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Activated sludge metagenome

ABSTRACT: Microbial Community Responses to Cyanide Loading in A Biological Cyanide-containing Wastewater Treatment Reactor for Gold Mill Effluent

PROVIDER: PRJDB5810 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	DRR093224.fastq.gz	Fastqsanger.gz
	DRR093225.fastq.gz	Fastqsanger.gz
	DRR093226.fastq.gz	Fastqsanger.gz
	DRR093227.fastq.gz	Fastqsanger.gz
	DRR093228.fastq.gz	Fastqsanger.gz

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Project description:Transcriptional analysis of the cyanotroph Pseudomonas pseudoalcaligenes CECT5344 in response to cyanide present in wastewaters from industrial activities, such as jewelry and electroplating activities Four-conditions experiment, including three different nitrogen sources (ammonium, sodium cyanide or a cyanide-containing wastewater). One experiment without nitrogen added to the media (nitrogen limited condition). Four biological replicates for each condition (added nitrogen source to the media) plus the experiment without nitrogen source added.

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Project description:Pure cultures of ammonia oxidizing bacterium, Nitrosomonas europaea, are exposed to cyanide in pseudo-steady state batch reactor in presence of ammonia. Nitrosomonas europaea are generally regarded as the most sensitive organism to various inhibitors commonly encountered in the wastewater treatment plants (WWTP). To find stress genes of Nitrosomonas europaea to cyanide known as inhibitor of respiratory process, whole-genome transcript response to cyanide was determined in this research using microarray and qRT-PCR. When 1 uM NaCN inhibits nitrification about 50 %, transcript levels of 35 genes were increased while transcript levels of 29 genes were decreased, showing more than 2-fold in total 2460 genes. moeZ (NE2353), homologue with rhodanases related to detoxification of CN-, showed 7-fold up regulation and gene cluster including moeZ also showed significant up regulation. Keywords: cyanide, stress response, moeZ

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Project description:Biological treatments to degrade cyanide are a powerful technology for cyanide removal from industrial wastewaters. It has been previously demonstrated that the alkaliphilic bacterium Pseudomonas pseudoalcaligenes CECT5344 is able to use free cyanide and several metal-cyanide complexes as the sole nitrogen source. In this work, the strain CECT5344 has been used for detoxification of the different chemical forms of cyanide that are present in alkaline wastewaters from the jewelry industry. This liquid residue also contains large concentrations of metals like iron, copper and zinc, making this wastewater even more toxic. To elucidate the molecular mechanisms involved in the bioremediation process, a quantitative sRNA sequencing analysis has been carried out in P. pseudoalcaligenes CECT5344 cells grown with the jewelry residue, free cyanide and ammonium as sole nitrogen sources.

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