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Cambrian Fossil Embryos from Western Hunan,South China

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 429-439页

作者： dong xiping Department of Geology Peking University Beijing 100871 State Key Laboratory of Paleobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjin 210008 China

The exquisitely preserved fossil embryos of Markuelia recovered from the limestones of the Middle Cambrian Haoqiao Formation and Upper Cambrian Bitiao formation in western Hunan, South China are described and illustrated in detail for the first time. A new species Markuelia elegans sp. nov. is established based mainly on embryos from the Upper Cambrian. A few of animal＇s resting eggs, which are comparable with those of the Ediacaran Doushantuo Formation, have been also found in the Upper Cambrian of western Hunan. The membrane of one egg from the uppermost Cambrian has been replaced by pyrite and the overgrowth of the pyrite crystals exhibits a unique inorganic pattern termed herein ＇Pseudoembryo＇. The taphonomic setting in deeper water with possible strong reducing conditions promoted the excellent preservation for the Markuelia specimens. The study of Markuelia provides not only constraint on the anatomy, affinity, embryonic development and phylogenetic significance of this wormlike animal and but also opens a new window onto the evolution and development of the earliest animals.

关键词： Markuelia fossil embryos resting eggs pseudoembryo taxonomy taphonomy Cambrian,Hunan China

Vestrogothia spinata(Phosphatocopina,Crustacea),Fossils of Orsten-type Preservation from the Upper Cambrian of Western Hunan,South China

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Acta Geologica Sinica(English Edition) 2009年第3期83卷 471-478页

作者： LIU Zheng dong xiping Department of Geology Peking University Beijing 100871 China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China

Fossils of Orsten-type preservation represented by the crustacean Skaracarida and Phosphatocopida were found in western Hunan, South China in 2005, including the important phosphatocopid species Vestrogothia spinata based on exquisitely preserved soft-bodied specimens that allow the first growth stage to be reestablished. The taxonomy of Vestrogothia spinata is revised employing the character of a two-divided limb stem of the mandible. A new foundation for the phylogeny of the Phosphatocopina using mandible characters related to crustacean appendages is postulated. Vestrogothia spinata has only previously been found from Sweden.

关键词： Vestrogothia spinata Phosphatocopina Crustacea Orsten-type fossil taxonomy ontogeny,Upper Cambrian Hunan South China

A Potential Candidate For the Middle-Upper Cambrian Boundary Stratotype——An Introduction to the Paibi Section in Huayuan,Hunan

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Acta Geologica Sinica(English Edition) 1990年第3期64卷 309-327,344-346+348页

作者： dong xiping Department of Geology, Peking University, Beijing Department of Geology Peking University Beijing

The Middle-Upper Cambrian boundary is one of the current stratigraphical problems which remain openin the geological world, since there have been no universally acknowledged delimiting standard and *** on the instruction of Profs. Lu Yanhao and An Taixiang the author studied in details the Paibi Section,which is well exposed as a continuous sequence at an easily accessible locality. The Middle-Upper Cambrianboundary strata are composed of biocalcimicrosparite, indicating the sedimentary environment of anunderwater upheaval on the gentle slope along the frontal margin of the Yangtze carbonate platform. For the upper Middle and lower Upper Cambrian agnostid trilobite zones and conodont zones are erected,and a more accurate correlation between the trilobite and conodont sequences is established. Based on these,the Middle-Upper Cambrian boundary is drawn more reasonably and precisely than what was done before. Inshort, the section studied is superior to other known sections of Middle-Upper Cambrian. and it will probablybe an ideal candidate for the Middle-Upper Cambrian boundary stratotype.

关键词： In An Introduction to the Paibi Section in Huayuan,Hunan A Potential Candidate For the Middle-Upper Cambrian Boundary Stratotype

Internal Structure of Cambrian Fossil Embryo Markuelia Revealed in the Light of Synchrotron Radiation X-ray Tomographic Microscopy

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Acta Geologica Sinica(English Edition) 2011年第1期85卷 81-90页

作者： CHENG Gong PENG Fan DUAN Baichuan dong xiping School of Earth and Space Sciences Peking University Beijing 100871 China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China

In the light of Synchrotron Radiation X-ray Tomographic Microscopy （SRXTM）, the internal structure of Markuelia hunanensis is revealed. In one example, vitrification and peeling show the annuli hidden under the chorion. Sectioning and 3-D reconstruction display an intact digestive tract from the inverted introvert to the terminal anus. The inverted introvert forms a rugby cavum. The following digestive tract is rope-like coiling, parallel to the body axis, about 650 μm in length, and uniform in diameter （-80 μm）. An exquisitely preserved pipe-like structure is hidden in the middle of the rope-like structure, diameter 20--40 lam, with a length of -120 μm. We interpret this pipe-like structure as the possible epidermis of the gut and its surroundings as the possible residue of musculature, similar to that in Priapulans. The two symmetrical rod-shape structures connecting the body wall and digestive tract are interpreted as the possible retractor muscles. After comparing the well preserved Left-form and Right-form Body of Markuelia, we suggest that they may represent a dimorphism. Counted directly, one sample of Markuelia hunanensis possesses 62 annulations and the other 68.

关键词： Markuelia Synchrotron Radiation X-ray Tomographic Microscopy (SRXTM),dimorphism

拉贝洛尔联合低分子肝素对早发型重度子痫前期孕妇凝血功能及血压的影响

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当代医学 2024年第11期30卷 42-46页

作者：董熙萍苏小莲王慧济南市第一人民医院妇产科山东济南250011

目的探究拉贝洛尔联合低分子肝素对早发型重度子痫前期孕妇凝血功能及血压影响。方法选取2021年1月至2022年7月济南市第一人民医院收治的80例早发型重度子痫前期患者作为研究对象,随机分为A组与B组,每组40例。A组给予拉贝洛尔治疗,B组... 详细信息

目的探究拉贝洛尔联合低分子肝素对早发型重度子痫前期孕妇凝血功能及血压影响。方法选取2021年1月至2022年7月济南市第一人民医院收治的80例早发型重度子痫前期患者作为研究对象,随机分为A组与B组,每组40例。A组给予拉贝洛尔治疗,B组给予拉贝洛尔联合低分子肝素治疗。比较两组治疗前后凝血功能指标、血压、血脂水平、母婴结局、新生儿Apgar评分及不良反应发生情况。结果治疗后,B组凝血酶原时间(PT)、凝血酶时间(TT)、活化部分凝血活酶时间(APTT)均长于A组,新生儿5、10 min Apgar评分均高于A组,纤维蛋白原(FIB)、收缩压(SBP)、舒张压(DBP)、甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)水平及不良新生儿结局、不良妊娠结局发生率均低于A组,差异有统计学意义(P<0.05)。两组不良反应发生率比较差异无统计学意义。结论拉贝洛尔联合低分子肝素治疗早发型重度子痫前期,可改善患者凝血功能、血脂及血压水平,改善母婴结局,且安全性较高。

关键词：早发型重度子痫前期拉贝洛尔低分子肝素凝血功能血压

Skara hunanensis a new species of Skaracarida (Crustacea) from Upper Cambrian (Furongian) of Hunan,south China

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Progress in Natural Science:Materials International 2007年第8期17卷 934-942页

作者： Liu Jie dong xiping~(**) (School of Earth and Space Science,Peking University,Beijing 100871,China) [a]School of Earth and Space Science Peking University Beijing China

The fossils of Orsten-type preservation are as famous as Chengjiang Fauna in the world,but it was not until 2005 that the Orsten-type fossils represented by Skaraearida and Phosphatocopida were first reported to be found in western Hunan,South China. Here,we report the systematic paleontology of all the exquisitely preserved specimens belonging to *** were found at a same horizon of Upper Cambrian (Furongian) in Wangcun section,western Hunan,south China,assigned to a new species Skara huna- nensis *** hunanensis is characterized by small,soft-integumented,marine forms with slender,annulate body;labrum large and ventrocaudally directed;uniramous antennulae;biramous antennae and mandibulae;maxillas and maxillipeds of the same shape;all postantennular limbs join a short cephalic filter *** body has two tagmata:a cephalon with five pairs of well developed ap- pendages and a trunk composed of 11 ring-shaped conical segments.

关键词： Skara hunanensis Skaracarida Crustacea Upper Cambrian Furongian Hunan

Histological observation of some primitive euconodonts of Late Cambrian from Liaoning

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Progress in Natural Science:Materials International 2005年第12期15卷 1084-1088页

作者： GUO Wei,dong xiping,ZENG Xiaochun and ZHAO Le Department of Geology,College of Environmental Science,Peking University,Beijing 100871,China Department of Geology College of Environmental Science Peking University Beijing 100871 China. College of Environmental Science Peking University Beijing 100871 China

The histology of some euconodonts of Late Cambrian from Benxi and Fuxian County,Liaoning Province is studied by the oil-immersion *** histological characteristics of six primitive species of euconodonts - Proconodontus muelleri,Proconodontus tenuiserratus,Granatodontus ani,Rotundoconus tricarinatus,Teridontus nakamurai and Cordylodus proavus are described in *** dentine and atubular (parallel- and wavy-lamellar) dentine are found in the basal bodies of the primitive euconodonts Proconodontus tenuiserratus and Proconodontus muelleri,*** tubular dentine and spherulitic dentine are also recognized from the basal bodies of Granatodontus ani and Rotundoconus *** the histological characteristics of the studied six species of euconodonts belonging to Proconodontus lineage and Teridontus lineage Sensu Miller (Univ Kansas Paleontol Contr,1980,99: 1-39) seems to be almost the same,euconodonts are proposed as possibly monophyletic herein.

关键词： histology primitive euconodonts Late Cambrian Liaoning

On the evolution and histology of some Cambrian protoconodonts, paraconodonts and primitive euconodonts

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Science China Earth Sciences 2004年第7期47卷 577-584页

作者： dong xiping Department of Geology, Peking University, Beijing 100871, China Laboratory of Palaeobiology & Stratigraphy, Nanjing Institute of Ge-ology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China 1. Department of Geology Peking University 100871 Beijing China 2. Laboratory of Palaeobiology & Stratigraphy Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences 210008 Nanjing China

Previous reports on the morphological evolution of protoconodonts and paraconodonts are reviewed. The evolutionary trends exhibited by species of the protoconodont genus Gapparodus and the paraconodont genus Westergaadodina are discussed. Based on the present study on histology, genus Paibiconus is protoconodont, while genus Yongshunella is paraconodont (fig. 1 (a)). However, the nature of Huayuanodontus has not been fully understood so far. Recently, the transitional form New Gen. Sensu Miller, 1980 of late Late Cambrian has been found in Hunan Province, South China. It is considered as the Sister-Group of Proconodontus. Moreover, another kind of transitional form of middle Late Cambrian and late Late Cambrian between Prooneotodus notundatus and Pnoconodontus, which looks like Prooneotodus notundatus in gross morphology, but has anterior and posterior costae, has also been found in Hunan, South China. This kind of transitional form is believed to be probably the real intermediate link between Prooneotodus rotundatus and Pnoconodontus, and Prooneotodus rotundatus is most probably the ancestor of Proconodontus. The two transitional forms noted above are all euconodonts by the study of their histology. Unlike the euconodonts of Post-Cambrian, the evolutionary relationships among the species of protoconodonts, paraconodonts and the primitive euconodonts could not be made clear without the histological study on them.

关键词： protoconodonts, paraconodonts, evolution, histology, Cambrian.

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论辽宋文学的互动特征

民族文学研究 2022年第6期40卷 15-22页

作者：董希平中国传媒大学人文学院

辽立国于草原,其文学先天具有游牧民族质朴爽朗的特色;宋承袭中原传统,其文学则底蕴深厚、发展全面,具有恢弘开阔的正统气象。辽与宋各凭藉其自身的优势,在长时间的对峙与交往中,以相互竞争为核心方式、以相互影响为基本态势、以相互欣... 详细信息

辽立国于草原,其文学先天具有游牧民族质朴爽朗的特色;宋承袭中原传统,其文学则底蕴深厚、发展全面,具有恢弘开阔的正统气象。辽与宋各凭藉其自身的优势,在长时间的对峙与交往中,以相互竞争为核心方式、以相互影响为基本态势、以相互欣赏为主流格调,实现了多层面的文化的交流,也形成了两大特色文学的互动特征。二者最终取长补短,在互动中完善自身并强化了自身特色。

关键词：辽宋文学文学互动相互竞争相互影响相互欣赏