Entity

Time filter

Source Type


Yang Y.,State Key Laboratory of Applied Microbiology Southern China | Yang Y.,Guangdong Institute of Microbiology | Xiang Y.,Guangdong Institute of Microbiology | Xia C.,Guangdong Institute of Microbiology | And 5 more authors.
Bioresource Technology | Year: 2014

To understand the interactions between bacterial electrode respiration and the other ambient bacterial electron acceptor reductions, alternative electron acceptors (nitrate, Fe2O3, fumarate, azo dye MB17) were added singly or multiply into Shewanella decolorationis microbial fuel cells (MFCs). All the added electron acceptors were reduced simultaneously with current generation. Adding nitrate or MB17 resulted in more rapid cell growth, higher flavin concentration and higher biofilm metabolic viability, but lower columbic efficiency (CE) and normalized energy recovery (NER) while the CE and NER were enhanced by Fe2O3 or fumarate. The added electron acceptors also significantly influenced the cyclic voltammetry profile of anode biofilm probably via altering the cytochrome c expression. The highest power density was observed in MFCs added with MB17 due to the electron shuttle role of the naphthols from MB17 reduction. The results provided important information for MFCs applied in practical environments where contains various electron acceptors. © 2014 Elsevier Ltd. Source


Yang Y.,Guangdong Institute of Microbiology | Yang Y.,State Key Laboratory of Applied Microbiology Southern China | Xiang Y.,State Key Laboratory of Applied Microbiology Southern China | Sun G.,Guangdong Institute of Microbiology | And 4 more authors.
Environmental Science and Technology | Year: 2015

Bacterial respiration is an essential driving force in biogeochemical cycling and bioremediation processes. Electron acceptors respired by bacteria often have solid and soluble forms that typically coexist in the environment. It is important to understand how sessile bacteria attached to solid electron acceptors respond to ambient soluble alternative electron acceptors. Microbial fuel cells (MFCs) provide a useful tool to investigate this interaction. In MFCs with Shewanella decolorationis, azo dye was used as an alternative electron acceptor in the anode chamber. Different respiration patterns were observed for biofilm and planktonic cells, with planktonic cells preferred to respire with azo dye while biofilm cells respired with both the anode and azo dye. The additional azo respiration dissipated the proton accumulation within the anode biofilm. There was a large redox potential gap between the biofilms and anode surface. Changing cathodic conditions caused immediate effects on the anode potential but not on the biofilm potential. Biofilm viability showed an inverse and respiration-dependent profile when respiring with only the anode or azo dye and was enhanced when respiring with both simultaneously. These results provide new insights into the bacterial respiration strategies in environments containing multiple electron acceptors and support an electron-hopping mechanism within Shewanella electrode-respiring biofilms. © 2014 American Chemical Society. Source


Zhu C.,South China University of Technology | Zhu C.,Guangdong Institute of Microbiology | Zhu C.,State Key Laboratory of Applied Microbiology Southern China | Sun G.,Guangdong Institute of Microbiology | And 5 more authors.
FEMS Microbiology Letters | Year: 2015

The complete genome sequence of Lysinibacillus varians GY32 was determined to be 4 662 822 base pairs in a single circular chromosome. Genes in cell division, cell cycle, surface layer and cell wall synthesis are foundation of its unique cell morphology. The genome contains multiple clusters of transcriptional regulator, two-component system and sigma factors, providing the organism with the ability to regulate a filament-to-rod cell cycle progression. L. varians GY32 was, to our knowledge, the first bacterium with a filament-to-rod cell cycle to be sequenced and its annotated genome might provide new insights into our understanding of bacterial cell cycle regulation. © 2014 FEMS. Source


Yang Y.,Guangdong Institute of Microbiology | Yang Y.,State Key Laboratory of Applied Microbiology Southern China | Lu Z.,China Institute of Technology | Xia C.,State Key Laboratory of Applied Microbiology Southern China | And 5 more authors.
Bioresource Technology | Year: 2015

To test the long-term applicability of scaled-up sediment microbial fuel cells (SMFCs) in simultaneous bioremediation of toxic-contaminated sediments and power-supply for electronic devices, a 100. L SMFC inoculate with heavily contaminated sediments has been assembled and operated for over 2. years without external electron donor addition. The total organic chemical (TOC) degradation efficiency was 22.1% in the electricity generating SMFCs, which is significantly higher than that in the open-circuited SMFC (3.8%). The organic matters including contaminants in the contaminated sediments were sufficient for the electricity generation of SMFCs, even up to 8.5. years by the present SMFC theoretically. By using a power management system (PMS), the SMFC electricity could be harvested into batteries and used by commercial electronic devices. The results indicated that the SMFC-PMS system could be applied as a long-term and effective tool to simultaneously stimulate the bioremediation of the contaminated sediments and supply power for commercial devices. © 2014 Elsevier Ltd. Source


Sun W.,Guangdong Institute of Microbiology | Sun W.,South China University of Technology | Sun W.,State Key Laboratory of Applied Microbiology Southern China | Xia C.,Guangdong Institute of Microbiology | And 8 more authors.
Microbiological Research | Year: 2014

Anaerobic ammonium-oxidizing (anammox) process has recently been recognized as an important pathway for removing fixed nitrogen (N) from aquatic ecosystems. Anammox organisms are widely distributed in freshwater environments. However, little is known about their presence in the water column of riverine ecosystems. Here, the existence of a diverse anammox community was revealed in the water column of the Dongjiang River by analyzing 16S rRNA and hydrazine oxidation (hzo) genes of anammox bacteria. Phylogenetic analyses of hzo genes showed that Candidatus Jettenia related clades of anammox bacteria were dominant in the river, suggesting the ecological microniche distinction from freshwater/estuary and marine anammox bacteria with Ca. Brocadia and Kuenenia genera mainly detected in freshwater/estuary ecosystems, and Ca. Scalindua genus mainly detected in marine ecosystems. The abundance and diversity of anammox bacteria along the river were both significantly correlated with concentrations of NH4 +-N based on Pearson and partial correlation analyses. Redundancy analyses showed the contents of NH4 +-N, NO3 --N and the ratio of NH4 +-N to NO2 --N significantly influenced the spatial distributions of anammox bacteria in the water column of the Dongjiang River. These results expanded our understanding of the distribution and potential roles of anammox bacteria in the water column of the river ecosystem. © 2014 Elsevier GmbH. Source

Discover hidden collaborations