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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 15 of 15 for “"PLFA"”.
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Low Dose, Low Disturbance: PET and PLA Microplastics Show Limited Effects on Soil Microbes via PLFA Analysis
… dark conditions. Phospholipid fatty acid (PLFAs) biomarkers were used to identify and evaluate soil microbial biomass and community composition in the presence and absence of plastics. In general, our observations show that fungal biomarkers continuously decreased irrespective of …
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Biofilm development in streams draining from contrasting land use systems.
… and nitrogen biomass, phospholipid fatty acids (PLFA) from the biofilms were looked at. Along with a total concentration of fatty acids, PLFA also give a microbial profile. In the first experiment, the total PLFA concentration showed that the mature forest had the highest PLFA concentration in …
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Bacterial communities in glacier forefields of the Larsemann Hills, East Antarctica : structure, development & adaptation
… of the cell membrane phospholipid fatty acid (PLFA) inventory of an isolated bacterium in response to 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 …
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Soil organic matter dynamics in a temperate forest influenced by extreme weather events
… neutral sugars and phospholipid fatty acids (PLFA) as measure for microbial biomass. Amounts of lignin contents were not significantly affected by repeated freeze/thaw cycles. However, intensive frost slightly enhanced lignin mobilization in the O layer and the translocation into the B …
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HIGH STRENGTH COLD ROLLED ASPHALT SURFACE COURSE MIXTURES
… and gelenite content, Poultry Litter Fly Ash (PLFA), which has high alkali components, Silica Fume (SF), and Rice Husk Ash (RHA), which is high silica content and cost-plus material, collectively instead of conventional mineral filler. In addition, besides the production of the new high-quality …
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Examining the effect of rotation sequence on biological nitrogen fixation of pulse crops
… biomass carbon (C) and phospholipid fatty acid (PLFA) biomarker results, where levels of each were higher in soil from pulse crops grown on oilseed stubble at Davidson, Theodore, and Springside. Climatic conditions also may have affected BNF at each location, especially in 2018, as conditions …
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Soil microbial community dynamics in response to cover crop implementation and P fertilizer management
… N. For the second objective I found that PLFA microbial biomass decreases with increasing depth, and that cover crops can significantly increase microbial biomass in several PLFA categories when compared to plots with no cover crop in a no-tillage system with a corn-soybean rotation. The …
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The microbial communities and nutrient availability in pre and post harvested lodgepole pine stands of west-central Alberta
… microbial communities. Phospholipid fatty acid (PLFA) analysis provides information about the physiological characteristics of the microbial community. Analysis of the PRS probes results varied for the two nutrients: phosphorus (P) and nitrogen (N). Nitrogen availability was determined by …
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Targeted short-term nutrient reduction to manage Ventenata dubia an invasive winter annual grass: soil and plant responses
… 2%. The soil microbial community, determined via PLFA and NLFA analysis, was largely unchanged at the end of the season with slightly higher bacterial biomass and, importantly, no reduction in AMF abundance. These results suggest that this method has few negative impacts on the plant and soil …
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Impact of mycorrhizal fungi and nematodes on growth of Andropogon gerardii Vit., soil microbial components and soil aggregation
… Phospholipid and neutral lipid fatty acid (PLFA and NLFA) analysis were determined for both soil and roots. Water-stable aggregates were separated using a modified Yoder wet-sieving apparatus and analyzed for mass, total C and N, and the isotopic composition of C. There was a positive …
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Buried Surface Horizons in Saskatchewan Croplands Provide Insight into Microbial Soil Carbon Cycling and Development of Persistent Organic Matter
… was reduced in Ahb vs. Ah horizons (Total PLFA: Ah = 77.2 nmol g-1 soil, Ahb = 26.8 nmol g-1 soil), however enough viable biomass remained to suggest microbial C cycling was still occurring in Ahb horizons. Over the course of a 100-day controlled incubation experiment, the susceptibility of …
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The physiological characterisation of a novel Thermomicrobia strain WKT50.2, and a review of the characteristics of the class Thermomicrobia
… temperature and pH range and optima, analysed PLFA, and determined preferred carbon and energy sources, N-fixation, modes of growth and antibiotic sensitivity. As a general phenotype, WKT50.2 is a heterotrophic and thermophilic obligate aerobe with a preference for moderately alkaliphilic pH …
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Assessing the role of probiotics for the enhancement of soil quality under cover crops
… were analyzed using phospholipid fatty acid (PLFA) analysis. Standard enzyme assays were used to analyze B-glucosidase, fluorescein diacetate hydrolase (FDA), dehydrogenase (DHA) and B-glucosaminidase activities. Total fungi biomass was highest in Trt3 followed by control, Trt1 and Trt2. …
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Metabolic Pathways of Amino Acids, Monosaccharides and Organic Acids in Soils assessed by Position-Specific Labeling
… cellular compounds (phospholipid fatty acids (PLFA) and amino sugars) was determined by bulk and compound-specific C-13 analyses. Therefore, a new instrument coupling, an ion chromatograph with an isotope ratio mass spectrometer (IC-O-IRMS), and the respective methods for amino sugar analysis …
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Microbial Regulation of Soil Greenhouse Gas Emissions in a Non-Bloat Legume Grazing System
Cattle pastures are a source of greenhouse gas (GHG) emissions, including enteric methane from ruminating cattle, carbon dioxide (CO2), and nitrous oxide (N2O) from microbial respiration of soil carbon (C) and nitrogen (N). Producers may introduce non-bloat legumes to cattle pastures to improve …