Mapping chromosomal homologies between humans and two langurs (Semnopithecus francoisi and S-Phayrei) by chromosome painting

Chromosomal homologies were established between human and two Chinese langurs (Semnopithecus francoisi, 2n=44, and S. phayrei, 2n=44) by chromosome painting with chromosome-specific DNA probes of all human chromosomes except the Y. Both langur species showed identical hybridization patterns in addition to similar G-banding patterns. In total, 23 human chromosome-specific probes detected 30 homologous chromosome segments in a haploid langur genome. Except for human chromosomes 1, 2, 6, 16 and 19 probes, which each gave signals on two non-homologous langur chromosomes respectively, all other probes each hybridized to a single chromosome. The results indicate a high degree of conservation of chromosomal synteny between human and these two Chinese langurs. The human chromosome 2 probe painted the entire euchromatic regions of langur chromosomes 14 and 19. Human chromosome 1 probe hybridized to three regions on langur autosomes, one region on langur chromosome 4 and two regions on langur chromosome 5. Human 19 probe hybridized on the same pattern to one region on chromosome 4 and to two regions on langur chromosome 5, where it alternated with the human chromosome 1 probe. Human 6 and 16 probes both hybridized to one region on each of the two langur autosomes 15 and 18. Only two langur chromosomes (12 and 21) were each labelled by probes specific for two whole human chromosomes (14 and 15 and 21 and 22 respectively). Comparison of the hybridization patterns of human painting probes on these two langurs with the data on other Old World primates suggests that reciprocal and Robertsonian translocations as will as inversions could have occurred since the divergance of human and the langurs from a common ancestor. This comparison also indicates that Asian colobines are karyotypically more closely related to each other that to African colobines.

六种鱼巴亚科鱼类线粒体细胞色素b 基因序列分析

测定了鱼巴亚科云南光唇鱼( Acrossocheilus yunnanensis) 、宽头四须鱼巴( Barbodes laticeps) 、抚仙金线鱼巴 ( Sinocyclocheilus tingi) 和滇池金线鱼巴( Sinocyclocheilus grahami) 4 种鱼类线粒体细胞色素b 基因DNA 序列402 bp ,结合已知的云南倒刺鱼巴( S pinibarb denticulatus yunnanensis) 和细尾长臀鱼巴( Mystacoleucus lepturus) 的同源 序列,组成1 个6 种代表鱼巴亚科5 属鱼类的数据集. 选用已知的云南鲴( Xenocypris yunnanensis) 作为外群,采用 邻接法、最大简约法和最大似然法构建了分子系统树. 结果显示: 倒刺鱼巴属( S pinibarbus) 和光唇鱼属 ( Acrossocheilus) 有较近的亲缘关系,四须鱼巴属( Barbodes) 和长臀鱼巴属( Mystacoleucus) 有较近的亲缘关系,而金 线鱼巴属( Sinocyclocheilus) 和它们的关系不能确定. 上述结果与它们的地理分布基本吻合.

Analysis of 18S rRNA gene of Octostigma sinensis (Projapygoidea : Octostigmatidae) supports the monophyly of Diplura

The phylogenetic position of Diplura within Hexapoda has been controversial. There are three major lineages in Diplura: Campodeoidea, Projapygoidea, and Japygoidea. However, most of the previous studies were restricted to Campodeoidea and Japygoidea. Unti

澜沧江短吻鱼属鱼类

短吻鱼属Sikukia隶属于鲤科ba亚科(Cyprinidae: Barbinae),分布于澜沧江-湄公河流域。已知本属鱼类有4种,仅分布于中国西南部澜沧江下游的有S. flavicaudata和S. longibarbata; S. stejnegeri只见于泰国湄公河;S. gudgeri为中国和泰国共有种。长须短吻鱼,新种S. longibarbata sp. nov.。

滇池典型区域磷与铁的形态分布规律

通过调查滇池三个湖湾不同深度水层磷与铁的形态分布,研究三个湖湾内源磷的释放规律.结果表明,在海埂湾间隙水中,磷的释放强度远高于另外两个湖湾,根据水体中各种形态磷和铁的关系,推测出在这三个湖湾中,铁结合态磷是湖水悬浮物和沉积物中一种重要的可释放磷.

我国早期的一篇淡水藻类分类学论文及其作者

在国立武昌高等师范学校编辑出版的《博物学会杂志》第一卷到第四卷 (共 4期 )上刊载的毕祖高撰写的“武昌长湖之藻类”一文是迄今所知由中国科学家研究中国标本所正式发表的淡水藻类分类学的第一篇论文 .此篇论文的发表 ,标志着中国淡水藻类的采集、调查研究和发表完全由中国人己独立承担任务并取得成绩的开始 .毕祖高是国立武昌高师博物部 1917年的毕业生 ,发表此文时 ,他是国立武昌高师附属中学的博物学教员 .

中国真缓步纲三新种及六新纪录种记述(近爪目:大生熊虫科,高生熊虫科)

记述了大生熊虫科大生熊虫属Macrobiotus一新种和三新纪录种,即神农大生熊虫,新种M.shennongensissp.nov.、桃形大生熊虫M.persimilisBinda&Pilato,1972,卷形大生熊虫M.rolleiHeinis,1921,陆栖大生熊虫M.terricolaMihelcic,1949以及趾生熊虫属一新种,即水生趾生熊虫,新种Dactylobiotusaquatilissp.nov.;高生熊虫科等高熊虫属Isohypsibius一新种和二新纪录种,即长白等高熊虫,Is.ch

草鱼出血病病毒的研究进展

根据80－90年代中国关于草鱼出血病病毒研究的进展，就草鱼出血病病毒的发现、形态结构特征、理化特性、基因组结构及其所编码的多肽、基因组的转录和翻译过程，病毒的繁殖动态、体外细胞培养特性，病毒对鱼体的致病机理和宿主范围，草鱼出血病的诊断和防治等问题进行综合评述，总结概括了草鱼出血病病毒的研究现状以及研究中需要亟待解决的问题，并提出该领域以后的重点研究方向。

池养鲤和草鱼血液学指标的研究

1.鲤鱼和草鱼的血液细胞包含红血球、淋巴球、单核球、嗜中性球、嗜酸性球及纺锤细胞。没有见到嗜碱性球。2.鲤鱼及草鱼的红血球数及血红蛋白量,在正常条件下,与水中溶氧量及成熟系数成十分显著的负相关。成熟雌鲤的红血球数(y)与溶氧量(x1)及成熟系数(x2)的迥归公式为:y=122+2.9x1-1.2x2。3.性腺发育程度及生殖活动强烈地影响鱼类血液有形成分。在生殖季节雄鱼的红血球数及血红蛋白量比雌鱼高,红血球沉降率则相反。白血球则在生殖季节及性腺退化吸收时比较活跃,而在非生殖季节两性之间无明显差异。4.发育成

Phytoremediation of triazophos by Canna indica Linn. in a hydroponic system

The phytoremediation of triazophos (O, O-diethyl-O-(1-phenyl-1, 2, 4-triazole-3-base) sulfur phosphate, TAP) by Canna indica Linn. in a hydroponic system was studied. After 21 d of exposure, the removal kinetic constant (K) of TAP was 0.0229-0.0339 d(-1) and the removal percentage of TAP was 41-55% in the plant system and the K and removal percentage of TAP were about 0.002 d(-1) and 1%, respectively, in darkness and disinfected control. However, the K and removal percentage of TAP were 0.006 d(-1) and approximately 11%, respectively, in the treatment with eluate from the media of constructed wetland. The contribution of plant to the remediation of TAP was 74% and C. indica played the most important role in the hydroponic system. Under the stress of TAP and without inorganic phosphorus nutrient, the activity of phosphatase in the plant system increased and phytodegradation was observed. The production and release of phosphatase is seen as the key mechanism for C. indica to degrade TAP. C. indica, which showed the potential of phytoremediation of TAP, and is commonly used in constructed wetland, so the technique of phytoremediation of TAP from contaminated water can be developed with the combination of constructed wetland.