Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"biomineral"”.
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Rates and dates: Evaluating rhythmicity and cyclicity in sedimentary and biomineral records
… in ocean temperature through the life of the biomineralizing organism. This study examines some of the methods by which we can analyze environmental fluctuations recorded at different time scales. The first project examines the methods by which extrabasinal orbital forcing (i.e. Milankovitch …
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Identification and characterization of diatom kinases catalyzing the phosphorylation of biomineral forming proteins
… and silacidins play a significant role in biomineral formation, yet no kinase has been identified that phosphorylates these biomineral forming proteins. This dissertation describes the characterization of a novel kinase from the diatom Thalassiosira pseudonana, tpSTK1, which is upregulated …
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Biomineralized Composites: Material Design Strategies at Building-Block and Composite Levels
Biomineral composites, consisting of intercrystalline organics and biogenic minerals, have evolved unique structural designs to fulfill mechanical and other biological functionalities. Aside from the intricate architectures at the composite level and 3D assemblies of the biomineral building blocks, …
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Calcium carbonate biomineralization: A theoretical and experimental investigation of biomolecular controls on nucleation and growth
… of the organic assemblages associated with biominerals across a wide variety of taxa, has limited our understanding of how organisms use biomolecules to regulate skeletal formation. It is clear that a mechanistic picture of biomolecular controls on mineralization requires molecular-level …
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Structural and morphological characterization of hydrozincite and its interaction with organic molecules
… social value. Common biogenic materials, such as biominerals, constructed with mineral phases and an organic matrix exhibit delicate structure with unusual optimal chemical-physical, morphological and mechanical properties, and have inspired ideas for the design and synthesis of biomimetic …
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Effects of the 1982-1983 El Niño mega event on bivalve mollusk biomineralization
… (SST) anomaly during the event. Common biomineral alterations include changes in the relative thickness of certain microstructural types and the loss of intercrystalline organic matrix components. δ^18O_shell and δ^13C_shell data show no significant changes in correlation with the El …
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Elucidating Structure-Property Relationships for Targeted Materials Mechanical Design
… materials in nature, focusing specifically on biomineral fracture. We then utilize modern advances in machine learning to enhance our exploration of structure and property, treating first the problem of crystalline fracture and subsequently other mechanical properties of compliance and buckling …
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Biologically Controlled Mineralization and Demineralization of Amorphous Silica
… depth of this problem, as it pertains to biomineralization, is related to the small number of existing studies focused on the development of a mechanism-based understanding of intracellular mineralization processes. Molecular biologists and geneticists have only begun to turn their …
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Establishing a Baseline for Kinetic and Thermodynamic Origins of Vital Effects: Toward an Understanding of Factors Controlling Mg Signatures in Calcite
… construct viable paleoenvironmental proxies from biomineral compositions, we must resolve the effects of environmental conditions from the vital effects of the organism by first understanding the underlying thermodynamic and kinetic mechanisms for incorporating minor and trace elements. Using in …
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Chemical Controls on the Formation of Amorphous and Crystalline Calcium Phosphates
… and brushite into hydroxylapatite, an important biomineral, has been documented. The relationships between synthesis conditions and the formation and transformation of these phases are not comprehensively understood. The metastable nature of ACP has made it historically challenging to …
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Solid-Binding Peptides Enable Biomolecular Surface Assemblies and Mineralization
… of peptides for distinct polymorphs and their biomineralization; and 3. Peptide-ion interactions, via solution processing and peptide-controlled biomineralization. The research was undertaken using an array of molecular biology, genetic engineering, materials science and engineering techniques …
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A Solid State NMR Investigation of Poly (ADP-ribose) and Its Involvement in Tissue Calcification
The mechanisms of bone and vasculature biomineralisation are not fully understood. It is unclear how the calcium and phosphate ions are concentrated at the calcification site, and how the composition and structure of the mineral phase changes during maturation. This work aims to use solid state NMR …
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Biomolecular Controls on Calcium Carbonate Formation by Amorphous and Classical Pathways: Insights from Measurements of Nucleation Rates and Isotope Tracers
… complicated by the realization that carbonate biominerals can form by an amorphous to crystalline transformation process, which has prompted the question of how chemical signatures are recorded during mineralization. Investigations of mineralization processes such as the kinetics of nucleation …
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Mechanisms of Coral Calcification: a Geochemical and Computational Approach to Understanding Biomineralisation
… dynamics of the micron-sized space where coral biomineralisation occurs, with the aim of building a complete mechanistic model of how corals transform dissolved ions in seawater into an intricate mineralised skeleton. Analysis of skeletal chemistry following controlled culturing experiments …
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Retrosynthese von Perlmutt
… physikalisch-chemischer Mechanismen in der Biomineralisation gegenüber der bisher angenommenen Dominanz spezifischer biomolekularer Erkennungsmechanismen aufzuzeigen. Dazu wurden drei Ansätze verfolgt: Zum einen wurden Studien zur Calciumcarbonatkristallisation durchgeführt. Zum anderen …
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Influence of Solution Composition and Temperature on the Strontium Content of Amorphous Calcium Carbonate and Subsequent Calcite
… the trace element composition of the CaCO₃ biomineral products. The recent discovery that calcifying organisms produce amorphous calcium carbonate (ACC) as an intermediate phase during the crystallization process calls into question whether this pathway to mineral formation affects trace …
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Polysaccharide controls on the kinetics and thermodynamics of CaCO₃ nucleation: Insights for biological crystallization and other biofunctions
… biochemical processes from cell signaling to biomineralization, yet our knowledge of how glycomaterials influence biological processes is limited compared to proteins. We particularly lack a quantitative understanding of how differences in the functional group compositions and positions on …
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A novel view on the early stage of crystallization
… major part of water hardness, the most abundant Biomineral and forms huge amounts of geological sediments thus binding large amounts of carbon dioxide. The primary experiments base on the evolution of supersaturation via slow addition of dilute calcium chloride solution into dilute carbonate …
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Linking the kinetics of formation and growth to the mechanical properties of calcium carbonate composites
… to shed light into the mechanisms that drive biomineral formation and inspired the development of highly tunable composite materials. Despite recent leaps in the understanding of these systems, a clear connection linking the kinetics of calcium carbonate formation, microstructure and enhanced …
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Hydrozincite bioprecipitation: a promising tool for bioremediation of waters contaminated by harmful metals. Hydrochemical factors and morphological features of the biomineralization process
… on environmental conditions that promote the biomineralization process is fundamental for the development of remediation strategies. This work aims to investigate the variables controlling the biomineralization process, and the hydrochemical factors that affect hydrozincite precipitation. …
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