主题：茉莉花为什么会散发出迷人的香气？

张丽霞和施兆鹏表示，“为了探讨茉莉花香气形成，、释放的机理，采用透射电子显微镜，对不同释香阶段茉莉花瓣的细胞超微结构进行了观察。结果发现，茉莉花瓣细胞中存在电子密度较低、体积较大的颗粒和电子密度较高、体积较小的颗粒（分别简称为Gl和Gh颗粒），并在Gh颗粒周围存在清晰的晕圈；在茉莉花释香过程中，两种颗粒在形态上均发生明显的变化，推测 Gl颗粒可能是白色体，是茉莉花香气前体物或能量物质的贮存器，Gh颗粒可能为溶酶体，与香气形成的酶系统有关，Gh颗粒周围存在的晕圈可能是香气物质，香气物质的形成是Gl和Gh颗粒相互作用的结果。此外，同一细胞中Gh颗粒形态的变化具有不同步性的特点，为调控茉莉花香气释放速度提供了理论依据。

　　A STUDY ON THE DISSECTION STRUCTURE OF THE PETAL OF Jasminum sambac Zhang Lixia Shi Zhaopeng Liu Dehua Zhou Xiaoyun (1College of Foodstuff Science & Technology,HNAU,Changsha,410128)(2Hunan Province Key Lab of Crop Gene Engineering,Changsha,410128)ABSTRACT In order to probe into the aroma releasing place and the forming mechanism of Jasminum sambac L., the dissection basis structure of the petal as well as its changes during the arma releasing is observed by the light microscope and electronic scannign microscope. The results reads as follow:

　　(1)The dissection structure of the petals is distinctly different from the mature leaves.

　　(2) According to the differences on the shape ,the recover and the variant numbers of grains of the cell between the upper and the lowest epidermis ,it can be estimated that aroma is mainly released from the upper epidermis.

　　(3) The cells of petal contain many grains. The numbers of grains in the cells of the upper epidermis,the lowest epidermis and the middle cells decrease successively.The grains in the cells of petal decrease substantially during the aroma releasing .Therefore, it can be seen that these grains have some probable relation with the forming of fragrant contiuents in jasmine flowers.KEY WORDS Jasminum sambac petal dissection structure
Research on the Cell Microstructure of Jasminum sambac’s Petal

Zhang Lixia Shi Zhalpeng
　　(College of Foodstuff Science and Technology ,HNAU,Changsha,410128)
ABSTRACT In order to inquire the aroma forming and releasing mechanism in jasmine flowers,the cell microstructure of the petal during aroma releasing was observed through an electronic microscope.The results showed that there were two kinds of grains in the cells,one was large and had low electron density,Gl for short ,while the other was small and had high electron density,Gh for short.The latter ones had a circle around it which can be seen through the microscope. During the aroma releasing period,the shape of the two grains changed distinctly,which led to the inference that Gl was the leucoplast,the store-room of aroma precursors or energe substances,and that the Gh was probably the lysosome which os related to the enzyme system’s aroma producing .The circle around Gh is the formed fragrant constituents and the aroma forming is the result of the interaction of Gh and Gl .In addition,this experiment also provided the theoretic foundation to control the speed of aroma releasing on the basis of the fact the fact that in one cell,the shapes of Gh grains changed at different speeds .KEY WORDS Jasminum sambac petal cells ultrastructures.”（http://www.teanet.com.cn/chanping.htm）

值得一提的是，通过对脑电波的测试：发现薰衣草香、桉叶香、檀香和阿a-派烯的香气会引起人的阿a-波活动性增加，而茉莉花香气会增强人的β-波活力。（http://www.huatuo.org/title/xunyi.htm）

请教斑竹， 这里说的活动性和活力有什么区别？谢谢