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.
Results
Showing 1 to 20 of 29 for “"Ion release"”.
-
The kinetics of ion release by glass-ionomer cements
… were used in this study: four commercial conventional GICs, one in-house conventional GIC made from G338 glass powder, one commercial glass-ionomer bone cement and four in-house novel aluminium free Fe2O3 based GICs. Cylindrical specimens of GICs were prepared in stainless steel moulds to form 6 …
-
Methods for Zinc Ion Release from Orthodontic Cement Pastes
The prevention of plaque and calculus build up around orthodontic appliances is a difficult task for many patients. Current literature shows free zinc ions have the ability to hinder the progression of plaque and diminish the subsequent consequences. This study demonstrates the ability of two …
-
The ion release behaviours and water sorption of novel resin-based calcium phosphate cement
… to provide calcium (Ca) and phosphate (PO4) ions, which have been proposed to enhance remineralization of demineralized tooth structure. Recently, tricalcium phosphate (TCP)-filled restorative materials were introduced as an alternative to amorphous calcium phosphate. The TCP filler has a …
-
The Effect of Particle Surface Area to Volume Ratio on Ion Release from CoCr Spheres
… wear rate, durability, and resistance to corrosion. In spite of these advantages, little is known concerning the long-term consequences of heavy metal alloy use in the body, although early research indicates potentially carcinogenic results. This thesis is a preliminary investigation into these …
-
A liposome-based ion release impedance sensor for HIV detection at the point-of-care
… living in remote and resource-limited regions around the world face a barrier to adequate medical care due to the unavailability of diagnostic instrumentation to perform standard measurements which diagnose disease and inform treatment. Factors which limit the availability of diagnostics …
-
Phosphate, Calcium, and Fluoride Ion Release From Polyurethane Based Microcapsules Formulated in a Resin Based Dental Varnish
… significant oral health challenge. Demineralization occurs in an acidic environment and can be further accentuated by the presence of acid producing cariogenic bacteria. As the pH decreases, the salivary fluid becomes undersaturated with calcium and phosphate ions, resulting in these ions being …
-
The Release of Calcium, Fluoride, and Phosphate Ions from Ion Permeable Microcapsules in a Rosin Varnish
The prevention of caries continues to remain a prominent concern among dental professionals. Although products such as toothpaste, mouthwash, and sealants have all targeted this process, the challenge against primary and secondary caries still persists. This study provided a distinctive approach by …
-
Evaluation of Colloidal Stability and Ecotoxicity of Metal-based Nanoparticles in the Aquatic and Terrestrial Systems
… nano-enabled products are atomic-size multifunctional engineered nanomaterials, which upon release contaminate the environments, raising considerable health and safety concerns. This Ph.D. dissertation is designed to investigate (i) whether metals or oxide nanoparticles are more toxic than ions, …
-
Effect of adsorption of non-protolyzable anions on goethite (alpha-FeOOH) mobility
… CONTROLS ON THE MOBILITY OF MANY INORGANIC IONS IN THE ENVIRONMENT. ANION ADSORPTION ON IRON HYDROXIDE USUALLY DECREASES THE PARTICLE MOBILITY AND MAKES THE PARTICLE SURFACE LESS POSITIVE. HOWEVER, FOR SOME NON-PROTOLYZABLE ANIONS LIKE FLUORIDE AND ARSENITE, THE ADSORPTION HAS ALMOST NO …
-
Biodegradable Polymeric Ion Releasing Fillers
… pits and fissures of molars. However, polymerization shrinkage can lead to marginal leakage and secondary caries over time. Biodegradeable polymeric ion-releasing fillers (PIRFs) synthesized from alginate have the potential to be a useful sustainable tool that can provide sustained pH independent …
-
Bioactive Poly(Lactic-co-Glycolic Acid)-Calcium Phosphate Scaffolds for Bone Tissue Regeneration
… grafting. Autologous grafts may achieve functional repair; yet, they are available in limited supply and are associated with donor site morbidity. Allogeneic grafts are available in greater supply, but have a higher risk of infection. To overcome the disadvantages of current grafts, tissue …
-
Antimicrobial Properties of Gallium-Infused and Zinc-Infused Bioglasses: A Potential Cure for Coronavirus
… has drastically changed because of a new generation of coronavirus and the pandemic it has caused. Researchers have taken into consideration previously studied biomaterial solutions against microbes and have manipulated these materials to hypothesize a potential cure against this raging virus. …
-
Corrosion and trib-corrosion behaviour of metallic orthopaedic implant materials
Since the introduction of medical implants into human bodies, corrosion and wear have been regarded as key issues for their long-term durability. There has been a recent renewed interest in the use of large diameter metal-on-metal (MoM) hips, primarily because of the reduced volumetric wear …
-
Surface Optochemical Sensors
… to show remarkable changes after interaction with analytes from biological fluids and cells. My studies focused on pancreatic cells and addressed the need for improved techniques to measure zinc release from pancreatic cells (chapter 3, 4) and to measure the metastasis potential of …
-
Preliminary Development of The Dialysis-Membrane-based Passive Biocide Delivery System for Spacecraft Water Recovery Units
<p>The purpose of this investigation is to explore the capabilities of a dialysis-membrane-based system for the in-line dosing of silver ions to treated water in spacecraft water recovery units. The spacecraft environmental control and life support system community (ECLSS) are interested in …
-
pH Stability of Calcium Hydroxide Preparations in a Simulated Acidic Environment
… pH stability of three calcium hydroxide preparations—BC Temp (bioceramic-based), UltraCal XSTM, and mixed Ca(OH)₂ powder with saline—in simulated acidic and neutral environments. Materials and Methods 30 decoronated, single-rooted premolars were prepared using rotary files. The canals were …
-
Sulfate Dynamics and Base Cation Release in a High Elevation Appalachian Forest Soil
… their susceptibility to enhanced soil acidification via acidic atmospheric inputs. After initial physical, chemical, and mineralogical characterization, the soils were analyzed for their ability to adsorb and retain sulfate (SO₄²⁻) through a series of batch adsorption and desorption experiments. …
-
Abrasion-corrosion of cast CoCrMo in simulated hip joint environments
… improved wear performance compared to conventional metal-on-polymer bearings. MoM bearings operate at body temperature within a corrosive joint environment and therefore are inevitably being subjected to wear and corrosion as well as the combined action of tribo-corrosion. Issues such as metal …
-
Miniaturized Fluorescence Biosensor for Studying Neuronal Events
… the cellular content and the response to stimulation between cells and within a single cell. Conventional analysis techniques yield an average result to describe the content and function of cells. This approach often misses important information since the onset of pathological conditions is always …
-
RAPID COLORIMETRIC IDENTIFICATION OF ESCHERICHIA COLI SHIGA TOXINS 1 AND 2, AS WELL AS EAE AND AGGR, USING LOOP MEDIATED ISOTHERMAL AMPLIFICATION FOLLOWED BY PNA/AUNP DETECTION
… </em>This research utilizes a DNA amplification technique called Loop-Mediated Isothermal Amplification (LAMP) to detect different strains of pathogenic <em>E. coli</em>. Common visualization methods of LAMP amplicons include using LAMP reaction buffer containing a pH indictor dye. This …
Page 1 of 2