Medical morality,especially dental ethical account is usually demonstrated by ethical theories,including theory of utilitarianism,deontology,and virtue ethics.In fact,the true purpose of medical education is to produce erudite and humane practitioners and medical researchers.The present study discussed the efficacy of dental ethical educations through clinical practical issues.

Bepridil hydrochloride(Bep) hydrochloride is a new , long - acting antianginal and antiarrhythmic agent. Through the observation of ∑ST.NST.and NQ of ECG or nitro blue tetrazolium chloride staining, we studied the effect of Bep on liga-tion of the left coronary artery in rabbits and the myocardial ischemia induced by isopre-naline in rats. The results showed that in the groups treated with Hep andpropranolol theisoelectric level was facilitated. ∑ST.NST, NQ, thecreatine phosphokinase values and the weight percentage of infarcted myocardium were decreased. The myocardial ischemic injury was decreased by histopathological stud-

Objective To investigate the expression and significance of ?-endorphin in hippocampus after high power microwave (HPM) radiation. Methods 50 male Wistar rats were sacrificed at 6h, 1d, 3d, 7d, 14d, 28 days after exposure to 12mW/cm~2 HPM imitational source radiation. The hippocampus was harvested, the characteristics of injury to the hippocampus and expression of ?-endorphin were evaluated by means of light microscope, EM, immunohistochemistry and image analysis. Results In the neutrons of hippocampus, mitochondrial swelling and myelin sheath confluence and dissociation were observed 6 hours after radiation, and mitochondrial swelling, cavitation, disruption of crista, concentration margining of chromatin, blurring of synaptic cleft, piling or evacuation of vesicles were observed 3 days after HPM radiation. The expression of ?-endorphin in cytoplasm of neurons was up-regulated continuously from 1 to 7 days, peaking at 7 days, restoring to normal level from 14 to 28 days after radiation. Conclusion HPM can produce injury to the hippocampus at histological and ultrastructural levels. The expression of ?-endorphin is up-regulated, and it might play an important role in the pathophysiological process of injury and repair in the hippocampus.

Excitotoxicity refers to a process of neuronal death caused by excessive or prolonged activation of receptors for the excitatory amino acids, which is related to the overload of intracellular calcium ([Ca2+]i) and mitochondrial depolarization. The well accepted hypothesis that Ca2+ plays a central role in neurotoxicity, and it mediated excitotoxicity is deeply involved in both acute and chronic neurodegeneration suggests that inhibitors of Ca2+ transduction, such as NMDA antagonists, might block the pathological process at an early stage and provide more effective protections.

Human immunodeficiency virus type 1 (HIV-1) viral infectivity factor (Vif), one of the accessory proteins, which is a small basic phosphoprotein, is essential for viral replication and pathogenesis. The best well-characterized function of Vif is its ability to neutralize the host cell antiviral factor, apolipoprotein B mRNA editing enzyme catalytic polypeptide like 3G (APOBEC3G), which makes the viral particles more infective. In addition, Vif can regulate the reverse transcription and the advanced stage of replication of the virus particle, as well as induce the termination of cell cycle at G2 stage and so on. The designed drug aimed directly at Vif can efficiently block the maturation and infectivity of HIV-1. In this review, the structure, function and especially the related inhibitors of Vif are reviewed.

Objective:To investigate the clinical significance of Her2 pathological expression in the breast and gastric cancer patients for providing a reference for cancer prevention. Methods: Selected surgical resection specimens of 60 diagnosed in advanced gastric cancer and 60 diagnosed with advanced breast cancer from March 2009 to May 2014 in our hospital,all specimens were given the Her2 pathological expression of immunohistochemical analysis and investigation the clinical and pathological data. Results: The Her2 positive expression rates in the breast cancer and gastric cancer specimens were 40. 0% and 36. 7%,respectively that compared to no significant difference (P>0. 05). The Her2 expression was not related to the cancer patient’s age,histological type,and there were sig-nificantly correlated to the TNM stage and lymph node metastasis ( P<0. 05 ) . Spearman correlation analysis showed that Her2 expression in the breast cancer and gastric cancer were significant positive correlation to the Survivin, Bcl-2 expression ( P<0. 05 ) . Conclusion:Breast cancer and gastric cancer patients have shown high pathological expression of Her2,and are related to the TNM stage and lymph node metastasis, it may be through inhibited the apoptosis regulating proteins involved in the pathogenesis and metastasis of tumors.

Objective To discuss the clinical efficacy of internal fixation assisted by thoracoscope in treatment of rib fractures.Methods The study enrolled 180 patients with rib fractures associated with thoracic deformity hospitalized from July 2010 to June 2013.Ninety out of the patients were operated on by thoracoscope-assisted internal fixation (operation group),and the remaining 90 fractures were treated non-operatively (non-operation group).Clinical markers recorded were duration of pain,time of ventilator use,hospital length of stay and complications.Patient mental health was measured with self esteem scale (SES).Patient mobility was evaluated at follow-up.Results Between operation and non-operation groups differences were observed in duration of pain [(3.1 ± 1.0)d vs (8.9 ± 1.2) d],time of ventilator use [(3.0 ± 1.0) d vs (4.8 ± 1.0) d] and hospital length of stay [(10.0 ± 1.1) d vs (15.8 ± 1.0) d] (P ＜ 0.01).SES in operation group was (28.3 ± 2.1) versus (24.4 ± 3.3) points in non-operation group (P ＜ 0.01).No major complications occurred in operation group,but there were 20 pleural effusion,15 severe thoracic collapse or deformity,14 lung infection,10 refractory chest pain and 2 upper limb dysfunction in non-operation group (P ＜0.01).Two patients presented mobility limitation in operation group,but 12 had evident loss of mobility in non-operation group (P ＜0.01).Conclusions Thoracoscope-assisted internal fixation is effective to accelerate the pace of recovery,relieve pains,reduce complications and thus can be a priority method for treatment of rib fractures.

Objective To evaluate the prognostic value of RAS association domain family 1A gene (RASSF1A) methylation in patients after hepatocellular carcinoma (HCC) hepatectomy.Methods A total of 260 patients with HCC who underwent hepatectomy were enrolled.HCC tissues and tumor adjacent tissues which were 2 cm away from the tumor edge of the patients were obtained.The clinicopathological data of patients were collected.The methylation of RASSF1A in HCC tissues and corresponding tumor adjacent tissues was determined by methylation specific polymerase chain reaction (PCR).The correlation between the expression rate of RASSF1A methylation and clinicopathological characteristics was analyzed by chi-square test.Log-rank test was performed to analyze the relation between RASSF1A methylation and overall survival rate.Univariate and multivariate Cox statistical techniques were used to identify the influence factors in the prognosis of HCC.Results Among 260 HCC tissues and corresponding tumor adjacent tissues,RASSF1A promoter hypermethylation was detected in 214 HCC tissues (82.3 ％) and 101 corresponding tumor adjacent tissues (38.8％),and the difference was statistically significant (x2 =102.824,P ＜ 0.01).There was no correlation between RASSF1A methylation and age,gender,liver cirrhosis,α-fetoprotein level,maximum diameter of tumor,Barcelona Clinic Liver Cancer (BCLC) stage,hepatitis B virus (HBV) infection,smoking and alcohol drinking (all P＞0.05).The 5-year overall survival rate of patients with negative RASSF1A methylation was 93％,while that of patients with positive RASSF1A methylation was 51 ％,and the difference in overall survival rate between the two groups was statistically significant (x2 =26.556,P ＜ 0.01).Univariate and multivariate Cox regression analysis indicated that liver cirrhosis,BCLC stage and RASSF1A methylation were the main influence factors in the death of patients with HCC after surgery (Wald=16.767,8.791,16.286; all P＜0.01).Conclusion RASSF1A methylation is not only one of the predictive factors of survival rate in patients with HCC after hepatectomy,but also an independent prognostic factor of HCC.

According to interactive teaching,Problem-based Learning (PBL),visual teaching and other theories,combining with the characteristics of medical practice teaching,the paper puts forward a set of informatization methods used for medical teaching and practice,verifies that the application of informatization technology to medical teaching can obviously improve the teaching efficiency and quality,and meanwhile proposes the follow-up construction contents,in order to provide reference for further development of informatization medical teaching.

Objective To investigate the cytotoxic effects and mechanism of PNP-CD chimeric gene vector originated from PNP/MeP-dR system on HCC cells. Methods The fusion suicide gene PNP-CD obtained by site directed mutagenesis technique was subcloned into pcDNA3.0 to construct a eukaryotic expression vector containing a chimeric gene, pcDNA3.0/ PNP-CD. After being identified by recombinant enzyme, PCR and subsequent sequencing, it was transfected into HepG2 cells by liposome-mediation method. The G418-resistant cellular clone with stable transfection of pcDNA3.0/PNP-CD, HepG2/PNP-CD was established by selection. The expression of PNP-CD gene was also verified by RT-PCR and Western blotting. The curve of cellular growth was assayed by Trypan blue exclusion. The cellular sensitivity of HepG2/PNP-CD to its specific prodrugs and its bystander effects were also assayed by MTT method. Results The chimeric gene, PNP-CD, was inserted into pcDNA3.0 correctly, and the stable expression of pcDNA3.0/PNP-CD in HepG2 cells was confirmed.This cellular clone was highly sensitive to its corresponding prodrugs. It was indicated that its bystander effects with the synergetic treatment of its specific prodrugs were substantially higher than those caused by the same vector with the administration of only a single prodrug, MeP-dR. Conclusion The bi-functional fusion suicide gene vector, pcDNA3.0/PNP-CD, yields powerful cytotoxic effects on HCC cells in the presence of the synergetic treatment of its specific prodrugs, which would be a high-performance therapeutic vector in gene therapy for liver cancer.