采用枸杞原浆作为添加到酸奶中的功能成分,探索枸杞酸奶的抗氧化活性和保肝功能。在体外抗氧化活性实验中,采用了铁氰化钾法、1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)法和水杨酸法。结果表明在枸杞原浆添加一定...采用枸杞原浆作为添加到酸奶中的功能成分,探索枸杞酸奶的抗氧化活性和保肝功能。在体外抗氧化活性实验中,采用了铁氰化钾法、1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)法和水杨酸法。结果表明在枸杞原浆添加一定体积分数范围内,枸杞酸奶总抗氧化还原能力、DPPH自由基清除率和羟自由基清除率均随枸杞原浆添加体积分数的增加而增加。通过急性酒精性肝损伤动物模型评价了枸杞酸奶的益生功能,结果显示枸杞酸奶可以降低小鼠血清中谷丙转氨酶(Cereal third transaminase,ALT)活性和肝脏中脂多糖(Lipopolysaccharide,LPS)含量,提高肝脏中谷胱甘肽(Glutathione,GSH)质量摩尔浓度和总抗氧化能力(Total antioxidant capacity,T-AOC),表明枸杞酸奶对乙醇引起的小鼠急性酒精性肝损伤具有一定辅助保护作用。综上所述,枸杞酸奶表现出较强的抗氧化活性和保肝功能,为日后研发具有解酒保肝功能特性的枸杞发酵乳制品提供了一定的数据支撑和理论依据。展开更多
The behaviour of optical interface phonon is investigated first for the graded quantum well of Ga_(l-x)Al_(x)As in the dielectric continuum model.It is found that the behaviour of interface phonon modes is quite diffe...The behaviour of optical interface phonon is investigated first for the graded quantum well of Ga_(l-x)Al_(x)As in the dielectric continuum model.It is found that the behaviour of interface phonon modes is quite different from that in square quantum well structure.The dispersions of the interface modes are sensitive to the gradient of the graded quantum well structure,and the symmetry of modes can be changed greatly,which is important for phonon-related phenomena.展开更多
Using the first-principle self-consistent linear-muffin-tin-orbital method within the local density approximation,band structure of(111)-oriented strained-layer SiGe superlattice is studied.Three different ordered arr...Using the first-principle self-consistent linear-muffin-tin-orbital method within the local density approximation,band structure of(111)-oriented strained-layer SiGe superlattice is studied.Three different ordered arrangements of atom layers(Si-Ge■Si-Ge Si-Si■Ge-Ge and Si■Si-Ge■Ge)are considered.Calculated results indicate that(111)-oriented SiGe strained layer superlattices are semiconductive,with a band gap about 1.OeV.The first two superlattices are indirect band gap semiconductors,and the third one(Si■Si-Ge■Ge)is a direct band gap semiconductor.The influence of strain on the band structure is also investigated.展开更多
文摘采用枸杞原浆作为添加到酸奶中的功能成分,探索枸杞酸奶的抗氧化活性和保肝功能。在体外抗氧化活性实验中,采用了铁氰化钾法、1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)法和水杨酸法。结果表明在枸杞原浆添加一定体积分数范围内,枸杞酸奶总抗氧化还原能力、DPPH自由基清除率和羟自由基清除率均随枸杞原浆添加体积分数的增加而增加。通过急性酒精性肝损伤动物模型评价了枸杞酸奶的益生功能,结果显示枸杞酸奶可以降低小鼠血清中谷丙转氨酶(Cereal third transaminase,ALT)活性和肝脏中脂多糖(Lipopolysaccharide,LPS)含量,提高肝脏中谷胱甘肽(Glutathione,GSH)质量摩尔浓度和总抗氧化能力(Total antioxidant capacity,T-AOC),表明枸杞酸奶对乙醇引起的小鼠急性酒精性肝损伤具有一定辅助保护作用。综上所述,枸杞酸奶表现出较强的抗氧化活性和保肝功能,为日后研发具有解酒保肝功能特性的枸杞发酵乳制品提供了一定的数据支撑和理论依据。
文摘The behaviour of optical interface phonon is investigated first for the graded quantum well of Ga_(l-x)Al_(x)As in the dielectric continuum model.It is found that the behaviour of interface phonon modes is quite different from that in square quantum well structure.The dispersions of the interface modes are sensitive to the gradient of the graded quantum well structure,and the symmetry of modes can be changed greatly,which is important for phonon-related phenomena.
文摘Using the first-principle self-consistent linear-muffin-tin-orbital method within the local density approximation,band structure of(111)-oriented strained-layer SiGe superlattice is studied.Three different ordered arrangements of atom layers(Si-Ge■Si-Ge Si-Si■Ge-Ge and Si■Si-Ge■Ge)are considered.Calculated results indicate that(111)-oriented SiGe strained layer superlattices are semiconductive,with a band gap about 1.OeV.The first two superlattices are indirect band gap semiconductors,and the third one(Si■Si-Ge■Ge)is a direct band gap semiconductor.The influence of strain on the band structure is also investigated.
