河南董寨发现中华仙鹟

河南董寨国家级自然保护区位于河南省南部的罗山县境内(114°18′～114°30′ E,31°28′～32°09′ N),2019年5月12日上午,保护区鸟类环志站技术人员在七里冲保护站进行鸟类环志时,捕获1只小型鸟类,捕获地生境为荒废农田边的灌丛林(114°14′25″E,31°02′40″N,海拔125m).该鸟整...     

云南鸟类新纪录——长脚秧鸡

2011年10月15日夜间,云南省南涧县凤凰山鸟类环志站(地理坐标24°53’57.65″N,100°19’47.98″E)的环志工作人员用粘网通过灯光诱捕到一只鹤形目Gruiformes秧鸡科Rallidae鸟类——长脚秧鸡Crexcrex,身体测量值为喙长20mm,翅长140mm,体长255mm,尾长49mm,跗蹠42mm。     

河南发现叽喳柳莺

2006年12月23日下午4时许,在河南董寨国家级自然保护区七里冲保护站(114°17'E,32°06'N)进行鸟类环志时,捕获到一只小型莺类.     

嫩江高峰林区白腰朱顶雀的环志回收

高峰鸟类保护环志站地处大、小兴安岭之间的嫩江河谷东岸,松嫩平原北麓。特殊的地理位置使这里成为候鸟经松嫩平原迁徙途中重要的停歇地和食物补给站。自1998年开展环志以来,截止2005年12月末,在该地区发现鸟类210种,隶属15目36科,环志鸟类163种163305只,其中,白腰朱顶雀(Carduelis flammea)环志26157只,是高峰鸟类保护环志站环志数量最多的种类。2003年2月10日挪威回收到由高峰鸟类保护环志站环志的一只白腰朱顶雀,成为中国开展鸟类环志20多年来,欧洲国家回收到的第一只中国环志鸟。之后,在俄罗斯、荷兰也相继回收到高峰环志的鸟类,使高峰鸟类保护环志工作再度引起鸟类学家的关注。     

黑龙江省鸟类新纪录——黄腹柳莺

2010年8月24日6∶40,在黑龙江省高峰鸟类保护环志站3号环志点(49°05′39″N,125°15′24″E,海拔298 m)捕到1只上体橄榄绿色、下体黄色、贯眼纹黑色、眉纹黄色、趾下鲜黄色的柳莺,经查阅相关文献,鉴定为黄腹柳莺Phylloscopus affinis。该鸟体     

云南鸟类种的新记录——海南(开鸟)

2006年10月28日凌晨3点,笔者在位于云南省新平县哀牢山的金山丫口鸟类环志站进行夜间鸟类环志工作时,用灯光诱捕到一只鹭科鸟类,经鉴定为海南(开鸟) (Gorsachius magnificus),为云南省鸟类物种新记录.     

新疆鸟类环志与回收

2001年8月与14－26日在新疆阿勒泰,吐鲁番的8个环志地点进行了秋际鸟类环志工作。环志鸟类233只,约33种,多以莺亚科（Sylviinae)和鸫亚科（Turdinae)的种类为主。其中的新疆歌鸲（Luscinia sp.)等17种鸟类均属于中国首次环志种类,占环志种数的53％。     

中国鸟类新记录——白腹针尾绿鸠

2020年10月10日6:40时,在云南省大理州无量山国家级自然保护区南涧管护局凤凰山鸟类环志站环志点(100°19′47″E,24°53′58"N,海拔2360m)网捕到1只鸠鸽.该鸠鸽体型、形态与针尾绿鸠(Treron apicauda)雄鸟相似,但颈背部羽毛为灰绿色,翼上腕部具紫红色小斑块,腹部白色,尾下覆羽鲜黄...     

黑龙江省鸟类新纪录——田鸫

2010年10月23日16:30,环志人员在地处黑龙江省大兴安岭地区伊勒呼里山南麓的南瓮河国家级自然保护区青林鸟类环志站(51°08’19.9″N,125°08’36.6″E)环志到一只鸫。该鸟头顶、颈、腰淡灰蓝色,额、头顶有少许黑色纵纹,背栗褐色,翅和尾黑褐色,眉纹白色,嘴橙黄色,尖端黑色,下体白色,喉、胸锈黄色具黑褐色纵纹,两胁鳞状斑,跗蹠褐色;体重93.2g,体长270     

秦皇岛黄胸鹀和蓝歌鸲的种群动态及迁徙时序——基于1999-2019年的环志数据

鸟类环志是种群监测和迁徙研究的重要手段.基于秦皇岛鸟类环志站1999～2019年的环志数据,对黄胸鹀(Emberiza aureola)和蓝歌鸲(Larvivora cyane)两种鸟类在21年间的种群动态和迁徙时序进行了分析.结果表明,迁徙途经秦皇岛的黄胸鹀种群数量以4或5年为周期呈规律性的波动下降,年均降幅达17....     

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.