کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1975762 | 1060653 | 2011 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Shell layers of the black-lip pearl oyster Pinctada margaritifera: Matching microstructure and composition Shell layers of the black-lip pearl oyster Pinctada margaritifera: Matching microstructure and composition](/preview/png/1975762.png)
The nacre–prism transition of the mollusc shell Pinctada margaritifera was studied using scanning electron microscopy, electron probe micro-analysis (EPMA) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). Mineralogical change is correlated with a change in organic matrix. Previous analyses had shown that sugars were involved in the transition layer (fibrous aragonite). The new Energy Dispersive Spectrometry (EDS) and TOF-SIMS maps show that the modifications at the layer boundary are complex, and that proteins and lipids are also involved. Detailed TOF-SIMS maps show that the thick organic envelopes surrounding the prisms, and between the prisms and the fibrous aragonitic layer, are not composed by regular layers, but are a patchwork of various molecules. The amino acid compositions of the nacreous and prismatic layer are compared thanks to the TOF-SIMS localized analyses.
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 159, Issue 3, July 2011, Pages 131–139