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.

en·ve·lope

(en'vĕ-lōp), Avoid the mispronunciation ahn'vĕ-lōp.
In anatomy, a structure that encloses or covers.

envelope

(ĕn′və-lōp′, ŏn′-)
n.
Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.

en·ve·lope

(en'vĕ-lōp)
anatomy Any structure that encloses or covers.

envelope

any enclosing structure, such as a membrane or skin. In bacteria, it is the part of the cell enclosing the cytoplasm, i.e. the cytoplasmic membrane cell wall and capsule. In VIRUSES, it is the outer lipid-containing layer of some virions.

en·ve·lope

(en'vĕ-lōp)
In anatomy, a structure that encloses or covers.
References in periodicals archive ?
This approach, in combination with the carrots and sticks, should ensure that San Jose continues to provide high quality service to its residents and that the city continues to push the envelope on diversion.
Here are some high-performance cartridges of the future which we might expect to see as shooters push the envelope of ballistic performance.
And the Iranian Ambassador said negotiations should "not be considered as an opportunity by certain quarters in the Western world to push the envelope on areas where there is cultural sensitivity, ideological sensitivity, ethical sensitivity" (from same Associated Press story).
I wrote a Talk story in the form of an expense account." It was this willingness to push the envelope with the structure, style, and content of the Talk stories that first gained Kincaid attention in literary circles.
"We needed a group that wouldn't get bogged down, that was free to push the envelope" Lombardi says.
In Argentina, which has one of the most liberal investment regimes for pension administrators, fund managers continue to push the envelope. AFJPs, as the funds are known, have clashed with their superintendent over severe restrictions on putting money in local mutual funds.
cartoons where it plays on two levels." Director Peter Segal said, "With comedy you're always trying to push the envelope. We wanted to push the envelope to the edge of the PG-13 cliff."
Until recently, laptops powered by Intel chips hit the wall at a top speed of 150MHz, while high-end desktop PCs continue to push the envelope, achieving speeds of 300MHz.
Now, researchers have discovered that insects push the envelope every day, creating extra lift by finessing the laws of aerodynamics.
Now, American Express appears to be trying to push the envelope a little further by letting its CPAs issue reports on financial statements, and preliminary results of American Express's foray are still unclear.