conchiolin


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conchiolin

a fibrous insoluble protein that forms the basic structure of molluscs.
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As the protein conchiolin in abundant in molluscs, the concentrations of its main amino acids, such as glycine, arginine, valine, and lysine (Bowen & Tang, 1996), presumably influence the total amino acid budget of the samples.
However, because the tiny iron sulfide spheres also show up throughout the conchiolin core of each scale, the snail itself probably controls the overall growth and placement of the particles, says Waren.
1991; [ILLUSTRATION FOR FIGURE 1A OMITTED]) have assumed (or in a few cases demonstrated) that the incomplete drillholes terminated at conchiolin layers.
BRD is characterized by distinct physical signs that give the disease its name: (1) pathogen proliferation within the extrapallial compartment and (2) disruption of normal production of periostracal lamina inducing the formation of the characteristic brown conchiolin deposits on the inner shell (Paillard et al.
ABSTRACT Brown ring disease (BRD) in the Manila clam is characterized by the formation of a brown deposit of conchiolin on the inner surface of the shell that gives the disease its name.
These cavities are filled with calcium carbonate (aragonite) crystals perpendicularly to the outer periostracum and separated by a conchiolin membrane.
The deep, multilayered, cup-shaped lower valve is cemented to the substratum and the thin, flat upper valve is usually marked with fine radially striated conchiolin externally (Kilburn & Rippey 1982).
Evidence from the fossil record of an antipredatory exaptation: conchiolin layers in corbulid bivalves.
BMD induces a transformation of the posterior adductor muscle, which becomes infused by conchiolin and calcified (Dang et al.
Previous research has shown that the periodic growth structures contained within molluscan shells develop from changes in the density of calcium carbonate, the ratio of aragonite to calcite, the proportion of calcium carbonate to conchiolin (the organic component of the shell), the size of the crystals, or the type of crystalline microstructure (Pannella & MacClintock 1968, Rhoads & Lutz 1980, Jones 1983).
A similar but yellowish conchiolin material was reported in Tellina spp.
Diagnostic methods for BRD have traditionally involved examination of the interior shell valves for analysis of conchiolin deposition, as described by Paillard & Maes (1994).