新疆岩螨属一新种：蜱螨目：叶螨科

岩螨属Petrobia Murray,1877至今全世界已知32种。我国曾报道过4种(王慧芙,1981)。本文记述1新种。测量单位为μm。新疆岩螨Petrobia xinjiangensis Tan et Wang,新种(图1—13) 雌螨:体长467,包括喙591,宽364;卵圆形,褐红色。 须肢跗节长为宽的2倍,背感器棒形,具明显横纹;端感器和刺突均为刺状,等长。口针鞘前端圆钝;气门沟末端缠结,个体间形状、大小有差异。 前足体背中央部位光滑,侧面表皮纹纵向;后半体背表皮纹横向。背毛粗壮,近末     

云南叶螨属二新种记述(蜱螨目:叶螨科)

在鉴定云南叶螨标本时,发现叶螨属二新种,兹记述如下。模式标本保存于上海农学院。(文内量度单位均为微米)。 野葵叶螨Tetranychus malvae新种(图1—7) 雌螨 体长(包括喙)556,体宽344。体椭圆形,红色。 须肢端感器圆柱形,长6.2,宽4.2。背感器棒形,长6.7。两刺状毛长度约等,为8.5。口针鞘前端圆钝。气门沟U形弯曲。 背表皮纹纤细,在第三对背中毛间和内骶毛间为纵向,形成菱形纹。背毛12对(缺臀毛),刚毛状,具细茸毛,不着生在结节上。背毛长于横列间距。背毛长度如下:第1—3     

缺爪螨属一新种(蜱螨目:叶螨科)

缺爪螨属Aponychus Rimando,1966隶属于广叶螨族Eurytetranychini Reck,全世界已报道了11种。该属种类我国曾报道过一种竹缺爪螨Aponychus corpuzae Rimando。本文再记述我国的一个新种。 泰山缺爪螨Aponychus taishanicus新种 雌螨 体长(包括喙)307微米,体宽226微米。浅黄白色,体缘有黑色斑点。宽椭圆形,背部隆起。 须肢端感器棍状,其长约为宽的3—4倍。背感器稍短于端感器;刺状毛粗壮,稍长于端感器。口     

腐食酪螨成螨形态观察

利用光学显微镜观察腐食酪螨成螨外部形态特征。通过观察发现,腐食酪螨雄性成螨体长约300～440μm,表皮光滑,附肢4对呈淡棕色,各足均着生有刚毛和感器;胛内毛（sci）较胛外毛（sce）长;基节上毛（ps）膨大且有刺状侧突;背毛（d）4对,d1最短,d4最长;腹面可见圆形的肛吸盘和前肛毛（pra）各1对。雌螨体型较雄螨大,长约486～492μm,生殖区位于腹面第Ⅲ、Ⅳ基节之间,生殖毛3对;肛门达躯体末端,周围着生有肛毛（a）5对,肛后毛（pa）3对。通过对腐食酪螨成螨外部形态结构的观察为其科学分类提供了实验依据。     

安徽始叶螨属一新种(真螨目:叶螨科)

1982年在安徽合肥进行叶螨种类调查时,发现始叶螨属一新种,今记述如下。模式标本保存于安徽大学生物系。 梧桐始叶螨Eotetranychus firmianae新种(图1—10) 雌螨 体长409微米(包括喙),体宽214微米。背面观椭圆形。须肢跗节端感器圆柱形,长5.65微米,宽2.26微米;背感器小棒状,长2.26微米,短于端感器。刺状毛二根,长     

横断山区叶螨新种和新纪录(蜱螨目:叶螨科)

中国科学院综合考察队于横断山区采获一批叶螨标本。本文记述始叶螨属Eotetranychus二新种及一新纪录种。模式标本保存于中国科学院动物研究所。 杉木始叶螨Eotetranychus cunninghamiae Wang新种(图1-11) 雌螨 体长338微米,体宽153微米。体形椭圆。须肢附节端感器柱形,其长为宽的2倍;背感器梭形,与端感器等长;刺状毛稍长于端感器。气门沟末端呈L形弯曲。背毛末端尖细,具茸毛,共13对,其长度明显超过横列间距。前足体第2对背毛最长,达131.1微米,后半体第1—3对背中毛长度分别为122.5、116.9、102.6微米。内、外骶毛长度分别为82.7和71.2微米,臀毛长57微米。后半体第1—3对背侧毛长度分别为128.3、     

瘿螨科一新属六新种记述(蜱螨亚纲：瘿螨总科)

本文记述瘿螨科Eriophyidae一新属六新种。所用量度单位为μm。模式标本保存在南京农业大学植保系。新波羽瘿螨属Neocymoptus新属体纺锤形。背盾板近三角形,前叶突较明显,其端部中央略凹陷,背瘤位于盾后绿,背毛后指。缺基节刚毛1。足各节俱全,有模式刚毛,羽状爪单一。大体背坏波状,侧毛和腹毛俱全。1竹新波羽＠螨Neqopsbonlousae新种（图1～5）雌螨：体纺锤形,长132,宽48,厚41。赚长18,斜下伸。背盾板长33,宽40,前叶突较明显,其端部中央略凹陷;背中线完整呈断续状,侧中线和亚中线完整,侧中线波状,后端相向会合;背瘤位…     

山西历螨一新种

作者等在晋南临汾地区进行恙虫病调查期间采获一批螨类标本 ,经研究发现其中一厉螨标本为一新种 ,兹记述如下 :山西历螨 Laelapsshanxiensis,新种鉴别特征 :本新种近似纳氏厉螨 ( Laelaps nuttalli) ,但新种 4的间距大于 1的间距 ,S8长为 S7长的 2 /3,胸板较长而后缘具深凹。种的记述 :雌螨　体呈椭圆形 ,长 72 3μm,宽 5 5 0μm,背板几盖住整个背部 (图 1a) ,长 6 96μm,宽5 2 8μm,板上具 39对针状背毛。S8长约为 M11之半。螯肢定趾上的钳齿毛端部膨大 ,末端尖 ,状似土尔克厉螨 ( L aelaps turkestanicus)的钳齿毛(图 1c)。胸板前缘…     

珠恙螨属一新种：真螨目：恙螨科

本文描述1个珠恙螨属 Doloisia一新种,采自广东省罗定县社鼠 Rattus confucianus 鼻内,其感器双角状,盾板后侧毛的分枝长密,前侧毛光裸;足指数795。     

叶螨属二新种(蜱螨目:叶螨科)

1976年,在我国西北地区调查时,发现叶螨属二新种,记述如下。模式标本保存于中国科学院动物研究所。敦煌叶螨Tetranychus dunhuangensis,新种(图1—12) 雌螨 体长471微米,包括喙529微米,体宽278微米。椭圆形,黄绿色,体侧各有三个大型黑斑。足及颚体部分色稍浅,呈黄色;前足端部呈土黄色。 须肢端感器呈柱形,其长约为宽的2倍;背感器小棍状,稍短于端感器;刺状毛明显地     

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     

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.