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 “"SRFA"”.
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Complexation state of iron and copper in ambient particulate matter and its effect on the oxidative potential
… it on a mixture of Suwannee River fulvic acid (SRFA) and Fe or Cu. SRFA is selected as a model compound as it represents the humic-like substances present in ambient PM, which are believed to be complexed with Fe and Cu. The results show that a significant amount of iron pre-mixed with SRFA is …
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Adsorption and photochemical transformation of polycyclic aromatic hydrocarbons on atmospheric water films
… experimental data. Suwannee River fulvic acid (SRFA) was chosen as a surrogate for the surface active substances present in atmospheric water films. The effect of SRFA in the aqueous phase on the equilibrium partitioning of PAHs to the air-water interface were investigated. To compare with SRFA, …
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Investigation of quorum sensing process in Bacillus licheniformis
… by the significant increase (p>0.05) in srfA expression in response to the addition of supernatants of B. licheniformis NCIMB 8874 cultures in their late exponential phase to low cell density cultures of B. subtilis reporter strains, carrying a srfA-lacZ fusion. The investigation of …
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Detection and potential impacts of nanomaterials released from building materials in the natural weathering environment
… copper toxicity as Suwanee River fulvic acid (SRFA), suggesting it had lower copper binding capacity than SRFA. Concrete containing nano-TiO2 (nTiO2) was exposed to outdoor weathering for ~2 years. Soluble elements (e.g. Ca) were released from the concrete at all locations, in keeping with the …
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Photochemistry of Polycyclic Aromatic Hydrocarbons with Environmentally Relevant Metals
… HULIS production is based on comparison to SRFA and is observed in short chain PAH following a surface dependent path through naphthalene derivative intermediate structures. These results help explain brown carbon and health effects observed in areas affected by urban emissions.</p>
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Contribución del regulon Rcs a la virulencia de Salmonella análisis genético y molecular
… virulencia. 3. Estudiar la regulación del operón srfABC, asignado al regulón Rcs gracias a los escrutinios de esta Tesis, y establecer si SrfA, SrfB y SrfC eran proteínas secretadas. 4. Caracterizar la unidad transcripcional en la que se encuentra el gen igaA e identificar su promotor. 5. Realizar …
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Identification and characterization of rickettsial proteins at the host-pathogen interface
… revealed the novel secreted rickettsial factors SrfA–G. Notably, these Srfs include Rickettsia-specific proteins of unknown function that are structurally diverse, variably conserved, and targeted to distinct host cell compartments. I further demonstrate that one of these effectors, SrfD, …
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Organic complexation in karst cave systems: implications for transition metal incorporation into speleothems
… ligands in solution (Suwannee River Fulvic Acid (SRFA) and nitrilotriacetic acid (NTA)), however, the experimental calcite precipitates primarily depicted a direct inclusion of OMCs without prior dissociation. This was particularly pronounced for metal-SRFA complexes due to a considerable degree …
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Environmental Remediation with Fenton Reagents and Synthesis of a Novel Halide Fluorescence Sensor
Suwannee River fulvic acid (SRFA) and humic acid (SRHA) were used as dissolved organic matter (DOM) and were applied to probe the effect of DOM. Addition of DOM resulted in decreased first order rate constants for all species selected. The inhibition became more significant as the hydrophobicity of …
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A Deuterium Labeling Method for the Characterization of (Chromophoric) Dissolved Organic Matter Using Ultrahigh Resolution Electrospray Ionization Mass Spectrometry
… species within Suwannee River fulvic acid (SRFA) were studied by treating an aqueous sample with several amounts of NaBD4. This study demonstrated that most species with at least one ketone/aldehyde moiety were reduced a single time under low [NaBD4], while higher [NaBD4] resulted primarily …
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CHARACTERIZATION OF CA²⁺-MEDIATED VIRULENCE AND MICROBIAL COMPETITION IN THE PLANT PATHOGEN PSEUDOMONAS SYRINGAE
… of P. syringae. In Chapter 3, I investigated the srfABC operon, which was found to be regulated by cynT. Functional assays revealed that srfABC contributes to both virulence and interbacterial competition. Analysis of SrfA indicated it is secreted by P.syringae in a T3- and T6- independent manner. …