海南岛海水鱼类单殖吸虫研究及宽海盘虫二新种记述

记述了采自海南岛后水湾的眶棘双边鱼Ambassis gymnocephalus Lacépéde鳃上寄生的宽海盘虫2新种.张氏宽海盘虫Euryhaliotrema zhangjianyingi sp nov.以其边缘小钩明显长于两对中央大钩,支持器的套环状特殊结构,两对中央大钩和联结片而不同于属内的已知种;双边鱼宽海盘虫,Euryhaliotrema ambassisi sp.nov.以其交接器的量度,后吸器中央大钩内突基部较宽,外突较小,钩基部较直,钩尖短而不同于相似种和属内已知种.文中量度μm,模式标本保存在海南师范学院生物系.     

海南岛海水鱼类寄生海盘虫属一新种及两新纪录(单殖亚纲,锚首虫科)

首次报道了南海镰鱼Zandus cormdus（Linbacus）（采自海南岛三亚市）鳃上寄生单殖吸虫,锚首虫科Anctyrocephalidae Bychowsky ＆ Nagibina 1978,海盘虫属Haliotrema Johnston ＆ Tiegs,1922中的1新种及2新纪录种。而且,镰鱼为管阴海盘虫H．tubulovagina Yamaguti,1968和丹姆斯特海盘虫H．dempsteri（Mizele ＆ Price,1964）Young,1968的宿主新记录。文中量度微米（μm）,模式标本保存于湖南文理学院生命科学系。镰茎海盘虫,新种Haliotrema sichlocirrus sp.nov（图1～5） 宿主：镰鱼Zandus cormudus（Linnacus）。 寄生部位：鳃丝。海南三亚,2004-03—16。 比较小型的锚首虫,虫体长337～405,宽67～80。背中央大钩全长35～37,钩基长29—31,钩尖长7～10,内突长11～14,外突长4～5;腹中央大钩全长35～37,钩基长30～33,钩尖长9～12,内突长8～10,外突长3～5。背联结片中部较平直,亚中部向前稍隆起,两端向后微弯,大小（5～6）×（60～66）;腹联结片呈弧形弯曲,两端较中部宽阔,大小（6～8）×（55～63）。交接器由阴茎、基座和支持器组成。阴茎呈短管状、较直,管长19～22,基径7～11;基部有一钟形基座,高10～13,底径10～13;支持器长45～53（据弯度）,基端呈细条状,宽约2,近基端弯折,远端一侧呈膜状增宽,似镰刀状。阴道弯管状,长30～35;受精囊大小25×15。 新种在后吸器和交接器的形态构造上与寄生于两种蝴蝶鱼Chaetodon miliaris（模式宿主）、C．multicinctus的杯阴海盘虫H．scyphovagina Yamzguti,1968近似。但二者的支持器不同,已知种的支持器为一鞭状细丝,新种则为一较长而弯折的细条状,且远端一侧呈膜状增宽,似镰刀状。     

海水鱼类单殖吸虫鳞盘虫属一新种描述(指环虫目,鳞盘虫科)

报告采自长尾大眼鲷Priacanthus tayenus Richardson上之鳞盘虫属1新种：粗管鳞盘虫Diplectanum robusti-tubum sp.nov．,它以交接器之结构、后吸器中央大钩及联结片形态之差异而区别于D．curvivagina Yamaguti,1968。     

似杯盘虫属(单殖亚纲,鳞盘虫科)三新种描述

记述了寄生于广东海洋鱼类黄唇裸颊鲷Lethrinus xanthochilus(Klunzinger),弱棘眶棘鲈Scolopsis eriomma(Jordan et Richardson)和金线鱼Nemipterus virgatus(Houttugn)鳃上的似杯盘虫属Calydiscoides Young,1969 3新种,锚形似杯盘虫Calydiscoides ancoratus sp.nov.,强壮似杯盘虫Calydiscoides robustus sp.nov.和深圳似杯盘虫Calydiscoides shenzhenensis sp.nov.,3新种的鳞盘、背腹中央大钩、中央联结片和侧联结片均相似于已知种,但它们的交接器和阴道与已知种不同.     

重庆地区泥鳅体外寄生车轮虫的形态分类学研究

在重庆地区鱼类寄生虫的调查过程中,从淡水鱼泥鳅的鳃上获得四种外寄生车轮虫,经鉴定隶属车轮虫科（Trichodinidae）、车轮虫属（Trichodina）,含1车轮虫未定种Trichodina．sp．和3已知种,即：适度车轮虫（TrichodinamodestaLom,1970）,斜齿车轮虫（Trichodina lechriodentata Zhao＆Tang,2007）及拟黑色车轮虫（TrichodinaparanigraTangetal,2005）。车轮虫的形态学特征统计采用Lom（1958）倡导的统一特定方法,齿体的定位描述则采用Van As＆Basson（1989）和Tang,Zhao＆Chen（2005）改进的方法进行     

四种锚首虫科包括一新种的描述(单殖纲:指环虫目:锚首虫科)

本文报道采自广东阳江闸坡中华海鲶鳃上的锚首虫科四个虫种。包括一新种瘤钩小沙汉虫Chauhanellustuberhamatussp．nov.。它以背中央大钩钩尖基部内侧具瘤状结构而区别于本属已记述的21个种。其余为弯曲小沙汉虫C．flexiosus、海鲶血梗虫Hamatopedunculariaarii、和简单血梗虫H．simplex。     

寄生于重庆地区鲢、鳙及草鱼五种外寄生车轮虫的描述

对采自重庆地区寄生于鲢、鳙及草鱼鳃上的5种外寄生车轮虫进行了形态学及分类学研究,其分别隶属于：车轮虫属、小车轮虫属及三分虫属,其中包含1新种和中国2新纪录。即钝圆车轮虫Trichodina obtusiformis sp．nov．,急尖车轮虫T．acuta Lom,1961,显著车轮虫T．nobilis Chen,1963,周丛小车轮虫Trichodinella epizootica（Rabbe,1950）Sramek-Husek,1953和大型三分虫Tripartiella macrosoma Basson ＆ Van As,1987。文中对新种进行了详细的描述并提供了新种及已知种的附着盘银染标本之显微照片及齿体线条图。     

太阳虫,钟虫和喇叭虫

太阳虫、钟虫和喇叭虫韩志泉（首都师范大学生物系北京１０００３７）自由生活的原生动物已描述的有２万多种,绝大多数属世界性分布。太阳虫、钟虫和喇叭虫就是其中的习见类群。太阳虫（Ａｃｔｉｎｏｐｈｒｙｓ）常见的有放射太阳虫（Ａ．ｓｏｌ）和多泡太阳虫（Ａ．Ｖｅ...     

大亚湾养殖鱼类寄生车轮虫的种类组成与季节动态

2017年8月至2018年7月对大亚湾8种养殖鱼类的车轮虫感染情况进行了调查,采用Lom倡导的"统一特定方法"及Van As&Basson提出的"齿体定位描述法"对采获的车轮虫标本进行了形态鉴定与描述。结果在卵形鲳鲹(Trachinotus ovatus)、星点笛鲷(Lutjanus stellatus)、鞍带石斑鱼(Epinephelus lanceolatus)、眼斑拟石首鱼(Sciaenops ocellatus)和虎龙杂交斑[E. fuscoguttatus (♀)×E. lanceolatus (♂)]等5种鱼上共检获5种车轮虫:亚卓车轮虫(Trichodina jadranica)、莱普斯车轮虫(T. lepsii)、长须鳠车轮虫(T. guliae)、劳牧小车轮虫(Trichodinella lomi)和斜拟车轮虫(Paratrichodina oblique);其中卵形鲳鲹5种虫均有寄生,虎龙杂交斑感染了4种虫,星点笛鲷、眼斑拟石首鱼和鞍带石斑鱼分别感染了3种、2种和1种虫。周年感染数据表明:5种虫的感染率均以卵形鲳鲹最高,眼斑拟石首鱼上2种虫的感染率最低;莱普...     

海水鱼类单殖吸虫研究XI鳞盘虫属二新种

从福建、海南、广东与广西所设的２２个采样点采获鳞盘虫属Ｄｉｐｌｅｃｔａｎｕｍ标本中,又有２种为新种。波茎鳞盘虫,新种Ｄｉｐｌｅｃｔａｎｕｍ ｕｎｄｕｌｉｃｉｒｒｏｓｕｍ ｓｐ．ｍｏｖ与叉片鳞盘虫,新种,Ｄｉｐｌｅｃｔａｎｕｍ ｆｕｒｃｅｌａｍｅｌｌｏｓｕｍ ｓｐ．ｎｏｖ．,它们均以具特殊之交接器结构而区别于本属的其它虫种。     

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.