Dioxin,as a kind of strong carcinogenic substance,a kind of environment hormone with tremendous harm,can get into human body through food chain and accumulate in fat of animals and persons,forming serious threat to human health. Dioxin has been included in the list of monitoring objects in food part of the global environment monitoring program as a new environmental pollutant by World Health Organization. In this paper,the toxicity,the source of dioxin and its impact on human health and prevention and control measures are introduced.

Objective:To explore relationship amongpersonality,family interpersonal dynamics and college students'adaption.Methods:Adaption to college was assessed with the Symptom Checklist 90 (SCL-90)in internet when 1850 freshman selected conveniently from a university in Shanghai (Students with single factor score of SCL-90 equal or greater than 2.5 belonged to the positive group,while the other students with single factor score of SCL-90 all less than 2.5 belonged to the negative group).At the same time,they were evaluated with the Cattell's 16 Personality Factor(16PF)to evaluate their characteristics and Multi-Interpersonal Dynamics Questionnaire for Un-dergraduates (MIDQ-U)for undergraduate students to assess family interpersonal dynamics.Results:The scores of anxiety of 16PFwere higherin the positive groupwith 50 students than in the negative group[(7.2 ±1.4)vs.(4.6 ± 1.9),P <0.001 ],while the scores of extroversion,serenity and alertness of 16PF were lower in the positive groupthan inthe negativegroup.In the SCL-90 positive group,the MIDQ-Uscores of indifference and submissivenesswere higher[(17.3 ±6.0)vs.(14.9 ±4.2),(11.5 ±3.2)vs.(10.3 ±3.1);P <0.001]and the scores of indepen-dencewere lower than that in the positive group[(18.7 ±3.0)vs.(19.8 ±3.4),P =0.02].Path graphanalysiss-howed that anxiety and extroversionpartly predicted freshmen's adaption directly(β=0.57 --0.01 )and partly worked through indifference(β=0.031 --0.004),while decisivenesscompletely functioned through indifference with the coefficient of 0.008.Anxiety had part mediating effect between indifference and freshmen's adaption(β=0.008).In the other three factors,anxietyplayedcompletemediatingrole.Conclusion:Personalities and family inter-personal dynamics may affect each other,then mutually predictstudents'adaption to college.

OBJECTIVE:To investigate the effect of liposome formulation in promoting hepatocytes' uptake of tenofovir and cytotoxic effect. METHODS: The tenofovir cationic liposomes were prepared by tert-butyl lyophilization, and its encapsulation efficiency and physico-chemical property were determined. Using human hepatic carcinoma cells SMMC-7721 as a model to investigate the effect of liposome formulation in promoting hepatocytes' uptake of tenofovir. MTT assays were used to examine the toxicity of tenofovir cationic liposomes in different conditions. RESULTS: The prepared tenofovir cationic liposomes had an encapsulation efficiency of (88.3?1.6)%, a size distribution of (278.4?67.6)nm and a Zeta potential of (31?5)mV. The results showed that the liposome formulations containing galactose and PEG modifying lipids resulted in significantly higher and prolonged drug accumulation inside cells as compared with free drugs. The cell survival rates were above 80% when the tenofovir liposome was at a concentration of 7.5?g?mL-1 and lipids at a concentration of 30?g?mL-1, and little toxicity was noted. CONCLUSION: The prepared cationic liposome can greatly enhance hepatocytes' uptake and protection of tenofovir, which is expected to become a highly effective drug delivery system of antiviral drugs such as tenofovir etc.

Objective To explore family functioning and related factors in anxiety disorder(AD)adoles cents.Methods 84 adolescent patients with AD and 124 controls without mental disorder matched by gender,age,and residential township were assessed with Family Adaptability and Cohesion Scale(FACES-Ⅱ),Family Assessment Device.Chinese version(FAD-CV)and demographic questionnaires.Results There were statistical differences between case and control groups in family economic conditions(P<0.05).There was lower family cohesion in AD group(64.82±9.63)than that in the control group(69.72±8.91);the scores of communication,emotional involvement and behavioral control were higher in AD group((2.34±0.45),(2.52±0.44),(2.46±0.32))than that in controls((2.12±0.34),(2.36±0.42),(2.24±0.24)),all P<0.05.Logistic regression analysis showed that better family economic condition(OR=0.784;95%CI:1.459-3.396)and higher cohesion of family(OR=0.969;95%CI:0.942～0.998)were protective factors for AD,while over-strict behavioral control (OR=2.181;95%CI:0.993～2.441)was a risk factor for AD.Conclusion There are different family functioning characters between AD and controls,and the intimacy relationship and suitable behavior control in family may improve the mental health of adolescents.

Objective To investigate the effect of electro-acupuncture at Guanyuanshu, Xinshu, Neiguan points on cardiac function after acute myocardial ischemia in rabbits. Methods A total of 36 rabbits were randomly divided into a control group, a model group and a treatment group. Acute myocardial ischemia was induced with Jugular vein injection of pituitrin. At 10 min before modeling, 1 hour and 1 week after modeling, the levels of malondialdehyde (MDA) and creatine kinase(CK) were determined respectively, the cardiac function was assessed as the maximum rate of left ventricular pressure rise(dp/dtmax)and the peak left ventricular pressure (LVSP). Results After 1 week of treatment, the serum levels of CK and MDA in the treatment group reduced significantly(120.21±10.67 U/L, 21.35±2.04 mmol/L], compared to the model group (162.37±13.21 U/L, 30.13±2.75 mmol/L) (all P<0.05);the dp/dtmax and LVSP decreased percentage in the treatment group (20%±2.43%, 7.22%±0.97%) decrease significantly compared to the model group (31.5%± 4.14%, 12.19%±2.21%) (all P<0.05). Conclusion Electro-acupuncture of Guanyuanshu, Xinshu, Neiguan acupoints can significantly improve cardiac function after acute myocardial ischemia and protect against acute myocardial ischemia in rabbits.

Objectives To analyze the clinical and pathological characteristics of gastric submucosal tumors (GSMTs), and evaluate the safety and efficacy of endoscopic treatment for GSMTs. Methods 61 patients with GSMTs were selected from June 2014 to September 2012 by endoscopy and ultrasonography;they were all treated by endoscopic therapy; pathological examination was took in all removed tumors, the tumors which could be the gastric stromal tumor were furtherly examined by molecular biology technique of immunohistochemistry. Result In 61 cas-es, 39 cases are female patients, accounting for 63.93%;the tumors located at the stomach fund accounted for 52.46%(32/61), at the gastric corpus for 21.31%(13/61), at the gastric antrum for 11.48 %(7/61), at cardia for 14.75%(9/61); 10 cases were treated by Endoscopic submucosal dissection, 21 by endoscopic submucosal excavation, 27 by Endoscopic full-thickness resection, 3 by Submucosal tunnelling endoscopic resection; in all 61 cases, 2 were changed to laparoscopic treatment because one tumor was too big and broke the Serous and another was located at mucus Lake of gastric fund, 1 occurred postoperative bleeding and was treated by laparoscopy successfully, 1 oc-curred postoperative perforation and was treated by endoscopy successfully; after pathological and immunohisto-chemical analysis, 34 tumors were identified as gastric stromal tumor and all of them in risk classification were at very low risk, 11 were leiomyoma, 5 were lipoma, 3 were heterotopic pancreas, 5 were calcifying fibrous pseudotu-mor, 2 were inflammatory fibroid polyps, and 1 was angiomatous proliferation; gastric stromal tumor at gastric fundus account for 73.53 % (25/34), at gastric corpus for 11.76 % (4/34), at gastric antrum for 5.88 % (2/34) and at cardia for 8.82 %(3/34). Conclusion Most GSMTs are found in female and commonly lack of specific clinical symptoms;GMSTs are commonly located at gastric fund and most of them are gastric stromal tumors, vast majority of gastric stromal tumors in the risk classification are at very low risk;the endoscopic resection is a mini-invasive, safe and ef-fective treatment for GSMTs.

Objective:To study effect of tripterygium glycosides(TG)on T-lymphocyte subsets in rats with idiopathic thrombocytopenic purpura(ITP),and further to discuss the possible mechanism of TG in treating ITP.Methods:ITP animal model was established by intraperitoneal injection of exogenous anti-platelet–serum(APS).Sixty model rats were randomly divided into five groups:normal group,saline group,the high and low dosage of TG groups,prednisone group.Every rat was giving liquid medicine by intragastric administration one time per day for ten days 36 hours after the first intraperitoneal injection of exogenous APS.The changes of peripheral hemogram,the amount of megakaryocyte of bone marrow and T-lymphocyte subsets were observed.Results:In high dosage of TG group,the number of platelet count increased obviously,the number of megakaryocyte in bone marrow,CD8+and CD4+decreased,and CD4+/CD8+increased.Conclusion:High dosage of TG had obviously therapeutic effect on IPT rat,such as increasing platelet count obviously,reducing number of megakaryocyte in bone marrow obviously and ameliorating T-lymphocyte subsets.The mechanism may be related to regulating the cell immune function.

OBJECTIVE To know the bacterial distribution in the blood of septicemia patients and the characteristics of drug resistance.METHODS To train the blood in BD BACTEC 9050 full-automatic blood training system and to analyze it in the FOUTUNE IMS bacterial identification and hypersusceptibility analysis system of Fuxing Company.RESULTS The Gram-negative bacilli were in superiority with 64.9% of the total isolated bacteria.Then were the Gram-positive cocci,and Staphylococcus were the main.The Enterococcus and fungi were with a certain proportion.The drugs to which had relatively low resistance for the Gram-positive bacilli and the Gram-positive cocci were the carbapenems,the enzyme inhibitors and vancomycin.CONCLUSIONS The Gram-negative bacilli get priority in the blood bacteria in patients with septicemia during the last two years,the enterococci and fungi have a certain proportion.And the pathogenic bacteria have higher resistance clinically to antibacterial drugs.

Objective To evaluate the clinical efficacy and safety of injection azithromycin in the treatment of the acute bacteria pneumonia of infant. Methods A randomized controlled open trial was carried out. Erythromycin as a controll drug was compared the clinical efficacy and safety with azithromycin as a test drug. Results In azithro-mycin group,the clinical effective rate was 90.6% ;the fully recovered rate was 75.5%. While those of erythromycin group were 68.0% ,36.0% respectively. The incidence of adverse reaction was 9.3% and 30.4% respectively in two groups. Conclusion Injection azithromycin of new macrofides type is a kind of effective and safe anti-bacterial drug.

Common mental health problems from the perspective of prevention among medical stu-dents were discussed in this activity which was learning from the concept and method of PBL. Participants had to find the solutions themselves by small-group discussion so as to improve their mental health. Results showed that most participants confirmed the innovation, interest and intellectuality of this activity. Moreover, students could not only learn knowledge related to mental health, but also improve their friendship as well as communication skills which were beneficial to medical students' mental health.