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 52 for “"soil bacteria"”.
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Development of a differential medium for the isolation and study of soil bacteria in the family Rhizobiaceae
… a differential medium for isolation of soil bacteria in the family Rhizobiaceaa was conducted. Although the observation was made that pure cultures of I Rhizobium were able to grow on the rose bengal agar of Smith and Dawson, bacteria in the family Rhizobiaceae did not develop when soil …
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Investigation of Pyrimidine Salvage Pathways to Categorize Indigenous Soil Bacteria of Agricultural and Medical Importance and Analysis of the Pyrimidine Biosynthetic Pathway's Enzyme Properties for Correlating Cell Morphology to Function in All Phases of Growth
… with an intriguing growth cycle. Whereas most bacteria exist as either a rod or coccus, this bacterium shares the rod/coccus lifestyle. It therefore seemed important to examine the growth regulatory pathways from the rod and coccus. The committed step, that catalyzed by aspartate …
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Endogenous production and detoxification of a potent cytotoxin, nitric oxide, in Salmonella enterica serovar Typhimurium and Escherichia coli
… to various host (human and animal) and non-host (soil, water and industrial) environments. Nitrosative stress, in the form of RNS such as the potent cytotoxin NO, is an important stress in the Salmonella lifecycle. Salmonella is exposed to exogenous NO, produced by activated macrophages as part of …
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Microbial instrumentation utilizing microfluidics
… can break through these challenges. In nature, bacteria live in communities with abundant inter-species chemical communication. To replicate such environments in laboratory conditions, nanoporous microscale microfluidic incubators (NMMIs) for co-culture of multiple species have been developed. …
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Biodegradation of organic contaminants in subsurface systems: kinetic and metabolic considerations
… reclamation projects is the use of the natural soil bacteria to degrade organic contaminants. Very little is known, however, about subsurface soil bacteria to man-made organic chemicals or the degradation rates of these compounds. Such information would be useful in planning cleanup or …
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Insights into microbial community structure from pairwise interaction networks
… of 20 strains of naturally co-occurring soil bacteria. The resulting interaction network is strongly hierarchical and lacks significant non-transitive motifs, a result that is robust across multiple environments. Multispecies competitions resulted in extinction of all but the most highly …
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Discovery and Characterization of an Antibiotic from the Soil Bacterium <em>Bacillus</em> sp.
… source for new inhibitory compounds. Fifty four soil bacteria were isolated using enrichment culture techniques (including 37 <em>Rhodococcus</em>) and screened for antibiotic producers. BTHX2, a species of <em>Bacillus</em> was found to have activity against <em>Micrococcus luteus</em> and …
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Denitrification in a best management practice bioretention system
… investigates the occurrence of denitrifying soil bacteria in a bioretention system located in Singapore and containing a saturated anoxic zone intended to facilitate denitrification. Soil samples were collected from six depths within the rain garden, four of which were within the saturated …
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Efforts Toward Production of Novel Natural Products From Uncultured Soil Microbes
… of small molecule natural products from bacteria has led to the identification of many of the antibiotics currently in use today. Within the last 25 years, in fact, natural products (and their derivatives) account for almost three quarters of all antibiotic discoveries (Newman and Cragg). …
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FTIR Analysis of Bacteria Biomass-Mineral Interactions in Soils
<p>Soil organic carbon (SOC) accounts for 70% of the carbon on Earth. It is therefore a key player in global carbon cycling and climate change (Smith et al., 2008). Soil organic matter (SOM) is an important component of organic matter in soils (SOC), and results from biogeochemical process …
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Silver Nanoparticles and the Plant-Associating Abilities of Rhizobiaceae Bacteria
… ratio that allows for higher reactivity with bacterial cell surfaces. AgNPs are being released into the environment, including soil ecosystems through various pathways such as points of production or during disposal of silver-containing products. This raises the concern about the potential …
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Interactions between nematodes, potato and soil-borne micro-organisms and their effect on the management of potato cyst nematodes
… elucidate the complex tritrophic PCNpotato-soil bacteria relationship. Bacterial strains isolated from the sugar beet rhizosphere were shown to be hatch active towards Globodera pallida and to be capable of successfully colonising the sugar beet rhizosphere when applied exogenously. A …
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Phenotypic characterization of rhizobia isolates and distribution of Burkholderia rhizobia in the Core Cape Subregion
… is well known for its low nutrient, low pH soils which harbour a variety of alpha and beta- Proteobacteria associated with a diversity of legume species. Soil bacteria are important for ecological processes and are influenced mostly by edaphic factors such as salinity and pH, and climatic …
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Sympatric Soil Microbe Interactions between Streptomyces and Fusarium Isolates
<p>Interkingdom interactions between soil bacteria and fungi may play a critical role in occurrence of disease suppressive soils, yet our understanding of these interactions remains limited. <em>Streptomyces</em> are well-known producers of antimicrobial compounds important to medicine and …
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Characterization of DNA-repair potential in deep subsurface bacteria challenged by UV light, hydrogen peroxide, and gamma radiation
Subsurface bacterial isolates obtained through the DOE Subsurface Science Program were tested for resistance to UV light, gamma radiation and H₂0₂. Some deep subsurface bacteria were resistant to UV light, demonstrating ≥1.0% survival at fluences which resulted in a 0.0001% survival level of E. …
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Investigating Rhizobium Leguminosarum Metabolism and Rhizosphere Colonization Using High-Throughput Genomics and Erythritol Enrichments
… plant-based diets gain in popularity. Rhizobia bacteria are used as inoculants to increase the yield of legume crops by fixing nitrogen in nodules on legume roots; this reduces the use of costly and environmentally harmful nitrogen fertilizers. Erythritol is exudated from legume roots, and is …
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The Influence of Land Coverage and Soil Chemical Factors on Soil Bacterial Community Diversity and Structure in Cedartown, GA, USA
… due to their mobility and solubility in soil. Bacteria communities are vulnerable to heavy metal stress, but the response of different bacterial groups may vary depending on the level and type of heavy metal contamination. When subjected to heavy metal stress, many bacterial species or …
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Quantifying the Intracellular Metabolic Network that Establishes the Simultaneous Utilization of Sugars and Aromatic Substrates in Pseudomonas putida KT2440
… metabolism in the biotechnologically-important soil bacterium Pseudomonas putida KT2440 during feeding on a mixture containing the cellulosic hexose sugar (glucose) and an aromatic carboxylic acid (benzoate). Through a combination of 13C tracer experiments with metabolic flux analysis (MFA), I …
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Advancing Polycyclic Aromatic Hydrocarbon Bioremediation using Genetic Bioaugmentation in Soil Microbial Communities
… These 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 …
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