Objective: The method for separation by capillary zone electrophoresis (CZE) and electrochemical determination of organic acids in fruit juices was developed. Method: In this system, 0.2mmol/L cetylpyridinium bromide (CPB) was used as an electro osmotic flow (EOF) modifier to reverse the direction of EOF. cyclodexfrin ( -CD) was added into running buffer to improve the separation efficiency. Then, the optimal separation conditions were achieved and successfully employed to separate six organic acids, including oxalic, malic, tartaric, succinic, fumaric acid and citric acids. One nano palladium modified carbon paste electrode was used for determination. Results: The calibration curves for all organic acids studied were linear with 2-3 orders (1 10–6-1.0 10–3 mol/L) of magnitude and all the detection limits (S/N=3) were below 2 mol/L. The RSD was between 1.05%-2.15% , and recovery was 93.4% . Conclusion: CZE separation combined with electrochemical detection is suitable for simultaneous determination of organic acids in fruit juices quickly with high sensitivity and selectivity.

This paper reports an experimental study of the dynamic change of plasma-angiotensin Ⅱ (AgⅢ) level and its significance in 24 rabbits with crush syndrome. The average values of Ag Ⅱ at 24, 48 and 72 hours after the crush experiment were about 5.5 times as before, the increment of Ag Ⅱ at 24 and 48 hours after the crush were significant (P

Objective To establish a method for the determination of eugenol in Xiao’er Fuxie Waifu Gel.Methods RP-HPLC method was developed with Lichrospher-C18 analysis column,using methyl alcohol-water(65:35) as mobile phase.The detection wavelength was 280 nm and flow rate was 1.0 mL/min.Results The linear range of eugenol was from 0.108 to 1.724 ?g(r= 0.999 9).The average recovery was 99.1 %and RSD was 1.4 %.Conclusion The method is convenient and accurate.It can be used for the quality control of Xiao’er Fuxie Waifu Gel.

OBJECTIVE: To determine the concentration of sodium L-lactate in sodium lactate injection. METHODS: Lactic oxidase was immobilized at a hydrogen peroxide electrode and the enzyme electrode was used for the amperometric determination of sodium L-lactate in sodium lactate injection. Sodium D, L-lactate in injection was analyzed by that technique according to Chinese Pharmacopoeia. RESULTS: The quantity of sodium L-lactate was about 10% in total amount of sodium D, L-lactate in sodium lactate injection. CONCLUSION: Sodium L-lactate in sodium lactate injection could be determined specially, rapidly and inexpensively.

ObjectiveTo investigate the effect of glucagon-like peptide-2(GLP-2) on intestinal barrier function in the bile duct ligated rats.MethodsSeventy-two SD rats were randomly divided into three groups:GLP-2 treated group(T group),obstructive jaundice control group (C group) and sham operation group (SO group).The mRNA expression of GLP-2R was measured by semi-quantified reverse transcription polymerase chain reaction (RT-PCR)and the bcl-2 expression in the intestinal mucosa was measured by immunohistochemistry staining equipped image analyzing systems (Image proplus Version 4.5).ResultsThe mRNA expression of GLP-2 in intestinal mucosa in T group was higher than that in C group (P＜0.05) but lower than that in SO group (P＞0.05).The expression of bcl-2 in the intestinal villi of rats in C group showed more significant decrease (P＜0.05) than those in the SO and T groups especially on day 3 and 7 after operation (P＜0.05).ConclusionsGLP-2 may increase the mRNA expression of GLP-2R,stimulate the growth of intestinal mucosa,diminish the number of the apoptosis cells,and protect the intestinal barrier function in obstructive jaundice rats.

Objective To compare and analyze DMLC(Sliding Window,SW)and SMLC(Step and Shoot,SS)for delivering IMRT.Methods 5 patients with nasopharyngeal carcinoma were treated with radical intensity modulated radiation therapy using Varian 23EX and Helios tool on a Varian Eclipse system.Different modalities to deliver IMRT were considered for Sliding Window(SW) and Step and Shoot(SS) techniques using a different number of intensity levels(e.g.5,10 and 20).The total beam-on-time,total delivery time and a number of dose-volume parameters regarding PTV and OARs were considered.Results Comparing with the DVH,it was found that SW was the best of the four modalities in the dose distribution of PTV,but SS was better when considering the protection of OARs.The total beam-on-time(MUs) requirement for SS was 9～23% less than SW,but the total delivery time(in minutes)was about twice as long.Conclusion With the number of intensity level of 10 or more,no differences between SS and SW can be appreciated in the dose distribution of PTV and OARs sparing.Referring to the quality assurance,only leaf position needed to be checked in SS,whereas both leaf position and leaf speed need to be checked in SW,so it is proposed to use SS10 for delivering IMRT.

Up to now, a variety of microRNAs have been found in a number of studies, that specifically expressed in retinal neuroepithelial, lens, cornea and retinal pigment epithelium, in which miR-126 plays a certain role in the proliferation of tumor cells, the development of thymus lymphocytes and cardiovascular diseases.Some researches show that miR-126 has certain correlations with the formation of corneal neovascularization, the development of diabetic retinopathy, and the immune system related eye disease.In this paper, the current miR-126 in the role of eye disease mechanism and research progress were reviewed.

10.3969/j.issn.2095-4344.2013.25.025

Objective To evaluate and analyze the diagnostic accuracy of 256-slice computed topographic angiog-raphy (CTA) and coronary angiography (CAG) in patients with coronary artery disease (CAD). Methods One hundred and one patients (suspected CAD and confirmed CAD with re-examination) underwent the 256-slice CTA and CAG were includ-ed in this study. The coronary artery imaging data of 101 patients were retrospectively collected and analyzed. Calculations for accuracy were conducted on a segmental basis. A total of 1 313 comparable segments were evaluated. The accuracy of 256-slice CTA was evaluated in the diagnosis of moderate and severe stenosis of coronary artery(stenosis in segments of cor-onary artery≥50%). The values for diagnostic accuracy of 256-slice CTA were analyzed, including mild stenosis: ＜50%, moderate stenosis:50%~75%, severe stenosis:76%~100%and complete occlusion. Results The sensitivity of 256-slice CTA for diagnostic accuracy to coronary heart disease was 94.87%, and the specificity was 52.17%. The positive predictive value was 87.06%and the negative predictive value was 75.00%. The accuracy rates of 256-slice CTA for evaluating the cor-onary artery stenosis were:mild stenosis (44.23%), moderate stenosis (44.23%), severe stenosis (40.00%) and total occlusion of coronary artery (51.77%), respectively. Conclusion The diagnostic value of 256-slice CTA for the degree of coronary ar-tery stenosis is insufficient, which can be used as a potential alternative screening examination to detect coronary artery ste-nosis in suspected patients and a method of re-examination in low risk patients with CAD.

Objective RNA interference refers to post-transcriptional gene silencing caused by double strands RNA.To investigate the effect of EGFR receptor on esophageal carcinoma,the expression vector of HER4 gene targeted small interfering RNA was constructed to observe its silencing effect in human esophageal carcinoma cell line Eca-109,in order to find a promising method for the gene therapy of this disease.Methods Two complementary oligo DNA strands targeting HER4 gene were designed and synthesized according to the principles of designing siRNA.After annealing,oligo DNAs were inserted into SUPER.neo+gfp vector,then enzyme digestion analysis and DNA sequencing were applied.After transfecting it into human esophageal carcinoma cell line,we detected the level of expression of HER4 gene through real-time quantitative PCR and Western Blot.Results The enzyme digestion analysis and DNA sequencing show that HER4 gene targeted small interfering RNA and its expression vector were constructed successfully,and after transfection,the expression of HER4 gene in esophageal carcinoma cell line was suppressed greatly.Conclusion HER4 gene targeted small interfering RNA and its expression vector were constructed successfully,and could decrease the expression of HER4 gene in Eca-109 cell line,which laid the foundation for the following experiment.