Zeth, Kornelius Hoiczyk, Egbert Okuda, Mitsuhiro â–º Self-assembly and the distorted calcite existed in the mineralization process.įerroxidase- Mediated Iron Oxide Biomineralization â–º WSM can fine control crystal size smaller than that with the additive of ASM. â–º WSM of aragonite pearl mediates to produce aragonite. â–º ASM of vaterite pearl induces vaterite. Highlights: â–º WSM, ASM and AIM are extracted from aragonite pearls and vaterite pearls. Further study of the precise control of these matrix proteins on CaCO 3 crystal growth is being processed. Current results demonstrate important aspects of matrix protein-controlled crystallization, which is beneficial to the understanding of nacre biomineralization mechanism. Moreover, self-assembly phenomenon in the biomineralization process and the distorted morphology calcite are observed. Additionally, the crystal size obtained with the additive of WSM of the two kinds of pearls is smaller than that with the additive of ASM.
The single AIM membranes of the two pearls have no pronounced effect on the CaCO 3 crystallization. ASM of vaterite pearls can induce vaterite to crystallize and WSM of aragonite pearls mediates to produce aragonite crystals. Influences of the six kinds of organic matrices on the calcium carbonate crystal growth are proposed. Scanning electron microscopy (SEM) was utilized to observe the morphology of CaCO 3 and Raman spectroscopy as a powerful technique was used to distinguish the crystal polymorph. Then, in-vitro calcium carbonate crystallization experiments under the control of these six organic matrices were carried out in the present study. International Nuclear Information System (INIS)įor the purpose of studying the mediation of organic matrix on the crystallization of calcium carbonate, water soluble matrix (WSM), acid soluble matrix (ASM) and acid insoluble matrix (AIM) were extracted from aragonite pearls and vaterite pearls respectively. In-vitro study on calcium carbonate crystal growth mediated by organic matrix extracted from fresh water pearls This knowledge concerning the mineral composition and organizational patterns of crystals within the cell walls should be taken into account in future studies of changing ocean conditions as they represent important factors influencing the physico-chemical interactions between rhodoliths and the environment in coralline reefs. Biomineralization in L. crispatum is dependent on both the soluble and the insoluble organic matrix, which are involved in the control of mineral formation and organizational patterns through an organic matrix-mediated process. This organism is an important model for biomineralization studies as the crystallographic data do not fit in any of the general biomineralization processes described for other organisms.
However, the crystals displayed cleavages in the (104) faces after ultrathin sectioning with a microtome.
The crystallites in the bulk of the cell wall had a high level of spatial organization. At the nanoscale, the crystals from L. crispatum consisted of several single crystallites assembled and associated with organic material. A nanostructured pattern was observed in L. crispatum along the cell walls. The aim of this study was to describe the cell wall ultrastructure of Lithothamnion crispatum, a cosmopolitan rhodolith-forming coralline algal species collected near Salvador (Brazil), and examine the relationship between the organic matrix and the nucleation and growth/shape modulation of calcium carbonate crystals. However, the relationship between the mineral phase and the organic matrix in coralline algae has not yet been thoroughly examined. Over the past few decades, progress has been made toward understanding the mechanisms of coralline algae mineralization. Biomineralization of calcium carbonate in the cell wall of Lithothamnion crispatum (Hapalidiales, Rhodophyta): correlation between the organic matrix and the mineral phase.ĭe Carvalho, Rodrigo Tomazetto Salgado, Leonardo Tavares Amado Filho, Gilberto Menezes Leal, Rachel Nunes Werckmann, Jacques Rossi, André Linhares Campos, Andrea Porto Carreiro Karez, Cláudia Santiago Farina, Marcos
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