四索跳小蜂属二新种(膜翅目:跳小蜂科)

本文记述跳小蜂科四索跳小蜂属二新种,白轮蚧四索跳小蜂Ｐｌａｇｉｏｍｅｒｕｓ ａｕｌａｃａｓｐｉｓ ｓｐ．ｎｏｖ．和大棒四索跳小蜂Ｐｌａｇｉｏｍｅｒｕｓ ｍａｇｎｉｃｌａｖｕｓ ｓｐ．ｎｏｖ．标本采自云南省,从柑桔上的盾蚧育得。     

扁角跳小蜂二新种记述(膜翅目:跳小蜂科)

本文描述从蜡蚧中育出的扁角跳小蜂二新种,即食红扁角跳小蜂Anicetusrubensisp.nov．和寡毛扁角跳小蜂Anicetusrarisetussp.nov.,前者育自红蜡蚧,后者育自日本蜡蚧、红蜡蚧和角蜡蚧。     

中国花翅跳小蜂族二新种(膜翅目,跳小蜂科)

记述采自辽宁沈阳和大连的跳小蜂2新种,即丽柄虱克跳小蜂Aschitus scapus Xu,sp.nov.和短颊赛诺跳小蜂Xenoencyrtus brevimalarus Xu,sp.nov..虱克跳小蜂属Aschitus Mercet和赛诺跳小蜂属Xenoencyrtus Riek为我国新纪录属.     

中国跳小蜂二新纪录属及三新种(膜翅目,跳小蜂科)

报道采自福建福州、吉林长春的3种跳小蜂,即桔小食甲跳小蜂Cerchysiella citricola Xu,sp.nov.,寄主为日本方头甲Cybocephalis nipponicus Endr.-Younga,初级寄主为柑橘类;扁角尼克跳小蜂Neocladella platicornis Xu,sp.nov.寄主不明和短翅思奇跳小蜂,其触角扁平膨大;短翅思奇跳小蜂Schilleriella brevipterus Xu,sp.nov.寄主为粉蚧,其前翅退化缩短.对新种进行了详细描述.本文也是尼克跳小蜂属Neocladella Girault和思奇跳小蜂属Schilleriella Ghesquiere在我国分布的首次记录.标本保存在浙江大学农业与生物技术学院应用昆虫研究所.     

四突跳小蜂亚科三新记录属及三新种记述(膜翅目:跳小蜂科)

记述采自辽宁、黑龙江和新疆的3个跳小蜂属：卡丽跳小蜂属Charitopus Forster、裂脖跳小蜂属Rhopus Forster和塞克跳小蜂属Sakencyrtus Hayat,均为我国首次记录。共记述4个种,其中卡丽跳小蜂属有1中国新记录种,即暗色卡丽跳小蜂Charitopus obscurus(Erdoes);裂脖跳小蜂属2新种,即短翅裂脖跳小蜂Rhopus brachypterous Xu．sp．nov．和黄色裂脖跳小蜂Rhopus flavus Xu,sp．nov．;塞克跳小蜂属1新种,即长尾塞克跳小蜂Sakencyrtus longicaudus Xu．sp．nov．。     

中国拟细角跳小蜂属分类学研究（膜翅目: 跳小蜂科）

对中国拟细角跳小蜂属Leptomastidea 分类研究进行了回顾, 并记述了分布于中国的拟细角跳小蜂属6 种, 其中草居拟细角跳小蜂L. herbicola, 红胸拟细角跳小蜂L. rubra 和谢氏拟细角跳小蜂L. shafeei为中国新记录种。文中提供了分种检索表、形态特征图。研究标本保存在中国科学院动物研究所。     

四突跳小蜂亚科中国一新纪录属(膜翅目,跳小蜂科)

记述了跳小蜂科中国1新纪录属,阿奴跳小蜂属Anusia F(o)rster,及中国1新纪录种,扁角阿奴跳小蜂Anusia nasicornis F(o)rster,并给出了其形态特征图.研究标本保存在中国科学院动物研究所动物标本馆.     

花翅跳小蜂属一新种：膜翅目：跳小蜂科

花翅跳小蜂属(Microterys Thomson,1876)是蜡蚧科昆虫的重要天敌,白蜡虫花翅跳小蜂(M.ericeri Ishii)因寄生于经济益虫白蜡虫(Ericerus pela Chavannes)而对人类有害,但绝大多数为益虫。本属是个大属,已描述了150多种,东洋区记载了20种。廖定熹教授在《中国经济昆虫志》[第三十四册,小蜂总科(一)]中记述了中国的花翅跳小蜂3种,即:白蜡虫花翅跳小蜂(M.ericeri Ishii)、球蚧花翅跳小蜂(M.clauseniCompere)和蜡蚧花翅跳小蜂(M.speciosus Ishii),黄春梅报道了采自福建的二带花翅跳小蜂(M.ditaeniatus Huang),姜德全描记了从白蜡虫雌虫卵囊中羽化的中华花翅跳小蜂     

外引迪氏跳小蜂与本地粉蚧长索跳小蜂的竞争比较

初步研究了美国引进的迪氏跳小蜂Zarhopalus debarri与本地粉蚧长索跳小蜂Anagyrus dactylotpii(Howard)竞争的情况,结果表明,即使在种群数量占优的情况下,在竞争中迪氏跳小蜂仍处于明显的劣势,而且两种寄生蜂在混合种群中相互排斥的.在林间释放迪氏跳小蜂,也未能在林间找到子代蜂推测林间存在的本地蜂是影响外引蜂的定居与繁殖因素之一.     

中国斑翅跳小蜂属一新种(膜翅目,跳小蜂科)

记述了育自上海桃树上1种盾蚧中的斑翅跳小蜂属1新种:上海斑翅跳小蜂Epitetracnemus shanghaiensis sp.nov..文中给出了新种的形态特征图和该属分种检索表.研究标本保存于中国科学院上海生命科学研究院植物生理生态研究所.     

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