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Ammonia oxidizing bacteria

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https://www.readbyqxmd.com/read/29785352/diversity-and-community-structure-of-marine-microbes-around-the-benham-rise-underwater-plateau-northeastern-philippines
#1
Andrian P Gajigan, Aletta T Yñiguez, Cesar L Villanoy, Maria Lourdes San Diego-McGlone, Gil S Jacinto, Cecilia Conaco
Microbes are central to the structuring and functioning of marine ecosystems. Given the remarkable diversity of the ocean microbiome, uncovering marine microbial taxa remains a fundamental challenge in microbial ecology. However, there has been little effort, thus far, to describe the diversity of marine microorganisms in the region of high marine biodiversity around the Philippines. Here, we present data on the taxonomic diversity of bacteria and archaea in Benham Rise, Philippines, Western Pacific Ocean, using 16S V4 rRNA gene sequencing...
2018: PeerJ
https://www.readbyqxmd.com/read/29778938/effects-of-short-and-long-term-exposure-of-silver-nanoparticles-and-silver-ions-to-nitrosomonas-europaea-biofilms-and-planktonic-cells
#2
L K Barker, J R Giska, T S Radniecki, L Semprini
The increasing use of silver nanoparticles (AgNPs) in consumer products, and their resulting influx into wastewater, may pose a threat to biological nutrient removal in wastewater treatment plants. Planktonic ammonia-oxidizing bacteria (AOB), which convert ammonia to nitrite in the first step of nitrification, are highly sensitive to AgNPs and their released silver ions (Ag+ ), but the sensitivity of AOB biofilms to AgNPs and Ag+ is less clear. This study demonstrated that biofilms of Nitrosomonas europaea, a model AOB, were more resistant to both short-term and long-term exposure to AgNP and Ag+ than planktonic cells...
May 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/29778159/effects-of-1-octyl-3-methylimidazolium-nitrate-on-the-microbes-in-brown-soil
#3
Cheng Zhang, Jun Wang, Lusheng Zhu, Zhongkun Du, Jinhua Wang, Xi Sun, Tongtong Zhou
The toxicity of ionic liquids (ILs) on soil organisms has aroused wide attention due to their high-solubility. The present investigation focused on the toxicity of 1-octyl-3-methylimidazolium nitrate ([C8 mim]NO3 ) on the microbial populations (bacteria, fungi, and actinomycetes), soil enzyme (urease, dehydrogenase, acid phosphatase, and β-glucosidase) activities, microbial community diversity using terminal restriction fragment length polymorphism (T-RFLP), and abundance of the ammonia monooxygenase (amoA) genes of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) using quantitative real-time polymerase chain reaction (q-PCR) in brown soil at each trial with doses of 0, 1...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29777596/morphological-analysis-of-pore-size-and-connectivity-in-a-thick-mixed-culture-biofilm
#4
Alex F Rosenthal, James S Griffin, Michael Wagner, Aaron I Packman, Oluwaseyi Balogun, George F Wells
Morphological parameters are commonly used to predict transport and metabolic kinetics in biofilms. Yet, quantification of biofilm morphology remains challenging due to imaging technology limitations and lack of robust analytical approaches. We present a novel set of imaging and image analysis techniques to estimate internal porosity, pore size distributions, and pore network connectivity to a depth of 1 mm at a resolution of 10 µm in a biofilm exhibiting both heterotrophic and nitrifying activity. Optical coherence tomography (OCT) scans revealed an extensive pore network with diameters as large as 110 µm directly connected to the biofilm surface and surrounding fluid...
May 19, 2018: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/29758420/assessment-of-the-impact-of-three-pesticides-on-microbial-dynamics-and-functions-in-a-lab-to-field-experimental-approach
#5
P A Karas, C Baguelin, G Pertile, E S Papadopoulou, S Nikolaki, V Storck, F Ferrari, M Trevisan, A Ferrarini, F Fornasier, S Vasileiadis, G Tsiamis, F Martin-Laurent, D G Karpouzas
The toxicity of pesticides on soil microorganisms is as an emerging area of concern. Novel and well-standardized tools could be now used to provide a robust assessment of the ecotoxicity of pesticides on soil microorganisms. We followed a tiered lab-to-field approach to assess the toxicity of three pesticides, widely used at EU level, (chlorpyrifos (CHL), isoproturon (IPU) and tebuconazole (TBZ)) on (i) the abundance of 11 microbial taxa and 8 functional microbial groups via q-PCR and (ii) the activity of enzymes involved in biogeochemical cycles via fluorometric analysis...
May 11, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29746769/predictions-of-the-influent-and-operational-conditions-for-partial-nitritation-with-a-model-incorporating-ph-dynamics
#6
Min Zheng, Shuang Wu, Zhiqiang Zuo, Zhiyao Wang, Yong Qiu, Yan-Chen Liu, Xia Huang, Zhiguo Yuan
Ammonium partial oxidation to nitrite (i.e. partial nitritation) is required in a two-stage autotrophic nitrogen removal system, to provide effluent suitable for the anammox reaction. This study aims to establish influent (ammonium and bicarbonate concentrations) and operational (dissolved oxygen (DO) concentration and solids retention time (SRT)) conditions that favor partial nitritation. This is achieved through extending the nitritation and nitratation models to predict pH variation as well as the effects of pH, free ammonia (NH3) and free nitrous acid (HNO2) on the two reactions...
May 10, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29745187/-type-and-key-drivers-of-nitrification-for-an-acidic-peat-soil-in-xiaoxing-an-mountain-china
#7
Zhi Hui Wang, Jing Su, Xian Jun Jiang
Acidic forest peat soil in Xiaoxing'an Mountain was used to investigate the type and key drivers of nitrification by carrying out nitrification incubation after adding 10 mL·L-1 C2 H2 and different amounts of (NH4 )2 SO4 (0, 1.2, 6.0 mmol N·kg-1 ). Results showed that strong mineralization (0.9-1.4 mg N·kg-1 ·d-1 ) and nitrification (0.4-0.6 mg N·kg-1 ·d-1 ) after 2 weeks of incubation were observed for both nitrogen and no nitrogen treatments, and no significant difference was observed for different (NH4 )2 SO4 application treatments...
May 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29744521/impact-of-heavy-metal-pollution-on-ammonia-oxidizers-in-soils-in-the-vicinity-of-a-tailings-dam-baotou-china
#8
Jumei Liu, Weiwei Cao, Haiming Jiang, Jing Cui, Chunfang Shi, Xiaohui Qiao, Ji Zhao, Wantong Si
Soil heavy metal pollution has received increasing attention due to their toxicity to soil microorganisms. We have analyzed the effects of heavy metal pollution on ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in soils in the vicinity of a tailings dam of Baotou region, China. Results showed that AOB were dominated with Nitrosomonas-like clusters, while AOA was dominated by group1.1b (Nitrososphaera cluster). Single Cd and Cr contents, as well as compound heavy metal pollution levels, had a significant negative impact on soil potential nitrification rate and both diversities of AOA and AOB...
May 9, 2018: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29734589/population-and-community-structure-shifts-of-ammonia-oxidizers-after-four-year-successive-biochar-application-to-agricultural-acidic-and-alkaline-soils
#9
Lili He, Yucui Bi, Jin Zhao, Cameron M Pittelkow, Xu Zhao, Shenqiang Wang, Guangxi Xing
Long-term studies that advance our mechanistic understanding of biochar (BC)‑nitrogen (N) interactions in agricultural soils are lacking. In this study, soil potential nitrification rates (PNR), the abundance and composition of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) communities following 4-year of BC application were investigated using the shaken-slurry procedure and molecular sequencing techniques for an acidic Oxisol (QU) and an alkaline Cambisol (YU). Soils were obtained from an outdoor soil column experiment with straw-BC application rates of 0 (BC0), 2...
April 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29730522/autotrophic-and-heterotrophic-nitrification-anoxic-denitrification-dominated-the-anoxic-oxic-sewage-treatment-process-during-optimization-for-higher-loading-rate-and-energy-savings
#10
Xueyu Zhang, Shaokui Zheng, Hangyu Zhang, Shoupeng Duan
This study clarified the dominant nitrogen (N)-transformation pathway and the key ammonia-oxidizing microbial species at three loading levels during optimization of the anoxic/oxic (A/O) process for sewage treatment. Comprehensive N-transformation activity analysis showed that ammonia oxidization was performed predominantly by aerobic chemolithotrophic and heterotrophic ammonia oxidization, whereas N2 production was performed primarily by anoxic denitrification in the anoxic unit. The abundances of ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria, and anaerobic AOB in activated sludge reflected their activities on the basis of high-throughput sequencing data...
April 30, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29727958/salinity-is-a-key-factor-driving-the-nitrogen-cycling-in-the-mangrove-sediment
#11
Haitao Wang, Jack A Gilbert, Yongguan Zhu, Xiaoru Yang
Coastal ecosystems are hotspots for nitrogen cycling, and specifically for nitrogen removal from water and sediment through the coupled nitrification-denitrification process. Salinity is globally important in structuring bacterial and archaeal communities, but the association between salinity and microbially-mediated nitrification and denitrification remains unclear. The denitrification activity and composition and structure of microbial nitrifiers and denitrifiers were characterized across a gradient of manipulated salinity (0, 10, 20 and 30ppt) in a mangrove sediment...
August 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29709805/performance-and-microbial-community-of-anammox-in-presence-of-micro-molecule-carbon-source
#12
Shilong He, Wan Yang, Meng Qin, Zhen Mao, Qigui Niu, Ming Han
Because ammonium (NH4 + -N) coexists with organic matter in some wastewaters, the possible adverse influences of organic matter become a major concern in the applications of anaerobic ammonium oxidation (anammox). In this study, the effects of acetate, as a representative of micro-molecule organic matter, on anammox were investigated. Efficient nitrogen removal was realized because denitrifying bacteria and anammox bacteria (AnAOB) had a better synergistic effect under the condition of chemical oxygen demand (COD) concentrations lower than 251 ± 7 mg L-1 ...
April 23, 2018: Chemosphere
https://www.readbyqxmd.com/read/29704181/influence-of-temperature-fluctuations-on-one-stage-deammonification-systems-in-northern-cold-region
#13
Xiaolong Wang, Guiman Qi, YuegenYan, Dawen Gao
Cold and fluctuant temperatures are still a bottleneck for the application of one-stage deammonification in mainstream anammox (anaerobic ammonium oxidation). In this study, to simulate the practical but critical operational condition under rapidly fluctuant temperatures between April and May in cold northern area, two deammonification reactors with anammox granular sludge and nitritation flocculent sludge were tested under the cold shock with temperature fluctuations (11-18 °C). Under the controlled temperature (32 °C), good performances were obtained in both reactors...
April 28, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29696905/-effect-of-influent-c-n-on-nitrogen-removal-performance-in-tidal-flow-constructed-wetland-via-canon-process
#14
Meng Lu Huang, Zhan Peng Li, Zhen Wang
This study was conducted to explore nitrogen transformation and associated microbial characteristics in a tidal flow constructed wetland (TFCW) with the complete autotrophic nitrogen removal over nitrite (CANON) process under influent COD/TN (C/N) constraints. The influent C/N increased from 0.0 to 10.0 via the addition of glucose in the influent as a source of organics. The results showed that influent C/N significantly affected nitrogen transformation rates in the TFCW throughout the experiment. As the influent C/N increased from 0...
December 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29692769/continuously-monocropped-jerusalem-artichoke-changed-soil-bacterial-community-composition-and-ammonia-oxidizing-and-denitrifying-bacteria-abundances
#15
Xingang Zhou, Zhilin Wang, Huiting Jia, Li Li, Fengzhi Wu
Soil microbial communities have profound effects on the growth, nutrition and health of plants in agroecosystems. Understanding soil microbial dynamics in cropping systems can assist in determining how agricultural practices influence soil processes mediated by microorganisms. In this study, soil bacterial communities were monitored in a continuously monocropped Jerusalem artichoke (JA) system, in which JA was successively monocropped for 3 years in a wheat field. Soil bacterial community compositions were estimated by amplicon sequencing of the 16S rRNA gene...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29692763/-nitrosospira-sp-govern-nitrous-oxide-emissions-in-a-tropical-soil-amended-with-residues-of-bioenergy-crop
#16
Késia S Lourenço, Noriko A Cassman, Agata S Pijl, Johannes A van Veen, Heitor Cantarella, Eiko E Kuramae
Organic vinasse, a residue produced during bioethanol production, increases nitrous oxide (N2 O) emissions when applied with inorganic nitrogen (N) fertilizer in soil. The present study investigated the role of the ammonia-oxidizing bacteria (AOB) community on the N2 O emissions in soils amended with organic vinasse (CV: concentrated and V: non-concentrated) plus inorganic N fertilizer. Soil samples and N2 O emissions were evaluated at 11, 19, and 45 days after fertilizer application, and the bacterial and archaea gene ( amo A) encoding the ammonia monooxygenase enzyme, bacterial denitrifier ( nir K, nir S, and nos Z) genes and total bacteria were quantified by real time PCR...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29692163/-effects-of-biochar-application-on-the-abundance-and-structure-of-ammonia-oxidizer-communities-in-coal-mining-area
#17
Yuan Liu, Ji Rong Zhu, Yu Chen Wu, Liang Zuo Shu
As a new type of soil amendment, biochar can effectively improve soil fertility, structure and soil nitrogen transformation. We studied the effects of biochar application on soil properties, abundance and community structure of ammonia oxidizer in coal-mining area. The results showed that the biochar application significantly increased contents of soil NH4+-N, total nitrogen, available phosphorus and potassium. Compared with the control, no change in the abundance of ammonia-oxidizing archaea (AOA) was found under biochar treatment, but there was a significant increase in the abundance of ammonia-oxidizing bacteria (AOB)...
October 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29690652/genome-guided-analysis-of-clostridium-ultunense-and-comparative-genomics-reveal-different-strategies-for-acetate-oxidation-and-energy-conservation-in-syntrophic-acetate-oxidising-bacteria
#18
Shahid Manzoor, Anna Schnürer, Erik Bongcam-Rudloff, Bettina Müller
Syntrophic acetate oxidation operates close to the thermodynamic equilibrium and very little is known about the participating organisms and their metabolism. Clostridium ultunense is one of the most abundant syntrophic acetate-oxidising bacteria (SAOB) that are found in engineered biogas processes operating with high ammonia concentrations. It has been proven to oxidise acetate in cooperation with hydrogenotrophic methanogens. There is evidence that the Wood-Ljungdahl (WL) pathway plays an important role in acetate oxidation...
April 23, 2018: Genes
https://www.readbyqxmd.com/read/29687586/ammonia-oxidizing-bacteria-are-the-primary-n-2-o-producers-in-an-ammonia-oxidizing-archaea-dominated-alkaline-agricultural-soil
#19
Kelley A Meinhardt, Nejc Stopnisek, Manmeet W Pannu, Stuart E Strand, Steven C Fransen, Karen L Casciotti, David A Stahl
Most agricultural N2 O emissions are a consequence of microbial transformations of nitrogen (N) fertilizer, and mitigating increases in N2 O emission will depend on identifying microbial sources and variables influencing their activities. Here, using controlled microcosm and field studies, we found that synthetic N addition in any tested amount stimulated the production of N2 O from ammonia-oxidizing bacteria (AOB), but not archaea (AOA), from a bioenergy crop soil. The activities of these two populations were differentiated by N treatments, with abundance and activity of AOB increasing as nitrate and N2 O production increased...
April 24, 2018: Environmental Microbiology
https://www.readbyqxmd.com/read/29687546/community-and-functional-shifts-in-ammonia-oxidizers-across-terrestrial-and-marine-soil-sediment-boundaries-in-two-coastal-bay-ecosystems
#20
Limei Zhang, Aoife Duff, Cindy J Smith
Terrestrial-marine boundaries are significant sites of biogeochemical activity with delineated gradients from land to sea. While niche differentiation of ammonia-oxidizing archaea (AOA) and bacteria (AOB) driven by pH and nitrogen is well known, the patterns and environmental drivers of AOA and AOB community structure and activity across soil-sediment boundaries have not yet been determined. In this study, nitrification potential rate, community composition and transcriptional activity of AOA and AOB in soil, soil/sediment interface and sediments of two coastal Bays were characterized using a combination of field investigations and microcosm incubations...
April 24, 2018: Environmental Microbiology
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