湖北郧西范家坪早石炭世四射珊瑚

本文描述了贵阳西北郊探矿厂对面山坡上发现的早二叠世晚期茅口组双切尾虫亚科三叶虫的1新属——棘菲利普虫属(Acanthophillipsia),计4新种:Acanthophillipsia guiyangensis, A. abrota, A. abnormis和A.granurosa,丰富了我国二叠纪三叶虫动物群的资料,对研究二叠纪三叶虫的分类、演化和古生物地理分区都具有一定的意义。     

湖南奥陶系圆尾虫科(Cyclopygidae)三叶虫

圆尾虫类三虫是世界各地奥陶纪地层中极为常见的三叶虫之一.它始于早奥陶世早期,盛于中奥陶世.关于此类三叶虫的研究历史和现状,卢衍豪(1975)已作了详细的介绍.近年来,在我国,有关圆尾虫类三叶虫的报道不断增加,由原来的2属增加到8属,他们是: Cyclopyge Hawle et corda 1847, Xenocyclopyge Lu 1962, Psilacella Whittard     

贵州东南部早、中寒武世凯里组非三叶虫节肢动物

记述贵州台江县革东镇八郎村早,中寒武世凯里组中,上部非三叶虫节肢动物２号４种,其中３新种和１比较种。非三叶虫节肢动物在我国中寒武统尚属首次报道,它的发现提供了有关地质发展中上早期节肢动物发生和演化的新资料。     

陕西紫阳早奥陶世Alsataspididae科三叶虫新属

Alsataspididae科三叶虫仅包括Seieneceme Clark,1924及Falanaspis Tjernvik,1956两个属的几个种,分布在加拿大纽芬兰、魁北克、美国得克萨斯及瑞典等少数地槽区的早奥陶世早期地层,是一类比较少见的地槽型三叶虫。这一科三叶虫的特征是具有长的前轴刺及颊刺,头鞍作亚圆形,具有一对纵向头鞍沟,无眼叶,颈环窄而短,胸部和尾部分节较多等。目前,在我国大巴山加里东褶皱带下奥陶统发现的该科三叶虫是新属Caputrotundum Deng et Zhao (gen.nov.)的两个新种C.bashanense Deng et Zhao(gen. et sp. nov.)及C. ziyangensis Deng et     

特马豆克期三叶虫Dichelepyge lata Peng的个体发育

记述了产于湘西泸溪特马豆克期锅塘组的刺尾虫类三叶虫Ｄｉｃｈｅｌｅｐｙｇｅｌａｔａ的个体发育过程。其最显著的变化有头鞍形状和比例的改变，头鞍沟、颈沟与背沟的分离．鞍前箍（ｐａｒａｆｒｏｎｔａｌｂａｎｄ）的出现与消失．胸部肋区和轴部比例宽度的改变，尾部的形状和比例的变更，尾边缘的出现和肋沟深度的增加，以及后侧刺的位置逐渐前移。组成成虫期个体的前８个体节（６个胸节和前２个尾节）极有可能在分节０期（ｍｅａｓｐｉｄＤｅｇｒｅｅ０）便已形成。从分节３期（ｍｅｒａｓｐｉｄＤｅｇｒｅｅ３）起在带后侧刺的体节与轴后区（ｐｏｓｔａｘｉａｌｆｉｅｌｄ）之间又发育出一个新的体节。过渡期尾部（ｔｒａｎｓｉｔｏｒｙｐｙｇｉｄｉｕｍ）在分节０期或分节１期发育出后侧刺．在分节４期又同时长出３对侧刺，其中最后一对侧刺与后侧刺一道形成成年期尾部的尾刺。     

贵州剑河八郎寒武系“清虚洞组”中上部褶颊虫类三叶虫

贵州剑河八郎一带发育一套以灰岩为主的"清虚洞组",中上部的泥岩、灰岩中含有大量的三叶虫,其中褶颊虫类三叶虫共6属7种,包括2相似种:丹寨南皋盾甲虫Nangaops danzhaiensis,横宽八郎村虫Balangcunaspis transversus,南京幕府山虫(相似种)Mufushaniacf.nankingensis,优美小丹寨虫Eosoptychoparia(Danzhaina)lilia,大型小遇仙寺虫Yuehsienszella magna,高洞始褶颊虫Eoptychoparia gaodongensis,云南始褶颊虫(相似种)Eoptychopariacf.yunnanensis。这些褶颊虫类三叶虫以Nangaops及Eoptychoparia为主,Nangaops,Balangcunaspis,Mufushania及Eosoptychoparia(Danzhaina)均上延至凯里组,Eoptychoparia为典型清虚洞组的常见分子。"清虚洞组"中上部大量褶颊虫类三叶虫的发现,不仅完善了本区"清虚洞组"褶颊虫类三叶虫的组成面貌,而且为认识早期褶颊虫类的演化和研究寒武系都匀阶的生物地层提供了新的材料。     

论Kaotaia属

记述了Ｋａｏｔａｉａ属的１新种Ｋ,ｔｒａｎｓｖｅｒｓａ ｓｐ． ｎｏｖ．及其个体发育过程中的一些变异,并着重讨论了Ｋａｏｔａｉａ的分类位置,起源和演化趋向。此外,还描述了早寒武世晚期一个与Ｋａｏｔａｉａ有密切关系的新属－Ｅｏｋａｏｔａｉａ及其２新种。对于研究寒武纪褶颊虫类三叶虫的分类和演化具有一定的意义。     

西南地区志留-泥盆纪三叶虫的新属种及其地层意义

本文是西南地区志留纪三叶虫动物群研究的一部分。材料主要搜集于1972年。文章着重描述缨盾壳虫科、手尾虫科、斜视虫科、齿肋虫科、砑头虫科以及裂肋虫科的一些新属种,共计14个属,其中有4个新属。此外,还对这一三叶虫动物群出现的地质时代作一探讨。     

广西靖西晚寒武世无刺和温虫(Hewenia anacantha)新材料*

和温虫(Hewenia)自1977年建属30余年来鲜有报道。本文对陈贵英、韩乃仁等在2009年、2011年采自广西靖西的无刺和温虫(Hewenia anacantha)进行描述和统计分析,并将当前标本与之前周天梅和朱学剑描述的同属标本进行对比讨论。此批标本数量较大,保存较好,甚至有唇瓣保存。Hewenia anacantha是一以截锥形头鞍、新月形大眼叶、加宽的前边缘、狭长后侧翼、颊刺小或缺失为主要特征的后颊类小尾至异尾型三叶虫。     

Tamdaspis Lisogor的分类位置、异名及新种

1982年夏,笔者在检查湘西凤凰山江千公坪剖面时,采获一批晚寒武世三叶虫化石,其中包括本文记述的新种Tamdaspis brevilimbus sp. nov。Tamdaspis最初见于苏联哈萨克,为(1977)所建。其后相继在我国新疆(张太荣,1981)和安徽(仇洪安等,1983)发现。最近在哈萨克又找到一些新材料(Apollonov et al.,1984)。安徽的材料,经钱义元、仇洪安鉴定,认为是一新属,命名为Psiloyuepingia Qian et Qiu,1983。Tamdaspis是一个比较特征的刺尾虫类(ceratopygids)三叶虫(尽管尾部缺乏侧刺)。     

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     

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.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

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.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细