Research on micro-silica gel used for powder modification of Angelicae Dahuricae Radix extract and its mechanism of promoting disintegration of Yuanhu Zhitong Dispersible Tablets Research on micro-silica gel used for powder modification of Angelicae Dahuricae Radix extract and its mechanism of promoting disintegration of Yuanhu Zhitong Dispersible Tablets Dynamics of the captured quantity of particulate matter by plant leaves under typical weather conditions Wettability on plant leaf surfaces and its ecological significance Dynamic distribution of moistening agent in preparation of Andrographis paniculata granule by high shear wet granulation