Electrical properties of triple-doped bismuth oxide electrolyte for solid oxide fuel cells

In this study, the quaternary solid solutions of (Bi2O3)((0.8-x))(Tb4O7)(0.1)(Ho2O3)(0.1)(Dy2O3)(x) (x = 0.05, 0.10, 0.15, 0.20) as an electrolyte were synthesized for solid oxide fuel cells by the technique of solid-state synthesis

THE PROPRIOCEPTION OF THE KNEE JOINT FOLLOWING TIBIA PLATEAU FRACTURES

Proprioception is a conscious and/or unconscious perception of position change in an extremity or joint in space. In our study our purpose was to evaluate whether the lower extremity proprioception in long term, is altered following tibia plateau fractures and to assess its relation with age and type of fracture.This retrospective study includes the evaluation of proprioception in 38 tibia plateau fracture patients (29 male, 9 female) of various types who were operated with open reduction and internal fixation (ORIF) technique in our clinic, by comparison of both operated knee and unaffected knee. The mean age of the patients were 38,8 (range, 20-60) and mean follow-up time was 56 months (range, 13-120 months). Proprioception measurements were assessed at 300 and 600 of knee flexion degrees both passively and actively.There were no significant difference between the operated knee and unaffected knee by mean absolute angular deviation values at passive (p=0,22) or active 600 (p=0,22). Accordingly passive (p=0,47) and active 300 (p=0,62) mean absolute angular deviation values showed no significant difference.Our study has indicated that proprioception at the operated extremity is not significantly different from the unaffected knee in tibia plateau fractures at long term follow-up.

Local application of gingiva-derived mesenchymal stem cells on experimental periodontitis in rats

Background: Stem cell-based approaches in regenerative periodontal therapy have been used in different experimental models. In this study, the effect of local application of gingival mesenchymal stem cells (GMSC) in fibroin/chitosan oligosaccharide lactate hydrogel (F/COS) on periodontal regeneration was evaluated using experimental periodontitis model in rats. Methods: Mesenchymal stem cells were isolated from the gingiva of rats and characterized. Viability tests and confocal imaging of GMSC in hydrogels were performed. Healthy control without periodontitis (Health; H; n=10), control with periodontitis but no application (Periodontitis; P; n=10), only hydrogel application (F/COS; n=10), and GMSC+F/COS (n=10) four groups were formed for in vivo studies. Experimental periodontitis was created with silk sutures around the maxillary second molars. GMSC labeled with green fluorescent protein (GFP) (250,000 cells/50 μL) in F/COS were applied to the defect. Animals were sacrificed at 2nd and 8th weeks and maxillae of the animals were evaluated by micro-computed tomography (micro-CT) and histologically. The presence of GFP-labeled GMSC was confirmed at the end of 8 weeks. Results: Micro-CT analysis showed statistically significant new bone formation in the F/COS+GMSC treated group compared with the P group at the end of 8 weeks (p 0.05). Long junctional epithelium formation was less in the F/COS+GMSC group compared with the P group. Periodontal ligament and connective tissue were well-organized in F/COS+GMSC group. Conclusion: The results showed that local GMSC application in hydrogel contributed to the formation of new periodontal ligament and alveolar bone in rats with experimental periodontitis. Since gingiva is easly accessible tissue, it is promising for autologous cell-based treatments in clinical applications