最新刊期
      期 2 ， 1990
      • Li Shuzhong,Pei Yulan,He Zhongda,Liu Haiying
        Vol. 8, Issue 2, Pages: 65-69(1990)
        摘要：The physical properties of radiation crosslinked LDPE/EVA conductive composites have been investigated. The results show that conductivity of the composite increases with increasing conductive filler content. The tensile strength (Ts)and elongation(E) decrease with the increase of filler and LDPE content in polymer blends. The effect of temperature on Ts and E is obvious, and the effect of LDPE or EVA, filler and radiation on crystal melting point was investigated. was It was found that radiation crosslinked LDPE/EVA multiple phase system have good mechanical and conductivity properties.  
        关键词：Radiation crosslinked;Blend;LDPE;EVA;Mechanical property;Conductivity   
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        发布时间：2023-04-23
      • Zhang Xujia,Ha Hongfei,Wu Jilan
        Vol. 8, Issue 2, Pages: 70-74(1990)
        摘要：The γ radiation induced polymerization of styrene in the presence of ethanol was studied at dose rate of 5×1017 eV/ml min. The result showed that the radiation induced polymerization of styrene was sensitized by ethanol. The experimental results were in agreement with the theoretical calculation of WAS equationgotten Gfi=0.1, Ggi=4.0, α=0.18The mechanism of sensitization is proposed as proton transfer reaction:St• is the initial center for radical polymerization of styrene.  
        关键词：Styrene;Polymerization;Proton transfer   
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        发布时间：2023-04-23
      • Ha Hongfei,Gao Jinhui,Wu Jilan
        Vol. 8, Issue 2, Pages: 75-79(1990)
        摘要：It was found that the deactivation of Horse Radish Peroxidase(HRP) by gamma-ray was very severe at room temperature, but at low temperature(-78℃) it's deactivation could be controlled effectively.Radiation entrapping immobilization of HRP at low temperature was performed, but the leakage of immobilized HRP from gel made this method undesired.In this work, a new immobilization method of HRP vis pre-irradiation polymerization of acrylamide was developed. In this method, sample solution of acrylamide and proper ratio of crosslinking agent were being irradiated with bubbling oxygen continuously and then, take the sample out of radiation field, put some unirradiated HRP into the sample which was still not polymerized bubbling high pure nitrogen for about 15 minutes. Finally the sample was polymerized and at the same time the HRP would be entrapped in it.Some entrapping conditions were investigated. About 60% of HRP can be entrapped and the leakage of HRP gel was somewhat improved.  
        关键词：Horse Radish Peroxidase (HRP);Acrylamide;Bioactive molecules;Pre-irradiation polymerization;Immobilization   
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        发布时间：2023-04-23
      • Zhu Qingren,Fumitaka Horri
        Vol. 8, Issue 2, Pages: 80-85(1990)
        摘要：High-resolution solution 13C NMR spectra on radiation cross-linking in high density polyethylene by 60Co γ-rays has been observed. Two of the cross-linking new structural units identified in the present study for irradiated polyethylene are H- and Y-type, which formed during irradiation of polyethylene in vacuum both in the solid state and in the molten state.Other radiation induced structural changes in the samples have been also detected. It is show that the concentration of Y-type formed during irradiation in vacuum in the solid state is greater than that of H-type, while H-type formed during irradiation in vacuum in the molten state is greater than Y-type. The results of this study have led to new insights into mechanism of radiation induced linking of polyethylene, and provide means of characterization of irradiated polymer.  
        关键词：Radiation;induced cross-link;polyethylene;13C NMR;H-type linking   
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        发布时间：2023-04-23
      • Cao Enhua,Wang Jujun,Xin Shumin
        Vol. 8, Issue 2, Pages: 86-89(1990)
        摘要：ABSTRACY By measuring the survivals of HeLa cells, DNA strand breaks and the activity of O6-methylguanine DNA methyltransferase, the biological effect of γ-rays and MNNG on HeLa cells was investigated. It was observed that the combined exposure of γ-rays and MNNG increased the cell lethality, DNA strand breaks and the inactivation of the O6-methylguanine DNA methyltransferase. The decrease of the survival curve parameters D0, Dq shown a synergism between γ-radiation and MNNG.  
        关键词：γ-rays;N-methyl-N'-nitro-N-nitrosoguanidine;DNA strand breaks;O6-methylguanine DNA methyltransferase;HeLa cells   
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        发布时间：2023-04-23
      • Lu Yuan,Wang Darui,Han Denbao,Liu Deshen
        Vol. 8, Issue 2, Pages: 90-94(1990)
        摘要：Storaged pollen is easy to be destroyed by bacterium, moulds and insects. In order to solve this problem we tried to irradiate pollen with doses of 1.5 kGy and 2.5 kGy of γ-rays and then analyes its main nutritional compositions so to find out the effects of gamma-irradiation on amino acids, protein, carbohydrate, fat, vitamines etc.The results have been showed that the above doses gamma-irradiation doesn't notably influence the main nutritional compositions of rape pollen, even if they are storaged for three or six months at 4℃.  
        关键词：Gamma-irradiation;Rape pollen;Nutritional compositions   
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        发布时间：2023-04-23
      • Zhang Hongyuan,Wang Deheng,Taen Wuxun,Wen Quanfa,Cai Ping,Wang Lanjin,Zhao Shanyin,Hu yuexin,Li yong,Liu Tongshui
        Vol. 8, Issue 2, Pages: 95-99(1990)
        摘要：The radiactive nuclides were administered by gastric probe to rats with average activity 1.64, 1.48, 1.04, MBq/rat of 59Fe and 2.08, 2.12, 1.81 MBq/rat of 60Co respectively for young, adult and old groups. The cumulated internal doses to total body and R. M were calculated on the basis of radioactivity measurements on total body and organs. The results showed the chromosomal aberration yields of bone marrow cells and blood lymphocytes in experimental rats of various age-groups were higher than that of controls, the differences between the experimental and control groups were statistically significant at most dose points, moreover, the linear relationships existed between R. M cumulated doses and chromosome acentrics of bone marrow cells in old rats exposed to 59Fe and 60Co, the SCE incidences in lymphocytes of rats of various age-groups incorporated with 59Fe and 60Co did not greatly changed.  
        关键词：59Fe;60Co;Radiation-Cytogenetic effect;Chromosomal aberration;SCE   
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        发布时间：2023-04-23
      • Jiang Peiyun,Zhang Zhicheng,Wu Xiangyue,Zhang Manwei
        Vol. 8, Issue 2, Pages: 100-102(1990)
        摘要：An automatic dilatometer for radiation-induced polymerization has been introduced. It is simple in construction, convenient to handle and suitable to follow emulsion polymerization as well as bulk or solution polymerization at low. conversion.  
        关键词：Dilatometer;Radiation-induced polymerization   
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        发布时间：2023-04-23
      • Kang Xin,Fang Yunzhong,Xin Wenjiuan,Sun Chungpu
        Vol. 8, Issue 2, Pages: 103-106(1990)
        摘要：MAL-6(2, 2,6,6,-tetra-methyl-4-malaimide-piperidin-1-oxyl) was used as spin label in studying the effects of ionizing radiation on rat erythrocyte membrane protein. By this approach, It was found out: (1). 100-400 Gy irradiation in vitro gave no obvious effects on ESR spectra revealed by spin label-SH group in the erythrocyte membrane. (2). Whole-body irradiation with 8.5 Gy caused increase of w/s ratio for the erythrocyte membrane.It was suggested that the above-mentioned results might be attributed to the damage action of the endogeneous active oxygen species produced from imbalance between their generation and scavenging in erythrocyte or living body.  
        关键词：Spin label;SH group of membrane protein;Irradiation in vitro and in vivo   
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        发布时间：2023-04-23
      • Feng Jialin,Shao Songsheng,Lin Yaping,Liu Hongzhen,Zou Meijun
        Vol. 8, Issue 2, Pages: 107-110(1990)
        摘要：The human blood was irradiated in vitro by 0-100 10-2Gy. Then the lymphocytes were separated from the whole blood. The mitotic CHO cells fused with lymphocytes. This technique can be used to visualize damage to interphase chromosome aberrations after irradiation. The frequency of breaks produced in G1 phase of the lymphocytes is scord. The dose-response curve for chromosome fragments was found to be linear , r=0.99. The method was compared with conventional cytogenetic. The results presented that the G1-PCC technique is more rapidly and sensitively. But the G1 -PCC used technique of biological dosimetry has some questions which is discussed.  
        关键词：Premature condensation chromosome;Aberration;Break   
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        发布时间：2023-04-23
      • Zhang Linhua,Feng Lutian,Li Shuhua,Zhang Zicheng
        Vol. 8, Issue 2, Pages: 111-117(1990)
        摘要：In this paper, effect of ethylene glycol dimethyacrylate (EGDMA)on radiation reactions of random 1,2-polybutadilene (1, 2-PB)was researched. In order to get information on radiolytic changes in 1,2-PB, the Sol fraction, the converation of double bonds, the structure chang of the irradiated sample were measured by using IR and 1H-NMR techniques. The results show that random chain process of crosslinking in irradiation is not changed by the presence of EGDMA in 1,2-PB; its G(c. 1) and G(Ⅰ) Value increases with increasing of the ratio of EGDMA to 1,2-PB in the system, while its G(-V) and G(cy) deacreases with that. In presence paper, the mechanism of effect of EGDMA on radiation reactions of 1,2-PB was also discussed.  
        关键词：Random 1,2-PB;Radiation effect;Radiation crosslinking;Effect of EGDMA on irradiated 1,2-PB   
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        发布时间：2023-04-23
      • Li Xingdi,Chen Yongming,Wong Shifang,Wang Hongfu
        Vol. 8, Issue 2, Pages: 118-121(1990)
        摘要：The hematopoietic aplasia caused by irradiation was involved in injury of parenchyma cell and microenvironment. This paper reports the combined radiation protective effect of estradiol benzoate, which protects hematopoietic cells, and the Chinese medicine of qi jia dan, a kind of tonifying vital energy and eliminating the stagment prescription for improving microcirculation disturbantces. It showed that the survival rate of the estradiol benzoate-protected group, which was given 3 days before radiation increased by 26.7 percent compared with the untreated group. The chinese medicien administrated to the mice within 3 days after the exposure increased the survival rate by 23.4 percent compared with the control group. The survival rate of the group exposed to 7.5 Gy with combined therapy enhanced 33.4 percent more than the untreated (control)group. The result obtaind from dogs indicated the effect of combined therapy group was more better than single therapy group for relieving the symptoms and rerising of blood. The paper concluded that the combined therapy from both parenchyma and microenvironment is more helpful to accelerate the recovery of radiation damage.  
        关键词：Radiation injury;Radiation protection;Estradiol benzoate;Qi Jia Dan (Chinese medicine)   
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        发布时间：2023-04-23
      • Mi Fushun,Li Zheng,Shen yu,Hu Bi,Wang Rongxian,Li Meijia,Shi Peiji
        Vol. 8, Issue 2, Pages: 122-124,F4(1990)
        摘要：The radiosensitizing effect of non-nitro compound S-8712 on HeLa-S3 cell line was investigated, using cell colony forming assay in vitro. When the concentration of compound was 2 mmol/L, sensitizer enhancement ratio (SER) of hypoxic cells calculated according to the ratio of D0 and Dq was 1.04 and 1.26. When the concentration of S-8172 raised to 6 mmol/L SER was 1.35 and 1.25 respectively. It showed that the radiosensitizing effect of S-8712 was less then MISO at same concentratron. The effect of S-8712 was also observed on oxic HeLa-S3 cells. This compound demonstrated marked inhibition on repair of sublethal damage for aerobic cells.  
        关键词：Non-Nitro Compound;Hypoxic cell;Radiosensitizing effect   
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        发布时间：2023-04-23
      • Wu Zhongliang
        Vol. 8, Issue 2, Pages: 125-128(1990)
        摘要：This article mainly deals with the observation of the growth of Escherichia coli, which was used as an experimental model on a nutritional medium, which isused as a food-substitute and pretreated with a certain dosage of 60Co irradiation. In the meantime, an Automicrobio system can be used to observe the variations of enzymic metabolism in contrast with the growth and generation-transference of the same bacterial strain on a non-irradiated medium.It is shown that either in terms of microbic morphology, strain character, antigenic structure (Serum type) or of biochemical metabolic type. The various results are all in perfect conformity with those of the original strain. This demonstrates that though given a certain dosage of 60Co irradiation, the multi-nutritional medium does not affect the normal physiological metabolic function of the bacterial strain and induce mutagenesis in its further later generations.  
        关键词：Food irradiation;Biochemical metabolism;Escherichia Coli   
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        发布时间：2023-04-23
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