Virtual reality simulators and surgical demonstration were used in laparoscopic teaching combining teacher' guiding with students' practice to improve the teaching effectiveness hecause of the limitations of the traditional apprenticeship teaching methods.The new method was applied for 2 cycles and for 6 weeks.The results showed that the teaching methods of virtual reality simulators combined with surgical demonstration can significantly improve the effectiveness of laparoscopic teaching and shorten the initial learning curve,therefore it is worth promoting in laparoscopic operation training and teaching.

Objective To investigate the killing effect of polymethylmethacrylate (PMMA) on spinal metastasis of transplanted VX2 carcinoma in experimental rabbit models. Methods Spinal metastasis of transplanted VX2 carcinoma model was successfully established in 18 rabbits. The experimental rabbits were randomly and equally divided into three groups with 6 rabbits in each group. Under CT guidance , PMMA or saline was injected into the center of VX2 tumor; in group A 0.3 ml of PMMA was used, in group B 0.1 ml of PMMA was used and in group C (control group) 0.3 ml saline was used. Twenty-four hours after the injection, the animals were sacrificed. Four tissue samples were obtained from the sites at 1 mm , 5 mm, 10 mm and 15 mm away from the PMMA mass in each rabbit of group A and group B , while four tissue samples were collected from different four sites from the tumor ’s center to border in each rabbit of group C. TdT-mediated dUTP nick-end labeling (TUNEL) method was used to determine the tumor cell apoptosis rate. Results After successful establishment of rabbit model, injection of PMMA was performed in sixteen among the eighteen rabbits. Technical success rates were 83.3% in both group A and B, and the success rate was 100% in group C. The difference in technical success rate was not significant. The mean tumor cell apoptosis rates of spinal VX2 carcinoma at 1 mm, 5 mm and 10 mm away from the PMMA mass in group A were (65.75±18.81)%, (50.00±14.24)% and(14.95±8.98)% respectively. The mean apoptosis rate in the control group was (9.79 ±5.24)%; the differences between the group A and the control group were statistically significant (P<0.05). The mean tumor cell apoptosis rate of spinal VX2 carcinoma at 15 mm away from the PMMA mass in group A was (10.30 ±8.13)%, which was not significantly different with that of the control group. The mean tumor cell apoptosis rates of spinal VX2 carcinoma at 1 mm and 5 mm away from the PMMA mass in group B were (49.20±15.57)% and(17.75±9.28)% respectively, which was significantly different with that of the control group(P<0.05); the mean tumor cell apoptosis rates at 10 mm and 15 mm away from the PMMA mass in group B were not significantly different with those of the control group. Statistically significant differences in the mean tumor cell apoptosis rates determined at 1 mm, 5 mm and 10 mm away from the PMMA mass existed between group A and group B(P<0.001). Conclusion PMMA can promote the apoptosis of tumor cells, properly increasing the injected amount of PMMA can enlarge the extent of tumor cell apoptosis.

Objective To study the effective composition of Aster ageratoides Turcz for relieving asthma and its toxicity . Methods Seventy‐two qualified male guinea pigs ,body mass(300 ± 20)g ,were randomly divided into the control group ,aminophyl‐line group(0 .047 g/kg) and different ratio group of total saponins and total flavonoids (8∶1 ,4∶1 ,2∶1 ,1∶1 ,1∶2 ,1∶4 ,1∶8) . Every group received at dose of 0 .38 g/kg once a day for 3 days by intragastric administration .The effect of relieving asthma was taken as the indicators for the optimization of compositions ,which was detected by observing the latent period of asthma induced by acetylcholine‐histamine in guinea rats .The relaxation percentage of smooth muscle retracted by acetylcholine was detected by Pow‐erlab biological signal collecting system when aminophylline(1 .25 mg/mL) and different matching drugs(0 .02 g/mL) were added in Krebs′solution .The acute toxicities of total saponins ,total flavonoids and mixture of total saponins with total flavonoids (ratio of 1∶2) were detected by classical acute toxicity test of mice .Results Compared with the control group ,aminophylline group ,each group latent period of inducing asthma significantly or very significantly prolonged (P<0 .05) ,among them ,1∶1 ,1∶2 ,1∶4 group and other matching group were significantly different(P<0 .05) ,but 1∶2 group cited the longest incubation period .Aminophylline group and the ratio could significantly relaxe guinea pig tracheal smooth muscle retracted by acetylcholine .Aminophylline group di‐astolic percentage was the largest(24 .12 ± 1 .20)% ,all the groups were less than the percentage of diastolic aminophylline group (P<0 .05) ,but in 1∶2 group with the closest .Aster ageratoides Turcz ,tatarian aster total saponins ,total flavonoids and the ratio of 1∶2 to mice maximum tolerance was respectively 300 ,345 ,325 g/kg .Conclusion For the same total dosage ,the relieving asth‐ma effects of proportions of 1∶2 Aster ageratoides Turcz were obvious .There are no abnormal changes in the acute toxicity trila with total flavonoids ,total saponins ,as well as the ratio of 1∶2 ,safety is relatively good .

Objective To evaluate prourodynamic study and somatosensory evoked potentials(SEPs)before and after operation of children with lipomyelomeningocele(LMMC)and its clinical significance.Methods Urodynamic study(UDS)and SEPs in 31 cases of LMMC who underwent microsurgical release within 1 week preoperatively and 3 months postoperatively were conducted.The 4 parameters used for UDS evaluation were bladder volume,compliance,detrusor activity and residual urine;parameters used for SEPs evaluation were latent period and amplitude.Results There was a statistics significant difference between operation and control group;the similar result was attented in the comparison of before and after operation,also in the comprison of the improved group and the group without improvement after operation.Conclusions UDS and SEPs investigation can provide guidance for the treatment of tethered cord syndrome(TCS)and evaluate clinical prognosis.These cases with the severity changing in UDS and somatosensory shall be avoided unnecessary action in operation.

Objective To study the inhibition effects of antibacterial proteins from Musca domestica larvae on JEC and A375 tumour cells. Methods Antibacterial proteins with concentrations of 0.02%,0.1%,0.5%,2.5% and 12.5% were supplied in the culture of JEC and A375 tumour cells in vitro.The cell cycles and apoptosis of JEC and A375 tumour cells were detected by flow cytometry,and the apoptosis index(AI) was measured.The morphology of apoptotic cells was observed with HE stainings and AO staining.The culture without antibacterial proteins was served as control. ResultsThe ratio of apoptosis index/proliferation index(AI/PI) of JEC cells increased with the concentration of antibacterial proteins.The PI and apoptosis rate of 2.5% antibacterial proteins group and 12.5% antibacterial proteins group significantly increased,and G0/G1 significantly decreased.For A375 cells,there were significant differences in G2/M, S,G0/G1,G2/M,AI/PI and PI between 12.5% antibacterial proteins group and control group(P

Objective To construct recombinant adenovirns containing small interfering RNA (siRNA) targeting human VEGF-C mRNA,then to study the inhibitory effects of adenovirus-mediated VEGF-C siRNA on growth and lymphangiogenesis of human colon cancer in BABL/c nude mice model.Methods In vitro:the specific siRNA sequence targeting human VEGF-C mRNA was selected.The homologous double-strand DNA was designed and synthesized.After such DNA was inserted into pDC316-EGFP-U6 by BamHI and HindⅢ,pDC316-VEGF-C siRNA-EGFP-U6 was obtained,then it was co-transfected into 293 cells with the hone plasmid pBHGF35.After generated by homologous recombination,Ad5F35-VEGF-C siRNA-EGFP-U6 was obtained,and it was packaged and amplified in 293 cells.The human colon cancer model was established in nude mice by hypo-injection LoVo cells.They were divided randomly into four groups (n=6):adenovirus,virus without target gene,single siRNA and PBS control group.Injecting intervention intra-tumorly in each groups,calculating the tumors volume and drawing the growth curve,calculating micro-vascular density (MVD) and micro-lymphatic density (LVD) by staining respectively of the lymphatic and vascular with anti-LYVE-1 monoclonal antibody and anti-CD<,34> monoclonal antibody were completed.Results Adenovirus group tumor sizes were smaller than other groups.The LVD were 8.47±2.1 and 17.35±4.7 (P<0.05) in adenovirns group and the PBS control group.The MVD were 22.65±6.04 and 23.19±7.63 (P>0.05) in adenovims group and the PBS control group respectively.Conclusion The adenovirus-mediated VEGF-C siRNA can significantly inhibit the growth and lymphangiogenesis of human colon cancer in nude mice model,hut have no effect on microangium vessels growth.

0.05). Dysphasia resolved significantly after stent placement in both groups.The improvement of dysphasia was more significant in Group A than in Group B after 2 months of stent placement(1.37?0.56 in group A, 1.82?0.50 in group B,P=0.004).The median survival period was longer in Group A than in Group B (7 months vs 4 months).The mean survival period was also longer in Group A than in Group B (8.3 months vs 3.5 months).There was a statistically significant difference in the survival period between the two groups(P

OBJECTIVETo evaluate the clinical efficacy of autologous semitendinosus and gracilis tendon grafting with anchor repair for the treatment of chronic achilles tendon rupture and severe scarring.

METHODSFrom April 2010 to October 2012,26 patients with chronic achilles tendon rupture(with Myerson type III ) and severe scarring were treated with autologous semitendinosus and gracilis tendon grafting with anchor repair. There were 19 males and 7 females,with an average age of 32 years old (ranged, 22 to 47 years). The time from injury to surgery was from 3 to 12 months (7 months on average). The plantar flexion strength of all injuried feet attenuated and single heel rise test were positive in 26 cases before operation. Plaster immobilization and routine rehabilitation therapy were performed after operation. Clinical effects were evaluated by Arner-lindholm criterion and complications were observed after operation.

RESULTSAll the patients were followed up from 12 to 24 months with a mean of 16 months. No complications such as achilles tendon re-rupture, wound infection, etc were found during follow-up period. According to the Arner-Lindholm standard, 15 cases got excellent results and 11 good.

CONCLUSIONUsing autologous semitendinosus and gracilis tendon grafts with anchor repair to treat chronic achilles tendon rupture and severe scarring is a perfect surgical procedure.

Achilles Tendon ; injuries ; surgery ; Adult ; Chronic Disease ; Cicatrix ; surgery ; Female ; Follow-Up Studies ; Humans ; Male ; Middle Aged ; Rupture ; Young Adult

Objective To evaluate the relationship between sevoflurane-induced cognitive decline and α1A norepinephrine receptor (ADRA1A) in the cerebral cortex of rats.Methods Forty-eight cleangrade healthy adult Sprague-Dawley rats (24 male,24 female),weighing 220-260 g,aged 3-4 months old,were divided into 2 groups (n =24 each) using a random number table method:control group (group C) and sevoflurane group (S group).Group S inhaled 3％ sevoflurane for 5 h.Rats underwent the Barnes maze test on days 1 and 7 after anesthesia.Rats were sacrificed immediately after anesthesia and on days 1 and 7 after anesthesia,and the cerebral cortex was removed for determination of the expression of ADRA1A protein and mRNA (by Western blot or fluorescent quantitative real-time polymerase chain reaction).Results Compared with group C,the number of entering incorrect holes was significantly increased,and the latency of entering the target hole and the distance were prolonged,and the expression of ADRA1A protein and mRNA in cerebral cortex was down-regulated at each time point in group S (P＜0.05).Conclusion The mechanism of sevoflurane-induced cognitive decline is related to down-regulated expression of ADRA1A in the cerebral cortex of rats.

Objective To study the significance of DNA of Toxoplasma gondii in peripheral blood. Methods DNA of T.gondii in peripheral blood of 50 infected rats was detected by polymerase chain reaction. A pair of primers was designed, according to the sequence P30 gene specific to T.gondii, to amplify DNA from T.gondii by PCR. Results The primers amplified DNA specifically from T.gondii and could not amplify DNA from humans, uninfected rat and mouse and from Trichomonas vaginalis and Entamoeba histolytica. DNA of two Toxoplasma parasites was detected by 35 cycles of amplification, indicating a fair sensitivity of the PCR system. Conclusion PCR may have a value for early diagnosis of T.gondii infection in rat.