Chitin forms less than one-half by weight of the integument, but it is so coherent and uniformly distributed that when isolated by chemical reagents, and even when cautiously calcined, it retains its original organised form.
Chitin kept for a year under water partially dissolved, turned into a slimy mass, and gave off a peculiar smell.
The chemical stability of chitin is so remarkable that we might well expect it to accumulate like the inorganic constituents of animal skeletons, and form permanent deposits.
The colouring-matter of the chitin of the Cockroach, which is amber-yellow in thin sheets and blackish-brown in dense masses, is particularly stable and difficult of removal.
Chitin is not peculiar to Insects, nor even to Arthropoda.
Basch set out with a conviction that where a chitinous lining is present, the epithelium of the alimentary canal secretes chitin only, and that proper digestive juices are only elaborated in the chylific stomach, or in the salivary glands.
The minute proportion of nitrogen in its composition may explain the complete disappearance of chitin in nature.
Chitin may also stiffen the larger tendons, internal ridges and partitions, and the lining membrane of extensive internal cavities, such as the alimentary canal, and the air-tubes of Insects.
All these sense-organs are formed on the same plan, in that they possess a fine chitinous tubule passing through the layers of chitin into the underlying hypodermal and nervous tissues, which terminates on the surface in a pore.
If the flabellum be stained with methylene blue and acid fuchsin, then all the canaliculi in the chitin show up as fine red lines, and present the appearance given in Fig.
It is certainly not bone, for there are no bone-corpuscles; it is a very regular laminated structure resembling in appearance chitin rather than anything else.
Such a difference does not seem to me either unlikely or unreasonable, seeing that cilia are found instead of chitin in the intestine of the primitive arthropod Peripatus.
The large tubes in the chitin alter in shape according to their position.
The whole surface of the organ on the appendage is slightly bulged in the living condition, and the chitin is markedly softer here than in the surrounding part of the limb.
In the male, he says that the {207}epithelium of the uterus masculinus and its processes is extraordinarily elongated, the chitin covering being thick.
They consist of a large tube which passes through all the layers of the chitin except the thin homogeneous most external layer.
These teeth are very strong, with sharp points, and in structure each has the appearance of a hollow cone of chitin placed over another cone or papilla.
The chitin of the shell is covered with silicious particles of diverse size.
On those parts of the body which are to the rear of the head the chitin forms a series of plates or shields which overlap one another somewhat like the tiles of a house.
One is composed of a sheet of chitin with a number of slits and teeth and resembles a true comb.
Chitin is a very peculiar and durable substance which resists boiling in acids or alkalies.
The chitin which forms the external skeleton of a flea is secreted by an outer layer of cells on the insect’s body.
The separation of the heavier plates of chitin by grooves of delicate cuticle results in the hinging or jointing of the body and its appendages, and the consequent flexing and extending of the jointed pieces.
Chitin is not exclusively an ectodermal product, but occurs also in cartilaginous skeletal plates of mesoblastic origin (connective tissue).
This chitin diaphragm picks up the microwave like our ears pick up sound.
In their anthers they've got a chitin cell diaphragm.
In the so-called horny sponges it resembles the chitin in which insects and other arthropods are clothed.
Its head is probably too thickly coated with chitin to excite their discharge.
You see, the chitin acts both as armor-plate for the soft parts and also as a firm support to the many muscles.
From end to end of the tube is a fine thread of chitin twisted in a close spiral like a spring.
By pulling on the bits of chitin to which the muscles are attached, the muscles (if they have not been cut) can be stretched to the length of three-quarters of an inch.
The chitin armor of the whole body is specially heavy and strong, affording a great protection to the insect.
There is no chitin in the skin between the segments.
The minerals and gases that compose them let go of each other, as it were, and the chitin is no longer chitin.
Ned thinks the segments of the legs are made of chitin too.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "chitin" in a variety of sentences. We hope that you will now be able to make sentences using this word.
