Objective To observe the clinical disinfection effect of root canal with non-filling medication.Methods 50 patients who required root canal therapy for apical period(acute or chronic) or pulp necrosis were involved in the study.Non-filling medication on the root canals were taken bacteria from the root canals were collected and cultured before and after the treatment.Results Bacteria were detected in every specimen,which were mixture of aerobes and anaerobes.One week later,only two strain were detected in two specimen.Conclusion Non-filling medication can be used as an effective disinfection to sterilize root canal.

Objective To study any functional changes in the trigeminal nociceptive system in cases of migraine with aura (MWA) using painful heat-evoked potentials (CHEPs),and to explore the value of CHEP in evaluating the trigeminal small nerve fibers of patients with MWA.Methods Sixty patients with MWA were recruited as the MWA group,and 60 healthy persons were selected as a normal control group.Thermal stimulation at 51 ℃ was applied to the skin above the patients' right and left eyebrows.The N wave latencies and N-P amplitudes of the CHEPs were recorded at the vertex (Cz) of the head.The intensity of the stimulus was graded using a visual analogue scale (VAS).Results In the control group the simulation produced no significant differences in the N550 or P750 latencies or in the N-P amplitudes.In the MWA group no significant differences were observed when the headache side was stimulated,but the N550 and P750 latencies were both significantly shorter than those of the control group and the N-P amplitude was significantly greater than that of the control group.The average VAS score on both sides in the patients with migraine was significantly higher than those of the control group.However,there was no significant difference in average VAS scores between the headache and non-headache sides of the patients with migraine.Conclusions CHEP is a reliable method for detecting any pathological changes in the trigeminal small nerve sensory pathway.Increased cutaneous allodynia in acute migraine attacks is detectable using CHEPs.

Objective To determine the baseline echocardiographic characteristics and the time course and degree of recovery of left ventricular (LV) systolic dysfunction in patients with tachycardia-induced cardiomyopathy ( TCM ) . Methods Seven hundred and fifteen patients received radiofrequency cather ablation ( RFCA ) for tachycardiarrhymias from July 2010 to July 2013 were screened in this study. Only 33 patients with reduced left ventricular ejection fraction (LVEF) (LVEF<50% and improved≥15%) were diagnosed with tachycardia-induced cardiomyopathy and were included in the study. Patients with early improvement (over 25%increase in LVEF at 1-week follow-up compared to the baseline ) were enrolled in the improved group , and the rest patients were enrolled in the improved group. All Patients received transthoracic echocardiography for LV size and function detection at 1 week and at 3,6,12 months follow-up. Results The average baseline of the LV end-diastolic diameter, and the LVEF were (55 ± 10.7)mm and (38 ± 4.6)%, repectively. Early improvement ( over 25%increase in LVEF at 1-week follow-up compared to the baseline ) in the improved group was observed in 16 patients. Patients with early improvement had higher LVEF at 12-month follow-up compared to the patients without early improvement [(69.2± 4.2)% vs (58.1 ± 6.9)%, P < 0.001]. Conclusions RFCA is proved to be a relatively safe and effecient treatment method. Atrial fibrillation related to TCM , rhythm control is superior to the rate control. The early improvement in LVEF may potentially predict the complete reversibility of LV systolic dysfunction.

A method was developed for determination of thirteen amines including seven aliphatic amines, two heterocyclic amines and four aromatic amines in atmospheric particulate matter (PM) by gas chromatography-mass spectrometry (GC-MS). Samples were ultrasonically extracted with ultra-pure water and derivatized with benzenesulfonyl chloride (BSC) under alkaline conditions. The derivatives were extracted with dichloromethane and then detected by GC-MS using DB-5MS chromatographic column. The method detection limit (S/N=3) and quantitation limit (S/N=10) were 0.00008-0.017 μg/mL and 0.00026-0.0565 μg/mL respectively, and the correlation coefficients were 0.9903-0.9996, which indicated that the standard curve had good linear correlation. In addition, the relative standard deviation was less than 30％ and the average recovery was 54.4％-159.7％ except for methylamine and benzylamine at spiked level of 1.0 μg/mL, showing high precision and accuracy. 9 kinds of amines were detected in the PM2.5 samples collected in Guangzhou city by this method, among which dimethylamine and butylamine accounted for 90％ of the total nine amines, which indicated that they were primary amines in PM2.5; while propylamine exhibited the lowest level in PM2.5 with the concentration less than 1.0 ng/m3.

BACKGROUND: There are numerous inducers used in inducing bone marrow mesenchymal stem cells (BMMSCs) differentiate into neuron-like cells, however, due to poisonous, most chemical inducers can not be used in human.OBJECTIVE: To investigate the effect of ligustrazine on differentiation of rat BMMSCs into neuron-like cells in vitro, and to search for the optimal inductive concentration.METHODS: After SD rats were anesthetized, bone marrow was obtained from the femoral and tibial bones, centrifuged, and the supernatant was discarded. The extracted cells were cultured in L-DMEM supplemented with 15% fetal bovine serum. The expression of CD44 and CD45 of the 5~(th) passage of BMMSCs were identified by immunocytochemical technique. Serum-free L-DMEM medium contains 1.00, 1.25 and 1.50 g/L ligustrazine concentrations were used to induce the 5~(th) passage of BMMSCs in vitro. Morphology changes of BMMSCs were observed under an inverted phase microscope. Expression of nestin, neuron-specific enolase and glial fibrillary acidic protein were identified by immunocytochemical technique, and the expression ratio of neuron-like cells' surface antigens induced by different concentrations of ligustrazine were compared.RESULTS AND CONCLUSION: ①Most primarily cultured BMMSCs adhered to the wall at 3 days after culture, which proliferated faster after passaged, and the 5~(th) passage of cells were mostly purified into BMMSCs, spread radially or vortex-likely. ②The 5~(th) passage of BMMSCs was positive expressed (98.02±0.81)% CD44, but negative for CD45. ③Neuron-like cells with prominence and bifurcation could be seen after induction. The immunocytochemical method showed that nestin and neuron-specific enolase in most induced cells were positive expressed, especially received a highest ration of neuron-specific enolase expressing in the induced group with 1.25 g/L concentration of ligustrazine. It revealed that ligustrazine can induce BMMSCs differentiated into neuron-like cells, and 1.25 g/L is the optimal inductive concentration.

Objective To observe the dynamics of F1 antibody and immunoglobulin M (IgM) in cats after vaccinated Yersinia pestis,to discuss the significance of detection of F1 antibody and IgM in surveillance of animal plague.Methods The 3 cats were vaccinated Yersinia pestis on their backs with muhipoint hypodermic injection and blood samples were collected via femoral vein on 3rd to 521st days after injection.F1 antibody was detected by sandwich Enzyme-linked immunosorbent assay (ELISA),and IgM of F1 antibody was determined with a capture antibody.Results After vaccinated Yersinia pestis for 3rd days,F1 antibody and IgM appeared slightly positive,with the titer of 1 ∶ 22.00 and 1 ∶ 20.33,respectively.The titer of F1 antibody increased to 1 ∶ 25.33 on the 4th day,and reached the peak of 1 ∶ 29.67 on the 97th day,kept 1 ∶ 25.33 on the 521st day.While the titer of IgM reached peak of 1 ∶ 212.00 on the 7th to 10th days,and decreased rapidly to below the positive standard on the 30th day.Conclusions Detection of F1 antibody in cats with plague by sandwich ELISA can trace plague prevalence in animals back to a long time,which may be applied for investigation of plague foci.A single serum sample can determine early animal plague with a capture antibody to detect IgM of F1 antibody in cat with the plague,and a single serum sample tested with the two methods at the same time for detection of F1 antibody and IgM can precisely verify the infection time of plague in animals for 3 to 7 days.

Objective To synthesize 131I labeled anti-neuropilin-1 monoclonal antibody A6 (131IA6) and evaluate its biodistribution and imaging in malignant glioma xenografts.Methods (1) A6 was labeled with 131I by Iodogen method under the optimum labeling conditions,then the labeling efficiency,radiochemical purity and stability were measured in vitro.(2) In vitro bioactivity,cellular uptake and receptor affinity of 131I-A6 with U87MG cells were measured.(3) The nude mice bearing human U87MG cells were randomly divided into 5 groups with 5 in each group.The nude mice were sacrificed by cervical dislocation and dissected at 24,48,72,96,and 120 h,respectively,after intravenous injection of 1.2 MBq 131I-A6.The biodistribution of the agent was measured as ％ID/g,and the ratios of tumor/blood (T/B) and tumor/muscle (T/M) were calculated.(4) SPECT/CT imaging was performed in 6 mice including 3 in the competitive inhibition control group at 24,48,72,96,and 120 h post injection.Two-sample t test was used for data analysis.Results (1) The labeling yield of 131I-A6 was (95.46±3.34)％,and the radiochemical purity was more than 95％.At 96 h of incubation in PBS,the radiochemical purity was more than 85％.(2)131I-A6 had rapid accumulation in U87MG cells and reached the peak of (15.80±1.30)％ at 1 h.When the probe was incubated with large excesses of non-radioactive A6,the uptake level of 131I-A6 in U87MG cells was significantly inhibited (t=2.862,P＜0.05).Kd of 131I-A6 binding to NRP-1 was (1.67±0.14) nmol/L in U87MG cells.(3) Biodistribution study showed that the uptake in blood,liver and tumor was (8.00±1.42),(7.68±1.56) and (6.00±1.24) ％ID/g at 24 h,respectively.The uptake in muscle,brain and bone was lower.The T/B and T/M were 0.78±0.10 and 3.20±0.30 at 24 h,and they reached the highest level of 1.87±0.50 and 7.13±0.24 at 120 h.(4) The SPECT imaging showed that the tumors could be visualized at 24 h and delineated more clearly at 120 h post injection of 131I-A6.Conclusions 131I-A6 can be easily synthesized by Iodogen method with high radiochemical purity.The specific tumor uptake of 131I-A6,which correlates with NRP-1 expression in gliomas,suggests that it may be a new promising tumor targeting radiotracer.

Objective To evaluate the effectiveness and influencing factors of 131I treatment for cervical lymph node metastases of papillary thyroid carcinoma (PTC).Methods Eighty-nine post-operative PTC patients (24 males,65 females,11-72 years) with cervical lymph nodes as the only site of metastasis (negative serum TgAb,1-4 times of 131I treatment) on 131I planar Rx-WBS or SPECT/CT were retrospectively reviewed.Results of 131I Rx-WBS or SPECT/CT,serum Tg levels under both TSH-suppressed and TSH-stimulated conditions were measured and recorded.CR and PR were recognized as effective therapy.x2 test and logistic regression analysis were used to analyze the data.Results The effective rate of 1-4 times of 131I treatment was 57.30％(51/89),73.03％(65/89),80.90％(72/89),83.15％(74/89),respectively (x2=18.792,P＜0.01).Logistic regression analysis suggested that therapeutic effectiveness was related to the size of metastatic lymph nodes and whether metastatic lymph nodes could be visualized on the post-ablative 131I Rx-WBS or SPECT/CT.Conclusions 131I treatment is an effective modality for PTC patients with cervical lymph nodes as the only site of metastasis.The cumulative effective rate increased within a limited times of treatment.The size of metastatic lymph nodes and whether metastatic lymph nodes could be visualized on the first post-ablative 131I Rx-WBS or SPECT/CT are the key factors for the therapeutic effectiveness.

Objective To investigate the critical value of TSH-stimulated Tg(sTg) in the diagnosis of metastasis from DTC, and to evaluate the diagnostic value of the ratio of sTg to suppressed Tg (sTg/suppressed Tg).Methods A total of 330 post-operative DTC patients(87 males, 243 females, age range: 12-70 years)who underwent thyroid remnant ablation from August 2008 to December 2014 were retrospectively reviewed.Their serum TgAb levels were normal.The patients were divided into non-metastasis group(147 cases)and metastasis group(183 cases) according to results of ultrasonography, CT and WBS.The difference of sTg between the two groups were compared by Mann-Whitney rank sum test.ROC curve was used to analyze the relationship between sTg, sTg/suppressed Tg ratio and metastasis, the cutoff value was calculated.Results The sTg was significantly different between the non-metastasis group and metastasis group: 1.0 (0.1, 2.0) μg/L vs 36.5 (3.9, 126.7) μg/L;u=-6.642, P<0.05.The AUC for ROC curve in metastasis group was 0.85, and the cutoff value was 2.05 μg/L, with the sensitivity 85.2%, specificity 67.3%, and accuracy 82.3%.While sTg<2.05 μg/L, the AUC of sTg/suppressed Tg ratio was 0.941, and the cutoff value was 4.3, with the sensitivity 93.3%, specificity 88.2%, and accuracy 92.3%.Conclusions The sTg has a specific value for the diagnosis of metastasis from DTC after operation and the cutoff value is 2.05 μg/L in this set of patients.The ratio of sTg/suppressed Tg could be used to correct the sTg and to improve the diagnostic sensitivity.

BACKGROUND:Currently, limb salvage therapy has become the standard treatment of malignant bone tumors way, but improper treatments wil result in tumor recurrence, secondary infection, internal fixation or prosthesis loosening.
OBJECTIVE:Based on the traditional surgical principle for metastatic bone tumors of the limbs, this study designed a user-friendly, individualized, simplistic pal iative treatment regimen from the actual conditions of patients to observe the reasonability, clinical efficacy and prognosis of bone cement fil ing combined with internal fixation in the treatment of metastatic malignant bone tumors.
METHODS:Thirty-one patients with metastatic malignant bone tumors who required salvage treatment were screened from the Department of Orthopedics, the 421 Hospital of Chinese PLA, and their clinical data were retrospectively analyzed. Al the 31 patients were divided into two groups:tumor removal+internal fixation group (non-chemoradiotherapy group, n=11) treated with bone cement fil ing plus plate internal fixation (pal iative
treatment);tumor removal+internal fixation+chemoradiotherapy group (chemoradiotherapy group, n=20), treated with radiotherapy before internal fixation plus plate internal fixation with limb salvage. The fol ow-up period was 4-38 months, averagely 18 months.
RESULTS AND CONCLUSION:The fol ow-up results showed that in the non-chemoradiotherapy group, al the 11 patients survived, who could live independently and have good motor functions;in the chemoradiotherapy
group, 17 of the 20 patients survived and the rest three patients died of tumor metastasis, their poor conditions and complications at 9 and 13 months after internal fixation. In patients undergoing tumor removal+plate internal fixation with limb salvage, the integrated scores for nerve and motor functions were increased by more than
level 1. These findings confirm that a simple pal iative therapy of bone cement fil ing and internal fixation without chemoradiotherapy is better for metastatic malignant bone tumors patients who require limb salvage.