To investigate the feasibility of implanting the biocomposite of calcium phosphate cement(CPC)/polylactic acid-polyglycolic acid(PLGA) into animals for bone defects repairing,the biocomposite of CPC/PLGA was prepared ...To investigate the feasibility of implanting the biocomposite of calcium phosphate cement(CPC)/polylactic acid-polyglycolic acid(PLGA) into animals for bone defects repairing,the biocomposite of CPC/PLGA was prepared and its setting time,compressive strength,elastic modulus,pH values,phase composition of the samples,degradability and biocompatibility in vitro were tested.The above-mentioned composite implanted with bone marrow stromal cells was used to repair defects of the radius in rabbits.Osteogenesis was histomorphologically observed by using an electron-microscope.The results show that compared with the CPC,the physical and chemical properties of CPC/PLGA composite have some differences in which CPC/PLGA composite has better biological properties.The CPC/PLGA composite combined with seed cells is superior to the control in terms of the amount of new bones formed after CPC/PLGA composite is implanted into the rabbits,as well as the speed of repairing bone defects.The results suggest that the constructed CPC/PLGA composite basically meets the requirements of tissue engineering scaffold materials and that the CPC/PLGA composite implanted with bone marrow stromal cells may be a new artificial bone material for repairing bone defects because it can promote the growth of bone tissues.展开更多
Technology was developed for obtaining ecologically pure composites containing nitrogenous fertilizers of prolonged action and nitrogen-fixing microorganisms in order to increase productivity of cereal crops. As a res...Technology was developed for obtaining ecologically pure composites containing nitrogenous fertilizers of prolonged action and nitrogen-fixing microorganisms in order to increase productivity of cereal crops. As a result of application of this composite nitrogenous fertilizer hectare norm decreases by 40%-55%, while productivity increases by 15%-30%, compared to those of the control.展开更多
High-efficiency photocatalysts are of great importance to satisfy the requirements of green chemistry nowadays.Here we reported a novel solar-driven photocatalyst fabricated by a facile surface modification method,wit...High-efficiency photocatalysts are of great importance to satisfy the requirements of green chemistry nowadays.Here we reported a novel solar-driven photocatalyst fabricated by a facile surface modification method,with the two-dimensional carboxylated zinc phthalocyanine-carboxylated C60-titanium dioxide(Zn Pc-C3-Ti O2)nanosheets,in which the surface modifications of Zn Pc and C60derivative were designed to extend the absorption range and promote charge separation,respectively.Benefiting from the unique structure and positive synergetic effect,the Zn Pc-C3-Ti O2 nanocomposite shows promising applications in selective reduction of nitroarenes for high-value-added aromatic amines under solar light.Especially,for the photocatalytic reduction of nitrobenzene to aniline,the Zn Pc-C3-Ti O2 nanocomposite possesses both high efficiency and selectivity(up to 99%).展开更多
基金Projects(30370412, 30670558) supported by the National Natural Science Foundation of China
文摘To investigate the feasibility of implanting the biocomposite of calcium phosphate cement(CPC)/polylactic acid-polyglycolic acid(PLGA) into animals for bone defects repairing,the biocomposite of CPC/PLGA was prepared and its setting time,compressive strength,elastic modulus,pH values,phase composition of the samples,degradability and biocompatibility in vitro were tested.The above-mentioned composite implanted with bone marrow stromal cells was used to repair defects of the radius in rabbits.Osteogenesis was histomorphologically observed by using an electron-microscope.The results show that compared with the CPC,the physical and chemical properties of CPC/PLGA composite have some differences in which CPC/PLGA composite has better biological properties.The CPC/PLGA composite combined with seed cells is superior to the control in terms of the amount of new bones formed after CPC/PLGA composite is implanted into the rabbits,as well as the speed of repairing bone defects.The results suggest that the constructed CPC/PLGA composite basically meets the requirements of tissue engineering scaffold materials and that the CPC/PLGA composite implanted with bone marrow stromal cells may be a new artificial bone material for repairing bone defects because it can promote the growth of bone tissues.
文摘Technology was developed for obtaining ecologically pure composites containing nitrogenous fertilizers of prolonged action and nitrogen-fixing microorganisms in order to increase productivity of cereal crops. As a result of application of this composite nitrogenous fertilizer hectare norm decreases by 40%-55%, while productivity increases by 15%-30%, compared to those of the control.
基金supported by Beijing Natural Science Foundation(2182094)the National Natural Science Foundation of China(51772300 and 51832008)the Youth Innovation Promotion Association of CAS(2018039)。
文摘High-efficiency photocatalysts are of great importance to satisfy the requirements of green chemistry nowadays.Here we reported a novel solar-driven photocatalyst fabricated by a facile surface modification method,with the two-dimensional carboxylated zinc phthalocyanine-carboxylated C60-titanium dioxide(Zn Pc-C3-Ti O2)nanosheets,in which the surface modifications of Zn Pc and C60derivative were designed to extend the absorption range and promote charge separation,respectively.Benefiting from the unique structure and positive synergetic effect,the Zn Pc-C3-Ti O2 nanocomposite shows promising applications in selective reduction of nitroarenes for high-value-added aromatic amines under solar light.Especially,for the photocatalytic reduction of nitrobenzene to aniline,the Zn Pc-C3-Ti O2 nanocomposite possesses both high efficiency and selectivity(up to 99%).
