针对锂硫电池中引入大量导电基质,导致能量密度较低的问题,采用模板法及CO2活化法制备一种高孔容介孔碳(活化介孔碳)。氮气静态吸附表明:CO2活化能够提高介孔碳的比表面积和孔容。活化介孔碳/S复合材料中硫载量为74. 8%。XRD、Transmiss...针对锂硫电池中引入大量导电基质,导致能量密度较低的问题,采用模板法及CO2活化法制备一种高孔容介孔碳(活化介孔碳)。氮气静态吸附表明:CO2活化能够提高介孔碳的比表面积和孔容。活化介孔碳/S复合材料中硫载量为74. 8%。XRD、Transmission Electron Microscope(TEM)和SEM测试显示;单质硫均匀分布在介孔碳的孔隙中;电化学测试结果显示;活化介孔碳/S复合材料在100 m A/g电流下(1. 2~3. 0 V),首次放电比容量达1 469 m Ah/g,循环100次,可逆放电比容量保持在804 m Ah/g,容量保持率为53. 7%,库仑效率为92%。所制备的活化介孔碳/S复合材料具有较好的电化学活性和良好的循环稳定性。展开更多
Establishment of a highly efficient regeneration system for the mature embryo of wheat will provide a convenient tool for wheat tissue culture and transformation, thereby facilitating the transformation of foreign gen...Establishment of a highly efficient regeneration system for the mature embryo of wheat will provide a convenient tool for wheat tissue culture and transformation, thereby facilitating the transformation of foreign genes into wheat. By using the mature embryos derived from 20 different wheat lines including Shi 4185, Yumai 66, Lunxuan 987, CB037, Yangmai 6, Xinchun 9, Bobwhite, Han 6172, Zheng 9023, Jimai 20, Ningchun 4, and Jing 411, the effects of some factors including inoculation methods, initiating culture media, organic additives, antioxidants, and auxins on the regeneration from the explants were evaluated. The results indicated that the scraping embryo culture was better than the whole embryo culture, the Aa medium was better than the SD2 medium and dicamba was better than 2,4-D in increasing the regeneration frequency. An Adi medium was established in this study by adding silver nitrate, cysteine, ascorbic acid, dicamba, glutamine into the Aa medium at the concentration of 4,40, 100, 2, and 5 mg L^-1, respectively. By using the Adi medium and the scraping technique, the regeneration frequencies of the mature embryos of CB037, Lunxuan 987, Hart 6172, Yangmai 6, Bobwhite, Zheng 9023, Shi 4 185, and Jimai 20 became 85.6, 60,1, 46.0, 42.1,42.0, 34.0, 33.0, and 32.0%, respectively, which were about 5-8 times higher than that obtained from the conventional culture mediums and techniques. This novel regeneration system could be helpful in wheat transformation.展开更多
文摘针对锂硫电池中引入大量导电基质,导致能量密度较低的问题,采用模板法及CO2活化法制备一种高孔容介孔碳(活化介孔碳)。氮气静态吸附表明:CO2活化能够提高介孔碳的比表面积和孔容。活化介孔碳/S复合材料中硫载量为74. 8%。XRD、Transmission Electron Microscope(TEM)和SEM测试显示;单质硫均匀分布在介孔碳的孔隙中;电化学测试结果显示;活化介孔碳/S复合材料在100 m A/g电流下(1. 2~3. 0 V),首次放电比容量达1 469 m Ah/g,循环100次,可逆放电比容量保持在804 m Ah/g,容量保持率为53. 7%,库仑效率为92%。所制备的活化介孔碳/S复合材料具有较好的电化学活性和良好的循环稳定性。
基金funded by the National Natural Science Foundation of China (30971776)the National Transgenic Organism Research Program of China(2008ZX08010-004)
文摘Establishment of a highly efficient regeneration system for the mature embryo of wheat will provide a convenient tool for wheat tissue culture and transformation, thereby facilitating the transformation of foreign genes into wheat. By using the mature embryos derived from 20 different wheat lines including Shi 4185, Yumai 66, Lunxuan 987, CB037, Yangmai 6, Xinchun 9, Bobwhite, Han 6172, Zheng 9023, Jimai 20, Ningchun 4, and Jing 411, the effects of some factors including inoculation methods, initiating culture media, organic additives, antioxidants, and auxins on the regeneration from the explants were evaluated. The results indicated that the scraping embryo culture was better than the whole embryo culture, the Aa medium was better than the SD2 medium and dicamba was better than 2,4-D in increasing the regeneration frequency. An Adi medium was established in this study by adding silver nitrate, cysteine, ascorbic acid, dicamba, glutamine into the Aa medium at the concentration of 4,40, 100, 2, and 5 mg L^-1, respectively. By using the Adi medium and the scraping technique, the regeneration frequencies of the mature embryos of CB037, Lunxuan 987, Hart 6172, Yangmai 6, Bobwhite, Zheng 9023, Shi 4 185, and Jimai 20 became 85.6, 60,1, 46.0, 42.1,42.0, 34.0, 33.0, and 32.0%, respectively, which were about 5-8 times higher than that obtained from the conventional culture mediums and techniques. This novel regeneration system could be helpful in wheat transformation.
