为从环境中筛选新的β-葡萄糖苷酶生产菌株,利用筛选平板涂布法从腐败的甘蔗叶中筛选目的菌株,从中筛选到1株能产β-葡糖糖苷酶的菌株PJD-1-1,16S r DNA鉴定该菌株为新型的土壤农杆菌。该菌株在20℃,初始p H 7.0,以乳糖为碳源,NaNO_3为...为从环境中筛选新的β-葡萄糖苷酶生产菌株,利用筛选平板涂布法从腐败的甘蔗叶中筛选目的菌株,从中筛选到1株能产β-葡糖糖苷酶的菌株PJD-1-1,16S r DNA鉴定该菌株为新型的土壤农杆菌。该菌株在20℃,初始p H 7.0,以乳糖为碳源,NaNO_3为氮源的条件下,其酶活性最高为3.92 U/mg。经硫酸铵沉淀、葡聚糖凝胶过滤层析和离子交换层析纯化后(纯化倍数4.85,得率8.0%),SDA-PAGE分析表明得到一条分子量大小为40 k Da条带;该酶的最适反应温度和pH分别为50℃和8.0;在低于50℃条件下保有较好的稳定性;Hg^(2+)和Ag^+对酶活性有明显的抑制作用,表明该酶的催化活性中心可能含有硫醇基,Ba^(2+)、Ca^(2+)、Pb^(2+)、Co^(2+)、Zn^(2+)、Mn^(2+)、Na^+、K^+、EDTA和尿素对酶活性没有明显的影响。该酶的温度稳定性、碱性特征以及对金属离子的耐受性等使其在食品及其他领域具有广泛的应用潜力。展开更多
Six years since the so called“Arab Spring”,this article looks at the two Islamist parties that have since then-although under different circumstances-been key political actors both in Tunisia and Morocco,respectivel...Six years since the so called“Arab Spring”,this article looks at the two Islamist parties that have since then-although under different circumstances-been key political actors both in Tunisia and Morocco,respectively.It analyses,in a comparative perspective,the economic programs that the PJD in Morocco and Ennahda in Tunisia proposed during their electoral campaigns,along with the policies they implemented.By looking at their platforms and performance,the article investigates the gap between discourses and practices in order to assess to what extent contingent needs and the interplay with other political and social actors impact on Islamists’ideological perspectives and their capacity to meet societal demands.展开更多
基金Fund for Agro-scientific Research in the Public Interest(201203072)Natural Science Foundation of Jiangxi Province(20142BAB214010)Research and Development Projects of Jiangxi Province(20161BBF60138)~~
文摘为从环境中筛选新的β-葡萄糖苷酶生产菌株,利用筛选平板涂布法从腐败的甘蔗叶中筛选目的菌株,从中筛选到1株能产β-葡糖糖苷酶的菌株PJD-1-1,16S r DNA鉴定该菌株为新型的土壤农杆菌。该菌株在20℃,初始p H 7.0,以乳糖为碳源,NaNO_3为氮源的条件下,其酶活性最高为3.92 U/mg。经硫酸铵沉淀、葡聚糖凝胶过滤层析和离子交换层析纯化后(纯化倍数4.85,得率8.0%),SDA-PAGE分析表明得到一条分子量大小为40 k Da条带;该酶的最适反应温度和pH分别为50℃和8.0;在低于50℃条件下保有较好的稳定性;Hg^(2+)和Ag^+对酶活性有明显的抑制作用,表明该酶的催化活性中心可能含有硫醇基,Ba^(2+)、Ca^(2+)、Pb^(2+)、Co^(2+)、Zn^(2+)、Mn^(2+)、Na^+、K^+、EDTA和尿素对酶活性没有明显的影响。该酶的温度稳定性、碱性特征以及对金属离子的耐受性等使其在食品及其他领域具有广泛的应用潜力。
文摘Six years since the so called“Arab Spring”,this article looks at the two Islamist parties that have since then-although under different circumstances-been key political actors both in Tunisia and Morocco,respectively.It analyses,in a comparative perspective,the economic programs that the PJD in Morocco and Ennahda in Tunisia proposed during their electoral campaigns,along with the policies they implemented.By looking at their platforms and performance,the article investigates the gap between discourses and practices in order to assess to what extent contingent needs and the interplay with other political and social actors impact on Islamists’ideological perspectives and their capacity to meet societal demands.
