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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Wolf spiders have four types of silk glands: piriform, ampullate, aciniform and tubuliform (Richter 1970).
The stable protein concentration was maintained at pH between 5.0 and 6.5 that might be associated with the spinning process (decrease from 6.9 to 4.8 along the path) in the silk glands [38].
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.
Another discovery made by the team was that of 649 genes that are likely not spidroins but were highly expressed in silk glands of the orb-weaver.
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., 1986).
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).
Aggregate silk gland secretions of araneoid spiders.
"We already knew that honeybee silk fibres could be hand-drawn from the contents of the silk gland so used this knowledge to hand-draw fibres from a sufficiently concentrated and viscous mixture of the recombinant silk proteins," she added.
"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.
With one longitudinal cut on the dorsal surface the larvae were cut open and their silk glands were isolated in 9% NaCl.