In this study, identification and rDNA-ITS sequence analysis of an anthracnose pathogen on Dracaena fragrans were carried out. [Method] D. fra-grans leaves with lesions were used as experimental materials to isolate a...In this study, identification and rDNA-ITS sequence analysis of an anthracnose pathogen on Dracaena fragrans were carried out. [Method] D. fra-grans leaves with lesions were used as experimental materials to isolate anthrac-nose pathogen. Morphological observation, rDNA-ITS amplification and sequence analysis were performed to identify the pathogen strain. [Result] Caonidia of the iso-lated anthracnose pathogen were straight or curved, el iptic to crescent, with 2-5 oil droplets, 7.5-20 × 4.5-5 μm. According to molecular phylogenetic analysis, the iso-lated pathogen strain was identified as a new species, which was named Col-letotrichum dracaena-fragrantis sp. nov. [Conclusion] This study provided theoretical basis for the prevention and control of anthracnose.展开更多
The system research aimed at activation laws caused by coal mining in fault footwall based on the rock strata me- chanics theory in this paper. According to the three-belt characteristics of overlying strata above min...The system research aimed at activation laws caused by coal mining in fault footwall based on the rock strata me- chanics theory in this paper. According to the three-belt characteristics of overlying strata above mined-out area, the fault acti- vation effect was divided into the following three periods： the initial activation, the excessive activation and the ultimate activation. Corresponding activation criterion was also deduced by the mechanics theory. Results of engineering example and numerical analysis show that the activation criterion can reflect the activation laws of fault caused by coal mining.展开更多
The geological characteristics of coalbed methane from the research carried out in Liupanshui is based on analysis of faults, folds, roof and floor lithology, and depth of coal seam gas content, combined with the asse...The geological characteristics of coalbed methane from the research carried out in Liupanshui is based on analysis of faults, folds, roof and floor lithology, and depth of coal seam gas content, combined with the assessment of CBM resources calculated through buried depth scope, average coal seam thickness, and gas content, organized by the Ministry of Land and Resources in 2006, which launched the ＂national new round of coalbed methane re-sources evaluation＂ project to evaluate the coalbcd methane resources in the standard category and divided coal-bed methane resources into Ⅰ, Ⅱand Ⅲ Category of three resources categories. With this method on the other syncline to resources assessment, the area below 1 000 m is named as ] Category resources. And with the depth increasing, resources level decreases.展开更多
文摘In this study, identification and rDNA-ITS sequence analysis of an anthracnose pathogen on Dracaena fragrans were carried out. [Method] D. fra-grans leaves with lesions were used as experimental materials to isolate anthrac-nose pathogen. Morphological observation, rDNA-ITS amplification and sequence analysis were performed to identify the pathogen strain. [Result] Caonidia of the iso-lated anthracnose pathogen were straight or curved, el iptic to crescent, with 2-5 oil droplets, 7.5-20 × 4.5-5 μm. According to molecular phylogenetic analysis, the iso-lated pathogen strain was identified as a new species, which was named Col-letotrichum dracaena-fragrantis sp. nov. [Conclusion] This study provided theoretical basis for the prevention and control of anthracnose.
基金Supported by the National Natural Science Foundation of China （51104063, 51074071） the Scientific Research Fund of Hunan Provincial Education Department （10C0665）+1 种基金 the Open Foundation of Htman Key Laboratory of Safe Mining Techniques of Coal Mines （200904） the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Htman Province
文摘The system research aimed at activation laws caused by coal mining in fault footwall based on the rock strata me- chanics theory in this paper. According to the three-belt characteristics of overlying strata above mined-out area, the fault acti- vation effect was divided into the following three periods： the initial activation, the excessive activation and the ultimate activation. Corresponding activation criterion was also deduced by the mechanics theory. Results of engineering example and numerical analysis show that the activation criterion can reflect the activation laws of fault caused by coal mining.
基金Supported by the National ＂973＂ CBM project （2009CB219605） the National Science and Technology of major special projects （201 IZX05034）： the National Natural Science Foundation of China （40730422）
文摘The geological characteristics of coalbed methane from the research carried out in Liupanshui is based on analysis of faults, folds, roof and floor lithology, and depth of coal seam gas content, combined with the assessment of CBM resources calculated through buried depth scope, average coal seam thickness, and gas content, organized by the Ministry of Land and Resources in 2006, which launched the ＂national new round of coalbed methane re-sources evaluation＂ project to evaluate the coalbcd methane resources in the standard category and divided coal-bed methane resources into Ⅰ, Ⅱand Ⅲ Category of three resources categories. With this method on the other syncline to resources assessment, the area below 1 000 m is named as ] Category resources. And with the depth increasing, resources level decreases.
