Poly（3-hydroxybutyrate-co-3-hydroxyhexanoate） （PHBHHx） scaffolds were prepared by thermally inducing phase separation （TIPS） for bone reconstruction. Scanning electron microscopy and porosity measurements were u...Poly（3-hydroxybutyrate-co-3-hydroxyhexanoate） （PHBHHx） scaffolds were prepared by thermally inducing phase separation （TIPS） for bone reconstruction. Scanning electron microscopy and porosity measurements were used to analyze the structure and properties of the scaffolds. The pore diameter of the scaffolds could be easily controlled by changing the quenching temperature and time. The biocompatibility was assessed by examining the proliferation and morphology of MC 3T3-E1 osteoprogenitor cells seeded on the scaffolds. Cultures grown in the presence of a source of phosphate ions showed the formation of a mineralized extracellular matrix. The results indicate that PHBHHx scaffolds prepared using TIPS are a promising candidate for bone reconstruction.展开更多
In this paper, we consider the bifurcation for a class of cubic integrable system under cubic perturbation. Using bifurcation theory and qualitative analysis, we obtain a complete bifurcation diagram of the system in ...In this paper, we consider the bifurcation for a class of cubic integrable system under cubic perturbation. Using bifurcation theory and qualitative analysis, we obtain a complete bifurcation diagram of the system in a neighbourhood of the origin for parameter plane.展开更多
基金Supported by the National Key Basic Research and Development (973) Program of China (No. 2005CB623905)the Tsinghua-Yue-Yuen Medical Science Fund
文摘Poly（3-hydroxybutyrate-co-3-hydroxyhexanoate） （PHBHHx） scaffolds were prepared by thermally inducing phase separation （TIPS） for bone reconstruction. Scanning electron microscopy and porosity measurements were used to analyze the structure and properties of the scaffolds. The pore diameter of the scaffolds could be easily controlled by changing the quenching temperature and time. The biocompatibility was assessed by examining the proliferation and morphology of MC 3T3-E1 osteoprogenitor cells seeded on the scaffolds. Cultures grown in the presence of a source of phosphate ions showed the formation of a mineralized extracellular matrix. The results indicate that PHBHHx scaffolds prepared using TIPS are a promising candidate for bone reconstruction.
文摘In this paper, we consider the bifurcation for a class of cubic integrable system under cubic perturbation. Using bifurcation theory and qualitative analysis, we obtain a complete bifurcation diagram of the system in a neighbourhood of the origin for parameter plane.
