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The c-myc coding DNA sequences of cyprinids (Teleostei: Cypriniformes): Implications for phylogeny 总被引:1,自引:0,他引:1
KONG XiangHui WANG XuZhen GAN XiaoNi HE ShunPing 《科学通报(英文版)》2007,52(11):1491-1500
The family Cyprinidae is one of the largest fish families in the world, which is widely distributed in East Asian, with obvious difference in characteristic size among species. The phylogeneUc analysis of cyprinid taxa based on the functionally important genes can help to understand the speciation and functional divergence of the Cyprinidae. The c-myc gene is an important gene regulating individual growth. In the present study, the sequence variations of the cyprinid c-myc gene and their phylogenetic significance were analyzed. The 41 complete sequences of the c-myc gene were obtained from cyprinids and outgroups through PCR amplification and clone. The coding DNA sequences of the c-myc gene were used to infer molecular phylogenetic relationships within the Cyprinidae. Myxocyprinus asiaticus (Catostomidae), Misgurnus anguillicaudatus (CobiUdae) and Hemimyzon sinensis (Homalopteridae) were assigned to the outgroup taxa. Phylogenetic analyses using maximum parsimony (MP), maximum likelihood (ML), and Bayesian retrieved similar topology. Within the Cyprinidae, Leuciscini and Barbini formed the monophyletic lineage respectively with high nodal supports. Leuciscini comprises Xenocyprinae, CuItrinae, East Asian species of Leuciscinae and Danioninae, Gobioninae and Acheilognathinae, and Barbini contains Schizothoracinae, Barbinae, Cyprininae and Labeoninae. Danio rerio, D. myersi and Rasbora trilineata were supposed to separate from Leuciscinae and Barbini and to form another lineage. The positions of some Danioninae species were still unresolved. Analyses of both amino acid variation with parsimony information and two high variation regions indicated that there is no correlation between variations of single amino acid or high variation regions and characteristic size of cyprinids. In addition, the species with smaller size were usually found to be basal within clades in the tree, which might be the results of the adaptation to the primitive ecology and survival pressure. 相似文献
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很大程度上说,人类历史是一部人类与瘟疫之间的斗争史。在疫情面前,最无助和脆弱的当属社会边缘胙体。罗姆人是欧洲最大的少数民族,也是长期被排斥在主流社会外的欧洲公民群体。世界各地对罗姆人的称呼不尽相同,他们还被称为吉普赛人、茨冈人、波希米亚人、辛提人和阿什卡人。有研究表明,罗姆人属干印欧语系的白人种族,原生活于印度拉贾斯坦邦,中肚纪后逐渐向欧洲迁徙。 相似文献
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韩晶 《长春师范学院学报》2007,(9)
法语外来语使英语词汇量陡增,在极大地丰富了英语表达能力的同时,也增加了英语的学习难度;使英语语法摒弃了屈折形式,由综合性语言变成了分析性语言,以词序和虚词表达语法关系。 相似文献
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法语作为二外,在各高校英语专业中被越来越多的学生选修。然而由于其与英语的特殊关系,在学习过程中,往往会受到来自英语方面的干扰。本通过两种语言的相似与不同的比较,为正确掌握法语提供了一个值得借鉴的方法。 相似文献
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那木吉拉 《中央民族学院学报》2003,30(3):94-98
在阿尔泰语系赫哲、蒙古和柯尔克孜等民族中,民间流传着母题情节基本相同的月亮斑痕神话,其中的诅咒语言巫术以及月亮攫去小女孩或小媳妇的母题来源相当古老。上述诸民族月亮斑痕神话是在这些原始的语言信仰习俗和神话观念的基础上产生并发展演进的。 相似文献
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穿越遥远的岁月,倾听亡灵的声音,这是古文字破译领域面临的巨大挑战。埃及象形文字于1823年得到破译,不但将历史记载的跨度拓展了约2000年,还使我们得以阅读到"拉美西斯大帝"的传闻;玛雅象形文字则表明"新大陆"在罗马帝国时代拥有一种崇尚精致、追求风雅的文明……而本文提及的八种未知文字大多已得到局部破译,一些研究权威宣称对其中好些难题已有更充分的了解,这些未知领域也可望取得更大的进展,尤其是如果有新铭文被发现的话,而这类幸运之事近年来似乎非常频繁。 相似文献
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台湾民族文化的源流初探 总被引:1,自引:0,他引:1
段宝林 《厦门理工学院学报》2012,(1):1-8
从台湾文化最初的源头开始,以大量的事实证明,台湾最早的居民是由东山陆桥到台湾的古越人。台湾原住民的民族文化就是古越人的文化,这在台湾考古文物和民俗文化中都得到了充分的证据。对于认为台湾原住民文化来自南岛的观点,也进行了分析,指出南岛文化的历史远比台湾雅美人等原住民的历史为短。台湾原住民的语言和文化,同大洋洲波利尼西亚居民的语言和文化有相似之处,是由于他们都是古越人的后裔,台湾也可能是古越人去南岛的中间站。当然,台湾有些民族是从南岛迁徙回来的,那已经是很晚的事情。故而台湾最原始的文化源头是在祖国大陆,这是众多人类学家、历史学家、考古学家、民俗学家、文化学家们公认的事实。 相似文献