The binary and ternary rare earth terbium(Ⅲ) complexes were introduced into the styrene/ α methylacrylic acid copolymerization system, and some optical resins that possess a high transparency in visible light region...The binary and ternary rare earth terbium(Ⅲ) complexes were introduced into the styrene/ α methylacrylic acid copolymerization system, and some optical resins that possess a high transparency in visible light region were obtained. The study of the optical property showed that they have good luminescent properties such as a high luminous intensity and a long luminous lifetime. In addition, we investigated the relationship among the transparency, the luminescent property of the copolymer, and the content of the components in the polymeric system. The results indicated that the optical resins can provide a relatively stable environment for composite rare earth complexes, which is good to exhibit the luminescent properties of rare earth complexes. At the same time, the rare earth complexes can offer the transparent resin a novel function.展开更多
The abzyme with deiodinase activity was modified with diethyl pyrocarbonate(DEPC) and carbodiimide(EDC) respectively. The modified abzymes were dialyzed and their activities were compared with that of the native abzym...The abzyme with deiodinase activity was modified with diethyl pyrocarbonate(DEPC) and carbodiimide(EDC) respectively. The modified abzymes were dialyzed and their activities were compared with that of the native abzyme. The results indicate that the histidine residue is one of the essential groups in the abzyme, and the modification causes the catalytic activity a loss of 70%. The modification of the residues containing carboxyl group with EDC leads to a loss of 50% activity, indicating that acid amino residues play important roles in the catalytic reaction.展开更多
The stability constants of ternary complexes of Gd(Ⅲ) with citric( L aspartic) acid and L serine( L threonine) under the synthetic biological conditions of temperature and background electrolyte (37 ℃, 0.15 mol/L Na...The stability constants of ternary complexes of Gd(Ⅲ) with citric( L aspartic) acid and L serine( L threonine) under the synthetic biological conditions of temperature and background electrolyte (37 ℃, 0.15 mol/L NaCl) were obtained by potentiometric titration. The distributions of Gd(Ⅲ) species in these systems have been discussed.展开更多
The extraction mechanism of rare earth elements from chloride medium with sec octylphenoxy acetic acid(CA 12) in n heptane has been studied. The results showed that CA 12 could be applied to separation of Y from light...The extraction mechanism of rare earth elements from chloride medium with sec octylphenoxy acetic acid(CA 12) in n heptane has been studied. The results showed that CA 12 could be applied to separation of Y from light rare earth mixture. The structures of the extracted complexes were deduced based on the IR measurements.展开更多
文摘The binary and ternary rare earth terbium(Ⅲ) complexes were introduced into the styrene/ α methylacrylic acid copolymerization system, and some optical resins that possess a high transparency in visible light region were obtained. The study of the optical property showed that they have good luminescent properties such as a high luminous intensity and a long luminous lifetime. In addition, we investigated the relationship among the transparency, the luminescent property of the copolymer, and the content of the components in the polymeric system. The results indicated that the optical resins can provide a relatively stable environment for composite rare earth complexes, which is good to exhibit the luminescent properties of rare earth complexes. At the same time, the rare earth complexes can offer the transparent resin a novel function.
文摘The abzyme with deiodinase activity was modified with diethyl pyrocarbonate(DEPC) and carbodiimide(EDC) respectively. The modified abzymes were dialyzed and their activities were compared with that of the native abzyme. The results indicate that the histidine residue is one of the essential groups in the abzyme, and the modification causes the catalytic activity a loss of 70%. The modification of the residues containing carboxyl group with EDC leads to a loss of 50% activity, indicating that acid amino residues play important roles in the catalytic reaction.
文摘The stability constants of ternary complexes of Gd(Ⅲ) with citric( L aspartic) acid and L serine( L threonine) under the synthetic biological conditions of temperature and background electrolyte (37 ℃, 0.15 mol/L NaCl) were obtained by potentiometric titration. The distributions of Gd(Ⅲ) species in these systems have been discussed.
文摘The extraction mechanism of rare earth elements from chloride medium with sec octylphenoxy acetic acid(CA 12) in n heptane has been studied. The results showed that CA 12 could be applied to separation of Y from light rare earth mixture. The structures of the extracted complexes were deduced based on the IR measurements.
