A novel bioactive foam emulsion bioreactor for benzene,toluene and xylene(BTX)contaminated air streams treatment has been developed.The gas-liquid interfacial area by biocompatible foam and driving force for mass tran...A novel bioactive foam emulsion bioreactor for benzene,toluene and xylene(BTX)contaminated air streams treatment has been developed.The gas-liquid interfacial area by biocompatible foam and driving force for mass transfer by a water immiscible organic phase were increased in this reactor.The effect of several parameters such as gas residence time,oxygen content,and organic phase concentration on bioreactor performance was studied. Experimental results showed an average elimination capacity(EC)of 220 g·m3·h -1with removal efficiency(RE) of 89.59%for BTX inlet concentration of 1 g·m3at 15 s gas residence time in the bioreactor.The statistical developed model predicted that the maximum elimination capacity of the reactor for BTX could be reached to 423.45 g·m3·h -1.Continues operation of the bioreactor with high EC and RE was demonstrated by optimizing the operational parameters of the bioreactor.Overall the results suggest that the bioreactor developed can be very effective systems to treat BTX vapors.展开更多
Objective:To identify the biodiversity of Nocardia species isolated from the environments of Tehran hospitals via phenotypic and PCR molecular methods.Methods:A total of 236 samples were collected from the transplanta...Objective:To identify the biodiversity of Nocardia species isolated from the environments of Tehran hospitals via phenotypic and PCR molecular methods.Methods:A total of 236 samples were collected from the transplantation and cancer centers of five Tehran hospitals,and the presence of Nocardia was identified by using standard protocols.Conventional tests were used for preliminary identification,and PCR amplification of the 598 bp amplicon of the 16S rRNA and sequence analysis of 16S rRNA were performed for genus and species identification.Results:From the 236 soil samples,16 samples were identified as positive based on the culture tests,while 8 samples showed positive results based on the molecular method.The phylogenetic tree showed that the most frequent genus of Nocardia was related to Nocardia cyriacigeorgica.Conclusion:The hospital environment is a potential reservoir of a diverse range of Nocardia species.Due to the strong capability of survival,these bacteria bring a threat to the health of patients.Its identification can help physicians to implement treatments and is important for healthcare centers.展开更多
文摘A novel bioactive foam emulsion bioreactor for benzene,toluene and xylene(BTX)contaminated air streams treatment has been developed.The gas-liquid interfacial area by biocompatible foam and driving force for mass transfer by a water immiscible organic phase were increased in this reactor.The effect of several parameters such as gas residence time,oxygen content,and organic phase concentration on bioreactor performance was studied. Experimental results showed an average elimination capacity(EC)of 220 g·m3·h -1with removal efficiency(RE) of 89.59%for BTX inlet concentration of 1 g·m3at 15 s gas residence time in the bioreactor.The statistical developed model predicted that the maximum elimination capacity of the reactor for BTX could be reached to 423.45 g·m3·h -1.Continues operation of the bioreactor with high EC and RE was demonstrated by optimizing the operational parameters of the bioreactor.Overall the results suggest that the bioreactor developed can be very effective systems to treat BTX vapors.
基金This study was part of a PhD thesis supported by Tehran University of Medical Science(Grant No:34468270396).
文摘Objective:To identify the biodiversity of Nocardia species isolated from the environments of Tehran hospitals via phenotypic and PCR molecular methods.Methods:A total of 236 samples were collected from the transplantation and cancer centers of five Tehran hospitals,and the presence of Nocardia was identified by using standard protocols.Conventional tests were used for preliminary identification,and PCR amplification of the 598 bp amplicon of the 16S rRNA and sequence analysis of 16S rRNA were performed for genus and species identification.Results:From the 236 soil samples,16 samples were identified as positive based on the culture tests,while 8 samples showed positive results based on the molecular method.The phylogenetic tree showed that the most frequent genus of Nocardia was related to Nocardia cyriacigeorgica.Conclusion:The hospital environment is a potential reservoir of a diverse range of Nocardia species.Due to the strong capability of survival,these bacteria bring a threat to the health of patients.Its identification can help physicians to implement treatments and is important for healthcare centers.
