Objective To investigate the practicality and stability of self -made bedside angle instrument in clinic .Methods 81 cases of mechanical ventilation were randomly divided into the experimental group (n=42) and the control group(n=39) .The bed head in the control group was elevated according to the experience and sensation .However the bed head in the experimental group was elevated by the self-made bedside angle instrument .The bed head elevation angle in the two groups was measured at the differ-ent timepoints .Results The accuracy of bed head elevation was 100% in the experimental group and 57 .69% in the control group , the difference between the two groups had statistical significance (P<0 .05) .Conclusion The bedside angle instrument has good practicality and stability ,effectively ensures the accuracy of the bed head elevation and contributes to conduct the body posture nursing on the patients with mechanical ventilation .

Bcl-2 family plays an important role in cell apoptosis pathway. The ratio of pro-apoptosis members and anti-apoptosis members closely correlates with tumorigenesis, tumor radiosensitivity and progno-sis. Recent years ,according to the correlation of Bcl-2 family and tumor radiosensitivity, many researchers want to find new therapeutic strategies that target Bcl-2 in clinical radiotherapy.

Objective To analyze the clinical effect of both micro-implant anchorage and selective extracting maxillary first molar to correct the failure of orthodontics.Methods From January 2006 to June 2012,24 cases who suffered from failure of orthodontics were treated in this department.To all patients,bilateral maxillary first molars were extracted,and micro-implant anchorage were planted into maxilla from buccal alveolar ridge to correct malocclusion acting as anchorages.Lateral cephalometric radiographs,intraoral photograph and facial photograph of every patient were taken before and after treatments; Their over bite and overjet molar relationship and incisors retraction were compared before and after treatments.Methods All the micro implant anchorages were sucessfuly implanted except two patients who experienced second operation owing to luxation of three implants.All the molars were strengthed and the profile improved along with their normal over bite and overjet.Conclusions The treatment of using micro-implant anchorage and selective extracting maxillary first molar is an ideal option of second orthodontics.Unconventional tooth extraction is used in this treatment.Micro implant anchorages are stable,acceptable and effective in clinical application.

Objective To investigate the effects of different doses of propofol on cognitive function after chronic cerebral ischemia-induced injury in aged rats. Methods Eighty male SD rats, aged 18 months, weighing 400-500 g, were randomly divided into 4 groups ( n = 20 each): shame operation group (group S), chronic cerebral ischemia group (group I), two propofol groups (groups P1 and P2 ). The chronic cerebral ischemia was induced by permanent occlusion of bilateral common carotid arteries. On 1 day after operation, intraperitoneal normal saline 2.5 ml was injected twice a day for7 consecutive days in groups S and I, and intraperitoneal propofol 10 and 50 mg/kg in 2.5 ml of normal saline were injected twice a day for 7 consecutive days in groups P1 and P2 respectively. On 3rd and 33rd days after the last injection (T1.2), 10 rats in each group underwent Morris water maze test to assess the cognitive function. After the test was completed, the rats were sacrificed and the hippocampi were removed and sliced (450-500 μm thick). Schaffer lateral branch in CA1 region was stimulated to induce long-term potentiation (LTP). Results Compared with group S, the escape latency was significantly prolonged, the number of animals' swimming across the platform, the ratio of the swimming time spent in the forth quadrant to the total swimming time, and the success rate of LTP induction were significantly decreased at T1 and T2 in groups I, P1 and P2 (P ＜ 0.05). Compared with group I, the escape latency was significantly prolonged, the number of animals' swimming across the platform, the ratio of the swimming time spent in the forth quadrant to the total swimming time, and the success rate of LTP induction were significantly decreased at T1 in groups P1 and P2, and at T2 in group P2 ( P ＜ 0.05). Conclusion Propofol aggravates the damage to cognitive function while it attenuates the chronic cerebral ischemia-induced injury in aged rats, especially the high dose.

[Objective]To evaluate the operability and clinical efficacy of injectable calcium sulfate for grafting bone defects.[Method]From June 2004 to August 2005,22 cases with benign bone lesions were treated with curettage and grafting with injectable calcium sulfate bone graft substitute(minimally invasive injectable graft X3,MIIG X3).There were 13 male cases and 9 femal cases.Their average age was 34.6(ranged,4~55).All the 22 cases were followed-up from 23 months to 37 months,average 31.6 months.All cases took radiographic examination regularly after the operation to assess the absorption rate of MIIGX3 and the formation rate of new bone.[Result]This injectable calcium sulfate with vacuum mixing was easy to use,providing complete fill and bony strength instantly when grafting bone defects.According to the raeiographs,MIIGX3 was absorbed almost at the same rate as new bone ingrowth in 8 to 24 weeks.[Conclusion]MIIGX3 is convenient to graft bone defects with fewer complications,capable of absorbing almost at the same rate as replacement of new bone.It's one of the best bone graft substitutes for grafting bone defects induced by benign bone lesions.

To observe the effect of intaspinal implantation of Schwann cells (SC) genetically modified with microgene pSVPoMcat on spinal cord injury (SCI) repair.120 SD rats were used to establish the hemisected spinal cord injury model at T 8 level,and they were divided randomly into three groups: genetically modified SC implantation group (group A),normal SC implantation group (group B) and control group without cell implantation (group C).One week after the operation ,combined behavioral score(CBS) and the cortical somatasensory evoked potential (GFAP) were measured and the expression of glial fibrillary acidic protein(GFAP) was examined by in situ hybridization and immunocytochemistry.Three months after the operation, all the rats were scanned with MRI and then were sacrificed.Neurofilament (NF) was examined with imunohistocytochemistry staining by using NF monoclonal antibody. Following were the results:(1) In group A,the number of cells expressed GFAP in injured sites was less than that in groups B and C.(2) MRI scanning showed that the SCI region almost recovered in group A but did not recover in group B.There was a malacie focus in SCI region in group C.This was corroborated by the NF staining.(3) The amplitudes of potential in the latent period in group A and B showed a tendency to recover,and it was consistent with CBS.The results suggested that the implantation of genetically modified SC with microgene pSVPoMcat could inhibit GFAP expression and promote the functional recovery of spinal cord injury in rats.

Liver perfusion technique has been used in drug study for many decades. Liver perfusion has outstanding advantages over other techniques, such as isolated hepatocytes, hepatic cell lines, and hepatocyte membrane vesicles.It is an ideal experimental model used in drug metabolism, drug-drug interactions, and pharmacokinetic studies. Liver perfusion technique, its advantages or disadvantages, and its extensive applications have been reviewed.

Objective To establish the animal model of photochemical damage and investigate the protective effects and mechanism of taurine on the retina photochemical damage in rats. Methods Fifty rats were randomly divided into normal control group, light damage group and 4% taurine supplementation group. After 15 day cyclic light and 24-hour dark adaptation, the last two groups were exposed to (3000?200) lx transmitted by six cold white lights. After 24-hour exposure, the rats were stayed in darkness. The retinal morphology was detected through light and electron microscope and the retinal function was detected by Scot-ERG. The concentration of MDA and the activity level of SOD/GSH-px were measured. Results In light damage group, the a and b amplitude (Aa/Ab) were significantly decreased, but in taurine group, except the decreased Aa, others were of no significant changes. The retina inner and outer segments were swollen and in disorder after exposure, the outer nuclear layer got thinner than that of control. The mitochondria in light damage group was swollen, but in taurine group changes were less significant. After exposure, the concentration of MDA in retina was markedly increased in light damage group and the activity level of SOD/GSH-px were decreased, but in taurine group MDA slightly increased and SOD/GSH-px was up-regulated but of no significance. Conclusion Dietary supplementation with 4% taurine partially protected photoreceptor from degeneration, which might correlate with the antioxidation and inhibition of free radical character of taurine.

Objective To investigate retina structure and function under the condition of acute continuous hypoxia at high altitude and study on the protective effects of taurine on retina injury. Methods Low-pressure chamber was used to simulate 4 500 m and 5 500 m altitude.A total of 126 SD rats were used in this study,half assigned to the conditions under plain,4 500 m and 5 500 m,the other half before the same assignment fed with 2.4% taurine in plain for a week.At 2,6,12,24,48,72 h after entering the chamber,the eyes of SD rats were taken out,fixed and sectioned.Retina layer structure and ultrastructure of retina M?ller cells were observed by light microscope and transmission electron microscope.The activity of succinate dehydrogenase(SDH) and lactate dehydrogenase(LDH) were detected with enzymohistochemistry.Results INL,IPL and GCL were injured in low oxygen.In the early period,migrating IPL cells increased(P