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Chitin

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chitin
outer, horny covering of insects, crustacea, and so forth
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...


chitin
(Science: cell biology) a cross linked polymer of N acetyl D glucosamine that is the major structural component of arthropod exoskeletons and fungal cell walls. Widely distributed in plants and fungi.

chitinous layer [Gr. chiton - an outer covering, tunic]. A thick, clear layer of an Ascaris egg shell which is composed of chitin and protein and provides a protective coating located between the fertilization membrane and the ascaroside layer.

Chitin Inhibitors
These substances, diflubenzuron (Dimilin«) is an example, interfere with the synthesis of chitin, the material that makes up the insect exoskeleton [see structure]. It seems to have very low toxicity for vertebrates, but is harmful to crustaceans as well as insects.

chitin A polysaccharide contained in fungi; also forms part of the hard outer covering of insects.
chlamydia A sexually transmitted disease caused by a parasitic bacterium that lives inside cells of the reproductive tract.

~
(ky-tin) [Gk. chiton, a tunic, undergarment]
A structural polysaccharide of an amino sugar found in many fungi and in the exoskeletons of all arthropods.
chlorophyll ...

~ /KITE-in/ A structural polysaccharide that is the main component of the exoskeletons of all arthropods and the cell walls of fungi. It is also found in many mollusks, for example, in radulae and in the beaks of cephalopods.

~ - A major component of fungal cell walls that is not found in the cell walls of any other group. Compare with cellulose.
Clamp connection - The structure by which basidiomycota cells divide while retaining their binucleate dikaryotic condition.

~ is similar to cellulose, but its sugar subunits are a modified form of glucose called N -acetyl glucosamine. ~ is the main structural component of fungal cell walls and of animal exoskeletons , such as the shells of insects and crustaceans.

~ is similar to cellulose, except that it contains a nitrogen-containing appendage on each glucose monomer.
Pure ~ is leathery but can be hardened by the addition of calcium carbonate.
~ also provides structural support for the cell walls of many fungi.

~ is also a homopolymer but is made of repeating subunits of N-acetyl-glucosamine, a derivative of glucose which has an amino group (containing nitrogen). We also have some extracellular polysaccharides in our joints called glycosaminoglycans (GAGs). These act as "springs" in our joints.

~ 1.The polysaccharide found in the exoskeleton of arthropods.2. High molecular weight polymer of N-acetyl glucosamine linked by 1,4-b-glycosidic bonds.
chitons (class Polyplacophora)Molluscs that have a shell divided into eight overlapping plates.

a ~ layer (polymer consisting mainly of unbranched chains of N-acetyl-D-glucosamine)
a layer of ╬▓-1,3-glucan
a layer of mannoproteins (mannose-containing glycoproteins) which are heavily glycosylated at the outside of the cell.
Fungus-like protists ...

CHIA : ~ase, acidic
DIP: DNA identification profiling (DIP) platform
EN: Endangered ...

Setules. ~ous projections from copepod maxillipeds that trap food particles
Shelf-slope break. Line marking a change from the gently inclined continental shelf to the much steeper depth gradient of the continental slope ...

In fungi (~)
In plants (cellulose)
NOT in animals
Plasma membrane ...

Exoskeletons are hard outer shells made of ~. While you have an endoskeleton, a crab has a tough shell that protects it from the outside world. Next on the list are the arms and legs. They have jointed appendages. That's what the name arthropod means. jointed leg.

Body expansion is restricted by the caterpillar's ~ous exoskeleton, in particular the inflexible head capsule, so postembryonic development is punctuated by a serious of molts, in which the cuticle is shed and the underlying epidermis is allowed to grow.

They use a very unusual polysaccharide called ~ in their cell walls and this is one of the things that makes them distinct from several other groups. They follow the zygotic life cycle. What does that mean?

Getting back to the carbohydrate table, ~ and cellulose are examples of carbohydrates with structural functions. ~ is the material that makes up the exoskeletons of all arthropods (insects, spiders, lobsters, etc.). Cellulose is what the cell wall in plant cells is made of.

Basic morphology: segmented body (metameric), articulated limbs, ~ous exoskeleton, periodic ecdysis. Type of symmetry: bilateral. Germ layers and coelom: triploblastics, coelomates. Digestive system: complete.

starch polysaccharides such as cellulose, ~s, pectins and inulin etc.
They add bulk to the food and help in digestion process. The fermentation of the dietary fibre occur in the Colon of the digestive tract.
Regular intake of dietary fibres helps to prevent constipation.

It's made up of ~. All vibrios, including Vibrio cholerae, have a very powerful ~ase, an enzyme that breaks down that shell structure, so it plays a role in nature.

Crustacean: Any of a large class (Crustacea) of mostly aquatic mandibulate arthropods that have a ~ous or calcareous and ~ous exoskeleton, a pair of often modified appendages on each segment, and two pairs of antennae; includes lobsters, shrimps, crabs, wood lice, water fleas, ...

Insects, being larger and having a hard, ~ous and therefore impermeable exoskeleton, have a more specialised gas exchange system.
Insects have no transport system so gases need to be transported directly to the respiring tissues.

Eucaryotic, chemoheterothropic microorganisms with cell walls containing ~, cellulose or both. They may be unicelluar or multicellular. Often the terms yeast and mould are used to describe the morphological appearance of them.

Fungi generally have cell walls made from ~ and other materials. The hyphae may be modified to produce highly specialized cellular-scale structures.

Sclerotin an insoluble tanned protein permeating and stiffening the ~ of the cuticle of arthropods
Second messenger a molecule found within a cell which is activated by the binding of a chemical messenger to a receptor on the cell surface membrane ...

Crustacean: Any of a zoological class (Crustacea) that have a ~ous and/or calcareous exoskeleton (lobsters, shrimps, crabs).

cell wall -- Rigid structure deposited outside the cell membrane. Plants are known for their cell walls of cellulose, as are the green algae and certain protists, while fungi have cell walls of ~.
chloroplast -- A chlorophyll-containing plastid found in algal and green plant cells.

Oligosaccharides are found as common form of protein posttranslational modification. Polysaccharides represent an important class of biological polymer. Examples include starch, cellulose and ~.
Nutrition
Refined grain products are rich sources of complex carbohydrates ...

polysaccharide
A large carbohydrate molecule with a chainlike or branched structrure composed of many monosaccharides. Functions in storage (ex. starch, insulin, glycogen) or structre (ex. cellulose, ~.)
Covered in BIOL1020 Lab 2 Biological Molecules & BIOL1020 Lab 4 Cell Energetics I ...

See also: See also: What is the meaning of Organ, Animal, Plant, Biology, Cells?

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