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 131 for “"microbial growth"”.
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Microbial Growth On Anthropogenic Compounds By Reductive Dehalogenation Or Oxidation
… their genomes shows metabolic specialization for growth by reductive dehalogenation. Their genomes were larger then Dehalococcoides spp. genomes but smaller then the nearest sequenced phylogenic relative, further indicating specialization. The process of reductive dechlorination does not …
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Development and evaluation of novel antimicrobial solutions against biofilms and planktonic microbial growth
… approach to test the efficacy of three novel antimicrobial solutions. Each solution is compiled of three reagents; Ethylenediaminetetraacetic acid (EDTA), hydrogen peroxide, and ethanol, were used against planktonic (free-floating) microorganisms and biofilms (aggregated microorganisms). The …
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Statistical Evaluation of the Factors causing Microbial Growth in Point-of-use Filters
… of POU filter could possibly lead to the growth of bacteria inside the filters, which could lead to health concerns. Therefore, the potential effects of POU filters on microbial growth was investigated. To explore the cause of filter effects on microbial growth, a sampling campaign was …
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Corrosion in New Construction:Elevated Copper, Effects of Orthophosphate Inhibitors, and Flux Initiated Microbial Growth
… plumbing systems. These include 'blue water', microbial infestation, and rapid loss of disinfectant residual, among other things. Frequently cited causes of the problems include metallic fines left in the plumbing lines from deburring, cutting and product fabrication; solder flux residuals …
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The Prevalence of Microbial Growth in Enteral Tube Feeding in Two North Central Hospitals
… with oral intake. The ETF solution may support microbial growth when this growth is introduced into the ETF delivery system. Adverse patient conditions have been associated with large amounts and/or unacceptable types of microbial growth in ETF. This study investigated the prevalence of …
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Effect of storage temperature and duration on physico-chemical properties, microbial growth and nutritional composition of papaya and banana fruits
Kultivar pisang (Musa sp.) dan betik (Carica papaya) dituai dan disimpan selama sebulan pada suhu penyimpanan dan jangka masa berbeza. Buah-buahan ini diambil daripada kebun yang terletak di Johor Bahru, Malaysia. Masak dalam tempoh yang tidak diingini, perubahan warna kulit, penurunan berat, …
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A Framework for Controlling Opportunistic Pathogens in Premise Plumbing Considerate of Disinfectant Concentration x Time (CT) and Shifts in Microbial Growth Phase
… line is sometimes insufficient to suppress OP growth. Conditions encountered in premise plumbing can further diminish disinfectant in water after it crosses the property line. This dissertation examines how multiple factors at play in drinking water distribution systems and premise plumbing …
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Impact of Microbial Inhibitors on the Nutritive Value of and Microbial Growth in Alfalfa Hay Containerized for Exported from the Humid Eastern U.S.
The arid conditions found in the west allow for the production of high quality hay for export. However, hay production in this region is highly dependent upon irrigation. There is significant interest in developing a hay export market in the eastern U.S. Therefore, a greater understanding of the …
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Comparison of optical density, total cell protein, and number of viable cells (via fluorescent straining) as measures of microbial growth kinetics in suspended and biofilm cultures during biodegradation of naphthalene
Most studies on bacterial growth kinetics have been dependent on theoretical modeling with general biomass measurements using either dry weight or optical density (OD), without distinguishing live from dead bacteria or debris. As a result, there remains considerable uncertainty in reliably …
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The Effects of Solutes, Polymers and Their Mixtures on Mold Conidia Germination
… was long held to be the primary predictor of microbial activity in food systems. Recently, it was shown that different components present in food systems also influenced microbial growth and the minimum Aw at which microbial activity occurred. Thus, water activity alone is not a sufficient …
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Investigating the impact of microbial interactions with geologic media on geophysical properties
… study were to investigate the effect of: (1) microbial metabolic byproducts, microbial growth, and biofilm formation on the low frequency electrical properties of porous media, (2) biofilm formation on acoustic wave properties, and (3) the natural electrical (self-potential) signatures …
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A study of nitrate versus oxygen respiration in the activated sludge process
… have many advantages, but little is known about microbial growth and substrate removal when nitrate respiration is employed. The primary objective of this study was to evaluate and compare microbial growth and biokinetic coefficients in an aerobic and an anoxic (anaerobic with nitrate as the …
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Growth of mixed cultures of moderate thermophiles for commercial heap bioleaching of low-grade copper-sulphide ores
… heap requires a fundamental understanding of microbial growth on the ore at different temperature ranges. Furthermore, successful preparation and maintenance of suitable inocula also requires an understanding of culture conditions that could affect the micro-organisms in the stock cultures. …
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The effect of chaotropic magnesium chloride on the growth of microbes
… solutes that is not expected to support growth above 2.3 M, but few studies have focused on the effects of MgCl₂ on microbial growth. This study investigated the effects of MgCl₂ in comparison to kosmotropic sodium chloride (NaCl), on microbial growth and community composition, with the …
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The Characterization of Biofilm Attachment to Metal Interfaces: Effects of Substratum Properties
… have a significant impact on biofilm growth. To research this hypothesis, protocol was established in order to produce, analyze, and study biofilms in a static exposure system. Though simple, the static bioreactor was proved to be adequate for inducing microbial attachment to processed …
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An investigation of the kinetics of thermophilic microbial ferrous iron oxidation in continuous culture
… and is understood to be achieved largely by microbial action. The objective of this work was to determine an appropriate set of kinetic expressions that describe the rates of microbial growth and ferrous iron oxidation of a thermophilic archeal culture grown in continuous culture on ferrous …
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Some aspects of the microbiological properties of polymers and composite materials
… was not previously associated with substantial microbial growth, small amounts of microbial activity would pose problems for products associated with comestible materials. The microbiology of the raw materials was investigated, two ingredients were supportive to microbial populations whilst five …
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Microfiltration of Synthetic Metal Working Fluids Using Aluminum Oxide Membranes
… build-up in the MWF. Microbiological population growth can grow to potentially hazardous levels in extremely short time-scales. Membrane filtration systems designed to control microbial populations must remove microbes from the MWF at a rate faster than population growth. A model is developed to …
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The effect of carbon dioxide on the growth and activity of leptospirillum ferriphilum
Microbial oxidation rates catalysed by the acidophilic micro-organisms mediating mesophilic and thermophilic bioleaching of mineral sulphides have been well characterised under conditions typical of active tank leaching processes in the mineral industry. However, with the increasing need to …
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Growth probability of Escherichia coli O157:H7 and Listeria monocytogenes in packaged fresh-cut romaine mix at fluctuating temperatures during simulated transport, retail storage and display
… sale of leafy greens negatively impacts both microbial safety and product quality. Consequently, the effect of fluctuating temperatures on Escherichia coli O157:H7 and Listeria monocytogenes growth in commercially bagged salad greens was assessed during transport, retail storage, and display. …
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