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Effect of pH values on the extracellular polysaccharide secreted by Acidithiobacillus ferrooxidans during chalcopyrite bioleaching 被引量:4
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作者 Run-lan Yu Jing Liu +5 位作者 Jian-xi Tan Wei-min Zeng li-juan shi Guo-hua Gu Wen-qing Qin Guan-zhou Qiu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第4期311-316,共6页
The pH value plays an important role in the bioleaching of sulphide minerals. The effect of pH values on the extracellular poly-saccharide secreted by Acidithiobacillus ferrooxidans was investigated in different phase... The pH value plays an important role in the bioleaching of sulphide minerals. The effect of pH values on the extracellular poly-saccharide secreted by Acidithiobacillus ferrooxidans was investigated in different phases of bacterial growth during chalcopyrite bioleach-ing. It is found that extracellular polysaccharide secretion from the cells attached to chalcopyrite is more efficiently than that of the free cells in the bioleaching solution. Three factors, pH values, the concentration of soluble metal ions, and the bacterial growth and metabolism, affect extracellular polysaccharide secretion in the free cells, and are related to the bacterial growth phase. Extracellular polysaccharide secretion from the attached cells is mainly dependent on the pH value of the bacterial culture. 展开更多
关键词 CHALCOPYRITE BIOLEACHING POLYSACCHARIDES ACIDITY Acidithiobacillusferrooxidans
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Effects of processing pH stimulation on cooperative bioleaching of chalcopyrite concentrate by free and attached cells 被引量:2
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作者 Tang-jian PENG li-juan shi +5 位作者 Run-lan YU Guo-hua GU Dan ZHOU Miao CHEN Guan-zhou QIU Wei-min ZENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第8期2220-2229,共10页
In order to investigate the effects of processing pH stimulation on bioleaching of chalcopyrite by moderate thermophiles,copper leaching rates and the dynamics of microbial community structures of free and attached ce... In order to investigate the effects of processing pH stimulation on bioleaching of chalcopyrite by moderate thermophiles,copper leaching rates and the dynamics of microbial community structures of free and attached cells were monitored. The results indicated that when the processing pH values were respectively adjusted to 1.0 and 3.0 on day 14, both free and attached cells experienced an adaptive phase. Meanwhile, the copper leaching rates were 86.9% and 64.0%,respectively, as opposed to a copper leaching rate of 87.5% in the control group without pH stimulation. Quantitative real-time polymerase chain reaction (qRT-PCR) analysis suggested that pH stimulation imposed less impact on the attached organisms than on the free cells, indicating that the attached cells were more resistant to processing pH stimulation than the free cells. Furthermore, adjusting processing pH to 3.0 significantly disrupted both free and attached microbial communities, and the bioleaching system could not recover to the normal status as the control group. 展开更多
关键词 CHALCOPYRITE processing pH stimulation free cells attached cells microbial community real-time quantitative PCR
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Dynamics of traveling wave solutions to a highly nonlinear Fujimoto–Watanabe equation
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作者 li-juan shi Zhen-Shu Wen 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第4期51-55,共5页
In this work, we apply the bifurcation method of dynamical systems to investigate the underlying complex dynamics of traveling wave solutions to a highly nonlinear Fujimoto–Watanabe equation. We identify all bifurcat... In this work, we apply the bifurcation method of dynamical systems to investigate the underlying complex dynamics of traveling wave solutions to a highly nonlinear Fujimoto–Watanabe equation. We identify all bifurcation conditions and phase portraits of the system in different regions of the three-dimensional parametric space, from which we present the sufficient conditions to guarantee the existence of traveling wave solutions including solitary wave solutions, periodic wave solutions, kink-like(antikink-like) wave solutions, and compactons. Furthermore, we obtain their exact expressions and simulations, which can help us understand the underlying physical behaviors of traveling wave solutions to the equation. 展开更多
关键词 HIGHLY NONLINEAR Fujimoto–Watanabe EQUATION DYNAMICS traveling wave solutions BIFURCATIONS
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Dynamical behaviors of traveling wave solutions to a Fujimoto-Watanabe equation
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作者 Zhen-Shu Wen li-juan shi 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第9期162-165,共4页
We study dynamical behaviors of traveling wave solutions to a Fujimoto-Watanabe equation using the method of dynamical systems. We obtain all possible bifurcations of phase portraits of the system in different regions... We study dynamical behaviors of traveling wave solutions to a Fujimoto-Watanabe equation using the method of dynamical systems. We obtain all possible bifurcations of phase portraits of the system in different regions of the threedimensional parameter space. Then we show the required conditions to guarantee the existence of traveling wave solutions including solitary wave solutions, periodic wave solutions, kink-like(antikink-like) wave solutions, and compactons. Moreover, we present exact expressions and simulations of these traveling wave solutions. The dynamical behaviors of these new traveling wave solutions will greatly enrich the previews results and further help us understand the physical structures and analyze the propagation of nonlinear waves. 展开更多
关键词 dynamical behaviors traveling wave solutions Fujimoto-Watanabe equation bifurcations
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Bifurcations and Dynamics of Traveling Wave Solutions to a Fujimoto-Watanabe Equation 被引量:1
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作者 li-juan shi Zhen-Shu Wen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第6期631-636,共6页
In this paper, we study the bifurcations and dynamics of traveling wave solutions to a Fujimoto-Watanabe equation by using the method of dynamical systems. We obtain a11 possible bifurcations of phase portraits of the... In this paper, we study the bifurcations and dynamics of traveling wave solutions to a Fujimoto-Watanabe equation by using the method of dynamical systems. We obtain a11 possible bifurcations of phase portraits of the system in different regions of the parametric space. Then we show the sufficient conditions to guarantee the existence of traveling wave solutions including solitary wave solutions, periodic wave solutions, eompactions and kink-like and antikink-like wave solutions. Moreover, the expressions of solitary wave solutions and periodic wave solutions are implicitly given, while the expressions of kink-like and antikink-like wave solutions are explicitly shown. The dynamics of these new traveling wave solutions will greatly enrich the previews results and further help us understand the physical structures and analyze the propagation of the nonlinear wave. 展开更多
关键词 Fujimoto-Watanabe equation traveling wave solutions BIFURCATIONS DYNAMICS
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