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。     

枸杞木虱成虫携带瘿螨越冬

多年来一直认为枸杞瘿螨Aceria pallida Kefer以成螨在树皮缝和芽缝内越冬,我们在宁夏中宁最新调查发现,大量瘿螨若螨潜伏于枸杞木虱越冬成虫体壁缝隙,尤其以后足基节与腹部缝隙最多。初步调查结果显示,越冬枸杞木虱Poratrioza sinica Yang et Li成虫雌性和雄性成虫均携带瘿螨成螨和若螨,平均2~3头,最多的可达30头。如果枸杞瘿螨随枸杞木虱越冬成虫越冬成为主要途径,那么对枸杞木虱越冬成虫的防治将成为控制枸杞瘿螨危害的重要防治策略和技术手段。     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

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     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.