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
The concentrations of organic carbon （OC） and elemental carbon （EC） in total suspended particle （TSP） were investigated at Ny-Alesund, Svalbard in a two-week campaign. The levels of PC and EC are 0.86±0. 27...The concentrations of organic carbon （OC） and elemental carbon （EC） in total suspended particle （TSP） were investigated at Ny-Alesund, Svalbard in a two-week campaign. The levels of PC and EC are 0.86±0. 27μm^-3 （mean± standard deviation） and 0. 19±0.10 μm^-3 , respectively. Back trajectory analysis of air masses arriving at Ny-Alesund reveals that long-range transport of pol- luted air play insignificant role in PC and EC levels, to which the potential influ- ence of the local contamination were ascribed. The average OC/EC ratio is 5.41, suggesting the presence of the secondary organic aerosols. The estimated secondary organic carbon （SOC） in TSP is 0.59μg/m^3 , accounting for 64% of the total organic carbon.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.
基金supported by grants from the National Natural Science Foundation of China(Project No.40306001)the Foundation for the Author of Nationa1 Excellent Doctoral Dissertation of P.R.China(Grant No.200354)from Ministry of Education of China and Chinese Academy of Sciencessupported by the Chinese Arctic and Antarctic Administration
文摘The concentrations of organic carbon （OC） and elemental carbon （EC） in total suspended particle （TSP） were investigated at Ny-Alesund, Svalbard in a two-week campaign. The levels of PC and EC are 0.86±0. 27μm^-3 （mean± standard deviation） and 0. 19±0.10 μm^-3 , respectively. Back trajectory analysis of air masses arriving at Ny-Alesund reveals that long-range transport of pol- luted air play insignificant role in PC and EC levels, to which the potential influ- ence of the local contamination were ascribed. The average OC/EC ratio is 5.41, suggesting the presence of the secondary organic aerosols. The estimated secondary organic carbon （SOC） in TSP is 0.59μg/m^3 , accounting for 64% of the total organic carbon.
