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Aspects ultrastructuraux de la biodegradation de l''ancienne cuticule de Carcinus maenas durant la periode preecdysiale ArchiMer
Thorez, A; Compere, P; Goffinet, G.
Ultrastructural observations of various integumental regions of the crab Carcinus maenas show an important biodegradation of the old sclerites during premolt. At the ecdysis, this biodegradation extends from the basis of the membranous layer up the upper third of the principal layer. The first biodegradation features are a disorganization followed by a complete disappearance of the microfibrils. Numerous ecdysial droplets and double membrane bounded microstructures probably take part in biodegradation processes.
Tipo: Text Palavras-chave: Carcinus maenas; Malacostraca; Ultrastructure; Moulting; Biodegradation.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/acte-1376.pdf
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Organisation, sclerotisation et composition minerale des sclerites d''une espece d'isopode marin et de quatre especes d'isopodes terrestres oniscoides ArchiMer
Ansenne, A; Compere, P; Goffinet, G.
The mineralized tergite cuticle of four terrestrial isopods (Oniscoidea) (Ligia oceanica, Oniscus asellus, Porcellio scaber and Armadillidium vulgare ) and of the marine isopod Sphaeroma serratum shows a general organization comparable to the fundamental plan of the decapod sclerite cuticle. Moreover, as in decapods, the procuticular layers are not tanned and mineralization rates, from 60 to 80% of the total cuticular dry weight, are of the same importance. However, the chitin protein microfibril distribution according to a homogeneous system in the mineralized procuticular proximal layer in all isopod species so far studied does not allow any comparison of this layer with the non-mineralized membranous layer.
Tipo: Text Palavras-chave: Sphaeroma serratum; Armadillidium vulgare; Porcellio scaber; Oniscus asellus; Ligia oceanica; Isopoda; Malacostraca; Comparative studies; Mineralization.
Ano: 1987 URL: http://archimer.ifremer.fr/doc/1987/acte-1374.pdf
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