目的:系统评价扩大淋巴结切除与标准淋巴结切除的胰十二指肠切除术治疗胰头癌的有效性与安全性。方法:计算机检索Cochrane Library(2016年第8期)、Pub Med、EMBASE、Web of Science、万方数据库和CNKI数据库,由2名评价员独立筛选文献、...目的:系统评价扩大淋巴结切除与标准淋巴结切除的胰十二指肠切除术治疗胰头癌的有效性与安全性。方法:计算机检索Cochrane Library(2016年第8期)、Pub Med、EMBASE、Web of Science、万方数据库和CNKI数据库,由2名评价员独立筛选文献、提取资料并评价偏倚风险后,对纳入的5篇随机对照试验采用RevMan 5.3软件进行Meta分析,根据文献内容分为扩大淋巴结切除组(Extended组)和标准淋巴结切除组(Standard组)。结果:Meta分析结果显示,与Standard组比较,Extended组手术时间(MD=-46.34,95%CI:-71.26～-21.41,P=0.0003)和术后住院时间(MD=-2.22,95%CI:-2.41～-2.03,P<0.0001)明显增加;Standard组R0切除率明显高于Extended组(OR=0.57,95%CI:0.36～0.92,P=0.02)。术中失血量及术后死亡率两组差异无统计学意义(P>0.05)。结论:对胰头癌行扩大淋巴结切除的胰十二指肠切除对于本身可切除的胰头癌患者而言并未获益,其死亡率、术中失血量与行标准淋巴结切除相比并无明显差别,反而增加手术时间及住院时间。展开更多
The energy metabolism structure of microbial community plays an important role in the process of biohydrometallurgy.In this article,an artificial microbial community composed of three strains(Acidithiobacillus ferroox...The energy metabolism structure of microbial community plays an important role in the process of biohydrometallurgy.In this article,an artificial microbial community composed of three strains(Acidithiobacillus ferrooxidans,Leptospirillum ferriphilum and Acidithiobacillus thiooxidans)was used to leach three kinds of chalcopyrites with different iron-sulfur ratios.After 36 d of leaching,the chalcopyrite with iron-sulfur ratio of about 1:1 achieved the highest copper extraction(69.62%).In the early stage,iron oxidizing bacteria predominated,and the expression of rus and rio was 8 times higher than that in the late stage.In the late stage,sulfur oxidizing bacteria predominated,and the expression of tetH and HdrAB was 4 times higher than that in the early stage.Furthermore,the three bioleaching systems above were added with elemental sulfur(3 g/L);the chalcopyrite with iron-sulfur ratio of about 2:1 achieved the highest copper extraction(80.63%).The results suggest that the energy metabolism structure of the microbial community could be changed by changing the iron-sulfur ratio during the leaching process for improving the leaching efficiency of chalcopyrite.展开更多
基金Project(2017zzts382)supported by Central South University Postgraduate Independent Exploration and Innovation,ChinaProject(2014jpkc003)supported by Central South University Graduate Excellent Course,China+1 种基金Project(2015JJ2165)supported by Hunan Provincial Natural Science Foundation of ChinaProject(165611031)supported by Central South University Fundamental Research Funds Special Funding,China。
文摘The energy metabolism structure of microbial community plays an important role in the process of biohydrometallurgy.In this article,an artificial microbial community composed of three strains(Acidithiobacillus ferrooxidans,Leptospirillum ferriphilum and Acidithiobacillus thiooxidans)was used to leach three kinds of chalcopyrites with different iron-sulfur ratios.After 36 d of leaching,the chalcopyrite with iron-sulfur ratio of about 1:1 achieved the highest copper extraction(69.62%).In the early stage,iron oxidizing bacteria predominated,and the expression of rus and rio was 8 times higher than that in the late stage.In the late stage,sulfur oxidizing bacteria predominated,and the expression of tetH and HdrAB was 4 times higher than that in the early stage.Furthermore,the three bioleaching systems above were added with elemental sulfur(3 g/L);the chalcopyrite with iron-sulfur ratio of about 2:1 achieved the highest copper extraction(80.63%).The results suggest that the energy metabolism structure of the microbial community could be changed by changing the iron-sulfur ratio during the leaching process for improving the leaching efficiency of chalcopyrite.
