Bio-safety problem was emerging as more and more important with the development of biotechnology,and many governments concerned about it.We analyzed the different category of biotechnology related with bio-safety problem,and found out its main influencing factors and safety results.In the course of research and development of biotechnology,misuse,abuse and non-moral use are three main human factors.We concluded that the situation of bio-threat would be more diverse,and also the misuse chance would increase.It will be benefited that public health manager make regulations and legislature with full dimension of bio-safety assessment of different biotechnologies.

Burns ; therapy ; Cicatrix ; therapy ; Ear Canal ; pathology ; Humans ; Treatment Outcome

BACKGROUND:Previous researches have focused on the effect of phosphorus compounds on stem cels from animals or from human. But there is no study on the effect of phosphorus ions on human bone marrow mesenchymal stem cels under three-dimensional culture. OBJECTIVE:To explore the effect of phosphorus ions on human bone marrow mesenchymal stem cels under three-dimensional culture. METHODS:There were six groups in the experiment. Human bone marrow mesenchymal stem cels were inoculated in three-dimensional polystyrene scaffolds and then subjected to serum-free growth medium (group 3-GM) or serum-free growth medium containing 4 mmol/L (group 3-4P), 8 mmol/L (group 3-8P) phosphorus ions for 21 days, respectively. Cels cultured on the two-dimensional polystyrene scaffolds were used as control groups (groups 2-GM, 2-4P, 2-8P). Celular proliferation was examined by cel counting kit-8; the mRNA expressions of osteogenic marker genes were assessed by RT-PCR; the formation of mineralized nodules for the osteogenic differentiation of human bone marrow mesenchymal stem cels was examined by Alizarin red staining. RESULTS AND CONCLUSION:Compared with the two-dimensional culture, the growth of human bone marrow mesenchymal stem cels induced by phosphorus ions were more obvious in the three-dimensional polystyrenes scaffolds at days 4, 7, 14 and 21 (P < 0.05). Compared with the group 3-GM, the mRNA expression of colagen type I in groups 3-4P and 3-8P increased more significantly at days 7 and 14 (P < 0.05); the mRNA expression of alkaline phosphatase in groups 3-4P and 3-8P increased more significantly at day 14 (P < 0.05); the mRNA expression of osteocalcin in groups 3-4P and 3-8P increased more significantly at days 14 and 21 (P < 0.05). Mineralized nodules were formed in groups 3-4P and 3-8P but not in group 3-GM at day 21. So we concluded that phosphorus ions can promote proliferation and osteogenic differentiation of human bone marrow mesenchymal stem cels in three-dimensional polystyrenes scaffolds. Compared with the two-dimensional cel culture, the promoting growth effect of phosphorus ions on human bone marrow mesenchymal stem cels in three dimensional polystyrenes scaffolds are more obvious.

Objective To compare the clinical effects of the volar locking compression plate (LCP) and external fixator in the treatment of the AO type-C distal radial fractures.Methods From October 2007 to October 2010,64 cases of AO type-C distal radial fractures which had been treated with volar LCP and external fixator were retrospectively analyzed respectively.LCP group consisted of 38 patients,including 13 males and 25 females with an average age of 45.1 years.According to AO/OTA classification,there were 15 type-C1,18 type-C2,and 5 type-C3.External fixator group consisted of 26 patients,including 12 males and 14 females with an average age of 47.1 years.There were 11 type-C1,13 type-C2,and 2 type-C3.Outcomes were assessed by radiographic parameters,function parameters,and Gartland-Werley functional score.Results All the patients were followed up.X-rays showed all fractures healed.LCP group was followed up for an average of 23.8 months.External fixator group was followed up for an average of 31.2 months.According to the Gartland-Werley score,the excellent and good rate was 81.6％ in the LCP group and 76.9％ in the external fixator group,with a Gartland-Werley score of 4.50±3.55 and 5.04±3.74 respectively.There were no significant differences in wrist flexion,extension,ulnar deviation,radial deviation,pronation,supination,the parameter of ulnar inclination and radial height and the Gartland-Werley score.The volar tilt was better in the LCP group than in the external fixator group.There were 2 cases of wound infection,1 case of median nerve injury,1 case of plate loosening in LCP group; 3 cases of pin tract infection,1 case of fixator loosening,and 2 cases of wrist stiffness in the external fixator group.Conclusion LCP group had better imaging outcomes with a reliable fixation,but both of the groups can achieve satisfactory clinical results.The choices of treatment method depend on the patient's clinical conditions.

BACKGROUND: Most of studies focus on the biomechanical characteristics of thoracic spine neoplasm, but there is little report on the fracture risk in the patients with vertebral hemangioma through finite element analysis.OBJECTIVE: To establish a finite element model of vertebral hemangioma, and to analyze its biomechanical characteristics, and assess the risk of vertebral fracture.METHODS: Three-dimensional finite element models of T12-L2 vertebrae from normal individuals, the patients with vertebral hemangioma (hemangioma accounting for 20%, 40%, 60%, 80% of the vertebral cancellous bone) and bone cement filling were established, respectively, and then the mechanical characteristics were analyzed. The stress distribution and characters of each model were determined under a vertical static pressure of 600 N.RESULTS AND CONCLUSION: (1) Three-dimensional finite element models of T12-L2 vertebrae were established successfully. Under static pressure, the stress distribution of L1 cortical bone showed no significant difference among models, and the maximum stress all occurred at the base of pedicle, zygapophysial joint and isthmus. (2) The stress distribution did not differ significantly between vertebral hemangioma accounting for 20%-40% of vertebral cancellous bone with complete cortical bone and normal ones, but which differed significantly in hemangioma accounting for 60%-80%. (3) To conclude, the established thoracolumbar three-dimensional model is available. Additionally,biomechanical tests manifest that the completeness of cortical bone and destruction ratio of cancellous bone destruction are key factors for the fracture risk of vertebral hemangioma.

Objective To investigate the prevalence and influential factors of anxiety and depression in patients with non-organic dyspnea.Methods Data of 68 patients with non-organic dyspnea who were in emergency department of ShunYi Hospital China Medical University and department of emergency,Beijing Chaoyang Hospital from January to May in 2014 were collected.All the subjects were assessed with Hospital Anxiety and Depression Scale.Comparative analysis of influencing factors such as age,gender,educational level,type of inhabitant,etc.were conducted.Results Of all the subjects,22 cases (32.4％) were identified as anxiety,14 cases (20.6％) as depression.Patients of non-organic dyspnea with anxiety were more frequently seen in female,with lower education level,rage pre-hospital and nonnative inhabitant.Patients of non-organic dyspnea with depression were more frequently seen in lower education level,rage prehospital and nonnative inhabitant.Univariate and multivariate logistic regression analysis showed lower education level,rage pre-hospital and nonnative inhabitant were the major risk factors on anxiety and depression.Conclusions Patients with non-organic dyspnea had high prevalence of anxiety and depression.More attention should be paid to these patients.

Objective To establish a rat model of liver metabolism profile in chronic heart failure (CHF), to explore the dynamics of liver metabolism in CHF from the point of view of metabolism, and to find the characteristic metabolites valuable for the molecular mechanism and management of CHF.Methods Twenty male Wistar rats were assigned to the CHF group to receive aortic coarctation or to the control group to receive sham surgery, and were bred for 24 weeks following surgery.The metabolic profiling of the rat liver tissues was analyzed on a metabonomics research platform. Orthogonal partial least squares-discriminant analysis ( OPLS-DA) model and principal component analysis ( PCA) model were established for liver tissues of the CHF rats, and the characteristic metabolites were finally derived by data processing with SPSS 19.0 software.Results The PAC and OPLS-DA models were established successfully.Ten characteristic metabolites with significant differences between the CHF and control groups, including lysophosphatidyl choline, lysophosphatidyl ethanolamine, oleic acid, glycocholic acid, and dehydroepiandrosterone sulfate, were screened and identified from the models.Conclusions The metabolic disorders in CHF rats are well fitted to the established metabolic profile models, and these identified characteristic metabolites may provide reference for the pathophysiological molecular mechanism and management, etc., of chronic heart failure.

Objective To identify the clinical significance of low triiodothyronine syndrome and the potential impact of triiodothyronine (T3) on prognosis in critical patients.Methods A total of 150 critically ill patients enrolled from October 2012 to April 2013 were divided into two groups,namely low thyroidhormone group (n =38,group A) and normal T3 group (n =112,group B).APACHE Ⅱ scores of patients were recorded at admission and thyroid hormone levels were measured on the first and the third day after admission.Then the survival state of 28-day in each group was observed and then the relationship between prognosis and T3 levels was analyzed by receiver operating characteristic (ROC) curve.Results About 25.3％ of 150 critical patients were suffered from low thyroidhormone syndrome and the mortality rate in this group was 42.1％,which was much higher than 29.5％ in normal T3 group.There was no difference in prediction of death rate analyzed by ROC curve between the T3 level and APACHE Ⅱ scores.The area under curve of T3 level was 0.768 (95％ CI:0.701-0.835) and APACHE Ⅱ was 0.783 (95％CI:0.719-0.846).Best cut-off value of T3 level was 0.41 ng/mL resulting in 76.6％ sensitivity and 78.4％ specificity.Conclusions Critically ill patients complicated with low thyroidhormone syndrome has poor prognosis and T3 may be a predictive marker in evaluating the prognosis of critically ill patients.

Objective To evaluate the clinical effect of postural reduction and bracing on thoracolumbar fractures without neurological deficit.Methods21 patients with thoracolumbar fractures(T11～L2

Objective To analyze the effect of Shuxuetong injection on microcirculation in patients with septic shock and its therapeutic effect. Methods A prospective study was conducted. Eighty patients with septic shock treated in Department of Critical Care Medicine of Hebei Provincial Traditional Chinese Medical Hospital were randomly divided into a Shuxuetong group and a conventional therapy group according to random number table, 40 cases in each group. The conventional treatment in the two groups was energetically carried out in accord to the sepsis shock guidelines, such as positive fluid resuscitation, anti-infection, etc. In the Shuxuetong group, additionally Shuxuetong injection 6 mL in 5% glucose injection 250 mL intravenous drip was given once a day for 7 days. The levels of urine output, lactic acid (Lac), blood urea nitrogen (BUN), creatinine (Cr), aspartate aminotransferase (AST), alanine aminotransferase (ALT), left ventricular ejection fraction (LVEF), and cardiac index (CI) in the two groups were observed before and after treatment; the total dosages of dopamine, dobutamine, noradrenaline, etc. vascoactive agent used for the patients and 28-day mortality in the two groups were also recorded. Results The comparisons of levels of urine output, Lac, BUN, Cr, AST, ALT, LVEF, and CI before treatment between the two groups were of no statistical significant differences (all P>0.05). After treatment in the two groups, the urine output, LVEF, and CI were increased compared with those before treatment, whereas the Lac, BUN, Cr, AST, and ALT were significantly decreased, and the changes were more obvious in Shuxuetong group [urine output (mL/h):112.1±39.8 vs. 73.3±28.5, LVEF:0.49±0.15 vs. 0.44±0.14, CI (mL·s-1·m-2):66.2±5.7 vs. 54.2±6.2, Lac (mmol/L):3.83±1.65 vs. 4.72±2.25, BUN (mmol/L):7.1±2.7 vs. 9.3±3.5, Cr (μmol/L): 73.9±16.2 vs. 95.7±15.8, AST (U/L): 39.8±9.5 vs. 45.8±12.7, ALT (U/L):34.3±9.7 vs. 41.7±11.3, all P<0.05]. The total dosages of all kinds of vascoactive agent of Shuxuetong group were remarkably less than those in the conventional therapy group [dopamine (mg): 993.1±261.7 vs. 1 340.9±356.4, dobutamine (mg):776.2±281.0 vs. 1 049.2±364.3, noradrenaline (mg):56.4±34.6 vs. 107.6±51.3, all P<0.05]. The 28-day mortality of Shuxuetong group was obviously lower than that of conventional therapy group [40.0%(16/40) vs. 60.0%(24/40), P<0.05]. Conclusion Shuxuetong injection can improve the microcirculation perfusion in patients with septic shock and reduce their mortality.