scholarly journals Dynamics of Sulfate-Reducing Bacteria Community Structure in Surface Sediment of a Seasonally Hypoxic Enclosed Bay

2018 ◽  
Vol 33 (4) ◽  
pp. 378-384
Author(s):  
Fumiaki Mori ◽  
Yu Umezawa ◽  
Ryuji Kondo ◽  
Minoru Wada
Keyword(s):  
Community Structure ◽  
Surface Sediment ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reducing ◽  
Enclosed Bay ◽  
Bacteria Community Structure ◽  
Reducing Bacteria

scholarly journals Three-year survey of sulfate-reducing bacteria community structure in Carnoulès acid mine drainage (France), highly contaminated by arsenic

2012 ◽  
Vol 83 (3) ◽  
pp. 724-737 ◽  
Author(s):  
Ludovic Giloteaux ◽  
Robert Duran ◽  
Corinne Casiot ◽  
Odile Bruneel ◽  
Françoise Elbaz-Poulichet ◽  
...  
Keyword(s):  
Community Structure ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reducing ◽  
Acid Mine ◽  
Bacteria Community Structure ◽  
Reducing Bacteria

scholarly journals Active Anaerobic Archaeal Methanotrophs in Recently Emerged Cold Seeps of Northern South China Sea

2020 ◽  
Vol 11 ◽  
Author(s):  
Tingting Zhang ◽  
Xi Xiao ◽  
Songze Chen ◽  
Jing Zhao ◽  
Zongheng Chen ◽  
...  
Keyword(s):  
Community Structure ◽  
South China Sea ◽  
Bacterial Communities ◽  
Northern South China Sea ◽  
Sulfate Reducing Bacteria ◽  
Cold Seep ◽  
Cold Seeps ◽  
Sulfate Reducing ◽  
Reducing Bacteria ◽  
Rna And Dna

Cold seep ecosystems are developed from methane-rich fluids in organic rich continental slopes, which are the source of various dense microbial and faunal populations. Extensive studies have been conducted on microbial populations in this unique environment; most of them were based on DNA, which could not resolve the activity of extant organisms. In this study, RNA and DNA analyses were performed to evaluate the active archaeal and bacterial communities and their network correlations, particularly those participating in the methane cycle at three sites of newly developed cold seeps in the northern South China Sea (nSCS). The results showed that both archaeal and bacterial communities were significantly different at the RNA and DNA levels, revealing a higher abundance of methane-metabolizing archaea and sulfate-reducing bacteria in RNA sequencing libraries. Site ROV07-01, which exhibited extensive accumulation of deceased Calyptogena clam shells, was highly developed, and showed diverse and active anaerobic archaeal methanotrophs (ANME)-2a/b and sulfate-reducing bacteria from RNA libraries. Site ROV07-02, located near carbonate crusts with few clam shell debris, appeared to be poorly developed, less anaerobic and less active. Site ROV05-02, colonized by living Calyptogena clams, could likely be intermediary between ROV07-01 and ROV07-02, showing abundant ANME-2dI and sulfate-reducing bacteria in RNA libraries. The high-proportions of ANME-2dI, with respect to ANME-2dII in the site ROV07-01 was the first report from nSCS, which could be associated with recently developed cold seeps. Both ANME-2dI and ANME-2a/b showed close networked relationships with sulfate-reducing bacteria; however, they were not associated with the same microbial operational taxonomic units (OTUs). Based on the geochemical gradients and the megafaunal settlements as well as the niche specificities and syntrophic relationships, ANMEs appeared to change in community structure with the evolution of cold seeps, which may be associated with the heterogeneity of their geochemical processes. This study enriched our understanding of more active sulfate-dependent anaerobic oxidation of methane (AOM) in poorly developed and active cold seep sediments by contrasting DNA- and RNA-derived community structure and activity indicators.

scholarly journals CHARACTERIZATION OF SULFATE REDUCING BACTERIA FROM BIOFILM SULFATE REDUCTION AND CU PRECIPITATION BIOREACTOR (BATCH CULTURE).

2018 ◽  
Vol 2 (2) ◽  
pp. 1
Author(s):  
Tyas Nyonita Punjungsari
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Sulfate Reduction ◽  
Batch Culture ◽  
Microbial Community Structure ◽  
Sulfate Reducing Bacteria ◽  
Zeolite Surface ◽  
Sulfate Reducing ◽  
Reducing Bacteria

The biofilm is a microbial community structure formed on the zeolite surface in a sulfate reduction bioreactor and Cu deposition using a SRB consortium . The biofilm soluble microbial solvent is expected to have the capability in sulfate reduction and Cu deposition. Characterization of isolates is required for the optimization of pure culture . The aim of this study is to isolate and characterize the biofilm sulfate reducing bacteria in the sulfate reduction bioreactor and the precipitation of Cu in Batch Culture by a consortium of Sulfate Reducing Bacteria. The method used in this study cultivation was done by using postgate B medium, isolation was done by diluting biofilm on NaCl salt, bacteria grown on NB and postgate B media, characterization done by morphology and biochemistry. There were 3 isolates of B1 (Metylobacterium ), B3 ( Desulfucoccus ), and B2 ( Desulfobacter ). B3 ( Desulfococcus) has the best ability to reduce sulfate and Cu precipitation.Keywords : Sulfur Reducing Bacteria (SRB), Biofilm, Sulfate, Cu. Received: 26 August, 2017; Accepter: 10 September, 2017 

scholarly journals Detection of sulfate-reducing bacteria as an indicator for successful mitigation of sulfide production

2021 ◽  
Author(s):  
Avishek Dutta ◽  
Fernando Valle ◽  
Thomas Goldman ◽  
Jeff Keating ◽  
Ellen Burke ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Critical Time ◽  
Sulfate Reducing Bacteria ◽  
Time Points ◽  
Sulfate Reducing ◽  
Nitrate Treatment ◽  
Reducing Bacteria ◽  
Planktonic Community

Sulfate-reducing bacteria (SRB) are one of the main sources of biogenic H 2 S generation in oil reservoirs. Excess H 2 S production in these systems leads to oil biosouring, which causes operational risks, health hazards and can increase the cost of refining crude oil. Nitrate salts are often added to the system to suppress sulfidogenesis. Because SRB populations can persist in biofilms even after nitrate treatment, identifying shifts in the sessile community is crucial for successful mitigation. However, sampling the sessile community is hampered by its inaccessibility. Here we use the results of a long-term (148 days) ex situ experiment to identify particular sessile community members from observations of the sample waste stream. Microbial community structure was determined for 731 samples across twenty bioreactors using 16S rRNA gene sequencing. By associating microbial community structure with specific steps in the mitigation process, we could distinguish between taxa associated with H 2 S production and mitigation. After initiation of nitrate treatment, certain SRB populations increased in the planktonic community during critical time points, indicating the dissociation of SRBs from the biofilm. Predicted relative abundances of the dissimilatory sulfate reduction pathway also increased during the critical time points. Here, by analyzing the planktonic community structure, we describe a general method that uses high-throughput amplicon sequencing, metabolic inferences, and cell abundance data to identify successful biofilm mitigation. We anticipate that our approach is also applicable to other systems where biofilms must be mitigated but cannot be easily sampled. Importance Microbial biofilms are commonly present in many industrial processes and can negatively impact performance and safety. Within the oil industry, subterranean biofilms cause biosouring with implications for oil quality, cost, occupational health, and the environment. Because these biofilms cannot be directly sampled, methods are needed to indirectly assess the success of mitigation measures. This study demonstrates how the planktonic microbial community can be used to assess the dissociation of SRB-containing biofilms. We found that an increase in the abundance of a specific SRB population in the effluent after nitrate treatment can be used as a potential indicator for the successful mitigation of biofilm-forming SRBs. Moreover, a method for determining critical time points for detecting potential indicators is suggested. This study expands our knowledge in improving mitigation strategies for biosouring and could have broader implications in other systems where biofilms lead to adverse consequences.

scholarly journals Methane-related changes in prokaryotes along geochemical profiles in sediments of Lake Kinneret (Israel)

2015 ◽  
Vol 12 (10) ◽  
pp. 2847-2860 ◽  
Author(s):  
I. Bar-Or ◽  
E. Ben-Dov ◽  
A. Kushmaro ◽  
W. Eckert ◽  
O. Sivan
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Methane Oxidation ◽  
Microbial Community Structure ◽  
Iron Reduction ◽  
Sulfate Reducing Bacteria ◽  
Lake Kinneret ◽  
Anaerobic Oxidation Of Methane ◽  
Sulfate Reducing ◽  
Reducing Bacteria

Abstract. Microbial methane oxidation is the primary control on the emission of the greenhouse gas methane into the atmosphere. In terrestrial environments, aerobic methanotrophic bacteria are largely responsible for this process. In marine sediments, a coupling of anaerobic oxidation of methane (AOM) with sulfate reduction, often carried out by a consortium of anaerobic methanotrophic archaea (ANME) and sulfate-reducing bacteria, consumes almost all methane produced within those sediments. Motivated by recent evidence for AOM with iron(III) in Lake Kinneret sediments, the goal of the present study was to link the geochemical gradients in the lake porewater to the microbial community structure. Screening of archaeal 16S rRNA gene sequences revealed a shift from hydrogenotrophic to acetoclastic methanogens with depth. The observed changes in microbial community structure suggest possible direct and indirect mechanisms for the AOM coupled to iron reduction in deep sediments. The percentage of members of the Nitrospirales order increased with depth, suggesting their involvement in iron reduction together with Geobacter genus and "reverse methanogenesis". An indirect mechanism through sulfate and ANME seems less probable due to the absence of ANME sequences. This is despite the abundant sequences related to sulfate-reducing bacteria (Deltaproteobacteria) together with the occurrence of dsrA in the deep sediment that could indicate the production of sulfate (disproportionation) from S0 for sulfate-driven AOM. The presence of the functional gene pmoA in the deep anoxic sediment together with sequences related to Methylococcales suggests the existence of a second unexpected indirect pathway – aerobic methane oxidation pathway in an anaerobic environment.

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