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 52 for “"AgNPs"”.
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Auxiliary Procedures for the AGNPS Model in Urban Fringe Watersheds
The Agricultural Nonpoint Source model (AGNPS) is a single-event grid-based model used for simulating runoff, sediment and nutrients from agricultural areas. This study involved using geographic information system (GIS) spatial data and functionality to improve the spatial and temporal assignment …
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Agricultural non-point source (AGNPS) water quality modeling in a GIS environment
… to undertake Agricultural Non-Point Source (AGNPS) water quality modeling. Three general areas of GIS technology were investigated consisting of technical issues involved in linking GIS; the model; database development; and a discussion of system performance from an institutional perspective.
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Green synthesis of silver nanoparticles using Moringa oleifera extracts and their evaluation against antibiotic resistant strains of escherichia coli and staphylococcus aureus
… study was to synthesize silver nanoparticles (AgNPs) using M. oleifera extracts and compare antibacterial activities of AgNPs prepared in M. oleifera extracts with AgNPs of common antibiotics (penicillin G and streptomycin) against antibiotic resistant strains of Escherichia coli and …
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Ecotoxicity of silver nanoparticles on estuarine and coastal bacterial communities
The increasing use of silver nanoparticles (AgNPs) as a biocidal agent and their potential accumulation in coastal environments may threaten non-target natural environmental bacterial communities. For this reason the main aim of this PhD project was to examine the effects of AgNPs on the …
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Exploration of a template-directed approach for the synthesis of silver nanoparticles
… one-pot synthesis of silver nanoparticles (AgNPs) using Tollens' reagent as a silver source. The project focuses on the preparation of a series of sugar triazole ligands to template the formation of monodisperse AgNPs in a size- and shape-controlled manner. Chapter 1 introduces the optical …
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An Evaluation of Coating Material Dependent Toxicity of Silver Nanoparticles
<p>Silver nanoparticles (AgNPs) synthesized using numerous types of coating materials may exhibit different toxicity effects. The study evaluated coating material dependent toxicity by selecting 3 types of AgNP synthesis methods with different coating materials (citrate, polyvinyl pyrrolidone, and …
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Effects of nanosilver and silver nitrate exposure on fathead minnows (Pimephales promelas) and zebrafish (Danio rerio)
Silver nanoparticles (AgNPs) due to their unique antimicrobial properties are among the most widely utilized nanoparticle. Because of the nature of the products that utilize AgNPs, environmental release of AgNPs is inevitable. At greatest risk is the aquatic ecosystem due to known toxicity of the …
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Polysulfone mixed matrix membranes with biosynthesis nanoparticles: enhancement of interface compatibility and antibacterial membrane seperation process
… effect of biosynthesis silver nanoparticles (bio-AgNPs) structure towards PSf membranes performance. The addition of bio-AgNPs in the membrane formulation was aimed to improve antibacterial properties and interface compatibility of the polymer mixed matric membrane. In this work, facile green …
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Assessing the Impacts of Silver Nanoparticles on the Growth, Diversity, and Function of Wastewater Bacteria
<p>Silver nanoparticles (AgNPs) are increasingly being integrated into a wide range of consumer products, such as air filters, washing machines, and textiles, due to their antimicrobial properties [1]. However, despite the beneficial applications of AgNPs into consumer products, it is likely that …
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Inhibitory effects of Green synthesized Senna alexandrina silver nanoparticles (SAAgNPs) on Escherichia coli DnaK
… viable production of silver nanoparticles (AgNPs) through their application in green synthesis. However, Plant-derived nanoparticles may potentially have unique physicochemical characteristics. This study is significant in that it contributes to the understanding of the effects of AgNPs on …
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Synthesis and Characterisation of Metallic Nanoparticles from Medicinal Plant Extracts and their Application in combating Antibiotic-Resistant Bacterial Pathogens
… to synthesise and characterise silver (SA-AgNPs) and gold (SAAuNPs) nanoparticles from S. africana extracts. Methods of characterisation included Ultraviolet-Visible spectrophotometry (UV-Vis), X-ray diffraction (XRD), Dynamic light scattering (DLS), Transmission electron microscopy (TEM), …
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Impact of metallic nanoparticles on anaerobic digestion
… AT AUTHOR'S REQUEST.] Silver nanoparticles (AgNPs) have been applied in various consumer products while nano zero valent iron (NZVI) has been proposed for site remediation and industrial wastewater treatment. In batch anaerobic digestion systems, AgNPs at the concentration of 40 mg/L did not …
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Silver Nanoparticles and the Plant-Associating Abilities of Rhizobiaceae Bacteria
… properties. Specifically, silver nanoparticles (AgNPs) can demonstrate distinct physiochemical properties compared to bulk silver, including a large surface area to volume ratio that allows for higher reactivity with bacterial cell surfaces. AgNPs are being released into the environment, …
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Nanoparticle toxicity and molecular mechanisms in fish: A case study with silver nanoparticles
… after incubation of polyvinylpyrrolidone-coated AgNPs (PVP-AgNPs, 50 nm) in fish (smallmouth bass) plasma. Both gender and length of incubation affected the types of proteins identified from PC. The most common proteins were related to immune function, red blood cell function and clotting, and …
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Towards Combined Computational and Experimental Studies on Toxicity of Silver Nanoparticles
… toxicity studies of silver nanoparticles (AgNPs). Toxicity of 10 nm citrate stabilized AgNPs on HepG2 cells were investigated. Experimental results show that the 10 nm citrate stabilized AgNPs begin to be toxic to HepG2 cells at a dosage that exceeds 1 ppm and LD50 was observed at 3 ppm. …
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Investigating the cellular toxicology of silver nanoparticles using a single-cell, mitosis-focused approach
… the toxicity of silver nanoparticles (AgNPs) on immortalized human retinal pigmented epithelial (RPE-1) cells. AgNPs are a major nanomaterial employed in product manufacturing due to desirable antimicrobial properties, yet toxicity reports are still confounding. RPE-1 cells were …
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Controlled Evaluation of Silver Nanoparticle Dissolution: Surface Coating, Size and Temperature Effects
… in many published studies. Silver nanoparticles (AgNPs) represent one of the most widely manufactured nanomaterials. They are currently being incorporated into a wide range of consumer products due to their purported antimicrobial properties. However, either the AgNPs themselves or dissolved Ag+ …
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Development of chitosan/alginate/silver nanoparticles hydrogel scaffold for soft tissue engineering applications
… incorporated with silver nanoparticles (AgNPs) with enhanced mechanical properties and biosafe function is proposed. Different ratios of chitosan/alginate (Chi/Alg) were prepared and the effect of different ratio (1:1, 1:2 and 2:1) to the mechanical, biological properties with and without …
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Controlled Evaluation of Silver Nanoparticle Dissolution Using Atomic Force Microscopy
Incorporation of silver nanoparticles (AgNPs) into an increasing number of consumer products has led to concern over the potential ecological impacts of their unintended release to the environment. Dissolution is an important environmental transformation that affects the form and concentration of …
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Nanoparticle Encapsulation and Aggregation Control in Anti-reflection Coatings and Organic Photovoltaics
… such as anisotropic silver nanoplates (AgNPs), provides large local field enhancements and in coupling with the active layer, substantial optical absorption improvements can be realized. AgNPs were first integrated into the hole-transport layer (PEDOT:PSS) by ISAM deposition. Here, …
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