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 216 for “"Microbial activity"”.
-
Light hydrocarbon ratios as biosignatures of microbial activity
… expanses of anoxic mudflats, referred to as a “microbial observatory”. Methane and ethane emissions were characterised over three sites spanning from the head of the estuary (Hythe), mid-estuary (Alresford) and the mouth (Mersea) which were sampled for dissolved hydrocarbons, in-situ fluxes, and …
-
Functional characterization of the microbial activity of field site sulfate reducing bioreactors
Includes bibliographical references (pages 101-106).
-
Enhanced Microbial Activity and Energy Conservation through Pneumatic Mixing in Sludge Systems
The primary goal of this study was to evaluate a new device and system, designed to optimize the performance of standard low pressure air diffusers in two types of aerated systems (activated sludge and aerobic sludge digestion) and to decrease overall energy consumption. Aerated treatment systems …
-
Determining the impact of carrion decomposition on soil microbial activity levels and community composition.
… useful for forensic investigators. Advances in microbial profiling techniques have made it possible to compare microbial community profiles obtained from evidence or crime scenes to individuals and vice versa. Profiling microbial communities associated with cadaver decomposition may provide …
-
Microbial Activity during Biodegradation and its Effects on Groundwater Velocity in a Contaminated Aquifer
… of the release, O2 was added to stimulate microbial activity and biodegradation in the aquifer. Changes in groundwater velocity associated with biological activity, were measured with point velocity probes (PVPs) arranged into multilevel standpipes and installed into the flow gate. PVP …
-
Impacts of microbial activity on trace metal behavior during the bioremediation of phenanthrene-contaminated soils
A novel method for the bioremediation of phenanthrene using the fungus Penicillium frequentans was utilised to remove phenanthrene (200 mg kg\(^{-1}\)) from soil containing both metals and phenanthrene, over 29 days. Bioremediation of phenanthrene and its effects on trace metal behaviour has been …
-
Liberation of low molecular weight organic acids from sedimentary organic matter and their role on microbial activity
… and acetate are the most common LMWOAs used for microbial metabolism. In terrestrial mud volcanoes (TMVs), sedimentary material is rapidly ascending from great depth to the surface. Therefore LMWOAs that were produced from buried macromolecular organic matter at depth are also brought up to the …
-
Microbial activity on wood in streams: exploring abiotic and biotic factors affecting the structure and function of wood biofilms
In this examination of microbial colonization of wood and factors affecting the structure and function of wood biofilms in streams, the first two chapters summarize research conducted in New Zealand and compare the composition of biofilm colonizing wood to that colonizing rocks and leaves. Similar …
-
The individual and simultaneous effects of Cu and cypermethrin upon glycosidase, phosphomonoesterase and the total microbial activity of soil.
Enzymatic and microbial assays are frequently used in the determination of the response of soil organisms to external pollutants. Enzymes and soil microorganisms are particularly used as bioindicators to determine the health and quality of soil following a chemical disturbance. This study chose β- …
-
Copper from copper hydroxychloride in diets for growing pigs increases feed efficiency, improves energy utilization and changes intestinal microbial activity
… digestibility of nutrients, intestinal microbial protein, immune response, intestinal permeability, and lipid metabolism of pigs. The first 3 experiments were conducted to determine effects of Cu hydroxychloride on digestible energy (DE) and metabolizable energy (ME), apparent total …
-
The Effects of Solutes, Polymers and Their Mixtures on Mold Conidia Germination
Water activity (Aw) 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 …
-
Microbial responses to plant functional types and historical resources additions in the shortgrass steppe
… the long-term effects of these additions on soil microbial activity and nutrient cycling. In addition, microbial activity may be affected by plant functional types (PFT) through influence on the levels of inorganic nitrogen (N) and labile carbon in the rhizosphere. This is particularly important …
-
Studies of the interactions of CCA and ACA preservative treated wood with soil
… associated with a reduction in dehydrogenase activity around the preservative treated material compared with levels around the untreated blocks, though activity around the treated wood was rarely less than background levels. Relatively large arsenic concentrations accumulated around the most …
-
Fates of spilt oil and factors affecting the bio-degradation of oil: a review
… to occur; otherwise inhibition of microbial activity is observed. The microbial activity is dependent on the type of the microbes present. The interfacial area of oil and water is also an important factor which varies significantly with variation in water saturation. The degree of …
-
Microbial communities, activities, and metabolisms in Earth’s subseafloor and analog oceanic environments
… the functional dynamics of these subseafloor microbial communities remains unresolved. This thesis investigates how geochemical conditions shape microbial activity and physiology in subseafloor fluids from basalt- and ultramafic-hosted environments. The first part of the thesis uses stable …
-
Quantification of total microbial biomass and metabolic activity in subsurface sediments
Metabolically active microbial communities are present in a wide range of subsurface environments. Techniques like enumeration of microbial cells, activity measurements with radiotracer assays and the analysis of porewater constituents are currently being used to explore the subsurface biosphere, …
-
Nitrogen uptake patterns by snow addition in a sub-Arctic dry heath tundra ecosystem
… such as water content, soil temperature, microbial activity, and nutrient availability and investigated their implications for plant water availability and nitrogen cycling processes. Through snow fence experiments and 15N isotope labelling and simulations of carbon fluxes with the …
-
Organic influences on hydrated magnesium carbonate mineral formation
… and preserve textural and chemical evidence of microbial activity early in the geologic record of Earth. For this reason, magnesium carbonates thought to be associated with lacustrine deposits in Jezero Crater are an important target of the Mars Sample Return Mission. The presence of hydrated …
-
The effects of cattle exclusion on stream structure and function
… lead to alterations of macroinvertebrate and microbial activity. Recently government programs, such as the Conservation Reserve Enhancement Program (CREP), have provided funding for farmers to exclude cattle from streams and riparian zones. Funding for CREP is limited and does not allow for …
Page 1 of 11