Dengue is the most wide-spread arthropod-borne viral disease of humans in the tropic and sub-tropic regions.In this study,genomic sequences of more than 3 000 dengue viruses available in the GenBank were aligned and analyzed by sero type.According to phylogenetic trees generated by the minimum evolution method of MEGA5.0,dengue viruses were divided into 4-6 genotypes within the four serotypes,respectively.Meanwhile,it was indicated that the distribution of most genotypes was associated with geographic origins of dengue viruses.Probable origins for most of the 39 strains from China with genomic sequences were deduced from relevant ancestral strains in the context of ME trees.These results revealed that the genotype distribution of dengue viruses was geographic origin-specific at genomic level,and that diverse introduction sources were attributed to dengue outbreaks in China.

Objective To investigate the approaches for diagnosis and treatment of intrahepatic cholangiocarcinoma(ICC)and asgess its prognosis factors.Methods The clinical data of 86 patients with ICC in our hospital from January 1995 to December2005 were retrospeetively analyzed.All patients were divided into two groups according to the treatment method,including hepatectomy and lymphatic clearance group(Group A,n=42)and hepateetomy group(Group B,n=44),and their clinicopathological variables were analyzed.Resuits The 1-,3-and 5-year survival rates were 77.81%and 35.21%,20.93%and 19.82%,2.31%and 0%respectively between group A and group B.There was significantly difference between these two groups(P＜0.01).The analysis showed that resection and lymphatic clearance were correlated to prognosis.The 1-,3-and 5-year survival rates were 59.21%,26.21%,and 20.11% respectively in 47 patients who were found no lymph node metastasis,and the 1-,3-and 5-year survival rates were 19.82%,2.31%and 0% respectively in 39 patients who were found lymph node metastasis.There was significantly difference in survival rate between group A and group B(P＜0.01).Condusions Reseetability and lymphatic clearance are two significant factors correlated to survival of the patients with ICC.Aggresgive treatment of lymph node metastasis in hepatoduodenal ligament is an important strategy to improve survival rates and strengthen patient's life quality.

Objective To explore the correlation between up-regulation of cyclooxygenase-2(COX-2) (expression) and hepatocellular carcinoma(HCC) angiogenesis.Methods The expression of COX-2,vascular endothelial growth factor(VEGF)、basic fibroblast growth factor(bFGF) and angiopoientin-2(Ang-2) were examined in eighty matched sets of HCC specimens using immunohistochemistry and reverse (transcription-polymerase) chain reaction(RT-PCR).Results In HCC,the expression rate of COX-2,VEGF,bFGF and Ang-2 was 75.0%,62.5%,60.0% and 61.25%,respectively.(Immunohistochemical) staining scores of VEGF、bFGF and Ang-2 were 5.98?1.16,4.57?0.26 and(5.87)?0.12,respectively in strongly postive group of COX-2;and were 3.30?0.22,2.61?0.16 and 2.63?0.13,respectively in moderately weak postive group of COX-2.The expression rates of VEGF,(bFGF) and Ang-2 were 100.0%(95/95),94.29%(33/35) and 97.14%(34/35),respectively in strongly postive group of COX-2;and were 60.0%(15/25),60.0%(15/25) and 60.0%(15/25),respectively in moderately weak postive group of COX-2.There was significant difference in HCC(angiogenesis) between the two groups(P

AIM: To study the possible molecular mechanism of beta-amyloid peptide_ 1-40 -induced apoptosis in rat cortical neurons. METHODS: 40 mg/L beta-amyloid peptide_ 1-40 (A?_ 1-40 ) was used to induce apoptosis in cultured rat cortical neurons. The level of CDK4, phosphorylated pRB were detected by flow cytometry and immunoblotting; RT-PCR was used to examine the mRNA expression of E2F1 while fluorescent spectrofluorometer was used to measure caspase-3 activity. All of the above study was designed to observe whether the level of CDK4, phosphorylated pRB and E2F1 mRNA expression could be affected by A?_ 1-40 . RESULTS: (1)The level of CDK4, phosphorylated pRB increased markedly 2-4 hours after treatment with A?_ 1-40 , and caspase-3 activity elevated remarkably 12-24 hours after treatment with A?_ 1-40 ; (2) E2F1 mRNA expression was upregulated 3 hours after incubation with A?_ 1-40 . CONCLUSION: A?_ 1-40 may induce apoptosis in rat cortical neurons in a manner dependent on CDK4-pRB-E2F1 pathway.

[ ABSTRACT] AIM:To investigate the effects of microRNA145 ( miRNA145 ) on the viability, apoptosis, inva-sion and metastasis of hepatoma HepG2 cells.METHODS: HepG2 cells were randomly allocated into 3 groups: blank control group, empty mimic transfected group and miRNA145 mimic transfected group.Under the induction of Lipofectami-neTM 2000, the recombinant was transfected into HepG2 cells.After transfection, the expression level of miRNA145 was detected by real-time PCR.The protein level of N-cadherin and the mRNA expression levels of miRNA145 and N-cadherin were detected by Western blot and real-time PCR.The cell viability was detected by MTS assay.The cell cycle and apopto-sis were analyzed by flow cytometry.Invasion and metastasis were detected by Transwell assay.RESULTS:Compared with negative control, miRNA145 expression was up-regulated significantly, while the expression of N-cadherin was down-regu-lated significantly.Meanwhile, the cell viability, cell cycle, apoptosis, invasion and metastasis of hepatoma HepG2 cells were all significantly inhibited (P<0.05).CONCLUSION:miRNA145 dramatically inhibits viability, apoptosis, inva-sion and metastasis of hepatoma cells.

Objective:To evaluate the effect of ladder teaching of problem-based learning (PBL) after theoretical lecture in the standardized training of ophthalmology.Methods:This study collected the data of the resident trainees in the ophthalmology standardized training base of the PLA General Hospital from September 2015 to June 2020. According to the accepted teaching methods, they were divided into the ladder teaching method group (ladder group) and the pure PBL teaching method group (PBL group). The exam results of the first and second stages of the trainees, the pass rate of the first stage exam (ophthalmology theory), the pass rate of the second stage exam (clinical application), and the overall pass rate of the first and second stages were recorded for statistical analysis. Quantitative evaluation on the teaching effect of the "ladder teaching method of theory teaching followed by PBL" in the standardized training of ophthalmology in this training base was made. SPSS 24.0 was used to conduct t-test, rank-sum test and Chi-square test. Results:The results of the first stage examination (ophthalmology theory) in the ladder group were higher than those in the PBL group [(87.22±8.45) vs. (74.47±10.68)], with a statistically significant difference ( P < 0.01); the pass rate of the first stage examination (ophthalmology theory) in the ladder group was higher than that in the PBL group (95.83% vs. 85.00%), with no significant difference ( P = 0.213). The pass rate of the second stage examination (clinical application) in the ladder group was higher than that in the PBL group (95.65% vs. 76.47%), with no significant difference ( P = 0.070); the overall pass rate of routine training (first and second stages) in the ladder group was higher than that in the PBL group (91.67% vs. 65.00%), with a statistically significant difference ( P = 0.029). Conclusion:The ladder teaching of PBL after the theory teaching has a satisfactory effect in the standardized training of ophthalmology. This teaching method is easier to help the students to successfully complete the standardized training and pass the standardized training examination.

Objective To evaluate the efficacy of tinnitus retraining therapy (TRT) on anxiety , depression , and symptoms of sleep disorders in patients with chronic subjective tinnitus. Methods Eighty patients with chronic subjective tinnitus visiting The Affiliated Hospital of Hangzhou Normal University from January 2016 to December 2017 were recruited ,and were divided into an observation group and a control group through computer generated random numbers. Patients in the control group were given drug treatment only ,while those in the observation group received TRT in addition to drug treatment. Clinical efficacy was evaluated using Tinnitus Handicap Inventory (THI) , Pittsburgh Sleep Quality Index (PSQI) ,Hamilton Depression Scale (SDS) ,and Hamilton Anxiety Scale (SAS ) for both groups. Results Patients in the observation group were associated with significantly lower scores of THI ,PSQI ,SAS and SDS ,compared with those in the control group 3 months after treatment (each P＜0.05). Furthermore ,the effectiveness rate was markedly higher (82.5% or 33 cases vs. 55.0% or 22 cases ,χ2＝7.040 ,P＜0.01) in the observation group than in the control group 6 months after treatment. Conclusion Tinnitus retraining therapy combined with conventional therapy can help to reduce the severity of tinnitus handicap ,ameliorate negative emotions such as anxiety and depression ,and improve sleep quality in patients with chronic subjective tinnitus.

Objective:To explore the characteristics and associations of symptoms among freshmen in high vo-cational education with varied levels of mental health state.Methods:A sample of 3 601 freshman students from a vocational college in Zhejiang province was chosen to evaluate their mental health state by the University Personali-ty Inventory(UPI).Based on network analysis method(NAM),the core symptoms associated with various levels of mental health state were analyzed by using the Ising model,cross-network comparisons were conducted by using the Network Comparison Test(NCT).Results:Among students who might have severe psychological problems,the strongest association was found between low self-esteem symptoms,with the core symptoms primarily concerning e-motions and interpersonal issues(egde=1.36).Among students who might have mental block,the strongest associ-ation was between social avoidance symptoms,with the core symptoms mainly linked to low self-esteem(egde=1.89).NCT revealed that there were no significant differences in general strength(P＞0.05)among vocational col-lege freshmen at different mental health state.However,there were significant differences in network structures(P＜0.001).Conclusion:In varying levels of mental health,symptoms among higher vocational college freshmen are primarily characterized by interpersonal emotional issues with low self-esteem,and interpersonal avoidance issues with low self-esteem.The students who may have severe psychological problems would have closer network con-nections.

Objective To set up a computer-assisted polyp detection system under colonoscopy,and to preliminarily verify its effectiveness.Methods Based on Faster R-CNN algorithm and the open source implementation of the open source framework tensorflow and Faster R-CNN,a computer-assisted polyp detection system under colonoscopy was constructed.According to the size and difficulty of the training set,five test groups were set up:test group one,two,three and four contained 1 000,2 000,4 000 and 6 000 training samples,respectively.Test group five increased the probability of selecting the difficult samples based on 6 000 training samples.In different training sets,the sensitivity,specificity,other classification evaluation parameters,and the evaluation parameters of target detection such as recall and precision of this polyps detection system were calculated.Results Classification evaluation parameters showed that the sensitivities of test group one,two,three,four and five were 90.1％,93.3％,93.3％,93.3 ％ and 93.5 ％,respectively,and the difference was statistically significant (x2 =25.324,P＜0.01).The sensitivities of test group two,three,four and five were all higher than that of test group one,and the differences were statistically significant (x2 =13.964,13.508,13.508 and 13.386,all P＜ 0.006 25).There were no significant differences in specificity and positive predictive value among test groups (both P＞0.05).The negative predictive values of test group one,two,three,four and five were 90.4％,93.3％,93.3％,93.3％ and 93.5％,respectively,and the differences were statistically significant (x2 =21.862,P＜0.01).The negative predictive values of test group two,three,four and five were higher than that of test group one,and the differences were statistically significant (x2=11.447,11.564,11.755,13.760;all P＜0.006 25).As the training sample size increased from 1 000 to 2 000,the area under curve (AUC) increased by 2％,and further increased the sample size to 6 000,AUC increased by less than 1 ％.At this point maintaining the same sample size while increasing the proportion of difficult samples,AUC increased by 0.4％.The results of evaluation parameters of target detection showed that the recall rate of each test group was 73.6％,79.8％,79.5％,79.8％ and 83.3％,respectively,and the differences were statistically significant (x2 =71.936,P＜0.01).Among them,the recall rates of test group two,three and four were higher than that of test group one,and the differences were statistically significant (x2 =25.960,23.492 and 25.960,all P＜0.006 25),and the recall rate of test group five was higher than those of test group one,two,three and four,and the differences were statistically significant (x2=67.361,9.899,11.527 and 9.899;all P＜0.006 25).In addition,the precision rates of test group one,two,three,four and five were 87.9％,85.3％,90.2％,91.4％ and 89.2％,respectively,and the difference was statistically significant (x2=48.194,P＜0.01).The precision rates of test group three and five were higher than that of test group two,and the differences were statistically significant (x2 =24.508 and 15.223,both P＜0.006 25),and the precision rate of test group four was higher than those of test group one and two,and the differences were statistically significant (x2=13.524 and 39.120,both P＜0.006 25).As samples size and training difficulty increased,the values of F1-score and mean average precision increased steadily.Conclusions This study initially constructed a computer-assisted polyp detection system under colonoscopy.Currently the maximum sensitivity reached 93.5％,and the maximum recall rate reached 83.3％.Increasing the training set size may improve the polyp detection result to a certain degree,however it will reach a bottleneck.At this time,increasing the training difficulty can further improve the detection scores,especially the recall rate.

Objective To investigate the value of heparin-binding protein(HBP) in predicting urosepsis after endoscopic lithotripsy for upper urinary tract stones.Methods From January to November 2018,635 cases of upper urinary tract stones treated by endoscopic lithotripsy in our hospital was analyzed.According to the 2014 edition Chinese Guidelines of the diagnosis and treatment of urosepsis,all patients were divided into two groups,the definite urosepsis group (n =53,8.3％) and the no urosepsis group (n =582,91.7％).The serum of HBP level was detected by fluorescence immunoassay technology.The serum of procalcitonin (PCT) level was detected by cyclic enhanced immunofluorescent assay.C-reactive protein (CRP) level was detected by automatic chemiluminescence immunoassay analyzer.White blood cells (WBC) count was performed by hematology analyzer.Receiver operating characteristic(ROC) curves were constructed by SPSS 22 and MedCale,and areas under curves (AUC) were calculated and compared to illustrate the diagnostic power of HBP,PCT,CRP and WBC.The correlation between HBP and WBC was also significant (r =0.68,P ＜ 0.05).Results The level of HBP,PCT,CRP and WBC were significantly higher in the definite urosepsis group compared to the no urosepsis group.AUC of HBP,PCT,CRP and WBC were 0.930,0.878,0.727 and 0.617.When the cutoff of HBP,PCT,CRP and WBC were set as 51.5 ng/ml,0.41 ng/ml,64.2 mg/L and 11.7 × 109/L,the sensitivities were 89.2％,83.3％,83.5％ and 44.7％,and the specificity were 95.9％,75.6％,64.3％ and 77.1％,respectively.Conclusions The value of heparin-binding protein was superior to that of PCT,CRP and WBC in predicting urosepsis after endoscopic lithotripsy for upper urinary tract stones.Heparin-binding protein could be acted as a diagnostic marker for urosepsis.