Determination of Content Limit of Isoflavone Glucoside of Hengshan Wild-simulated Astragali Radix by ROC Curve Method / 中国实验方剂学杂志

Objective: To explore the receiuer operating characteristic(ROC) curve mathematical statistics method to establish the content limit of isoflavones glucoside contents in Astragali Radix,in order to distinguish the difference in isoflavones glucoside content between Hengshan wild-simulated Astragali Radix in Shanxi and cultivated Astragali Radix in Gansu. Method: A total of 225 samples of 45 batches of wild-simulated Astragali Radix in Hengshan and 210 samples of 42 batches of cultivated Astragali Radix in Gansu were selected as research objects,and isoflavones glucoside contents of these samples were determined by using the method in the edition 2015 Chinese Pharmacopoeia. Data was statistically analyzed, and the ROC curve was used to determine the critical value of wild-simulated Astragali Radix in Hengshan and transplanted Astragali Radix in Gansu. Result: The average contents of isoflavones glucoside in imitative wild Astragali Radix in Henshan and cultivated Astragali Radix in Gansu were 0.107%and 0.039%respectively,with statistically significant differences(PConclusion: ROC curve can be used to distinguish the critical value of the wild-simulated Astragali Radix in Hengshan and cultivated Astragali Radix in Gansu. The results reflected the regularity of "high quality and good price" in the market. The research provided a theoretical basis for the establishment of standard of high-quality Chinese herbal medicines.

Finite element analysis of wing-like memory alloy intrasegmental fixator for lumbar spondylolysis / 中国矫形外科杂志

[Objective]To analyze the mechanism of shape memory alloy imrasegmental fixator for lumbar spondylolysis(WMAIF)with finite element method.[Method]The three-dimensional model of WMAIF was established by using ANSYS 8.0 software for large finite element analysis.The model was extended with restriction in different parts,and to undertake corresponding mechanics calculation.[Result]The finite element model of WMAIF was set up,which could predict the strength and displacement of every node and element of its own structure in the course of deforming.[Conclusion]WMAIF is strong enough against tensile stress,which is a new and reliable intrasegmental instrument for direct repairing of lumbar spondylolysis.