Synchrotron radiation X-ray fluorescence （SR-XRF） approach was applied to analyzing of Chinstrap penguin （ Pygoscelis Antarctica） cortical bone. The method enabled the in situ determination of Ca and P concentrati...Synchrotron radiation X-ray fluorescence （SR-XRF） approach was applied to analyzing of Chinstrap penguin （ Pygoscelis Antarctica） cortical bone. The method enabled the in situ determination of Ca and P concentrations and the Ca/P ratio in cortical bone. The preliminary results show that ： （ 1 ） there is the bone site-related difference for Ca and P concentrations. The mean values for the investigated parameters （ on a dry-weight basis） are： 30.7% （Ca） and 14.9% （P） for the femoral cortical bone, 21.4% （Ca） and 11.5% （P） for wing cortical bone. （2） The variation for the Ca/P ratio in cortical bone is lower than those for Ca and P separately. This is in agreement with the previous report that the specificity of the Ca/P ratio is better than that of Ca and P concentrations and is more reliable for the diagnosis of bone disorders. The authors suggest that further studies be conducted to establish norreal values of Ca, P and Ca/P ratio for polar animals and provide a basis for the diagnosis of bone disorders.展开更多
采用分步沉积法制备不同Sr/Ti摩尔比例的Sr/Ti O2催化剂,以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外(FT-IR)光谱、紫外-可见漫反射光谱(UV-Vis RDS)等手段对样品进行了表征,以可见光催化降解亚甲基蓝为模型反应...采用分步沉积法制备不同Sr/Ti摩尔比例的Sr/Ti O2催化剂,以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外(FT-IR)光谱、紫外-可见漫反射光谱(UV-Vis RDS)等手段对样品进行了表征,以可见光催化降解亚甲基蓝为模型反应考察样品光催化活性.结果表明,催化剂的活性和结构随Sr/Ti摩尔比(n(Sr)/n(Ti))的变化而变化,当n(Sr)/n(Ti)≤3/2时,催化剂呈由Ti O2和Sr Ti O3组成的球状结构;而当n(Sr)/n(Ti)在3/2与4/1之间时,催化剂呈片状结构,且随着n(Sr)/n(Ti)增大,催化剂组成由Sr Ti O3和Sr2Ti O4变为Sr2Ti O4和Sr(OH)2H2O;当n(Sr)/n(Ti)=9/1时,催化剂呈以Sr(OH)2H2O为主的针状结构.其中,n(Sr)/n(Ti)=4/1的样品表现出最高的光催化活性,一级反应速率为Sr Ti O3钙钛矿催化剂的5.0倍,商用P25的86.7倍.展开更多
基金grants from the National Natural Science Foundation of China(Project No.40306001) the Foundation for the Author of National Excellent Doctoral Dissertation of P.R.China(Grant No.200354)from Ministry of Education of China and Chinese Academy of Sciences.It was partially support by BSRF(Project No.SR-03097).
文摘Synchrotron radiation X-ray fluorescence （SR-XRF） approach was applied to analyzing of Chinstrap penguin （ Pygoscelis Antarctica） cortical bone. The method enabled the in situ determination of Ca and P concentrations and the Ca/P ratio in cortical bone. The preliminary results show that ： （ 1 ） there is the bone site-related difference for Ca and P concentrations. The mean values for the investigated parameters （ on a dry-weight basis） are： 30.7% （Ca） and 14.9% （P） for the femoral cortical bone, 21.4% （Ca） and 11.5% （P） for wing cortical bone. （2） The variation for the Ca/P ratio in cortical bone is lower than those for Ca and P separately. This is in agreement with the previous report that the specificity of the Ca/P ratio is better than that of Ca and P concentrations and is more reliable for the diagnosis of bone disorders. The authors suggest that further studies be conducted to establish norreal values of Ca, P and Ca/P ratio for polar animals and provide a basis for the diagnosis of bone disorders.
文摘采用分步沉积法制备不同Sr/Ti摩尔比例的Sr/Ti O2催化剂,以X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、傅里叶变换红外(FT-IR)光谱、紫外-可见漫反射光谱(UV-Vis RDS)等手段对样品进行了表征,以可见光催化降解亚甲基蓝为模型反应考察样品光催化活性.结果表明,催化剂的活性和结构随Sr/Ti摩尔比(n(Sr)/n(Ti))的变化而变化,当n(Sr)/n(Ti)≤3/2时,催化剂呈由Ti O2和Sr Ti O3组成的球状结构;而当n(Sr)/n(Ti)在3/2与4/1之间时,催化剂呈片状结构,且随着n(Sr)/n(Ti)增大,催化剂组成由Sr Ti O3和Sr2Ti O4变为Sr2Ti O4和Sr(OH)2H2O;当n(Sr)/n(Ti)=9/1时,催化剂呈以Sr(OH)2H2O为主的针状结构.其中,n(Sr)/n(Ti)=4/1的样品表现出最高的光催化活性,一级反应速率为Sr Ti O3钙钛矿催化剂的5.0倍,商用P25的86.7倍.
