nacreous layer sentence in Hindi
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- The nacreous layer of monoplacophoran shells appears to have undergone some modification.
- The nacreous layer is excessively thin, especially in the typical form.
- Conversely, the nacreous layer is derived from the main surface of the mantle.
- Sometimes, the aragonite forms an inner, nacreous layer, as is the case in the order Pterioida.
- But the beauty of pearls is literally a reflection of their surface and subsurface nacreous layers.
- The nacreous layer of the aragonite fossil shells of some extinct ammonites forms an iridescent material called ammolite.
- The calcium carbonate layers in a shell are generally of two types : an outer, chalk-like prismatic layer and an inner pearly, lamellar or nacreous layer.
- This foliated aragonite is presumed to have evolved from the nacreous layer, with which it has historically been confused, but represents a novelty within the molluscs.
- RT-PCR demonstrated that the transcript of aspein is expressed at the outer edge of the mantle, corresponding to the calcitic prismatic layer, but not at the inner part of the mantle, corresponding to the aragonitic nacreous layer.
- Whilst normal nacre, and indeed part of the nacreous layer of one monoplacophoran species ( " Veleropilina zografi " ), consists of " brick-like " crystals of aragonite, in monoplacophora these bricks are more like layered sheets.
- The homology of biomineralization pathways is underlined by a remarkable experiment whereby the nacreous layer of a molluscan shell was implanted into a human tooth, and rather than experiencing an immune response, the molluscan nacre was incorporated into the host bone matrix.
- In oysters and potentially most molluscs, the nacreous layer has an organic framework of the protein MSI60, which has a structure a little like spider silk and forms sheets; Aspartic acid, which can make up up to 50 % of shell framework proteins, is most abundant in calcitic layers, and also heavily present in aragonitic layers.
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