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Preparation and in vivo investigation of oligomeric proanthocyanidins crosslinked collagen serving as synthesized tissue regeneration membrane
No full textIn this study, type I collagen membranes were prepared using oligomeric proanthocyanidins (OPCs) as the crosslinking agent. The fabricated materials were evaluated to be applied as guided tissue regeneration membranes for periodontal defects. The mechanical strength of the cross-linked collagen membranes, namely OPCs-Col films, using different concentrations of OPCs ranged from 30 to 60 kPa. The cross-linked collagen membranes had better thermal stability than non-cross-linked one and could effectively resist the decomposition in collagenase solution as long as fifty days. The results of material characterization showed that 10% OPCs-Col film was ideal for our purpose. In vitro study using L929 and MG-63 cells revealed that 10% OPCs-Col film had great biocompatibility while OPC was demonstrated to be not cytotoxic as glutaraldehyde and genipin but even promote L929 cells. The material was further studied for in vivo studies with two models, subcutaneous and cranium defects in rat. The subcutaneous test showed that the regeneration membrane degraded till one month and the inflammatory response also reduced with implantation time. When implanted into the cranium defect, no lesions of the brain were caused and new bone tissue was observed inside the material. The results of in vivo studies showed that the synthesized membrane was helpful for tissue regeneration with long degradation time. The tissue regeneration membranes can barrier the rapid growing soft tissue, in order to save the capacity for the growth of neo bone
S10-3 [40] Pioneering Applied Learning University Pathway in the Singapore University Landscape
No full textS3-4 [73] Applying Metacognition Techniques in Improving Communication-based Module Learning Outcomes
No full textS7-4 [42] Pathways, skill sets and learner identities in the post-16 qualifications market: Implications for pedagogical strategies and student engagement in learning in higher education
No full textStructural behaviour of post-installed reinforcement bars in moment connections of wall-slabs
Get PDFPost-installed reinforcement (PIR) bars helps to facilitate retrofitting works, mitigate misplaced reinforcement problems, as well as support newly casted additions. However, the use of PIR has not been addressed in the major reinforced concrete (RC) design codes worldwide. Recently, the European standards have introduced a beneficial coefficient of moments in EN 1992-4 2018 for concrete fastenings which allows compliant PIR systems to be designed by using the bonded anchor (BA) design method. However, when applying this method to wall-slab connection design, the moment resisting capacity is often limited by the lack of bar spacing and small concrete covers. This means that the method neglects long embedment depths and the connections designed based on this method are prone to brittle failure. In this paper, the strut and tie model (STM), which can better describe PIR with long embedment depths, together with the fundamental reinforced concrete (RC) theory is used to improve the ductility of moment connections with PIR bars. An experimental study is conducted to explore the structural behaviour of applying PIR bars that connect the wall and slab. Validations on the proposed STM and supplement to the BA design methods are made. From the experimental findings, measures are then proposed to enhance the ductility of the moment connections
Hydrothermal synthesis of mesoporous Co3O4 nanorods as high capacity anode materials for lithium ion batteries
No full textMesoporous Co3O4 nanorods were successfully fabricated via hydrothermal treatment with presence of diallyldimethylammonium chloride (DDA) as the structure directing agent. The as-prepared Co3O4 exhibited a high degree of crystallization and consisted of nanorods with 0.3~2.4 μm in length and 100~150 nm in diameter. Owing to the unique properties of one dimensional micro-/nano-architecture and mesoporous structure, the as-prepared Co3O4 nanorods exhibited excellent electrochemical lithium storage capability. An initial discharge capacity of 1343.8 mAh g-1 and high capacity retention of 74.7% were achieved at a current density of 500 mAh g-1 for 200 cycles. These outstanding performances of the as-prepared Co3O4 nanorods demonstrated their great potentials in high capacity anode materials for lithium ion batteries