cell wall

(redirected from Plant cell wall)
Also found in: Dictionary, Thesaurus, Acronyms, Encyclopedia.
Related to Plant cell wall: cellulose

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 ?
Because the structure of plant cell walls in fibrous feedstuffs with higher ferulic acid and p-coumaric acid contents (e.
Dissection of Plant Cell Walls by High-throughput Methods (Staffan Persson, Iben Srensen, Isabel Moller, William Willats and Markus Pauly)
The Australian Nuclear Science and Technology Organisation (ANSTO) is partnering with the ARC Centre of Excellence in Plant Cell Walls to apply cutting edge neutron and X-ray scattering methods to investigate the structure of cell walls and key components, in particular cellulose and how other polymers interact with cellulose.
There is also lab work--for example, refining the processes for busting apart plant cell walls to release the useful sugars inside.
The scientists will use infrared spectroscopy to identify and characterize mutant genes that affect plant cell wall architecture.
Even though dairy cows are impressive plant-to-energy converters, they can't digest especially fibrous feed portions toughened up by lignin, the cementing agent that holds plant cell walls together.
Improved digestibility of livestock feed, hardier crops, and higher yield of biofuels may result from information that Purdue University researchers are learning about the sorghum gene that controls plant cell wall hardness.
This Pioneer research has also opened the way to better understand plant cell wall synthesis.
They are responsible for the degradation of plant cell walls and provide a fast and effective means of releasing important fermentable sugars from plant matter.
Plant cell walls are made of cellulose and hemicellulose organized into long, rodlike units called microfibrils that are the building blocks of the cell wall.
Buxton is part of a group of ARS researchers focused on understanding the structure and function of plant cell walls.
When processing plant-based biomass, hemicellulose an abundant polysaccharide in plant cell walls must first be degraded to monomeric sugars that can be converted to high-value products such as biofuels.