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 58 for “"soil microbes"”.
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Efforts Toward Production of Novel Natural Products From Uncultured Soil Microbes
… any given environment. It is estimated that, in soil, greater than 99% of the bacteria present are recalcitrant to culture. This poses a challenge for the field of natural product discovery, considering the traditional route to small molecule discovery from soil bacteria is to organically extract …
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Community Ecology Of Soil Microbes In Southeast Usa Oak-Pine Woodlands
Soil microbial communities can have important effects on plant growth and plant community ecology; however, the relationships between trees and soil microbial communities are still relatively poorly understood. Here i examine several of these relationships. Chapter 1 examines how ecological …
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An evaluation of co-culture parameters effecting antibiotic production in soil microbes
… derive from secondary metabolites produced by soil microbes in pure culture, but recent genetic evidence suggests that microbes can produce more secondary metabolites than are currently observed. The modified crowded plate technique directly identifies antibiotic-producing soil microbes that …
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Invasive lespedeza cuneata and its relationship to soil microbes and plant-soil feedback
… of exotic plants. Interactions with the soil microbial community can also increase invasiveness through plant-soil feedback, which occurs through shifts in the abundance of beneficial and deleterious organisms in soil that influence the growth of conspecific and heterospecific progeny. …
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Low Dose, Low Disturbance: PET and PLA Microplastics Show Limited Effects on Soil Microbes via PLFA Analysis
<p>Observations of microplastics in terrestrial soils are increasing and their potential effects on soil microbial communities (and/or their diversity) are poorly understood. To understand how microplastics may affect soil communities, we performed a microcosm study using soil collected from a …
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Abiotic and Biotic Factors Shaping Plant-Microbe Interactions
Symbioses between plants and soil microbes can shape plant traits and performance, population dynamics, community composition, and ecosystem function. However, the context-dependency of plant-microbe interactions remains an underexplored frontier of scientific understanding. Given that the biotic …
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Utilization of aqueous product generated by hydrothermal carbonization of waste biomass
… crop production was evaluated through studies of soil microbial effects and impacts on seed germination and early plant growth. These studies confirmed bio-toxicity effects of HTC filtrate on agricultural soil microbes at high application rates. On the other hand, lower rates of application …
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Degradação microbiana de ácido cítrico em solo contaminado por chumbo
… The low solubility of natural Pb ion in the soil, appears as a major impediment programs bioremediation. Thus the use of chelating presents as an alternative to maintain high levels of this metal in the soil solution. Thus, the present study aimed to evaluate laboratory conditions on the …
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Truffle crops and soil drugs : new fungal practices and epistemologies for the 21st century
… crop grown across the globe. Since the 1890s, soil microbes have been commodified to "fertilize" agricultural crops (and are now referred to as biofertilizers, biostimulants, or simply "soil drugs"). This dissertation examines both truffle crops and soil drugs to investigate how a beneficial …
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Powdery Mildew (Erysiphe cruciferarum) Affects the Allelopathic and Competitive Abilities of Invasive Garlic Mustard (Alliaria petiolata)
… allelopathic plants (A. petiolata) that disrupt soil microbes seem to have. Sterilization inhibited growth of E. canadensis through the destruction of beneficial effects from microbes, while increasing the growth of L. maackii by inhibiting the pathogenic effects of microbes.
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Soil and compost tea: A new restoration technique?
… the plant community but overlook the soil microbial community even though microbes are critical to habitat functioning. Developing techniques that increase soil microbes in prairie restorations is critical to ensuring diverse restored habitats. We compared how microbial communities …
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Soil carbon and nitrogen cycle modeling for bioenergy crops
… on the effect of the expansion of these crops on soil carbon and nitrogen dynamics is integral to understanding their long-term environmental impacts. We developed a coupled hydrological-soil nutrient model under identical field conditions and different harvest litter input scenarios. Our project …
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Effects of invasion by the common reed (<i>phragmites australis</i>) on carbon transformations in a Great Lakes marsh
… litter decomposition, effects of water level on soil microbes, and soil microbial response to leachate additions were investigated in<em> Phragmites</em> invaded and pre-invaded <em>Typha</em> sites. Less litter mass was lost from <em>Phragmites</em> than <em>Typha</em> in both sites during the …
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Building A Mechanistic Understanding Of Biodiversity And Ecosystem Functioning In Forests
… leaf-level physiological measurements, and soil analyses. First, I found that fast-growing, early successional tree species created a buffered microclimate (reduced daily amplitude of vapor pressure deficit) within forest canopies, relieving physiological stress of slower-growing trees and …
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Markerfreie transplastome Tabakpflanzen
… of these genes through pollen release or to soil microbes via horizontal gene transfer is of considerable environmental concern. The use of chloroplast transformation alleviates the first of these problems to some degree since plastid-encoded genes are maternally inherited in most important …
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Soil microbial community dynamics associated with 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, which in turn determine the growing …
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Soil carbon dynamics in the upper Mersey estuarine floodplain, northwest England : implications for soil carbon sequestration
There have been several studies on soil carbon dynamics in estuarine floodplains. However, little attempt has been made to examine the effects of heavy metal contamination on these processes. This represents a knowledge gap that needs to be filled to understand better soil carbon decomposition in …
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The influence of leaf litter and plants on soil respiration before, during and after a severe drought
… importance of drought events, their effect on soil carbon dynamics are less well understood. The above-below ground linkages that affect soil dynamics in forested areas during drought and immediately after rewetting can have a substantial impact on how soil carbon is stored. Soil respiration …
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The impact of silver nanoparticles on plant physiology
… interaction between ENPs with plants and soil microbial communities is of great concern given that they play fundamental roles in the environment and food production. In this study, the impact of capped silver nanoparticles (cAg NPs) on terrestrial (Arabidopsis thaliana and Vicia faba) and …
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