Objective To find out the optimal supercritical CO2 fluid extr ac tion prosess for Tetrahydropalmatine. Methods The extraction process was optimiz ed by orthogonal design with the yield of Tetrahydropalmatine as markers. Three factors including extraction pressure, temperature and the volume of entrainer were observed. Results The optimal condition of supercritical CO2 fluid extrac tion process was: under the pressure of 15Mpa at 40 ℃ , 1.5 fold of 95 % EtO H with Corydalis yanhusuo W.T.Wang as the entrainer. Conclusion The optimal supe rcritical process is feasible, with the advantage of low temperature and energy consumption, short time, high production and no organic residua.

Objective To investigate the status quo of application of fall risk factors assessment scale in nurses of different position in geriatric ward . Method Eighty-six nurses in different position were investigated by fall risk factors assessment scale . Results About 89 . 5%of the nurses could assess the fall risk factors on time and 80 . 2%could do it accurately , and only 62 . 8%of them worked out their nursing orders based on the possible falls. In terms of the accuracy in using fall risk factors assessment, the primary nurses was poorer than the senior nurses, with statistically significant difference between them (P<0.05). Yet there were no significant differences between them in timeliness and pertinence at working out nursing orders (P>0.05). Conclusion We should strengthen the training to the clinical nurses in correctly using the fall assessment scale , in order to exert the diagnostic value of the fall assessment scale, reduce the incidence of falls and ensure the safety of the patients.