A vacuum heating operation at 623 K on the surfaces of SiO_2-supported promoted ca- talysts makes it possible to reveal the electron transfer from Co and Fe additives to Rh atoms: a Rh catalyst containing 1 % Eh under...A vacuum heating operation at 623 K on the surfaces of SiO_2-supported promoted ca- talysts makes it possible to reveal the electron transfer from Co and Fe additives to Rh atoms: a Rh catalyst containing 1 % Eh under CO exhibits geminal CO IR bands only, while the presence of Co and Fe in promoted Rh catalysts results in linear and bridged CO chemisorp- tions on Rh in connection with their promotion in the selective hydroformylation of propy- lene.展开更多
Recently,the high incidence of oral mucosal defects and the subsequent functional impairments have attracted widespread attention.Controlling scaffold geometry pattern has been proposed as a strategy to promote cell b...Recently,the high incidence of oral mucosal defects and the subsequent functional impairments have attracted widespread attention.Controlling scaffold geometry pattern has been proposed as a strategy to promote cell behavior and facilitate soft tissue repair.In this study,we innovatively construct an integrated dual-layer heterogeneous polycaprolactone(PCL)scaffold using melt electrowriting(MEW)technology.The outer layer was disordered,while the inner layer featured oriented fiber patterns:parallel(P-par),rhombic(P-rhomb),and square(P-sq).Our findings revealed that the P-rhomb and P-sq scaffolds exhibited superior surface wettability,roughness,and tensile strength compared to the pure disordered PCL scaffolds(P)and P-par.Compared to the commercial collagen membranes,the outer layer of PCL can effectively inhibit bacterial adhesion and biofilm formation.Furthermore,the P-rhomb and P-sq groups demonstrated higher gene and protein expression levels related to cell adhesion and cell migration rates than did the P and P-par groups.Among them,P-sq plays an important role in inducing the differentiation of gingival fibroblasts into myofibroblasts rich inα-smooth muscle actin(α-SMA).Additionally,P-sq could reduce inflammation,promote epithelial regeneration,and accelerate wound healing when used in full-thickness oral mucosal defects in rabbits.Overall,the integrated dual-layer heterogeneous PCL scaffold fabricated by MEW technology effectively inhibited bacterial adhesion and guided tissue regeneration,offering advantages for clinical translation and large-scale production.This promising material holds important potential for treating full-thickness mucosal defects in a bacteria-rich oral environments.展开更多
文摘A vacuum heating operation at 623 K on the surfaces of SiO_2-supported promoted ca- talysts makes it possible to reveal the electron transfer from Co and Fe additives to Rh atoms: a Rh catalyst containing 1 % Eh under CO exhibits geminal CO IR bands only, while the presence of Co and Fe in promoted Rh catalysts results in linear and bridged CO chemisorp- tions on Rh in connection with their promotion in the selective hydroformylation of propy- lene.
基金funded by the Key Research and Development Program of Zhejiang Province(2021C03059 and 2024C03081)the National Natural Science Foundation of China(81801024)the Research and Development Project of Stomatology Hospital Zhejiang University School of Medicine(RD2023JXXK01).
文摘Recently,the high incidence of oral mucosal defects and the subsequent functional impairments have attracted widespread attention.Controlling scaffold geometry pattern has been proposed as a strategy to promote cell behavior and facilitate soft tissue repair.In this study,we innovatively construct an integrated dual-layer heterogeneous polycaprolactone(PCL)scaffold using melt electrowriting(MEW)technology.The outer layer was disordered,while the inner layer featured oriented fiber patterns:parallel(P-par),rhombic(P-rhomb),and square(P-sq).Our findings revealed that the P-rhomb and P-sq scaffolds exhibited superior surface wettability,roughness,and tensile strength compared to the pure disordered PCL scaffolds(P)and P-par.Compared to the commercial collagen membranes,the outer layer of PCL can effectively inhibit bacterial adhesion and biofilm formation.Furthermore,the P-rhomb and P-sq groups demonstrated higher gene and protein expression levels related to cell adhesion and cell migration rates than did the P and P-par groups.Among them,P-sq plays an important role in inducing the differentiation of gingival fibroblasts into myofibroblasts rich inα-smooth muscle actin(α-SMA).Additionally,P-sq could reduce inflammation,promote epithelial regeneration,and accelerate wound healing when used in full-thickness oral mucosal defects in rabbits.Overall,the integrated dual-layer heterogeneous PCL scaffold fabricated by MEW technology effectively inhibited bacterial adhesion and guided tissue regeneration,offering advantages for clinical translation and large-scale production.This promising material holds important potential for treating full-thickness mucosal defects in a bacteria-rich oral environments.
