北祁连山地区石炭系—二叠系牙形刺序列(英文)

甘肃省北祁连山地区典型的石炭系—二叠系海陆过渡相沉积中牙形刺较为丰富。对该区三个剖面进行牙形刺的系统研究,鉴定牙形刺9属27种。识别出11个牙形刺带或组合带,从下至上依次为Gnathodus bilineatus bilineatus,G.bilineatus bollandensis,Idiognathoides sulcatus sulcatus,Id.sinuatus,Idiognathodus delicatusI.magnificus,I.podolskensis,Swadelina subexcelsus,Sw.makhlinae,Streptognathodus oppletus-S.elegantulus,S.elongatus和S.barskovi带或组合带。该牙形刺序列可与我国其他地区进行对比,为北祁连山地区提供了高精度的牙形刺生物地层格架。牙形刺的丰度受沉积相控制。     

贵州罗甸纳水上石炭统(宾夕法尼亚亚系)地层的再研究

本文详细描述了贵州罗甸纳水上石炭统(宾夕法尼亚亚系)剖面的生物地层和年代地层,其牙形刺序列自上而下可详细划分为：Streptognathodus isolatus, S. wabaunsensis, S. tenuialveus, S. firmus, Idiognathodus nashuiensis , Streptognathodus simulator, S. guizhouensis , S. gracilis-S, excelsus , S. cancellosus , S. clavatulus , S. nodocarinatus , Idiognathodus podolskensis , Mesogondolella clarki -Idiognathodus robustus , Diplognathodus ophanus-D, ellesmerensis, Idiognathoides ouachitensis, Streptognathodus expansus, Idiognathoides sulcatus parva, Idiognathodus primulus-Neognathodus bassleri, Idiognathodus primulus-Neognathodus symmetricus, Neognathodus symmetricus, Idiognathoides corrugatus-I, pacificus, I. sinuatus, I. sulcatus sulcatus, Declinognathodus noduli ferus 和 Gnathodus bilineatus bollandensis 等带。 Declinognathodus noduliferus 和 Streptognathodus isolatus 的首次出现分别代表上石炭统(宾夕法尼亚亚系)和二叠系的开始。根据牙形刺和有孔虫的序列,罗甸纳水剖面的上石炭统(宾夕法尼亚亚系)地层自下而上可划分为罗苏阶(Luosuan)、滑石板阶(Huashibanian)、达拉阶(Dalaan)和马平阶(Mapingian),并可与俄罗斯的巴什基尔阶(Bashkirian)、莫斯科阶(Moscovian)、卡西莫夫阶(Kasimovian)和格舍尔阶(Gzhelian),北美的莫罗阶(Morrowan)、阿托克阶(Atokan)、得梅因阶(Desmoinesian)、密苏里阶(Missourian)和弗吉尔阶(Virgilian)进行对比。另外,本文也详细讨论了剖面中的石炭系中间界线及石炭-二叠系界线。     

苏北滨海—宝应地区石炭系牙形刺

本文记述了滨海县新港滨Ⅱ-2孔和宝应县黄浦黄10孔石炭系牙形刺13属16种5亚种和3个未定种。它们自下而上可归属4个牙形刺带和1个亚带。下石炭统的Siphonodella levis-Polyg-nathus inornatus带(含 Siphonodella eurylobata-Polygnaths streeli亚带)和 Gnathodus girtyi带;上石炭统的 Idiognathoides sulcatus带和 Idiognathodus delicatus-I.sinuosus带。     

广西忻城里苗石炭纪牙形刺

广西忻城里苗剖面主要由深灰色含燧石结核灰岩组成,含有丰富的牙形刺,代表深承相沉积,本文命名为“里苗组”。里苗剖面石炭纪牙形刺由下而上可划分出四个带或组合带;(1)Pseudopolygnathus irianoulus pinnatus带;(2)Gnathodus svmiglabvr-Gnathodus typicus组合带;（3)Gnathodus bilineatus带和(4)Declinognathodus noduHferus nodutiferus-D．lateralis组合带。     

华南贵州罗甸纳水剖面宾夕法尼亚亚系各阶之界线

贵州罗甸纳水剖面是研究宾夕法尼亚亚系牙形刺和各阶界线的良好剖面。经详细研究,从石炭系中间界线至石炭-二叠系界线,一个新的牙形刺序列为Gnathodus bilineatus bollandensis（密西西比亚系顶部）,Declinog-nathodus noduliferus,Idiognathoidessulcatus sulcatus,Id.sinuatus,Id.corrugatus-Id.pacificus,Neognatho-dus symmetricus,Idiognathodus pri mulus-Neognathodus symmetricus,Idiognathodus pri mulus-Neognathodus bassleri,Idiognathoides sulcatus parva,Streptognathodus expansus,Idiognathoides ouachitensis,Diplognatho-dus coloradoensis,Di.ellesmerensis,Gondolella donbassica-Go.clarki,Idiognathodus podolskensis,Swadelina subexcelsa,Sw.makhlina-Sw.nodocarinata,Idiognathodus sagittalis,Streptognathodus cancellosus,St.graci-lis,St.guizhouensis,Idiognathodus si mulator,I.nashuiensis,Streptognathodus firmus,St.tenuialveus,St.wabaunsensis和St.isolatus（二叠系）等带。Declinognathodus noduliferus和Streptognathodus isolatus的首次出现分别代表宾夕法尼亚亚系和二叠系之底;Diplognathodus ellesmerensis,Idiognathodus sagittalis和I.si mula-tor的首现则可分别代表莫斯科阶（Moscovian）,卡西莫夫阶（Kasi movian）和格舍尔阶（Gzhelian）之底界。作者较为详细讨论了巴什基尔阶与莫斯科阶以及卡西莫夫阶与格舍尔阶之界线,并认为以Diplognathodus ellesmerensis的首现作为巴什基尔阶（Bashkirian）与莫斯科阶之界线是目前最合适的标志。Diplognathodus ellesmerensis是一易于识别、分布广泛及层位稳定的牙形刺种,其产出又十分接近巴什基尔阶与莫斯科阶的传统界线,因此是划分此界线的良好标志。作者拟推荐纳水剖面为莫斯科阶底界之候选层型剖面,这一界线详细的工作正在大量采样分析和深入研究中,成果将在以后陆续发表。     

华南贵州罗旬纳水剖面宾夕法尼亚亚系各阶之界线

贵州罗甸纳水剖面是研究宾夕法尼亚亚系牙形刺和各阶界线的良好剖面.经详细研究,从石炭系中间界线至石炭-二叠系界线,一个新的牙形刺序列为Gnathodus bilineatus bollandensis(密西西比亚系顶部),Declinog-nathodus noduliferus, Idiognathoides sulcatus sulcatus, Id. sinuatus, Id. corrugatus-Id. pacificus, Neognatho-dus symmetricus, Idiognathodus primulus-Neognathodus symmetricus, Idiognathodus primulus-Neognathodus bassleri, Idiognathoides sulcatus parva, Streptognathodus expansus, Idiognathoides ouachitensis, Diplognatho-dus coloradoensis, Di. ellesmerensis, Gondolella donbassica-Go, clarki, Idiognathodus podolskensis, Swadelina subexcelsa, Sw. makhlina-Sw, nodocarinata, Idiognathodus sagittalis, Streptognathodus cancellosus, St. graci-lis, St. guizhouensis, Idiognathodus simulator, I. nashuiensis, Streptognathodus firmus, St. tenuialveus, St. wabaunsensis和St. isolatus(二叠系)等带.Declinognathodus noduliferus和Streptognathodus isolatus的首次现分别代表宾夕法尼亚亚系和二叠系之底;Diplognathodus ellesmerensis, Idiognathodus sagittalis和J. simula-tor的首现则可分别代表莫斯科阶(Moscovian),卡西莫夫阶(Kasimovian)和格舍尔阶(Gzhelian)之底界.作者较为详细讨论了巴什基尔阶与莫斯科阶以及卡西莫夫阶与格舍尔阶之界线,并认为以Diplognathodus ellesmerensis的首现作为巴什基尔阶(Bashkirian)与莫斯科阶之界线足目前最合适的标志.Diplognathodus ellesmerensis是一易于识别、分布广泛及层位稳定的牙形刺种,其产出又十分接近巴什基尔阶与莫斯科阶的传统界线,因此是划分此界线的良好标志.作者拟推荐纳水剖面为莫斯科阶底界之候选层型剖面,这一界线详细的工作正在大量采样分析和深入研究中,成果将在以后陆续发表.     

云南大理洱海砂子箐组的时代及谢尔普霍夫阶地层的发现

云南大理洱海之东的砂子箐组产有牙形刺Scaliognathus anchoralis,Gnathodus typicus,Gnathodus cf.girtyi等化石,清楚地表明砂子箐组的地质时代为杜内期.在双廊镇大建旁村环海公路边灰岩中发现牙形刺Lochriea ziegleri,Gnathodus cantabricus,Gnathodus bilineatus remus,Gnathodus bilineatus romulus,充分证明海东地区谢尔普霍夫阶地层的存在.     

黔南石炭-二叠系界线牙形刺序列的再研究

本文详细描述了华南贵州罗甸纳水和紫云羊场石炭-二叠系的界线牙形刺序列,并自上而下可划分为：Streptognathodus barskovi,S.constrictus,S.isolatus,S.wabaunsensis.S.tenuialueus和S.firmus带,而Strep-tognathodus isolatus的首现则代表了二叠系的底界,本文讨论了世界各地石炭-二叠系界线牙形刺序列的对比。     

华南上石炭统莫斯科阶-卡西莫夫阶界线附近的牙形刺

作者详细描述了华南上石炭统莫斯科阶-卡西莫夫阶界线附近的牙形刺序列,由上而下可划分为:Streptog-nathodus gracilis,St.cancellosus,Idiognathodus sagittalis,Swadelina makhlinae-Sw.nodocarinata,Sw.subexcelsa和Idiognathodus podolskensis带,并对这些牙形刺带进行了国际对比。同时认为,以Idiognathodus sagittalis的首次出现为卡西莫夫阶的底界是最好的选择。另外,文中的Idiognathodus sagittalis,Swadelina makhlinae和Sw.subexcelsa都是我国的首次报道。     

湖南慈利索溪峪二叠系牙形刺

本文是湘西二叠纪牙形刺的首次报道。本区二叠系地层连续,化石丰富,属碳酸岩浅海台地相沉积。本文描述了牙形刺20种,1新种。本区二叠系自下而上可划分出六个牙形刺带或组合带:Neogondolella sorrata带,N.aserrata-N,postserrata组合带,N.urilcaxi带,N.billeri带,N.leveni带和N.changxingensis-A.deftecta组合带。     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Comparative morphology of the carpel in the Liliaceae: Hewardieae, Petrosavieae, and Tricyrteae

The young pistils in the melanthioid tribes, Hewardieae, Petrosavieae and Tricyrteae, are uniformly tricarpellate and syncarpous. They lack raphide idioblasts. All are multiovulate, with bitegmic ovules. The Petrosavieae are marked by the presence of septal glands and incomplete syncarpy. Tepals and stamens adhere to the ovary in the Hewardieae and the Petrosavieae but not in the Tricyrteae. Two vascular bundles occur in the stamens of the Hewartlieae and Tricyrtis latifolia. Ventral bundles in the upper part of the ovary of the Hewardieae are continuous with compound septal bundles and placental bundles in the lower part. Putative ventral bundles occur in the alternate position in the Tricyrteae and putative placental bundles in the opposite. position in the Petrosavieae. The dichtomously branched stigma in each carpel of the Tricyrteae is supplied by a bifurcated dorsal bundle.     

鸡传染性法氏囊病病毒研究进展

传染性法氏囊病(Infection bursal disease, IBD)是由鸡传染性法氏囊病毒(Infectious bursal disease virus, IBDV)引起的鸡和火鸡的一种高度接触性传染病,给世界各国的禽养殖业带来了巨大损失.自IBDV发现至今新的变异株不断出现,分子结构的改变导致病毒致病力的改变及宿主对疫苗应答的改变,使得传统的疫苗已不能控制其流行,因此各国学者对其基因组结构和功能进行了广泛深入的研究,并积极研制新型有效的疫苗以达到防治的目的.     

Development of a Novel Reverse Transcription Loop-Mediated Isothermal Amplification Method for Rapid Detection of SARS-CoV-2

In conclusion, the novel visual RT-LAMP assay is a simple, rapid, and sensitive approach for detection of SARS-CoV-2, and it is ready for application in primary care and community hospitals or health care centers, and even patients' own houses in response to the current SARS-CoV-2 epidemic because the assay does not require sophisticated equipment and skilled personnel. Furthermore, it is also ready to be used in fields for screening samples from wild animals and environments to facilitate the identification of potential intermediate hosts that mediate the cross-species transmission of SARS-CoV-2 from bats to humans.     

Perinatal Vertical Transmission of Chikungunya Virus in Ruili,a Town on the Border between China and Myanmar

正Dear Editor,Chikungunya virus (CHIKV), an arbovirus in the family of Togaviridae, genus Alphavirus, is transmitted by the A.aegyptii or A. albopictus mosquito, and causes disease in humans characterized by fever, rash, and arthralgia (Silva and Dermody 2017; Suhrbier 2019). It was first reported in 1953 in Tanzania, and caused only a few outbreaks and sporadic cases in Africa and Asia in last century. However, in the epidemic in 2004, CHIKV acquired mutations that conferred enhanced transmission by the A. albopictus mosquito(Schuffenecker et al. 2006). Since then, it has successively caused outbreaks in Africa, the Indian Ocean, South East Asia, the South America, and Europe (Zeller et al. 2016).