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 ?
Like all proteins, pectate lyase C consists of a long string of amino acids with its own characteristic sequence.
Purification and characterization of extracellular pectate lyase from Bacillus subtilis.
The gram negative bacterial isolates obtained were grown on specialized media like Pseudomonas isolation agar specific for Pseudomonas and crystal violet pectate media specific for Erwinia.
Presence of high levels of Ca and Mg contribute to the formation of insoluble pectates in the intercellular spaces of the cotyledon which hinder rapid movement of water in the seed during cooking or soaking.
The enzymes involved in the breakdown of pectin include pectate lyase, polygalacturonase and pectinesterase.
Their findings indicate that calcium pectate appears responsible for most, if not all, of the fiber's binding of bile acids--and therefore for the vegetable's cholesterol-lowering ability.
Somogyi and Romani, 1964) also described that decrease in firmness was due to decrease in protopectin content and increase in pectin and pectate fractions of the fruit.
Calcium commonly exists as calcium pectates or pectin, a structural component in cell walls (Bockheim and Jepsen 1991), but degradation of cellulose and hemicellulose releases Ca.
In fact, calcium serves vital physiological functions in plants, such as the organization of cell walls by calcium pectates, stabilization of membranes, pollen germination, pollen tube growth and elongation of the roots (Ge, Tian, & Russel, 2007; Gilliham et al.
Salts below 5% degree of esterification are called pectates and the insoluble acid form is the pectic acid [32].
Imports of Vegetable Saps and Extracts, Pectic Substances, Pectinates and Pectates has grew month on month basis by 14.