelope, and somatic versus embryonic cell cycle.

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