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 19 of 19 for “"microbial inactivation"”.
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Kinetic Modeling of Microbial Inactivation by Ultraviolet Light
Ultraviolet (UV) light reactors are currently being designed for the disinfection of water and wastewater. However, little information is available relating the effects of mixing, light intensity, reaction time, and water quality to UV disinfection efficiency. This study was designed to develop …
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Manothermosonication (MTS) treatment of apple-carrot juice blend: effect on inactivation of Escherichia coli O157:H7 and quality attributes during storage
… the effect of manothermosonication (MTS) on microbial inactivation and the quality of apple-carrot blended juice during storage. To examine the effect of MTS on quality of apple-carrot blended juice samples treated with MTS and high temperature - short time (HTST) was examined during a 3-week …
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Feasibility of semi-continuous solar disinfection system for developing countries at a household level
… as it is technically simple, effective at microbial inactivation as measured by the E.coli indicator organism, can be made from locally available materials and is economical. Preliminary feedback from locals show SC-SODIS is socio-culturally acceptable. Limited time did not allow study of …
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Aerosol Route Synthesis and Applications of Doped Nanostructured Materials
… based on the oxidation state of the dopant. The microbial inactivation effectiveness of as-synthesized nanomaterials was investigated under different light irradiation conditions. Microbial inactivation was found to strongly depend on the light irradiation condition as well as on material …
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Spirasol : improvements to semi-continuous solar disinfection water treatment systems
… The study primarily focused on the comparison of microbial removal levels in the Spirasol system and the more traditional solar disinfection method called SODIS that uses a Polyethylene Terephthalate (PET) bottle. To address microbial removal capacity, the two systems were assembled and tested in …
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Antimicrobial mechanism of action of ultrasound technology : a macroscopic, genetic and transcriptomic perspective for the disinfection of (waste)water
… is the characterisation of the mechanisms of the microbial responses of E. coli K-12 and selected E. coli K-12 isogenic mutants under ultrasound treatments. The aim of this work is to identify the genes that play a crucial role on the stress response of wild types and their specific responses …
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Effect of Fat Content and Food Type on Heat Transfer during Microwave Heating
… food materials in a microwave field and microbial inactivation during microwave cooking. Recent research showed that fat content in muscle food plays an important role in microbial inactivation by increasing the inactivation level with an increase in the fat level. It was also …
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Investigation of ultrasonic pressure distribution in a sonoreactor and a washing tank by FEM simulation
… at two different L values with the result of a microbial inactivation test conducted in the same sonoreactor for each L value when treated by mano-thermo-sonication in a batch operation. The acoustic pressure field between two transducer boxes in a custom-made ultrasound-assisted washing tank …
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Quality improvement of manuka honey through the application of high pressure processing
… compressibility has a significant role in the microbial inactivation.
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An investigation into the use of High-Intensity Narrow Spectrum light as a decontamination technology
… being sought. This investigation examined the inactivation efficacy of High-Intensity Narrow Spectrum Light (HINS-light) on a wide range of microorganisms using LED arrays that emitted intense 405-nm light. The theorised inactivation mechanism involves 405-nm stimulation of endogenous …
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Effects of combined high hydrostatic pressure and dense phase carbon dioxide treatments on inactivation of enzymes, microorganisms and sensory properties of different products
… Dense- Phase Carbon Dioxide (DPCD) treatment on inactivation of fruit enzymes: peroxidase (POD), polyphenoloxidase (PPO) and pectinmethylesterase (PME) of feijoa, inactivation of microorganisms in their growth media and sensory properties of treated feijoa products. The changes in pure PPO …
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High hydrostatic pressure inactivation of Bacillus subtilis var. niger spores : the influence of the pressure build-up rate on the inactivation
… to evaluate the impact of high pressure on the inactivation of bacterial populations. From the results kinetic models should reliably predict inactivation under dynamic conditions. High pressure processes imply an initial phase of pressure build-up, accompanied by a temperature increase due to …
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Preparation of juice concentrates by nonthermal processing technologies: a multiple hurdle approach
… refrigerated storage for six months. Lastly, microbial inactivation studies were conducted using high pressure processing at 600 MPa for 3 min (HPP) and high pressure homogenization at 300 MPa (HPH) to extend the refrigerated shelf-life of the juice. Concord grape juice concentrate was …
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DISINFECTION USING A NOVEL HETEROGENEOUS CATALYST
… and the time taken for disinfection. The antimicrobial properties of an iron based novel heterogeneous polyacrylonitrile catalyst (PCat) were examined against Escherichia coli ATCC 10536, Pseudomonas aeruginosa ATCC 15442 and Staphylococcus aureus ATCC 6538 using a modified version of the …
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Optimization of the Quality and Safety of Cooked Seafood Products
… parameters that optimize both the quality and microbial safety of the products. To achieve these goals, this study develops mathematical models for the inactivation of Salmonella sp., change in quality attributes, and the product heating profiles during the cooking process for shrimp and …
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Effect of Standard Post-harvest Interventions of Fresh Vegetables on Bacterial Community Dynamics, Pathogen Survival and Antibiotic Resistance
… consumption, in part due to lack of a microbial inactivation step before consumption. Raw manure or improperly composted manure applied as soil amendments is an established source of pathogenic bacterial contamination. However, less is known about whether such soil amendments could …
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Thermal Modeling of Vacuum Assisted Steam Pasteurization for Improved Product Safety of Low Water Activity Foods
… package to be predicted accurately. A dynamic inactivation model was developed to predict the time needed for reduction of the bacteria Enterococcus faecium (E. faecium) on whole macadamia nuts and was used to predict the inactivation of E. faecium on macadamia nut pieces and pumpkin seeds …
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Exploring milk management strategies for improved food safety and health outcomes in the neonate
… medical outcomes. The nutritional, bioactive and microbial properties of milk can be influenced by an array of extrinsic and intrinsic factors. This thesis investigates the influence of two common management practices of milk, in both the bovine and human context, and their subsequent influence on …
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Investigating variables affecting heap (bio)leaching through determining access to sub-surface mineral grains by micro-scale X-ray tomography
… and around the particles, chemical reactions, microbially-mediated reactions and microbial growth. Contact of leaching solution with mineral grains is necessary for oxidation of the sulphide minerals. However, a large fraction of the mineral grains is positioned below the surface of the ore …