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| 1 | Enhancement of Rhodobacter sphaeroides growth and carotenoid production through biostimulation显示文摘Bacillus thuringiensis/cereus L2 was added as a biostimulant to enhance the biomass accumulation and carotenoid yield of Rhodobacter sphaeroides using wastewater as the culturing medium. Results showed that biostimulation could significantly enhance the R. sphaeroides biomass production and carotenoid yield. The optimal biostimulant proportion was 40 μL(about 6.4 × 105CFU). Through the use of biostimulation, chemical oxygen demand removal, R. sphaeroides biomass production, carotenoid concentration, and carotenoid yield were improved by 178%, 67%, 214%, and 70%, respectively. Theoretical analysis revealed that there were two possible reasons for such increases. One was that biostimulation enhanced the R. sphaeroides wastewater treatment efficiency. The other was that biostimulation significantly decreased the peroxidase activity in R. sphaeroides. The results showed that the highest peroxidase activity dropped by 87% and the induction ratio of the RSP_3419 gene was 3.1 with the addition of biostimulant. The enhanced carotenoid yield in R. sphaeroides could thus be explained by a decrease in peroxidase activity. | Shuli Liu Guangming Zhang Xiangkun Li Pan Wu Jie Zhang | 2015 | Journal of Environmental Sciences2015，27，7： | 3 |
| 2 | Impacts of Fe2+on 5-aminolevulinic acid(ALA)biosynthesis of Rhodobacter sphaeroides in wastewater treatment by regulating nif gene expression显示文摘This study aimed to increase bacterial growth and 5-aminolevulinic acid(ALA) biosynthesis of Rhodobacter sphaeroides in wastewater treatment through adding ferrous ion( Fe^(2+) ). Results demonstrated that Fe^(2+) effectively enhanced the biomass production and ALA yield of R. sphaeroides. Moreover, the optimal Fe^(2+) dosage was found to be 400 μmol/L, which was associated with the highest biomass of 4015.3 mg/L and maximum ALA yield of 15.9 mg/g-dry cell weight(mg/g-DCW). Mechanism analysis revealed that Fe^(2+) vastly improved Adenosine Triphosphate(ATP) production by up-regulating the nif gene expression, and increasing ATP enhanced the biomass and ALA yield by supplying energy for bacterial growth and ALA biosynthesis, respectively. Correlation analysis showed that the ALA and ATP yields had positive relation with nifA and nifU gene expression. In addition, the nifA and nifU gene expression displayed high consistency of co-transcription at the optimal Fe^(2+) dosage. | Shuli Liu Zhihong Zheng Jingxi Tie Jia Kang Guangming Zhang Jie Zhang | 2018 | Journal of Environmental Sciences2018，30，8： | 1 |
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