With the development of technology and economy, the whole living space has been filled with different vibration, the chance of exposure to vibration for people is on the increase. Environmental vibration is one of seven main pollutions in the world, people’s health is threatened. The main four factors effected human body vibration were introduced in this paper, and the adverse effects on the systems were discussed, the criterion of evaluating human response to vibration based on international and national standards were analyzed.

Objective To study the mechanism of steroid induced necrosis of femoral head. Methods The cell experiment of effect of dexamethasone on the osteoblast in vitro and animal experiment of steroid induced necrosis of femoral head. Results The cell experiment showed that dexamethasone played two roles to bone marrow' mononucleate cells in vitro. The first was that it can prevent the cells from differentiating into the osteoblasts and the second was that it can cause fatty degeneration. The animal experiment showed the number of vacant bony lacunae in femoral head, the average diameter of fat cells in marrow cavity were increased and the number of blood vessles in subchondral areas was decreased with large doses of dexamethasone. Conclusions The mechanism of steroid induced necrosis of femoral head was that dexamethasone can inhibit the grouth of the osteoblasts directely, and cause fatty proliferation of bone marrow resulting in disorder of micro circulation and osteonecrosis in the femoral head.

Objective To construct vectors based on adeno-associated virus type 2 (rAAV2) carrying bone morphogenetic protein-7 (BMP-7) and observe their expression in adipose-derived adult stem cells, which can be served as a new gene therapy method and cell source for bone tissue engineering. Methods The coding sequence (1. 3 kb) of BMP-7 was amplified by PCR from the pcDNAl. 1 ( + ) plasmid containing the human BMP-7 cDNA. After purified, the gene fragments were cloned into a plasmid pUC18 and termed plasmid pUC18-hBMP7. The recombinant pUC18-hBMP7 was digested and further ligated to the pSNAV by T4DNA ligase and termed plasmid pSNAV-hBMP7. BHK-21 cells were transfected with the purified pSNAV-BMP7 plasmid according to a standard calcium phosphate precipitation method. The cells were isolated and the integrity of hBMP7 gene was determined by polymerase chain reaction (PCR) using the above PCR primers. To package the virus, stably transfected BHK-21 cells were subsequently infected with recombinant herpes simplex virus type 1 (rHSV-1). The collected cells were processed by chloroform treatment, PEG8000/NaCl precipitation and chloroform extraction for purification. The tiler was determined using quantitative DNA dot blots and the purity was examined by sodium dodecyl sulphatepolyacrylamide gel electrophoresis. Following infection with rAAV2-BMP7 at multiplicities of infection of 1?105 vector genomes per cell and subsequent culture, adipose-derived adult stem cells were assessed qualitatively for BMP7 production. Results The recombinant plasmid pSNAV-hBMP7 was identified by PCR and digested with restriction enzyme. Transfection showed an efficiency of 90 % in ADAS cells. BMP-7 expression in ADAS cells was identified by Western blot. Conclusions The hBMP-7 recombinant adeno-associated virus vectors can be successfully constructed in vitro and rAAV2-hBMP7 can infect ADAS cells.

Objective To explore the analgesic effect of dicaine combined with penetration en-hancer applied to venipuncture with venous indwelling needle. Methods 60 patients treated with selec-five operation under epidural anesthesia were divided into the control group and the experimental group with 30 patients in each group. The control group was treated with conventional method of venipuncture. The experimental group was externally applied with dicaine combined with penetration enhancer 50 min-utes before the venipuneture in basilic or cephalic vein. Local reactions were observed after venipuncture and the analgesic effects were evaluated with visual analogue scale(VAS 0～100 mm). Results The analgesic ef-fect in the experimental group was obviously better than that of the control group with a significantly lower VAS. The maintaince of analgesic time in the experimental group lasted above 90 minutes. Condusious The analgesic effect of dieaine combined with penetration enhancer can be approved with a very high analgesia rate, its onset time is much shorter than conventional method and maintenance time is much longer.

In recent years,clinical immunology has an increasing variety of prominent applications in the field of chronic hepatitis B infection.On one hand,the discovery and identification of the mechanisms of pathogen recognition by the innate immune system,novel immune cell subpopulations and immunoregulatory pathways further enriched the immunological pathogenesis of chronic hepatitis B.On the other hand,the development of new immunotherapy strategies aimed at reconstructing the antiviral immunity,including agonists of Toll like receptors,immune cell therapies and therapeutic vaccines,have provided several new targets for the optimization of antiviral therapy strategies and brought new opportunities for patients of chronic hepatitis B to obtain HBsAg clearance and clinical cure.

Clinical education for undergraduates in China can be divided into three phases:preclinical phase,clinical clerkship phase,clinical practice phase,and each phase has its own features and different teaching tasks.Currently there are four teaching methods mostly applied in clinical education:lecture-based Learning (LBL),team-based learning (TBL),case-based learning (CBL) and problem-based learning (PBL).LBL is a teacher-centered.teaching method,which focuses on making knowledge accurate,systematic and comprehensive;TBL,CBL and PBL are student-centered teaching methods,which can improve students' enthusiasm and subject initiative.Each teaching method has advantages and dis-advantages.According to the different characteristics of three stages of medical education,this paper analyzes the reasonable application of different medical teaching methods in three stages of undergraduate medical education:in preclinical stage,combining LBL with TBL teaching methods;in clinical clerkship phase,combining the teaching methods of LBL,TBL and CBL;in clinical practice stage,combining CBL with PBL teaching methods.

Objective To establish an animal behavioral model of tinnitus with step -down test ,and make use of the model to analyze the tinnitus genesis site in the salicylate-rats .Methods Forty wistar rats were includscl in this study ,they were randonly into 2 groups(experinent group and constrot group ,20 rats each group) .Ascertain that the animals treated with sodium salicylate(SS) have the sensation of tinnitus with the method of step -down test behavioral model .After having established a behavioral conditioned reflex ,subjects responded correctly to jump onto a climbing pole after hearing the sound .Then animals were under bilateral auditory nerves section ,to test whether the ablated-animals could still jump onto the pole after being treated with SS .Results Animals with the ab‐lating surgery could seldom jump onto the pole ,only reaching 1 .59 ± 0 .12 times average per 10 tests .Compared with con‐trol group ,there were significant differences with t-Test (P<0 .05) ,suggesting that subjects could not hear the tinnitus after the surgery .Conclusion Sodium salicylate could not make the animals with bilateral auditory nerves section to have the sensation of tinnitus .The peripheral auditory system plays an extremely important role in salicylate-induced tinnitus .

Objective: To investigate the relationship of murine fibrinogen-like protein 2(mfgl2) / fibroleukin with pulmonary impairment in the murine model of severe acute respiratory syndrome(SARS).Methods: The Balb/cJ mice infected with murine hepatitis virus strain 3(MHV-3) through the trachea were observed for the pathological features and virus distribution in different organs.The expressions of both mfgl2 and fibrino in the lungs were determined by in situ hybridization and immunohistochemistry.Results: The MHV-3 infected mice developed typical interstitial pneumonia with extensive hyaline membrane formation in the alveoli,presented micro-vascular thrombosis in the pulmonary vessels and died within 5 days.MHV-3 virus replication was identified in all the organs observed.The specific expression of mfgl2 prothrombinase was noted in the terminal and respiratory bronchioles,alveolar epithelia and infiltrating cells.Conclusion: The characteristics of the pulmonary impairment of SARS in human can be properly simulated by the MHV-3 induced murine model of SARS.The up-regulation of the specific gene mfgl2 in the lungs involved in fibrino deposition and microvascular thrombosis may be largely responsible for SARS-associated pulmonary damages.

Objective To optimize the prescription of preparation technology of Xiaoer Qingfei Dispersible Tablets. Methods The filler, disintegrant, adhesive, lubricant, and drug loading were screened by single factor tests. The combined application proportion of three disintegrating agents, PVPP, CMS-Na, and L-HPC, were optimized by orthogonal test. Results The best prescription of preparation technology of dispersible tablets:microcrystalline cellulose as filler;silica gel powder as lubricant;75%alcohol as the adhesive;PVPP, L-HPC, and CMS-Na as combined disintegrants (L-HPC∶PVPP∶CMS-Na=4∶3∶6). The disintegration time of prepared dispersible tablets was less than 3 minutes, and all through the No.2 sieve. Dispersible uniformity was in accordance with the provisions. Conclusion Xiaoer Qingfei Dispersible Tablets prepared by the optimized preparation process are stable and feasible, and suitable for clinical application.

Objective To investigate the value of bone marrow imprints in the cytomorphology diagnosis.Methods A total of 354 cases of bone marrow smears,imprints,and sections were analyzed from January 2011 to December 2013 to detect morphological diagnosis difference.Results Bone marrow imprints in groups of extremely reduced,significantly reduced,normal,slightly increased,increased significantly,and extreme increase were better than that of smear which nucleated cells quantity assessment(P ＜ 0.01).Smears and imprints were similar (P ＞0.05).Imprints nucleated cell number decreased mostly were the same as smear,but smear reduced imprints mostly normal or increased.The bone marrow sections nucleated cells quantity as the standard,smears and imprints had high coincidence rate in the group of nucleated cells reduced (87.5％ and 96.9％),and imprints were higher than smear in the group of nucleated cells quantity in normal and increased(87.8％ and 95.7％ vs 68.3％ and 55.8％),and the difference was statistically significant.Imprints were better than smear in specificity,Youden index,and sensitivity.Patients with plasma cell myeloma (PCM) imprint plasma cell volume and immature plasma cells were higher than that of smear (42.73 ± 10.47 and 13.60 ± 4.83 vs 24.67 ± 11.18 and 11.07 ± 5.82) with a statistically significant difference (P ＜ 0.05).Conclusions Imprints have characteristics both smear and sections,and imprints are superior to smears in assessment of nucleated cells and tumor cell invasion degree.Smear combined with imprints can improve the diagnosis level of bone marrow cell cytomorphology.