Zur funktionellen Morphologie der Fibroin- und Sericin-sekretion der Seidendr�se von Bombyx mori L.

Voigt, Wolf-Heinrich

doi:10.1007/bf00368247

Cited by 13 publications

(2 citation statements)

References 4 publications

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“…The adhesion of silk threads is substantial for their function in protection, prey capture, locomotion or reproduction, as these always implicate an interaction with substrates or other previously spun threads. In insects and spiders silks have been shown to be coated with an acidic protein (sericin in Bombyx mori 27 ) or a glycoprotein (spider dragline 28 ). The thin draglines of small spiders can stick to smooth surfaces such as glass.…”

Section: Discussionmentioning

confidence: 99%

Spider's super-glue: thread anchors are composite adhesives with synergistic hierarchical organization

et al. 2015

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Silk is a key innovation in spiders, fascinating both biologists and material scientists. However, to fulfil their biological function silken threads must be strongly fastened to substrates or other threads. The majority of modern spiders produce a unique and rather unexplored bio-adhesive: the two-compound pyriform secretion, which is spun into elaborate patterns (so called attachment discs) and used to anchor silken threads to substrates. Strong adhesion is achieved on a high variety of surfaces with a minimum of material consumption. Pyriform threads polymerize under ambient conditions, become functional within less than a second and can remain stable for years. They are biodegradable, biocompatible and highly versatile - the adhesion and the overall toughness of the attachment disc can be controlled by spinneret movements on a macroscopic level (ref. 1: V. Sahni et al., Nat. Commun., 2012, 3, 1106, DOI: 10.1038/ncomms2099). We found that the pyriform thread is a silk fibre that is coated with glue-like cement consisting of aligned nanofibrils, lipid enclosures and a dense, isotropic boundary layer. The threads are spun in a meshwork pattern that promotes stress distribution and crack arresting. Our results demonstrate, that hierarchical organization and fibre embedding may explain the high adhesive strength and flaw tolerance of a structure made by the same, rather simple type of silk glands.

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Section: Discussionmentioning

confidence: 99%

Spider's super-glue: thread anchors are composite adhesives with synergistic hierarchical organization

et al. 2015

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“…These were confined to the basal cytoplasm and were characterised to be responsible for cohesiveness and viscosity of the silk contents in the lumen of the gland. Many workers (Voigt 1965a;Akai and Kobayashi 1966;Beams and Sekhon 1966;Tashiro et al 1968;Akai 1971;Engster 1976) suggested that carbohydrate moieties are added to the protein molecules of silk in later packaging prior to their extrusion into the lumen. They, however, failed to correlate basal localization of carbohydrate substances with their binding to the protein molecules in the apical cytoplasm.…”

Section: T Introductionmentioning

confidence: 99%

Cytochemical changes in the silk gland cells ofPericallia ricini (Lepidoptera: Arctiidae)

Narain¹,

Vishnoi

1983

Proc Ani Sci

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Cytochemical changes involving PAS -positive and metachromatic substances have been studied in the silk gland cells of the moth Pericallia ricini during growth and atrophy. The distinction between the silk-periphery and silk-core on the basisof metachromatic staining has been traced even in the second instar stage for the first time. PAS-reaction differentiates the same in the prepupal stage. The secretion of two silk constituents goes on simultaneously in the gland cells. The conjugation of PAS-positive polysaccharide group to silk protein takes place in the apical cytoplasm of the gland cells. The core silk secretion predominates in the prepupal stage. Reduction in the amount of carbohydrate material in the basal cytoplasm of the silk gland cells from first instar to prepupal stage occurs with their simultaneous concentration in the apical region of the cells. The degree of metachromasia increases progressively in advancing instars.

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Studies on the silk glands of Calpodes ethlius stoll, (Lepidoptera, hesperiidae)

Wiley

Lai-Fook

1974

Journal of Morphology

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A B S T R A C TEach silk gland of Calpodes ethlius consists of five distinct regions: the duct, the green, anterior, middle and posterior regions. Although the gland increases approximately tenfold in length during the larval life, the number of cells remains constant with a concomitant increase in ploidy which is not constant either throughout larval life or in the different regions of the gland.Histochemistry on the glands of the mid-fifth instar larva shows that progressively more mucosubstances are deposited in the lumen, so that while in the distal regions there is only one weakly acidic deposit, this is increased to three more acidic bands in the proximal regions. These bands can be correlated with materials of different electron density. All five regions have characteristic secretory ultrastructure, with prominent secretory vesicles or granules and microvilli. However, the posterior and middle regions have electron-translucent vesicles and relatively short microvilli, while the other three regions have electron dense granules and a more complex, microvillate apical surface. This complexity is greatest in the duct which suggests that it may function in water reabsorption.

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Zur funktionellen Morphologie der Fibroin- und Sericin-sekretion der Seidendr�se von Bombyx mori L.

Cited by 13 publications

References 4 publications

Spider's super-glue: thread anchors are composite adhesives with synergistic hierarchical organization

Spider's super-glue: thread anchors are composite adhesives with synergistic hierarchical organization

Cytochemical changes in the silk gland cells ofPericallia ricini (Lepidoptera: Arctiidae)

Studies on the silk glands of Calpodes ethlius stoll, (Lepidoptera, hesperiidae)

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