最新刊期
      期 4 ， 1992
      • Zhou Maotang,Zhang Lihua
        Vol. 10, Issue 4, Pages: 193-197(1992)
        摘要：This article reviews the recent progress in application of high resolution 13C NMR in the study of radiation crosslinking of polymers. The emphasis is placed on the application of high resolution solid state 13C NMR in this particular field.  
        关键词：High resolution 13C NMR;Polymer;Radiation crosslinking;Dipolar decoupling   
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        发布时间：2023-04-23
      • Zheng Xiulong,Gao Jianguo,Yang Lixi
        Vol. 10, Issue 4, Pages: 198-202(1992)
        摘要：By the aid of a specific DNA polymerase α inhibiter NEM, the DNA polymerase β activity of irradiated platcau phase V79 cell nuclei was observed. The results showed: there was no influence on the polymerase β activity of celi nuclei (p>0.05). when the cells were treated with 4 or 10 mmol/L CM immeciately following 12 Gy irradiation. However, CM could depress polymerase β activity of cell nuclei evidently after 2-6 h incubation. The degree of inhibition was enhanced with the increasing CM dosage. and with the prolorgation of incubation time. It implied that CM could inhibit the DNA repair and enhance laciaticn-induced DNA danage. Its inhibition rule was similar to that of CM on the PLDR of plateau phase V79 cells under same experimental conditions. It is suggested that the inhibition of PLDR by CM might be through its effeet on polymerase β in DNA repair system, and then resulted in the enhancement of cell killing  
        关键词：Radiation;CM;Plateau phase V79 cells;DNA   
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        发布时间：2023-04-23
      • Chen Lishu,Tachibana H,Haruyama Y
        Vol. 10, Issue 4, Pages: 203-206,219(1992)
        摘要：The present work has dealt extensively and systematically with the effect of ambient temperature on the relative sensity of paramagentic centres for DL-alanine dosimeter during irradiation under the conditions of some other affecting factors unchanged. The average temperature coefficients obtained are 0.00252, 0.00222 and 0.00237℃-1 for the total doses of 105,104, and 103Gy respectively. The data are instructive not only in practical use of alanine/ESR dosimetry as a transfer dosimeter but also in examining the mechanism on formation of paramagnetic centres.  
        关键词：Alanine;Electron spin resonance;Dosimeter;Transfer dosimeter;Temperature coefficient   
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        发布时间：2023-04-23
      • Gu Meiyu,Xing Qianghua,Wang Chuanshan,Zhou Shuxin
        Vol. 10, Issue 4, Pages: 207-210(1992)
        摘要：Using the differential capacitance method and the midgape-votage shift technique to study the proton radiation induced interface traps and oxide traps in the Al-gate MOS structure. The results indicate that the overall density of the radiation-induced interface traps and oxide traps increase with proton energy and doses. These experimental results were explained in terms of the two-stage H+ process and TRIAM-89 computer simulation.  
        关键词：MOS Structure;Proton;Radiation   
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        发布时间：2023-04-23
      • Lin Xiao,Yan Wenge,Ji Yiping,Chen Jie,Xu Jiping
        Vol. 10, Issue 4, Pages: 211-213(1992)
        摘要：The gas condensates and polymers from plasma polymerization of VTMS in glow discharge were analyzed by means of GC-MS and PGC-MS, respectively. From the experimental results the reaction mechanism of polymerization of VTMS was deduced. Monomers were activated in the gas phase by electron bombardment and subsequently diffused to the substrate where they propagated and terminated.  
        关键词：Plasma polymerization;Vinyltrimethylsilane;Polymerization mechanism;Chromatography;Mass spectrography   
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        发布时间：2023-04-23
      • Qi Shengchu,Wang Demin,Han Zongzhan,Sun Piju
        Vol. 10, Issue 4, Pages: 214-219(1992)
        摘要：Using ab initio method, the minimum energy conformations and net charge distribution have been studied for H2CN radical isomers formed by addition of a H atom (or an electron) to HCN (or HNC) molecule. Calculations show that there are three possible isomers, namely H2CN(Ⅰ), H2CN(Ⅱ) and H2CN(Ⅲ). The order of relative stability is (Ⅰ)>(Ⅲ)>(Ⅱ). From quantum chemical study and the estimations in thermochemistry for the reactions (1) and (2), the possible role of H2CN radicals in prebiotic organic synthesis has been discussed and it has been proposed that H2CN(Ⅲ) radical is an important intermediate to synthesize amino acids. The results, show that HNC is also an important product in the evolution chain of biomolecules under some special conditions, such as the electric discharge for atmosphere.  
        关键词：ab initio calculation;H2CN radical;HCN;HNC;Amino acids α-aminoacetonitrile;Polyglycine   
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        发布时间：2023-04-23
      • Li Chaoshun,Zhang Yuhua,Qiao Baoyi
        Vol. 10, Issue 4, Pages: 220-222,231(1992)
        摘要：The method of gamma-ray preirradiation has been used to make resin with methacrylates being the main materials. After preirradiation, the resin was inradiated at low temperature to polymerize by UV-ray and the biological materials were embedded in the polymeric block at the same time. Then it was sectioned into superthin sectionings by ultramicrotome cutter. The superfine structures of the embedded biological materials were observed under electron microscopy.  
        关键词：γ-Preirradiation;UV-ray initiate;Superthin sectioning   
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        发布时间：2023-04-23
      • Chen Ruyan,Lan Junming,Yan Youqi,Tao Can,Li Shijie,Song Liangbi
        Vol. 10, Issue 4, Pages: 223-227(1992)
        摘要：The properties of industrial glucoamylase preparations (IGP) irradiated by γ rays were studied. The experimental results showed that the preservation period became longer and the hygienie quality was improved when the IGP was irradiated by γ rays with dose under 2 kGy. The irradiation does not have obvious poor effects on properties of IGP. Therefore the irradiated IGP could be used normally.  
        关键词：Glucoamylase;γ-irradiation;Enzyme activity   
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        发布时间：2023-04-23
      • Bai Yushu,Guan Shurong,Zhang Xiuxia
        Vol. 10, Issue 4, Pages: 228-231(1992)
        摘要：Biological doses of 5 cases exposed to 60Co γ-ray were estimated by the curves of relationships between radiation dose and chromosome aberations and micronuclei of peripheral blood lymphocytes. The results indicated that biological dose estimated by "die.+ r." and micronuclei were quite approximate to the physical dose at early phase of post irradiation. Specially, in 3 cases of uniform doses, the doses estimated by "dic.+ r." were nearly identical to the physical dose. At the same time, it was showed that dose estimated by micronuclei were higher than those of "dic.+ r." doses.  
        关键词：60Co γ-ray;Accidental radiation;Chromosome aberrations;Micronucleus;Biological dose   
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        发布时间：2023-04-23
      • Jiang Jie,Cai Lu,Wang Xianli
        Vol. 10, Issue 4, Pages: 232-235(1992)
        摘要：Human lymphocytes pre-treated by heat (41℃ 1 h), low dose irradiation (50 mGy), or both low dose radiation and heat together, became less susceptible to chromatid damage induced by subsequent high dose of X-rays. Either heat or low dose X-rays could significantly reduced the yield of chromatid aberrations, but the magnitude of adaptive response was not enhanced when combined treatment with low dose radiation and heat were used. The results implied that the mechanism of adaptive response induced by low dose X-rays was as same as the mechanism of adaptive response induced by hyperthermia, which may be related with some protective proteins.  
        关键词：Hyperthermia;Radiation;Chromatid aberration;Adaptive response;Heat shock protein   
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        发布时间：2023-04-23
      • Jiang Tao,Chen Deqing,Wang Chunyan
        Vol. 10, Issue 4, Pages: 236-239(1992)
        摘要：To test the effect of chronic pre-exposure of low dose 60Co γ-rays on the induction of the adaptive response in vivo, four groups of mice were whole-body irradiated with different doses of 9.3, 18.2, 37.2, and 72.9 mGy at 7.8, 15.1, 31.0, and 61.0×10-3 mGy/min respectively, and then irradiated with 1.5 Gy γ-rays 3 hours after the termination of pre-exposure. Mice bone marrow chromosome preparations were made 24 hours later. The results showed that mouse bone marrow cells pretreated with 18.2, 37.2 and 72.0 mGy but not 9.3 mGy60Co γ-rays yielded significant lower frequencies of chromatid aberration and acentric fragment induced by subsequent high dose exposure than expected, but did not yield significant lower freruencies of dicentric and ring. However significant reduction of aberrant cell frequencies induced by subsequent high does exposure were observed in all the four different pretreated dose groups. The magnitude of the reductions of total chromosnme aberration and aberrant cell frequencies increased with the increasing of the pretreated doses.  
        关键词：Adaptive response;Mouse bone marrow cells;Chromosome aberration;γ-rays;Chronic exposure   
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        发布时间：2023-04-23
      • Zhang Liazhen,Wang Shoufang,Deng Zhicheng,Zhan Jianhai,Hao Yayi,Wang Haiyan,Chen Baowen,Xing Xiaohong
        Vol. 10, Issue 4, Pages: 240-242,251(1992)
        摘要：Chromosomal aberration of human lymphocytes at G0 phases of cell cycle induced by tritium β-rays and 60Co γ-rays were investigated. Dose-response relationship has been observed (dose range from 0 to 0.5 Gy). The results showed that chromosomal type aberration is main aberration for both radiations and the data of dicentrics gave the best fit to the linear model respectively Y=- 0.0824+ 0.0555 D and Y=- 0.0719+0.0263 D. Taking 60Co γ-rays as a reference source, the RBE value of dicentrics for tritium β-rays irradiation was estimated to be 2.  
        关键词：Tritium β-rays;60Co γ-rays;Lymphocytes;Chromosomes aberrations;RBE   
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        发布时间：2023-04-23
      • Wang Ying,Wang Weiguo,Li Fengmei,Xie Liqing,Di Saojie,Lan Liqiao,Zhang Zheng,Yu Yawen
        Vol. 10, Issue 4, Pages: 243-245(1992)
        摘要：The result of healthy standard research for disinfestation insects of almond by γ-ray irradiation is described. The mortality of insects is more effective by using 1.0 kGy dose. The comparison of good product rate between irradiation and unirradiation has been studied. Result indicates that good product rate of irradiated sample is higher 20% than unirradiated.In addition, there are no significant difference between irradiated and unirradiated samples on nutrition and chemical parameters.  
        关键词：Almond;Radiation disinfestation;Plodia interpunctella hubner   
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        发布时间：2023-04-23
      • Shen Liying,Yuan Xingzheng,Gan Xiaoxian,Ding Jiangzu,Song Changcun,Fu Jinkang,Zhang Qiuyue
        Vol. 10, Issue 4, Pages: 246-248(1992)
        摘要：Homogenates of mouse brains harbouring toxoplasma NT strain cysts were irradiated at various doses of 60Co γ ray and digested with 0.4% trypsin buffer to release bradyzoites from cysts. The suspensions containing various number bradyzoites were obtained through a serial 10-fold dilution in saline solution and inoculated intraperitoneally into mice separately. Infectivity of toxoplasma bradyzoites was determined by bioassay of mice. A group of mice inoculated with non-irradiated bradyzoites was used as control. Results showed that the minimal effective dose of γ rays controlling infectivity of toxoplasma NT strain bradyzoites was 0.55 kGy. Effect of 0.1 kGy γ rays on infectivity of toxoplasma bradyzoites was not significant. Infectivity of bradyzoites irradiated at 0.45 kGy had 104 fold reduction in comparison with that of 0.1 kGy.  
        关键词：Irradiation;Toxoplasma gondii;Infectivity   
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        发布时间：2023-04-23
      • Li Zongju,Chen Zongdao,Xu Denyi
        Vol. 10, Issue 4, Pages: 249-251(1992)
        摘要：Peculiar flavor may be induced from irradiative preservation of meat with higher dose. The study on the irradiation of dried duck indicated that peculiar flavor is produced by a threshold of 1.5 kGy and intensifies with the increase of dose. The flavor primarily comes from muscle of dried duck especially from its water soluble protein. With the increase of dose, volatile carbonyl compounds, amines and sulfur compounds increased significantly. Paper chromagraphy analysis shows that two new volatile carbonyl compounds (Rf=0.23 and 0.28) and a new volatile amine-propamine are induced by irradiation. This compounds may be the source of peculiar flavor in irradiated dried duck.  
        关键词：Dried duck;γ-irradiation;Peculiar flavor   
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        发布时间：2023-04-23
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