0.05). Conclusion: Spironolactone could not enhance or inhibit the growth of hair follicle.

Objective:To study the effects of duty cycle and frequency of microarc oxidation(MAO) on the titanium ceramic bonding strength.Methods:Titanium samples were treated with MAO in a Na2SiO3 electrolytic solution with voltage 300 V?3 min. According to the different duty cycle and frequency,experimental groups were named as:group Ⅰ(0.2, 500 Hz); group Ⅱ(0.2, 1 000 Hz); group Ⅲ(0.04,1 000 Hz); group Ⅳ(0.04,500 Hz) and group Ⅴ(0.12,750 Hz). The non-MAO samples were used as a control group.The surface of the samples was observed by scanning electron microscope (SEM).The samples were bonded to porcelain,and the bonding strength was measured by a three point bending test according to ISO 9693.Results:The surfaces of 1 000 Hz test pieces were smaller holes,more holes in the number and thicker layer than that of 500 Hz. When measured the bonding strength(MPa) of the samples, group Ⅳ was higher than group Ⅲ(P

Objective To evaluate the safety,local efficacy and survival rates of isolated pulmonary metastases from colorectal carcinoma treated with CT-guided radiofrequency ablation.Methods A total of 28 patients with isolated pulmonary metastases from colorectal carcinoma were performed with CT-guided radiofrequency ablation (radiofrequency ablation group).The size of the lesion was 1.2-5.0 (2.9 ± 1.0) cm.During the same time,9 patients,who did not take any treatment for isolated pulmonary metastases from colorectal carcinoma,were collected as control group.The size of the lesion was 2.0-5.0 (3.6 ± 1.0) cm.The local progression-free rates and overall survival rates were compared.Results All the cases were able to complete the radiofrequency ablation in radiofrequency ablation group.During and after the procedure,no major complications occurred.The 1-,2-,and 3-year local progression-free rates and overall survival rates in radiofrequency ablation group were significantly higher than those in control group.The local progression-free rates were 89.3％ vs.76.2％,78.6％ vs.33.9％,70.7％ vs.16.9％.The overall survival rates were 96.4％ vs.77.8％,85.7％ vs.44.4％,56.7％ vs.22.2％.The differences between two groups had statistical significance (P ＜ 0.01).Conclusion CT-guided radiofrequency ablation for isolated pulmonary metastasis from colorectal carcinoma is a safe,effective,minimally invasive treatment,and can significantly improve the local progression-free rates and overall survival rates.

Objective To evaluate the effect and mechanism of IL‐6 induced Gefitinib resistance in non small cell lung cancer (NSCLC) .Methods The sensitivity of cells to Gefitinib ,the invasion ability of cells and the expression of phosphorylated p‐mTOR was assessed by MTT assay ,Transwell assay and Western blot ,respectively .PC‐9psb388 stable over expressing human recombi‐nant IL‐6(hrIL‐6) cell line was established by transfecting PC‐9 cells with a lentivirus psb388 expressing IL‐6 and stable transfecta‐nts over‐expressing IL‐6 in human lung cancer cell line PC‐9 .The sensitivity of cells to Gefitinib ,the invasion ability ,expression of p‐mTOR were then detected .PC‐9/PC‐9psb388 xenografts were established and the expression of p‐mTOR and IL‐6 in tumor sec‐tions were then detected .Results The sensitivity of PC‐9 cells to Gefitinib was reduced by IL‐6 ,the invasion ability of PC‐9 cells and the expression of p‐mTOR was significantly increased with IL‐6 treatment .The sensitivity of PC‐9 cells to Gefitinib was promi‐nent higher in PC‐9psb388 cells ,while the invasion ability of PC‐9psb388 cells and the expression of p‐mTOR was higher than PC‐9 cells .The sensitivity to Gefitinib was improved and expression of p‐mTOR reduced in rapamycin‐treated PC‐9psb388 cells and IL‐6 stimulated PC‐9 cells .Tumor volume of PC‐9psb388 xenografts was significantly higher than that of PC‐9 cells .The expression of p‐mTOR and IL‐6 in tumor sections of PC‐9psb388 group were higher than that of PC‐9 group .Conclusion IL‐6 could elevate the expression of p‐mTOR to induce Gefitinib resistance in non small cell lung cancer (NSCLC) .

Purpose To explore the value of low tube voltage, original data iterative reconstruction (SAFIRE) and intelligent optimum tube voltage scanning (CARE kV) technology in reducing radiation dose of high resolution CT (HRCT) temporal bone scanning and its impact on image quality. Materials and Methods Ninety patients with ear problem underwent clinical HRCT scan. All the patients were randomly divided into group A (conventional scanning), group B (CARE kV) and group C (low tube voltage) according to chronological order, with 30 cases in each group. Image quality was double-blind scored by two qualified radiologists. CT value, noise, contrast to noise ratio (CNR), signal to noise ratio (SNR), CT dose index volume (CTDIvol), dose-length product (DLP) and effective dose (ED) were compared among three groups. Results Image quality and the average CT value had no statistical difference among three groups (F=3.70, 3.61;P>0.05);noise, CNR, SNR, CTDIvol, DLP and ED had statistical difference among three groups (F=1.23, 1.42, 2.05, 2.13, 1.79, 1.32; P<0.05). Compared with group B, noise reduced about 14.1%in group C, while CNR and SNR increased about 32.1%and 26.3%, respectively (q=3.64, 3.45, 4.36; P<0.05). CTDIvol, DLP and ED were significantly different between group B and group C (q=3.13, 4.24, 4.24; P<0.05). Conclusion Scanning with low tube voltage, SAFIRE and CARE kV technology not only effectively reduce radiation dose, but also obtain satisfactory image quality. It should be widely utilized.

Objective; To evaluate the influence of electrolyte's concentration at micro-arc oxide treatment on the bonding strength of titanium to porcelain. Methods; CP titanium specimens with size of 25 mm ×3 mm ×0. 5 mm were treated with micro-arc oxidation (MAO) in Na_2SiO_3 solution of three different concentrations. After ultra-low-fusing porcelain was applied, a three-point-flexure-test was used to evaluate the bonding strength of titanium to porcelain. The surface of the specimens was observed by SEM and EDS, as well as the interface between titanium and porcelain. Results; The bonding strength values between titanium treated with MAO and porcelain was significantly higher then the control groups, Croup 20 g/L has the highest bonding strength values. SEM/EDS suggested that a porous thin layer of oxide which contains Si element is created by MAO, and higher concentration of Na_2SiO_3 leads to more Si element in oxide. Conclusion; MAO treating can improve the bonding strength between titanium and ceramic. Electrolyte's concentration has an effect on the bond strength between titanium and porcelain.

Objective To evaluate the role of heme oxygenase-1 ( HO- 1 ) in inflanmatory responses in septic rats.Methods Seventy-two male Wistar rats,aged 10-14 weeks,weighing 250-300 g,were used in this study.The animals were anesthetized with intraperitoneal 2％ pentobarbital sodium 50 mg/kg.Sepsis was induced by cecal ligation and puncture (CLP).The animals were randomly divided into 4 groups ( n =18 each):control group (C group),CLP group,HO-1 inducer cobalt protoporphyrin Ⅸ (CoPPⅨ) group (Co group) and HO-1 inhibitor zinc protoporphyrin Ⅸ (ZnPPⅨ) group (Zn group).Six rats in each group were randomly chosen at 6,12 and 24 h after operation to collect blood samples,and then the animals were sacrificed to obtain lung tissues at 24 h after operation.The serum levels of TNF-α,IL-6 and high mobility group box 1 (HMGB1) were determined by ELISA.The expression of HMGB1 mRNA in lung tissues was detected by RT-PCR.Another 40 Wistar rats with the same conditions were grouped according to the method mentioned above and the survival curve was drawn.Results Compared with group C,the serum levels of TNF-α,IL-6 and HMGB1 were significantly increased,the expression of HMGB1 mRNA in lung tissues was up-regulated,and the survival rate was significantly decreased in CLP,Co and Zn groups ( P ＜0.05).Compared with group CLP,the serum levels of TNF-α,IL-6 and HMGB1 were significantly decreased,the expression of HMGB1 mRNA in lung tissues was down-regulated,and the survival rate was significantly increased in group Co ( P ＜ 0.05),while no significant change was found in the parameters mentioned above in group Zn ( P ＞ 0.05).Conclusion Inducing the expression of HO-1 is helpful in reducing inflammatory responses in septic rats.

Objective　To evaluate the changes and clinical s ignificances of serum growth hormore (GH) and GH binding protein (GHBP) in patie nts with obstructive jaundice (OJ). Methods　Serum levels of GH, GHBP, insulin-like growth factor-Ⅰ (IGF-Ⅰ), endotoxin, prealbumin concentr ation and liver function in 60 male in patients with OJ were detected 1 d preope ratively and 1, 3, 7 d postoperatively. And 40 male patients with simple gallbla dder stone hospitalized in the same period were served as control. Resu lts　The levels of GH, GHBP and IGF-Ⅰ were significantly lower in pati ents with obstructive jaundice than in control group(P<0.01), which was corr elated with the levels of bilirubin, endotoxin and prealbumin (P<0.01). Conclusion　The obviously downregulation of GH/GHBP axis in patients with OJ probably results from the inbibition of expression of GH receptor due t o nutritional dysfunction and endotoxemia, and further aggravate the nutritional dysfuction and endoxemia, which may be one of the important factors in the path ophysiological changes of OJ.

Objective To discuss the significance of the application of real-time quantitative PCR(RQ PCR)for diagnosis and guidance therapy of cytomegalovirus(CMV)infection after allo- hematopoietic stem cell transplantation(allo-HSCT).Methods Thirty-three patients were undergo- ing allo-HSCT.After hematopoietic reconstitution,patients'peripheral blood samples were detected for CMV DNA by RQ-PCR periodically.Anti-viral therapy was begun,attenuated and stopped ac- cording to the results of CMV DNA detection.The effects of anti-viral therapy and patients' clinical results were observed.Results CMV DNA was detected in blood samples from 13 of 33 patients. There were 21 episodes in these patients.Only 1 episode wasn't controlled hecause the patient gave up the therapy.CMV DNA copies were disappeared soon or decreased and then disappeared during anti-viral therapy in the others'.Patients which had symptoms and/or dysfunction of organs were cured too.Each course of anti-viral therapy was shorter than ordinary course.Conclusions CMV in- fection can he diagnosed as early as possible by RQ PCR.To begin,attenuate and stop anti-viral ther- apy according to the results of RQ-PCR is safe.The course is shortened and the side effects of anti vi- ral drugs were attenuated.

PurposeTo evaluate the impact of filtered back-projection (FBP) and sinogram-affirmed iterative reconstruction (SAFIRE) technique on the image quality of routine dose temporal bone high resolution CT (HRCT) scan, and to provide reference for the realization of low dose scanning.Materials and Methods Sixty patients underwent routine dose temporal bone HRCT scan, 6 groups of images were reconstructed with FBP and SAFIRE (strength grade 1-5), average CT value, noise (SD), signal to noise ratio (SNR), contrast to noise ratio (CNR), subjective score and lesion detection were compared between different groups.Results There was no significant difference of average CT value among the 6 groups (P>0.05); compared with FBP, SD of SAFIRE (strength 1-5) reconstruction decreased gradually (F=1.78,P<0.01), which was 23.1%, 39.2%, 42.4%, 54.1% and 61.2% respectively; SNR and CNR increased gradually (F=1.42 and 3.15, P<0.05), SNR increased 26.6%, 40%, 71.1%, 117.7% and 153.3% respectively, while CNR increased 17.4%, 33.1%, 63.2%, 104.1% and 147.2% respectively. The differences among the 6 groups were statistically significant (P<0.05), subjective scores of SAFIRE 2-4 were higher than those of FBP, SAFIRE 1 and SAFIRE 5 group, while the difference among SAFIRE 2-4 group was statistically insignificant, reconstruction smoothness and edge sharpness of SAFIRE 3 group was better, with highest objective score.Conclusion Routine dose temporal bone HRCT scan combined with SAFIRE reconstruction can increase the image quality of temporal bone high resolution scan effectively, with the potential for radiation dose reduction.