Silk Gland


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silk gland

[′silk ‚gland]
(invertebrate zoology)
A gland in certain insects which secretes a viscous fluid in the form of filaments known as silk; it is a salivary gland in insects and an abdominal gland in spiders.

Silk Gland

 

in certain arthropods, an organ that elaborates a secretion that on exposure to air hardens into silk threads. Silk glands are especially developed in spiders. They are located in the posterior part of the abdomen and open through numerous tiny tubules at the ends of the six colliculi. Spiders have several types of silk glands: they secrete silk for producing egg cocoons, for arranging various parts of a snare, and for forming a sticky secretion with which the spider traps its prey. Silk glands are also found in Tetranychoidea, Pseudoscorpionidea, and Embioptera.

References in periodicals archive ?
Voight's team also examined gene transcripts from different orb-weaver silk glands and in each case found transcripts belonging to more than one spidroin class, suggesting that these glands are not strictly specialized for producing one type of silk.
Since the silk gland forms the basic organ for cocoon formation and silk production (Krishnaswamy, 1978), probably the synthetic activities of the protein metabolism might have been accelerated through anabolic process by the hormonal treatment, (Bharathi et al.
The araneoids have six functional spinnerets and six different kinds of silk glands each producing one to three types of protein (Kovoor 1987; Coddington 1989).
According to Dr Sutherland, numerous efforts have been made to express other invertebrate silks in transgenic systems, but the complicated structure of the silk genes in other organisms means that producing silk outside silk glands is very difficult.
The silkworm larvae from all the five instars, excreta leaves and silk glands were used for AAS analysis.
The study of feeding effects with various verities on silk glands weight showed that silk glands weight increased in larvae fed on Kokosa at early 5th stage but local varieties had better condition at the end stage, Of course this increase was not significant and cocoon shell weight and males and females shell ratio did not increased.
Since several types of silk glands are remodeled during a molt, they may not be fully operative in the days immediately after the molt (Townley et al.
The silk starts out as a liquid produced by the spider's silk glands.
The spider weaves its golden-colored web from its spinneret, an organ that produces threads of silk from the secretion of silk glands.
Tissue glycoproteins of the gut diverticula and the ducts of silk glands were resistant to diastase digestion and required periodic acid hydrolysis to localize reaction products with the Schiff reagent for aldehydes.
This, says Viney, indicates that the secretions retain a normal fluid structure while inside the silk glands, but begin to change into a liquid crystal as they exit.