OBJECTIVE: To establish an HPLC-DAD method for the determination of sulbactam pivoxil and the related substnaces in amoxicillin sulbactam pivoxil dispersible tablets. METHODS: The chromatographic column was Hypersil BDS with mobile phase consisted of potassium dihydrogen phosphate solution∶acetonitrile (40∶60) at a flow rate of 1.0 mL?min-1. The detector was diode array detector (DAD) at a detection wavelength of 204 nm and spectrum range of 300～190 nm. The injection volume was 10 ?L. RESULTS: The linear range of sulbactam pivoxil was 119.83～119 8.3 ?g? mL-1(r=0.999 9),with an average recovery rate of 98.7%(RSD=0.65%). The content of the related substances was 1.02%～1.10%. CONCLUSION: The method is simple and accurate,and it can be used for the quality control of amoxicillin sulbactam pivoxil dispersible tablets.

Objective To establish a simple diabetic peripheral neuropathy (DPN) rat model with the high fat-fed in GK rats. Methods A total of 30 GK rats (7-8 weeks) were fed with high-fat diet to establish the DPN model. Thirty normal Wistar rats were fed with ordinary diet (control group). The blood-sugar value, body mass, water-intake and food-intake were monitored every week in two groups. The serum level of glycosylated hemoglobin, the right sciatic nerve conduction velocity were detected at 8, 12 and 16 weeks respectively. The left sciatic nerve was used for HE and TUNEL staining. Results The manifestations of polydipsia, polyphagia and growth retardation were gradually appeared in GK rats. After 12 and 16 weeks, the blood-sugar and glycosylated hemoglobin were significantly increased in GK rats compared with those of normal Wistar rats (P < 0.01). The sensory nerve conduction velocity decreased obviously (P < 0.01). And motor nerve conduction velocity showed a certain decline trend (12 week P < 0.05,16 week P > 0.05). The sciatic nerve pathological features and Schwann cell apoptosis suggested that the model of DPN was successfully established (apoptosis index, P <0.01). Conclusion GK rats fed by high-fat diet are the satisfactory models of the DPN in experimental research. And 12-week is a suitable and economical time for molding.

In this study we take a closer look at the diseases that afflicted Japanese police officers who were stationed in a remote mountainous region of Taiwan from 1921 to 1944. Samples were taken from the latrine at the Huabanuo police outpost, and analyzed for the eggs of intestinal parasites, using microscopy and ELISA. The eggs of Eurytrema sp., (possibly E. pancreaticum), whipworm and roundworm were shown to be present. True infection with Eurytrema would indicate that the policemen ate uncooked grasshoppers and crickets infected with the parasite. However, false parasitism might also occur if the policemen ate the uncooked intestines of infected cattle, and the Eurytrema eggs passed through the human intestines. These findings provide an insight into the diet and health of the Japanese colonists in Taiwan nearly a century ago.
Animals ; Asian Continental Ancestry Group ; Cattle ; Diet ; Eggs ; Enzyme-Linked Immunosorbent Assay ; Grasshoppers ; Gryllidae ; Humans ; Intestines ; Microscopy ; Ovum ; Parasites ; Police ; Taiwan ; Toilet Facilities

Objective:To observe the effects of virtual reality (VR) technology combined with scenario-based simulation training in obstetrics and gynecology internship teaching.Methods:Ninety-eight medical students interned in the department of obstetrics and gynecology from June 2021 to May 2022 were included. Among them, 49 students received conventional clinical internship teaching of obstetrics and gynecology in the control group, while the other 49 students received scenario-based simulation training with VR technology in the observation group. The two groups were compared in terms of test scores, learning ability assessed by the Self-Rating Scale of Self-Directed Learning, post competency, and the degree of satisfaction with teaching quality. The data were analyzed through the chi-squared test and t test with the use of SPSS 20.00. Results:The observation group had significantly higher scores than the control group in theoretical knowledge [(35.51±2.21) vs. (32.17±3.22)], case analysis[ (16.52±1.51) vs. (13.37±2.03)], and practical operation skills (all P<0.05). After teaching, the learning ability and post competency were significantly improved in both groups (both P<0.05), which were significantly better in the observation group than in the control group (both P<0.05). The degree of satisfaction with teaching of the observation group was significantly higher than that of the control group ( P<0.05). Conclusion:VR technology combined with scenario-based simulation training can help improve teaching quality and enhance medical students' learning ability and post competency, with a high degree of satisfaction with teaching quality, which is worth promotion and application.

Objective To establish an intestinal organoid-based assay to investigate the radiation mitigation effect of epiregulin in vitro. Methods Intestinal crypts were released from tissue incubated with EDTA. Intestinal crypts seeded in 3D matrigel were irradiated at 24 h after plating. The radiation mitigation effect of epiregulin was evaluated by measuring the survival rate, size and budding numbers of the organoid after irradiation, and the basic FGF was used as a positive control of epiregulin. Results Radiation-induced lethality and dose-dependent survival curve of the intestinal organoid were consistent with in vivo data. Treatment with epiregulin (400 ng/ml) at 24 h post-radiation significantly increased survival rate of 8 Gy X-ray irradiated intestinal organoid in comparison with non-treated group [(12.56 ± 1.02)％vs. (4.73 ± 0.38)％, t=12.43,P<0.05]. Conclusions Epiregulin has radiation mitigation effect on intestinal organoid and could serve as a potential medical countermeasure to mitigate gastrointestinal toxicity.

Objective To examine the effect of adolescent intermittent ethanol exposure (AIE) on ethanol-induced conditioned place preference (CPP) and anxiety-like behavior in adolescent mice. Methods In experiment 1, adolescent male C57BL/6 mice at 4 weeks of age were randomly divided into AIE group and NS group (n=10 for each group). The binge drinking model was established by AIE (3 g/kg, 25%). The alcohol reward was evaluated using the ethanol-induced CPP paradigm (2 g/kg, 20%). In experiment 2, the anxiety-like behavior of adolescent male C57BL/6 mice were assessed using the elevated plus maze (EPM) test, and the animals were then allocated into high-anxiety mouse (HAM) and low-anxiety mouse (LAM) groups based on the percentage of open arm time (OT%). HAM and LAM were randomly divided into AIE group and NS group (n=8～10 for each group) with random number method, respectively. Then, anxiety-like behavior in four groups was measured again using the EPM test. Results In experiment 1. Ethanol preference (116.1± 12.9)s vs. (70.8±14.8)s, P=0.035) was significantly higher in AIE group relative to NS group. However, In experiment 2. The alteration in anxiety-like behaviors was not significant in either HAM-AIE or LAM-AIE groups (all P＞0.05). Conclusions AIE reinforces ethanol-induced CPP but does not affect the anxiety-like behavior in adolescent mice, suggesting that AIE may not play a role in anxiety-like behavior.

Objective To examine the effect of NK1 receptor ( NK1R) antagonist L-703,606 on ethanol-induced conditioned place preference (CPP) and levels of NK1R protein in different brain regions in juvenile mice. Methods Four-week-old male C57BL/6 mice were divided into high anxiety group and low anxiety group according to the percentage of time spent in open arms of elevated plus maze(EPM). Then the mice in the two groups were divided into control group and experimental group according to random number table,which were high anxiety control group,high anxiety experimental group,low anxiety control group and low anxiety experimental group,with 11 in each group. L-703,606 was injected intraperitoneally 40 minutes before CPP training in the high and low anxiety experimental group,while the control group received solvent treatment. After CPP test,the anxiety level of four groups of mice was detected by EPM again. The expres-sion of NK1R protein in hippocampus,prefrontal lobe and amygdala of mice was detected by Western blot. Results Compared with the high anxiety control group, the CPP value of the high anxiety experimental group was lower,and the difference was statistically significant ((77. 7 ± 9. 3) s vs (13. 6 ± 13. 0) s,P=0. 002). Compared with the low anxiety control group,the CPP value of the low anxiety experimental group was lower,and the difference was statistically significant ((113. 2±10. 3)s vs (28. 0±9. 6)s,P<0. 01). Af-ter L-703,606 treatment,there was no significant difference in the percentage of open arm time between the control group and experimental group either in high anxiety group or in low anxiety group (both P>0. 05) . Compared with the high anxiety control group,the expression of NK1R increased in hippocampus,prefrontal lobe and amygdala of mice in high anxiety experimental group (all P<0. 05). And the expression of NK1R in the above three brain regions had the same result between the low anxiety control group and the low anxiety experimental group (all P<0. 05). Conclusions L-703,606 can attenuate ethanol-induced CPP but has no effect on anxiety-like behaviors,suggesting the direct effect of NK1R in alcohol reward in juvenile mice.

Objective:To develop a candidate reference method for cortisol in human serum by isotope dilution liquid chromatography-tandem mass spectrometry (ID-LC/MS/MS).Methods:An isotope-labeled internal standard was added to samples, followed by alkalizing with sodium carbonate solution and liquid-liquid extraction with n-hexane/ethyl acetate. Isoelution with a methanol aqueous solution was employed for liquid chromatographic separation, while ESI in the positive ion and multiple reaction monitoring mode were used for mass spectrometry. The volume of sample, standard, and internal standard solutions were all controlled by weighing, and the results were calculated by bracketing method. The accuracy, precision, specificity, linearity, LOD and LOQ of this method were evaluated referring to the CLSI C62-A and C50-A guidelines and the domestic expert consensus documents.Results:The method demonstrated excellent accuracy and precision with the bias of ERM-DA192, ERM-DA193 and RELA 2021-2023 all being less than 2%. The recovery of added cortisol ranged from 98.2% to 101.1%. Both intra- and inter-assay imprecisions was <2%. The method was free from interference by structural analogue and showed a good linearity in the range of 25-1 600 nmol/L. The LOD and LOQ were 0.5 nmol/L and 1.0 nmol/L, respectively. A cortisol assay kit (chemiluminescence immunoassay) traced to this candidate reference method was used to determine 46 clinical serum samples concurrently, and the two methods exhibited good correlation.Conclusions:A candidate reference method for the determination of cortisol in serum was established, demonstrating high sensitivity, good repeatability and accuracy. This method can serve as a reference for the measurement traceability and accuracy evaluation of routine methods.

Objective To establish and optimize a method for simultaneous determination for the contents of sodium,potassium,calci-um and magnesium ions in serum using microwave digestion combined with ion chromatography,and evaluate its performance.Methods Serum samples were pretreated by microwave digestion,and four cations were quantitatively determined using ion chromatography.The linearity,precision,recovery and accuracy of the established method were verified with reference to the EP6-A and EP15-A3 docu-ments issued by the Clinical and Laboratory Standards Institute(CLSI).Results The imprecisions of determinations for sodium,po-tassium,calcium and magnesium ions expressed as coefficient of variation(CV)were 0.10％to 0.36％,0.15％to 0.48％,0.22％to 0.87％and 0.21％to 0.73％,respectively.The recoveries with adding standard of the four cations were between 97.3％and 103.0％.Referred to RELA2020 and RELA2021,the deviations of the analysis results were-0.57％to-0.14％,-0.84％to-0.16％,-1.82％to-0.37％,and-0.60％to 0.34％for sodium,potassium,calcium,and magnesium,respectively,and all the comparisons were pas-sed.The limits of detection/quantification were 0.017 5/0.058 3 mmol/L,0.000 5/0.001 7 mmol/L,0.009 9/0.032 9 mmol/L and 0.001 1/0.003 5 mmol/L for the four cations,indicating that after pretreatment,no significantly interfere from other impurities for the results of determination was found.Conclusion A method for simultaneous determination of sodium,potassium,calcium and magnesi-um ions in serum was successfully established and optimized using microwave digestion combined with ion chromatography.The method showed good precision and accuracy,simple operation,short time consumption and low cost,thus it could be used for quality improve-ment of clinical electrolyte testing in serum.

Objective:To construct the delirium prevention nursing program in ICU children and explore its clinical effect.Methods:The literature analysis and expert meeting method were used to construct the delirium prevention nursing program in ICU children. Using the convenient sampling method, a total of 315 ICU children who were admitted to Children's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine from February to July 2020 were selected as the control group and 309 ICU children admitted from August 2020 to January 2021 were selected as the experimental group. The control group adopted routine nursing, while the experimental group adopted delirium prevention nursing program in ICU children on the basis of routine nursing. The differences in the incidence of delirium, mechanical ventilation time, ICU stay and ICU costs were compared between the two groups.Results:After the intervention, the incidence of delirium in the experimental group was 15.9% (49/309) and the ICU stay was 4.0 (2.5, 7.0) days, which were lower than 29.2% (92/315) and 5.0 (3.0, 10.0) d in the control group, and the differences were statistically significant (χ 2=15.892, Z=-2.341; P<0.05) . Conclusions:The establishment and application of delirium prevention nursing program for ICU children can effectively reduce the incidence of delirium in ICU children and length of stay in ICU.