Objective To summarize the progresses in laboratory animal science in civil and military fields,and explore the problems existed in development of laboratory animal science in PLA. Methods Literature concerning the laboratory animal science published domestically and abroad were retrospectively and descriptively analyzed. Integrated with the practices on laboratory animal science,the strategies and suggestions for future development of laboratory animal science in PLA were herewith presented. Results Considerable developments have been achieved in the laboratory animal science in PLA,including the improved productive facilities and experimental conditions,and preliminarily established system of traiming of personnal. However,compared with the development level of laboratory animal sciences at home and that of abroad,such disparities as heterogeneity in quality of experimental animals from different breeding institues,lower standard in experimental technology,poorer foundation in the development of animal model special for military purpose,and lack of strategic reserve of laboratory animal resources,etc could still be found. Conclusions The development of laboratory animal science in PLA should depend on a combination of military efforts and civilian support,with establishment of the mechanism to share resources and professional personnel. Meanwhile a long-term mechanism should be developed for professional training of personnel in breeding experimental animals for researches in the field of military medicine,in order to establish a truly fundamental discipline of animal science for research of military medical sciences.

Objective To understand the needs for and supply of clinical research consultation at the clinical epidemiological unit (CEU) in a general hospital. Methods Data were collected from work records of 2008 of CEU and were analysed. Results There were three faculties and three graduate students in the CEU, who altogether provided 272 consultations in 2008. 147 of the consultants were doctors (54.0%), and 90 were graduate students (33.1%). With regard to the content of consultation, 106 (39. 0%) were for bio-statistical methods, 96 (35. 3%) for project design, 36(13.2%) for paper writing and 24 (8.8%) for others. The professor of the CEU provided more consultation on project design (71/139, 51.1%) than assistant professors (22/151, 19.1%) and graduate students (3/18, 16.7%) (P＜0.01). The assistant professors (66/151, 57.4%) and graduate students (10/18, 55.6%) provided consultation on bio-statistical methods more than the professor (30/139, 21.6%) (P＜0. 01). Conclusion Doctors and graduate students in the general hospital need clinical research consultation service from the CEU. It is necessary and possible to establish a CEU in general hospital to meet the needs of clinical epidemiological consultation. The free consulting policy is effective in improving the accessibility and satisfaction of the consulting service.

AIM: To investigate the relationship between CD200~+CK7~+ trophoblasts and the resorption of embryos in a poly (I∶C)-induced abortion model. METHODS: The status of CD200 expression was investigated in Balb/c?C57BL/6 and Balb/c?Balb/c mice as induced model of embryo-resorption by an i.p. injection of poly (I∶C). CD200 expression on CK7~+ cells from placentas was detected with flow cytometry. CD200~+ cells in placenta were observed with immunocytochemical staining. RESULTS: Both the percentage and absolute number of CD200~+CK7~+ cells were dramatically decreased by injection of poly (I∶C) in Balb/c?C57BL/6 (6.3%?6.2% vs 36.1%?9.3%, P

Objective To evaluate the ethical management status quo of Capital Medical Research Fund in 2007.Methods Cross-sectional study was applied to analyze the ethics management and ethics self-evaluation in applications.Results There were 652 applications,covering with 14 districts and 2 counties in Beijing,from 128 Hospitals.Applicants have some knowledge of the ethical issues in clinical research accounted for 88.7％ ; informed consent of subjects considered in 72.5％ ;the potential risk and protection involved in application accounted for 62.0％; personal privacy protection of subject accounted for 49.4％.Unfortunately,the benefit vs risk assessment was only involved in 28.7％ applications.Applicants from general hospitals had more ethical issue knowledge (90.2％) than those from community hospitals (84.6％).Applicants from university hospitals had more ethical issue knowledge (93.9％) than those from military hospitals (80.2％).Applicants aged 55 0r over had less ethical issue knowledge (70.0％) than other applicants (89.2％).The applicants to study on descriptive research and etiological research had less ethical issue knowledge than others.578 applications filled out the approval from ethics committee or research management department.62.6％ of the written were acceptable.Conclusion The applicants for clinical research had preliminary understanding for ethical issues in Beijing in 2007.Hospital ethics committees or research management departments had conducted clinical research ethical review applications for funds management.It has taken place the external conditions to carry out the ethical management in clinical research fund management.

Overall enhancement of the public health system ranks a key task and goal for the ongoing health reform.This paper described the public health development in Shenzhen amid the ongoing health reform.Shenzhen has achieved the following objectives as required in the reform:better public service by public health institutions,availability of major and primary public health services as required by the state and city,overall elevation of public health service capabilities,and significant drop of disease morbidity and mortality.Challenges ahead include room of improvement in public health service network,incentive mechanism of public health service providers,and that of public health service delivery capability.

Objective: To study the attenuating effect of angiotensin I type 1 receptor antagonist losartan and an-giotensin converting enzyme inhibitor captopril on aortic atherosclerosis in rabbits. Methods: Thirty-one male New Zealand rabbits were randomly divided into 5 groups:control group,high cholesterol diet group,losartan group, captopril group and combined drug administration groupdosartan+captopril). The animals were killed after 16 weeks and the serum total cholesterol ,triglyceride, high and low density cholesterol .atherosclertic ratio,endothelin,NO,plaque area percentage,aortic cholesterol content and vascular smooth muscle cell (VSMC) apoptosis were determined. Results:The plaque area percentage,aortic cholesterol contents and endothelin levels of 3 drug treatment groups were significantly lower than that of high cholesterol group,NO contents and VSMC apoptosis were significantly higher. Conclusion:Losartan and captopril can attenuate aortic atherosclerosis induced by high cholesterol diet .combined administration of the 2 drugs at low doses are more effective. The mechanism may be related to the protection of endothelial function and the effect on apoptosis of VSMC.

AIM: To study mitochondrial mass and structural protein changes in dexamethasone (DEX)-mediated mouse thymocyte apoptosis process. METHODS: DEX-induced mouse thymocyte apoptosis model was established. Annexin V-FITC/PI double staining was used to identify apoptotic and necrotic cells by flowcytometry, JC-1 staining was adopted to test mitochondrial membrane potential (△?_m), and cellular structural protein changes were studied with CFDA-SE staining. RESULTS: By 1?10~(-6) mol/L DEX stimulation, the apoptotic rate was 51.25%?5.51% and had significantly difference from control group (12.03%?2.00%); the necrotic rate in DEX group was 30.25%?3.67% and also had significantly difference from control group (10.11%?1.11%, P

Humans ; Noise, Occupational ; Normal Distribution ; Textiles

BACKGROUND:Massive blood loss was caused by an over-reactive fibrinolytic system, as a sequence of tourniquet usage and surgery trauma in total knee arthroplasty. As an antifibrinolytic drug, tranexamic acid has been proven to decrease not only the obvious and total blood loss, but also the ratio of alograft blood transfusion in total knee arthroplasty. Nevertheless, the effect of tranexamic acid on hidden blood loss in total knee arthroplasty had not been clarified yet. OBJECTIVE: To observe the effect of intravenous infusion of tranexamic acid on hidden blood loss in primary total knee arthroplasty. METHODS:Clinical data of 54 patients who received primary unilateral total knee arthroplasty in the Third Hospital, Peking University from June to December 2013 were retrospectively analyzed. They were divided into two groups according to the use of tranexamic acid. 22 patients in the tranexamic acid group were given 2 g tranexamic acid by intravenous infusion during surgery. 32 patients in the control group were given an equal volume of physiological saline. Patients in both groups were oraly given anticoagulant rivaroxaban after replacement. Hemoglobin level and blood hematocrit were recorded before and after surgery for 5 consecutive days. The total amount of blood loss and hidden blood loss were calculated by using Cross equation. The difference in the amount of blood loss was compared between the two groups. Lower extremity venous ultrasound examination was conducted at 1 week after replacement to determine deep venous thrombosis in the lower limb. RESULTS AND CONCLUSION:No significant difference in general data and perioperative conditions was detected between the two groups (P > 0.05). Postoperative drainage, dominant blood loss, total blood volume, the amount of autologous blood transfusion and the amount of alogeneic blood transfusion were significantly less in the tranexamic acid group than in the control group (P < 0.05). According to Gross formula, the difference of hidden blood loss was statisticaly significant between the tranexamic acid group (302.9±189.9) mL and the control group (596.8±271.4) mL (P < 0.05). Deep vein thrombosis appeared in one case between the two groups after replacement. Results indicate that intravenous infusion of tranexamic acid dramaticaly decreased the hidden blood loss in unilateral total knee arthroplasty, reduced alogeneic blood transfusion, and simultaneously did not increase the incidence of deep vein thrombosis in the lower limb.