最新刊期
      期 2 ， 1998
      • Deng Hai,Yang Jihuo
        Vol. 16, Issue 2, Pages: 65-69(1998)
        摘要：This paper reviews the classifications and basic mechanisms for radiation grafting monomers on a variety of backbone polymers, discusses several major influencing factors and methods for improving the grafting rate in the radiation-grafting system, and introduces recent research results including some novel additives and current applications of radiation grafting monomers on backbone polymers. The future research trends and applications of the methods of radiation grafting are delineated, and radiation grafting is thought as wide application perspective on radiation modification of polymers.  
        关键词：Modification of polymers;Radiation grafting;Advances of radiation-grafting research   
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        发布时间：2023-04-18
      • Jiang Yue,Lin Weizhen,Yao Side,Lin Nianyun
        Vol. 16, Issue 2, Pages: 70-74(1998)
        摘要：One-electron reduction potential () is one of the important parameters of electrophilic radioprotectors. In this work, one-electron reduction potentials of tea polyphenol components including EGCG, ECG, EGC and EC in aqueous solution at pH7 were determined to be -321 mV, -326 mV, -331 mV and -330 mV, respectively, using pulse radiolysis techniques. 2,6-dimethylbenzoquinone (DQ) was used as a reference compound.  
        关键词：Pulse radiolysis;Electron affinity;Radioprotector;One-electron reduction potential   
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        发布时间：2023-04-18
      • Lu Changyuan,Yao Side,Tong Yongpeng,Wang Wenfeng,Lin Weizhen,Rong Tingwen,Lin Nianyun
        Vol. 16, Issue 2, Pages: 75-79(1998)
        摘要：Using time-resolved laser photolysis techniques, it has been demonstrated that fullerol of C70,unlike some other fullerene derivatives, does not result in excited triplet state but in ionization via monophotonic process with 248 nm laser. The quantum yield of formation of hydrated electrons (Φe-) is determined at room temperature (about 15℃) in neutral aqueous solution with KI solution used as reference. The fullerol radical cation of C70 is observed for the first time by laser photolysis or oxidation of sulfate radical anion in aqueous solution.  
        关键词：Fullerol of C70;Monophotonic ionization;Radical;Quantum yield;Laser photolysis   
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        发布时间：2023-04-18
      • Zhang Huaming,Liu Guangyao,Chen Chuan,Lu Tao,Chen Tianxi,Liu Guoliang
        Vol. 16, Issue 2, Pages: 80-83(1998)
        摘要：The radiation effect of CB/EVA conductive composites was studied with different radiation doses. Experimental results showed that the negative temperature coefficient (NTC) effects of resistance of CB/EVA above the Tm were eliminated when the radiation dose was higher than 150kGy. The multiple stabilizers were added to the CB/EVA conductive composites and the conductive composite has the excellent heat-oxidation stabilization. The composites containing multiple stabilizers have good electrical reproducbility.  
        关键词：Radiation dose;Nagative temperature coeffiicient behaviour;Heat-oxidation stabilization   
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        发布时间：2023-04-18
      • Yang Huili,Liu Changhai,Xu Jun
        Vol. 16, Issue 2, Pages: 84-88(1998)
        摘要：Radiation effect of PP/EVA and PE/EVA blend with polyfunctional monomertriallyl isocyanuratc (TAIC) was studied. The results show that sensitized effect of TAIC on radiation crosslinking of PP/EVA is obvious, EVA has synergistic effect on gel formation of blend and improves the distribution of TAIC in the blend. Sensitized crosslinking also improves the compatibility interphase adhesion and mechanical properties of PP/EVA. But EVA of PE/EVA blend hadicaps reaction conversion of TAIC and screens TAIC.  
        关键词：Polypropylene/ethylene-vinylacetate copolymers;Polyethylene/ethylenevinglacetate copolymers;Polyfunctional monomer;Radiation effect   
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        发布时间：2023-04-18
      • Han Jianwei,Lu Chao,Yu Zengliang
        Vol. 16, Issue 2, Pages: 89-93(1998)
        摘要：Spark discharge was performed with different gas, and ions produced in the discharge were accelerated into tyrosine (Tyr) solution by the potential degradation in the vicinity of the cathode. The properties of UV and infrared absorption spectra for Tyr after discharge were studied. Using HPLC, the damage induced products after air discharge were analysed. It showed that the spark discharge can cause various damage on samples in solution, and the damage strongly depends on the character of the ions produced in the discharge.  
        关键词：Spark discharge;Ion implantation;Radiation damage;Tyrosine   
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        发布时间：2023-04-18
      • Ye Qiang,Ge Xuewu,Xu Xiangling,Zhang Zhicheng
        Vol. 16, Issue 2, Pages: 94-96,74(1998)
        摘要：The inverse emulsion polymerization of acrylamide has been studied with γ-ray initiation. Polyacrylamide with super high molecular weight over ten million (11×106) , which is very important in application as flocculant, is obtained. In this work, some mothods are taken to enhance the molecular weight as follows: (l) In order to prepare soluble polyacrylamide with super high molecular weight, the better conditions are: the emulsifier content is about 2% and the monomer concentration is about 20%~24% in the composition of monomer emulsion, and the absorbed dose is about 500~600Gy. (2) Initiating with high dose rate and polymerizing with low dose rate can not only enhance the molecular weight of product, but also curtail the polymerizing time. (3) Stopping radiation when the conversion gets to about 10% and post-polymerizing outside the radiation source until the conversion gets to 82% can obtain polyacrylamide with super high molecular weight, and shorten the irradiation time as well.  
        关键词：Super high molecular weight;Radiation-induced;Polyacrylamide;Inverse emulsion polymerization   
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        发布时间：2023-04-18
      • Guo Renfeng,Gong Yifen
        Vol. 16, Issue 2, Pages: 97-101(1998)
        摘要：In our experiments, Syrian hamaster embryo cells (SHE) exposed to 238Pu α particles acted as the target cells, the transformed frequency (TF) was determined by means of 10 days colony formation assay for appraising the promoting effect of recombinant human tumor necrosis factor α (rhTNF-α) . Different passage cells were achived by a series of passaging experiments, and their growth kinetics, anchorage independence growth nature and tumorigeniciey in nude mice were analysed. The results showed that (1) rhTNF-α could increased the TF of primary SHE cells previously irradiated by α 0.5Gy dose of α particles by a factor of two; (2) addition of rhTNF-α to subcultures of irradeated SHE cells permitted the continuous propagation of primary cells up to the both passages; (3) cells from 40th passage sustained growth under low serum condition; and (4) the monoclonal cells Tc, Td and cells of 40th passage were tested for their tumorigenicity in nude mice, and poorly differentiated fibrosarcoma were founed in two out of three nude mice in each group.  
        关键词：Tumor necrosis factor α;α particles;Cell transformation   
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        发布时间：2023-04-18
      • Liu Ning,Jin Jiannan,Xia Qingjie,Zhang Shuyuan
        Vol. 16, Issue 2, Pages: 102-105(1998)
        摘要：The radiotoxicity of α-emitter 211At for testes in NIH strain mice was investigated by a singular i.p. injection with 5.55×105 Bq of Na 211At, and the histopathological change of testicular cells was observed. Testes mass decreased rapidly at 6~30 days post-injection. Histopathological observation revealed that some cells of interstitial tissue are irradiated to death at 6 days, the semininferous tubules become empty at 30 days post-injection, and there is no spermatogenesis any more at this time. Additionally, the lethal dose (LD50) of 211At in the mice was investigated also by i.p injection and a LD50/7 of 8.14×104Bq/g was measured.  
        关键词：211At;Mice;Testis;Radiotoxicity;LD50   
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        发布时间：2023-04-18
      • Zhang Lianzhen,Chi Cuiping
        Vol. 16, Issue 2, Pages: 106-109(1998)
        摘要：Effects of DNA damage induced by γ-rays irradiation in human blood lymphocytes were studied using the single cell microgel electrophoresis (SCGE) technique. It was shown that γ-rays irradiation caused the increase of DNA migration length in the lymphocytes in the dose dependent manner. The DNA migration length of the lymphocytes increased with dosage (0~3.0Gy) .  
        关键词：Single cell microgel electrophoresis (SCGE);Human blood lymphocytes;γ-rays;DNA damage   
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        发布时间：2023-04-18
      • Wang Mingsuo,Chen Zheng,Huang Meiying,Huang Chaoqun,Jiang Ying,Su Liaoyuan
        Vol. 16, Issue 2, Pages: 110-112,101(1998)
        摘要：The antiradioactive effect of bee pollens on irradiated rats were studied. The results showed that bee pollens have better effects of antiradioactive damage, i.e. the counts of peripheral white blood cells (PWBC) and the activity of superoxide dismutase (SOD) of the irradiation group treated with bee pollens increased significantily comparing with the control groups (normal and single irradiation) , the levels of lipid peroxide (MDA Content and POV) of irradiation group treated with bee pollens decreased obviously comparing with the control groups. It is suggested that possible mechanism of antiradioactive capacity, namely, the activating for SOD to eradicate free radiacals and decline LPO levels. The experimental result has provied a scientific basis for clinical therapy of acute radiation sickness with bee pollens.  
        关键词：Bee pollens;Peripheral white blood cells (PWBC);Superoxide dismutase (SOD);Lipid peroxide (LPO)   
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        发布时间：2023-04-18
      • Zou Huawei,Su Liaoyuan,Tian Hailin
        Vol. 16, Issue 2, Pages: 113-116(1998)
        摘要：Purpose: In order to understand the mechanism of the stimulation effects of low dose radiation (LDR) , we observed the immune changes of T-lymphocyte subsets. Meteria and methods: Whole body of BALB/C bring-tumor mice were exposed to the doses of 5, 10,20 and 50cGy γ-rays. The changes of T-lymphocyte subsets in peripheral blood, spleen and tumor-infiltrating lymphocyte (TIL) were studied with flow cytometry (FCM) . Results: The ratio of remarkably increased in the peripheral blood and spleen (p<0.01) and the ratio of further decread in the TIL group of mice exposed 10cGy (p <0.05) . Conclution: We suggested that the immune functions were promoted by the stimulating effects of LDR of γ-rays in the bodies of the bring-tumor mice. CTL, expressing molecules, were concentrated in the tumor tissues and they carried out the killing function to the tumor cells.  
        关键词：Low dose radiation;Subset of T-lymphocyte;Tumor immunity   
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        发布时间：2023-04-18
      • Fan Zhangping,Zhu Bingchai,Lu Jiaben,Shen Xianrong,Lu Yongjie,Zhang Hongyuan,Pan Yan,He Ying
        Vol. 16, Issue 2, Pages: 117-121(1998)
        摘要：This paper reports the effect of total body irradiation with low dose radiation (LDR) on tumor inhibition and the dynamic changes of immunological indexes in Lewis lung cancer cell-inoculated mice in 20 days. Results show that tumor inhibitory rates in single and fractionated irradiation of 75mGy were 40% and 51% respectively, splenic NK cell activity was elevated in 1 to 4 days, CD4 and CD8 levels on T lymphocyte surface were up-regulated early to some extent, and the ratio of CD4/CD8 was risen post-irradiation. It suggests that under the experimental condition LDR might lead to growth inhibition of Lewis lung cancer cells and immunological hormesis in the tumor-bearing mice.  
        关键词：Low dose radiation (LDR);Tumor-bearing mice;Tumor inhibition;Immunological function;NK cells;T lymphocyte   
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        发布时间：2023-04-18
      • Liu Qingjie,Chen Deqing
        Vol. 16, Issue 2, Pages: 122-125(1998)
        摘要：The effects of low dose single whole-body irradiation on the specific hemolysin level in mice sera were studied in male Kunming strain mice, 18~22 g, aged 6~8 weeks. The mice were immunized intraperitoneally with sheep red blood cells (SRBC) after exposure to low dose Cobalt-60 γ-rays. The results showed that: (1) the levels of hemolysin in mice exposed to 2.5~10cGy were significantly higher than those of control (p <0.05 or p <0.01) , and the maximum response occurred at 10cGy, so the optimum stimulating dose is 10cGy; (2) irradiation of 10cGy caused that the peak level of specific hemolysin in sera appeared earlier and significantly higher than that of control; (3) the hormesis of specific hemolysin induced by 10 cGy γ-rays could last 1 to 2 weeks.  
        关键词：Humoral immune hormesis;Low dose γ-rays;Specific hemolysin   
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        发布时间：2023-04-18
      • Wang Xiangqing,Shao Chunlin,Yu Zengliang
        Vol. 16, Issue 2, Pages: 126-128(1998)
        摘要：Structure change of CH3COONa after 25keV N+ ion irradiation has been studied. Based on the results of high-detective FTIR spectra and high-sensitiveness ninhydrin reaction, it was proved that benzonitrile and α-Amino Acid could be produced in N+ ion irradiated CH3COONa sample by N+ ion implanation.  
        关键词：N+ ion implantation;CH3COONa;Mass deposition effect   
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        发布时间：2023-04-18
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