Nom du corpus

Corpus Systématique Animale

Titre du document

An electron microscope study of the formation of the nacreous layer in the shell of certain bivalve molluscs

Lien vers le document
Springer (journals)
Langue(s) du document
Type de document
Mots-clés d'auteur
  • Nacre
  • Pallial fluid
  • Crystal growth
Nom du fichier dans la ressource
  • Dr. Gerrit Bevelander 1,2
  • Hiroshi Nakahara 1,2
  • 1) Department of Histology, The University of Texas Dental Branch, 6516 John-Freeman-Avenue, 77025, Houston, Texas, USA
  • 2) The Bermuda Biologocal Station for Research, 6516 John-Freeman-Avenue, 77025, Houston, Texas, USA

An electron-microscopic study was made of nacreous shell growth in several species of marine molluscs. Studies of sections of mantle-shell preparations show that the first step in crystal formation is the “polymerization” of part of the pallial fluid to form lamellae parallel to the surface of the epithelium. These lamellae form compartments enclosing a modified apallial fluid. Initiation of crystals occurs in these compartments in contact with a crystal in an adjacent layer. During crystal growth the organic matrix present in the compartment is displaced by the growing surface of the crystal. When growth is complete the crystal is entirely enveloped by a delicate organic sheath. These studies show that the pallial fluid with its organic constituents is responsible for supplying a matrix or substrate for crystal initiation and growth. It serves as a regulatory device for guiding the orderly growth and arrangement of crystals and, further, it may participate in the induction of new crystals. The formation of compartments during shell growth accounts for the uniform thickness, preferred exhibited orientation and mineralogy of the crystals as well as other features exhibited by the mature nacre.

Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - psychologie. psychophysiologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Endocrinology
  • 1 - Health Sciences ; 2 - Medicine ; 3 - General Medicine
Identifiant ISTEX

Calcified Tissue Research

Année de publication
Présence de XML structuré
Version PDF
Score qualité du texte
  • Mollusques
Type de publication
Powered by Lodex 9.3.8