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 11 of 11 for “"extracellular enzyme activity"”.
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Landscape history and contemporary environmental drivers of microbial community structure and function
… potential of the microbial community using extracellular enzyme activity assays. Microbial communities were influenced by geochemical differences among both tills and local environments, but especially organized by variables associated with water availability as the first axis of an NMDS …
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Effects of road salt on photosynthetic and enzyme activity of stream biofilms
… influence on periphyton. I measured extracelluar enzyme activity and photosynthetic activity of natural winter stream periphyton communities under various short-term laboratory salt exposures. The results of this study suggest that short-term exposure to increased concentrations of salt did not …
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Bacterial Assemblages And Microbial Enzyme Activity In The Major Tributaries Of The Lower Mississippi River
… function of these communities using assays of extracellular enzyme activity. A total of 715,120 valid bacterial 16s rrna sequences were classified into 30,211 operational taxonomic units (otus), although many of these otus were of very low proportional abundance. The most abundant individual …
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Microbial activity on wood in streams: exploring abiotic and biotic factors affecting the structure and function of wood biofilms
… were also present. An assay of microbial activity (¹⁴C glucose uptake) indicated that surface biofilms were more active than biofilms on buried wood. There was no relationship between ¹⁴C glucose uptake and stream pH indicating that acidity did not affect wood biofilm activity in these …
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A multi-disciplinary approach to the characterization of waterlogged burial environments : assessing the potential for the in situ preservation of organic archaeological remains
… integrated with a study of the composition and activity of the microbial community.Soil cores were taken from two wetland sites located in the Humberhead Levels in Yorkshire: Hatfield Moor and Sutton Common. Cores were subsampled at depth intervals down to 100 cm depth, to allow for the …
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The influence of current year fire on leaf litter decomposition rates and microbial enzyme activity in forests undergoing ecological restoration
… of leaf litter, nutrient cycling, and microbial activity. This study compared leaf litter decomposition rates of six tree species (Quercus stellata, Quercus falcata, Quercus alba, Carya tomentosa, Liquidambar styraciflua, and Ulmus alata) ranging from those characteristic of historical open oak …
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Microbial Regulation of Soil Greenhouse Gas Emissions in a Non-Bloat Legume Grazing System
… alter soil microbial community structure, activity, and N2O emissions. Grazed pastures with introduced Veldt cicer milkvetch and common sainfoin were surveyed for differences in GHGs, microbial community structure, and extracellular enzyme activity for two growing seasons. Seasonal shifts …
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The effects of hydrology and vegetation on microbial community structure and soil function in the sediments of freshwater wetlands
… Orange Direct Count), and soil function (Extracellular Enzyme Activity (EEA)). A mixed-effects repeated measures analysis of variance (ANOVA) was used to better understand how each variable responded within each hydrological regime and treatment. Principal component analysis (PCA) and …
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Soil microbial response to land management practices and wildfire in Appalachian ecosystems
… ecosystems is critically controlled by the activity of soil microbial communities. Understanding how soil microbial communities change as a result of different land management practices or natural disturbances can provide insight into the effects of these perturbations on ecosystem health, …
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Soil Respiration and Decomposition Dynamics of Loblolly Pine (Pinus taeda L.) Plantations in the Virginia Piedmont
… including litter quality, microbial biomass, and enzyme activity and 3) evaluate the sensitivity of sources of RH (mineral soil-derived heterotrophic respiration; RHM, and leaf litter-derived heterotrophic respiration; RHL) to varying soil and litter water content over the course of a dry down …
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Bacterial communities in glacier forefields of the Larsemann Hills, East Antarctica : structure, development & adaptation
… temperature and pH fluctuations and by measuring enzyme activity at low temperature in environmental soil samples. The two studied glacier forefields are extreme habitats characterised by low temperatures, low water availability and small oligotrophic nutrient pools and represent sites of …