The title compound [Co(en) 2(H 2O) 2] 2· [Mo Ⅴ 4Mo Ⅵ 4V Ⅳ 8O 40 (AsO 4)] was synthesized by hydrothermal method and its structure was determined with single crystal X ray analysis. The cluster anion is a tetra...The title compound [Co(en) 2(H 2O) 2] 2· [Mo Ⅴ 4Mo Ⅵ 4V Ⅳ 8O 40 (AsO 4)] was synthesized by hydrothermal method and its structure was determined with single crystal X ray analysis. The cluster anion is a tetracapped Keggin polyanion, which contains different coordinated cations. The crystal is monoclinic, space group C2/c with a =1.458 3(2) nm, b =2.174 07(13) nm, c =1.893 2(2) nm, β =91.532°, V =6.000 2(10) nm 3, Z =2, D c=1.452 g/cm 3, R =0.035 9, R w=0.079 8, S =1.092.展开更多
Copper(Ⅱ)-ferron(7-iodo-8-hydroxyquinoline-5-sulfonate) one-dimensional coordination polymer Na 2 n [Cu(Ferron) 2] n ·6 n H 2O was synthesized and investigated by X-ray diffraction method. The polymer exhibits a...Copper(Ⅱ)-ferron(7-iodo-8-hydroxyquinoline-5-sulfonate) one-dimensional coordination polymer Na 2 n [Cu(Ferron) 2] n ·6 n H 2O was synthesized and investigated by X-ray diffraction method. The polymer exhibits a linear structure by the bis-iodine-axial coordination to the octahedral Cu(Ⅱ) center,which is stabilized by the iodine-aromatic ring(edge and face) and iodine-iodine interactions between the polymer lines,forming a special layer structure. The complex belongs to a triclinic system,space group P 1, a =0.648 4(19) nm, b =0.654 5(19) nm, c =1.911(6) nm, α=85.42(5)°,β=85.78(5)°,γ=72.99(4)°,V =0.772(4) nm 3 and Z=1 .展开更多
Tetra\{\[4\|carboxymethoxyphenyl\]\}porphyrin copper(Ⅱ), nickel(Ⅱ), zinc(Ⅱ) complex and their dibutyltin(Ⅳ) ester derivatives have been synthesized and characterized. The equilibrium constants of the aggregation o...Tetra\{\[4\|carboxymethoxyphenyl\]\}porphyrin copper(Ⅱ), nickel(Ⅱ), zinc(Ⅱ) complex and their dibutyltin(Ⅳ) ester derivatives have been synthesized and characterized. The equilibrium constants of the aggregation of the metal porphyrin and the equilibrium constant of the π\|π coordination with phenothoroline have been measured by using UV\|Vis titration method. The results show that the equilibrium constants decrease in the order of K \-\{CuP\}> K \-\{NiP\}> K \-\{ZnP\}. The vitro anti\|tumor activities of the dibutyltin(Ⅳ) metal porphyrinate has some relation with the ability of aggregation and coordination with ligand of the metal porphyrin.展开更多
Determining the base sequence of DNA broken site is quite crucial for the study on the cleavage site specificity and mechanism of various natural or synthetic DNA cleavage regents,and on developing novel therapeutic d...Determining the base sequence of DNA broken site is quite crucial for the study on the cleavage site specificity and mechanism of various natural or synthetic DNA cleavage regents,and on developing novel therapeutic drugs targeting at DNA.The most frequently used method depending on chemical reactions of the Maxam-Gilbert procedure,and the late arising methods used by Rui Ren et al.which were based on Sanger’s DNA sequencing strategy,all had some deficiencies,either the pollution of radioactive materials,or really complicated and difficult to operate.In the present paper,a new method for DNA cleavage site sequence determination was developed.The fluorescence FAM-labeled primer was annealed to the DNA fragments,which has been cleaved by restriction enzymes or other regents,and extended along the template sequence.The products then loaded onto the polyacrylamide electrophoresis gel of ABI 377 DNA Sequencer.Data was collected and analyzed by using ABI PRISM Data Collection Software and ABI PRISM Sequencing Analysis Software.It is proved to be a credible and simple new approach to determine the base sequence of DNA broken sites.展开更多
This paper reported the behavior of cyclic voltammetry (CV), differential pulsevoltammetry (DPV ) and spectroelectrochemistry (SEC) of Co2Co2-superoxide dismutase.The results obtained by CV and DPV were in agreement w...This paper reported the behavior of cyclic voltammetry (CV), differential pulsevoltammetry (DPV ) and spectroelectrochemistry (SEC) of Co2Co2-superoxide dismutase.The results obtained by CV and DPV were in agreement well with that obtained by SEC.The diffusion coefficient, the apparent number of electrons and oxidation-reductionpotentials were obtained.展开更多
The nucleation, growth and aggregation of calcium oxalate(CaC 2O 4) crystals were comparatively investigated in five different mimetic systems: water, NaCl solution, artificial urine, healthy urine and lithogenic urin...The nucleation, growth and aggregation of calcium oxalate(CaC 2O 4) crystals were comparatively investigated in five different mimetic systems: water, NaCl solution, artificial urine, healthy urine and lithogenic urine by using scanning electron microscopy(SEM). The effects of original concentration of calcium ion and oxalate ion and crystallization time on the morphology, density and the size of CaC 2O 4 crystals were discussed. In lithogenic urine, calcium oxalate monohydrate(COM) crystals were the dominant phase. However, a mixture of COM and calcium oxalate dihydrate(COD) with a molar ratio of about 3∶2 was obtained in the healthy urine. COD has a less affinity for renal tubule cell surface, so COD is easy to be expelled out from body and there is a less probability of stone-forming in the healthy urine. The fastest nucleation and growth of CaC 2O 4 crystals were obtained in water and NaCl solution, respectively. The size of CaC 2O 4 crystals decreases in the following order: NaCl solution>artificial urine>lithogenic urine>healthy urine>water.展开更多
文摘The title compound [Co(en) 2(H 2O) 2] 2· [Mo Ⅴ 4Mo Ⅵ 4V Ⅳ 8O 40 (AsO 4)] was synthesized by hydrothermal method and its structure was determined with single crystal X ray analysis. The cluster anion is a tetracapped Keggin polyanion, which contains different coordinated cations. The crystal is monoclinic, space group C2/c with a =1.458 3(2) nm, b =2.174 07(13) nm, c =1.893 2(2) nm, β =91.532°, V =6.000 2(10) nm 3, Z =2, D c=1.452 g/cm 3, R =0.035 9, R w=0.079 8, S =1.092.
文摘Copper(Ⅱ)-ferron(7-iodo-8-hydroxyquinoline-5-sulfonate) one-dimensional coordination polymer Na 2 n [Cu(Ferron) 2] n ·6 n H 2O was synthesized and investigated by X-ray diffraction method. The polymer exhibits a linear structure by the bis-iodine-axial coordination to the octahedral Cu(Ⅱ) center,which is stabilized by the iodine-aromatic ring(edge and face) and iodine-iodine interactions between the polymer lines,forming a special layer structure. The complex belongs to a triclinic system,space group P 1, a =0.648 4(19) nm, b =0.654 5(19) nm, c =1.911(6) nm, α=85.42(5)°,β=85.78(5)°,γ=72.99(4)°,V =0.772(4) nm 3 and Z=1 .
文摘Tetra\{\[4\|carboxymethoxyphenyl\]\}porphyrin copper(Ⅱ), nickel(Ⅱ), zinc(Ⅱ) complex and their dibutyltin(Ⅳ) ester derivatives have been synthesized and characterized. The equilibrium constants of the aggregation of the metal porphyrin and the equilibrium constant of the π\|π coordination with phenothoroline have been measured by using UV\|Vis titration method. The results show that the equilibrium constants decrease in the order of K \-\{CuP\}> K \-\{NiP\}> K \-\{ZnP\}. The vitro anti\|tumor activities of the dibutyltin(Ⅳ) metal porphyrinate has some relation with the ability of aggregation and coordination with ligand of the metal porphyrin.
文摘Determining the base sequence of DNA broken site is quite crucial for the study on the cleavage site specificity and mechanism of various natural or synthetic DNA cleavage regents,and on developing novel therapeutic drugs targeting at DNA.The most frequently used method depending on chemical reactions of the Maxam-Gilbert procedure,and the late arising methods used by Rui Ren et al.which were based on Sanger’s DNA sequencing strategy,all had some deficiencies,either the pollution of radioactive materials,or really complicated and difficult to operate.In the present paper,a new method for DNA cleavage site sequence determination was developed.The fluorescence FAM-labeled primer was annealed to the DNA fragments,which has been cleaved by restriction enzymes or other regents,and extended along the template sequence.The products then loaded onto the polyacrylamide electrophoresis gel of ABI 377 DNA Sequencer.Data was collected and analyzed by using ABI PRISM Data Collection Software and ABI PRISM Sequencing Analysis Software.It is proved to be a credible and simple new approach to determine the base sequence of DNA broken sites.
文摘This paper reported the behavior of cyclic voltammetry (CV), differential pulsevoltammetry (DPV ) and spectroelectrochemistry (SEC) of Co2Co2-superoxide dismutase.The results obtained by CV and DPV were in agreement well with that obtained by SEC.The diffusion coefficient, the apparent number of electrons and oxidation-reductionpotentials were obtained.
文摘The nucleation, growth and aggregation of calcium oxalate(CaC 2O 4) crystals were comparatively investigated in five different mimetic systems: water, NaCl solution, artificial urine, healthy urine and lithogenic urine by using scanning electron microscopy(SEM). The effects of original concentration of calcium ion and oxalate ion and crystallization time on the morphology, density and the size of CaC 2O 4 crystals were discussed. In lithogenic urine, calcium oxalate monohydrate(COM) crystals were the dominant phase. However, a mixture of COM and calcium oxalate dihydrate(COD) with a molar ratio of about 3∶2 was obtained in the healthy urine. COD has a less affinity for renal tubule cell surface, so COD is easy to be expelled out from body and there is a less probability of stone-forming in the healthy urine. The fastest nucleation and growth of CaC 2O 4 crystals were obtained in water and NaCl solution, respectively. The size of CaC 2O 4 crystals decreases in the following order: NaCl solution>artificial urine>lithogenic urine>healthy urine>water.
