最新刊期
      期 2 ， 1992
      • Liu Rueizhi,Lei Shaoqiong,Li Ximing,Tang Tao,Chen Wenming,Fang Yuee,Dong Yongzhi,Han Ping,Feng Zhiguang,Zhao Gang,Zheng Li
        Vol. 10, Issue 2, Pages: 65-69(1992)
        摘要：The radiation polymerization technique was used for immobilization testosterone propionate into crosslinked network of polyhydroxyethyl methacrylate to prepare slowly released male sex hormone drug which is used for testicular prosthesis. The testicular prosthesis was transplanted into the scrotum of male rabbit whose testes was excised 2 months before the transplantation. Then the level of male sex hormone in serum was measured by radioimmunoassay once a week after transplantation. The results of measurement in a period of 6 months were shown that the testicular prosthesis has a stable release of male sex hormone. The testosterone level in serum of the castrated male rabbits rises markedly and finally stablizes at the level of 429± 36ng/100 ml after transplantation. Mircoscopic examination of biopsies taken from the tissues around the testicular prosthesis showed that tissue compatibility was revealed well.  
        关键词：Radiation polymerization;Testicular prosthesis;Testosterone propionate;Drug delayed release;Male sex hormone   
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        发布时间：2023-04-23
      • Lin Mingzhang,Jiang Huaiwei,Li Ximing,Liu Wansheng,Chen Wenming,Nishimoto Seiichi,Kagiya Tsutomu
        Vol. 10, Issue 2, Pages: 70-76(1992)
        摘要：The kinetics of gel formation in the radiation induced crosslinking reaction of isotactic polypropylene (i-PP) and its blend system was studied. The relationship between sol fraction (s) and irradiation dose (R) in radiation crosslinking of PP well agrees with assumption fracture density of polymer is proportional to Rβ, where β is a parameter depending on the structure of a polymer, and good linear relation between and Rβ of PP was obtained. In the case of PP/HDPE and PP/EPDM blends, based on the characteristics of phase structure and the interaction among the components, which were studied by scanning electronics microscope and dynamic viscoelastometer, the Rβ of i-PP blend can be modified as: Rβ=Σ xiRβi, xi and βi are weight fraction and β value of i component in blend respectively. Using this modified Rβ good relations between and Rβ of PP/HDPE or PP/EPDM blends in radiation crosslinking reaction were also obtained.  
        关键词：Radiation crosslinking;Polypropylene;Polyethylene;Ethylene-propylene-diene terpolymer;Polymer blend   
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        发布时间：2023-04-23
      • Qian Hongwei,Xu Rong,Yao Fenying
        Vol. 10, Issue 2, Pages: 77-80(1992)
        摘要：In this experiments, male of the ICR strain were used and were injected intraperitoneally with different dose of 125I. The rate of chromosomal abnormalities in mouse germ cells, and its changes with time were studied. The results showed that: (1) From 1 to 28 days after injection of 555 kBq of 125I, the rate of chromosomal abnormalities of germ cells reached a peak at 1 day. During that time, the abnormal rate in spermatogonias is 1.8%, which is equal to that in spermatocytes. After that, the abnormal percentages in those cells were quickly droped down. (2) The rates of chromosomal aberrations in spermatogonias in males treated with 0, 175, 555 and 1665 kBq of 125I at 1 day after injection were 0.14%, 0.45%, 1.80% and .2.65% respectively. Similarly, the chromosomal abnormal rates in spermatocytes were 0.13%, 0.60%, 1.80% and 2.20% accordingly. These results indicate 125I can induce a significant increase in the percentage of chromosomal aberrations of germ cells in male treated with 125I. The results also provide further evidence of the cytogenetic effects to mammalian germ cells of 125I.  
        关键词：125I;Germ cell;Spermatogonia;Spermatocyte   
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        发布时间：2023-04-23
      • Xu Yujie,Su Liaoyuan,Liu Keliang
        Vol. 10, Issue 2, Pages: 81-86(1992)
        摘要：The monocyte depleted peripheral blood mononuclear cells were saparated into B, CD4+ and CD8+ subpopulations by a Panning technique with McAb CD4 and CD8. The purity of the B, CD4+ and CD8+ subpopulations was 82.7%, 90.4%and 90.8% respectively, which was estimated by an indirect immunofluorescence technique. More than 92% of the three subpopulations were viable according to the trypan blue exclusion test. The modulation function of ConA-induced CD4+ and CD8+ cells and the effect of 10 Gy 60Co γ rays on them were investigated by the 3HTdR incorporation method. It demonstrated that the transformation of LPS-induced B lymphocytes was suppressed by the ConA-induced CD4+ and CD8+ cells. After irradiation, the suppressor activity of ConA-induced CD4+ and CD8+ cells did not decrease. It also showed that the suppressor activity of ConA-induced CD8+ cells was enhanced by the ConA-induced CD4+ cells significantly, and the suppressor activity of ConA-induced CD4+ cells was also enhanced by the ConA-induced CD8+ cells. After irradiation, the enhancement effects of the ConA-induced CD4+ and CD8+ cells disappeared.  
        关键词：Concanavalin A;Monoclonal antibody;Lymphocyte subpopulation;3HTdR;Radiation effect   
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        发布时间：2023-04-23
      • Wang Shicai,Zhou Maotang,Chen Jie,Guo Zhuojun
        Vol. 10, Issue 2, Pages: 87-91(1992)
        摘要：In a capacitively coupled discharge apparatus with external electrodes, γ-amonopropyltriethoxysilane (APTEOS) were polymerized and the effects of system pressure, discharge power and plasma gas on the polymerization rate were investigated. The polymer structure was studied by means of X ray diffration, IR spectroscopy and element analysis. Some polymer properties such as thermostability, hydrophobicity and surface energy were also studied.  
        关键词：Plasma polymerization;γ-aminopropyltriethoxysilane;Surface energy   
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        发布时间：2023-04-23
      • Lu Zhaoxin,Minoru Kumakura
        Vol. 10, Issue 2, Pages: 92-96(1992)
        摘要：Cationic-hydrophobic copolymer and anionic-hydrophobic copolymer was covered onto surface of paper by radiation polymerization. The paper covered with ionic copolymer was used as carrier of immobilizing Trichoderma reesei cells. Results showed that the cells were immobilized firmly on the carriers and not dislocated from the carriers by shaking. All of FPA of the cells immobilized with the carriers covered with cationic copolymer were higher than that of unimmobilized free cells. The carriers covered with anionic copolymer showed good effect on immobilization of the cells. The weight of immobilized cells increase as increasing the component of DEAEMA in poly (DEAEMA-ATMPT) or decreasing the component of AA in poly (AA-ATMPT). It also increase with the increase of water absorption in poly(DEAEMA-ATMPT)or decrease of water absorption in poly(AA-ATMPT). It shows tha static interatcion play an important role in the immobilization of cells with ionic copolymer materials.  
        关键词：Ionic copolymer;Immobilization;Trichoderma reesei;Radiation;Paper   
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        发布时间：2023-04-23
      • Wang Xianli,Wang Mingdong,Wang Bin,Sun Shuqing
        Vol. 10, Issue 2, Pages: 97-101(1992)
        摘要：After male mice irradiated by 2Gy X rays mated to normal virginal females superovulated with PMSG and HCG, pronuclei chromosome spreading of first-cleavage embryos were prepared and chromosomal aberrations of paternal pronuclei were observed, The results showed that the frequency of chromosomal aberrations was highest irradiated at spermatid stage among different stages of spermatogenesis. The sequency of radiosensitivity in spermatogenesis was as follows: spermatid> mature sperm> spermatocyte> spermatogonium and stem spermatogonium. The frequencies of paternal chromosomal aberrations resulted from irradiation at spermatids and mature sperms were significantly higher than that in control.The reciprocal translocations of stem spermatogonia induced by 2Gy X rays in those male mice were also examined in the preparations of diakinesis-metaphase Ⅰ. The freqency of reciprocal translocations were 0.0429 per cell and significantly higher than that in control. The proportion of unbalanced gametes, resulting in lethal embryos after fertilization, was 0.02145 to be predicted. At the same time, the dominant lethality induced by X rays in stem spermatogonia was measured, being 0.0371. The frequency of dead fetuses in irradiation group was about twice as in control. The regression analysis was found that the reciprocal translocations was markedly related to the dominant lethality.  
        关键词：X ray;Germ cell;Paternal pronucleus;Chromosomal aberration;Reciprocal translocation;Dominant lethality   
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        发布时间：2023-04-23
      • Zhang Xingyuan,Zhang Jixiang
        Vol. 10, Issue 2, Pages: 102-107(1992)
        摘要：The properties of molecular motion and trap of γirradiated poly¬(ethylene terephthalate) (PET) are studied by the method of TSC. 60Co γ-irradiation of a larger dose (500—5000 kGy) leads to the breaking of macromolecular chain and the increase of group dhensity of phenzyl with oxygen in PET. The α-peak of shortcircuit thermally stimulated current (corresponding to the glass transition temperature)shifts to lower temperature when irradiation dose increases. The mean depth of trap level, the initial density of charge carriers and maximum of ρ-peak current increase with the rise of irradiation dose. But γirradiation has not remarkable effect on the activation energy and the time constant of dipolar thermal relaxation for the main chain segmental motion in amorphous region of γ irradiated PET electrets.  
        关键词：γ Irradiation;Poly(ethylene terephthalate);Dipolar thermal relaxation;Trap depth;Thermally stimulated current   
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        发布时间：2023-04-23
      • Zhang Nan,Wu Jilan
        Vol. 10, Issue 2, Pages: 108-112(1992)
        摘要：Using multiple scavenger effects to investigate the radiolysis of cyclohexane has been reported. It was found that in the radiolysis of cyclohexane and 4-methyl-4-phenyl-2-pentanone, besides the excitation energy transfer, there is another important process happened, i. e., the capture of thermal hydrogen atoms. The rate constant of such process is obtained to be 2.5×109 Lmol-1s-1, and the yield of the thermal hydrogen atoms 1.5 is also obtained.  
        关键词：Cyclohexane;Radiolysis mechanism;Multiple scavenger effects   
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        发布时间：2023-04-23
      • Yang Lixi,Zheng Xiulong,Li Yunhua
        Vol. 10, Issue 2, Pages: 113-116(1992)
        摘要：Using the differential pusle polagraphy, the values of the hafe wave potential (E1/2) of the new radiosensitizer CM, Misonidazole MISO and Metronidazole were measured, and also compared under the same condition. The results showed that the magnitude of the E1/2 Was as follows; MISO>CM>Metronidazole. The data demonstrates that their reduction ability correlates well with their radiosensitization. Although the electronaffinic potency of CM and its radiosensitization in vitro are in the middle, CM has properties of tumor-affinity to a certain extent. low toxicity and high therapeutic index, and the preliminary clinical results indicate that CM is a low toxic and efficient radiosensitizer.  
        关键词：Radiosensitization;Polarography;Electronaffinity   
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        发布时间：2023-04-23
      • Wu Caixuan,Deng Zhiqun,Yu Qin,Zeng Daonan,Deng Guili
        Vol. 10, Issue 2, Pages: 117-120(1992)
        摘要：Leather products occupy an improtant place in the natiol economy. In order to prevent from mildewing of leather products in storage, transportation and sale, the packed shoes were irradiated with 60Co γ ray. Test materials are cattle, sheep and pig leather shoes. The results shows that: 1. There are 11 types of molds which make leather shoes mildewed: Oospora sp, Rhizopus oryzae Went and Grrelings, Aspergillus flavus Link, Aspergillus terreus thom, Monilia sp, Botrytis sp. Aspergillus niger V. Tiegh, Penicillum Lividum Westling, Penicillum Corylophilum Dierckx, Penicillum Cyaneum (B. and S.) Biourge and Penicillum Verrulosum Peyrone. 2. The three types of shoes packed with polyethylene film can be prevented from mildewing after irradiation at level of 12 kGy. 3. The irradiation at 30 kGy does not change the physical properties of the shoes. 4. The irradiated shoes packed with polyethylene film can prevent mildewing, but unpacked ones would be mildewed again.  
        关键词：Irradiation;Leather shoes;Mildewproof   
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        发布时间：2023-04-23
      • Xu Ming,Zheng Siying,Gao Jinsheng,Lu Zhongyan
        Vol. 10, Issue 2, Pages: 121-125(1992)
        摘要：The chromosome aberrations in sperm of mouse induced by various doses of 60Co γ rays irradiation and the dose-response relationship were investigated with technique of in vive fertilization and chromosome preparation in the first cleavage metaphase after fertilization. The chromosome aberrations in sperms and in bone marrow cells were compared. Male ICR mouse were irradiated with various dose 60Co γ rays. One week after exposure the male were mated with female and chromosome in the first cleavage metaphase were prepared. Chromosome aberrations were analysed and compared in light of radiosensitivity in sperms and marrow cells. The results shows that 60Co γ ray induced chromosome aberrations in sperms and the frequencies of chromosome aberrasions increased with the doses. The positive correlation was observed between them, which fitted well to linear regression equation Y=- 4.1636+ 8.3989 D. Frequencies of aberrate sperms and doses fitted well to the equation Y= -0.6215 + 5.331 D. The type of chromosome aderrations observed were mainly the chromosome-type aberration(93.2%). The fragments were predominant in chromosome-type aberration(79.8%). As for the chromosome aberration of sperm and bone marrow cells, the frequencies of total chromosome aberrations and translocations in sperms were obviously higher than that in bone marrow cells. Significant difference was found between them.  
        关键词：60Co γ Ray;Sperm chromosome aberration;Bone marrw chromosome   
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        发布时间：2023-04-23
      • Zhai Dongqing
        Vol. 10, Issue 2, Pages: 126-128(1992)
        摘要：In this paper, the effects of 2 MeV electron radiation on parameters hFE, toff and CT of silicon bipolar transistors is reported. The changes of these parameters depended largely on characteristic of defect level in transistors introducced by electron radiation. The measurement results indicate that reduction of minority carrier lifetime and effect of majority carrier removing induced by these defects level are direct reason for changes of hFE, toff and CT.  
        关键词：Bipolar transistors;Reduction of minority carrier lifetime;Effect of majority carrier removing   
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        发布时间：2023-04-23
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