fulltext.study @t Gmail

The nature and formation of calcitic columnar prismatic shell layers in pteriomorphian bivalves

Paper ID Volume ID Publish Year Pages File Format Full-Text
12095 777 2005 11 PDF Available
Title
The nature and formation of calcitic columnar prismatic shell layers in pteriomorphian bivalves
Abstract

The calcitic columnar prismatic (CCP) microstructure constitutes the external shell layer of pterioid and ostreoid bivalves. It consists of calcite monocrystals, which extend perpendicular to the growth surface and are surrounded by thick interprismatic membranes (<1–8 μm). The exceptional biomechanical properties of CCP layers make them interesting for biomechanical–biomimetic studies. Their potential as biomedical implants still requires further testing. Previous studies attributed the mineral phase a crucial role in the organization of the microstructure. Conversely, our observations on the morphology of prisms and abnormally calcified shells reveal that the organic web may form in the absence of the mineral infilling and that the boundaries between prismatic units are shaped by interfacial tension. Accordingly, we consider interprismatic organic membranes as the main shaping agent. We propose that the prismatic layer initiates as an emulsion formed by the fluid precursor of organic membranes and the extrapallial fluid, which causes formation of empty organic cavities. Prismatic crystals began to form within the organic cavities a little later, but their secretion surface soon levelled that of organic membranes.

Keywords
Biomineralisation; Microstructure; Shell; Calcite; Prismatic layer; Bivalves
First Page Preview
The nature and formation of calcitic columnar prismatic shell layers in pteriomorphian bivalves
Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 32, November 2005, Pages 6404–6414
Authors
, , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering