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Xuejun, Cao,Jianhang, Zhu,Dongzhi, Wei,Hur, Byong Ki 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.3
Partition behavior of cephalexin and 7-ADCA in PEG-salts and EOPO-salts aqueous two-phase systems has been investigated under various different conditions. Effect of polymer molecular weight, salts types, tie line length on partition coefficients of cephalexin and 7-ADCA were described. Additives such as salts, water miscible solvents and surfactants were used to improve partition of cephalexin and 7-ADCA. NaSCN shows greatest influence on partition of cephalexin and 7-ADCA in 20% PEG 400-17.5% (NH_4)_2SO_4. Cephalexin and 7-ADCA partition coefficients reached 12.92 and 2.58, respectively. While NaCI shows greatest influence on partition of cephalexin and 7-ADCA in E0_40PO_60-(NH_4)_2SO_4. In 15% E0_40P0_60-13% (NH_4)_2SO_4 ATPS, partition coefficients of cephalexin and 7-ADCA reached 0.08 and 0.42, respectively. Cephalexin and 7-ADCA shows different partition trend in PEG-(NH_4)_2SO_4 and EOPO-(NH_4)_2SO_4 ATPS. In EOPO-(NH_4)_2SO_4 ATPS, diagrams of PEG3000-(NH_4)_2SO_4, E0_40PO_60-(NH_4)_2SO_4, E0_20PO_80-(NH_4)_2SO_4 were prepared and their differences were analyzed, and recovery of E0_40PO_60-(NH_4)_2SO_4 ATPS was performed with yield of 90-95%.
Jinchao Xu,Dong Wang,Jidan Liu,Chengyue Zhu,Jianhang Bao,Wenshuo Gao,Wei Zhang,Hao Pan 대한척추신경외과학회 2022 Neurospine Vol.19 No.3
Objective: The purpose of this study was to investigate the learning curve and complications of unilateral biportal endoscopy (UBE) in the treatment of lumbar disc herniation (LDH) and lumbar spinal stenosis (LSS). Methods: This was a retrospective cohort analysis of 197 consecutive patients who received UBE unilateral laminotomy bilateral decompression (UBE-ULBD) or lumbar discectomy (UBE-LD) surgery, including 107 males and 90 females with an average age of 64.83 ± 14.29 years. Cumulative sum (CUSUM) and risk-adjusted cumulative sum analysis (RA-CUSUM) were used to evaluate the learning curve, with the occurrence of complications defined as surgical failure, and variables of different phase of the learning curve were compared. Results: The cutoff point of learning curve of UBE surgery was 54 cases according to CUSUM analysis. The learning curve of UBE-ULBD and UBE-LD were divided into 3 phases. The first cutoff points were 31 and 12 cases, and the second cutoff point were 67 and 32 cases respectively. With the progress of the learning curve, the operation time and postoperative hospital stays decreased. The visual analogue scale and Oswestry Disability Index at the last follow-up were significantly lower than that before surgery. The incidence of surgical failure was 6.11% and began to decrease after the 89th case based on RA-CUSUM analysis. The surgical failure rate decreased from 10.11% to 2.78 after the 89th case with significant different. Conclusion: UBE surgery is effective in the treatment of LDH and LSS with low incidence of complications. But a learning curve of at least 54 cases still required for mastering UBE surgery.