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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 34 for “"organic matrix"”.
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Characterization of the Organic Matrix of Mature Human Tooth Enamel: Structure, Macromolecular Composition and Effect of Radiotherapy
… human tooth enamel contains a small amount of organic matrix locally concentrated within its innermost region, which is tougher and more crack resistant than the outer bulk phase. Although the enamel organic matrix is regarded to contribute to these properties, its structure and macromolecular …
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Structural and morphological characterization of hydrozincite and its interaction with organic molecules
… 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 functional materials. The organic templates play an …
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The Distribution of Bone Sialoprotein in Bone Mineralization
Bone consists of an organic matrix and hydroxyapatite (HA) crystals. The mechanism by which bone mineralizes the organic matrix is not clearly understood. Collagen provides the framework of bone and may even play a role in the nucleation of the HA crystals through the hole zones within collagen …
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Pulse microwave mediated sample clean-up method to analyse trace metals, PCBs and pesticides, and for treatment of organic wastes
… wet ashing system. In wet ashing procedure organic matrix in biological tissues is digested in acid. This step must precede trace metal analysis by atomic absorption spectroscopy. Conventional wet ashing procedure using hot plate takes several hours. Digestion of animal and plant tissues by …
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Effect of ionic strength on heterogeneous nucleation of calcite during biomineralization
Biominerals often form within a matrix of biomacromolecules in high-salinity environments, yet the relationships for how macromolecules and ionic strength influence the crystallization of sparingly soluble salts (e.g., CaCO₃) are not established. Developing a physical picture of these controls is …
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Uncovering the role of biomineralisation in otolith trace element uptake by microstructural and microchemical analysis
… the orientation of aragonite and the organic matrix in otoliths of four marine species were investigated in conjunction with the otolith growth patterns and the distribution of trace and minor elemental composition. Results for otoliths of Platycephalus bassensis, Chrysophrys auratus, …
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Biochemical approaches to investigate biomineralization of magnesium calcite and aragonite
… composites containing a very low percentage of organic matrix amidst a dense mineral phase. Despite having low organic contents, these natural materials are superior to most other synthetic composite ceramics in mechanical strength and toughness. Since biominerals are synthesized at ambient …
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Mapping of elastic modulus and hardness in Trochus niloticus seashell nacre by nanoindentation
… aragonite mineral form and a biomacromolecular organic matrix. Nanoindentation was carried out in a pattern of square grids of 256 indents at maximum loads of 1 mN and 500 gN. The average elastic modulus and hardness for the 1 mN indents were found to be 97.8 GPa + 6.41 GPa and 5.41 GPa ± 0.49 …
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Sorption and degradation of pesticides in biopurification systems
… water, consist of a biologically active matrix that retains pesticides into the organic matter and enhances their biodegradation. In order to optimize the efficiency of these systems, the fate of pesticides and the contribution of degradation and retention process needs to be well …
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Effects of the 1982-1983 El Niño mega event on bivalve mollusk biomineralization
… their shells (e.g., temperature, dissolved inorganic carbon (DIC)). Bivalves that endure extreme environmental perturbations also exhibit alteration of the shell microstructure in response to the stress. Numerous studies demonstrate correlations between shell isotopic values and environmental …
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ΣΥΓΚΡΙΤΙΚΗ ΜΕΛΕΤΗ ΤΟΥ ΕΡΠΥΣΜΟΥ ΜΕΤΑΞΥ ΧΗΜΙΚΩΣ ΠΟΛΥΜΕΡΙΖΟΜΕΝΩΝ ΚΑΙ ΦΩΤΟΠΟΛΥΜΕΡΙΖΟΜΕΝΩΝ ΣΥΝΘΕΤΩΝ ΕΜΦΡΑΚΤΙΚΩΝ ΡΗΤΙΝΩΝ
… DEPEND ON THE DEGREE OF POLYMERIZATION OF ORGANIC MATRIX BESIDES THE FILLER CONTENT, COMPOSITION AND SIZE OF FILLER. - THEPHOTOINITIATED MATERIALS HAD THE LOWEST MODULI AND THE GREATEST CREEP AND DEFORMATIONS THAN THE SIMILAR SELF CURING MATERIALS. - THE MATERIALS MODULI VALUES WERE NOT IN …
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Coral skeleton density banding: biotic response to changes in sea surface temperature
… growth rate remain uncertain. The coral tissue organic matrix, composed of macromolecules secreted by the calicoblastic ectoderm, is closely associated with skeletal precipitation and is itself incorporated into the skeleton. We postulate that density banding is primarily controlled by changes …
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Bioinspired mineralization in hydrogels for sustainable materials processing
… mechanical properties, afforded by their inorganic-organic composite structure and well-controlled growth in macromolecular environments. More recently, growing concerns over climate change and environmental sustainability and the emerging relevance of green chemistry make biomineralization …
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Optical characterisation of the interaction between calcium-silicate based dental restorative materials and dentine
… the observation of mineral formation inside the organic matrix of demineralised dentine when aged in an in-vitro model. Fluorescence lifetime imaging and second harmonic generation imaging were also used for the characterisation of re-mineralisaion and collagen denaturation respectively. For the …
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Evaluating the Hazard of Land Applying Composted Diazinon Waste Using Earthworm Biomonitoring
… involves the sorption of pesticides onto an organic matrix followed by degradation in a composting environment. We are now evaluating the hazards that might be associated with land-applying composted pesticide waste. Diazinon was the first pesticide selected for evaluation, which consisted of …
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The biology and taxonomy of Mesozoic stromatoporoids
… of siliceous spicules bound together with an organic matrix, which probably provided the nucleation sites for subsequent precipitation of the calcareous skeleton. A new taxonomic scheme is presented based on spicule type, arrangement and relationship of this framework to the microstructure of …
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MRI Quantification of Cortical Bone Microstructure and Material Composition with Ultrashort Echo Time Sequences
… quantification of cortical bone microstructure, organic matrix density, and mineral content in vivo in clinically practical acquisition times. Therefore, the primary objective of this dissertation was to perform the first investigation of these cortical bone parameters in patients with diagnosed …
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Photodynamically Activated Multifunctional Chitosan Nanoparticles to Disinfect and Improve Structural Stability of Dentin
… and, 2) to stabilize and strengthen the dentin organic matrix by crosslinking collagen fibrils in the presence of biopolymeric nanoparticles. A bioactive polymeric nanoparticle functionalized with a photosensitizer may present as a single step treatment to achieve both the objectives. Chitosan a …
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Synthetic Strategies and Design of Highly Luminescent Cholinomimetic Quantum Dots
… QDs were synthesized using a CdSe/ZnSe/ZnS inorganic core in a colloidal organic matrix with trioctylphosphine, trioctylphosphine oxide and hexadecylamine as the coordinating ligands and passivating agents to control growth. The QDs were ~6.2 nm in diameter and exhibited strong and narrow …
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Synthesis of Nanostructured Organic and Inorganic Materials by Self-Assembly
… investigated the nanostructure, morphology of organic and inorganic materials grown in ordered organic matrices. The matrix is a binary system of water and the nonionic surfactant of oligo(ethylene oxide) n&d1; oleyl ether. Initial studies were conducted on mineralization of a calcium phosphate …
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