The Late Permian was marked by a series of important geological events and widespread organic-rich black shale depositions,acting as important unconventional hydrocarbon source rocks.However,the mechanism of organic m...The Late Permian was marked by a series of important geological events and widespread organic-rich black shale depositions,acting as important unconventional hydrocarbon source rocks.However,the mechanism of organic matter(OM)enrichment throughout this period is still controversial.Based on geochemical data,the marine redox conditions,paleogeographic and hydrographic environment,primary productivity,volcanism,and terrigenous input during the Late Permian in the Lower Yangtze region have been studied from the Putaoling section,Chaohu,to provide new insights into OM accumulation.Five Phases are distinguished based on the TOC and environmental variations.In Phase I,anoxic conditions driven by water restriction enhanced OM preservation.In Phase II,euxinic and cycling hydrological environments were the two most substantial controlling factors for the massive OM deposition.During Phase III,intensified terrestrial input potentially diluted the OM in sediment and the presence of oxygen in bottom water weakened the preservation condition.Phase IV was characterized by a relatively higher abundance of mercury(Hg)and TOC(peak at 16.98 wt%),indicating that enhanced volcanism potentially stimulated higher productivity and a euxinic environment.In Phase V,extremely lean OM was preserved as a result of terrestrial dilutions and decreasing primary productivity.Phases I,II and IV are characterized as the most prominent OM-rich zones due to the effective interactions of the controlling factors,namely paleogeographic,hydrographic environment,volcanism,and redox conditions.展开更多
目的系统评价针灸对体外受精与胚胎移植妊娠结局的影响。方法计算机检索中国知网、万方、维普、中国生物医学文献数据库及PubMed、Web of Science、Cochrane Library和Embase数据库,全面搜索针灸辅助体外受精与胚胎移植的RCTs,检索时限...目的系统评价针灸对体外受精与胚胎移植妊娠结局的影响。方法计算机检索中国知网、万方、维普、中国生物医学文献数据库及PubMed、Web of Science、Cochrane Library和Embase数据库,全面搜索针灸辅助体外受精与胚胎移植的RCTs,检索时限为建库至2023年12月31日。由2名研究员独立筛选文献、提取资料、分析文献;采用Cochrane偏倚风险评估工具对纳入文献进行质量评估,统计分析软件Stata16.0对数据进行Meta分析。结果最终纳入28篇文献,共1315例患者。Meta分析结果显示:针灸辅助在IVF-ET的临床妊娠率、着床率、持续妊娠率、活产率、植入率、生化妊娠率等方面优于单纯性IVF-ET,在自然流产率方面二者疗效相当。结论当前有限证据表明,针灸能够改善体外受精-胚胎移植的妊娠结局,但所纳入的研究数量和质量都有限,所以还需要更高质量的RCTs进行验证,为针灸在辅助生殖领域的应用提供更可靠的循证证据。展开更多
基金supported by the Fundamental and Commonwealth Geological Survey of Oil and Gas of China(Grant No.DD 20221662)the National Natural Science Foundation of China(NSFC)Program(Grant No.42302124).
文摘The Late Permian was marked by a series of important geological events and widespread organic-rich black shale depositions,acting as important unconventional hydrocarbon source rocks.However,the mechanism of organic matter(OM)enrichment throughout this period is still controversial.Based on geochemical data,the marine redox conditions,paleogeographic and hydrographic environment,primary productivity,volcanism,and terrigenous input during the Late Permian in the Lower Yangtze region have been studied from the Putaoling section,Chaohu,to provide new insights into OM accumulation.Five Phases are distinguished based on the TOC and environmental variations.In Phase I,anoxic conditions driven by water restriction enhanced OM preservation.In Phase II,euxinic and cycling hydrological environments were the two most substantial controlling factors for the massive OM deposition.During Phase III,intensified terrestrial input potentially diluted the OM in sediment and the presence of oxygen in bottom water weakened the preservation condition.Phase IV was characterized by a relatively higher abundance of mercury(Hg)and TOC(peak at 16.98 wt%),indicating that enhanced volcanism potentially stimulated higher productivity and a euxinic environment.In Phase V,extremely lean OM was preserved as a result of terrestrial dilutions and decreasing primary productivity.Phases I,II and IV are characterized as the most prominent OM-rich zones due to the effective interactions of the controlling factors,namely paleogeographic,hydrographic environment,volcanism,and redox conditions.
文摘目的系统评价针灸对体外受精与胚胎移植妊娠结局的影响。方法计算机检索中国知网、万方、维普、中国生物医学文献数据库及PubMed、Web of Science、Cochrane Library和Embase数据库,全面搜索针灸辅助体外受精与胚胎移植的RCTs,检索时限为建库至2023年12月31日。由2名研究员独立筛选文献、提取资料、分析文献;采用Cochrane偏倚风险评估工具对纳入文献进行质量评估,统计分析软件Stata16.0对数据进行Meta分析。结果最终纳入28篇文献,共1315例患者。Meta分析结果显示:针灸辅助在IVF-ET的临床妊娠率、着床率、持续妊娠率、活产率、植入率、生化妊娠率等方面优于单纯性IVF-ET,在自然流产率方面二者疗效相当。结论当前有限证据表明,针灸能够改善体外受精-胚胎移植的妊娠结局,但所纳入的研究数量和质量都有限,所以还需要更高质量的RCTs进行验证,为针灸在辅助生殖领域的应用提供更可靠的循证证据。
