An indirect square polarographic method was established f or the determination of ascorbic acid in pharmaceuticals using the oxidation-re duction action between Cu2＋ and ascorbic acid. There was a reduction wav e of Cu2＋ at about －0．24　V in buffer solution of NH3-NH4 Cl. The quantities of ascorbic acid is determination according to the decrement of peak heights when ascorbic acid was added. The linear range for ascrobic acid was 2.0×10－6～3．0×10－4 mol/L. Ascorbic acid in Vitami n C tablets was determined, the relative standard deviation is 2.9%.

Stereotactic body radiation therapy (SBRT) adopts different tumor-killing mechanisms from the conventional fractionated radiotherapy.In SBRT,a single high-dose radiation can destroy the membrane of tumor cells and induce the release of tumor-associated antigen,also named in situ tumor vaccine,which stimulates the immune system to kill the residual tumor;a single-fraction radiation with a dose larger than 8-10 Gy can induce rapid apoptosis of vascular endothelial cells via the acid sphingomyelinase pathway at 1-6 hours after radiation,which causes tumor vascular occlusion and secondary tumor-killing effects.In order to understand whether SBRT improves the clinical treatment outcomes via the above mechanisms,this paper reviews the clinical research advances in SBRT for primary liver cancer.

Objective To evaluate the clinical value of cerebrospinal fluid ADA,IL-23 joint detection in the diagnosis of tuberculous meningitis related diseases.Methods 253 cases with tuberculous meningitis related diseases were selected as the research subjects.According to the diagnosis,they were divided into tuberculous meningitis group (meningitis group,138 cases ),tuberculous meningitis complicated with hydrocephalus group (hydrocephalus group,35 cases)and control group(80 cases).All patients after admission received lumbar puncture, the part of cerebrospinal fluid specimens were inspected,the cerebrospinal fluid ADA,IL -23 joint test was conducted.Meningitis group and hydrocephalus group were given anti -TB drugs (INH,RFP and PZA +sm ) combined with chemotherapy.3 months after treatment,the meningitis group and hydrocephalus group received lumbar puncture cerebrospinal fluid ADA,IL -23 joint test again.The levels of ADA,IL -23 in cerebrospinal fluid were compared.Results Before treatment,cerebrospinal fluid ADA,IL-23 levels in the meningitis group were (12.64 ± 5.54)u/L and (48.38 ±10.78)pg/mL,those in the hydrocephalus group were (15.81 ±6.92)u/L and (77.21 ± 13.42 mm)pg/mL,which in the control group were (3.21 ±2.20)u/L and (9.05 ±3.89)pg/mL,ADA,IL-23 levels in meningitis group and hydrocephalus group before treatment were significantly higher than the control group (F=117.24,724.97,P<0.001).Spearma analysis showed that each group of cerebrospinal fluid ADA and IL-23 had no correlation.After treatment,the cerebrospinal fluid ADA,IL-23 levels in the meningitis group were (3.79 ± 3.13)u/L and (13.46 ±6.62)pg/mL,which in the hydrocephalus group were (6.42 ±4.35)u/L and (25.42 ± 8.54)pg/mL,the meningitis group before and after treatment had statistically significant differences in cerebrospinal fluid ADA,IL-23 (t=16.34,32.43,all P<0.001);hydrocephalus group before and after treatment had statistically significant differences in cerebrospinal fluid ADA,IL-23 (t=6.80,19.26,all P<0.001 ).Conclusion Cerebro-spinal fluid ADA,IL-23 joint detection in the early diagnosis of tuberculous meningitis related diseases and clinical observation has high clinical value.

Objective To investigate the efficacy of intravenous antioxidants therapy in treating moderately severe acute pancreatitis (MSAP) and severe acute pancreatitis (SAP).Methods Pubmed,Embase,Cochrane library and CNKI databases for all randomized control trials published before March 18st,2016 manually was searched by computer.Data on AP associated mortality and length of stay (LOS) were collected.The quality of the trials included was assessed by the Cochrane systematic review method.Results Fifteen trials with data of 620 patients were eligible for final inclusion.Among the 15 trials,detailed randomization for grouping was clearly described in 5 studies and obvious bias was observed in 1 study.Three studies had obvious biases considering whether outcome assessment was blinded,outcome data was incomplete and outcome report was selective.No other apparent bias was found.Statistical analysis showed that compared with control group,intravenous antioxidants administration did not significantly reduce mortality (12.1 vs 9.7,RD=-0.02,95％ CI-0.08～-0.03,P=0.44;RR=0.83.95％ CI0.51～ 1.34,P=0.44),but could shorten LOS (MD=-2.02;95％ CI-4.00～-0.05;P=0.04).Conclusions Intravenous antioxidants could greatly shorten LOS of patients with MSAP and SAP.

Objective To gain more pathophysiolgic knowledge about acute obstructive hydrocephalus and to explore its rapid and effective treatment by establishing canine acute obstructive hydrocephalus model.Methods Acute obstructive hydrocephalus model was established by injecting cyan-acrylic gel glue into the fourth ventricle via posterior fosse craniotomy in 9 male adult mongrel dogs.At the same time,lateral ventricle catheterization were performed and were fixed on the scalp to connect reservoir bag so that the changes of intracranial pressure (ICP) could be measured dynamically,and the changes of neurological function were observed.Results Acute obstructive hydrocephalus model was successfully established in 6 of the total 9dogs.ICP was (48.2 ± 6.1 ) cm H2 O at 48 hours after the injection and was (56.4 ± 5.7 ) cm H2 O at 72 hours after the injection,it increased 392％ and 459 ％ respectively.And the ICP after injection was significantly different(P ＜ 0.01 )compared with that before injection (12.3 ± 3.1 )cm H2O.Conclusion The establishment of acute obstructive hydrocephalus model has high success rate,and is easy to reduplicate; ICP could be measured dynamically and also could be reduced by releasing CSF;Thus,ventricular drainage is the most rapid and effective treatment for acute obstructive hydrocephalus.

Objective To discuss the clinical effect of different surgery in the treatment of shunt-dependent hydrocephalus by comparing the postoperative complications of ventriculoperitoneal(V-P) shunt surgery with different incidence of eminence puncture or the triangle puncture.Methods 98 patients with shunt-dependent hydrocephalus who underwent V-P shunt were analyzed.According to different operation methods,they were divided into eminence puncture group (63 cases) and triangle puncture group (35 cases).The operation time and postoperative complications were compared between the two groups,and the clinical efficacy was compared by Glasgow Coma Scale (GCS) score at the end of 12 months follow-up.Results The operation time of the eminence puncture group [(53.35 ± 5.72) rain] was longer than (35.52 ± 9.18) min of the the triangle puncture group (t =6.024,P ＜ 0.05).The incidence rate of complication in the eminence puncture group was lower than that in the the triangle puncture group at postoperative 12 months (x2 =4.395,P ＜ 0.05).Postoperative CT examination found that the ventricle width of the two groups was decreased in different degree.The improvement of Evan's index(t =40.86,P ＜0.05) and GCS score(U =4.50,P ＜ 0.05) in preoperative of the eminence puncture group were greater than those of the triangle puncture group after 12 months.Conclusion The clinical efficacy of V-P shunt of the frontal lateral ventricle puncture may be superior to the triangle puncture in the treatment of shunt-dependent hydrocephalus.

Purpose To investigate the expression of Beclin1, LC3 and mTOR in colorectal cancer ( CRC) and their significance. Methods Immunohistochemistry, Western blot and real-time PCR were employed to detect the expression of Beclin1, LC3 and mTOR in CRC. Results The positive expression rate of Beclin1, LC3 and mTOR in 242 cases of CRC was 90. 50%, 87. 19% and 46. 28%, respectively, which were higher than that in adjacent tissues ( P<0. 05 ) . Moreover, the expression of LC3 in moderately and poorly differentiated CRC was higher than that in well differentiated CRC, and the positive rate of LC3 in CRC with lymph node metastasis was higher than that in CRC without lymph node metastasis. The overexpression of mTOR was related to lymph node metasta-sis (P<0. 05), but both differentiation degree and lymph node metastasis were not associated with Beclin1 (P>0. 05). The expres-sion of LC3 was positively correlated with Beclin1 and negatively correlated with mTOR in colorectal cancer (rs =0. 593, P<0. 01, rs= -0. 165, P<0. 01), and the expression of Beclin1 was not associated with mTOR (P>0. 05). Kaplan-Meier survival analysis re-vealed that the five-year survival rate of patients without nodal metastasis, positive expression of Beclin1, LC3 and negative expression of mTOR was higher than those with nodal metastasis, negative expression of Beclin1 and LC3, and positive expression of mTOR. Cox survival analysis results revealed that LC3, mTOR and lymphnode metastasis were independent prognostic factors. The results of IHC, real-time PCR and Western blot in fresh CRC tissues indicated that the expression of Beclin1, LC3 and mTOR in colorectal cancer was significantly higher than that in adjacent tissues (P<0. 05). Conclusions The aberrant expression of Beclin1, LC3 and mTOR may be associated with the development and progression of colorectal cancer. The simultaneous detection of Beclin1, LC3 and mTOR genes in colorectal cancer may be helpful for the evaluation of the progressive degree and the judgment of prognosis.

Objective:To investigate hemodynamic characteristics of the modified Blalock-Taussig shunt (MBTS) with the preservation or ligation of ductus arteriosus (DA) based on computational fluid dynamics (CFD), thus to help preoperative surgery design and postoperative prediction.Methods:A patient with pulmonary atresia and patent ductus arteriosus was included. Patient-specific three-dimensional model was reconstructed and virtual surgeries of shunt insertion and ductus ligation or preservation were performed via computer-aided design (CAD). CFD was utilized to analyze hemodynamic parameters preoperatively and postoperatively based on patient-specific anatomy and physiologic data.Results:The preservation of DA competitively reduced the shunt flow but increased total pulmonary perfusion. The shunt flow and ductal flow collided with each other, causing large and complicated turbulence in pulmonary artery where lower wall shear stress and higher oscillatory shear index were distributed, as well as higher energy loss.Conclusion:The preservation of DA is riskier in hemodynamics which may lead to pulmonary over-perfusion, inadequate systemic perfusion and heavier cardiac burden, thus increasing the risk of heart failure and it seems to bring no benefit in terms of reducing risks of thrombosis.

Purpose To investigate the dosimetric differences among RapidArc (RA) plans which were designed on different target volumes in hepatocellular carcinoma (HCC).Methods A total of 10 HCC patients underwent 3D-CT scan under free breathing ( FB),end inspiration hold ( EIH ) associated with active breath coordinator (ABC) and 4D-CT scan.The 4D-CT were sorted into 10 sets of CT images according to respiratory cycle.The gross tumor volume (GTV) was manually contoured on different CT images.The individual internal gross target volume ( IGTV1 ) was obtained from 4D-CT,and the individual margins from GTVFB to IGTV1.IGTV2 were obtained from GTVFB using individual margins.The planned target volumes (PTV-1,PTV-2,PTV-3 and PTV-4 ) were obtained from GTVFB,IGTV1,IGTV2 and GTVEIA applying different margins.The RA plans (RA1,RA2,RA3 and RA4 ) were designed from different PTVs,and for RA1,RA2 and RA3 the simple 358° arc were used,while three 135° arcs were used for RA4.The dosimetric differences were compared.Results The PTV-1 and PTV-3 were larger than PTV-2 and PTV-4; the mean values of PtV-1/PTV-2 and PTV-1/PTV-4 were 2.5 and 1.9,respectively.There were no significant differences in conformal index,homogeneity index,maximum dose,and minimum dose of PTV among 4 RA plans.The irradiation dose of normal liver of RA3 and RA4 were 8.23 Gy and 7.63 Gy respectively,both significantly lower than those of RA1 and RA2 (10.21 Gy,9.62 Gy,x2 =10.68,P ＜0.05 ),and the V30of RA3 and RA4 were 5.24％ and 5.05％ respectively,both significantly lower than those of RA1 and RA2 (7.76％,6.12％,x2 =14.76,P ＜ 0.05 ).There were no significant differences in irradiation doses of stomach and duodenum among different plans.Conclusions Using 4D-CT or ABC technology with RapidArc in HCC can define the target volume accurately and achieve prefect dose distribution sparing more normal liver volume,compared to the traditional margins.4D-CT and ABC play similar roles in sparing normal liver.

Objective To investigate the feasibility and effectiveness of endovascular treatment of posterior communicating artery aneurysm (PcoAA)in keeping the fetal posterior cerebral artery (FPCA) patency. Methods Form January 2014 to December 2015,14 patients with ruptured PcoAA enrolled retrospectively were treated with endovascular embolization. Six of them were treated with simple coil embolization,3 with stent-assisted coil embolization,3 with double catheter-assisted coil embolization,1 with stent-assisted coil embolization + double catheter technique,and 1 with Y-stent in Yijishan Hospital, Wannan Medical College. The immediate embolization rate of PcoAA (using Raymond grade),prognosis of the patients (the modified Rankin scale score at 6 months after procedure),complications,and imaging follow-up results were analyzed. Results The success rate of coil and stenting was 100% . All the stents were accurately released in place without displacement. The immediate Raymond grading of the aneurysms displayed that Raymond grade Ⅰ was in 8 cases,Raymond grade Ⅱ was in 4 cases,and Raymond grade Ⅲ was in 2 cases. All FPCA were kept patent. A coil protruded into internal carotid artery in one case during the procedure. Others did not have any complications,such as intraoperative cerebral vasospasm,in-stent thrombosis,and rupture. All 14 patients were followed up for 3 -24 months after procedure. Two had recurrence. Both were aneurysms embolized with coils only. No rebleeding and ischemic
complications were observed. The modified Rankin scale scores in 13 cases were 0 -2 at 6 months after procedure,1 was 4. Conclusions Endovascular embolization for the treatment of PcoAA and keeping FPCA patency are safe and feasible. A variety of endovascular treatment modalities are necessary in order to keep FPCA patency.