宁波四明山区的蜻蜓

2009—2010年对宁波四明山地区的蜻蜓资源进行了野外调查,共采集蜻蜓标本460只,隶属9科32属43种。蜻科Libellulidele为优势科(17种,占总数的39.5%),灰蜻属Orthetrum为优势属(5种,占属总数的15.6%)。单种单属有25个,占总属数的78.1%,说明四明山区蜻蜓区系在起源和构成上比较复杂。四明山区蜻蜓区系以东洋区和跨古北区-东洋区种类占优势。调查发现水体污染、湿地过度开发利用已经成为该地区蜻蜓目昆虫及其它水生生物面临的主要威胁。     

南京老山地区蜻蜓目昆虫区系分析及多样性研究

2005～2007年对南京老山地区蜻蜓目昆虫进行了调查研究,通过对采集标本的鉴定和分类,初步确定南京老山地区蜻蜓目昆虫有2亚目6科21属30种, 其中7种是江苏省新纪录.其区系组成的特点是:东洋区有8种,占总数的26.67%;古北区有2种,占总数的6.67%;东洋区-古北区有11种,占总数的36.67%;广布种有9种,占总数的30.00%.通过对春、夏、秋三季蜻蜓多样性的研究,发现春、夏、秋三季蜻蜓的种类数量为夏季>春季>秋季.     

宁夏灵武白芨滩国家级自然保护区半翅目昆虫多样性及区系研究

选取宁夏灵武白芨滩国家级自然保护区的人工次生林地(白芨滩样地)、干旱山地(宁东样地)、荒漠干草原(马鞍山样地)、人工固沙治理区(枣泉样地、磁窑堡样地)、流动-半流动沙丘地(甜水河样地、大泉样地、羊场湾样地)等5类生境8个样地,按照样线法进行随机采集,对半翅目昆虫的多样性及区系组成进行了调查研究。结果表明,该保护区共有半翅目昆虫8科29属40种,其中长蝽科为第一大优势科,其次为蝽科。优势种2种:桃红长蝽和横带红长蝽,常见种20种,稀有种18种。8个样地Shannon-Wiener多样性指数由高到低依次为:大泉、白芨滩、马鞍山、甜水河、磁窑堡、宁东、羊场湾、枣泉。以物种在生境中分布的有无,进行0-1数据系统聚类分析,结果显示人工固沙治理区和流动-半流动沙丘地物种组成相似性最高,干旱山地与其他生境差异最大;生境质量是影响半翅目昆虫多样性的主要因素。区系分析显示:保护区在世界地理区划中以古北区占绝对优势(87.50%),在中国动物地理区划中,保护区共有7类21种区系型,区系成分较为复杂。     

宁夏黄河湿地蝗虫区系组成分析

宁夏黄河湿地现已知有44种蝗虫,隶属2总科8科24属,占全自治区蝗虫总种数的50.57%。湿地蝗虫在种类组成上以蝗总科中的斑翅蝗科为优势类群,共计12属15种,占总种数的34.09%。网翅蝗科次之,共计3属11种,占总种数的25%。区系成分分析结果表明,宁夏黄河湿地蝗虫完全为古北界区系成分。在中国地理区划中有17个区系型,以蒙新区特有种所占比例最高,计17种,占总种数的38.64%。其次为蒙新区—青藏区系型,计4种,占9.09%。以宁夏黄河湿地11个自然行政地理区划为分类单元,对其种类生态地理分布进行聚类分析,探讨了地理生态环境与生物物种多样性之间的关系。     

江西省海会地区蜻蜓目昆虫区系分析

2004-2005年对江西海会地区蜻蜓资源进行了调查。标本经鉴定,初步确定海会地区蜻蜓目昆虫共计2亚目、10科、35属、52种,其中31种是江西省新记录。其区系组成的特点是：东洋成分占明显优势,有34种,约占总数的65．4％;古北区的种类相对较少,有16种,约占总数的30．8％。     

宁夏六盘山地区蝶类区系研究

分析研究六盘山地区蝶类区系,结果表明:六盘山地区蝴蝶共有5科68属130种,其中宁夏新纪录种52种;组成以古北区和东洋区共有种为主体,占总种数的67.69%;区系过渡性明显。     

广东大雾岭自然保护区蜻蜓调查初报

记载广东大雾岭自然保护区蜻蜓目昆虫2亚目11科26属49种,包括差翅亚目6科16属28种,束翅亚目5科10属21种.其中,沃尔内春蜓Nepogomphus walli(Fraser,1924)、大黄赤蜻Sympetrum uniforme Selys,1883、赤斑异痣 Ischnura mildredae Fraser,1927、红腹丽扇 Calicnemis erythwomelas Selys,189l为广东新记录.研究标本保存于中山大学昆虫学研究所昆虫标本馆.     

井冈山自然保护区蜻蜓目昆虫资源调查

为明确井冈山自然保护区蜻蜓目昆虫种质资源和群落特征,为蜻蜓目昆虫资源的保护和合理利用提供理论依据,2018-2021年在井冈山自然保护区选取长古岭（海拔470 m左右）、大井（海拔930 m左右）、黄洋界（海拔1 200 m左右）3个不同海拔样地开展蜻蜓资源调查。采用Simpson优势集中性指数、Pielon均匀度指数、Berger-Parker优势度指数和Shannon-Wiener多样性指数对3个样地的蜻蜓进行多样性分析。共采集到标本483只,隶属于2亚目8科16属23种,其中蜻科（Libellulidae）占据绝对优势,属数和种数分别占总数的37.50%和56.52%;大井和黄洋界的群落结构指标均无显著差异（P > 0.05）,大井和黄洋界的多样性指数、均匀度指数均显著高于长古岭（P<0.05）,而优势度指数、优势集中性指数则显著低于长古岭（P < 0.05）。结果表明井冈山自然保护区内海拔较低的长古岭蜻蜓目昆虫群落的多样性较低,但优势种的地位更为突出。     

虎伯寮国家级自然保护区蜻蜓调查初报

本文报道福建省南靖县虎伯寮国家级自然保护区蜻蜒目昆虫2亚目14科45属64种.其中福建省新记录1科4属10种.区系分析表明,虎伯寮自然保护区明显处于东洋区范畴,虎伯寮的蜻蜓具有明显的热带北缘及亚热带区系色彩.     

北洛河流域食蚜蝇科区系分析

依据世界动物地理区划及中国动物地理区划,对北洛河流域的食蚜蝇科昆虫进行区系分析。北洛河流域在动物地理区划上隶属于古北界的华北亚区,该区分布有食蚜蝇科昆虫52种,隶属于2亚科11族29属,其中包括2个中国新纪录种和7个陕西新纪录种。其区系组成特点是：古北界有17种,占总数的32.70%,古北界和东洋界共有种有35种,占总数的67.31%。     

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