The early Silurian Chongqing Lagerstätte(middle Telychian)yields exceptionally preserved articulated jawless and jawed fishes.Here,we describe a new eugaleaspiform(Galeaspida,jawless stem-Gnathostomata),Miaojiaas...The early Silurian Chongqing Lagerstätte(middle Telychian)yields exceptionally preserved articulated jawless and jawed fishes.Here,we describe a new eugaleaspiform(Galeaspida,jawless stem-Gnathostomata),Miaojiaaspis dichotomus gen.et sp.nov.,from the Chongqing Lagerstätte in Xiushan,Chongqing,China.The new form resembles Tujiaaspis vividus in the short medial dorsal canal,and the presence of the branching ends of the lateral transverse canal.They differ in that T.vividus has highly developed subordinate branches of the sensory canals that form a reticulate sensory canal system,and the median dorsal opening is more elongated.Our phylogenetic analysis recovers M.dichotomus and T.vividus as a monophyletic clade(Tujiaaspidae fam.nov.),which is supported by two synapomorphies:the short medial dorsal canal,and the branching ends of the lateral transverse canal.Tujiaaspidae forms a trichotomy with Shuyuidae and a clade comprising Anjiaspis,Sinogaleaspidae,Yongdongaspidae,and the‘eugaleaspid cluster’.The sensory canal patterns in galeaspids are compared to show the transformation sequence of the sensory canal system in Eugaleaspiformes.展开更多
Many karst geodes have been found in the pure Iimestone on the top Maokou formation (Permian) in the axial part of anticlines and lower part hydrological networks in Chongqing region. It is sometimes a reservoir natur...Many karst geodes have been found in the pure Iimestone on the top Maokou formation (Permian) in the axial part of anticlines and lower part hydrological networks in Chongqing region. It is sometimes a reservoir natural gas. Calcite megacryst decorates the wall of the geodes which believed to he formed in Tertiary.展开更多
19 kinds of organochlorine pesticides(OCPs)in groundwater surface sediments of Chongqing typical karst areas were analyzed by GC-ECD.The total concentration range of OCPs was 4.73-286.03 ng/g,the concentration range o...19 kinds of organochlorine pesticides(OCPs)in groundwater surface sediments of Chongqing typical karst areas were analyzed by GC-ECD.The total concentration range of OCPs was 4.73-286.03 ng/g,the concentration range of DDTs was 0.35-181.78 ng/g and the concentration range of HCHs was nd-23.53 ng/g.As compared with those of other rivers domestic and abroad,the organchlorine pesticides in sediments of Chongqing typical karst areas is in the high level which indicates that the underground river in Chongqing typical karst areas has been highly polluted.展开更多
In the twentieth century,the development of Chongqing Municipality was closely related to the development of China as a whole.Under the background of China’s rapid economic development,the construction of large cultu...In the twentieth century,the development of Chongqing Municipality was closely related to the development of China as a whole.Under the background of China’s rapid economic development,the construction of large cultural buildings is often aimed at stimulating economic growth,improving city image and enriching urban culture.Located in the southwest of China,Chongqing Municipality has gradually transformed from an industrial city to an exciting metropolis after a century of development and transformation.Taking Chongqing Grand Theatre and Chongqing Guotai Arts Center as examples,this study explores the interaction between urban development and cultural image enhancement in Chongqing Municipality.展开更多
Li Li(李莉)Prof. Li obtained her MSc and Ph.D. degrees in 2004and 2010 from Chongqing University. After graduating,she joined the New Energy Material Chemistry and Chemical Engineering Group led by professor Zidong We...Li Li(李莉)Prof. Li obtained her MSc and Ph.D. degrees in 2004and 2010 from Chongqing University. After graduating,she joined the New Energy Material Chemistry and Chemical Engineering Group led by professor Zidong Wei at Chongqing university.展开更多
文摘The early Silurian Chongqing Lagerstätte(middle Telychian)yields exceptionally preserved articulated jawless and jawed fishes.Here,we describe a new eugaleaspiform(Galeaspida,jawless stem-Gnathostomata),Miaojiaaspis dichotomus gen.et sp.nov.,from the Chongqing Lagerstätte in Xiushan,Chongqing,China.The new form resembles Tujiaaspis vividus in the short medial dorsal canal,and the presence of the branching ends of the lateral transverse canal.They differ in that T.vividus has highly developed subordinate branches of the sensory canals that form a reticulate sensory canal system,and the median dorsal opening is more elongated.Our phylogenetic analysis recovers M.dichotomus and T.vividus as a monophyletic clade(Tujiaaspidae fam.nov.),which is supported by two synapomorphies:the short medial dorsal canal,and the branching ends of the lateral transverse canal.Tujiaaspidae forms a trichotomy with Shuyuidae and a clade comprising Anjiaspis,Sinogaleaspidae,Yongdongaspidae,and the‘eugaleaspid cluster’.The sensory canal patterns in galeaspids are compared to show the transformation sequence of the sensory canal system in Eugaleaspiformes.
文摘Many karst geodes have been found in the pure Iimestone on the top Maokou formation (Permian) in the axial part of anticlines and lower part hydrological networks in Chongqing region. It is sometimes a reservoir natural gas. Calcite megacryst decorates the wall of the geodes which believed to he formed in Tertiary.
文摘19 kinds of organochlorine pesticides(OCPs)in groundwater surface sediments of Chongqing typical karst areas were analyzed by GC-ECD.The total concentration range of OCPs was 4.73-286.03 ng/g,the concentration range of DDTs was 0.35-181.78 ng/g and the concentration range of HCHs was nd-23.53 ng/g.As compared with those of other rivers domestic and abroad,the organchlorine pesticides in sediments of Chongqing typical karst areas is in the high level which indicates that the underground river in Chongqing typical karst areas has been highly polluted.
文摘In the twentieth century,the development of Chongqing Municipality was closely related to the development of China as a whole.Under the background of China’s rapid economic development,the construction of large cultural buildings is often aimed at stimulating economic growth,improving city image and enriching urban culture.Located in the southwest of China,Chongqing Municipality has gradually transformed from an industrial city to an exciting metropolis after a century of development and transformation.Taking Chongqing Grand Theatre and Chongqing Guotai Arts Center as examples,this study explores the interaction between urban development and cultural image enhancement in Chongqing Municipality.
文摘Li Li(李莉)Prof. Li obtained her MSc and Ph.D. degrees in 2004and 2010 from Chongqing University. After graduating,she joined the New Energy Material Chemistry and Chemical Engineering Group led by professor Zidong Wei at Chongqing university.
