A comparison of community structure and denitrifying ratio for denitrifying bacteria dependent on agricultural methods and seasons

2017 ◽  
Vol 53 (1) ◽  
pp. 9-19
Author(s):  
Jun-Beom Yoon ◽  
Kyeong Ryang Park
Keyword(s):  
Community Structure ◽  
Denitrifying Bacteria

Influences of artificial shading and nutrient addition on denitrification activity and community structure of denitrifying bacteria in a stream

2018 ◽  
Vol 38 (15) ◽  
Author(s):  
陈秋阳 CHEN Qiuyang ◽  
赵彬洁 ZHAO Binjie ◽  
袁洁 YUAN Jie ◽  
张健 ZHANG Jian ◽  
谭香 TAN Xiang ◽  
...  
Keyword(s):  
Community Structure ◽  
Denitrifying Bacteria ◽  
Nutrient Addition ◽  
Denitrification Activity ◽  
Artificial Shading

Effects of cattle fertilizer on community structure of nirK- and nirS- type denitrifying bacteria in soil

2017 ◽  
Vol 37 (11) ◽  
Author(s):  
王婷 WANG Ting ◽  
刘丽丽 LIU Lili ◽  
张克强 ZHANG Keqiang ◽  
王风 WANG Feng ◽  
杜会英 DU Huiying ◽  
...  
Keyword(s):  
Community Structure ◽  
Denitrifying Bacteria

scholarly journals Stratification of Activity and Bacterial Community Structure in Biofilms Grown on Membranes Transferring Oxygen

2004 ◽  
Vol 70 (4) ◽  
pp. 1982-1989 ◽  
Author(s):  
Alina C. Cole ◽  
Michael J. Semmens ◽  
Timothy M. LaPara
Keyword(s):  
Community Structure ◽  
Organic Carbon ◽  
Bacterial Community ◽  
Flow Velocity ◽  
Bacterial Community Structure ◽  
Respiratory Activity ◽  
Denitrifying Bacteria ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Biomass Density

ABSTRACT Previous studies have shown that membrane-aerated biofilm (MAB) reactors can simultaneously remove carbonaceous and nitrogenous pollutants from wastewater in a single reactor. Oxygen is provided to MABs through gas-permeable membranes such that the region nearest the membrane is rich in oxygen but low in organic carbon, whereas the outer region of the biofilm is void of oxygen but rich in organic carbon. In this study, MABs were grown under similar conditions but at two different fluid velocities (2 and 14 cm s−1) across the biofilm. MABs were analyzed for changes in biomass density, respiratory activity, and bacterial community structure as functions of biofilm depth. Biomass density was generally highest near the membrane and declined with distance from the membrane. Respiratory activity exhibited a hump-shaped profile, with the highest activity occurring in the middle of the biofilm. Community analysis by PCR cloning and PCR-denaturing gradient gel electrophoresis of 16S rRNA genes demonstrated substantial stratification of the community structure across the biofilm. Population profiles were also generated by competitive quantitative PCR of gene fragments specific for ammonia-oxidizing bacteria (AOB) (amoA) and denitrifying bacteria (nirK and nirS). At a flow velocity of 14 cm s−1, AOB were found only near the membrane, whereas denitrifying bacteria proliferated in the anoxic outer regions of the biofilm. In contrast, at a flow velocity of 2 cm s−1, AOB were either not detected or detected at a concentration near the detection limit. This study suggests that, under the appropriate conditions, both AOB and denitrifying bacteria can coexist within an MAB.

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