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 16 of 16 for “"nirK"”.
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Perennial energy crops on riparian buffers affect nitrogen cycling microbial communities
… nitrite ammonification (nrfA), denitrification (nirK, nirS, norB, and nosZ), and N fixation (nifH). The results indicated that N application significantly affected the abundance of four different functional enzyme groups. The abundance of bacterial amoA (AOB) increased as N fertilization …
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Soil quality and nitrogen cycling dynamics altered by fertility amendments in intensively managed vegetable production systems
… (AOA), bacteria (AOB), nitrite reductases (nirK and nirS) and nitrous oxide reductase (nosZ) genes, and community structure of bacterial ammonia monooxygenase (amoA) and nirK were quantified in bulk and rhizosphere soil samples collected from open field plots. In 2011, chard yield was lower …
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Geomicrobiology of nitrogen in a coastal aquifer : isotopic and molecular methods to examine nitrification and denitrification in groundwater
… However, nitrite reductase, nirS and nirK, genes were also recovered from the sediments with nirK dominating in the surface sediments. This contrasts with the deep salt wedge, where the microbial community 16S rRNA genes appear more closely related to marine or reducing …
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Geomicrobiology of nitrogen in a coastal aquifer : isotopic and molecular methods to examine nitrification and denitrification in groundwater
… However, nitrite reductase, nirS and nirK, genes were also recovered from the sediments with nirK dominating in the surface sediments. This contrasts with the deep salt wedge, where the microbial community 16S rRNA genes appear more closely related to marine or reducing …
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Microbial Regulation of Soil Greenhouse Gas Emissions in a Non-Bloat Legume Grazing System
… increases were greater and more sustained than nirK, while nirK increased activity more rapidly but did not increase gene abundance. Urine toxicity and increased clade II nosZ transcription likely reduced initial N2O emissions at high urea concentrations, resulting in no difference between …
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Greenhouse gas metabolizing prokaryotes in peatlands
… and denitrification-associated genes narG, nirK/nirS, and nosZ indicated that the diversity of the denitifier community was highest in pH-neutral fen soil and positively correlated with pH. Detected narG affiliated mainly with Betaproteobacterial and Actinobacterial narG. . The number and …
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Evaluación de comunidades microbianas en suelos semiáridos del sur-oeste bonaerense, bajo distintos sistemas de manejo agrícola
… la mitad se confirmó la presencia tanto del gen nirK como nosZ (que codifican para las enzimas nitrito reductasa de cobre y óxido nitroso reductasa, respectivamente), mientras que en el resto solo se detectó el primero de ellos, lo que indica la presencia de bacterias desnitrificadoras parciales …
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Structural and functional characterization of bacterial diversity in the rhizospheres of three grain legumes
… communities. Genes for nitrite reductase (nirK and nirS), which may lead to removal of nitrogen from the system by denitrification, were targeted to gain an understanding of the importance of this enzyme in a nitrogen-enriching environment. The presence of nirS was not detected in any of …
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Molekulare und physiologische Charakterisierung des Energiestoffwechsels von Nitrosomonas europaea
… der zugehörigen Gene amoA/hao/rh1, nirK/norB und cbbL/ftsZ. Die Konzentration von amoA-, hao-, rh1-, coxA-, cbbL, ftsZ- und sodB-mRNA in anaerob Ammoniak-oxidierenden Nitrosomonas-Zellen war im Bezug auf aerob Ammoniak-oxidierende Nitrosomonas-Zellen reduziert, die Konzentration an …
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Denitrification, Dissimilatory Nitrate Reduction, and Methanogenesis in the Gut of Earthworms (Oligochaeta): Assessment of Greenhouse Gases and Genetic Markers
… reductase; targets denitrifiers and DNR), nirK, nirS (both encoding for a nitrite reductase; target denitrifiers), nosZ (encoding for a N2O reductase; targets denitrifiers), and mcrA/mrtA (encoding for the methyl-CoM reductase and its isoenzyme; target methanogenic Archaea) were analyzed. …
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Characterization of the prokaryotic community associated with the giant barrel sponge, Xestospongia muta across the Caribbean
… (ammonia oxidation), norB (denitrification), and nirK (denitrification). Nitrogen cycling in X. muta appears to be more complex than previous studies have shown. These results have important ecological implications for the understanding of host-microbe associations, and provide a foundation for …
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Improving performance and expanding application of denitrifying bioreactors for nutrient management in agricultural landscapes
… targeted nitrogen-cycling gene abundances (nirS, nirK, nosZI, nosZII) were generally unreliable predictors of NRE in both media types. The second study (Chapter 4) used a four-year field-scale dataset to evaluate saturated water depth and test common hydraulic assumptions on bioreactor performance …
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Evaluation of Digital PCR (dPCR) for the Quantification of Soil Nitrogen Turnover Bacteria in Wetland Mesocosms in Response to Season, Fertilization, and Plant Species Richness
… groups detected in May (November) were AOB, nirK, anammox, and Nitrospira spp. NOB (AOB, anammox, Nitrospira spp. NOB, and nosZ). The effects of plant species richness were more nuanced, with greater richness significantly impacting the abundance of only a subset of bacterial groups (i.e., …
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Biochar and pH as Drivers of Greenhouse Gas Production in Denitrification Systems
… 3) Quantify key denitrification genes (nirK, nirS, nosZ) in each treatment combination. Experimental results showed biochar treatment to significantly increase N2O emissions, a result which runs contrary to most, but not all studies regarding its effects on N2O production. Differences …
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Bioaugmentation and biostimulation of a South African coal-based Technosol as a mine rehabilitation strategy
… vegetation and inoculation, abundances of nirK gene encoding nitrite reductase denitrification enzymes were augmented in Technosols fabricated with higher dosages of MR, suggesting enhanced nitrogen uptake. Vegetation in inoculated Technosols amended with 5 wt.% MR assisted remediation of …
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Zeolite Incorporated Materials for Targeted Biomass Retention and Pollutant Removal
… denitrifying genes (specifically nirS, nirK, and nosZ) were also retained in systems with zeolite-coated carriers, indicating the nitrite-shunt process maybe another application. Zeolite-coated membranes were configured in flow-through membrane-aerated reactors and subject to varying …