Analysis of current γ knife stability testing status in medical institutions / 中国职业医学

@#Abstract: Objective To follow up and evaluate the stability testing status of γ stereotactic radiotherapy system (hereinafter γ knife WS 582-2017 Specifications for Testing of Quality Control in X and γ referred to ) in medical institutions based on the RayStereotactic Radiotherapy System WS 582-2017 Methods (hereinafter referred to ). A total of 43 medical institutions using γ knife and 54 medical physics personnel were recruited as the research subjects by random sampling method. Based on the - - standard tracking evaluation method, we followed up the evaluation of γ knife stability testing based on WS 582 2017. Results - Only 66.7% of the 54 subjects preformed WS 582 2017 in their daily work. Only 30.2% (all were tertiary hospital) of 43 medical institutions were equipped with complete quality control and testing equipment. The implementation rate of γ knife stability test was 67.4%, and it was not carried out in strict accordance with the test events and test cycle requirements - specified in the WS 582 2017. There were incomplete test events, incomplete records or test cycles that did not meet the Conclusion standard requirements in γ knife stability test. Medical institutions did not carry out γ knife stability tests in strict - accordance with the projects and cycle required by the WS 582 2017. The reasons are related to medical institutions are not equipped with complete testing equipment, the personnel are lack of understanding of relevant national standards, the poor publicity and implementation of the standards, the lack of standardized training channels and inadequate health supervision.

CircRNA-32011 regulates apoptosis induced by arsenic trioxide in cardiac myocytes / 中国药理学通报

Aim To investigate the effect of circRNA- 32011 on myocardial apoptosis induced by arsenic triox- ide (ATO).Methods Primary cardioniyocytes of suckling neonate mouse were treated with ATO ( final concentration 10 (xniol • L_1 ) for 24 h.Then cell via¬bility was measured by M IT assay.The mKNA expres¬sion levels of Bel-2/ Bax and circRNA-3201 I were de¬tected by KT-PCK.Bcl-2/Bax protein expression lev¬els were detected by Western blot.Overexpression and knock down circHNA-32011 respectively by plasmid and siHNA were used to verify its function in ATO-in- duced cardiomyocyte apoptosis.Results Myocardial cell viability decreased, Bel-2 expression significantly decreased while Bax expression increased in ATO group compared with the control group.CircKNA- 32011 was down-regulated in ATO ineuhated cardio¬niyocytes.Ovcrex press ion of circRNA-32011 in ATO- incubated cardioniyocytes increased myocardial cell vi¬ability and Bel-2 expression and decreased the expres¬sion of Bax.Knockdown of circRNA-32011 could fur¬ther reduce cardiomyoevte activity and Bel-2 expression and increase the experssion of Bax induced by ATO.Conclusions CircRNA-32011 protects cardiac myo¬cytes from apoptosis induced by arsenic trioxide, which may provide a new potential therapeutic strategy for ATO-induced myocardial injury.

The Influence of Drill Bit Structure and Drilling Parameters on Bone Drilling Process / 医用生物力学

Objective To make drilling mechanical and thermal analysis of bones with different drill bits and drilling parameters, so as to reduce the drilling force and drilling temperature in drilling process and decrease the damage to surrounding bone tissues. Methods The bone drilling model was established by finite element simulation software AdvantEdge. By comparison with the pig femur drilling experiment, the simulated and experimental results of standard twist driII and three standard multi-facet drills at different speeds and feed rates were analyzed. Results The simulation and experiment comparison showed that the influences of driII bit structure, drilling speed, feed rate on drilling force and drilling temperature were consistent, and the established simulation model was credible. Conclusions Under the same drilling conditions, the multi-facet driII for drilling rubber had lower drilling force and drilling temperature than the standard twist drill. The research findings provide theoretical basis for the application of multi-facet driII in fracture surgery.

Serum levels and clinical significances of miR-205 and miR-221 in patients with colon cancer / 国际肿瘤学杂志

Objective@#To investigate the serum levels and clinical significances of microRNA-205 (miR-205) and microRNA-221 (miR-221) in patients with colon cancer.@*Methods@#A total of 172 patients with colon cancer (colon cancer group), 130 patients with benign diseases of colon (benign lesion group) and 70 healthy persons (control group) admitted to Central Hospital of Western Hainan from January 2016 to December 2018 were selected. The serum levels of miR-205 and miR-221 in each group were detected, and their relationships with clinicopathological characteristics of patients with colon cancer were analyzed. The diagnostic values of the serum levels of miR-205 and miR-221 in colon cancer were analyzed by receiver operating characteristic (ROC) curve. Pearson correlation analysis was used to analyze the correlation between the serum levels of miR-205 and miR-221.@*Results@#The serum levels of miR-205 in colon cancer group, benign lesion group and control group were 2.84±0.96, 1.16±0.27 and 1.05±0.23, with a statistically significant diffe-rence (F=10.113, P<0.001). The serum levels of miR-221 in the three groups were 1.95±0.74, 0.37±0.08 and 0.32±0.05, with a statistically significant difference (F=12.416, P<0.001). Further pairwise comparisons found that the serum levels of miR-205 and miR-221 in colon cancer group were significantly higher than those in benign lesion group and control group (all P<0.001). The serum levels of miR-205 and miR-221 in patients with colon cancer were related with TNM stage (t=5.412, P<0.001; t=6.103, P<0.001), degree of tumor differentiation (t=4.573, P=0.028; t=4.805, P=0.013) and with or without lymph node metastasis (t=5.837, P<0.001; t=7.410, P<0.001). ROC curve analysis showed that the optimal cut-off values of the serum levels of miR-205 and miR-221 for the diagnosis of colon cancer were 2.17 and 1.30, respectively. The area under the curve of the two combined diagnostic method for colon cancer was the largest (0.924, 95%CI: 0.865-0.983), with the sensitivity and specificity of 91.3% and 87.4%. The correlation analysis showed that the serum levels of miR-205 and miR-221 were positively correlated in patients with colon cancer (r=0.837, P<0.001).@*Conclusion@#The serum levels of miR-205 and miR-221 are significantly increased in patients with colon cancer, and the two combined detection has a high value for the diagnosis of colon cancer.

Serum levels and clinical significances of miR-205 and miR-221 in patients with colon cancer / 国际肿瘤学杂志

Objective To investigate the serum levels and clinical significances of microRNA-205 (miR-205) and microRNA-221 (miR-221) in patients with colon cancer.Methods A total of 172 patients with colon cancer (colon cancer group),130 patients with benign diseases of colon (benign lesion group) and 70 healthy persons (control group) admitted to Central Hospital of Western Hainan from January 2016 to December 2018 were selected.The serum levels of miR-205 and miR-221 in each group were detected,and their relationships with clinicopathological characteristics of patients with colon cancer were analyzed.The diagnostic values of the serum levels of miR-205 and miR-221 in colon cancer were analyzed by receiver operating characteristic (ROC) curve.Pearson correlation analysis was used to analyze the correlation between the serum levels of miR-205 and miR-221.Results The serum levels of miR-205 in colon cancer group,benign lesion group and control group were 2.84 ± 0.96,1.16 ± 0.27 and 1.05 ± 0.23,with a statistically significant difference (F =10.113,P ＜ 0.001).The serum levels of miR-221 in the three groups were 1.95 ± 0.74,0.37 ± 0.08 and 0.32 ± 0.05,with a statistically significant difference (F =12.416,P ＜ 0.001).Further pairwise comparisons found that the serum levels of miR-205 and miR-221 in colon cancer group were significantly higher than those in benign lesion group and control group (all P ＜ 0.001).The serum levels of miR-205 and miR-221 in patients with colon cancer were related with TNM stage (t =5.412,P ＜0.001;t =6.103,P ＜0.001),degree of tumor differentiation (t =4.573,P =0.028;t =4.805,P =0.013) and with or without lymph node metastasis (t =5.837,P ＜ 0.001;t =7.410,P ＜ 0.001).ROC curve analysis showed that the optimal cut-off values of the serum levels of miR-205 and miR-221 for the diagnosis of colon cancer were 2.17 and 1.30,respectively.The area under the curve of the two combined diagnostic method for colon cancer was the largest (0.924,95％ CI:0.865-0.983),with the sensitivity and specificity of 91.3％ and 87.4％.The correlation analysis showed that the serum levels of miR-205 and miR-221 were positively correlated in patients with colon cancer (r =0.837,P ＜0.001).Conclusion The serum levels of miR-205 and miR-221 are significantly increased in patients with colon cancer,and the two combined detection has a high value for the diagnosis of colon cancer.

Antifungal Properties and Chemical Analysis of Essential Oil from Vitex negundo Seeds.

Aims: To investigate the constituents and antimicrobial activity of essential oil from Vitex negundo seeds. Study Design: The essential oil of Vitex negundo seeds was prepared by hydrodistillation. GC/MS technique was used to determine the volatile constituents in the oil. A total of 13 isolates of bacteria and fungi were employed to evaluate the antimicrobial activity of the oil. Place and Duration of Study: Department of Pharmacognosy, School of Pharmacy, Second Military Medical University, between April 2010 and September 2010. Methodology: Essential oil from Vitex negundo seeds were obtained by hydrodistillation, with constituents analyzed by GC-MS. Antimicrobial activity of the oil was evaluated against both Gram-positive and Gram-negative bacteria and fungi. Results: A total of forty-two components, representing 91.36% of the oil, were identified. n-Hexadecanoic acid (17.68%), eudesm-4(14)-en-11-ol (12.39%) and caryophyllene oxide (10.79%) were found to be the major constituents. The essential oil exhibited significant antifungal activity against Candida albicans at MIC 4.0 μg/ml. Conclusion: The essential oil of Vitex negundo seeds showed potential antifungal activity and can be of potential use in pharmaceutical fields.

Application of Auto-regressive Linear Model in Understanding the Effect of Climate on Malaria Vectors Dynamics in the Three Gorges Reservoir / 生物医学与环境科学（英文）

It is important to understand the dynamics of malaria vectors in implementing malaria control strategies. Six villages were selected from different sections in the Three Gorges Reservoir for exploring the relationship between the climatic factors and its malaria vector density from 1997 to 2007 using the auto-regressive linear model regression method. The result indicated that both temperature and precipitation were better modeled as quadratic rather than linearly related to the density of Anopheles sinensis.

The changes of iNOS and NO in the osteogenic differentiation process of rat bone marrow stromal cells promoted by icariside II / 药学学报

This study is to investigate the effects on the expression of iNOS and production of NO in the osteogenic differentiation process of rat bone marrow stromal cells (rBMSCs) by icariside II. rBMSCs were cultured by adherence screening method. When the culture dishes were covered with 80% cells, the osteogenic induced cultures were adopted. Icariside II was supplemented into the culture at 1 x 10(-5) mol x L(-1). The activity of iNOS, content of NO and osteogenic differentiation markers including alkaline phosphatase (ALP) activity, CFU-FALP and mineralized bone nodules were compared among the icariside II-supplemented group, L-NMAE group, icariside II + L-NAME group and the control. Total RNA was isolated and the gene expression of iNOS, Osterix and Runx-2 was investigated by real-time PCR. Total protein was also isolated and the secretion of iNOS and collagen I was examined by Western blotting. Icariside II can significantly improved ALP activity, CFU-FALP amount and mineralized nodules. Besides, the mRNA level of factors related to the osteogenic differentiation includes Osterix and Runx-2 also enhanced. The secretion of collagen I also promoted significantly. But all of these effects can be inhibited by L-NAME which can specifically inhibit the activity of iNOS. Icariside II enhances the osteogenic differentiation of rBMSCs significantly, but if the activity of iNOS was blocked by L-NAME, the osteogenic differentiation markers decrease accompanied with iNOS and NO decrease, suggesting that icariside II stimulates the osteogenic differentiation via enhancing the activity of iNOS and promoting the generation of NO.

Preparation and antitumor effects of nanovaccines with MAGE-3 peptides in transplanted gastric cancer in mice / 癌症

<p><b>BACKGROUND AND OBJECTIVE</b>As a prospective vaccine carrier, nanoparticles can protect antigens from degradation and enhance immune response. This study prepared nanovaccines with MAGE-3-derived CD4+-CD8+T cell epitope peptides, and investigated its character and antitumor effects on transplanted gastric cancer in mice.</p><p><b>METHODS</b>We adopted the self-assembly method to prepare peptide/chitosan conjugated with deoxycholic acid (chitosan-deoxycholic acid) nanoparticles. We observed the appearance of the chitosan-deoxycholic acidnanoparticles through a transmission electron microscope (TEM) and analyzed the peptide content and its release pattern by fluorescence spectrophotometry. We observed tumor-suppression efficacy in vivo through animal experiments.</p><p><b>RESULTS</b>We successfully prepared nanoparticles with MAGE-3 peptide antigen, and its encapsulation efficiency and loading level were about 37% and 17.0%, respectively. These nanoparticles presented a delayed release pattern in phosphate buffered saline (PBS) at pH 7.4, and the full release time was about 48 h. In 2 mg/mL lysozyme, the nanoparticles showed a sudden release, and the full release time was about 24 h. ELISPOT and cytotoxic experiments showed that the MAGE-3 peptide loaded nanoparticles could stimulate immune response in vivo and could generate MAGE-3-targeted cytotoxic T lymphocytes (CTLs), and kill MAGE-3-specific tumor cells. Tumor suppression experiments showed that the regression ratio of the peptide-loaded nanoparticles group was 37.81%.</p><p><b>CONCLUSIONS</b>MAGE-3 peptide/chitosan-deoxycholic acidvaccine-loaded nanoparticles can stimulate antitumor immune response in vivo and can regress the growth of mouse forestomach carcinoma cell line MFC.</p>

The evaluation analysis of CT images in diagnosis of hip lesions / 中国基层医药

Objective To illustrate with CT manifestations,diagnosis hip lesions in the evaluation of CT of the value of clinical diagnosis. Methods Retrospective analysis of 126 cases of pathologically proven or CT signs with avascular necrosis, 32 cases, degenerative osteoarthritis (oa) was 24 patients with ankylosing spondylitis, hip changes in 8 cases, hip inflammatory change( including 19 cases were tuberculosis), 17 cases of metastases ,femoral neck hip fracture, or 26 patients. 126 patients using conventional bilateral hip contrast CT scan, a thick layer of 5 mm,spacing 5 mm. Results The necrotic showed the femoral hardening, capsule became subchondral fractures, and advanced osteoarthritis secondary changeed; Degenerative joint disease to bearing zone joint deformities and joint osteoarthritis,cystic changed subchondral particularly variable;Ankylosing spondylitis involving the hip joint performed for the acetabular serrate or brush shape;Hip joint tuberculosis was widely bone destruction, small dead bone and cold sex abscess;In rheumatoid arthritis,joint space was commonly narrow and under the face there was no obvious bone cyst hardening;Around synovial osteochondromatosis tumour disease showed synovial thickening and overses microcalcifications, bone and cartilage the mulberry. Conclusion CT can clearly show the pathological anatomy and hip, scope and anatomic details in the differential diagnosis of disease development,and has great advantages in clinical observation.

Study on repair of full-thickness skin defect with collagen-chitosan dermal stent in pigs / 中华外科杂志

<p><b>OBJECTIVE</b>To investigate angiogenesis of collagen-chitosan porous scaffold, and to study survive of skin grafts on the scaffold after bilayer dermal equivalent (BDE) was transplanted on wounds with full thickness skin defects.</p><p><b>METHODS</b>The full thickness skin defects were made on 10 Bama miniature pigs and the BDE composed of collagen-chitosan porous scaffold and silicone membrane was transplanted on wound. Angiogenesis in dermal equivalent, wound healing, and healing and survive of skin grafts on dermal equivalent were observed in 1, 2, and 3 weeks after the BDE transplantation. At the same time, CD34 positive signals (neo-forming micro-vessels) were detected by immunohistochemical staining.</p><p><b>RESULTS</b>Inflammatory cells and fibroblasts infiltrated into dermal equivalent and a few new micro-vessels had been formed in 1 week after the BDE transplantation; neo-forming micro-vessels perpendicular to wound bed had increased significantly in 2 weeks after the BDE transplantation; neo-forming micro-vessels could be observed in almost all dermal equivalents in 3 weeks after the BDE transplantation. CD34 positive signals (neo-forming micro-vessels) in 3 weeks after the BDE transplantation was much more than those in 2 weeks after the BDE transplantation, and CD34 positive signals in 2 weeks after the BDE transplantation was much more than those in 1 week after the BDE transplantation. Survival rate of intermediate split thickness skin graft were 10%, 70% and 100% respectively after the skin grafts had been grafted for 2 weeks on surface of the scaffold which had been transplanted for 1, 2 and 3 weeks. Epidermis which had been grafted on surface of the scaffold for 1 or 2 weeks could perfectly survive after BDE had been transplanted for 1 or 2 weeks.</p><p><b>CONCLUSIONS</b>Collagen-chitosan porous scaffold plays a very important role in wound healing of full thickness skin defect and can induce fibroblast infiltration and new micro-vessel formation. Epidermis grafted on surface of collagen-chitosan porous scaffold can perfectly repair wounds, and it has brilliant applied prospects in repairing skin defect.</p>

Clinical observation on injection of small dose of morphine into Neiguan (PC 6) for treatment of chest pain in the patient with acute myocardial infarction / 中国针灸

<p><b>OBJECTIVE</b>To probe into an effective injection way of Morphine for treatment of chest pain of acute cardiac infarction.</p><p><b>METHODS</b>Ninety cases of myocardial infarction were randomly divided into 3 groups, an acupoint-injection group, an intravenous injection group and a hypodermic injection group, 30 cases in each group. The acupoint-injection group were treated with injection of 2 mg Morphine into bilateral Neiguan (PC 6) respectively, and the intravenous injection group with intravenous injection of 5 mg Morphine and the hypodermic injection group with hypodermic injection of 5 mg Morphine, and other treatments were same in the 3 groups. The analgesic effects were assessed with visual analogue scale (VAS) 5, 10, 30, 60 and 180 minutes after treatment and the complications were observed.</p><p><b>RESULTS</b>There were no significant differences among the 3 groups before treatment in the VAS score (P > 0.05). The analgesic effect in the acupoint-injection group was better than those in other two groups 5 min, 30 min and 180 min after treatment (all P < 0.01). The incidence rate of nausea and vomiting of 0.3% in the acupoint-injection group was significantly lower than 40.0% in the intravenous injection group and 20.0% in the hy podermic injection group (all P < 0.01).</p><p><b>CONCLUSION</b>Injection of small dose of Morphine into Neiguan (PC 6) has a definite therapeutic effect on chest pain of acute myocardial infarction with earlier analgesic effect, smaller dose of Morphine, longer analgesic duration and less complications.</p>

Evaluation on current malaria prevalence using capture-recapture method in national sentinel surveillance points malaria / 中华流行病学杂志

<p><b>OBJECTIVE</b>To explore the feasibility of using the capture-recapture method (CRM) for national malaria sentinel surveillance program and to evaluate the malaria prevalence at those points.</p><p><b>METHODS</b>By CRM to compare data on malaria cases reported from national sentinel surveillance program and those from the registration of case report system (CRS). Analysis was made to express the difference regarding the number of cases in order to get the estimates and the incidence rate.</p><p><b>RESULTS</b>The incidence in the relative higher epidemic area, unstable epidemic area and relative lower epidemic area were 1247.30/100000, 171.50/100000 and 46.10/100000, respectively. The rate of miss-reporting malaria cases in these areas were 65.20% ,45.32% and 66.67%, respectively.</p><p><b>CONCLUSION</b>The situation of the malaria cases in the national sentinel surveillance points could be estimated,using the CRM.</p>

Effect of IL-15 on the proliferation, differentiation and anti-apoptosis of CD34+ cells in patients with MDS / 中国实验血液学杂志

To study the effect of interleukin-15 (IL-15) on the proliferation, differentiation and apoptosis of MDS CD34(+) cells, CD34(+) cells of high enrichment were separated by MACS system, and cultured in liquid media with different concentration of IL-15 in treated group and without IL-15 in the control group. Apoptosis of hematopoietic precursors was assayed by propidium iodine staining and cell by FCM, and the other MDS CD34(+) cells were stained by cytochemical staining after culture. The results showed that after culture with IL-15 the proliferation and differentiation of MDS CD34(+) cells were obviously promoted. It was found the every lineage of mature cells developed, the expressions of cell surface antigens CD71, CD33 and CD19 all increased in the MDS CD34(+) cell treated with IL-15. It is suggested that IL-15 stimulates the proliferation and differentiation of MDS CD34(+) cells, and partly shows anti-apoptosis effects which may be applicable to the therapy MDS.