BACKGROUND:Bionic structure is one of the most important goals of scaffold design in tissue engineering. However, the majority of the bionic scaffolds do not have the capacity of sustained release of growth factors.
OBJECTIVE:To fabricate a novel biomimetic nanofibrous heparin/gelatin scaffold and investigate the characterization of the scaffolds including the microstructure, the mechanical strength andin vitro recombinant human bone morphogenetic protein-2 (rhBMP-2) release.
METHODS:Heparin-conjugated gelatin was prepared by chemical crosslinking and mixed with gelatin at different ratios. Nanofibrous composite scaffolds with different ratios of heparin-conjugated gelatin (0, 20% and 40%) were fabricated by using a thermaly induced phase separation combined with particle leaching technique. The amount of conjugated heparin in the scaffolds, scaffold microstructures and mechanical strength were detected and observed. The release kinetics of rhBMP-2 from the scaffolds with different concentrations of heparin conjugated gelatin was detected using ELISA method.
RESULTS AND CONCLUSION:The composite scaffolds possessed abundant porosities, good mechanical properties, and biomimetic nano-structures. The macroporous size was 250-420 μm. When the ratio of heparin-conjugated gelatin was 0, 20% and 40%, the content of heparin in the scaffolds was 0, (12.82±2.49) and (25.08±3.69) mg/g, respectively, with significant differences; the elastic modulus of the composite scaffolds was (299±38), (286±40) and (236±33) kPa, respectively, with insignificant differences (P > 0.05). With the increase in the content of heparin-conjugated gelatin, the rhBMP-2 adsorption capacity of the nanofibrous heparin/gelatin scaffold is improved, thereby significantly reducing the burst release of rhBMP-2 and prolonging the releasing time.

Objective To investigate and analyze the residents′knowledge and satisfaction on basic public health services in five districts of Gansu ,to judge the implementation effect of the current policy ,in order to provide the suggestion to improve the effect of the implementation of the policy of basic public health services .Methods Based on typical sampling method ,1 688 rural and urban residents had been investigated coming from five counties in Gansu by using questionnaires to survey .Results The de‐gree of residents′knowledge about the policy was low (57 .23% );the residents could know about the policy through a variety of ways ,and mainly for medical staff to promote by approaching their homes ;91 .94% of surveyed residents thought that policy service was more convenient when they were accepting ;90 .99% of surveyed residents thought that they satisfied with the service attitude of staff ;82 .35% of surveyed residents believed that the policy service effects was obvious ;90 .11% of surveyed residents overall satisfied with the service of policy .The above results were different in proportion in various counties(P<0 .05) .Conclusion The degree of residents′knowledge and satisfaction on basic public health services in five districts of Gansu still needs to be improved .

Objective To investigate the application value of tuberculosis infection of T cells spot test in the diagnosis for pulmonary tuberculosis in elderly patients with chronic obstructive pulmonary disease(COPD).Methods According to test different ways,64 elderly COPD patients with pulmonary tuberculosis were divided into the two groups.The control group(n =32)was checked by tuberculosis antibody test,and the study group(n =32)received T cells infected with tuberculosis spot test.The two sets of results were observed and compared.Results The study group by T cell spot test TB infection,29 cases were detected positive(90.63%),3 cases of negative(9.37%);tuberculosis antibody detection by the control group,23 cases were detected positive(71.88%),9 negative patients (28.12%).Compared the two groups,the study group had higher positive rate(χ2 =3.954 7,P <0.05),and nega-tive rate was lower(χ2 =3.914 7,P <0.05).Conclusion Tuberculosis infection T cell spot test in the diagnosis of pulmonary tuberculosis in patients with COPD in the elderly has greater value,more accurate diagnosis,reliability and worthy of promotion.

Airway obstruction in children is a rare,in recent years,with the development of CT technology and the development of fiber bronchoscopy,the number of cases of children with tracheal stenosis has increased year by year,but difficult clinical problem,with no clear agreement on optimal therapeutic approach.Stenting of the airway has been used successfully in adults,and is an attractive alternative in children.Fundamental differences of pediatric compared to adult use include the benign nature of most stenoses,the narrow and soft airways of children,the required long-term tolerance and adaptation to growth.So it is controversial in the indications.

Objective To analyze the correlation between students' scores and master degree of knowledge points in the close examination of the unit introduction of nursing. Methods A classification decision tree model was used to analyze the relationship between students' achievement and knowledge points in 321 grade 2014 nursing students. Results There were 20 knowledge points in the paper, 7 of which had significant influence on scores; there were 27 nodes,16 of which were leaf nodes; the overall predicted percentage was 86.0%. Conclusions The total score is related to knowledge score; the total score of gifted students is higher;and for total score of medium students is medium;and for total score of poor is lower. Measures to reform teaching methods and evaluation scheme should be taken.

Objective To understand the protective effects of children after hepatitis B vaccine immunization since 1992,when the hepatitis B vaccine into childhood immunization strategy .Methods Hospitalized children from venous blood,using enzyme-linked immunosorbent assay(ELISA),to investigate and analyze the immune status based hepatitis B immune of hospitalized children (Infection,Pediatric),by five indicators of hepatitis B as the judgment standard.Results The total anti-HBs-positive rate was 55.05%,including infection anti-HBs-positive rate 52.18%, the pediatric anti-HBs-positive rate 55.92%.Male anti-HBs positive rate was 54.17%,the female anti-HBs positive rate was 56.6%,there was no statistical significance among departments and sexs (P>0.05).Conclusion Hepatitis B vaccination is the effective control means for hepatitis B ,however,the anti-HBs positive rate is low in this region after hepatitis B vaccine immunization ,needed to reseed .

Acupuncture Therapy ; Aged ; Female ; Humans ; Middle Aged ; Olfaction Disorders ; etiology ; physiopathology ; therapy ; Sinusitis ; complications ; Smell

OJECTIVE：To explore whether EGb761 could protect against doxorubicin-induced cardiotoxicity, and whether it affects on doxorubicin antitumor activity. METHOD： Doxorubicin-induced rat heart mitochondria damage in vitro and doxorubicin-induced cardiotoxicity in mice were used. The cardiotoxicity were evaluated via spectrophotography, electromicrography and other methods.RESULTS： Doxorubicin markedly induced malondialdehyde formation, adenosine 5′-triphosphatase activity loss, membrane rigidification, swelling, disintegration and lysis of rat heart mitochondria in vitro, all the above pathological and biochemical damages were reduced significantly by EGb761. Cardiotoxicity of doxorubicin in mice as measured by increases of heart Malondialdehyde level and serum creatine phosphokinase activity was significantly alleviated by EGb761. Moreover. The antitumor activity of doxorubicin, as assayed by prolonged life span of mice bearing with H22 hepatoma, was not reduced by EGb761 treatment. CONCLUSION：Ginkgo biloba extract may protect heart against doxorubicin-induced cardiotoxicity without interfering with its antitumor activity in mice.

Objective: To explore the function of network information in the medical research teaching. Methods: To analyze the function of network information in the medical research, combined with the current actual medical research teaching, to understand correctly the related problems, and find the corresponding appropriate solutions. Results: In medical research teaching, the students should be led to use correctly the network tool for keeping track the research forefront, solving scientific problems, broadening the research mindset; avoiding addiction, split personality and internet plagiarism. Conclusion:In the medical research teaching, the students should be guided to use the network tools correctly, which maximize its effect.

Objective:To discuss a simple method for flow cytometric analysis of cell DNA stained with DAPI and Hoechst33342.Methods:HT 29 cells stained with DAPI,Hoechst33342 or PI were measured by BD FACSAria and the percentages of cells in G0/G1,S and G2/M phases with three staining me-thods,then the results were analyzed and compared.Before measurement we monitored the quality of DNA analysis of flow cytometer through UV beads QC experiment and analyzed the standard chicken erythrocyte nuclei(CEN) and calf thymocyte nuclei(CTN) stained with DAPI and Hoechst33342.Results:CV value of UV peak was 2.4 after QC experiments.There were 4 peaks on CEN histograms and the ratios of peak channel mean of G2/G1,G3/G1,and G4/G1 were about 2,3,and 4 respectively.Both CV values of the first peak were 2.4.There were 2 peaks on CTN histograms and the ratio of peak channel mean of G2/G1 was 1.97,and CV value of G0/G1 2.4.The complete cell cycle of HT29 cells stained with DAPI,Hoechst33342 or PI was showed entirely,CV values were 3.40,3.02 and 4.42,respectively,and the percentages of cells in G0/G1 were 60.86%,60.22% and 60.81%,respectively,in S,28.85%,29.70% and 29.82%,respectively,and in G2/M,10.29%,9.09% and 9.37%,respectively.The results by the three methods showed no difference.Conclusion:This method for measurement of cellular DNA content is a simple and efficient approach to determining cell cycle and can be the first choice when using flow cytometer with 355 nm UV.