不同连锁群上多基因杂交及回交世代方差分量的分解

若控制某一数量性状的多基因分散于Ｍ个连锁群，每个连锁群上有Ｋｍ个多基因。当两纯系（Ｐ１和Ｐ２）存在Σ↑Ｍ↓ｍ＝１Ｋｍ对基因差异，Ｐ１中有Σ↑Ｍ↓ｍ＝１（Ｋｍ＝Ｋ＇ｍ）个显性纯合位点及Σ↑Ｍ↓ｍ＝１Ｋ＇ｍ个隐性纯合位点，Ｐ２中相应有Σ↑Ｍ↓ｍ＝１（Ｋｍ－Ｋ＇ｍ）个隐性纯合位点及Σ↑Ｍ↓ｍ＝１Ｋ＇ｍ个显性纯合位点。其中Σ↑Ｍ↓ｍ＝１（Ｋｍ－Ｋ＇ｍ）个基因座中有Σ↑Ｍ↓ｍ＝１Ｎｍ个基因显性方向为负，Σ↑     

Physical location of terminal markers belonging to five linkage groups in maize RFLP map using in situ hybridization

Ten terminal or subterminal RFLP markers belonging to linkage groups 1, 3, 5, 6, and 10 in maize RFLP map were physically locted onto maize mitotic chromosomes with in situ hybridization. All biotinylated probes from 600 to 2 250 bp were detected by DAB staining. The markers belonging to linkage groups 1, 3, 5, 6, and 10 correspondingly located at the chromosomes 1, 3, 5, 6, and 10. All of the tested markers except bnl6.25 and umc44 were duplicated sequences. Each of them was also labeled on another chromosome besides on the chromosome corresponding to its linkage group. The marker bnl3. 04 was triplicated sequences and the signals were detected on three nonhomologous chromosomes. In the tested ten markers, there were only four located at the ends of corresponding chromosomes. Others were located at sites midway along the chromosome arms or near the centromeres. The region covered by two terminal or subterminal markers in each of linkage groups 1, 3, 5, and 6 occupied 80.02%, 38.25%, 82.30% and 51.16% of the region of both short and long arms in chromosomes 1, 3, 5, and 6 respectively. Only two terminal markers of linkage group 10 covered the whole chromosome 10. In some linkage groups, two terminal or subterminal markers covered a short genetic distance but were physically distant, while two covering a longer genetic distance were physically closer. Supported by The National Natural Science Foundation of China and the Doctorate Vesting Point Foundation of the Education Committec of the People's Republic of China Mao Ninghui: born in 1986, used to be an MS student of Wuhan University in 1992–1995 and now is working in Fudan University, Shanghai 200433     

茶马古道与百越古道

文章论述了茶马古道的由来和研究现状,论述了茶马古道和百越古道的区别,对百越古道的研究进行了回顾和前瞻。     

道路交通肇事逃逸事故对策

本文探讨了我国交通肇事逃逸事故的特点及其原因,进而提出了交通肇事逃逸的预防策略。     

双因素理论与安全事故预防

为了更科学地预防安全事故的发生,通过对安全事故成因的分析,提出实现安全的两个因素：保障因素和保证因素。保障因素是指导致大多数事故的主要因素,即人因,人因是能够确实保障系统安全的内在因素：保证因素是指导致事故的物的因素,即物因,物因是实现安全的物理条件。认为事故的主要原因在于人因,预防和控制事故的根本途径在于通过有效的组织文化的实施,彻底解决个人和组织的不安全行为,才能杜绝事故的发生,并以杜邦公司的实例证实了该结论的正确性。     

培田古民居与徽派古民居的相似性

从建筑的结构格局、风格特色、文化意蕴上都可看出福建闽西培田古民居与徽派古民居有着极高的相似性。依据民居形成的先后及地缘环境文化的相似可知培田古民居在营造过程中对徽派建筑有着明显的传承与借鉴,二者共同体现出对中原文化的认同与追求,对当今构建和谐的人居环境仍有着极强的借鉴价值和启发意义。     

深埋冻结壁变形特性的理论分析及数值模拟

考虑冻土流变、冻结壁卸载状态、冻结壁与周围土层共同作用等因素,建立了冻结壁变形的解析解。针对同一工程实例,分别采用理论分析与数值模拟两种方法,深入分析了深埋冻结壁的变形特性,计算结果与现场实测结果基本一致,较好地反映了实际情况。     

图书馆古籍的收藏和服务

简要分析了古籍收藏的现状,结合古籍收藏和服务的需求,探讨了图书馆在古籍收藏和古籍服务两方面应采取的措施。     

区域公路交通事故及高速公路交通事故特征

基于中国公路交通事故统计和当前交通安全面临的严峻形势，应用理论分析和统计对比的方法，从宏观角度分析了GDP、交通量和公路里程在不同区域对公路交通事故的影响，并有针对性地分析高速公路交通事故。认为高速公路交通事故具有重特大事故比率较高、尾随相撞事故比例大、受气候因素影响大、驾驶员和车辆性能是事故主要原因等基本特征。该研究结果可为制定公路交通事故预防对策提供理论依据。