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1

Characteristic studies of micron zinc particle hydrolysis in a fixed bed reactor

100%
Lv M., Liu H., Nie X., Ashraf M. A.
Polish Maritime Research
|
2015
|
tom 22
|
nr Special Issue S1
Zinc fuel is considered as a kind of promising energy sources for marine propeller. As one of the key steps for zinc marine energy power system, zinc hydrolysis process had been studied experimentally in a fixed bed reactor. In this study, we focus on the characteristics of micron zinc particle hydrolysis. The experimental results suggested that the steam inner diffusion is the controlling step of accumulative zinc particles hydrolysis reaction at a relative lower temperature and a relative higher water partial pressure. In other conditions, the chemical reaction kinetics was the controlling step. And two kinds of chemical reaction kinetics appeared in experiments: the surface reaction and the gas-gas reaction. The latter one occurs usually for larger zinc particles and high reaction temperature. Temperature seems to be one of the most important parameters for the dividing of different reaction mechanisms. Several parameters of the hydrolysis process including heating rate, water partial pressure, the particle size and temperature were also studied in this paper. Results show that the initial reaction temperature of zinc hydrolysis in fixed bed is about 410 oC. And the initial reaction temperature increases as the heating rate increases and as the water partial pressure decreases. The total hydrogen yield increases as the heating rate decreases, as the water partial pressure increases, as the zinc particle size decreases, and as the reaction temperature increases. A hydrogen yield of more than 81.5% was obtained in the fixed bed experiments
2

Human neutrophil peptide 3 could be functionally expressed in Rhodobacter sphaeroides

88%
Nie X., Zhang L., Hu Z., Liu Y., Zhao Z.
Acta Biochimica Polonica
|
2015
|
tom 62
|
nr 2
3

High - grade mutant OmpF induces decreased bacterial survival rate

76%
Zhao Z., Liu T., Zhang L., Luo M., Nie X., Li Z., Pan Y.
Acta Biochimica Polonica
|
2014
|
tom 61
|
nr 2
 OmpF plays very important roles in the influx of antibiotics and bacterial survival in the presence of antibiotics. However, high-grade mutant OmpF and its function in decreasing bacterial survival rate have not been reported to date. In the present study, we cloned a high-grade mutant OmpF (mOmpF) and sequence analysis suggested that over 45 percent of the DNA sequence was significantly mutated, leading to dramatic changes in over 55 percent of the amino acid sequence. mOmpF protein was successfully expressed. When grown in the presence of antibiotic, the bacterial survival rate decreased and the antibiotic inhibition zone became larger with the increase of the mOmpF. It was concluded that concentration of high-grade mutant mOmpF dramatically influenced the bacterial survival rate. The study presented here may provide insights into better understanding of the relationships between structure and function of OmpF.
4

Reduction and enrichment of uranium after biosorption on inactivated Saccharomyces cerevisiae

64%
Zhang W., Dong F., Liu M., Song H., Nie X., Huo T., Zhao Y., Wang P., Qin Y., Zhou L.
Polish Journal of Environmental Studies
|
2020
|
tom 29
|
nr 2
5

Interactive effect of radioactive and heavy-metal contamination on soil enzyme activity in a former uranium mine

64%
Yang G., Dong F., Liu M., Nie X., Zong M., Peng C., Chen H., Wei H., Wang P., Zhang W.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 3
Radioactivity and heavy metal toxicity of multi-metal deposits coexisting with the element uranium (U) could have long-term adverse impacts on soil biological processes and the health of soil ecosystems. Soil enzyme activities are considered bioindicators for assessing soil health. An experiment was designed to investigate invertase and ß-glucosidase activity in multi-metal deposits. Radioactivity and heavy metals were also investigated during this study. Our results showed that the invertase and ß-glucosidase activities were significantly lower in the core mining area than the control area (p<0.05). Activities of the two enzymes decreased with increasing metal concentrations and radioactivity. Cu and Zn showed significant negative effects on ß-glucosidase and invertase activities in a multi-metal deposit at the study site. A significant nonlinear relationship was recorded between soil enzyme activities, radiation dose (R² = 0.71, 0.63; p<0.05), Zn (R² = 0.34, 0.41; p<0.05) and Cu concentrations (R² = 0.46, 0.45; p<0.05). There were turning points at 1 μGy h⁻¹, 250 μg g⁻¹, and 30 μg g⁻¹ for radiation dose, Zn and Cu contents, respectively. The findings could provide more information regarding the toxic effects of radiation and heavy metals on the soil health of multi-metal deposits, which can more precisely guide environmental protection.
6

Characterization of arsenic and uranium pollution surrounding a uranium mine in southwestern China and phytoremediation potential

52%
Li R., Dong F., Yang G., Zhang W., Zong M., Nie X., Zhou L., Babar A., Liu J., Ram B. K., Fan C., Zeng Y.
Polish Journal of Environmental Studies
|
2020
|
tom 29
|
nr 1
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