贵州省襀翅目昆虫之三(襀翅目:襀科、卷襀科)

贵州省的(衤责)翅昆虫种类丰富,作者(1990)在第一篇报道中除整理了贵州省此目已知纪录外,增加贵州2个新记录种和1个新种,第二篇(1991)又报道了贵州3个新记录种及1个新种,均刊载在《贵州科学》上。本文为贵州茂兰自然保护区的(衤责)翅目昆虫研究报告,增加了3个贵州省新记录种并描记2新种,模式标本保存在北京农业大学昆虫标本室。     

中国广翅目新种及新纪录属种

本文记述了齿蛉科(Corydalidae)一新种及—中国新纪录属种。模式标本保存在北京农业大学昆虫标本室。 1.东方斑鱼蛉 Neòchauliodes orientalis 新种(图1—2) 体长23—30mm,前翅长32—48mm,后翅长29—42mm。 头部浅黑色,头顶近三角形。复眼褐色:单眼黄色,内缘黑色。触角黑色,雄蛉栉状,     

贵州省黔东南州锹甲科(鞘翅目:金龟总科)昆虫调查初报

对贵州省黔东南州的锹甲科Lucanidae(鞘翅目:金龟总科)昆虫进行调查研究,查视锹甲科昆虫标本100余号,鉴定得到锹甲8属19种(亚种),其中包括15个贵州新纪录种(亚种).所有查视标本保存在凯里学院昆虫标本室.     

中国泰莱蛛属一种种记述（蜘蛛目：泰莱蛛科）

记述了采自贵州荔波县茂兰自然保护区的泰莱蛛属1新种：凉席泰莱蛛Telema liangxi sp.nov。新种与Telema dongbei Wang et Ran,1998近似,但螯肢齿堤无齿,雄蛛触肢器生殖球梨形,插入器长,雌蛛纳精囊末端膨大呈梨形,可与之区别,正模♂,贵州荔波县茂兰自然保护区凉席洞,1999年11月5日,陈会明采;副模2♀♀,同正模,模式标本保存在河北大学生命科学学院。     

贵州迷蚜蝇亚科新种与新记录：（双翅目：食蚜蝇科）

双翅目(Diptera)蚜蝇科(Syrphidae)的迷蚜蝇亚科(Milesiinae)属种繁多,其幼虫多为腐食性,生活在树干创伤、树洞、树桩、落叶及污水粪肥中;有些为植食性,危害园艺作物和中药等。成虫多访花而似蜂类。贵州省此类昆虫研究较少,本文记述4新种和3个贵州新记录种。模式标本保存在北京农业大学昆虫标本室。     

发现于贵州的中国新记录科—极蚊科并记述一新种：（双翅目：长角亚目）

双翅目长角亚目的极蚊科(Axymyiidae)为中国新记录科,是极罕见的昆虫,世界只记载过5种;现报道贵州梵净山的1个新种,模式标本藏北京农业大学昆虫标本室。 极蚊体型中等,粗壮而色暗,外貌象毛蚊类,Coquillett(1909)曾将北美种包括在毛蚊科的Eupeitenus属内。McAtee(1921)建立了Axymia furcata新属种,同时由Shannon(1921)讨论了其分类地位,作为殊蚊科(Anisopodida=Rhyphidae)的1个新     

广西齿蛉九新种及我国新记录的属种(广翅目:齿蛉科)

广西自治区的广翅目(Megaloptera)昆虫较为丰富,我们在1963、1982及1984曾三次赴广西采集,得到相当数量的标本;加上其它单位所采赠或惠借的标本,已有6属20种,这些已编成检索表包括在《广西森林昆虫》的书稿中。其中有九个新种,一个中国新记录种和二个初次报导的属需要先加记述,在此发表。     

贵州兰科植物的新记录

报道了贵州兰科的3个新记录属:羽唇兰属、坛花兰属、异型兰属;以及9个新记录种:羽唇兰、坛花兰、异型兰、等萼卷瓣兰、广西舌喙兰、广西鸢尾兰、勐海隔距兰、长足石仙桃、长距虾脊兰。凭证标本保存在茂兰保护区标本室(HML)。     

茂兰国家级自然保护区石松类和蕨类植物区系特征

本研究通过野外考查、标本采集和分类鉴定，以及文献资料整理，对贵州茂兰国家级自然保护区石松类和蕨类植物区系组成和分布区类型进行统计分析。结果显示：(1)茂兰国家级自然保护区共有石松类和蕨类植物32科76属237种，优势科为鳞毛蕨科(Dryopteridaceae)、蹄盖蕨科(Athyriaceae)、凤尾蕨科(Pteridaceae)、水龙骨科(Polypodiaceae)；优势属为双盖蕨属(Diplazium)、卷柏属(Selaginella)、凤尾蕨属(Pteris)。(2)分布区类型以东亚广布和热带亚洲分布为主，生态类型以阴生植物和土生植物居多。(3)与其他地区的区系比较显示，茂兰与广西花坪物种相似性系数最高，依次是贵州梵净山、四川峨眉山和云南马关县。     

中国洞穴产类球蛛属蜘蛛一新种(蜘蛛目,类球蛛科)

记述产自贵州省荔波县茂兰国家级自然保护区的类球蛛科类球蛛属1新种,命名为荔波类球蛛Nesticus libo sp.nov..模式标本保存在贵州茂兰国家级自然保护区管理局科研科和河北大学生命科学学院.正模♂,副模1♂,4♀♀,贵州茂兰国家级自然保护区翁外洞,2000年11月13日,陈会明采.鉴别特征:新种近似于上野类球蛛Nesticus uenoi Yaginuma,1972(296,fig 24-26,47,49),但其雄蛛触肢器的中突呈杵状,副跗舟的内侧分叉大;雌蛛外雌器的中隔呈梯形,而不同于后者.     

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