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1

Molecular analysis of bacterial community diversity in sequencing batch reactor [SBR] operating in autotrophic conditions

100%
Ciesielski S., Cydzik-Kwiatkowska A., Turek J.
Polish Journal of Microbiology
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2007
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tom 56
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nr 1
In the present study the bacterial community structure in a sequencing batch reactor (SBR) operating in autotrophic conditions was determined in relation to temporal variations of NH₄-N, NO₂-N, NO₃-N levels in the effluent. Bacterial richness and composition were determined by PCR-DGGE (Polymerase Chain Reaction - Denaturing Gradient Gel Electrophoresis) of 16S rRNA and amoA genes, and RISA (Ribosomal Intergenic Spacer Analysis) technique. The applied approaches revealed that the composition of bacterial population in the studied SBR varied in time. A positive correlation between Shannon index of ammonia-oxidizing bacteria (AOB) diversity and ammonia level in the effluent was observed. The variation of total bacterial diversity did not reflect the changes in nitrification efficiency.
2

Changes in microbial communities of nitrifying immobilized biomass: the role of operational conditions

84%
Zielinska M., Cydzik-Kwiatkowska A., Wojnowska-Baryla I.
Polish Journal of Environmental Studies
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2012
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tom 21
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nr 4
Our research determined the impact of operational conditions on the quantity of total and ammonia-oxidizing bacteria (AOB) in immobilized biomass. The experiment was conducted for two kinds of wastewater differing in organic carbon concentration at HRTs of 1.5 h, 1.0 h, and 0.5 h. The evaluation of bacteria number was accomplished by using the real-time PCR targeting ammonia monooxygenase (amoA) and 16S rDNA genes. In the absence of organic carbon in the influent, the shortening of HRT from 1.5 h to 0.5 h positively affected the AOB number in immobilized biomass, which reached even 30%. But their activity was limited. In the presence of organic carbon in the influent, the shortening of HRT below 1.5 h resulted in a decline of the abundance of ammonia-oxidizing bacteria and nitrification efficiency.
3
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Abundance and community structure of ammonia oxidizing archaea and bacteria in response to peanut growth under controlled condition in Shandong, China

67%
Huang C., Xu N., Fu Z., Sun B., You S., Ma D., Yu J.
Acta Scientiarum Polonorum. Hortorum Cultus
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2019
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tom 18
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nr 6
Based on a three-year field experiment under controlled condition in Ji’nan, China, the effects of peanut growth on the variation in the abundance and community structure of ammonia oxidizing bacteria (AOB) and archaea (AOA) before and after peanut growth were investigated through quantitative PCR and cluster analysis of terminal-restriction fragment length polymorphism. Our results show that the community composition of AOA and AOB was greatly affected by the peanut growth leading to the decreased abundance of AOA and increased abundance of AOB. Furthermore, AOA and AOB community structures varied before and after peanut growth. Phylogenetic analysis indicated that all AOA and AOB community sequences were clustered into the uncultured group. Altogether, the results suggested that the abundance of AOA and AOB in soil and their community compositions can be greatly affected by the peanut growth.
4

The impact of organic carbon and ammonia load in wastewater on ammonia-oxidizing bacteria community in activated sludge

67%
Cydzik-Kwiatkowska A., Wojnowska-Baryla I.
Polish Journal of Microbiology
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2008
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tom 57
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nr 3
The experiment was carried out in two SBR reactors differing in ammonia load (reactor R1 - ammonia load of 130 mg N-NH₄ x d⁻¹, reactor R2 - ammonia load of 250 mg N-NH₄ x d⁻¹). Feeding conditions in the reactors were switched from favoring autotrophic nitrification through favoring heterotrophic processes and back to autotrophic conditions. Observations of ammonia-oxidizing bacteria (AOB) community changes were based on PCR-RFLP analysis of amplified amoA gene fragments and AOB genetic diversity was evaluated on the base of the number of different amoA gene forms. When only carbonates were introduced with wastewater restriction patterns established about day 23 and 28 at ammonia load of 250 and 130 mg N-NH₄ x d⁻¹, respectively. In both reactors statistically higher number of different amoA gene forms was observed when only carbonates were present in wastewater in comparison to conditions in which sodium acetate was introduced to the reactors. The AOB participation in activated sludge was higher at ammonia load of 250 mg N-NH₄ x d⁻¹ but their genetic diversity was lower in comparison with this observed at ammonia load of 130 mg N-NH₄ x d⁻¹.
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