The phylogenetic relationships among all taxa within the Acrididae (Orthoptera: Acridoidea) were largely unknown until now. In this study, to further investigations, 24 species of Acrididae from China were used as ...The phylogenetic relationships among all taxa within the Acrididae (Orthoptera: Acridoidea) were largely unknown until now. In this study, to further investigations, 24 species of Acrididae from China were used as sample taxa. The sequence constitutions and variations were analyzed and the molecular phylogenetic trees were reconstructed based on the combined sequence data (795bp length in total) of 12S rDNA and 16S rDNA, using the grasshopper Pyrgomorpha conica of Pyrgomorphidae as the outgroup. The results showed that the rates of the two kinds of transitions are obviously much higher than that of the four kinds of Wansversions in these combined 12S+16S rDNA sequence data. The saturation ofnucleotide substitutions happened in 12S and 16S rDNA sequence data. The molecular phylogenetic trees indicated that Oedipodinae is a monophyletic group and this subfamily is a natural one, but Catantopinae and Acridinae are non-monophyletic. Oedipodnae is a relatively primitive group within the Acrididae, whereas the Oxyinae may have diverged later than Oedipodinae, but earlier than most other species of Acridide.展开更多
目的超导磁体产生的大梯度强磁场(large gradient high magnetic field,LGHMF)可实现变重力环境的模拟,其中利用超导磁体实现的抗磁悬浮技术是目前悬浮生物体、水等抗磁性物质的主要手段。为准确定位超导磁体中的抗磁悬浮或其他表观重...目的超导磁体产生的大梯度强磁场(large gradient high magnetic field,LGHMF)可实现变重力环境的模拟,其中利用超导磁体实现的抗磁悬浮技术是目前悬浮生物体、水等抗磁性物质的主要手段。为准确定位超导磁体中的抗磁悬浮或其他表观重力水平位点,建立了大梯度强磁场中抗磁性物质(尤其针对于生物体)的表观重力水平分析模型,可用于磁生物学、电磁医疗领域的研究。方法模型通过采集磁体内磁感应强度数据,应用中心差分算法计算场强梯度积,并计算出抗磁性物质的表观重力数值。此外,通过MATLAB软件的图形模块进行了实际表观重力水平整体分布仿真,同时结合软件数据拟合磁体纵向方向的连续表观重力水平函数。结果模型可准确分析出物质在磁场内各处的受力情况及磁体内所有表观重力水平的位点。仿真很好地反映出超导磁体强磁模拟重力环境下抗磁性物质表观重力水平的变化趋势,与原始出厂时的表观重力水平理论分布基本一致。结论该模型对磁体设备的二次开发及磁体实验的设计和分析有重要意义。展开更多
基金Supported by National Natural Science Foundation of China(30160015)
文摘The phylogenetic relationships among all taxa within the Acrididae (Orthoptera: Acridoidea) were largely unknown until now. In this study, to further investigations, 24 species of Acrididae from China were used as sample taxa. The sequence constitutions and variations were analyzed and the molecular phylogenetic trees were reconstructed based on the combined sequence data (795bp length in total) of 12S rDNA and 16S rDNA, using the grasshopper Pyrgomorpha conica of Pyrgomorphidae as the outgroup. The results showed that the rates of the two kinds of transitions are obviously much higher than that of the four kinds of Wansversions in these combined 12S+16S rDNA sequence data. The saturation ofnucleotide substitutions happened in 12S and 16S rDNA sequence data. The molecular phylogenetic trees indicated that Oedipodinae is a monophyletic group and this subfamily is a natural one, but Catantopinae and Acridinae are non-monophyletic. Oedipodnae is a relatively primitive group within the Acrididae, whereas the Oxyinae may have diverged later than Oedipodinae, but earlier than most other species of Acridide.
文摘目的超导磁体产生的大梯度强磁场(large gradient high magnetic field,LGHMF)可实现变重力环境的模拟,其中利用超导磁体实现的抗磁悬浮技术是目前悬浮生物体、水等抗磁性物质的主要手段。为准确定位超导磁体中的抗磁悬浮或其他表观重力水平位点,建立了大梯度强磁场中抗磁性物质(尤其针对于生物体)的表观重力水平分析模型,可用于磁生物学、电磁医疗领域的研究。方法模型通过采集磁体内磁感应强度数据,应用中心差分算法计算场强梯度积,并计算出抗磁性物质的表观重力数值。此外,通过MATLAB软件的图形模块进行了实际表观重力水平整体分布仿真,同时结合软件数据拟合磁体纵向方向的连续表观重力水平函数。结果模型可准确分析出物质在磁场内各处的受力情况及磁体内所有表观重力水平的位点。仿真很好地反映出超导磁体强磁模拟重力环境下抗磁性物质表观重力水平的变化趋势,与原始出厂时的表观重力水平理论分布基本一致。结论该模型对磁体设备的二次开发及磁体实验的设计和分析有重要意义。