Porous tantalum-titanium-niobium-zirconium(Ta-Ti-Nb-Zr)bio-high entropy alloy(bioHEA)scaffolds are fabricated using direct ink writing 3D printing technology in this study.A composite ink is prepared using four metal ...Porous tantalum-titanium-niobium-zirconium(Ta-Ti-Nb-Zr)bio-high entropy alloy(bioHEA)scaffolds are fabricated using direct ink writing 3D printing technology in this study.A composite ink is prepared using four metal powders as raw materials:Ta,Ti,Nb and Zr.Ink extrusion is used to build 3D scaf-folds with interconnected porous structures at room temperature,which are then sintered in a vacuum environment.The interdiffusion of metal elements yields porous bioHEA scaffolds with a body-centered cubic(BCC)structure.The fabricated scaffolds have uniform compositions with a significant alloying ef-fect and good biocompatibility.The scaffolds have a compressive strength of 70.08-149.95 MPa and an elastic modulus of 0.18-0.64 GPa,indicating that the mechanical properties can be controlled over a wide range.The scaffolds have a compressive strength close to that of human cortical bone and thus meet the requirements for porous structure characteristics and biological and mechanical properties of orthopedic implants.展开更多
该研究以连续种植温郁金(Curcuma wenyujin Y.H.Chen et C.Ling)的土壤为研究对象,通过高通量测序技术,研究施用不同肥料对温郁金根际微生物群落结构的影响。结果显示:施用生物有机肥能够改善土壤微生物的α多样性,增加Burkholderia-Cab...该研究以连续种植温郁金(Curcuma wenyujin Y.H.Chen et C.Ling)的土壤为研究对象,通过高通量测序技术,研究施用不同肥料对温郁金根际微生物群落结构的影响。结果显示:施用生物有机肥能够改善土壤微生物的α多样性,增加Burkholderia-Caballeronia-Paraburkholderia、不动杆菌属(Acidibacter)等有益菌、功能菌的丰度,降低镰刀菌属(Fusarium)、茎点霉属(Phoma)等病原真菌的丰度。结果表明,生物有机肥可以通过提高土壤有益菌丰度、抑制病原菌富集、改善土壤微生物群落结构,为植物生长提供有利条件,从而减缓连作障碍的发生。展开更多
基金financially supported by the National Natural Science Foundation of China(No.52075421)the Guangdong Ba-sic and Applied Basic Research Foundation(No.2020B1515130002)the Ji Hua Laboratory Project(No.JH-HT20220101).
文摘Porous tantalum-titanium-niobium-zirconium(Ta-Ti-Nb-Zr)bio-high entropy alloy(bioHEA)scaffolds are fabricated using direct ink writing 3D printing technology in this study.A composite ink is prepared using four metal powders as raw materials:Ta,Ti,Nb and Zr.Ink extrusion is used to build 3D scaf-folds with interconnected porous structures at room temperature,which are then sintered in a vacuum environment.The interdiffusion of metal elements yields porous bioHEA scaffolds with a body-centered cubic(BCC)structure.The fabricated scaffolds have uniform compositions with a significant alloying ef-fect and good biocompatibility.The scaffolds have a compressive strength of 70.08-149.95 MPa and an elastic modulus of 0.18-0.64 GPa,indicating that the mechanical properties can be controlled over a wide range.The scaffolds have a compressive strength close to that of human cortical bone and thus meet the requirements for porous structure characteristics and biological and mechanical properties of orthopedic implants.
文摘该研究以连续种植温郁金(Curcuma wenyujin Y.H.Chen et C.Ling)的土壤为研究对象,通过高通量测序技术,研究施用不同肥料对温郁金根际微生物群落结构的影响。结果显示:施用生物有机肥能够改善土壤微生物的α多样性,增加Burkholderia-Caballeronia-Paraburkholderia、不动杆菌属(Acidibacter)等有益菌、功能菌的丰度,降低镰刀菌属(Fusarium)、茎点霉属(Phoma)等病原真菌的丰度。结果表明,生物有机肥可以通过提高土壤有益菌丰度、抑制病原菌富集、改善土壤微生物群落结构,为植物生长提供有利条件,从而减缓连作障碍的发生。
