毛蚊属新种和新记录(双翅目:毛蚊科)

毛蚊属(Bibio)是毛蚊科中一个较大的属,世界已知150种以上,体多毛,雄性复眼上也常具密毛;前足腿节通常明显膨大,胫节顶端具有一粗壮的刺和一颗距;翅颜色种间多变化,C脉结束于翅顶角之前,Rs不分支;雌性腹末的尾须一节。幼虫腐生和植食性,有的种类是农业上较重要的地下害虫。此属在我国从南到北均有分布,已知32种。本文记述了10新种和1新记录种,模式标本保存于北京农业大学昆虫标本室。     

陕西省毛蚊的新种和新记录(双翅目:毛蚊科)

最近我们在整理陕西省森林昆虫普查采集的毛蚊标本及我们标本室收藏的陕西省毛蚊标本时,鉴定出14个新种和1个新记录亚种,现记述如下。1、棒足叉毛蚊Penthetria clavata,新种(图1 a-e)     

白垩纪中期克钦琥珀毛蚊科(双翅目:毛蚊总科)昆虫一新属新种

毛蚊科是双翅目长角亚目的一类昆虫,其种类丰富,广布世界各地.毛蚊化石记录较为丰富,但往往都是保存于湖相沉积地层中,琥珀中的化石较为罕见.本文根据缅甸北部克钦地区产出的白垩纪中期琥珀中保存的昆虫标本建立了 1新属新种——缅甸白垩叉毛蚊(Cretpenthetria burmensis gen.et sp.nov.),归入...     

云南蚊科三新种 （双翅目：蚊科）

记述了采自云南蚊科3新种,即：蓝带蚊属伪费蚊亚属一新种瞿氏蓝带蚊Uranotaenia (Pseudoficalbia) qui Dong, Dong et Zhou, sp. Nov.,采自西双版纳优乐山竹穴积水中,与新糊蓝带蚊Ur. Novobscura Barraud和二斑蓝带蚊Ur. Bimaculata Leicester近缘;领蚊属一新种类孟连领蚊Heizmannia (Heizmannia) menglianeroides Dong, Dong et Zhou, sp. Nov.,采自云南省景洪县森林竹筒积水中,与孟连领蚊Hz. Menglianensis Lu et Gong, 1986为近缘;库蚊属泰蚊亚属一新种陈氏库蚊Culex (Thaiomyia) cheniDong, Wang et Lu, sp. Nov.,采自云南西北部海拔1795 m的腾冲县竹筒积水,与海南库蚊Cu. (Th.) hainaensis Chen, 1977近缘。讨论了各新种与近缘种的鉴别特征。新种分别存放在云南省疟疾防治研究所和贵阳医学院微生物教研室。     

中新世毛蚊科新种——兼论Clothonopsis miocenica的分类位置

记述我国山东山旺中新统山旺组双翅目毛蚊科Plecia属3新种和Bibio属1新种.根据现代毛蚊类的生态学知识推断了中新世山旺地区的古生态特征.同时,讨论了Clothonopsis miocenica的基本特征以及分类描述中存在的问题,认为不能把这个种置于纺足目,应归入双翅目的毛蚊科.     

中国蚊科新记录

在整理蚁科标本中,发现有两种系国内新记录,兹记述如下。1.侧扁蚁Camponotus compressus Fabr. ♀体长11毫米。暗黑色,具极精致与密集的网状刻点,上颚、触角鞭节及足为栗褐色或红色,少有黑色的,短柔毛稀疏、直立,头部与胸部常少毛。梗节与柄后腹的基部有时有光泽,腹节每节后缘为狭的褐黄色。 头呈三角形,前部极宽,后头角凸出;触角柄节圆筒形;复眼较小,位额的稍侧面;上颚有7个齿;唇基顶的中央具隆线,矩形的前部的中央部分伸出一叶。胸部比头窄,前面伸出一颈;足长,胫节狭直为棱桂形;梗节的结卵形,横切,前面凸出,后面扁平。腹部较宽阔粗大。     

河南省伏牛山毛蚊科三新种：双翅目：长角亚目

本文对河南省新记录的毛蚊科Ｂｉｂｉｏｎｉｄａｅ昆虫作了简述,记述了发现于伏牛山自然保护区的毛蚊属Ｂｉｂｉｏ３新种,即：豫毛蚊Ｂ．ｙｔｕａｎｕｓ ,ｓｐ．ｎｏｖ。伏牛毛蚊Ｂ．ｆｕｎｉｕａｎｕｓ,ｓｐ．ｎｏｖ．和长须毛蚊Ｂ．ｌｏｎｇｉｐａｌｐｕｓ,ｓｐ。ｎｏｖ。新种模式标本存中国农业大学昆虫标本馆。     

毛蚊科九新种记述：双翅目：长角亚目

本文记述了双翅目毛蚊科3属9新种,其中棘毛蚊属3种:长喙棘毛蚊 Ditophus macrosiphonius sp.nov.,吉林棘毛蚊 D.jilinensis sp.nov.和膜棘毛蚊 D.membranaceus sp.nov.;叉毛蚊属2种:异角叉毛蚊 Penthetria aberrans sp.nov.和甘肃叉毛蚊 P.gansuensis sp.nov.;襀毛蚊属4种:裂襀毛蚁 Plecia dilacerabilis sp.nov.,峨眉襀毛蚊 P.emeiensis sp.nov.,钳襀毛蚊 P.forcipiformis sp.nov.和长叶襀毛蚊 P.longifolia sp.nov.。所有模式标本均保存在北京农业大学昆虫标本室。     

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.