The pollination mechanisms of Platycladus orientalis (L.) Franco and Thuja occidentalis L. seem to be of the same type, as based on the morphological study of the change in pollination drop, during the process of poll...The pollination mechanisms of Platycladus orientalis (L.) Franco and Thuja occidentalis L. seem to be of the same type, as based on the morphological study of the change in pollination drop, during the process of pollination. Entering the pollination drop, the pollen may alter the surface of the drop or reduce the secretion of the ovule with concomitant increase of evaporation. It has been further noticed that the dynamiechange of the drop withdrawal rate was closely associated with the different kinds of pollen received. It seemsthat the withdrawal of the pollination drop may be induced by pollen from plants consanguineous to P. orientalis, almost as effective as from pollen of P. orientalis itself and comparatively more effective than the foreignpollen received from distant plant species. The drop withdrawal could he mainly induced by the pollen that causes the reduction of ovule secretion.展开更多
The whole process of the thermal decomposition of GAP was investigated by thermolysis MS,TG DTG FTIR, in situ thermolysis FTIR coupling techniques,and possible mechanisms of GAP′s thermal decomposition is proposed. I...The whole process of the thermal decomposition of GAP was investigated by thermolysis MS,TG DTG FTIR, in situ thermolysis FTIR coupling techniques,and possible mechanisms of GAP′s thermal decomposition is proposed. It has been proved that the major decomposition products in the gas phase include N 2,NH 3,HCHO,HCN, H 2C CO etc. In the condensed phase,the formation of some aromatic intermediates was observed,and when temperature raised to 450 ℃,the characteristic absorbances of aromatics disappeared and a black brown residue was formed.展开更多
文摘The pollination mechanisms of Platycladus orientalis (L.) Franco and Thuja occidentalis L. seem to be of the same type, as based on the morphological study of the change in pollination drop, during the process of pollination. Entering the pollination drop, the pollen may alter the surface of the drop or reduce the secretion of the ovule with concomitant increase of evaporation. It has been further noticed that the dynamiechange of the drop withdrawal rate was closely associated with the different kinds of pollen received. It seemsthat the withdrawal of the pollination drop may be induced by pollen from plants consanguineous to P. orientalis, almost as effective as from pollen of P. orientalis itself and comparatively more effective than the foreignpollen received from distant plant species. The drop withdrawal could he mainly induced by the pollen that causes the reduction of ovule secretion.
文摘The whole process of the thermal decomposition of GAP was investigated by thermolysis MS,TG DTG FTIR, in situ thermolysis FTIR coupling techniques,and possible mechanisms of GAP′s thermal decomposition is proposed. It has been proved that the major decomposition products in the gas phase include N 2,NH 3,HCHO,HCN, H 2C CO etc. In the condensed phase,the formation of some aromatic intermediates was observed,and when temperature raised to 450 ℃,the characteristic absorbances of aromatics disappeared and a black brown residue was formed.
