海南岛白沙县金波早石炭世早期腕足动物群

海南岛地区的石炭纪腕足动物,以往缺乏研究和描述。产于白沙县金波的早石炭世腕足动物化石群,经鉴定共有22属,30种和未定种,其中4新种;这是该岛迄今发现的最丰富、较可靠的早石炭世杜内期腕足动物群。在属种组合上,这个动物群以石燕贝目分子为优势组分;在区系特征上,它与扬子区系有一定差别,而与北方生物地理区系有较多的相似性和可比性;这个动物群的发现,为进一步探讨和解释海南岛早石炭世构造古地理格局及其演化提供了重要线索。文中还详细讨论了相关地层名称的取舍等问题。     

四川巴塘、义敦的晚古生代四射珊瑚

本文记述巴塘、义敦早石炭世最晚期的Hiroshimaphyllum 动物群和早二叠世晚期的Ira-nophyllum-Ipciphyllum 动物群。这两个动物群的性质不同于我国华南和西南地区同期地层中所见者。文内探讨了形成这两个动物地理区的主要因素。本文共描述早石炭世最晚期的珊瑚5属7种,其中2新属、4新种、2未定种;早二叠世晚期4属4种,其中2新种、1未定种。     

贵州威宁石炭纪苔藓虫

本文记述苔藓虫共13属34种,除早二叠世两种外,都属石炭纪。其中早石炭世22种,包括7新种;中石炭世9种;晚石炭世3种,包括1新种。根据共生化石的特点,讨论了这些苔藓虫化石的地层意义。     

新疆西准噶尔地区泥盆-石炭系界线附近的腕足动物(长身贝类、无窗贝类及穿孔贝类)

新疆西准噶尔沙尔布尔提山地区泥盆系—下石炭统发育良好,各门类海相生物化石众多,尤以腕足类化石最为丰富。根据对采自该地区3个剖面(布龙果尔剖面、和布克河剖面、俄姆哈剖面)上腕足类的详细研究,系统描述长身贝类4属4种,无窗贝类2属3种,穿孔贝类2属2种,穿孔贝类(Dielasma cf.D.? utah(Hall and Whitfield),Cranaena cf. hannibalensis Moore)为该地区首次报道。除无窗贝类Cleiothyridina cf. kusbassica Besnossova在俄姆哈剖面可延续进入下石炭统之外,其余属种皆产自上泥盆统。上述腕足动物属于Syringothy-ris-Spirifer动物群的重要分子,时代为晚泥盆世—早石炭世,大致对应于牙形石中praesulcata带至sandbergi带(法门最晚期—早石炭世)。上述腕足动物群在组成上与北美、乌拉尔地区及库兹涅茨盆地的化石组合较为相似。     

云南保山地区二叠纪Shanita有孔虫动物群

系统研究了云南保山市卧牛寺附近大凹子组“破灰岩”中的Shanita有孔虫动物群,鉴定出其中特征分子Shanita和Hemigordiopsis8种(包括2新种,不含未定种和比较种),其他非有孔虫10属。研究结果表明,保山地区Shanita动物群的特征属和整体构成与缅甸、泰国和我国西藏等地的Shanita动物群相似,时代为茅口期晚期(冷坞期)至吴家坪期早期。但是,总体属级分异度较低,个别地方性种的出现及共生类的缺失,又使得保山地区的Shanita动物群具有一定的地域色彩。     

福建宁化早二叠世早期的小有孔虫动物群

本文报道的福建宁化湖村早二叠世时期与StaffellaTing共生的小有孔虫动物群,在福建地区还属首次发现。该动物群计有9属20种,称为Globivalvulina-Nodosaria组合。这一小有孔虫动物群的发现,不但为福建地区栖霞组底部补充了新的化石门类,且为石炭系二叠系的划分提供了新的依据。     

贵州威宁石炭纪的腹足类及古生态

描术贵州西部晚石炭世威宁组的腹足类７属９种（其中２新种）,早石炭世草海组鸭子塘段的腹足类６属６种（其中１新种）。参照黄渤海海域内现生腹足类的生态习性,初步推断鸭子段为早石炭世浅海陆棚沉积。     

НЕСКОЛЬКО НОВЫХ ИСКОПАЕМЫХ ДРЕВНЕЙШИХ ВОДОРОСЛЕЙ ИЗ ДОКЕМБРИЙСКИХ ОТЛОЖЕНИЙ КИТАЯ И ИХ СТРАТИΓРАФИЧЕСКОЕ ЗНАЧЕНИЕ

早石炭世的层孔虫是比较少的,在中国还没有正式描述过。虽然满苏(Mansuy,1911—1916)早就提到矢部(Yabe)在云南石炭纪地层中曾找到过裂孔层孔虫(Disjec-topora),但既无图版,又无描述,确切的产地和层位也都不详。而且,裂孔层孔虫属是不是属于层孔虫目,目前的意见还不一致。早石炭世层孔虫在欧洲曾有记载。早在1862年麦克考伊(M'coy)在爱尔兰的石炭系描述过Stromatopopra subtilis M'coy;丹提(Danty,1893)在德国阿亨附近的艾特隆层(Etroeungt)中,描述过Clathrodictyon aquisgranense Danty;古瑞希(Gürich,1904)在波兰克腊可夫相当于艾特隆层中也找到过Stromatoporella cracoviensis Gürich。此后,史     

粤、湘、鄂早石炭世含有孔虫地层及其对比

粤、湘、鄂地区早石炭世地层,根据有孔虫组合总貌以及含有孔虫地层的沉积特征,可以江南古陆为界分为两大区。江南古陆以南包括湘中、湘南及广东诸地区,含有孔虫地层较发育,各阶段有孔虫组合特征比较明显,属种丰富。在这个地区的大部,整个下石炭统除岩关阶邵东组以及大塘阶测水组以碎屑岩沉积为主,仅在少数地点发现有孔虫外,其余各地层单位中几乎大都含丰富的有孔虫。江南古陆以北的鄂西地区,下石炭统地层层序、沉积特征与苏、皖地区雷同,生物群特征也极为相似。在这一地区,有孔     

粤北韶关早石炭世大塘期牙形刺

作者发现了广东韶关早石炭世大塘期一些牙形刺,其中石磴子组11属20种(包括1新种和1新亚种),梓门桥组8属9种,并与国内外一些地区相当的牙形刺带进行了比较和讨论。对重要的台型牙形刺和新种作了简要描述。根据牙形刺的面貌,梓门桥组中下部可能属早石炭世。     

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.     

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