最新刊期
      卷 8 ， 期 4 ， 1990
      • He Tao,Xia Shouxuan
        Vol. 8, Issue 4, Pages: 193-198(1990)
        摘要：Simplified fluorometric assay of DNA unwinding was used to detect DNA strand breaks in HeLa S 3 cells after γ-irradiation. Linear dose-response curve was obtained within 10 Gy. In the presence of 3-aminobenzamide(3 AB), a specific inhibitor of poly (ADP-ribose) transferase, the rejoining of DNA strand breaks in HeLa S 3 cells after γ-irradiation was inhibited. 3AB also lowered the clone formation ability of HeLa S 3 cells after irradiation. No DNA strand breakage and cytotoxicity were seen when HeLa S 3 cells were treated with 3AB alone.  
        关键词：DNAstrand break rejoining;Poly (ADP-ribose) transferase;3-Aminobenzamide (3AB);Radiosensitization   
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        发布时间：2024-11-05
      • Kang Xin,Fang Yunzhong
        Vol. 8, Issue 4, Pages: 199-202(1990)
        摘要：Fluorescent dyes, 1-anilino-naphthalene sulfonate (ANS) and 1,6-diphenyl-1,3,5-hexatriene (DPH), were used as probes to examine the effect of γ-irradiation on the rat erythrocyte membrane.After irradiation of rat erythrocyte membrane in vitro, the fluorescence intensity of membrane-associated ANS decreased with the increase of irradiation dose (10-40 Gy).Similar results were also observed in the experiment of irradiation in vivo as showed by the decrease of fluorescence intensity of DPH probe in the erythrocyte membrane as well as the increase of its polarization on the 1 st, 3 rd, 5 th day following whole body irradiation with 8.5 Gy.Those results reflected the decrease of membrane fluidity which was suggested to be resulted from lipid peroxidation of polyunsaturated fatty acid in membrane induced by γ-irradiation in vitro and in vivo.  
        关键词：Fluorescent probe;Erythrocyte membrane;γ-ray;Irradiation in vitro;Irradiation in vivo   
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        发布时间：2024-11-05
      • Wang Mingjun,Zhang Shijie
        Vol. 8, Issue 4, Pages: 203-209(1990)
        摘要：In this paper, the kinetics of gel formation in the radiation crosslinking reaction was investigated for dimethyl silicone rubber (DMSR) and methyl vinyl silicone rubber (MVSR) with different vinyl contents. At 0—100 kGy dose range, the following results can be obtained by experiments, namely the degree of crosslinking per unit dose (q0) is constant, and the relationship between sol molecular weight ( and dose (R) may be described as following equation:b value is 0.70 for DMSR, and 0.77—0.80 for MVSR with various vinyl content. From the kinetics equation of gel formation, the distribution of gel and sol in the process of radiation crosslinking of silicone rubber can be discussed according to the following eq.;β value is 0.30 for DMSR and 0.20—0.23 for MVSR with various vinyl content.  
        关键词：Methyl vinyl silicone rubber;Vinyl content;Kinetics of gel formation;Radiation crosslinking;Sol molecular weight;Distribution of sol and gel   
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        发布时间：2024-11-05
      • Ruan Jihong,Guo Baojiang,Su Liangheng
        Vol. 8, Issue 4, Pages: 210-213(1990)
        摘要：In this paper the effect of polysaccharide-Protein on radiation induced protective is explored. the micronucleus frequency in Mouse bone marrow polychroma tophilic erythrblasts (PCE) and Leukocyte of Peripheral Blood are used as a criterion to explore. The results show that the Polysaccharide-Protein of Spirulina platensis are able to reduce the change of pernicious with γ-rays considerably and reduce the incision of heredity.It is possible for the Polysaccharide-Protein of Spirulina platensis to act as a new natural radiation protective agent of efficaciousness.  
        关键词：Spirulina platensis;Polysaccharide-Protein;MN-PCE;Leukocyte;Radiation;Mouse.   
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        发布时间：2024-11-05
      • Fang Yuee,Li Ximing,Shi Tianyi,Zhang Shaobin,Du Zhuodong,Yu Shuqi,Feng Shengyu
        Vol. 8, Issue 4, Pages: 214-218(1990)
        摘要：In this work, the silicone rubbers of the containing additives were vulcanized by 60Co gamma ray radiation. Novel high strength silicone rubbers were prepared under varying vulcanization conditions. The tensile strength and the tearing strength of the silicone rubbers were 11.40 Mpa and 42.03 kN/m, respectively.The effect of the radiation condition on the gel fraction, crosslinking regulation, and the network molecular weight were studied. The ratio of the probability of chain scission to the probability of crosslinking (p0/q0), the initial gel dose (Dg),and crosslinking G value were 0.22, 0.8 kGy, and 9.1, respectively.For extensive application, study of high strength silicone rubber has great significance.  
        关键词：Radiation vulcanization;High strength silicone rubber;Tensile strength;Tearing strength;Crosslinking regulation;Crosslinking G value   
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        发布时间：2024-11-05
      • Shi Tianyi,Fang Yuee,Wang Lifeng
        Vol. 8, Issue 4, Pages: 219-223(1990)
        摘要：In this paper, kinetics of the 60Co gamma ray induced graft copolymerization of mixture of methyl methacrylate and acrylonitrile onto wool was studied in detail. The results shown the following functional relationship equation:The apparent activation energy and the collision frequency factor of the grafting copolymerization are 14.23 kJ/mol and 278 g%h-0.65kGy-0.35mol-0.8L0.8, respectively.The work established that the relationship of the grafting copolymerization rate with T, [M]0 and relational expression at arbitrary temperature:  
        关键词：Wool;Radiation graft;Methyl methacrylate;Acrylonitrile   
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        发布时间：2024-11-05
      • Ma Yuguang,Yang Meilin,Tan Jiwen,Lin Dehou,Shen Jiacong
        Vol. 8, Issue 4, Pages: 224-227(1990)
        摘要：The peroxide free radicals exist in the surface of PTFE films treated by plasma. These free radicals can react with AM to form a grafted layer. XPS analysis showed that there are O and N elementary on PTFE surfaces after grafting. The surface energy of grafted layer is 35-40 dyn/cm as same as that of polyacrylamide. The amount of grafted AM is affected by plasma treating time and postpolymerization time. The postpolymerization is very complicated.  
        关键词：Plasma;Graft copolymerization;PTFE;Acrylamide   
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        发布时间：2024-11-05
      • Zeng Guiying,Han Shichen,Liu Jian,Liu Aiping,Zhou Yuankai
        Vol. 8, Issue 4, Pages: 228-230(1990)
        摘要：Two cell-free filtrates were obtained by filtering the fresh crypt cell suspensions which were pretreated with freeze-thawing and ultrasonic disintegration respectively through the G6 funnel. 0.4 ml of each filtrate or the fresh crypt cell suspension was administered separately into the lumen of a 3 cm jejunal segment in BALB/c mouse 1-3 hours following 15 Gy γ-ray total-body irradiation. Seventy-two hours later,no regenerating crypt could be found and the villi become remarkably shorter in the irradiated control, while in the jejunal segments receiving both filtrates or the fresh crypt cell suspensions, numerous newly-formed crypts were visible with the villi apparently normal, meanwhile, the columnar, goblet, argentaffin, Paneth cells as well as undifferentiated cells could, be identified in the crypt region under electron microscope. The new crypts were found to exist persistently in 14 days' experimental period after 9.4 Gy γ-ray abdominal irradiation and filtrates administration. The above findings suggest the presence of a crypt repair factor in cell-free filtrates prepared from the intestinal crypt cell suspension of normal mice.  
        关键词：Intestinal crypt;Irradiation;Regeneration;Cell-free filtrate   
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        发布时间：2024-11-05
      • Lin Xiao,Chen Jie,Xu Jiping
        Vol. 8, Issue 4, Pages: 231-234(1990)
        摘要：The plasma polymerization of mixtures of hexamethyldisiloxane(HMDSO) and tetrafluoromethane (TFM) was carried out in the bell jar type with internal electrode. The structure of polymerized films was characterized with IR, XPS, X-ray. HMDSO/TFM were plasma-copolymerized to yield films containing both silicon and fluorine residues. The elemental composition of the formed polymer films depended on the composition of the starting mixture. The Si/C atomic ratio decreased with increasing TFM concentration, whereas the F/C ratio increased. The gas permeability of these composite membrane was measured. The plasma copolymerization methods are available for the preparation of the membranes for gas separation. In addition, the properties of the plasma polymerized films were studied by contact angle measurements and surface energy count.  
        关键词：Plasma polymerization;Hexamethydisiloxane;Tetrafluoromethane XPS;Contact angle;Gas separation membrane   
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        发布时间：2024-11-05
      • Wei Jun,Ji Zhimin,Liu Shuzheng
        Vol. 8, Issue 4, Pages: 235-239(1990)
        摘要：In the present study radioimmunoassay, fluorimetry and high performance liquid chromatography were used to determine neuropeptides and monoamine neurotransmitters in the rat brain after head irradiation with 10 Gy X-rays. The results showed that the immunoreactive (ir) L-Enk in the hypothalamus and irM-Enk in the pituitary decreased markedly,while the contents of NE, E and DA in the hypothalamus, 5-HIAA in the diecephalon and the 5-HIAA to 5-HT ratio increased significantly. The monoamines in the other cerebral area showed no significant changes. These results suggest that the hypothalamus is comparatively radiosensitive and neurochemical changes in it may have profound influence on the functions of the nervous and endocrine system.  
        关键词：Head irradiation;Monoamine neurotransmitters;Neuropeptides;Hypothalamus   
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        发布时间：2024-11-05
      • Hu Fumin,Cheng Song,Peng Peili
        Vol. 8, Issue 4, Pages: 240-243(1990)
        摘要：The radiation grafting of acrylonitrile onto polyethylene film by mutual irradiation method was described in this paper. The energy of activation for this system is 2.51 J. mol-1 calculated by Arrhenius equation. The functional polymer membranes containing amidoxime and imidozoline groups can be obtained by chemical reaction of AN/PE graft copolymer with hydroxyamine and ethylenediemine respectively. The flux and separction coefficient for both membranes in the process of pervaporation were compared.  
        关键词：Radiation graft;Polyethyhene;Acrylonitrile;Vinylamidoxime;Vinylimdozoline;Pervaporation   
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        发布时间：2024-11-05
      • Zhou Yingcai,Kan Xingwu,Gao Hei,Li Hua,Wang Xuying
        Vol. 8, Issue 4, Pages: 244-247(1990)
        摘要：The results which have obtained accorting to basic studies of irradiated crosslinking of PEG 20M were transplanted to pregaration of capillary column of PEG 20M The elementary crosslinking reactions of PEG 20M have been deduced from the determination of the molecular weight, IR, radiolytic products as well as gel dose and crosslinking G value. Accordingly, the good technical conditions of making capillary column of PEG 20M were found without any additives.  
        关键词：Polythylene glycol;Irradiated crosslinking;Immobilization;Capillary column   
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        发布时间：2024-11-05
      • Zhang Yulin,Nie Guanghong,Li Chengxun,Meng Xiansen
        Vol. 8, Issue 4, Pages: 248-250(1990)
        摘要：In this paper the insecticidal effects on Dermestes tessellatocollis adults and larvae using 60Co γ irradiation were reported, and the relation between the irradiation dose and effect was studied The results showed that absorbed dose within the range of 1-2.5×103 could effectively kill the adults and larvae of this moths,and the eggs and survival adults undergone irradiation lose the hatching and multiplication ability, respectively.  
        关键词：Leatheas;Dermestes tessellatocollis;Moth   
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        发布时间：2024-11-05
      • Xu Shaoqin,Wang Gongeng,Zhang Yulin,Nie Guang hong
        Vol. 8, Issue 4, Pages: 251-253,239(1990)
        摘要：has already proved that radiation with 60Co γ rays wita dose less than 20 kGy possesses a good effect of pesticide and disinfectant. Tensile strength, rate of elongation, strength of break-up, tearing strength and number of folding break-off ect have been taken asthe targets for inspecting the quality of hides after being radiated. The inspection proves that within a certain limit of dosage, radiation would not influence obviously the quality of the hides. Besides, it proves that in case a dosage of disinfectant or pesticide is used, the radiation would be able to kill reddish fur vermin.  
        关键词：Hide;γ radiation   
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        发布时间：2024-11-05
      • Zhang Hao,Le Ming,Chen Shijie,Jiang Yamei,Hu Yuexin,Fan Peifang,Li Xindi,Jin Weiqiao
        Vol. 8, Issue 4, Pages: 254-256(1990)
        摘要：Using a direct radioimmunoassay, we examined the changes of tissue kallikrein in rat urine and kidney after a single whole-body 8.5 Gy irradiation. The enzymatic activity of tissue kallikrein in rat urine was examined. It was found that the tissue kallikrein content in kidney and urine of irradiated group were significantly higher than control group at 6 h, and the enzymatic activity of tissue kallikrein in rat urine of irradiated group was significantly lower than control group at 72 h.  
        关键词：Tissue Kallikrein (TKK);Radioimmunoassay;Enzymatic Activity;γ-irradiation   
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        发布时间：2024-11-05
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