运用EMBOSS(The european molecular biology open software suite)软件包中的CHIPS(Condonheterozygosity in a protein coding sequence)和CUSP(Create a condon usage table)程序对红豆杉属的52个基因的密码子偏性进行综合分析,并与...运用EMBOSS(The european molecular biology open software suite)软件包中的CHIPS(Condonheterozygosity in a protein coding sequence)和CUSP(Create a condon usage table)程序对红豆杉属的52个基因的密码子偏性进行综合分析,并与大肠杆菌、酵母、拟南芥和水稻的密码子偏性进行比较。结果表明,红豆杉属基因的Nc(有效密码子数)为45～58,大部分密码子使用频率较为一致。部分氨基酸密码子使用频率存在较大差异,如Ala、Asp、Phe、Gly、His、Asn、Arg、Thr、Tyr等。红豆杉属基因密码子偏性与拟南芥等双子叶植物较接近,与原核生物和单子叶植物相差较远。展开更多
A two-dimensional （2D） numerical model is developed for the wave sim- ulation and propagation in a wave flume. The fluid flow is assumed to be viscous and incompressible, and the Navier-Stokes and continuity equatio...A two-dimensional （2D） numerical model is developed for the wave sim- ulation and propagation in a wave flume. The fluid flow is assumed to be viscous and incompressible, and the Navier-Stokes and continuity equations are used as the governing equations. The standard k-e model is used to model the turbulent flow. The Navier- Stokes equations are discretized using the staggered grid finite difference method and solved by the simplified marker and cell （SMAC） method. Waves are generated and propagated using a piston type wave maker. An open boundary condition is used at the end of the numerical flume. Some standard tests, such as the lid-driven cavity, the constant unidirectional velocity field, the shearing flow, and the dam-break on the dry bed, are performed to valid the model. To demonstrate the capability and accuracy of the present method, the results of generated waves are compared with available wave theories. Finally, the clustering technique （CT） is used for the mesh generation, and the best condition is suggested.展开更多
文摘运用EMBOSS(The european molecular biology open software suite)软件包中的CHIPS(Condonheterozygosity in a protein coding sequence)和CUSP(Create a condon usage table)程序对红豆杉属的52个基因的密码子偏性进行综合分析,并与大肠杆菌、酵母、拟南芥和水稻的密码子偏性进行比较。结果表明,红豆杉属基因的Nc(有效密码子数)为45～58,大部分密码子使用频率较为一致。部分氨基酸密码子使用频率存在较大差异,如Ala、Asp、Phe、Gly、His、Asn、Arg、Thr、Tyr等。红豆杉属基因密码子偏性与拟南芥等双子叶植物较接近,与原核生物和单子叶植物相差较远。
文摘A two-dimensional （2D） numerical model is developed for the wave sim- ulation and propagation in a wave flume. The fluid flow is assumed to be viscous and incompressible, and the Navier-Stokes and continuity equations are used as the governing equations. The standard k-e model is used to model the turbulent flow. The Navier- Stokes equations are discretized using the staggered grid finite difference method and solved by the simplified marker and cell （SMAC） method. Waves are generated and propagated using a piston type wave maker. An open boundary condition is used at the end of the numerical flume. Some standard tests, such as the lid-driven cavity, the constant unidirectional velocity field, the shearing flow, and the dam-break on the dry bed, are performed to valid the model. To demonstrate the capability and accuracy of the present method, the results of generated waves are compared with available wave theories. Finally, the clustering technique （CT） is used for the mesh generation, and the best condition is suggested.
