The crystal structure of di-hydroxyisobutyrate)diaquo neodymium nitrate Nd(C_4H_7O_3)_2NO_32H_2O was determined by X-ray diffraction analysis. It belongs to monoclinic,space group C2/C,with cell dimensionsa=8.996(1), ...The crystal structure of di-hydroxyisobutyrate)diaquo neodymium nitrate Nd(C_4H_7O_3)_2NO_32H_2O was determined by X-ray diffraction analysis. It belongs to monoclinic,space group C2/C,with cell dimensionsa=8.996(1), b=8.601(1),c=21.111(3),β=92.38°,V=1632.O,Z=4,D_c=1.83g/cm^3.Crystal structure has been refined by full-matrix least-square techniques giving a final R value of 0.036.The neodymium atom is coordinated to eight oxygen atoms.The nitrate group in complex is not bonded to neodymium,each two neodymium atoms are linked by bridging carboxyl group forming a chain polymeric molecule.展开更多
The diameter of the colony of Fusarium oxysporum in solid medium, and the mycelium growth, pectinase activity, and mycelium permeability of Fusarium oxysporum in liquid medium under varying concentrations of Nd^3＋ （...The diameter of the colony of Fusarium oxysporum in solid medium, and the mycelium growth, pectinase activity, and mycelium permeability of Fusarium oxysporum in liquid medium under varying concentrations of Nd^3＋ （0, 2, 4, 10, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 300, and 400 mg·L^-1） were measured. The results indicated that the growth of Fusarium oxysporum was stimulated in solid medium when the concentration of Nd^3＋ ranges from 2 to 180 mg·L^-1, whereas it was inhibited when Nd^3 ＋ concentration was greater than 200 mg· L^-1. The colonies were fewer and smaller when Nd^3 ＋ was used in the solid medium. The growth of Fusarium oxysporum was inhibited in liquid medium when Nd^3＋ was used. The inhibition rate showed by the dry weight of mycelium ranged from 4.83% to 52.18% and inereased with Nd^3 ＋ concentration. The pectinase activity decreased compared with that of controls. When the concentration of Nd^3 ＋ was 10 and 400 mg· L^- 1, the pectinase activity decreased by 95 % at both concentrations. Mycelium cell membrane permeability increased when Nd^3 ＋ concentrations ranged from 10 to 400 mg· L^-1 but decreased when Nd^3＋ concentration was 2 mg· L^-1.展开更多
Euglena gracilis 277, a unicellular green alga, demonstrated remarkable ability to transport Nd3+ to the cell compartments. For a given amount of Nd3+ and cells, the results of ICP-AES indicated that the cellular upta...Euglena gracilis 277, a unicellular green alga, demonstrated remarkable ability to transport Nd3+ to the cell compartments. For a given amount of Nd3+ and cells, the results of ICP-AES indicated that the cellular uptake of Nd3+ was independent of Nd3+ concentration in thebulk solution. The average uptake of Nd3+ per celi (mMd) is proportional to a parameter ξ-theratio of neodymium content to the celi counts of the system. A novel approach for probing cellular neodymium by tetraiodotetra chlorofluorescein (I4TCF) has been devised. Data derived from the cryosections of !4TCF-Nd3+ stained cells and EDAX of the fast freezing ultrathin cryosections indicate that Nd3+ is distributed over the celi compartments. Chloroplasts are the major compartments as the residence of Nd3+ in the alga. The transport should be against a concentration gradient of Nd3+ on the order of five, even higher. it is proposed that a calcium ion channel would play an important role in the Nd3+ transportation.展开更多
文摘The crystal structure of di-hydroxyisobutyrate)diaquo neodymium nitrate Nd(C_4H_7O_3)_2NO_32H_2O was determined by X-ray diffraction analysis. It belongs to monoclinic,space group C2/C,with cell dimensionsa=8.996(1), b=8.601(1),c=21.111(3),β=92.38°,V=1632.O,Z=4,D_c=1.83g/cm^3.Crystal structure has been refined by full-matrix least-square techniques giving a final R value of 0.036.The neodymium atom is coordinated to eight oxygen atoms.The nitrate group in complex is not bonded to neodymium,each two neodymium atoms are linked by bridging carboxyl group forming a chain polymeric molecule.
基金Project supported by the High Technology Research and Development Programof China (2002AA244031) China Postdoctoral Science Foundation and Young Foundation of Shandong Academy of Agricultural Science
文摘The diameter of the colony of Fusarium oxysporum in solid medium, and the mycelium growth, pectinase activity, and mycelium permeability of Fusarium oxysporum in liquid medium under varying concentrations of Nd^3＋ （0, 2, 4, 10, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 300, and 400 mg·L^-1） were measured. The results indicated that the growth of Fusarium oxysporum was stimulated in solid medium when the concentration of Nd^3＋ ranges from 2 to 180 mg·L^-1, whereas it was inhibited when Nd^3 ＋ concentration was greater than 200 mg· L^-1. The colonies were fewer and smaller when Nd^3 ＋ was used in the solid medium. The growth of Fusarium oxysporum was inhibited in liquid medium when Nd^3＋ was used. The inhibition rate showed by the dry weight of mycelium ranged from 4.83% to 52.18% and inereased with Nd^3 ＋ concentration. The pectinase activity decreased compared with that of controls. When the concentration of Nd^3 ＋ was 10 and 400 mg· L^- 1, the pectinase activity decreased by 95 % at both concentrations. Mycelium cell membrane permeability increased when Nd^3 ＋ concentrations ranged from 10 to 400 mg· L^-1 but decreased when Nd^3＋ concentration was 2 mg· L^-1.
文摘Euglena gracilis 277, a unicellular green alga, demonstrated remarkable ability to transport Nd3+ to the cell compartments. For a given amount of Nd3+ and cells, the results of ICP-AES indicated that the cellular uptake of Nd3+ was independent of Nd3+ concentration in thebulk solution. The average uptake of Nd3+ per celi (mMd) is proportional to a parameter ξ-theratio of neodymium content to the celi counts of the system. A novel approach for probing cellular neodymium by tetraiodotetra chlorofluorescein (I4TCF) has been devised. Data derived from the cryosections of !4TCF-Nd3+ stained cells and EDAX of the fast freezing ultrathin cryosections indicate that Nd3+ is distributed over the celi compartments. Chloroplasts are the major compartments as the residence of Nd3+ in the alga. The transport should be against a concentration gradient of Nd3+ on the order of five, even higher. it is proposed that a calcium ion channel would play an important role in the Nd3+ transportation.
基金the support of National Natural Science Foundation of China (No.21101037 and 21272045)the Natural Science Foundation of the Department of Education of Guizhou Province
