The volatile oils from \%Houttuynia cordata \%Thunb. were obtained with supercritical CO\-\{2\}, steam distillation and petroleum ether extraction and analyzed qualitatively and quantitatively by GC\|MS. The results s...The volatile oils from \%Houttuynia cordata \%Thunb. were obtained with supercritical CO\-\{2\}, steam distillation and petroleum ether extraction and analyzed qualitatively and quantitatively by GC\|MS. The results showed that the chemical constituents of the volatile oils by three different methods are very different. The extraction rates of volatile oil by above\|mentioned three extraction methods are 1.764%, 0.040% and 0.082%, respectively. The volatile oil extracted by supercritical CO\-\{2\} extraction, which the content of houttuyninum reached 14.393%, is better than those with traditional methods.展开更多
In the present study,floral organogenesis of Saururus chinensis was observed and compared with that of 5. cernuus. The two species share essentially similar patterns of floral initiation and stamen development. Their ...In the present study,floral organogenesis of Saururus chinensis was observed and compared with that of 5. cernuus. The two species share essentially similar patterns of floral initiation and stamen development. Their inflorescence produces 'common primordia' in acropetal succession on the flanks of the inflorescence meristem. Each primordium bifurcates transversely to form a floral apex above and a bract primordium below. Six stamens arise in three pairs at the floral apex. The median sagittal pair arises first, the lateral distal pair second, and the lateral proximal pair arises last. On the contrary,the initiation of carpels is quite different from each other. In 5. cernuus, the median sagittal pair arises first, and the lateral pair next. In S. chinensis, however, the lateral pair arises first, and the median sagittal pair second. The present study also made a brief generalization using the data obtained from different fields on the relationship of the two species in the genus Saururus, which are展开更多
文摘The volatile oils from \%Houttuynia cordata \%Thunb. were obtained with supercritical CO\-\{2\}, steam distillation and petroleum ether extraction and analyzed qualitatively and quantitatively by GC\|MS. The results showed that the chemical constituents of the volatile oils by three different methods are very different. The extraction rates of volatile oil by above\|mentioned three extraction methods are 1.764%, 0.040% and 0.082%, respectively. The volatile oil extracted by supercritical CO\-\{2\} extraction, which the content of houttuyninum reached 14.393%, is better than those with traditional methods.
文摘In the present study,floral organogenesis of Saururus chinensis was observed and compared with that of 5. cernuus. The two species share essentially similar patterns of floral initiation and stamen development. Their inflorescence produces 'common primordia' in acropetal succession on the flanks of the inflorescence meristem. Each primordium bifurcates transversely to form a floral apex above and a bract primordium below. Six stamens arise in three pairs at the floral apex. The median sagittal pair arises first, the lateral distal pair second, and the lateral proximal pair arises last. On the contrary,the initiation of carpels is quite different from each other. In 5. cernuus, the median sagittal pair arises first, and the lateral pair next. In S. chinensis, however, the lateral pair arises first, and the median sagittal pair second. The present study also made a brief generalization using the data obtained from different fields on the relationship of the two species in the genus Saururus, which are
