最新刊期
      期 3 ， 1990
      • Qu Baojun,Shi Wenfang,B. Rånby
        Vol. 8, Issue 3, Pages: 129-135(1990)
        摘要：This work has made an explorotary study on photocrosslinking of LDPE as an insulating material. The kinetic character of photocrosslinking of LDPE in the melt, the enhanced photocrosslinking efficiency and mechanism of photoinitiating system, and the condition of reaction affecting the crosslinking processes, such as irradiation temperature and UV light intensity etc., have been studied in this paper. The crosslinking density, homogeneity of crosslinking and some physical properties of photocrosslinked products were examined. The results obtained show that the techchnique of photocrosslinking of LDPE in the melt is quite promising for the manufacture of wire and cable.  
        关键词：Photocrosslinking;Enhanced crosslinking;Low density polyethylene;Gel content;Crosslinking density;Homogeneity;Mechanical property   
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        发布时间：2023-04-23
      • Lü Gongxu,Bau Huaying,Jia Heisbeng,Chen Wenxiu
        Vol. 8, Issue 3, Pages: 136-140(1990)
        摘要：The polyethylene film grafted with acrylic acid then dyed with some dyestuffs and produced dyeing polyethylene dosifilm. The response of 60Co γ ray absorbed dose on these films is a linear. The different dose range dependents on different dyestuffs. The effect of temperature, relative humidities and irradiation angle during irradiation on the response and the deviation of measurement for these films are studied. The stability of these films before and after irradiation is studied too. The research results show that dyeing polyethylene dosifilm are suitable used as a routine dosimeter in radiation processing with 60Co gamma radiation.  
        关键词：Dyeing polyethylene;Dosimeter;Response characteristics;Stability   
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        发布时间：2023-04-23
      • Wang Xianli,Wang Bin,Sun Shuqing
        Vol. 8, Issue 3, Pages: 141-144(1990)
        摘要：It was compared for the translocation rate in spermatogonia of mice irradiated in local testis with that irradiated in whole body. The rate in irradiated groups increased linearly with doses. The coefficient of two equations for dose-effect is significant difference, it is higher in whole-body irradiated group than that in local testis irradiated group. The estimate for genetic risk resulted from the whole -body irradiated experiments is not suitable, if so, it will be higher. Andso the evaluating the genetic risk for reproduction system irradiated should be basic on the data of local radiation in the testis.  
        关键词：Spermatogonia;Genetic risk;Germ cells Chromosome aberration   
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        发布时间：2023-04-23
      • He Jian,Zhou Qiling,Xing Guoren,Zheng Decun,Su Ruizhen,Chen Qu-e
        Vol. 8, Issue 3, Pages: 145-149(1990)
        摘要：For accompanying with space radiobiological studies,dry eggs of native Artemia were irradiated in the laboratory by 14 Mev fast neutrons and 60Co γ-rays, and their development was then followed. Doses of the fast neutrons used were 10,50 100,200,400,600,800 and 1000 Gy, and those of γ-rays were 50,100,500,1000 and 2000 Gy respectively. The irradiated eggs, together with the control, were stored at 4℃ before incubation and observations.The results are as follows: (1) A significant delay of early development was seen in eggs irradiated by both radiations. (2) The rates of emergence and hatching decreased with the increase of the doses, and went down further after the prolongation of egg-storage at 4℃. (3) The mortality peak of the larvae hatched from irradiated eggs appeared within 2—5 days after hatching, and the RBE's of the fast neutrons, for LD50, comparing with the γ-rays were found to be 1.80 on the 3 rd day, 2.44 on the 4th day, and 2.27 on the 5th day.  
        关键词：Artemia eggs;Fast-neutron irradiation;γ-irradiation;Development;RBE   
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        发布时间：2023-04-23
      • Jiang Yifeng,Zheng Xiulong
        Vol. 8, Issue 3, Pages: 150-154,144(1990)
        摘要：The effects of DNA polymerase alpha and beta on DNA repair of the 40 Gy γ-rays irradiated H22 cell nuclei, using specific inhibitor NEM or ddTTP to DNA polymerase alpha or beta respectively, were observed. The results showed that the rate of DNA repair synthesis of the 40 Gy γ-rays irradiated H22 cell nuclei was much higher than that of the non-irradiated ones after 60,120 min incubation at 37℃(P<0.05,P<0.01)when DNA polymerase alpha was inhibited completely. There was no difference in the rate of DNA repair synthesis between the irradiated and the non-irradiated cell nuclei (P>0.05) when DNA polymerase beta was inhibited completely. And also, there was no difference between them (P>0.05) when both DNA polymerase alpha and beta were inhibited completely. These results indicate that under our experimental conditions, DNA polymerase beta, not alpha, is responsible for DNA repair of the γ-rays irradiated H22 cell nuclei. The above results are discussed by the author considerably.  
        关键词：DNA polymerase alpha;DNA polymerase beta DNA repair;NEM;ddTTP   
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        发布时间：2023-04-23
      • Zhang Wanxi,Lü Yingtao,Sun Jiazhen
        Vol. 8, Issue 3, Pages: 155-158(1990)
        摘要：In this paper, the radiation effects on PVF2/PEA blend are studied by DSC and it is found that the meltting peaks split in the DSC of PVF2/PEA blend. The method to calculate βb value of PVF2/PEA blend system have been established and the relationship(1) between sol fraction and radiation dose for single linear polymer is popularized to the blend tystem.  
        关键词：Poly (vinylidene fluoride);Poly (ethyl aerylate);Radiation crosslinking;Glass transition temperature;Blend   
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        发布时间：2023-04-23
      • Gu Ruiqi,Shen Huiming
        Vol. 8, Issue 3, Pages: 159-162,172(1990)
        摘要：Fractionated irradiation is one of the important methods studying repair of radiation damage. Some authors reported that caffeine, a repair inhibitor, had no effects on fractionated irradiation in human cell, animal cell and Vicia faba. And they concluded that caffeine inhibited the repair of potentially lethal damage(PLD), but did not inhibit the repair of sub-lethal damage (SLD). In this study, the effect of caffeine on the repair of PLD and SLD were reexamined in wheat and barley systems. The germinating seeds of wheat of barley were pre-irradiation treated 3 h with 5 × 10-3 mol/L caffeine, then they were irradiated by single or fractionated X-ray doses. The results showed that after caffeine treatment the effect of fractionated irradiation was disappeared. In this case, caffeine not only inhibited the repair of PLD but also inhibited the repair SLD.In previous fracttionated radiation experiments, the repairs during interval were discussed in detail, but the repairs after whole irradiation were neglected. According to the results of this experiment and some early reports about fractionated irradiation, the repair efficiency during interval and the repair function after whole irradiation were discussed.  
        关键词：Fractionated irradiation;Caffeine;Sub-lethal damage;Potentially lethal damage;Repair;Wheat and barley   
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        发布时间：2023-04-23
      • Guo Jinhui,Ha Hongfei,Zhang Yuhua
        Vol. 8, Issue 3, Pages: 163-167(1990)
        摘要：In this work films of silicone (silastic) were grafted by monomer acrylamide vis γ-radiation technology and then the ovine anti-human IgG, Epidemic hemorrhagic fever (EHF)-MCAb were immobilized on the silastic-AAM films with different grafting yields passthrough associate reactions. Measurements of relationships between grafting yields. contents of immobilized antibodies and immunoactivities for immobilized silastic-AAM films were performed by using 125I method ELISA method was used to measure the immunoactivities for the immobilized monoantibody. The results showed that the antibodies used can be immobilized on radiation-grafted silicone films and this immobilization method has its potential significance in clinical practice.  
        关键词：Radiation grafting;Immobilization;125I laber method;ELISA method;Immunoactivity;Ovine antihuman IgG;Etidemic hemorrhagic fever monoantibody (E5)   
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        发布时间：2023-04-23
      • Yu Ye,Cao Jin,Su Zongxian,Chen Zhixiong
        Vol. 8, Issue 3, Pages: 168-172(1990)
        摘要：The paper deals with the preparation of immobilized glucose oxidase membrane by using two steps irradiation (irradiation gratfting, irradiation entrapping). Some properties of membrane were discussed. The immobilized glucose oxidase membrane with oxygen electrode and oxygen analyser can be satisfied with the clinic analysis for the determination of serum glucose.  
        关键词：Immobilized enzyme membrane;Irradiation grafting;Irradiation entrapping;Nylon net;HEMA   
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        发布时间：2023-04-23
      • Zhang Yuanqiang,Huang Weiquan,Wang Wenchao,Guo Yao
        Vol. 8, Issue 3, Pages: 173-176,181(1990)
        摘要：The effect of ionizing radiation on peritoneal macrophages of mice was investigated by means of the quantitative enzyme cytochemistry and the cyclic nucleotide immunocytochemistry. It was found that the activities of the lysosomal enzyme (AcPase and ANAE) and ATPase of macrophages were remarkably changed after the animals were irradiated (60Co γ-ray, 8 Gy). Further studies demonstrated that the specific immunofluorescence of cAMP and cGMP in macrophages was apparently influenced as compared with the control group. It is considered that ionizing radiation changes the structrue of membrane and enzyme proteins of macrophages by the cyclic nucleotide (cAMP and cGMP). The mechanism of the effect of ionizing radiation on macrophage will be further studied.  
        关键词：Ionizing radiation;Enzyme cytochemistry;Fluorescent antibody technic;Macrophage;Mouse   
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        发布时间：2023-04-23
      • Fu Junwu,Xiao Jiyue,Li Guixin
        Vol. 8, Issue 3, Pages: 177-181(1990)
        摘要：This paper mainly deals with the rules governing the change of the content of the trace element in irradiated Baishaye wine. The results of chromatographic analysis show that the contents of total acid, ester, aldehade and high-grade alchol for Baishaye wine can be enhanced by irradration and the impare alcoholis oil of the wilre be deerlased by irradiation thus, the quality of the wine can be imporoved and the period of preservation may be shortened.  
        关键词：Baishaye wine;irradiation;trace element   
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        发布时间：2023-04-23
      • Yang Hongxiu,Zhang Yongming,Ma Zhongqian
        Vol. 8, Issue 3, Pages: 182-184(1990)
        摘要：In this paper, effect of 60Coγ-irradiation on the catalytic activity of perovskite rare earth cobaltites LaCoO3 for CO oxidation reaction has been studied.The Co2+ and chemisorption oxygen content in the LaCoO3 catalyst increased with increasing γ-dose. It was also found that the catalytic activity for CO oxidation is proportional to the bivalent cobalt ion in LaCoO3. A mechanism involving the bivalent state of Co has been proposed to explain these results.  
        关键词：Radiation effects;CO oxidation reaction;Catalytic activity;LaCoO3 catalyst   
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        发布时间：2023-04-23
      • He Jiewei,Le Ming,Jiang Yamei,Gao Sumei
        Vol. 8, Issue 3, Pages: 185-187(1990)
        摘要：Wistar rats were gamma-irradiated at a dose rate of 0.98 Gy/min with cumulative doses of 10 Gy. It was found that the content of atrial natriuretic factor in serum increased significantly after irradiation at 4, 24, 48 hour. The content of atrial natriuretic factor in heart increased significantly after irradiation at 4, 24 hour, but at 48 hour the content of atrial natriuretic factor was about normal. The content of atrial natriuretic factor and the early effect of ionizing radiation is discussed.  
        关键词：Radiation effect;Atrial natriuretic factor   
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        发布时间：2023-04-23
      • Zhu Bingchai,Chen Tiehe,Jiang Meiying,Chen Wenzhen,Ji Pinfang,Jin Zhifong
        Vol. 8, Issue 3, Pages: 188-190(1990)
        摘要：Effects of hyperbaric oxygen (HBO) treatment on chromosome aberrations in peripheral lymphocytes in rabbits induced by 60Co γ-rays irradiation were studied. It was found that there is no effect of HBO itself on chromosomes in peripheral lymphocytes, and definite promotion effect of HBO treatment on recovery of chromosome damage in peripheral lymphocytes in rabbits induced by irradiation.  
        关键词：γ-ray irradiation;Hyperbaric oxygen;Chromosome aberration   
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        发布时间：2023-04-23
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