silkworm


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silkworm,

name for the larvalarva,
independent, immature animal that undergoes a profound change, or metamorphosis, to assume the typical adult form. Larvae occur in almost all of the animal phyla; because most are tiny or microscopic, they are rarely seen. They play diverse roles in the lives of animals.
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 of various species of moths, indigenous to Asia and Africa but now domesticated and raised for silksilk,
fine, horny, translucent, yellowish fiber produced by the silkworm in making its cocoon and covered with sericin, a protein. Many varieties of silk-spinning worms and insects are known, but the silkworm of commerce is the larva of the Bombyx mori,
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 production throughout most of the temperate zone. The culture of silkworms is called sericulture. The various species of silkworms raised today are distinguished by the quality of the silk they produce, the type of leaves on which they feed, and the number of breedings per year. The most widely raised type and the producer of the finest silk is the larva of Bombyx mori, of Asian origin. After centuries of domestication, Bombyx mori is no longer found anywhere in a natural state. The legs of the larvae have degenerated, and the adults do not fly. Hatched from eggs so small that about 35,000 of them weigh only an ounce, these silkworms are immediately quite active and feed voraciously on mulberry leaves. At the end of the larval stage (32 to 38 days after hatching) they are about 3 in. (7.5 cm) long. A mature larva attaches itself to a twig and, with a weaving motion of its head and a slow, circular motion of its body, begins to spin its cocoon (see pupapupa
, name for the third stage in the life of an insect that undergoes complete metamorphosis, i.e., develops from the egg through the larva and the pupa stages to the adult.
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). A moist substance, fibroin, is manufactured in two silk glands located on the underside of the larva's body; mixed with a small amount of wax, it is emitted from an orifice called the spinneret, in the lip of the larva. The fibroin dries quickly in the air, hardening into a half-mile-long thread of silk that makes up the cocoon. The adult moth, with a wingspread of 1.75 in. (4.5 cm), emerges from the cocoon in about two weeks. The moths mate and lay their eggs (several hundred from each female) within a week; the eggs hatch in about ten days. Only enough cocoons to ensure adequate reproduction are allowed to hatch; the rest are unwound after developing for a week, and the silk is processed. The giant silkworms used in some Asian and South American sericulture are the larvae of the closely related saturnid moths (family Saturniidae). They include the tussah moth (Antherala pernyi), the producer of tussah silk. The ailanthus moth (Samia walkeri), a large, olive-green saturnid moth used in China to produce a coarse grade of silk, was imported to the United States along with its food plant, the Chinese ailanthus tree, as the basis of an industry that never materialized; the moth has been firmly established in the New York City area since 1861. Diseases of silkworms have occasioned important scientific work. When Pasteur saved the French silk industry from destruction by pébrine, a protozoan disease of insects, in the mid-18th cent., he also made an important contribution to the germ theory of disease. The common silkworm, Bombyx mori, is classified in the phylum ArthropodaArthropoda
[Gr.,=jointed feet], largest and most diverse animal phylum. The arthropods include crustaceans, insects, centipedes, millipedes, spiders, scorpions, and the extinct trilobites.
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, class Insecta, order Lepidoptera, family Bombycidae.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

silkworm

[′silk‚wərm]
(invertebrate zoology)
The larva of various moths, especially Bombyx mori, that produces a large amount of silk for building its cocoon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

silkworm

1. the larva of the Chinese moth Bombyx mori, that feeds on the leaves of the mulberry tree: widely cultivated as a source of silk
2. any of various similar or related larvae
3. silkworm moth the moth of any of these larvae
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Some 30.19 tons of silkworms were harvested in Zardab, 22.82 tons - in Fuzuli, 13.57 tons - in Balakan, 5.72 tons - in Zagatala, 5.64 tons - in Kurdamir and 5.39 tons - in Shaki regions.
Srey Chansophea, a representative of the RUPP, said Cambodia used to have strong traditions of planting mulberry trees, breeding silkworms and weaving loom.
Moalla attributed the diseases affect the silkworm to negligence of the breeders mainly.
Chinese scientists said they used these plants and silkworms because the plants will provide the silkworms with oxygen, while the silkworms will give them carbon dioxide and nutrients through their waste, (https://www.telegraph.co.uk/news/2018/04/13/china-plans-grow-flowers-silkworms-dark-side-moon/) The Telegraph has learned.
M2 EQUITYBITES-November 21, 2018-Kraig Biocraft Laboratories, IoB-VAST and VSRC to import and rear silkworms in Vietnam
Silkworm which can be produced as co-product of the silk industry, is a caterpillar of moth butterfly (Bombyx Mori) whose cocoon is used for silk production.
The Chinese mulberry trees are expected to produce leaves to feed silkworms in the next two years.
Owino, 39, gets the Bombyx mori silkworm eggs from National Sericulture Research Centre (NSRC) in Thika.The eggs come stuck by glue on a paper.
Through the implementation of such schemes and projects, and providing integrated training to the farmers on technology, scientific way of hatching and rearing silkworms will improve the quality silk production in the state.
Since limited research concern the effect of popcorn disease to the silkworm and the mechanism of the Popcorn disease infecting the mulberry.
Actually, the plot for Silkworm predated the plot for Cuckoo's Calling (the first Strike book).
Some natural polymers such as fibroin silkworm, collagen, elastin, fibronectin, chitosan, alginate, cellulose and hyaluronic acid have been successfully used as scaffold materials for tissue engineering (Dunne et al., 2014).