Search results for "matrice organique"
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Biominéralisation chez les Céphalopodes (Mollusca) : processus moléculaires et évolution
2021
Molluscs constitute one of the most diversified phyla within metazoans, known for their ability to mineralize a shell. The shell biomineralization is a genetically controlled process that is performed extracellularly via a calcifying organic matrix. This latter, which remains finally occluded (at least, partially) into the shell, is a mixture of proteins, glycoproteins, lipids and polysaccharides, that are collectively secreted by the external calcifying epithelium of the mantle. Today, the shell matrix is usually considered as the ‘molecular toolbox’ for constructing the shell. Since its discovery, it has been the focus of numerous studies, but mainly on bivalves and gastropods leaving cep…
Inorganic/Organic interface in biominerals : unveiling the complex structure of two calcitic biomineral models, the red coral Corallium rubrum and th…
2022
Biominerals are organo-minerals structures produced by living systems. Since the Cambrian, they contribute to the adaptation of living organisms to different environments by fulfilling a variety of combined functions that go along with adapted morphologies. One of the aims of biomineralization is to understand how organisms "sculpt" these complex morphologies, in particular at nano and molecular scales. The aim of this PhD work was to understand the complex relationships between the organic and mineral phases. To this end, I focused my analyses on two calcitic biomineral models: 1) the red coral Corallium rubrum and 2) the prismatic shell of the Mediterranean fan mussel Pinna nobilis. My wo…
Evolution des biominéralisations nacrées chez les mollusques : caractérisation moléculaire des matrices coquillières du céphalopode nautiloïde Nautil…
2008
In metazoan, molluscan shells are one of the most fascinating examples for the investigation of the calcium carbonate biomineralization phenomenon. These exoskeletons are secreted by the outer epithelium of the calcifying mantle. They are composed of 95% of mineral – calcite and/or aragonite -, the rest of the shells being constituted by a mixture of proteins, glycoproteins and polysaccharides, called the organic matrix. This calcifying matrix is directly involved in biomineralization. This PhD work is focussed on the characterization of organic components associated to the nacreous layer. In molluscs, the nacre is observed in shells of extent species of bivalves, gastropods, cephalopods an…