最新刊期
      期 3 ， 1991
      • Luo Jian,Lin Nianyun,Zhang Jiashan
        Vol. 9, Issue 3, Pages: 129-133(1991)
        摘要：The radioprotective effect exerted by hydroxy cinnamic acid derivatives on the radiation damage of DNA, such as double-strand break (DSB), intermolecular crosslinking (CL), has been studied by gel electrophoresis. The molecular length distribution of DNA can be measured by this method, and by comparing average molecular length of DNA before and after irradiation, the frequency of DSB and CL can be determined quantitatively. The radioprotective effect of caffeic acid and sinapine on calf thymus DNA in binary system at room temperature have been determined. Both caffeic acid and sinapine reveal apparent protective effects and the former is stronger than the latter. The mechanism of radioprotection at room temperature has been discussed. Based on this finding, combined with the previous ESR study and an analysis of the molecular structure about these two protectors, it is suggested that the target is protected as a result of hydrogen atom transfering from protector to target.  
        关键词：DNA;Hydroxy cinnamic acid;Radioprotection;Gel electrophoresis   
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        发布时间：2023-04-23
      • Li Cui,Liu Junchen,Liu Songqing,Wang Fengju,Murat,Han Jingping
        Vol. 9, Issue 3, Pages: 134-138(1991)
        摘要：To increase RSO2Cl yield of γ-radiation sulfochlorination of MPN, this paper studied the sensitization effect of AIBN on the radiation sulfochlorination of MPN and discussed the sensitization mechanisms. The RSO2Cl yields were greatly increased for radiation sulfochlorination of MPN by AIBN sensitization.  
        关键词：γ-radiation;Sulfochlorination;AIBN   
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        发布时间：2023-04-23
      • Liu Zhensheng,Qiu Quanfa,Huang Wenzhong,Mei Mantong,T.C.H. Yang
        Vol. 9, Issue 3, Pages: 139-144(1991)
        摘要：The dried rice seeds were irradiated with accelerated 56Fe, 40Ar ions beams, or 60Co γ-rays at various doses and the effects on seeding growth, as well as micronuclei and chromosome aberration induction were oberved. The results indicated that the seeding height reduction, frequency of micronucleated cells and frequency of chromosome aberrations all appeared to dose dependent for these three types of rediation. The RBE value for seeding height reduction, determined at fifty percent of hight inhibition level, was found to be about 6.3, 1.9 and 1 for 56Fe, 40Ar and 60Co γ-ray respectively. However, the RBE values for the frequency of micronucleated cells were about 11,4 and 1 for 56Fe, 40Ar particles, and 60Co γ-ray. It appeared that the effectiveness of high LET radiation in inducing biological effects at the first generation was higler than that of low LET radiation, especially in inducing the microruclei formation.  
        关键词：Heavy ions;60Co γ-ray;RBE;Rice seeds   
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        发布时间：2023-04-23
      • Zhang Peng,Zheng Xiulong
        Vol. 9, Issue 3, Pages: 145-149(1991)
        摘要：Formation of micronuclei and binucleate cells and their relationships with cell survival were studied in the aerobically- and anaerobically-irradiated 3T3 cells. The results showed that frequency of micronuclei, percentage of micronucleus cells and percentage of binucleate cells increased linearly with the radiation dose in certain range. Oxygen enhancement ratios (OER) of micronucleus frequency, percentage of micronucleus cells, percentage of binucleate cells and cell survival were 2.02,1.96, 1.87 and 1.83, respectively. The percentage of micronucleus cells or percentage of micronucleus cells plus binucleate cells correlated negatively well with cell survival. The mechanism of oxygen effect in the radiation response of 3T3 cells and the significance of formation of micronuclei and binucleate cells were discussed.  
        关键词：3T3 cells;Micronuclei;Binucleate cells;Oxygen effect   
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        发布时间：2023-04-23
      • Qi shengchu,Yuan Shaohua,Wu Jilan
        Vol. 9, Issue 3, Pages: 150-155(1991)
        摘要：The effect of pH and ethenol concentration on the formation of peroxide has been studied on the irradiation of liquor made from dried sweet potato and the aqueous solution of ethanol. Hydrogen peroxide (92%) and organic peroxide (8%)are produced when the liquor is irradiated in the range of pH from 4 to 9 but no organic peroxide at the pH less than 2.5 and in the aqueous solution of ethanol over a wide concentrations of ethanol. G(H2O2) and G(total peroxide) are equal to 3.6±0.3 and 2.9±0.2 for 0.2% (V/V) aqueous solution of ethanol and the liquor containing 0.2% ethanol and 4.3±0.1 and 3.6±0.3 for 57% aqueous solution of ethanol and the liquor (containing 57% ethanol), respectively. Over a wide ethanol concentration range, there is no organic peroxide in the irradiated aqueous solution of ethanol, it shows that organic peroxide does not formed from ethanol and it could result from the other composition radicals in the liquor.  
        关键词：Liquor;Radiolysis;Peroxide;Ethanol   
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        发布时间：2023-04-23
      • Zhou Yiqin,Xu Haiyan,Zhang Jixiang
        Vol. 9, Issue 3, Pages: 156-161(1991)
        摘要：The detrapping current from polyethylene naphthalate (PEN) films γ-irradiated at doses ranged over 5×108Gy was determined by using of thermally stimulated current technique with various electrode materials. The sign transition of main species of charge carriers in biaxial stretched PEN films has been observed. It was explained, that the sign transition results from shifting of sub-Fermi levels of electrons and holes, since the γ-irradiation induces decreasing of mean trap levels. The de-electreting phenomena of both amorphous and biaxial stretched PEN electrets have been investigated. The mechanism of moving of charge carriers during de-electreting has been discussed.  
        关键词：Electret;Thermally stimulated current;Detrapping;Mean trap depth;Main species of charge carriers   
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        发布时间：2023-04-23
      • Tian Wuxun,Wang Deheng,Zhang Hongyuan,Wen Quanfa,Zhao Shanyin,Hu Yuexin
        Vol. 9, Issue 3, Pages: 162-166(1991)
        摘要：After i. v, 89Sr-retention in rats showed a sigificant difference between the young group and the other two groups, the adult and old groups but there is no significnit difference between the latter two groups. The retention fraction for 89Sr in the slow compartment of bone in the young group was higher than in the adult or old groups, but effective half-life (Te2) in this group was lower than in the latter two groups. The whole body dose estimed for young group was 6.0 and 7.0 times higher than those of adult and old groups respectively. However the dose of bone in young group was 4.7 and 6.9 times higher than those of the latter two groups.  
        关键词：89Sr;Retention;Internal dose;Age difference;Rat   
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        发布时间：2023-04-23
      • Liang Liang,Li Ming,Wan Guoxiong,Zhang Zhiping,Ying Shengkang
        Vol. 9, Issue 3, Pages: 167-172(1991)
        摘要：The present study has been carried out with a view to show the properties of poly(styrene-butadiene-4-vinylpyridine) triblcck copolymer irradiated by 60Co gamma-ray. The experiments reported here have indicated that the content of gel in polymer is above 90% when irradiation dose is 105 Gy.Meanwhile, FTIR spectra of copolymer by irradiated confirm the double bonds in polybutadiene domain are disappeared and TEM spectra of copolymer before and after irradiation reveal the morphology of copolymer dose not effected by irradiation.The research has been done demonstrates the Poly(styrene-butadiene-4-vinylpyridine) triblock copolymer irradiated by gamma-ray have advanced properties to withstand chemical agents, strong acid and alkali. On the other hand, comparing with the unirradiated polymer, the polymor irradiated by gamma-ray exhibits higher stress and lower strain. The elastica modulus of polymer irradiated by gamma-ray keeps unchange from 0 to 60℃. From this experiments one came to realize poly(styrene-butadiene-4-vinylpyridine) triblock copolymer irradiated by gamma-ray are favourble for fabricating charge-mosaic membrane, which could be used in desalination and purification of biochemicals.  
        关键词：Irradiation;Poly (styrene-butadiene-4-vinylpyridine);Block copo lymer;Charge-mosaic membrane   
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        发布时间：2023-04-23
      • Meng Xiangshun,Zhao Fang,Gao Jianguo,Zheng Xiulong,Li Shuan,Fang Jiasheng,Shi Wenping,Huang Bencai
        Vol. 9, Issue 3, Pages: 173-177(1991)
        摘要：The radiosensitizing effect of carboxyethylgermanii sesquioxidum was determined by the frequency of micronuclei and regrowth delay. The results showed that the radiosensitization effect was observed under hypoxia condition and the value of sensitizing effect ratio SER) were 1.22 and 1.18 respectively in vivo and in vitro.  
        关键词：Radiosensitizer;Carboxyethylgermanii sesquioxidum;Micronuclei;Regrowth delay;SER value   
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        发布时间：2023-04-23
      • Liu Jinwen,Li Qinghe,Zhang Rulin
        Vol. 9, Issue 3, Pages: 178-181,161(1991)
        摘要：Using conventional micronucleus and cytokinesis-block micronucleus of micro-blood, for the subjects of roentgenography upper gastrointestinal once the changes of micronucleus were observed before exposure and 24 h, 1,4 and 9 months after exposure. The results showed that micronucleus of subjects were exposure to a average absorbed doses of two parts for 5.29 cGy, it was raised 24 h after exposure but reduced at 1 month and 4 months or 9 months reached the same level with before exposure. Then, the low dose effects and roentgenography interval were discussed.  
        关键词：Roentgenography barium;Conventional micronucleus;Cytokinesisblock micronucleus;Roentgenography interval   
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        发布时间：2023-04-23
      • Bai Yushu,Zhang Xiuxia,Guan Shurong,Wu Hong
        Vol. 9, Issue 3, Pages: 182-185(1991)
        摘要：The changes in the frequencies of micronuclei in CB cells were observed after irradiations of rabbits exposed to single or fractionated wholebody 60Co γ-rays. The frequencies of micronuclei showed a increase with the doses. At the same doses micronucleus frequencies in wholebody irradiations were higher than those in fractionated irradiations. The differences between them were very significant at 4 Gy dose. Micronucleus frequencies in single irradiations gave the best to the second degree polynomial model (), but micronucleus frequencies in fractionated irradiations gave the best to the quadratic equation ().  
        关键词：Fractionated irradiations;Rabbit;Micronuclei;Cytokinesis-block method;Cytochalasin-B   
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        发布时间：2023-04-23
      • Yan Wenge,Chen Jie,Lu Lizhen
        Vol. 9, Issue 3, Pages: 186-189(1991)
        摘要：In capacitively coupled RF glow discharge with external electrodes, plasma copolymerizations of Vinyltrimethylsilane (VTMS) with benzene (Bz), Styrene(St) and hexafluoropropylene (HFP) were caried out. The properties of the copolymer were studied by IR, TG, moisture-protection and contact angle measurements. The copolymer films of VTMS with Bz and St showed good moisture-protection properties.  
        关键词：Plasma;Copolymerization;Vinyltrimethylsilane;IR;TG   
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        发布时间：2023-04-23
      • Shao Songsheng,Feng Jialin,Weng Zhigen,Jiang Qingqi,Wang Guomin,Zhang Yuanfang,Zhang Renan
        Vol. 9, Issue 3, Pages: 190-192(1991)
        摘要：The radiation dose and the chromosomal aberrations of peripheral lymphocytes were studied in 20 patients during ESWL. The dose was measured with calibrated thermoluminescent dosimeters. Primary results showed an average skin exposure 4.50×10-3C/kg per case. The dose level is smilar to that of the patients undergoing routine fluoroscopic examination. Therefore, the radiation exposure with patients from the ESWL procedure should be considered acceptable. As chromosome change, to reduce the radiation dose is important for the radiation cytogentics. The factors influencing exposure levels include stone characteristies and physician experience.  
        关键词：Extracorporeal shock wave lithotriptor (ESWL);Chromosome aberration;Radiation dose;Ureteral stone   
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        发布时间：2023-04-23
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