Eukaryotic organisms such as algae, fungi and higher plants, in
multilayered cell walls consist mostly or
cellulose and chitin. Cellulose and chitin are polysaccharides
, ie they consist of many related molecules of sugar. Cellulose
glucose polymer containing only carbon, hydrogen and oxygen, while the chitin polymer
N-acetylglucosamine, sugar, containing nitrogen as well. Both cellulose and chitin are linear, unbranched polymers th
corresponding sugars, and several dozen of these polymers are collected in
large crystal type of cable is called mikrofibryl that coil around the cell
. Mikrofibryl cellulose form a scaffolding all walls of plant cells. At least two types
primary walls among species of flowering plants
(angiosperms). In type I walls
and some monocots mikrofibryl tied together sugar strattera side effects
called xyloglucans, and is it embedded in gel
pectin, another type of polysaccharide. Pectins install more
walls of physical characters, such as electric charge, density, porosity
,
enzymes and proteins and distribution from cell to cell adhesions.
Pectins used for commercial purposes thicken jellies and jams. Type II
walls of cereals and other monocots relatives cable >> << mikrofibryl with various sugars and relatively poor pectin. The hardness of the wood comes from
lignin, which is impregnated between mikrofibryl cellulose. Lignin is a phenolic compounds
, chemically related to benzene. Cell walls of fungi varied among taxonomic groups, but most contain chitin
mikrofibryl embedded in a matrix of polysaccharides and
covered easily cover the additional molecules combining sugars and peptides
(amino acid chains). However, the cell walls of Oomycetes
contain cellulose rather than chitin. Different groups of fungi can be
differ in part on the composition of their cell wall components. Cellulose is a significant part of the framework mikrofibrylyarnoyi
algae, although some contain other polysaccharides as well. These
mikrofibrylyarnoyi network embedded in a thick gel polysaccharides
huge variety. Three classes of algae, Chlorophyceae
(green), Rhodophyceae (red), and Phaeophyceae (brown) can be
differ somewhat depending on their constituent polysaccharides.
Alginic acid and fucans are in brown algae, while
agarose and carrageenan are predominantly in the red algae. Some of qi
polysaccharides used as thickening and stabilizing agents in various
food. .
No comments:
Post a Comment