cell wall

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wall

 [wawl]
a structure bounding or limiting a space or a definitive mass of material; called also paries.
cell wall a rigid structure that lies just outside of and is joined to the plasma membrane of plant cells and most prokaryotic cells, which protects the cell and maintains its shape.
chest wall the structures bordering the thorax that move during breathing, including the rib cage, diaphragm, and abdomen.

cell wall

1. the outer layer or membrane of some animal and plant cells; in the latter, it is mainly cellulose.
2. in bacteria, the rigid structure, usually containing a peptidoglycan layer, that provides osmotic protection and defines bacterial shape and staining properties.

cell wall

n.
The rigid outermost cell layer found in plants and certain algae, bacteria, and fungi but absent from animal cells.

cell wall

the structure that covers and protects the plasma membrane in some kinds of cells, such as certain bacteria and all fungi and plant cells. The cell walls of plant cells are composed of cellulose.

cell wall

(sel wawl)
The outer layer or membrane of some animal and plant cells; in the latter, it is mainly cellulose.

cell wall

a thick, rigid coat formed outside the CELL MEMBRANE of plants, fungi and most bacteria. The cell wall is responsible for the shape of the organism and for protecting internal parts of the cell from damage. The plant cell wall is composed mainly of CELLULOSE secreted by the protoplasm of the cell. Structurally it consists of cellulose fibres embedded in a matrix of pectin and other polysaccharides, rather like fibreglass. Each fibre is built up from cellulose molecules which form strands called micelles. These are grouped into microfibrils, several hundred of which form a fibre. Older cells may also produce a secondary wall inside the primary wall which is thicker and contains LIGNIN for extra strength. Such cells often die after producing the secondary wall, e.g. XYLEM vessel cells.

The cell wall of BACTERIA is made of PEPTIDOGLYCAN, either alone or combined with other substances, and is used to differentiate the major types of bacteria: Gram-positive and Gram-negative (see GRAM'S STAIN). In Gram-positive bacteria, the wall generally consists of many layers of peptidoglycan, giving a very rigid structure. TEICHOIC ACIDS are also present. In Gram-negative bacteria there is a thin layer of peptidoglycan and an outer membrane. The peptidoglycan is attached to LIPOPROTEINS in the outer membrane. This membrane acts as a barrier to some ANTIBIOTICS, ENZYMES and so on; however, certain substances, such as nutrients, pass through. Part of the permeability of the membrane is due to PORINS. The ARCHAEA either lack cell walls or have unusual walls without peptidoglycan. In FUNGI a key component of most cell walls is CHITIN. The cell walls of YEASTS contain glucan and mannan. There may be additional layers, such as a CAPSULE, outside the cell wall.

cell wall

bimolecular lipid membrane that envelops the cell; contains receptors and pores through which small molecules can diffuse and larger molecules can be transported in and out of the cell

cell wall

(sel wawl)
1. Outer layer or membrane of some animal and plant cells.
2. In bacteria, the rigid structure that provides osmotic protection and defines bacterial shape and staining properties.

wall

a structure bounding or limiting a space or a definitive mass of material.

abdominal wall
see abdominal wall.
cell wall
a rigid structure that lies just outside of and is joined to the plasma membrane of plant cells and most prokaryotic cells, which protects the cell and maintains its shape.
wall chart
see calendar charts, shed sheet.
intestinal wall
composed of serosa, muscular tunic, the submucosa containing intestinal submucosal glands, and the mucosa of lining cells, goblet and enterochromaffin cells.
References in periodicals archive ?
To find out more about the Australian Research Council Centre of Excellence in Plant Cell Walls visit: http://www.
Nano-indentation was used to determine elastic modulus and hardness of the cell walls adjacent to the bondline, with complementary scanning electron microscopy--energy dispersive spectroscopy (SEM-EDS) used to measure concentration of the chlorinated glycerin analogs in these same cells.
Develop methodologies and instrumentation to determine cell wall morphology and measure properties at the nanoscale.
Undoubtedly, coating penetration into fine cracks in the surface layer of wood cell walls enhances the coating anchorage afforded by the penetration of a coating into larger voids, such as cell lumina.
1 millimeter of a microbe, an asymmetrical expansion is triggered--the bubble shoots out a jet that fractures the cell wall.
Cell wall damage from ice crystals is responsible for the loss of flavor, texture and aroma of frozen products.
One of the government's main pieces of evidence supposedly indicating Trentadue's intent to commit suicide was a "suicide note" he allegedly had scrawled on the cell wall with a pencil.
Involvement of malate, monophenols, and the superoxide radical in hydrogen peroxide formation by isolated cell walls from horseradish (Armoracia lapathifolia Gilib.
Mycelia are used frequently as the source of fungal cell components because hyphal cell walls are often weaker than spore cell walls (Lalithakumari 2000).
Hoping to breed plants whose cell walls are more easily degraded, Casler and Jung will soon begin crossing promising grass lines.
Relationship between structural development of cell walls and degradation of tissues in maize stems.