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 34 for “"Bacterial Cellulose"”.
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Production of Bacterial Cellulose Using Low-cost Media
Bacterial cellulose (BC) is a polymer of glucose monomers, which has unique properties including high crystallinity and high strength. It has the potential to be used in biomedical applications such as making artificial blood vessels, wound dressings, and in the paper making industry. Unlike …
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Suspension, yielding, microstructure and applications of bacterial cellulose dispersion
… This work examines the unique yielding of bacterial cellulose fiber networks using a new microrheology technique developed specifically for this purpose. The fiber gels exhibit a dynamic structural rearrangement response to applied stress that is shown to be advantageous in applications …
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Design of Iron Oxide-Flavin Nanocomposite Bacterial Cellulose Hydrogels
In this work, a hybrid material based on bacterial cellulose (BC) hydrogels and magnetic photocatalysts was developed. Cellulose is capable of coordinating to metal oxides such as magnetic iron oxide nanoparticles (IONPs). When IONPs are coupled to flavins, naturally occurring photoactive …
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Liposome-loaded biosynthetic bacterial cellulose hydrogels for wound management applications
… process. In the present study, biosynthetic bacterial cellulose hydrogels were synthesised by Gluconacetobacter xylinus (ATCC 23770) and loaded with antimicrobial agents. Characterisation studies were carried out on these biosynthetic hydrogels for their wound healing properties. Due to the …
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Evaluation of Surface Acetylated Bacterial Cellulose for Antibacterial Wound Dressing Applications
… arise due to infection by pathogenic bacteria. Bacterial hydrolytic enzymes degrade the host tissue while biofilms can shield the bacterial cells from the host's immune response. Wound dressings with bacteriostatic or bactericidal properties are a promising solution. This study investigated the …
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Development of an electronic paper prototype on bacterial cellulose using electrochromic systems
… to develop an electronic paper prototype on bacterial cellulose. Electrochromic systems were used to demonstrate the proof of concept of a dynamic display on cellulose. Bacterial cellulose was synthesized in a culture of NQ-5 strain of Acetobacter xylinum in the standard glucose-rich (SH) …
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A study of bacterial cellulose confined ionic liquid and deep eutectic solvent gel materials
… ILs and DESs within a cellulosic matrix called bacterial cellulose iono/eutecto gels are produced that are shown to be applicable to analyte detection and are studied for a better understanding of the dynamics within the gel. These intriguing gels are flexible, transparent, size-tuneable, …
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Development and characterisation of biosynthetic hydrogels for wound management applications
… agents. In the current study, biosynthetic bacterial cellulose hydrogels synthesised by Gluconacetobacter xylinus (ATCC 23770) and subsequently loaded with antimicrobial healing agents, were characterised for their wound healing properties. Loading parameters were optimised based on …
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The transcription factor, fixK, plays a central role in carbon source metabolism and cellulose synthesis in Komagataeibacter species
… ATCC 53582 and K. hansenii ATCC 23769 are model bacterial cellulose producers. This thesis investigated both carbon source utilization and the role that a Crp/Fnr transcription factor, FixK, plays in bacterial cellulose biosynthesis. Extracellular proteins secreted by Komagataeibacter were …
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Free methionine sulfoxide reductase and its contributions to environmental stress response in Komagataeibacter hansenii
… The ΔmsrC mutation greatly affects growth, bacterial cellulose synthesis, abscisic acid response, quorum sensing and variability of cell size. Complementation restored some WT characteristics but revealed new phenotypes linked to bacterial cellulose synthesis. The tolerance to reactive …
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Biosynthesis of polyhydroxyalkanoates, their novel blends and composites for biomedical applications
… 4-, 5- and 6- hydroxyalkanoic acids produced by bacterial fermentation in a nutrient limiting conditions with excess carbon. They can be produced easily using renewable carbon sources. They are biodegradable and biocompatible in nature. Their physical properties are highly tailorable and a range …
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Living matter : biomaterials for design and architecture
… and enhancing the material properties of 3D bacterial cellulose inflated structures. Bacterial cellulose is produced by bacteria that create membranes of cellulose, layer by layer, in a fashion similar to additive manufacturing. The cellulose can be grown into virtually any given shape in a …
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Antibiotic-free antibacterial hydrogels for wound healing applications
Over the past decades, bacterial cellulose (BC) has attracted great interest as a wound dressing thanks to its innate hydrogel-like structure and high biocompatibility. However, the lack of antibacterial features of cellulose poses some limitations to its use, especially in the context of …
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Ethylene response and phytohormone-mediated regulation of gene expression in Komagataeibacter xylinus ATCC 53582
… xylinus ATCC 53582 is a fruit-associated, cellulose-producing bacterium that responds to and synthesizes phytohormones. This thesis elaborates on the ecophysiology of K. xylinus. Responses to indole-3-acetic acid (IAA), abscisic acid (ABA) and ethylene, produced in situ from ethephon, were …
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Characterization of a carbon source-dependent, phytohormone-responsive, free methionine-(R)-sulfoxide reductase from Komagataeibacter hansenii
… bacterium, best known for its ability to produce bacterial cellulose (BC). BC, an extracellular polysaccharide, is an important component of biofilms as it promotes anchoring to surfaces for nutrient acquisition and protection from environmental stress. BC has been long studied however, there is a …
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FROM AGRI-FOOD WASTE TO HIGH-VALUE COMPOUNDS VIA GREEN TECHNOLOGY APPROACHES
… an extremophilic glycosidase immobilized on bacterial cellulose films, where both substrate and support were derived from the same biomass, reinforcing the concept of feedstock circularity. Finally, a self-sufficient biocatalyst combining an ene reductase and a glucose dehydrogenase was …
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Surface-Enhanced Raman Spectroscopy for Environmental Analysis: Optimization and Quantitation
… is poor. In this dissertation, gold nanoparticle/bacterial cellulose (AuNP/BC) substrates were developed to improve SERS sensitivity by increasing hot spot density within the laser excitation volume. Environmentally relevant organic amines were fixed at "hot spots" by lowering solution pH below …
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Finite element and mechanobiological modelling of vascular devices
… mechanical behaviour in-situ. In this context, bacterial cellulose (BC), a novel biomaterial, was mechanically characterised and a constitutive model was developed to describe its mechanical response. In addition, the interaction of smooth muscle cells with BC was studied using cell culture …
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Fabrication of novel functional anisotropic micro-particles for foam stabilisation and structuring in food formulations
… particles. Acidic hydrolysis of Nata de Coco bacterial cellulose was used to form cellulose nano-rods which were applied as a foam scaffolding material. Characterisation and modification of Nata de Coco nano-rods was also carried out. It was found that cellulose nano-rods modified with a …
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