期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
地方品种鸡ev21基因和JS序列分布对鸡羽速表型的影响 被引量:2
1
作者 付华丽 莫国东 +2 位作者 伍子放 王归燕 张细权 《中国家禽》 北大核心 2021年第3期11-15,共5页
试验旨在探究多个地方品种快慢羽鸡的内源性病毒基因21(ev21)以及SPEF2基因与PRLR基因的部分重复序列(JS序列)分布对羽速基因(Kk)表型的影响。采用PCR扩增、HaeⅢ限制性内切酶酶切的方法检测不同地方品种快慢羽鸡性染色体上OR区域(ev21... 试验旨在探究多个地方品种快慢羽鸡的内源性病毒基因21(ev21)以及SPEF2基因与PRLR基因的部分重复序列(JS序列)分布对羽速基因(Kk)表型的影响。采用PCR扩增、HaeⅢ限制性内切酶酶切的方法检测不同地方品种快慢羽鸡性染色体上OR区域(ev21占据片段)、UR区域(URa、URb(ev21未占据片段))以及JS序列分布情况。结果表明:国内的一些地方品种部分慢羽鸡个体OR区域ev21基因缺失以及部分快羽鸡的URb区域存在ev21基因插入;可通过JS序列扩增对快慢羽表型进行准确鉴定。研究结果显示JS序列可作为快慢羽鉴定候选基因,该方法可广泛应用于国内快慢羽鸡种的鉴定。 展开更多
关键词 快慢羽 ev21基因 OR区域 ur区域 JS序列
下载PDF
Identification and analysis of underdeveloped resource-rich regions in China 被引量:1
2
作者 Zhong Saixiang Xie Mei'e Gu Shuzhong 《Ecological Economy》 2007年第2期132-148,共17页
This paper analyzes the existence of developmental views and compares the results of previous studies for underdeveloped regions. In view of the limitations of previous studies, this study details regional unit, expan... This paper analyzes the existence of developmental views and compares the results of previous studies for underdeveloped regions. In view of the limitations of previous studies, this study details regional unit, expands index system, applies factor-analysis to structure index system, uses the fuzzy comprehensive evaluation model to improve analytic hierarchy process, and identifies the economic developmental levels of 384 regions, including 4 municipalities, 333 cities at prefecture level, and 47 counties under the jurisdiction of province. The levels of the 47 counties are identified by dividing the rank of comprehensive values of more than 337 regions unit into five equal graduations and then matching the 47 counties with the five-graduation results. This study provides the distribution of resources-rich region in China qualitatively and quantitatively in terms of coal, oil gas and other 14 kinds of metal mineral resources. Finally, by matching the two parts of results, this study identifies the distribution of underdeveloped resource-rich regions (URRRs). URRRs are mainly distributed in Shaanxi, Shanxi, Guizhou, Yunnan, Sichuan, He’nan, Shandong, Guangxi and Gansu provinces, which accounts for 78.57% of the total in China. To a certain degree, the result of this paper proves that “resources curse” existing in the national stratification plane in later 20th century still takes places in some cities in China, especially in the counties of these cities’ jurisdiction. 展开更多
关键词 Underdeveloped region ur Resource-rich region (RRR) Underdeveloped resource-rich region urRR) Resource curse
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部