To adhere teaching contest was an effective way of improve the teaching skills of young teachers in colleges,and was very important in improving the teaching level of medical school. Based on the experience of training teachers though teaching contests,we gave some suggestions on teaching contest.

Objective:To evaluate the influence of the implant-supported porcelain bridges made from non-precious metals using spark erosion techniques, and to discuss the feasibility and details of making the implant restoration by spark erosion technique.Methods: The study included 12 patients ( 9 males and 3 females) with 92 units implant-supported non-precious porcelain bridge from Sep.2011 to Feb. 2013.All the patients received implant treatment in Department of Oral Implantology, Peking University School and Hospital of Stomatology.The total of 52 implants, were from Nobel Biocare implant system, Camlog implant system and Ankylos implant system.The implant analogs were connected in sequence with a copper wire to guarantee conductivity.The implant electrodes represented one electrode and the superstructure the other.During spark-erosion machining, the cast holding the implant electrodes and the prosthetic framework were moved toward one another, causing an electrical erosion of the protruding ele-ments.Results:After the spark-erosion machining, the minimum gap between the framework and abut-ment was 0.21 mm, which was two units bridge.The maximum was 2.59 mm, which was 11 units bridge with 6 implants.The average gap was 0.68 mm.After the spark-erosion machining, the bridge fitted well with the passive position stability.Conclusion: The method of making implant-supported non-precious porcelain bridge reduces costs on patients.Spark erosion has the potential to provide implant framework with an excellent fit.The patients are satisfied with the clinical results.

Objective To investigate the effects of continuous venovenous hemodiafiltration (CVVHDF) on plasma lipopolysaccharide (LPS),interleukin(IL) 1β,IL-4,high mobility group box 1 (HMGB-1) in multiple organ dysfunction syndrome (MODS) dogs,to explore the therapeutic mechnism of CVVHDF.Methods Dogs were subjected to hemorrhagic shock plus resuscitation and endotoxemia to establish MODS model,then they were randomly divided into 2 groups:CVVHDF group (n=6) and MODS group (n=6).After endotoxin injection completed,the CVVHDF group received CVVHDF treatment for 24 h; MODS group did not receive CVVHDF treatment.The LPS,IL-1β,IL-4,HMGB-1 levels in plasma and ultrafiltrate were measured at different time points(before operation,before intravenous infusion of endotoxin,0 h,3 h,6 h,9 h,12 h,18 h,24 h after intravenous infusion completion of endotoxin),then the sieving coefficient (SC) was calculated.Results Compared with MODS group,the LPS,IL-1β,IL-4,HMGB-1 levels in plasma were significantly decreased in the CVVHDF group at 9 h,12 h,18 h,24 h (P ＜ 0.05).Some concentration of IL-1β,IL-4 and HMGB-1 was detected in the ultrafiltrate,the SC for IL-1β,IL-4 and HMGB-1 was 0.60±0.12,0.83±0.11,0.70±0.09 respectively,and LPS could not be detected in the ultrafiltrate,its SC was 0.After treatment,the damage level of lung and renal had been significantly reduced in CVVHDF group.Conclusion CVVHDF can effectively reduce the levels of pro-inflammatory mediator and anti-inflammatory cytokine related to MODS,cut off the vicious circle of cytokine network and reduce the damage level of organism in the treatment of MODS.

BRICS has been dealing with the problem of increase in the number of the patients who require an-tiretroviral therapy and this therapy’s price-rise by promoting medicine to domestic production and reducing the impor-ted drug price. This paper reviewed the situation of BRICS HIV epidemic and prevention, anti-retroviral therapy drugs production and supply, drug security policy and strategy, and the following seven recommendations are straight forwarded to China based on the BRICS AIDS antiretroviral treatment coverage strategic comparison:(1) The estab-lishment of an ARV drugs co-ordination mechanism;(2) The reduction of the drug patent licenses while increasing the domestic generic drugs possibility;(3)Negotiations with the original research process of domestic pharmaceutical enterprises to obtain a voluntary license or speed up the technology transfer;(4) The use of antitrust laws to promote access to medicines for a voluntary license pharmacy localization; ( 5 ) If necessary, starting the compulsory medi-cines licensing to achieve localization;(6) Reducing the drug prices by bargain and negotiation;and (7) Strengthe-ning NGO built-in capacity.

Objective To evaluate the effect on treatment of multiple myeloma complicating femoral neck fracture by surgical intervention combined with drugs.Methods Twelve patients with multiple myeloma complicating femoral neck fracture were treated by cemented total hip arthroplasty femoral head shank.All of patients were received zoledronic acid treatment,at the same time,7 cases of them treated by MPT regimen (melphalan,methylprednisolone and thalidomide),3 by bortezomib combined with dexamethasone,and 1 by autologous peripheral blood stem cell transplantation.Results Twelve patients could tolerate surgery,postoperative pain was significantly reduced.Assessed by using Harris hip function score after 6 months operation,2 cases were excellent,7 cases were good,3 cases were common,excellent and good rate was 75％ (9/12).All patients were followed up for 8 months to 3 years,1 case of local recurrence after 13 months.1-year overall survival rate was 100％,2-year overall survival rate was 83％,and 3-year overall survival rate was 67％.Conclusions Multiple myeloma complicating femoral neck fracture,using bone cement in total hip arthroplasty femoral head shank to clear the local tumor lesions,receive reconstruction capability,rapid postoperative recovery,pain relief,and opportunities for further comprehensive treatments.The bisphosphonate can promote new bone formation and prevent further fractures.The surgical intervention combined with chemotherapy could relieve the symptoms,reduce tumor cell burden,improve quality of life and prolong survival time.

Objective To explore the effect of Acanthopanax senticosus injection (ASI) on brain multi-infract dementia rats. Methods Thirty-six male Wistar rats were randomly divided into 3 groups:control group, model group and ASI group. The multi-infract dementia rat models were set up by injecting mini-sludged blood in carotis internal arteries, learning and memory function of rats were determined by Morris water maze and Step-down test, the section of rat cerebral cortex and hippocampus were stained with haematoxylin eosin (HE). Results Compared with model group, latency in ASI group shortened significantly at 2nd,5th and 6th day, the distance shortened at 1st,2nd,5th and 6th day. The seeking tactics of ASI trgated rats improved in the Morris water maze test. The error times of ASI treated rats decreasd at 1st and 2nd day in Step-down test; ASI did not reduce significantly pathological changes of vascular dementia rats. Conclusion ASI has effect of treatment on multi-infract dementia rats.

Objective To explore the mechanism of therapeutic effect of Donepezil hydrochloride on Alzheimer's disease(AD) rats.Methods According to weight,36 rats were divided into normal group,model group and Donepezil hydrochloride group.AD rat model was set up by injecting D-galactose into abdominal cavity for seven weeks,learning and memory function of rats was determined by using Morris water maze and Step-down test.The section of rat cerebral cortex and hippocampus were stained with haematoxylin eosin(HE),and the effect of Donepezil hydrochloride was observed by detecting the MDA content and SOD activity in cerebral tissue.Results Compared with model group,latency and distance of Donepezil hydrochloride rats shortened on the fourth day and the fifth day,starting angle of Donepezil hydrochloride rats shortened on the fourth day and the fifth day in the Morris water maze test,error times of Donepezil hydrochloride rats decreased on the first day and the second day in Step-down test;MDA content in cerebral tissue of Donepezil hydrochloride rat was deceased(P

Objective To amplify natural killer (NK) cells in vitro and explore its killing effect on ovarian cancer cells.Methods (1) The separation of NK cells and identification.A total of 20 ml peripheral blood of one healthy volunteer was collected in Nov.2015,Peking University People's Hospital.The peripheral blood mononuclear cells of normal volunteers were isolated,cultured in vitro and amplificated cultivation for 14 days with K562 cells transfected and expressing interleukin 21 (IL-21-K562) as nourish cells.The number and dynamic state of the growth cells were monitored during the cultured process.Cells were harvested and counted after 14 days cultured.The NK cells phenotypes were detected by flow cytometry.(2) The killing effect of NK cells on ovarian cancer cells:the ratio of effector cells (NK cells) and target cells (ovarian cancer cells and its control) was 50∶ 1,20∶ 1,10∶ 1,5∶1 or 1 ∶ 1,NK cells killing effect on ovarian cancer cells was detected by the lactate dehydrogenase (LDH) release experiments.Results (1) The results of NK cells establishment and phenotypic characterization:the cells were induced in vitro for 14 days by amplification culture.With the extension of incubation time,the number of NK cells increased constantly,from 2.0× 107 on day 0 to 5.1 × 109 on day 14.Obvious amplification of the total number of cells were detected for 255 times.Living cells unstained by trypan blue eventually reached 95％ above.Before and after the induction and amplification in vitro,the percentage of NK cells (CD3-CD56+cells) in CD3-cells were 2.33％ and 85.32％,respectively (P＜0.01),which covered the whole lymphocytes 1.06％ and 69.42％,respectively (P＜0.01),which showed that NK was the main cell type in the amplificated lymphocytes.(2) The killing rate of NK cells on ovarian cancer cells in vitro:the results detected by LDH release experiments showed that NK cells could performed strong nonspecific killing effect on ovarian cancer cell lines SKOV3,HOC1A,3AO and CAOV3,as well the normal ovarian cell line T29 and NK sensitive cell line K562,and the killing effect increased significantly along with the increase of effector cells and target cells ratio (P＜0.01).When the ratio was 1 ∶ 1,the killing rate was 37％ for K562,while the rate of killing of other cells was around 10％ (P＜0.05).When the effect-target ratio was 20∶1 and 50∶ 1,in addition to CAOV3 cells (more than 70％),NK cells had a kill rate of more than 80％ for other ovarian cancer cells lines and their control cell K562 and T29 cells (P＞0.05).Conclusion NK cells could be established in vitro and have a good non-specific killing effect on ovarian cancer cells.

Objective;To explore the regulative effect of perceived social support between personality and mental health.Methods;With Perceived Social Support Scale,NEO Five Factor Inventory and General Health Questionnaire-GHQ 20,1800 college students from 9 Hunan colleges and universities were inverstigated.Results;①Significant positive correlation existed between the factors of GHQ-20 and NEO-N,while significant negative correlation between the factors of GHQ-20 and NEO-E,NEO-C and all factors of perceived social support;perceived social support and its factors had significant negative correlation with NEO-N,while significant positive correlation with NEO-E and NEO-C.②There was significant interaction effects between perceived social support and personality existing in mental health.Conclusion;Students' perceived social support play a regulative role between personality and mental health.

0.05).Conclusions:Combined anchorage can provide maximum anchorage compared with traditional face bow and was accepted easily by patients.