西藏沙蜥属一新种—泽当沙蜥

根据形态特征,泽当居群与西藏沙蜥、红尾沙蜥有显著区别,为沙蜥属一新种：泽当沙蜥Ｐｈｒｙｎｏｃｅｐｈａｌｕｓ ｚｅｔａｎｇｅｎｓｉｓ ｓｐ．ｎｏｖ．Ｗａｎｇ,Ｚｅｎｇ ｅｔ Ｗｕ鉴别特征为鼻鳞１枚;鼻间鳞４－５枚;背鳞数少于腹鳞数;雄性尾末端黑色,雌性灰白色。     

三种沙蜥核型的比较研究

本文报道了白条沙蜥Ｐｈｒｙｎｏｃｅｐｈａｌｕｓ ａｌｂｏｌｉｎｅａｔｕｓ,东疆沙蜥Ｐ．ｇｒｕｍｇｒｉｚｉｍａｌｏｉ及西藏沙蜥Ｐ．ｔｈｅｏｂａｌｄｉ的核型,西藏沙蜥２ｎ＝２２Ｉ＋２６ｍ,ＮＦ＝４８,其余二者２ｎ＝２２Ｉ＋２４ｍ,ＮＦ＝４６。与同属已知其它的核型进行了比较。沙蜥属中至少存在２ｂ＝４６和２ｎ＝４８两种核型类群,二者可能与“沙蜥属物种形成的两个起源中心”的假说相关。讨论了沙蜥属中的核型演化     

珀蝽属中国种类记述（半翅目：蝽科）

本文为珀蝽属中国种类的一次修订,共记述５个种和１个亚种,其中包括２个新种（邻珀蝽、黄珀蝽）和１个新亚种（庐山珀蝽云南亚种）。并对与中国区系有关的Ｐ．ｓｐｌｅｎｄｅｎｓ Ｄｉｓｔａｎｔ和Ｐ．ｖｉｒｉｄｉｃｏｌｌｉｓ模式标本作了重新描述。     

西藏新蝎蛉属昆虫三新种记述(长翅目:蝎岭科)(英文)

本文记述中国西藏自治区的新蝎蛉属 Ｎｅｏｐａｎｏｒｐａ Ｗｅｅｌｅ昆虫３新种：西藏新蝎岭 Ｎｅｏｐａｎｏｒｐａｔｉｂｅｔｅｎｓｉｓ Ｈｕａ ｅｔ Ｃｈｏｕ, ｓｐ． ｎｏｖ．（正模,西藏通麦, ２０５０ ｍ）,胡氏新蝎蛉 Ｎｅｏｐａｎｏｒｐａ ｈｕｓｈｅｎｇｃｈａｎｇｉＨｕａ ｅｔ Ｃｈｏｕ, ｓｐ． ｎｏｖ．（正模,西藏樟木口岸）,以及李氏新蝎蛉 Ｎｅｏｐａｎｏｒｐａ ｌｉｆａｓｈｅｎｇｉ　ｈｕａ　ｅｔ　Ｃｈｏｕ,ｓｐ． ｎｏｖ．（正模：,西藏易贡, ２３００ ｍ）。简述了西藏长翅目的分类历史和现状,证实过去记载所谓的三种西藏蝎蛉（模式产地均为马边）,即Ｐａｎｏｒｐａ　ｇｕｔｔａｔａ　Ｎａｖａｓ,Ｐ．ｄａｖｉｄｉ　Ｎａｖａｓ,和Ｐ．ｓｔｉｇｍａｌｉｓ　Ｎａｖａｓ,实际上均为四川省种类。新种模式标本分别保存在西北农业大学昆虫博物馆和中国农业大学昆虫标本室。     

假希瓦格■(Pseudoschwagerina)若干种(亚种)分类问题的研究

本文研究了Ｐｓｅｕｄｏｓｃｈｗａｇｅｒｉｎａｕｄｄｅｎｉ，Ｐ．ｖｕｌｇａｒｉｓ，Ｐ．ｆｕｓｉｆｏｒｍｉｓ，Ｐ．ｂｅｄｅｉ和Ｐ．ｐａｒａｂｅｅｄｅｉ的１２３个标本的薄片和照片，对这５个种及其所含亚种的形态特征进行了详细的度量，并采用多元判别分析方法对各种、亚种的形态特征进行了定量对比。定量分析和定性研究的结果表明，Ｐ．ｕｄｄｅｎｉｒｕｓｉｅｎｓｉｓ和Ｐ．ｖｕｌｇａｒｉｓａｓｈｅｎｓｉｓ，Ｐ．ｖｕｌｇａｒｉｓａｋｔｊｕｂｅｎｓｉｓ以及Ｐ．ｆｕｓｉｆｏｒｍｉｓｃｒａｓａ，Ｐ．ｆｕｓｉｆｏｒｍｉｓｐｌｉｃａｔａ等亚种定义中的主要形态特征实际上仅仅反映了Ｐ．ｕｄｄｅｎｉ，Ｐ．ｖｕｌｇａｒｉｓ，Ｐ．ｆｕｓｉｆｏｒｍｉｓ种内的个体变异，Ｐ．ｂｅｄｅｉｕｒａｌｅｎｓｉｓ和Ｐ．ｐａｒａｂｅｄｅｉ与Ｐ．ｂｅｄｅｉ的形态特征在统计上非常相似。建议废除Ｐ．ｕｄｄｅｎｉ，Ｐ．ｖｕｌｇａｒｉｓ，Ｐ．ｆｕｓｉｆｏｒｍｉｓ和Ｐ．ｂｅｄｅｉ种内的亚种名称，并将Ｐ．ｐａｒａｂｅｄｅｉ视为Ｐ．ｂｅｄｅｉ的晚出同义名。     

六种云杉的核型分析

对６种（含１变种）云杉属植物的染色体数目及形态特征进行了分析研究。研究树种均为我国特有种,其中４种在本文中首次报道。分析材料全部取自各树种中心产区的原始林内。其核型公式：鳞皮云杉（Ｐ．ｒｅｔｒｏｆｌｅｘａ）Ｋ（２ｎ）＝２４＝２２ｍ＋２ｓｍ;云极（Ｐ．ａｓｐｅｒａｔａ）Ｋ（２ｎ）＝２４＝２０ｍ＋４ｓｍ;青插（Ｐ．ｗｉｌｓｏｎｉｉ）Ｋ（２ｎ）＝２４＝２０ｍ＋４ｓｍ＋１Ｂ;紫果云极（Ｐ．ｐｕｒｐｕｒｅａ     

假希瓦格Ting（Pseudoschwagerina）若干种（亚种）分类问题的研究

本文研究了Ｐｓｅｕｄｏｓｃｈｗａｇｅｒｉｎａ ｕｄｄｅｎｉ,Ｐ．ｖｕｌｇａｒｉｓ,Ｐ．ｂｅｅｄｅｉ和Ｐ．ｐａｒａｂｅｅｄｅｉ的１２３个标本的薄片和照片,对这５个种及其所含亚种的形态特征进行了详细的度量,并采用多多元判别分析方法对各种、亚种和形态特征进行了定量对比。定量分析和定性研究的结果表明,Ｐ．ｕｄｄｅｎｉ ｒｕｓｓｉｅｎｓｉｓ和Ｐ．ｖｕｌｇａｒｉｓ ａｓｈｅｎｓｉｓ,Ｐ．ｖｕｌｇａｒｉｓ ａｋ     

中国拟毛蚁属分类研究（膜翅目：蚁科）

在中国已记载拟毛蚁属Ｐｓｅｕｄｏｌａｓｉｕｓ Ｅｍｅｒｙ昆虫８种１亚种,其中２个根据雌蚁描述的种Ｐ．ｈｍｍｅｌｉ Ｓｔｉｔｚ和Ｐ。．ｓａｕｔｅｒｉ Ｆｏｒｅｌ的地位有待确认,亚种Ｐ．ｂｉｎｇｈａｍｉ ｔａｉｖａｎａｅ Ｆｏｒｅｌdisplay structure     

藏酋猴的分类与分布

本文基于外部形态,毛色,头骨特征和地理分布对藏酋猴进行了分类整理,认为藏酋猴在不同地理区域之间的差异已达到了亚种水平,可分为４个亚种（包括两新亚种）：Ｍ．ｔｈｉｂｅｔａｎａｔｈｉｂｅｔｎａ,Ｍ．ｔｈｉｂｅｔａｎａｐｕｌｌｕｓ．Ｍ．ｔｈｉｂｅｔａｎａｈｕａｎｇｓｈａｎｅｎｓｉｓｓｕｂｓｐ．ｎｏｖ．和Ｍ．ｔｈｉｂｅｔａｎａｇｕｉｚｈｏｕｅｎｓｉｓｓｕｂｓｐ．ｎｏｖ。     

光抑制条件下水稻籼粳亚种及其正反交F_1杂种的PSⅡ光化学效率和CO_2交换特点

测定了水稻（ＯｒｙｚａｓａｔｉｖａＬ．）不同正反交组合的ＰＳⅡ电子传递活性、Ｄ１蛋白量、叶绿素ａ荧光、净光合速率（ＰＮ）、光呼吸速率（ＰＲ）、ＲｕＢＰＣａｓｅ／Ｏａｓｅ活性,并对ＲｕＢＰＣａｓｅ进行了动力学分析。结果表明：光抑制条件下粳（ｊａｐｏｎｉｃａ）亚种中Ｄ１蛋白净降解少,ＰＳⅡ电子传递活性和光化学效率高,表现耐光抑制,而籼（ｉｎｄｉｃａ）亚种则相反,籼、粳正反交Ｆ１的上述指标介于双亲值之间且偏向其母本。进一步观察它们的ＣＯ２交换特点,所有基因型水稻ＰＲ保持稳定、ＰＮ降低,因而ＰＲ／ＰＮ增加。与耐光抑制的粳亚种相比,对光抑制敏感的籼亚种中ＰＮ降低较多、ＰＲ／ＰＮ增加较多。正反交Ｆ１杂种的ＰＲ／ＰＮ介于双亲值之间且偏向其母本。ＣＯ２交换的关键酶ＲｕＢＰＣａｓｅ／Ｏａｓｅ活性和ＲｕＢＰＣａｓｅ动力学参数没有变化且在基因型间无差异。相关分析表明,Ｄ１蛋白量与Ｆｖ／Ｆｍ、ＰＲ／ＰＮ的相关系数分别为０．９５０１和－０．９７６８。看来,质基因编码的Ｄ１蛋白是籼粳杂种稻光抑制特性及其生理遗传的分子基础。     

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.     

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     

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.     

Entwicklungsgeschichte und Ultrastruktur von Pollenkitt und Exine bei nahe verwandten entomophilen und anemophilen Angiospermensippen derAlismataceae,Liliaceae, Juncaceae,Cyperaceae, Poaceae undAraceae

Some closely related members of the monocotyledonous familiesAlismataceae, Liliaceae, Juncaceae, Cyperaceae, Poaceae andAraceae with variable modes of pollination (insect- and wind-pollination) were studied in relation to the ultrastructure of pollenkitt and exine (amount, consistency and distribution of pollenkitt on the surface of pollen grains). The character syndromes of pollen cementing in entomophilous, anemophilous and intermediate (ambophilous or amphiphilous) monocotyledons are the same in principal as in dicotyledons. Comparing present with former results one can summarize: 1) The pollenkitt is always produced in the same manner by the anther tapetum in all angiosperm sub-classes. 2) The variable stickiness of entomophilous and anemophilous pollen always depends on the particular distribution and consistency of the pollenkitt, but not its amount on the pollen surface. 3) The mostly dry and powdery pollen of anemophilous plants always contains a variable amount of inactive pollenkitt in its exine cavities. 4) A step-by step change of the pollen cementing syndrome can be observed from entomophily towards anemophily. 5) From the omnipresence of pollenkitt in all wind-pollinated angiosperms studied one can conclude that the ancestors of anemophilous angiosperms probably have been zoophilous (i.e. entomophilous) throughout.

     

Identification and Characterization of the First Equine Parainfluenza Virus 5

正Dear Editor,Parainfluenza virus 5 (PIV5), known as canine parainfluenza virus in the veterinary field, is a negative-sense,nonsegmented, single-stranded RNA virus belonging to the Paramyxoviridae family (Chen 2018). The virus was first reported in primary monkey kidney cells in 1954 (Hsiung1972), then it has been frequently discovered in various     

Pathogenic Characterization and Full Length Genome Sequence of a Reassortant Infectious Bursal Disease Virus Newly Isolated in Pakistan

<正>Dear Editor,Infectious bursal disease (IBD) is one of the most important diseases of the poultry. The IBD virus (IBDV), a nonenveloped virus belonging to the Birnaviridae family with a genome consisting of two segments of double-stranded RNA (segments A and B), targets B lymphocytes of bursa of Fabricious leading to immunosuppression. In Pakistan,poultry farming is the second biggest industry and IBD is the second biggest disease threating the poultry sector.However, there is limited genome information of IBDV