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 25 for “"microbial community dynamics"”.
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Soil microbial community dynamics associated with agricultural crops
… that occur between agricultural crops and microbial communities that reside in the soil. Soil microbes regulate the decomposition of organic matter, the cycling of nutrients to crops and can induce systemic resistance. They also drive global biogeochemical cycles that influence the climate, …
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Soil Microbial Community Dynamics In Florida Scrub Ecosystem
… short- and long-term fire effects on the soil microbial community. Fire effects were studied in a chronosequence, comprising a recently burned scrub during a winter-prescribed fire to scrub where fire did not occur for 40 years. The number of culturable cells was reduced by two orders of …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
… environmental and management factors affect the microbial communities responsible for biofilter functional. To do so, we employed two different approaches. First, in our spatial study we sampled one biofilter over the course of an afternoon in 2007 to determine how total and denitrifying …
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Soil microbial community dynamics in response to cover crop implementation and P fertilizer management
… (N) soil health metrics; (ii) to explore the microbial community structure using phospholipid fatty acid analysis, and (iii) to identify key microbial functional gene composition, and soil health metrics relate to key soil microbial functional gene composition in the fall 2019 and spring 2020 …
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Performance, denitrification activity, and microbial community dynamics of denitrifying biofilters under fluctuating water level
… fields. A better understanding of the microbial communities that allow the biofilter to function may provide insight to improve performance. Two studies were performed to achieve this aim. Laboratory-scale biofilters were operated for two years with variations in water level. Nitrate …
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Effect of organic nutrient perturbation on microbial community dynamics and composition in Scottish coastal waters
… of organic nutrient perturbation on the<br/>dynamics of marine microbial communities, adopting three different approaches. A field study was conducted on the west coast of Scotland, in two contrasting locations, including a fish farm anticipated as a point source of organic nutrients. Data …
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Production of biogas from sugarcane wastes: an assessment of microbial community dynamics for an efficient process
… of biogas production from sugarcane wastes, the microbial community dynamics of laboratory-scale reactors were assessed under different start-up strategies. Despite the promising results of the methane potential for all the waste products, chemical and physical pre-treatments were applied …
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EFFECTS OF PLANT GROWTH-PROMOTING MICROORGANISMS ON MICROBIAL COMMUNITY DYNAMICS AND PLANT GROWTH RESPONSES OF AEROPONICALLY CULTIVATED SPINACH
<p>Regional food insecurity caused by the inability to use conventional farming techniques year-round in cold climates increases the need for access to quality, locally sourced, and affordable foods year-round. Shifting from a soil-based system to aeroponics can increase yields, as aeroponic …
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The feasibility and microbial community dynamics of using down flow hanging sponges (DHS) reactor in treating high strength soft drink wastewater
… operation over 700 days. At the same time, the microbial compositions were characterized and related to reactor performance. Synthetic wastewater at a concentration of 3000 mg/L chemical oxygen demand (COD) was directly fed to two identical DHS reactors operated in parallel. The effluent from …
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Linking microbial community dynamics and performance of a biological sulphate reducing system using a mixed volatile fatty acid stream as electron donor
… of carbon source and electron donor and the microbial communities present influence the sulphate reduction process, the former frequently defining technoeconomic feasibility. The feed sulphate concentration and residence time, together defining the volumetric sulphate loading rate, have also …
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An investigation into the relationship between process kinetics and microbial community dynamics in a lactate-fed sulphidogenic CSTR as a function of residence time and sulphate loading
… choice of electron donor, constituents of the microbial populationmediating the process, the feed sulphate concentration and other operationalparameters. The current work investigated the potential of an ecological approach inthe treatment of sulphate-laden wastewaters. This was based on the …
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Effects of Microbial Community Stress Response and Emerging Contaminants on Wastewater Treatment Plants
… is essential. The research herein assesses microbial community dynamics of the response of nitrifying microorganisms in activated sludge to variation in ammonia concentration and evaluates the impact of engineered nanoparticles on activated sludge microbial communities and other emerging …
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Assessment of a Passive Sampler for Aquifer Microbial Community Profiling and Comparison of Porous Media
… aquifer depletion; however, its impact on native microbial communities remains insufficiently characterized. Concerns include the potential introduction of pathogens, antibiotic resistance genes (ARGs), and trace organic pollutants, as well as the disruption of native microbial processes critical …
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Relationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped System
… soil properties including temperature, moisture, microbial abundance and activity, and other soil physical and chemical properties. Changes in these factors can result in high spatial and temporal variability of total soil CO2 efflux. Low molecular weight organic acids (LMWOAs), dissolved organic …
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Understanding microbial communities through horizontal gene transfer
Microbial communities represent the majority of biodiversity on Earth and underpin key ecosystem functions. Motivated by the experimental observation that communities from garden composts were capable of maintaining high diversity in single-carbon-source microcosms, I started by tracing the …
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Advancing Polycyclic Aromatic Hydrocarbon Bioremediation using Genetic Bioaugmentation in Soil Microbial Communities
… compounds are carcinogenic and disrupt soil microbial processes essential for ecosystem functions. Bioremediation, which uses microorganisms to degrade pollutants, can be applied to ameliorate contaminated environments. However, biodegradative functions are often limited because exogenous …
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Investigating virus-host interactions in a changing Arctic Ocean
… sea ice loss, warming and freshening affecting microbial community dynamics, including primary productivity. In the Arctic, primary production is driven by eukaryotic phytoplankton and one picoeukaryote in particular, Micromonas polaris, is ecologically dominant. Basic knowledge of the spatial …
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Develop a Sulfur-driven Autotrophic Denitrification Process for The Treatment of Industrial Wastewater Containing High Levels of Salinity in an Alkaline Environment
… proteomics analyses were conducted to understand microbial community dynamics and their roles in the SdAD system. These analyses revealed that Proteobacteria and Bacteroidota dominated at the phylum level. The critical species from Halomonas, Thiobacillus, and Rhodanobacter show a strong positive …
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Impacts of mucins on microbial physiology and interactions
… and urogenital tracts. Despite the enormous microbial population inhabiting the body, some of which are opportunistic pathogens, most people harbor these organisms without showing any signs of disease. The mucus that covers the wet epithelium and houses the microbiota is a prime candidate for …
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Effects of seasonal changes on the depletion of microflora in natural wetlands in Northern KwaZulu Natal
… Various physiochemical parameters and microbial communities were evaluated at Lake Cubhu to determine the effects of seasonal changes on the microbial community structure of this lake. Lake Cubhu wetland is a sub-catchment within the Mhlatuze catchment and it is surrounded by various …
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