To observe the effect of IL-2 gene modification on the character of biology and function in dendritic cells( DC) and to investigate the immune mechanism of specific anti-tumor of IL-2 gene modification in DC. Methods: DCs were prepared from mouse bone marrow and genetically modified by IL-2 adenovirus. Then observe the changes of DC morphology by scanning electro-microscopy, analyzed molecules on DC by FACS, examined the expression of IFN-? mRNA in DC by RT-PCR.The stimulatory capacity of DC to T cells detected by MLR their capacity of antigen present were measured by 3H-TdR mix into assay. Results: After IL-2 gene modification, the morphology of DC was changed, its pseudopod was more and longer. The expression of Ia, B7-1, B7-2 and CD40 molecules was more on DC surface. The IFN-7 mRNA was expressed in the DC-EL-2 and DC-rhIL-2.DC-IL-2 could stimulate allogeneic T cells more potently and IL-2 gene-modified DC could induce more potent antigen-specific autogeneic CTL. Cooclusioo: IL-2 genetic modification can promote DC growth and up regulate their expression of membrane immune molecules that are relevant for antigen presentation of DC,and enhanced the biologic activity of the DC.

OBJECTIVE To monitor the sterilization effect of hydrogen peroxide gas plasma sterilizer with process challenge derice(PCD).METHODS Hydrogen peroxide gas plasma sterilizer was used to sterilize different material and structure items in simulation field sterilization trial.The test pieces have been cultured for 7 days at 37 ℃.Make the test records in detail.RESULTS The hemostatic forceps,surface of lines and biological indicators,as well as 300 mm stainless steels tube and 2000 mm Teflon tube were sterilized successful.But 600 mm and 300 mm stainless steels of low temperature did not past the challenge tests.The results of test surface and test lumen were inconsistent.CONCLUSIONS PCD is need to be introduced in monitoring sterilization effect of hydrogen peroxide gas plasma sterilizer.

Cancer is a leading cause of death worldwide. Although a variety of cancer therapies, such as surgical resection and local ablation, chemoembolization, radiotherapy, and systemic chemotherapy, have developed rapidly in recent years, the curative effect and 5 year-survival rate of cancer remain to be unsatisfactory. In recent years, with the deepening basic research of hydrogen, its role on the treatment of various diseases including cancer has attracted an increased attention. Hydrogen can promote the apoptosis of colon cancer cells, and which combined with 5-fluorouracil has a synergistic effect and can reduce the renal toxicity induced by cisplatin, without affecting its anti-tumor effect. Hydrogen can alleviate the side effects of radiotherapy, significantly improve the quality of life for patients with liver cancer, and does not affect the effect of radiotherapy. Hydrogen application provides a new therapeutic approach to the treatment of cancer. The specific mechanism of hydrogen in cancer treatment needs further study. This article reviewes the research progress of the role of hydrogen on the treatment of cancer, including antioxidant, anti-inflammatory, adjuvant chemoradiotherapy, and the regulation of signaling pathways.

BACKGROUND:Implant stability is the basic requirement of osseointegration and also one of important parameters to judge whether the implant is implanted successfully. Generaly, the implant stability is closed related to bone quality (bone hardness and bone density) in the implant zone, implant shape, diameter and length. OBJECTIVE:To continuously monitor the changing trend of implant stability during early healing period due to the utilization of osteotome technique by resonance frequency analysis. METHODS:Twenty patients with class Ⅳ defects in the posterior maxila who underwent implant restoration (4.8 mm×12 mm) from 2010 to 2011 at the Department of Stomatology, the 521 Hospital of China North Industries Group Corporation were recruited. Resonance frequency analysis was used to measure the implant stability at implant insertion, 1, 2, 3, 4, 6, 8 and 12 weeks postoperatively. RESULTS AND CONCLUSION:Al the implants achieved osseintegration uneventfuly within 12 weeks. At implant instalation, the mean implant stability quotient value was 69.66±4.75. An increase trend in implant stability quotient values was visible within 1 week, and the implant stability quotient value reached the peaked at 1 week, and then decreased to the lowest point at 2 weeks, which were significantly different from that at implant instalation (P < 0.05). In the secondary stability phase, the increasing slope of implant stability quotient values reached a plateau by the 8th week. The resonance frequency analysis can estimate the quantitative change of implant stability after applying the osteotome technique, and the osteotome technique can promote the implant initial stability.

Objective To explore basic regularities in sinew lesion distribution in patients with knee osteoarthritis. Method Two hundred and thirty knee osteoarthritis patients with 253 affected knees were selected. Under the sinew theory, the positions and frequency of sinew foci around the knee joint were counted by palpation. Result In the distribution of foci, the total frequency accounted for 39.1% in the Foot-Yangming. Of them, the single Foot-Yangming sinew type accounted for 23.3% and the complex type accounted for 48.5%. The total frequency accounted for 32.4% in the Foot-Taiyang. Of them, the single Foot-Taiyang sinew type accounted for 21.3%, the complex type accounted for 44.5%. The Foot-Yangming + Foot-Taiyang sinew lesions accounted for 14.6% and the single foot-three-yin sinew type accounted for 15.0%. Conclusion Knee osteoarthritis of Foot-Yangming or Foot-Taiyang sinew type should be treated from “sinew”.

Objective To investigate the neural circuit of inhibitory control in late-onset depressed patients(LOD) by functional magnetic resonance imaging(fMRI). Methods Fourteen late-onset depressed patients (LOD group) and thirteen elderly healthy subjects( control group) were recruited. The two groups were age, gender, and education matched. All the subjects performed a visual Go/Nogo task during the fMRI scan. Erect or inverted isosceles triangular figures were used for stimuli. The two groups were instructed to press a button as quickly and correctly as possible when the erect triangular figures(Go) were presented, but not to response when the inverted triangular figures(Nogo) were presented. The differences of brain activation between the two groups were compared. Results ( 1 ) During Go trials, there were no significant differences in reaction time and hit rate between the two groups (P ＞ 0.05 ). During Nogo trials, however, the late-onset depressed patients showed much higher false alarm rate(0.09 ±0.06) compared with control group(0.04 ±0.02) (P＜0.05＝. (2) During Go trials , LOD group showed significantly greater activity in left postcentral gyrus, left inferior parietal lobule, right precentral gyrus, left paracentral lobule, right inferior parietal lobule, right anterior cingulate cortex, left middle frontal gyrus, right middle frontal gyrus, right superior frontal gyrus compared with the control group. Whereas during Nogo trials, LOD group exhibited greater activity in left inferior parietal lobule and left middle frontal gyrus compared with the control group. Conclusion This study suggests that inhibitory control dysfunction in late-onset depressed patients may be closely related to frontostriatal circuit impairment. Over activation in left middle frontal gyrus, right middle frontal gyrus and right anterior cingulate cortex may contribute to the pathogenesis of late-onset depression.

Objective To explore the status of job burnout of medical staffs in minority border areas. Methods A total of 906 medical personnel from Pu'er hospitals in Yunnan Province were as-sessed with Maslach Burnout Inventory General Survey (MBI-GS) by t test, descriptive statistics, chi-square test, ANOVA and LSD-t pairwise comparison. Results ①The emotional exhaustion, cynicism and reduced personal accomplishment of medical staffs in minority border areas (1.55±1.40, 0.99± 1.29, 2.47±1.98) are significantly lower than general areas (P=0.000, 0.010, 0.000); ②emotional ex-haustion, cynicism and Maslach Burnout Inventory (MBI) total points of different levels of hospital medi-cal staff, the score of which in descending order are:municipal, county and township (town) levels (P=0.000, 0.000, 0.000); ③Female medical personnel's emotional exhaustion and cynicism are scored significantly higher than males medical staff (P=0.000, 0.025); ④The scores of emotional exhaustion, cynicism, reduced personal accomplishment and MBI total points of Bachelor medical staff are signifi-cantly higher than those of colleges as well as secondary schools and below (P=0.000, 0.000, 0.000, 0.012); ⑤The scores of reduced personal achievement of Lahu medical staff are higher than those of other ethnic groups (P=0.009). Conclusion In medical staffs in minority border areas there exists a certain extent of job burnout, which presents differences among genders, educational background, hos-pitals and ethnic groups.

Objective:To explore the application of OTSU-based self-attenuation correction PET (sacPET) reconstruction technology in 18F-florbetapir (AV45) imaging. Methods:From November 2018 to December 2019, 7 confirmed Alzheimer′s disease (AD) patients (4 males, 3 females, age (69.6±4.5)years) and 3 healthy controls (HC; 1 male, 2 females, age (68.0±4.6) years) were recruited prospectively for 18F-AV45 PET imaging in the First Affiliated Hospital of Sun Yat-Sen University. Original data collected by PET acquisition was processed with sacPET reconstruction and then compared with standard PET images by visual analysis and semi-quantitative analysis. Fisher exact test, Kappa test and Pearson correlation analysis were used to analyze data. Results:In HC group and AD group, the radioactive distribution showed by sacPET images and that by standard PET images were similar, and the contrast of gray-white matter in sacPET images was weaker than that in standard PET images. Moreover, the positive uptake area of the cortex in the AD group was smaller than that in standard PET images. Visual analysis showed 19 positive regions in sacPET images and 22 in standard PET images, with no statistical difference of positive rates of the sub-regions in the cortex between the two PET images (all P>0.05), and the overall consistency of 88.00% (44/50; Kappa=0.75 (95% CI: 0.57-0.94), P<0.05). Semi-quantitative analysis showed that the standardized uptake value ratio (SUVR) of frontal lobe and cingulate gyrus measured by sacPET was lower than that measured by standard PET (0.93±0.06 vs 0.96±0.06 and 0.99±0.04 vs 1.01±0.04; t values: 5.30 and 5.10, both P<0.01), while SUVR of parietal lobe, temporal lobe and occipital lobe measured by sacPET was higher than that measured by standard PET (0.78±0.08 vs 0.68±0.07, 0.97±0.07 vs 0.91±0.08 and 0.94±0.11 vs 0.71±0.12; t values: 6.27, 7.36 and 16.90, all P<0.01). The overall SUVR of sacPET images was significantly correlated with the standard PET images ( r=0.75, P<0.001). Conclusion:For 18F-AV45 imaging, sacPET reconstruction technology can obtain reliable and effective PET images without CT data, but its accuracy and precision still need to be improved.

saline group(all P