Objective To demonstrate the influence of stress on attentional bias in athletes,in order to make guidance for athletes' attention training and control.Method Using dot-probe paradigm,we analyzed the attention behavior of 25 athletes either under stress or not when viewing different pictures of emotional face.The reaction time and the score of the attention bias were recorded and compared.Result The reaction time to negative face pictures under stress was significantly shorter than that to the positive and neutral ones.The value of the attention bias to negative pictures was significantly bigger than O.Conclusion Stress tends to induce attention bias of athletes to negative information.

Objective To investigate the accuracy of serum neuron-specific enolase (NSE)predicting malignant middle cerebral artery infarction(mMCAI).Methods A total of 40 patients with acute massive cerebral infarction within 24 hours after symptom onset were recruited.Blood samples were collected at 24,36 and 48 hours after symptom onset.Serum NSE concentration was determined by automatic electrochemiluminescence analyzer.mMCAI was defined as hernia signs in clinical practice,and CT/ MRI showed mass effect.The receiver operating characteristic curve was used to analyze the accuracy of serum NSE concentration in predicting mMCAI at 3 time points.Results Sixteen patients(40%)developed mMCAI.The serum NSE concentration for predicting the accuracy of mMCAI was poor at 24 hours after symptom onset;the serum NSE concentration for predicting the specificity of mMCAI was high (96%)at 36 hours after symptom onset,but the sensitivity was lower(69%);the serum NSE concentration for predicting the specificity(92%)and sensitivity(88%)of mMCAI were high at 48 hours.Conclusions The serum NSE conoentration and its dynamic changes may predict the occurrence of mMCAI,and the predicting time points are appropriate from 36-48 hours after symptom onset.

ObjectiveTo investigate the clinical application value of enzyme-linked immunosorbent assay (ELISA) and time-resolved fluorescence analysis(TRFIA) and latex immune chromatography (GICA) in detecting hepatitis B serum markers.MethodsOne hundred and forty-five suspected patients of hepatitis B were detected serum markers of hepatitis B by ELISA,TRFIA and GICA method,and the results were compared and analyzed.ResultsWhen TRFIA method was as gold standard,the positive coincidence rate of ELISA and GICA method in HBsAg,HBeAb,HBcAb was 71％ (57/80),45％ (36/80),and in HBsAb,HBeAb,HBcAb was 33％( 1/3),0 (0/3),and there were significant differences between two methods (P＜0.05 ) ; the others were no significant differences (P ＞ 0.05 ).There was significant difference in the sensitivity of HBsAg between ELISA method and GICA method (P ＜ 0.05 ),but there was no significant difference in HBsAb,HBeAg,HBeAb,HBcAb(P ＞ 0.05 ).There was no significant difference in the specificity of HBsAg,HBsAb,HBsAg,HBeAb and HBcAb between ELISA method and GICA method (P ＞0.05).There was significant difference in HBsAg among three methods(P ＜0.05),but there was no significant difference between ELISA method and TRFIA method (P＞0.05),and there was significant difference between GICA method and TRFIA method (P＜0.05).There was no significant difference in HBsAb,HBeAg,HBeAb and HBcAb among three methods (P ＞ 0.05 ); there was significant difference in both HBsAb and HBeAb positive among three methods (P ＜ 0.05),and there was significant difference between ELISA method,GICA method and TRFIA method (P＜ 0.05).ConclusionTRFIA method has supreme measuring range,sensitivity and specificity supreme,but the price is higher;ELISA method is in the intermediate level of three methods and price is cheap,and it as well as TRFIA is suitable for the batch detection; GICA accuracy is low,but quick and simple,it is more suitable for the complement of the first two methods.

The design of DNA-based alphavirus vectors significantly improves the utility of these replicon vectors. The DNA-based replicon vectors can be used in expressing foreign genes and preparing RVP in virto efficiently, also in developing replicon vaccines and gene therapy vectors in vivo. The approach involved the conversion a RNA-based replicon vector into a layered DNA-based replicon vector by the RNA polymerase Ⅱ promoter and transcription termination/polyadenylation signal transcribed replicon RNA from DNA. When DNA-based alphavirus vector tranfected into cells, the first layer includes a eukaryotic RNA polymerase Ⅱ expression cassette that initiates transcription of RNA in nucleus. Following transport of this RNA from the nucleus to the cytoplasm, the second layer, autocatalytic amplification of the RNA vector corresponds to virus RNA replication cycle and results in high level expression of foreign gene. DNA and RNA-based bifunctional replicon expression vector pSCTA and helper vector pSHCTA were successfully constructed by replacing the SP6 promoter used in the original system pSFV1 and pSFV-helper2 derived from Semliki Forest virus (SFV) with CMV promoter and T7 promoter, and inserting BGH transcription termination and polyadenylation signal downstream 3′-untranslated region (UTR). In order to obtain DNA-based highly efficient replicon vectors, they were further modified to construct additional three DNA-based SFV replicon expression vectors and corresponding helper vectors. To investigate the efficiency of foreign gene expression level by the four different DNA-based SFV expression vectors and recombinant virus particle (RVP) prepared by cotranfecting with corresponding helper vectors, improved DNA-based replicon vectors pSCAR and pSHCAR derived from SFV were developed. high level protein could be generated using the new vector system by transfecting DNA into BHK21 cells and High titer of RVP produced by cotranfecting with helper vector. Antigen genes were also expressed in cells by the replicon expression vector. Additionally, reporter gene expression was observed in mice muscle following injection with SFV DNA vector. Anti-?-Gal antibody response and cell-mediated immune response were induced after intramuscular inoculation of the ?-Gal-encoding SFV replicon DNA. The results suggested that highly efficient DNA-based replicon vectors pSCAR and pSHCAR were constructed by modifying the SFV vectors. The improved DNA-based replicon vectors enhance the utility of them, and can be developed as potentially replicon vaccines and gene therapy vectors.

Objective: To investigate echocardiography characteristics and clinical significance in patients with diastolic mitral regurgitation. Methods: A total of 15 patients with diastolic mitral regurgitation were studied including 1 patient with large volume of aortic regurgitation, 6 with atrial ifbrillation (AF), 2 with atrial lfutter, 1 with II° type I atrio-ventricular block (A-V block), 1 with II° type II A-V block and 4 with III° A-V block. The characteristics of mitral regurgitation were observed, the heart rates, left ventricular size were measured and left ventricular function was detected in all patients. Results: There was 1 large volume aortic regurgitation patient with diastolic mitral regurgitation occurred in slow iflling phase with less volume, it was less than positive velocity; 1 AF patient occurred in mid and late diastolic phase with less volume, it was obviously less than positive velocity; the rest 8 patients all occurred in mid and late diastolic phase, the velocity reached or surpassed to positive velocity. All 15 patients had slow heart rate, increased left heart, decreased left ventricular ejection fraction, tissue Doppler imaging showed that the early diastolic peak slowed down in mitral ring. There were 93% (14/15) patients having obvious systolic regurgitation. Conclusion: The time phase, quantity and velocity of diastolic mitral regurgitation have various characteristics, most of them associated with systolic regurgitation combining abnormal cardiac structure and function. Echocardiography provides important information for clinical treatment.

Objective To investigate the serum anti-HBc level in patients with different natural history of chronic hepatitis B virus (HBV) infection and cirrhosis,and its clinical value for distinguishing the natural history statue.Methods A total of 160 patients with chronic HBV infection from March 2015 to June 2016 were enrolled,and they were divided into immune tolerance group (n=43),HBeAg-positive chronic hepatitis B (CHB) group (n=37),inactive carrier group (n=39) and HBeAg-negative CHB group (n=41).A total of 44 patients with HBeAg-positive cirrhosis and 46 patients with HBeAg-negative cirrhosis were enrolled too.The general conditions data were collected,and HBsAg,HBeAg,anti-HBc,HBV DNA load and HBV genotype were detected.The associations between anti-HBc level and clinical parameters were analyzed,and the diagnostic value of anti-HBc for distinguishing different natural histories was analyzed.Results The anti-HBc levels in different natural history from high to low were as following: HBeAg-positive CHB group (4.22±0.68)log10 IU/mL,HBeAg-negative CHB group (3.89±0.88)log10 IU/mL,inactive carrier group (3.07±0.68)log10 IU/mL and immune tolerance group (2.88±0.82)log10 IU/mL.The anti-HBc levels in HBeAg-positive and HBeAg-negative cirrhosis patients were (3.04±0.82) and (3.15±0.86) log10 IU/mL,respectively.In HBeAg-positive CHB group,the anti-HBc was positively associated with ALT (r=0.353,P=0.032) and AST (r=0.421,P=0.009).In HBeAg-negative CHB group,the anti-HBc was positively associated with HBV DNA (r=0.343,P=0.028),ALT (r=0.458,P=0.003) and AST (r=0.495,P=0.001).The AUC of anti-HBc used to distinguish immune tolerance from HBeAg-positive CHB was 0.903,and the AUC used to distinguish inactive carrier from HBeAg-negative CHB was 0.833.Conclusion Anti-HBc levels in different natural history of chronic HBV infection are significantly different,and anti-HBc could be used to distinguish the natural history statue of chronic HBV infection with a higher diagnostic value than HBsAg.

Objective To explore the immunogenicity of recombinant chimeric 6Aβ15-T including the Aβ1-15 epitope and a T-helper epitope formulated with different adjuvants and to evaluate its feasibility as a candidate vaccine for Alzheimer disease (AD).Methods The recombinant chimeric antigen 6Aβ15-T formulated with Al adjuvant, Freund′s adjuvant or MF59 adjuvant was administered to two strains of mice .The 6Aβ15-T-immunized group without adjuvants ( Mock) and non-immunized group (Control) were included in this study as control groups .The specific antibody and cellular immune response of the chimeric antigen were evaluated .Results In BALB/c strain mice, three types of adjuvants could substan-tially boost the immunogenicity of chimeric antigen 6Aβ15-T and produce a high level of specific-Aβ(β-amyloid) antibod-ies.In C57BL/6 strain mice, the existence of adjuvants enhanced the immune response of 6Aβ15-T antigen, but the mice in Mock group also produced a strong antibody response .In two strains of mice, prevalence of anti-AβIgG1, which was an indicator of Th2 polarization, was observed in the 6Aβ15-T-immunized mice.Additionally, the Al adjuvant induced a high-er level of IgG1 antibody titers, and the ratio of IgG1/IgG2a was the largest.As expected, the 6Aβ15-T antigen formulated with or without adjuvants induced PADRE-specific, but not Aβ42-specific T cellular immune response .Conclusion The 6Aβ15-T antigens formulated with different types of adjuvants could induce strong Th 2-polarized Aβ42-specific antibody re-sponses without activating self-reactive Aβ42-specific T cells in two strains of mice .The results suggested that the recombi-nant chimeric antigen 6Aβ15-T is a good candidate vaccine for AD .

Objective To explore the influence of visual searching training on attentional bias and stress response of athletes,in order to make guidance for their attention training before competition.Method Thirty-two athletes were given the visual searching training once every two days for 4 weeks.Before and after the training,the attention behavior of athletes was evaluated using the dot-probe task,and the stress response in stressful condition was evaluated using the rating of perceived exertion and heart rate variability(HRV).Result After the visual searching training,less stress,anxiety level and attention to negative information were observed in the stressful condition.Moreover,a decrease was also found in the ratio between low frequency and high frequency,and the low frequency normalized of HRV,while an increase was found in the high frequency normalized.Conclusion Visual searching training can lower the stress response and negative attentional bias for athletes in stressful condition.

Objective To implement and evaluate evidence-based guidelines for enteral nutrition support in acute stroke patients with dysphagia.Methods This study is a prospective before and after comparison study.Collected 200 acute stroke patients with dysphagia and divided them into test group (trained medical staffs) and control group(untrained medical staffs) equally according to the time order.Two groups of 100 patients were surveyed using a checklist before and after implementation of 10 guidelines about nutrition support.Before the implementation of guidelines,the staffs were enforced training,and summarized regularly.Compliances with guidelines by doctors and nurses were compared,and outcomes of patients were assessed.Results Compared with the control group,the correct implementation of the project significantly improved in the experimental group on nutritional risk screening (92.0％,64.0％; x2 =22.840),nutritional supplements selection (80.0％,48.0％; x2 =22.220),nutrition infusion methods (90％,18％ ; x2 =1.040) and nutrition infusion adjustment (abdominal distension/adjusted:21/10,6/4;x2 =9.634,constipation/adjusted:41/40,57/53 ; x2 =5.122,all P ＜ 0.05).The mortality rate,poor prognosis and length of stay in department of neurology intensive care unit and in hospital were not significant different between the experimental group and the control group.The incidence of hospital-acquired pneumonia was significantly lower in the experimental group (44.3％) than that in the control group (67.5％,x2 =7.281,P =0.007),but other patient outcomes were unaffected significantly.Conclusion Implementation of evidence-based guidelines for enteral nutrition support in acute stroke patients with dysphagia is associated with improvements in clinical quality and selected patient outcomes.

To investigate the cell-killing effect and its possible mechanism of rClone30-hDR5 in combination with TRAIL on human hepatic carcinoma (HCC) cell line, first of all, recombinant plasmid pee12.4-hDR5 was introduced into HepG2 cells by liposome transfection. After five rounds of screening by flow cytometry, HepG2 cells expressing high levels of DR5 on cell surface were isolated. The cytotoxicity of TRAIL to selected cells was higher than that of TRAIL to HepG2 cells by MTT method (P < 0.01). The result suggested that the cloned hDR5 gene had biological activity. MTT assay showed that, rClone30- hDR5 in combination with TRAIL more efficiently inhibited the tumor growth of HepG2 cells compared to rClone30-hDR5 or TRAIL in vitro. The results of Annexin V-FITC/PI staining and Quantitative Real-time PCR indicated that rClone30-hDR5 in combination with TRAIL significantly increased the mRNA levels of caspase 3 and caspase 8, and induced the apoptosis of tumor cells. HepG2 cells were infected with rClone30-hDR5 or rClone30 at MOI of 1. The expression of hDR5 on tumor surface increased significantly by rClone30-hDR5 compared to that by rClone30, which contributed to the sensitivity to TRAIL. In conclusion, rClone30-hDR5 in combination with TRAIL has potential application value in cancer treatment.