cell membrane

Definitions

  • WordNet 3.6
    • n cell membrane a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell "all cells have a cell membrane"
    • ***

Usage

In literature:

The nuclear membrane then disappears and fibrillar cell-plasma or cytoplasm invades the nuclear area.
"Darwin and Modern Science" by A.C. Seward and Others
The epithelial cell membrane allows the water of the blood with certain salts in solution to pass, but rejects the albumen.
"A Practical Physiology" by Albert F. Blaisdell
By the segmentation of the fertilized egg, now invested by cell-membrane, the embryo-plant arises.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1" by Various
On the outside of the elastic membrane, just beneath the ectoderm, is a plexus or cobweb of nervous cells and fibrils.
"The Whence and the Whither of Man" by John Mason Tyler
MUCOGEN (MUCOUS MEMBRANE CELL PRODUCER).
"Valere Aude" by Louis Dechmann
The cell membrane of this class contains no pure cellulose, but a modification called fungus cellulose.
"Scientific American Supplement, No. 623, December 10, 1887" by Various
So long as the pavement-cells of our mucous membranes are healthy, they can keep them out indefinitely.
"Preventable Diseases" by Woods Hutchinson
Peripodal membrane: the cell layer surrounding the peripodal cavities.
"Explanation of Terms Used in Entomology" by John. B. Smith
The vegetable cell, on the contrary, is surrounded by a membrane of cellulose, which condemns it to immobility.
"Creative Evolution" by Henri Bergson
All strains show involution form, exhibiting vacuoles, and often show empty cell membranes.
"The Bacillus of Long Life" by Loudon Douglas
Generally speaking, most enzymes are colloidal in form and, hence, do not diffuse through membranes such as the cell-walls.
"The Chemistry of Plant Life" by Roscoe Wilfred Thatcher
We may also obtain cells with cytoplasm filling the whole of the cellular cavity or separated from the cell-membrane.
"The Mechanism of Life" by Stéphane Leduc
This membrane has a peculiar kind of cells upon its outer surface.
"A Treatise on Physiology and Hygiene" by Joseph Chrisman Hutchison
The most numerous have the appearance of mucous cells, resembling the goblet cells of columnar mucous membranes.
"Handbook of Medical Entomology" by William Albert Riley
In all species the membrane is composed of flattened cells of irregular shape fitted together like the pieces of a puzzle-picture.
"Freshwater Sponges, Hydroids & Polyzoa" by Nelson Annandale
They line their cells with silky membrane and build mud partitions.
"Great Hike" by Alan Douglas
In old membranes the cells are destroyed by granular degeneration and general maceration.
"A System of Practical Medicine by American Authors, Vol. I" by Various
It must be changed to a soluble form, for otherwise it could not pass through the delicate cell membranes.
"A Civic Biology" by George William Hunter
The outer covering, or cell membrane, of the globular egg remains undivided.
"The History of Creation, Vol. I (of 2)" by Ernst Haeckel
These small cells look very like the smaller stomata of endothelial membranes, but are shewn to be cells by possessing a nucleus.
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour
***

In news:

Instead, these cells retain robust PDK1 activation and membrane localization and exhibit dependency on the PDK1 substrate SGK3 SGK3 undergoes PI3K- and PDK1-dependent activation in PIK3CA mutant cancer cells.
Cell membranes capture electrical energy to amplify sound.
Proton exchange membrane (PEM) fuel cells offer chlor-alkali makers the opportunity to extract value from byproduct hydrogen without any compression or transportation costs.
Unlike most other organisms, coral eggs produce embryos that are not surrounded by a protective membrane, which makes them vulnerable to separation into component cells by even mild turbulence.
Cholesterol is a member of the sterol group of lipids, and it must be present in the membrane of every cell in the body.
ENrG Inc recently announced that it has entered into a licensing agreement with Corning Inc that enables ENrG to produce thin ceramic membranes with unique properties for solid oxide fuel cells (SOFCs).
Rab25 proteins bind integrins in the cell membrane and shuttle them to lysosomes.
Such membranes can also be found within cells, for example encapsulating the nucleus, and even surrounding many kinds of viruses.
In the meantime, the supplement SAMe has more research behind it SAMe helps to maintain cell membranes .
Robert Lefkowitz and Brian Kobilka identified the form and function of G-protein-coupled receptors , proteins located on the surface of cells, which allow the transmission of information across the cell membrane.
"This is the cell membrane, this is the cytoplasm, this is the nucleus, this is a food vacuole where food is digested, this is a waste product vacuole, these are pseudopods that move around and trap food".
Whole-cell patch clamping involves bringing a hollow glass pipette in contact with the cell membrane of a neuron Sputnik Animation and MIT McGovern Institute.
The researchers stretched Nafion, a polymer electrolyte membrane, or PEM, commonly used in fuel cells and increased the speed at which it selectively filters substances from ions and water.
After each type of milk had been "digested," they tested for levels of free fatty acids, which have been shown in adult stomachs to damage cell membranes.
Torrance based Toyota Motor Sales USA flipped the switch on their 1.1 megawatt Proton Exchange membrane fuel cell generator, the largest of its kind.
***

In science:

One can form with them tunable or “active” filters, simulating, as it were, the action of the cell membrane.
Amphiphilic Membranes
Figure 12: Freeze-fracture of a cell membrane from an onion root tip.
Amphiphilic Membranes
The center area shows the fracture face of the cell membrane (plasmalemma, PL).
Amphiphilic Membranes
The fluidity of biological membranes can be exhibited by fluorescence photobleaching recovery experiments in intact cells.
Amphiphilic Membranes
We are currently attempting to gain some estimate of the amount of information carried by phonons across cell membranes, but there is unfortunately very little data available on the phonon spectrum of living tissue.
Comment on Book Review of `Quantum Evolution' (Johnjoe McFadden) by Mathew J. Donald
Then, experimental fluorescence recoveries recorded in living cells on a membrane-bound protein have been analysed using three different models : normal Brownian diffusion, Brownian diffusion with an immobile fraction and anomalous diffusion due to long waiting times.
Membrane bound protein diffusion viewed by fluorescence recovery after bleaching experiments : models analysis
During this last decade, it has become apparent that cell surface membranes are far from being homogeneous mixture of their lipid and protein components.
Membrane bound protein diffusion viewed by fluorescence recovery after bleaching experiments : models analysis
Numerous studies on transmembrane proteins by means of single particle tracking (SPT) or fluorescence recovery after photobleaching (FRAP) has shown the existence of micrometer and submicrometer size domains on both model membrane and living cells [2, 3, 4, 5].
Membrane bound protein diffusion viewed by fluorescence recovery after bleaching experiments : models analysis
Therefore, in this letter, diffusion of an intracellular membrane-bound protein domain (pleckstrin homology domain) has been analysed inside living cells by FRAP experiments.
Membrane bound protein diffusion viewed by fluorescence recovery after bleaching experiments : models analysis
The thickness of a tensionless membrane, however, can be measured by simulating a bilayer patch that spans the periodic boundary conditions of the simulation cell in only one direction but exhibits a free edge in the other direction.
Biological and synthetic membranes: What can be learned from a coarse-grained description?
Sphingolipid-cholesterol rafts diffuse as small entities in the plasma membrane of mammalian cells. J.
Biological and synthetic membranes: What can be learned from a coarse-grained description?
Mesoscopic simulation of cell membrane damage, morphology chance and rupture by nonionic surfactants.
Biological and synthetic membranes: What can be learned from a coarse-grained description?
Evolution of lipidic structures during model membrane fusion and the relation of this process to cell membrane fusion.
Biological and synthetic membranes: What can be learned from a coarse-grained description?
Simulations of transient membrane behavior in celles sub jected to a high-intensity ultrashort electric pulse.
Biological and synthetic membranes: What can be learned from a coarse-grained description?
Phase segregation on different length scales in a model cell membrane system. J.
Biological and synthetic membranes: What can be learned from a coarse-grained description?
***