斑子麻黄(Ephedra rhytidosperma)群落是贺兰山山麓特有荒漠植物群落。该研究于2019年调查了16个斑子麻黄典型群落,分析了物种组成的区系特征,运用TWINSPAN软件对16个斑子麻黄群落进行了分类。结果表明:1)斑子麻黄群落物种组成以禾本科...斑子麻黄(Ephedra rhytidosperma)群落是贺兰山山麓特有荒漠植物群落。该研究于2019年调查了16个斑子麻黄典型群落,分析了物种组成的区系特征,运用TWINSPAN软件对16个斑子麻黄群落进行了分类。结果表明:1)斑子麻黄群落物种组成以禾本科、菊科、豆科和蒺藜科植物为主,隶属13科24属27种。2)斑子麻黄荒漠群落生活型以多年生草本(44.44%)和灌木(29.63%)为主;区系以古地中海成分(44.44%)和东亚成分(33.33%)为主;水分生态类型以旱生(40.74%)和强旱生(37.04%)为主。3)根据生活型和优势度,斑子麻黄群落可分为斑子麻黄-半灌木荒漠(Ephedra rhytidosperma-Semi-Shrub Desert)和斑子麻黄-草本荒漠(Ephedra rhytidosperma-Herb Desert) 2个群丛组,进一步划分为3个群丛:斑子麻黄-刺旋花-兴安胡枝子半灌木与草本荒漠(Ephedra rhytidosperma-Convolvulus tragacanthoides-Lespedeza davurica Semi-Shrub and Herb Desert)、斑子麻黄-刺旋花-中亚细柄茅半灌木与草本荒漠(Ephedra rhytidosperma-Convolvulus tragacanthoides-Ptilagrostis pelliotii Semi-Shrub and Herb Desert)和斑子麻黄-中亚细柄茅半灌木与草本荒漠(Ephedra rhytidosperma-Ptilagrostis pelliotii Semi-Shrub and Herb Desert)。展开更多
This paper concerns deals with the Mongolian regional stratigraphic classification of sedimentary, sedimentary-volcanogenic sediments, and metamorphic complex spread over the territory of Mongolia according to the new...This paper concerns deals with the Mongolian regional stratigraphic classification of sedimentary, sedimentary-volcanogenic sediments, and metamorphic complex spread over the territory of Mongolia according to the new International Chronostratigraphic Chart [1]. The regional stratigraphy of Precambrian-Cenozoic rocks of the Mongolian territory was studied by Dorjnamjaa et al. [2]. So, this paper provides for the stratigraphy and correlation of key sections through the Archean-Proterozoic-Mesozoic-Cenozoic of various areas of Mongolia. In this paper, the author introduces the most important results indicating the key reference sections for the first time and put into a broad regional context. The characterization and geologic mapping of lithological units provided an essential basis for the lithostratigraphy, biostratigraphy and chemostratigraphy. Especially key biostratigraphic aspects are the phenomenon of faunal succession. The basic lithostratigraphic unit is the formations and groups which have been successful mapped. At present in Mongolia for Precambrian period (systems and series) 30 formations and groups, for Paleozoic—about 250 formations and groups, for Mesozoic—102 formations and groups, for Cenozoic—27 formations, members, and beds are distinguished. The auxiliary stratigraphic units are members, beds which should be mapped depending on great extent of detailed study. In the regional stratigraphical classification, there are two primary kinds of stratotypes [3]: a) unit stratotypes, which serve as the standard of definition for a stratigraphic unit, and b) boundary stratotypes, which serve as the standard of definition for a stratigraphic boundary. These aspects, in particular gradational boundaryas far as possible were examined for example for Archean-Paleoproterozoic (by geochronologic data), Ediacaran-Early Cambrian (by soft-bodied fossils, trace fossils and small shelly fossils), Ordovician-Silurian (by beyrichiidostracodes), Devonian-Carboniferous (by conodonds), Paleocene-Eocene (by mammal展开更多
石松类和蕨类植物在秦仁昌(1978)系统、《中国蕨类植物科属志》、《中国植物志》、Christenhusz维管植物线性排列系统中和"Flora of China"的科属组成、数量存在很大差异。秦仁昌(1978)系统收录63科223属,《中国蕨类植物科属...石松类和蕨类植物在秦仁昌(1978)系统、《中国蕨类植物科属志》、《中国植物志》、Christenhusz维管植物线性排列系统中和"Flora of China"的科属组成、数量存在很大差异。秦仁昌(1978)系统收录63科223属,《中国蕨类植物科属志》63科226属,《中国植物志》61科220属、Christenhusz线性排列系统38科163属和"Flora of China"38科177属。本文通过比较石松类和蕨类植物的几个主要分类系统中科属的变动情况,拟为新一代植物志(iFlora)中石松类和蕨类植物的编研提供依据。同时,还指出了几个主要的分类系统中关于中文名、拉丁名以及命名人的不一致和错误,为进一步研究提供检索和鉴定参考。展开更多
目的探讨乙肝肝硬化患者肠道菌群变化与肝功能Child-Pugh分级、内毒素(lipopolysaccharide,LPS)及血氨的相关性。方法选取2019年1月至2020年1月间,蚌埠医学院第一附属医院感染科收治的80例乙肝肝硬化患者(肝硬化组)、80例单纯乙肝患者(...目的探讨乙肝肝硬化患者肠道菌群变化与肝功能Child-Pugh分级、内毒素(lipopolysaccharide,LPS)及血氨的相关性。方法选取2019年1月至2020年1月间,蚌埠医学院第一附属医院感染科收治的80例乙肝肝硬化患者(肝硬化组)、80例单纯乙肝患者(乙肝组)及体检中心80例健康人群(对照组)为研究对象。比较三组肠道菌群变化、肠道菌群丰度和多样性、LPS和血氨的水平,采用Pearson/Spearman相关分析肠道菌群丰度和多样性与肝功能Child-Pugh分级、LPS及血氨之间的相关性,采用受试者工作特征曲线(Receiver operating characteristic,ROC)下面积(Area under the curve,AUC)分析肠道菌群丰度和多样性、LPS、血氨诊断肝性脑病(Hepatic encephalopathy,HE)的效能。结果乙肝组、对照组拟杆菌门、厚壁菌门是肠道菌群的绝对优势菌,在肠道菌群中占比之和>80%,肝硬化组拟杆菌门、厚壁菌门占比低于乙肝组和对照组(P<0.05);变形菌门、梭杆菌门占比:肝硬化组>乙肝组>对照组(P<0.05);Chao指数、LPS:肝硬化组<乙肝组<对照组,Shannon指数、血氨:肝硬化组<乙肝组、对照组(P<0.05);Chao指数、Shannon指数与Child-Pugh分级、LPS、血氨呈负相关(P<0.05);HE患者Chao指数、Shannon指数低于无HE患者,LPS、血氨高于无HE患者(P<0.05);诊断HE的AUC:各指标联合为0.891,血氨为0.825,LPS为0.801,Shannon指数为0.794,Chao指数为0.739(P<0.05)。结论乙肝肝硬化肠道菌群异常与肝功能Child-Pugh分级、LPS和血氨有关,肠道菌群可能参与了肝功能恶化、内毒素血症以及HE并发症的发生与病情进展,肠道菌群Chao指数、Shannon指数有助于HE的诊断,调节肠道菌群有望成为乙肝肝硬化患者治疗方案中的一部分。展开更多
文摘斑子麻黄(Ephedra rhytidosperma)群落是贺兰山山麓特有荒漠植物群落。该研究于2019年调查了16个斑子麻黄典型群落,分析了物种组成的区系特征,运用TWINSPAN软件对16个斑子麻黄群落进行了分类。结果表明:1)斑子麻黄群落物种组成以禾本科、菊科、豆科和蒺藜科植物为主,隶属13科24属27种。2)斑子麻黄荒漠群落生活型以多年生草本(44.44%)和灌木(29.63%)为主;区系以古地中海成分(44.44%)和东亚成分(33.33%)为主;水分生态类型以旱生(40.74%)和强旱生(37.04%)为主。3)根据生活型和优势度,斑子麻黄群落可分为斑子麻黄-半灌木荒漠(Ephedra rhytidosperma-Semi-Shrub Desert)和斑子麻黄-草本荒漠(Ephedra rhytidosperma-Herb Desert) 2个群丛组,进一步划分为3个群丛:斑子麻黄-刺旋花-兴安胡枝子半灌木与草本荒漠(Ephedra rhytidosperma-Convolvulus tragacanthoides-Lespedeza davurica Semi-Shrub and Herb Desert)、斑子麻黄-刺旋花-中亚细柄茅半灌木与草本荒漠(Ephedra rhytidosperma-Convolvulus tragacanthoides-Ptilagrostis pelliotii Semi-Shrub and Herb Desert)和斑子麻黄-中亚细柄茅半灌木与草本荒漠(Ephedra rhytidosperma-Ptilagrostis pelliotii Semi-Shrub and Herb Desert)。
文摘This paper concerns deals with the Mongolian regional stratigraphic classification of sedimentary, sedimentary-volcanogenic sediments, and metamorphic complex spread over the territory of Mongolia according to the new International Chronostratigraphic Chart [1]. The regional stratigraphy of Precambrian-Cenozoic rocks of the Mongolian territory was studied by Dorjnamjaa et al. [2]. So, this paper provides for the stratigraphy and correlation of key sections through the Archean-Proterozoic-Mesozoic-Cenozoic of various areas of Mongolia. In this paper, the author introduces the most important results indicating the key reference sections for the first time and put into a broad regional context. The characterization and geologic mapping of lithological units provided an essential basis for the lithostratigraphy, biostratigraphy and chemostratigraphy. Especially key biostratigraphic aspects are the phenomenon of faunal succession. The basic lithostratigraphic unit is the formations and groups which have been successful mapped. At present in Mongolia for Precambrian period (systems and series) 30 formations and groups, for Paleozoic—about 250 formations and groups, for Mesozoic—102 formations and groups, for Cenozoic—27 formations, members, and beds are distinguished. The auxiliary stratigraphic units are members, beds which should be mapped depending on great extent of detailed study. In the regional stratigraphical classification, there are two primary kinds of stratotypes [3]: a) unit stratotypes, which serve as the standard of definition for a stratigraphic unit, and b) boundary stratotypes, which serve as the standard of definition for a stratigraphic boundary. These aspects, in particular gradational boundaryas far as possible were examined for example for Archean-Paleoproterozoic (by geochronologic data), Ediacaran-Early Cambrian (by soft-bodied fossils, trace fossils and small shelly fossils), Ordovician-Silurian (by beyrichiidostracodes), Devonian-Carboniferous (by conodonds), Paleocene-Eocene (by mammal
文摘石松类和蕨类植物在秦仁昌(1978)系统、《中国蕨类植物科属志》、《中国植物志》、Christenhusz维管植物线性排列系统中和"Flora of China"的科属组成、数量存在很大差异。秦仁昌(1978)系统收录63科223属,《中国蕨类植物科属志》63科226属,《中国植物志》61科220属、Christenhusz线性排列系统38科163属和"Flora of China"38科177属。本文通过比较石松类和蕨类植物的几个主要分类系统中科属的变动情况,拟为新一代植物志(iFlora)中石松类和蕨类植物的编研提供依据。同时,还指出了几个主要的分类系统中关于中文名、拉丁名以及命名人的不一致和错误,为进一步研究提供检索和鉴定参考。
文摘目的探讨乙肝肝硬化患者肠道菌群变化与肝功能Child-Pugh分级、内毒素(lipopolysaccharide,LPS)及血氨的相关性。方法选取2019年1月至2020年1月间,蚌埠医学院第一附属医院感染科收治的80例乙肝肝硬化患者(肝硬化组)、80例单纯乙肝患者(乙肝组)及体检中心80例健康人群(对照组)为研究对象。比较三组肠道菌群变化、肠道菌群丰度和多样性、LPS和血氨的水平,采用Pearson/Spearman相关分析肠道菌群丰度和多样性与肝功能Child-Pugh分级、LPS及血氨之间的相关性,采用受试者工作特征曲线(Receiver operating characteristic,ROC)下面积(Area under the curve,AUC)分析肠道菌群丰度和多样性、LPS、血氨诊断肝性脑病(Hepatic encephalopathy,HE)的效能。结果乙肝组、对照组拟杆菌门、厚壁菌门是肠道菌群的绝对优势菌,在肠道菌群中占比之和>80%,肝硬化组拟杆菌门、厚壁菌门占比低于乙肝组和对照组(P<0.05);变形菌门、梭杆菌门占比:肝硬化组>乙肝组>对照组(P<0.05);Chao指数、LPS:肝硬化组<乙肝组<对照组,Shannon指数、血氨:肝硬化组<乙肝组、对照组(P<0.05);Chao指数、Shannon指数与Child-Pugh分级、LPS、血氨呈负相关(P<0.05);HE患者Chao指数、Shannon指数低于无HE患者,LPS、血氨高于无HE患者(P<0.05);诊断HE的AUC:各指标联合为0.891,血氨为0.825,LPS为0.801,Shannon指数为0.794,Chao指数为0.739(P<0.05)。结论乙肝肝硬化肠道菌群异常与肝功能Child-Pugh分级、LPS和血氨有关,肠道菌群可能参与了肝功能恶化、内毒素血症以及HE并发症的发生与病情进展,肠道菌群Chao指数、Shannon指数有助于HE的诊断,调节肠道菌群有望成为乙肝肝硬化患者治疗方案中的一部分。
