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Amorphous, hydrous, ferric phosphatic dermal granules in Molpadia (Holothuroidea): Physical and chemical characterization and ecologic implications of the bioinorganic fraction
Lowenstam, H.A.; Rossman, G.R. (1975). Amorphous, hydrous, ferric phosphatic dermal granules in Molpadia (Holothuroidea): Physical and chemical characterization and ecologic implications of the bioinorganic fraction. Chem. Geol. 15(1): 15-51. hdl.handle.net/10.1016/0009-2541(75)90011-x
In: Chemical Geology. Elsevier: New York; London; Amsterdam. ISSN 0009-2541, more
Peer reviewed article  

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Keywords
    Holothuroidea [WoRMS]; Molpadia intermedia (Ludwig, 1893) [WoRMS]; Marine

Authors  Top 
  • Lowenstam, H.A.
  • Rossman, G.R.

Abstract
    The bioinorganic fraction of the dermal granules of Molpadia intermedia from a wide variety of habitats has been studied by chemical analysis, electron microscopy, X-ray diffraction, thermal analysis, visible and infrared spectroscopy and magnetic susceptibility. It was found to have many similarities to polynuclear iron(III) proteins. Silica was found to be an integral component of the granules. The proportions of the major elements, P and Si, were found to vary with habitat as well as the minor elements, Ca and Mg, whereas the Fe content remained relatively constant. Models are proposed for the microstructure of the granules and the processes of their growth.

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