The isozymes of peroxidase (POD) and superoxide dismutase (SOD) in leaves of Taxodium mucronatum Tenore, T. ’Zhongshansha 302’ and four strains of their hybrids were analysed. The result showed that SOD isozyme expr...The isozymes of peroxidase (POD) and superoxide dismutase (SOD) in leaves of Taxodium mucronatum Tenore, T. ’Zhongshansha 302’ and four strains of their hybrids were analysed. The result showed that SOD isozyme expressed only in May, POD isozyme had a certain difference among 6 samples in May and July, but notable differences existed in September, when POD isozyme of every hybrids had three bands from the paternal form, 3-6 bands respectively from the maternal form and a few new bands. It was suggested that the genetic characters of POD isozyme of both parents were stably inherited to their hybrids,but some variations occured in those hybrids and POD isozyme was a suitable enzyme system to distinguish the various hybrids.展开更多
文摘The isozymes of peroxidase (POD) and superoxide dismutase (SOD) in leaves of Taxodium mucronatum Tenore, T. ’Zhongshansha 302’ and four strains of their hybrids were analysed. The result showed that SOD isozyme expressed only in May, POD isozyme had a certain difference among 6 samples in May and July, but notable differences existed in September, when POD isozyme of every hybrids had three bands from the paternal form, 3-6 bands respectively from the maternal form and a few new bands. It was suggested that the genetic characters of POD isozyme of both parents were stably inherited to their hybrids,but some variations occured in those hybrids and POD isozyme was a suitable enzyme system to distinguish the various hybrids.
文摘采用中山杉单板单面涂胶,施胶量为260 g/m^2,以30°的倾角螺旋交错缠绕组坯、加压制备圆管,研究了圆管的轴压行为及环刚度。结果表明:轴压过程中,其破坏形式主要集中在圆管的端头、中部以及单板带拼缝处。单板横纹螺旋缠绕的圆管相对于单板顺纹横纹混合螺旋缠绕和单板顺纹螺旋缠绕的圆管,其端头及单板间接缝处易破坏,单板顺纹螺旋缠绕圆管外层对于端头及单板间接缝处有很好的约束作用。单板顺纹横纹混合螺旋缠绕圆管相对于单板横纹螺旋缠绕和单板顺纹螺旋缠绕的圆管,其轴压性能更好,内径110 mm的单板顺纹横纹混合缠绕圆管的轴压极限荷载可达22.2 k N。圆管的环向抗压能力可用环刚度评价,单板顺纹缠绕圆管的环刚度最大,单板横纹缠绕圆管的环刚度最小。
