无齿木虱属一新种记述（半翅目：木虱总科：木虱科）

记述采自中国上海的无齿木虱属1新种:上海无齿木虱Edentatipsylla shanghaiensis Li et Chen,sp.nov.,给出危害海桐属植物的无齿木虱属名录,并重新组合和提供分种检索表。模式标本分别保存在中国农业大学昆虫标本馆和上海植物园昆虫标本馆。     

二种木虱的染色体行为研究(同翅目:木虱总科)

报道了2种中国木虱的精子发生,即香椿巴木虱Bharatiana setentrionalis Yang et Li,n=7（XO）;合欢羞木虱Acizzia jamatonica（Kuwayama）,n=13（XO）。研究表明木虱的减数分裂具有3个显著的特征：1）前期I具有弥散期,此时常染色体疏松化,分散于整个细胞核,仅可以观察到异固缩化的性染色体,推测存在基因转录现象,同样的现象存在于蜡蝉和异翅类（Heteroptera）昆虫;2）中期Ⅰ姊妹染色体联合定向,第一次分裂为减数分裂;3）第二次分裂不发生胞质分裂,形成双核精子。从生殖系统的结构和减数分裂中染色体的行为来看,木虱与蜡蝉的关系更为密切。     

广西木虱科大新种(同翅目:木虱总科)

本文记述了采自我国广西及海南的木虱科6新种,隶属于木虱属Psylla和喀木虱属Cacopsylla;在标本的采集中承蒙广西农科院周至宏同志、王助引同志的帮助和支持,谨致谢意。模式标本保存于北京农业大学昆虫标本馆。     

澳大利亚木虱在中国发生

Blastopsylla occidentalis Taylor是原产于澳大利亚的木虱种类,目前已经扩散到北美、南美、非洲、欧洲和亚洲.本文记述了B.occidentalis在中国的发生,并首次记录了其在澳大利亚以外的地区被寄生.这个种依赖于桉属Eucalyptus植物,其寄主超过20种,这可能是使其在世界范围扩散的一个重要因素.指出了B.occidentalis与桉树芽木虱Blastopsylla barbara Li为同种异名.     

华卵痣木虱的形态特征及其潜在危险性分析

华卵痣木虱Macrohomotoma sinica Yang et Li是2005年首次在上海发现的地区一种新害虫。描述华卵痣木虱各虫态的形态特征。其成虫的产卵或若虫危害期与小叶榕新叶抽出期相吻合。对该虫的潜在危险性进行初步分析。     

橄榄星室木虱药剂防治研究

橄榄星室术虱Pseudophacopteron canarium Yang et Li隶同翅目木虱科,是橄榄新梢的重要害虫。近年来,橄榄星室术虱在橄榄上严重发生为害,造成新梢难于抽发,树势衰弱,致使橄榄减产和品质下降,给橄榄生产威胁极大。对橄榄星室木虱以化学药剂防治为主,     

明脉喀木虱Cacopsylla hyalinonemae Li&Yang,1989雄性首次描述(半翅目:木虱总科:木虱科)

首次描述了明脉喀木虱Cacopsylla hyalinonemae LiYang的雄性,对雌性进行了详细的重新描述,并给出了本种的主要特征图,背面、侧面以及头部正面的形态照片。标本保存于贵州大学昆虫研究所。     

西藏个木虱科一新属三新种：同翅目：木虱总科

本文记述产于西藏自治区的个木虱科Ｔｒｉｏｚｉｄａｅ１属３新种。三毛个木虱属Ｔｒｉｓｅｔｉｔｒｉｏｚａ,ｇｅｎ,ｎ．,其模式种为椿突三个木虱Ｔ．ｃｌａｕｌｌａｔａ,ｓｐｎ．,其寄主为杜荆Ｖｉｔｅｘｓｐ．。另外２个新种是：黄边个木虱Ｔｒｉｏｚａａｕｒａｔｉｌａｔｅｒｌｉｓ,察隅个木虱Ｔｒｉｏｚａ ｚａｙｕｎｓｉｓ。模式标本保存于北京农业大学昆虫标本室。     

个木虱科一新属三新种：同翅目：木虱总科

为纪念昆虫分类学家周尧教授执教五十周年和由他创办并主编的《昆虫分类学报》创刊十周年,特选了他在五十年前(1928年)由四川康定和1983年“太白山昆虫考察组”采集的木虱标本撰写此文。本文包括了个木虱科(Triozidae)的一新属三新种。模式标本保存在北京农业大学昆虫标本室。     

偏角飞虱属分类研究(同翅目,蜡蝉总科,飞虱科)

对偏角飞虱属Neobelocera Ding et Yang的种类进行了系统整理,共4种,即偏角飞虱Neobelocera asymmetrica Ding et Yang(云南)、浙江偏角飞虱N.zhejiangensis(Zhu)(浙江、安徽)、汉阴偏角飞虱N.hanyinensis Qn etYuan(陕西)、兰坪偏角飞虱N.lanpingensis Chen(云南).对属征进行了拟定,编制了种检索表,简述了已知种的分布、寄主.描记了采自湖南张家界国家森林公园的1新种,即侧刺偏角飞虱N.laterospina sp.nov.,提供了该新种及兰坪偏角飞虱N.lanpingensis Chen的特征图.研究标本及新种模式标本保存于贵州大学昆虫研究所.     

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.     

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