The content of nickel of nitinol alloy isabout 50%, it is higher than that of 316 L stainless steel for surgical implantation, and lower than that of nickel based alloy for prosthetic dentistry. Nitinol alloy is impla...The content of nickel of nitinol alloy isabout 50%, it is higher than that of 316 L stainless steel for surgical implantation, and lower than that of nickel based alloy for prosthetic dentistry. Nitinol alloy is implanted to the dog’s body, the effect of nickel in nitinol to the animal’s body is explored by the analyzing the trace element of nickel in the dog’s hair before and after implantation. Experimental results show that after 2 years implantation of nitinol alloy, the nickel content in the hair is not markedly increased. By measuring the weight, height and length of the animal periodically, and contrasting with normal data, no impairment of growth of the animal is observed. The ability of the animal to distinguish men and objects is also normal. The weighing test of the alloy sample taken out after 2 years implantation, shows that its anti-corrosion effect belongs to the very strong grade. It shows that during the long period of nitinol implantation into the animal’s body, there is no evidence that the free nickel or nickel compound present in tissue is harmful to the animal.展开更多
Repair effects of rutin and quercetin on purine deoxynucleotide radical cations were studied using pulse radiolysis technique. On electron pulse irradiation of N2 saturated deoxynucleotide aqueous solution containing ...Repair effects of rutin and quercetin on purine deoxynucleotide radical cations were studied using pulse radiolysis technique. On electron pulse irradiation of N2 saturated deoxynucleotide aqueous solution containing 20 mmol/L K2S2O8, 200 mmol/L t-BuOH and rutin or quercetin, the transient absorption spectra of the deoxynucleotide radical cations decayed quickly. At the same time, the spectra of flavonoid phenoxyl radicals formed within several dozen microseconds. The results indicated that deoxynucleotide radical cations can be repaired by flavonoids. The rate constants of the repair reactions were 3.8×108-4.4×108 mol-1·L·s-1 and 1.3×108-1.8×108 mol-1·L·s-1 for dAMP and dGMP radical cations, respectively.展开更多
Ⅰ. INTRODUCTION Protium and deuterium are stable isotopes of hydrogen. The protium nucleus contains a proton without neutron, but deuterium nucleus contains a neutron in addition to a proton. A deuteron has twice the...Ⅰ. INTRODUCTION Protium and deuterium are stable isotopes of hydrogen. The protium nucleus contains a proton without neutron, but deuterium nucleus contains a neutron in addition to a proton. A deuteron has twice the mass of a proton. Hence, when protium in a biological system is replaced by deuterium the mass effect of deuterium should not be neglected.展开更多
文摘The content of nickel of nitinol alloy isabout 50%, it is higher than that of 316 L stainless steel for surgical implantation, and lower than that of nickel based alloy for prosthetic dentistry. Nitinol alloy is implanted to the dog’s body, the effect of nickel in nitinol to the animal’s body is explored by the analyzing the trace element of nickel in the dog’s hair before and after implantation. Experimental results show that after 2 years implantation of nitinol alloy, the nickel content in the hair is not markedly increased. By measuring the weight, height and length of the animal periodically, and contrasting with normal data, no impairment of growth of the animal is observed. The ability of the animal to distinguish men and objects is also normal. The weighing test of the alloy sample taken out after 2 years implantation, shows that its anti-corrosion effect belongs to the very strong grade. It shows that during the long period of nitinol implantation into the animal’s body, there is no evidence that the free nickel or nickel compound present in tissue is harmful to the animal.
基金This work was supported partly by the National Natural Science Foundation of China (Grant No.39870902), the Doctoral Programme of the Education Ministry of China, and the China-France Cooperative Research Sponsored by the Education Ministry of China.
文摘Repair effects of rutin and quercetin on purine deoxynucleotide radical cations were studied using pulse radiolysis technique. On electron pulse irradiation of N2 saturated deoxynucleotide aqueous solution containing 20 mmol/L K2S2O8, 200 mmol/L t-BuOH and rutin or quercetin, the transient absorption spectra of the deoxynucleotide radical cations decayed quickly. At the same time, the spectra of flavonoid phenoxyl radicals formed within several dozen microseconds. The results indicated that deoxynucleotide radical cations can be repaired by flavonoids. The rate constants of the repair reactions were 3.8×108-4.4×108 mol-1·L·s-1 and 1.3×108-1.8×108 mol-1·L·s-1 for dAMP and dGMP radical cations, respectively.
文摘Ⅰ. INTRODUCTION Protium and deuterium are stable isotopes of hydrogen. The protium nucleus contains a proton without neutron, but deuterium nucleus contains a neutron in addition to a proton. A deuteron has twice the mass of a proton. Hence, when protium in a biological system is replaced by deuterium the mass effect of deuterium should not be neglected.
