Comparing compositions of the fluid inclusions in volcanic rocks to the contents and isotopes of the gases in corresponding volcanic reservoirs using microthermometry, Raman microspectroscopy and mass spectrum analysi...Comparing compositions of the fluid inclusions in volcanic rocks to the contents and isotopes of the gases in corresponding volcanic reservoirs using microthermometry, Raman microspectroscopy and mass spectrum analysis, we found that： （1） up to 82 mole% methane exists in the primary inclusions hosted in the reservoir volcanic rocks; （2） high CH4 inclusions recognized in the volcanic rocks correspond to CH4-bcaring CO2 reservoirs that are rich in helium and with a high ^3He/^4He ratio and which show reversed order of 813C in alkane; （3） in gas reservoirs of such abiotic methane （〉80%） and a mix of CH4 and CO2, the enclosed content of CH4 in the volcanic inclusions is usually below 42 mole%, and the reversed order of δ^13C in alkane is sometimes irregular in the corresponding gas pools; （4） a glassy inclusion with a homogeneous temperature over 900℃ also contains a small portion of CH4 although predominantly CO2. This affinity between gas pool and content of inclusion in the same volcanic reservoirs demonstrates that magma-originated gases, both CH4 and CO2, have contributed significantly to the corresponding gas pools and that the assumed hydrocarbon budget of the bulk earth might be much larger than conventionally supposed.展开更多
目的对比低位直肠癌保肛手术采用延迟结肛吻合与一期吻合的治疗效果。方法检索PubMed、Embase、Web of Science、Cochrane Library、中国知网、万方数据库已公开发表的有关比较低位直肠癌保肛手术延迟结肛吻合与一期吻合近远期疗效的临...目的对比低位直肠癌保肛手术采用延迟结肛吻合与一期吻合的治疗效果。方法检索PubMed、Embase、Web of Science、Cochrane Library、中国知网、万方数据库已公开发表的有关比较低位直肠癌保肛手术延迟结肛吻合与一期吻合近远期疗效的临床研究。提取的数据使用R4.2.0和RevMan 5.3软件进行Meta分析。结果共有14篇文献纳入汇总分析,包括2篇随机对照研究和12篇病例对照研究。总样本量为1079例。包括延迟吻合组495例,一期吻合组584例。汇总结果显示,延迟吻合组术后总体并发症(OR=0.57,95%CI 0.40~0.82,P=0.002)和术后吻合口相关并发症(OR=0.32,95%CI 0.15~0.69,P=0.003)均优于一期吻合组。两组在手术时间、术中出血量和术后1年肛门功能Wexner评分方面差异无统计学意义。结论低位直肠癌采用延迟结肛吻合相比一期吻合+末段回肠预防性造口有利于降低总体并发症和吻合口相关并发症。因此,对于有吻合口漏高危因素的患者可以考虑采用延迟结肛吻合。展开更多
文摘Comparing compositions of the fluid inclusions in volcanic rocks to the contents and isotopes of the gases in corresponding volcanic reservoirs using microthermometry, Raman microspectroscopy and mass spectrum analysis, we found that： （1） up to 82 mole% methane exists in the primary inclusions hosted in the reservoir volcanic rocks; （2） high CH4 inclusions recognized in the volcanic rocks correspond to CH4-bcaring CO2 reservoirs that are rich in helium and with a high ^3He/^4He ratio and which show reversed order of 813C in alkane; （3） in gas reservoirs of such abiotic methane （〉80%） and a mix of CH4 and CO2, the enclosed content of CH4 in the volcanic inclusions is usually below 42 mole%, and the reversed order of δ^13C in alkane is sometimes irregular in the corresponding gas pools; （4） a glassy inclusion with a homogeneous temperature over 900℃ also contains a small portion of CH4 although predominantly CO2. This affinity between gas pool and content of inclusion in the same volcanic reservoirs demonstrates that magma-originated gases, both CH4 and CO2, have contributed significantly to the corresponding gas pools and that the assumed hydrocarbon budget of the bulk earth might be much larger than conventionally supposed.
