给水厂废弃铁铝泥(Ferric and aluminum residuals,FARs)可用于控制湖泊沉积物磷释放.因此,在实际应用之前对FARs的风险进行评估非常重要.本研究通过室内富集实验,考察FARs对沉积物中氨氧化菌(ammonia-oxidizing bacteria,AOB)活性、丰...给水厂废弃铁铝泥(Ferric and aluminum residuals,FARs)可用于控制湖泊沉积物磷释放.因此,在实际应用之前对FARs的风险进行评估非常重要.本研究通过室内富集实验,考察FARs对沉积物中氨氧化菌(ammonia-oxidizing bacteria,AOB)活性、丰度和多样性的影响.结果表明:投加FARs后,沉积物对氨氮的去除能力微弱提高.富集后沉积物中AOB丰度增加,投加FARs的沉积物中AOB丰度达到1.32×108copies·g-1,而未投加FARs的沉积物中AOB丰度为1.14×108copies·g-1.此外,amo A基因的系统发育分析表明富集前后沉积物中的AOB均附属于Nitrosospira和Nitrosomonas两个种属,并且投加FARs沉积物中AOB的多样性略高于未投加的.综上结果表明,FARs回用于湖泊富营养化控制的同时,将有益于沉积物中好氧氨氧化作用的进行.展开更多
This essay is a short comment on the newly published book by Dr. Liu Ji,Class versus Generation Cleavages:A Comparative Analysis of the Politics of Pension Reform in European Welfare States,one of the monographs thoro...This essay is a short comment on the newly published book by Dr. Liu Ji,Class versus Generation Cleavages:A Comparative Analysis of the Politics of Pension Reform in European Welfare States,one of the monographs thoroughly exploring the welfare crisis in west European countries since the 1990s. The author focuses on the roles of the various social coalitions with veto powers during the retrenchment process of public pensions in 5 European countries. He finds out the causal relationship between the intensity of family support for the elderly and the formation of various social coalitions by use of extensive empirical evidence. Starting with a review of the paradigm used in this book,that is,social coalition,this article makes an overall exploration of its argumentation process,then points out the existing shortcomings and finally makes a critical comment on the author’s emphasis on the model of family support for the elderly.展开更多
文摘This essay is a short comment on the newly published book by Dr. Liu Ji,Class versus Generation Cleavages:A Comparative Analysis of the Politics of Pension Reform in European Welfare States,one of the monographs thoroughly exploring the welfare crisis in west European countries since the 1990s. The author focuses on the roles of the various social coalitions with veto powers during the retrenchment process of public pensions in 5 European countries. He finds out the causal relationship between the intensity of family support for the elderly and the formation of various social coalitions by use of extensive empirical evidence. Starting with a review of the paradigm used in this book,that is,social coalition,this article makes an overall exploration of its argumentation process,then points out the existing shortcomings and finally makes a critical comment on the author’s emphasis on the model of family support for the elderly.
