Structure and magnetostriction of Dy1-Pr_x Fe_2 (0≤x≤0.5), Dy_0.6Pr_0.4(Fe_1-_yT_y)_2 (0≤y≤0.6), and Tb_1-z Pr_z(Fe_0.4Co_0.6)_2 (0≤z≤1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of...Structure and magnetostriction of Dy1-Pr_x Fe_2 (0≤x≤0.5), Dy_0.6Pr_0.4(Fe_1-_yT_y)_2 (0≤y≤0.6), and Tb_1-z Pr_z(Fe_0.4Co_0.6)_2 (0≤z≤1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy_1-xPr_xFe_2 is a single phase (Dy, Pr)Fe_2 with MgCu_2-type structure and the second phase is (Dy, Pr)Fe_3 when x≤0.2. The amount of (Dy, Pr)Fe_3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1_-x.Pr_xFe_2 is found to be the (Dy, Pr)_2Fe_17 phase with Th_2Zn_17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)_2 in the Dy_0.6Pr_0.4(Fe_l-Co_y)2 increases with increasing Co concentration when 0≤y≤0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)_2 in (Dy_1-xPr_x)Fe_2. The matrix of (Tb_1-z Pr_z)(Fe_0.4Co_0.6)_2 is a (Tb, Pr)(Fe, Co)_2 phase with the MgC_u2-type cubic Laves structure and a second phase of small amount is (Tb. Pr)(Fe, Co)_3 phase when z≤O.2, z=0.5 and 1.0. When 0.2<z≤0.4, the amount of the (Tb, Pr)(Fe, Co)_3 phase with PuNi_3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z≤0.6 the amount of the (Tb, Pr)(Fe, Co)_3 phase increases sharply, whereas for 0.6<z≤0.8 it decreases with increasing z. The polycrystalline magnetostriction, λ｜｜ - λ｜. at room temperature of Dy_l-xPr_xFe_2 exhibits a peak when x=0.3. The λ｜｜ - λ｜ for Dy_0.6Pr_0.4(Fe_1-y.M_y)_2 (M=Co, Ni) and Tb_l-zPrz(Fe_0.4Co_0.6)_2 is also examined.展开更多
The mimetic peroxidase iron-tetrakis(3-N-methylpyridyl)- porphyrin (Fe-T(3MPy)P)can be used as a catalyst in the spectrophoto- metric determination of H_2O_2 and glucose.The method is based on the formation of crystal...The mimetic peroxidase iron-tetrakis(3-N-methylpyridyl)- porphyrin (Fe-T(3MPy)P)can be used as a catalyst in the spectrophoto- metric determination of H_2O_2 and glucose.The method is based on the formation of crystal violet from leuco crystal violet.The glucose in human serum is determined by this reaction combined with catalytic reaction of glucose oxidase.展开更多
报道了中国希瓦氏菌D14 T 的Fe(Ⅲ)还原特性,研究了溶氧浓度、光照强度、温度、pH等条件对菌株Fe(Ⅲ)还原的影响。结果发现,随着培养基中Fe(Ⅲ)浓度的提高,菌株D14 T 的Fe(Ⅲ)还原速率相应降低;氧气和光照对Fe(Ⅲ)还原有一定的抑制作用...报道了中国希瓦氏菌D14 T 的Fe(Ⅲ)还原特性,研究了溶氧浓度、光照强度、温度、pH等条件对菌株Fe(Ⅲ)还原的影响。结果发现,随着培养基中Fe(Ⅲ)浓度的提高,菌株D14 T 的Fe(Ⅲ)还原速率相应降低;氧气和光照对Fe(Ⅲ)还原有一定的抑制作用;菌株还原Fe(Ⅲ)的最适反应温度为37℃;在反应起始pH6 0 - 10 0的条件下菌株可进行Fe(Ⅲ)还原。对不同形态Fe(Ⅲ)还原特性的研究结果表明,Fe(Ⅲ)的溶解度越高越有利于还原反应的进行。采用SDS和OGP这两种蛋白变性剂对Fe(Ⅲ)还原蛋白进行初步定位的结果表明,参与Fe(Ⅲ)还原的蛋白主要位于细胞可溶性外周蛋白。在同时含有偶氮染料和Fe(Ⅲ)的条件下,菌株D14 T 的偶氮染料脱色率和Fe(Ⅲ)展开更多
基金National Natural Sciences FOundation of China!59725103National Natural Sciences FOundation of China!59871054Science and
文摘Structure and magnetostriction of Dy1-Pr_x Fe_2 (0≤x≤0.5), Dy_0.6Pr_0.4(Fe_1-_yT_y)_2 (0≤y≤0.6), and Tb_1-z Pr_z(Fe_0.4Co_0.6)_2 (0≤z≤1.0) alloys (T=Co, Ni) have been investigated. It is found that the matrix of the alloys Dy_1-xPr_xFe_2 is a single phase (Dy, Pr)Fe_2 with MgCu_2-type structure and the second phase is (Dy, Pr)Fe_3 when x≤0.2. The amount of (Dy, Pr)Fe_3 phase increases with increasing Pr content and becomes the main phase when x=0.4. The matrix of Dy1_-x.Pr_xFe_2 is found to be the (Dy, Pr)_2Fe_17 phase with Th_2Zn_17-type structure when x=0.5. It is found that the amount of the cubic Laves phase (Dy, Pr)(Fe, Co)_2 in the Dy_0.6Pr_0.4(Fe_l-Co_y)2 increases with increasing Co concentration when 0≤y≤0.6. The substitution of Ni for Fe is nearly not favorable for the formation of the cubic Laves phase (Dy, Pr)(Fe, Ni)_2 in (Dy_1-xPr_x)Fe_2. The matrix of (Tb_1-z Pr_z)(Fe_0.4Co_0.6)_2 is a (Tb, Pr)(Fe, Co)_2 phase with the MgC_u2-type cubic Laves structure and a second phase of small amount is (Tb. Pr)(Fe, Co)_3 phase when z≤O.2, z=0.5 and 1.0. When 0.2<z≤0.4, the amount of the (Tb, Pr)(Fe, Co)_3 phase with PuNi_3-type structure increases with increasing z and becomes the main phase when z=0.4. When 0.5<z≤0.6 the amount of the (Tb, Pr)(Fe, Co)_3 phase increases sharply, whereas for 0.6<z≤0.8 it decreases with increasing z. The polycrystalline magnetostriction, λ｜｜ - λ｜. at room temperature of Dy_l-xPr_xFe_2 exhibits a peak when x=0.3. The λ｜｜ - λ｜ for Dy_0.6Pr_0.4(Fe_1-y.M_y)_2 (M=Co, Ni) and Tb_l-zPrz(Fe_0.4Co_0.6)_2 is also examined.
文摘The mimetic peroxidase iron-tetrakis(3-N-methylpyridyl)- porphyrin (Fe-T(3MPy)P)can be used as a catalyst in the spectrophoto- metric determination of H_2O_2 and glucose.The method is based on the formation of crystal violet from leuco crystal violet.The glucose in human serum is determined by this reaction combined with catalytic reaction of glucose oxidase.
文摘报道了中国希瓦氏菌D14 T 的Fe(Ⅲ)还原特性,研究了溶氧浓度、光照强度、温度、pH等条件对菌株Fe(Ⅲ)还原的影响。结果发现,随着培养基中Fe(Ⅲ)浓度的提高,菌株D14 T 的Fe(Ⅲ)还原速率相应降低;氧气和光照对Fe(Ⅲ)还原有一定的抑制作用;菌株还原Fe(Ⅲ)的最适反应温度为37℃;在反应起始pH6 0 - 10 0的条件下菌株可进行Fe(Ⅲ)还原。对不同形态Fe(Ⅲ)还原特性的研究结果表明,Fe(Ⅲ)的溶解度越高越有利于还原反应的进行。采用SDS和OGP这两种蛋白变性剂对Fe(Ⅲ)还原蛋白进行初步定位的结果表明,参与Fe(Ⅲ)还原的蛋白主要位于细胞可溶性外周蛋白。在同时含有偶氮染料和Fe(Ⅲ)的条件下,菌株D14 T 的偶氮染料脱色率和Fe(Ⅲ)
