Foxtail millet is not only a very useful experimental crop, but also a fodder crop and a staple food of people who live on the marginal agricultural lands, and it supplies high-quality protein for food products and in...Foxtail millet is not only a very useful experimental crop, but also a fodder crop and a staple food of people who live on the marginal agricultural lands, and it supplies high-quality protein for food products and industrial materials. However, leaf rust greatly reduces foxtail millet yields in susceptible varieties when weather conditions favor rust spread and development. Therefore, it is necessary to use molecular markers detecting and marking resistance genes. Compared with other molecular markers, AFLP maker is more efficient and powerful in the study of foxtail millet. In this study, AFLP analysis of 131 F2 individuals was performed and three AFLP makers were found to be linked to the rust resistance gene, with the genetic distances of 9.2, 9.8 and 12.4 cM, respectively. Cloning of rust re- sistance genes is of great importance and meaning in studying rust resistance of foxtail millet in the future. Furthermore, we may convert specific AFLP markers into single locus PCR markers, such as sequence characterised amplified region （SCAR） markers or cleaved amplified polymorphic site （CAPS） markers.展开更多
In this study, a number of typical precursory anomalies recorded by stations in Qinghai, Gansu, Sichuan, Xinjiang, Ningxia, Hebei and Shaanxi provinces and autonomous regions before the M_S8.1 earthquake in the west o...In this study, a number of typical precursory anomalies recorded by stations in Qinghai, Gansu, Sichuan, Xinjiang, Ningxia, Hebei and Shaanxi provinces and autonomous regions before the M_S8.1 earthquake in the west of Kunlun Mountains Pass are collected and checked. According to the standards of earthquake cases in China, the criteria of the precursory anomalies are determined, and 53 distinguished. The characteristics of these anomalies before the M_S8.1 earthquake are analyzed, with results showing a very large earthquake affected area. The precursory anomalies recorded by instruments were 2900 km away from the epicenter, and according to the study in this paper, reached 2100 km away. The results also show that the anomalies present characteristics of long duration, multi-measurement items and large-amplitude variation. The authors believe that in large earthquake monitoring, attention should be paid to the variation of data over a large area, ranging up to thousands kilometers, with much denser earthquake observation networks.展开更多
On February 11,1954,an earthquake with M_S7.3 occurred in Shandan county of Hexi corridor,West China.It was the first great earthquake in northwest China after 1949.The earthquake left 47 people dead,332 people injure...On February 11,1954,an earthquake with M_S7.3 occurred in Shandan county of Hexi corridor,West China.It was the first great earthquake in northwest China after 1949.The earthquake left 47 people dead,332 people injured and tens of thousands of people homeless;nearly 7277 buildings were damaged or collapsed and the property loss was more than one billion Yuan(RMB)at a rough estimate.In the meizoseismal area,the intensity was Ⅺ,the Hongsihu basin and Shandan County was the most serious damage,and in Shandan,the earthquake-stricken area was 4800 km2.In the paper,a brief introduction is presented to the Shandan earthquake,including the basic parameters,distribution of seismic intensity and natural environment.The characteristics of building destruction are particularly discussed,the earthquake disaster distribution features and economic loss evaluation are also analysed.Finally,causes of the earthquake damage,experiences and lessons as well as implications of protection against earthquake and disaster reduction are summed up.展开更多
基金Supported by National Natural Science Foundation of China(31271787,31101163)Natural Science Foundation of Hebei Province(C2013301037,C2014301028)
文摘Foxtail millet is not only a very useful experimental crop, but also a fodder crop and a staple food of people who live on the marginal agricultural lands, and it supplies high-quality protein for food products and industrial materials. However, leaf rust greatly reduces foxtail millet yields in susceptible varieties when weather conditions favor rust spread and development. Therefore, it is necessary to use molecular markers detecting and marking resistance genes. Compared with other molecular markers, AFLP maker is more efficient and powerful in the study of foxtail millet. In this study, AFLP analysis of 131 F2 individuals was performed and three AFLP makers were found to be linked to the rust resistance gene, with the genetic distances of 9.2, 9.8 and 12.4 cM, respectively. Cloning of rust re- sistance genes is of great importance and meaning in studying rust resistance of foxtail millet in the future. Furthermore, we may convert specific AFLP markers into single locus PCR markers, such as sequence characterised amplified region （SCAR） markers or cleaved amplified polymorphic site （CAPS） markers.
基金funded by National Joint Foundation of Earthquake of China under Grant No.106086
文摘In this study, a number of typical precursory anomalies recorded by stations in Qinghai, Gansu, Sichuan, Xinjiang, Ningxia, Hebei and Shaanxi provinces and autonomous regions before the M_S8.1 earthquake in the west of Kunlun Mountains Pass are collected and checked. According to the standards of earthquake cases in China, the criteria of the precursory anomalies are determined, and 53 distinguished. The characteristics of these anomalies before the M_S8.1 earthquake are analyzed, with results showing a very large earthquake affected area. The precursory anomalies recorded by instruments were 2900 km away from the epicenter, and according to the study in this paper, reached 2100 km away. The results also show that the anomalies present characteristics of long duration, multi-measurement items and large-amplitude variation. The authors believe that in large earthquake monitoring, attention should be paid to the variation of data over a large area, ranging up to thousands kilometers, with much denser earthquake observation networks.
基金This research was funded by the Joint Earthquake Science Foundation of China with Grant No.197025,504004 and 106086Contributions number: LC20070033 of the Lanzhou Institute of Seismology,CEA
文摘On February 11,1954,an earthquake with M_S7.3 occurred in Shandan county of Hexi corridor,West China.It was the first great earthquake in northwest China after 1949.The earthquake left 47 people dead,332 people injured and tens of thousands of people homeless;nearly 7277 buildings were damaged or collapsed and the property loss was more than one billion Yuan(RMB)at a rough estimate.In the meizoseismal area,the intensity was Ⅺ,the Hongsihu basin and Shandan County was the most serious damage,and in Shandan,the earthquake-stricken area was 4800 km2.In the paper,a brief introduction is presented to the Shandan earthquake,including the basic parameters,distribution of seismic intensity and natural environment.The characteristics of building destruction are particularly discussed,the earthquake disaster distribution features and economic loss evaluation are also analysed.Finally,causes of the earthquake damage,experiences and lessons as well as implications of protection against earthquake and disaster reduction are summed up.
