最新刊期
      期 2 ， 1997
      • Yao Zhanhai,Rao Lei,Xu Jun
        Vol. 15, Issue 2, Pages: 65-70(1997)
        摘要：Polyvinyl acohol amidoxime chelate fiber (PVAAO) was synthesized bypreirradiation graft copolymerization and amidoximation. The chelating properties for Cu(Ⅱ),Pd(Ⅱ),Au(Ⅲ) and Hg(Ⅱ) ions have been studied. The experimental results showed that the irradiation dose influences the percentage of grafting,content of amidoxime group in the grafted product and its adsorption capacity. The adsorption capacity for metal ion Cu(Ⅱ) is 1.05mmol/g dry fiber.  
        关键词：Amidoxime chelate fiber;γ-irradiation;Graft;Metal ions;Adsorption   
        2
        |
        0
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371444 false
        发布时间：2023-04-23
      • Fu Zhonghua,Mao Xinggen,Xiong Wang,Tang Yuanmin
        Vol. 15, Issue 2, Pages: 71-74(1997)
        摘要：In this paper,the samples of PVDF/PEA blend with different crystallinity were made by melting and natural cooling or quenching in ice water. The samples were irradiated by electron beam at different dose. The result of DSC analysis shows that the melting temperatureTm and crystallization temperature Tc of the samples by natural cooling decrease with the increase of absorbed dose,but the enthalpy of fussion ΔHf, crystallinity Xc and the enthalpy of crystallization ΔHc first increase and then decrease slowly with the increase of absorbed dose. The DSC resultsfor second heating and cooling samples indicate that Tm, Xc, ΔHf tend todecrease,but the Tc and ΔHc do not change. It is foundthat the melting peaks split in DSC ofirradiated sample of PVDF/PEA blend by quenched in ice water.  
        关键词：Electron beam radiation;Polyvinylidene fluoride;Polyethyl acrylate;Blend;Melting;Crystallization   
        2
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371446 false
        发布时间：2023-04-23
      • Zhang Hongyu,Zhang Zhiyi,Wan Qian,Wang Dahui
        Vol. 15, Issue 2, Pages: 75-79(1997)
        摘要：In this paper,ESR techniques of spin trapping and spin counteraction were used to determine the relative yields of 1O2,O2·- and anion radical produced during photosensitization of hypocrellin B (HB) and its brominated products (5—Br—HB and 5,8—diBr—HB). It was found that monobromination did not increase the yield of 1O2 of HB and dibromination enhanced the yield of 1O2 about 20%,but decreased its ability of generating O2•- and anion radical through electron transfer at same time.  
        关键词：Hypocrellin B;Brominated HB;Photosensitization;ESR;Spin trapping;Spin counteraction   
        2
        |
        0
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371445 false
        发布时间：2023-04-23
      • Chen Panxun
        Vol. 15, Issue 2, Pages: 80-85(1997)
        摘要：Character change of operational amplifiers was compared in X-and γ-radiation enviroments. Dose enhancement effect of X — and γ-radiation was studied to operational amplifiers. Relative dose enhancement factors (RDEF) measured are about 3.4~12.4 in the experiment. SiO2/Si interface trapped hole charges and interfacestates are main failure model of operationalamplifiers in X-and γ-radiation enviroments.  
        关键词：Operational amplifier;X-ray;γ-ray;Radiation damage;Dose enhancement effect   
        2
        |
        1
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371443 false
        发布时间：2023-04-23
      • Wang Shilong,Yao Side,Wang Mei,Li Yijiu,Zhang Zhicheng,Zhang Manwei
        Vol. 15, Issue 2, Pages: 86-90,85(1997)
        摘要：The laser flash photolysis and pulse radiolysisof podophyllotoxin and its derivatives have been performed for the first time. The mechanism of photo-ionization has been confirmed and illustrated. Podophyllotoxin and its derivatives are high photosensitivity (UV) and can be readily photo-ionized to produce some transient species,which will be induced biological toxicities. In addition, they can react with hydrated electron,hydrogen radical and hydroxyl radical. This will give chemist some advice to synthesize new derivatives of podophyllotoxin in cancer treatment.  
        关键词：Podophyllotoxin and its derivatives;Pulse radiolysis;Laser flash photolysis;Anti-tumour activity   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371501 false
        发布时间：2023-04-23
      • Liu Zhanjun,Joseph Silverman
        Vol. 15, Issue 2, Pages: 91-95(1997)
        摘要：The effect of absorbed dose irradiated in vacuum and air on the crystallinity of drawn HDPE was studied. Experimental results show that up to 250kGy of absorbed dose when irradiated in vacuum,the crystallinity of drawn HDPE is decreased from about 75% to about 71%,and then the increase of absorbed dose until 1000kGy has no further effect in lowering thecrystallinity; when irradiated in air,an absorbed dose of 1000kGy has noeffect on the crystallinity of drawn HDPE. The effect of temperature of thermal treatment on the crystallinity of unirradiated drawn HDPE was alsoinvestigated. At first,the crystallinity is increased with the increase oftemperature of thermal treatment, at about 120℃,it reaches the maximumvalue, and then it is repidly lowered with the further increase of temperatureof thermal treatment. Based on the existence of a lot of voids and latticedefects inside the drawn HDPE,the above experimental results were explained.  
        关键词：γ-irradiation;High density polyethylene;Drawn;Thermal treatment;Crystallinity   
        2
        |
        0
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371500 false
        发布时间：2023-04-23
      • Yang Huili,Liu Changhai,Xu Jun
        Vol. 15, Issue 2, Pages: 96-99(1997)
        摘要：A new polyfunctional monomer (PFM),N,N-bis (4, 6-diallyloxytriazinyl—2—)1,10 — decanediamine was synthesized. Its structure was confirmed by IR spectroscopy and element analysis. Little smoke was observed when this PFM was kneaded with polypropylene (PP) on a two—roll mill,it didn't ooze out to the sheet sample surface after a long storage time,and the crosslinking of PP by γ-irradiation was notably sensitized.  
        关键词：Polyfunctional monomer;Synthesis;Radiation crosslinking;Polypropylene   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371557 false
        发布时间：2023-04-23
      • Guo Fangqing,Li Qun,Gu Ruiqi
        Vol. 15, Issue 2, Pages: 100-104(1997)
        摘要：With 10.75Gy X-ray irradiation,the chlorophyl contents in the first pair of leaves decreased in Bragg and supernodulated mutants. The decreased quantities in nts382 and nts246 were more than that in Bragg. There were a lot of leaf figuration and chlorophyl aberrations occuring in the leaves of Bragg and the mutants. With 10.75Gy treatment,the effects ofgrowth inhibition on nts382 and nts246 were more significant than that onBragg. The numbers of nodules per seedling in supernodulated mutants more severely decreased than that in Bragg when they were treatedat 10.75Gy or17.20Gy. With the numbers of nodules decreasing,the average weight of the nodule increased in times. These results mentioned above indicated that supernodulated mutants,nts382 and nts246, became more sensitive to radiation than Bragg.  
        关键词：Soybean;Supernodulated mtutants;X-radiation;Radiosensitivity   
        2
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371505 false
        发布时间：2023-04-23
      • Dong Xin,Song Jinfang,Zhang Qi,Huang Zhendong,Li Xingdi,Weng Shifang,Chen Yongming,Wang Hongfu
        Vol. 15, Issue 2, Pages: 105-108(1997)
        摘要：In order to find more effective radioprotective agents from cinnamic acid thioester derivatives, the structure ofP — hydroxycinnamic acid and sinapic acid into 4'— O —carbethoxy — 2— chlorocinnamic acid diethylaminoethylthiol estenrhydrochloride and 3, 4,5— trimethoxyphenylpropenoic acid diethylamino ethylthiol ester hydrochloride has been changed. The main step of synthesise of these agents involved the condensation of 4' — O —carbethoxy — phenylpropenoic acid chloride with diethylaminoethylthiol under base catalyst. The protective test on mice irradiated with 60Co γ-rays of 7.5~ 8.0Gy was shownthat the animal survival rate was enhanced by 30% within 30 days afterirradiation in comparision with the control group. The MS,IR and NMR spectra data of cinnamic acid thioester derivative have alsobeen reported. The ESR spectra of the compound was discussed.  
        关键词：Radioprotective agents;Cinnamic acid thioester derivative;Synthesis;Radioprotection   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371527 false
        发布时间：2023-04-23
      • Zhang Lianzhen,Deng Zhicheng,Wang Haiyan
        Vol. 15, Issue 2, Pages: 109-113(1997)
        摘要：This paper presents the results of study on 60Co γ-ray induced chromosome aberration in rabbits peripheral blood lymphocytes irradiated in partial and whole body and the aberration rate decrease with the time of post -exposure. The experiments included 5 groups, it was whole — body exposure group,partial— body exposure (abdomen and pelvic cavity) group,blood irradiation group in vitro and control group respectively. Radiation dose was 3.0Gy delivered at rate of 0.5Gy/min. The results show that it was no significant diffrences between whole body and in blood irradiation group. The chromosome aberration yield in whole body exposuregroup was higher than that in partial — body group and in the abdomen exposure group was higher than in that in the pelvic cavity irradiation; The chromosome aberration rate decreased with the time of post -exposure in partialand whole body by γ-ray irradiation.  
        关键词：Chromosome aberration;Decline of chromosome;γ-ray;Whole body exposure   
        2
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371551 false
        发布时间：2023-04-23
      • Kong Xiangrong,Su Liaoyuan,Liu Yongbiao,Zhao Yujie
        Vol. 15, Issue 2, Pages: 114-118(1997)
        摘要：The extracellular fluid was extracted from human peripheral blood lymphocytes cultured with PHA for 24 hours after 4cGy irradiation. The effects of subsequent higher radiation doses on lymphocyte subsets were studied by intermixing the extracellular fluid. The resultshowed that the radiation damage of CD8+ and CD4+ were decreasedsignificantly,and the strongest adaptive response occourred at the dose of 1.5Gy and 3.0Gy separately. It also found that CD8+ cells was more radiosensitive thanCD4+ cells and the adaptive response of CD8+ was more obvious than that of CD4+ at the dose of 1.5Gy.  
        关键词：Low dose irradiation;Extracellular fluid;Lymphocyte subsets;Adaptive response   
        2
        |
        0
        |
        4
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371565 false
        发布时间：2023-04-23
      • Su Xu,Wan Hong,Lui Shuzheng
        Vol. 15, Issue 2, Pages: 119-122(1997)
        摘要：Kunming mice were whole-body irradiated (WBI) with 75mGy and 2Gy X-rays. The expression of p53, Bcl-2 and Bax proteinswas analyzed with flow cytometry. It was found that the expression ofp53 protein showed,significantly decreased (p <0.005) 24 hours after WBI with 75mGy X-rays and significantly increased (p <0.005) after WBIwith 2 Gy X-rays. The ratio of Bcl-2/Bax was significantly increased(p <0.05) 24 hours after WBI with 75mGy X-rays and not significant changed after WBI with 2Gy. The change in expression of p53 and Bcl-2/Baxratio WBI with 75mGy and 2Gy X — rays may give partial explanation to the inhibitory effect of low dose radiation on thymocyte apoptosis. The results suggested that p53 and Bcl-2/Bax play an important role on apoptosis of thymocytes induced by ionizing radiation.  
        关键词：P53;Bcl-2;Bax;Apoptosis;Ionizing radiation;Flow cytometry(FCM)   
        2
        |
        0
        |
        6
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371569 false
        发布时间：2023-04-23
      • Fang Yue-e,Wang Huanting,Shi Tianyi,Zhang Jianxiang,Tang Jian,Xu Bin,Cai Keqin
        Vol. 15, Issue 2, Pages: 123-126,122(1997)
        摘要：In glow discharge, Chitosan membrane was modified by depositing plasmapolymer of petroleum ether onto chitosan membrane surface. The thermal stability, hydrophilicity and mechanical properties of the modified membranes were studied. The permeation rates and permeation coefficients of creatinine,urea and uric acid through the chitosan membrane and modified membranes were researched.  
        关键词：Chitosan membrane;Plasma modification;Permeability   
        2
        |
        0
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371587 false
        发布时间：2023-04-23
      • Jiang Yue,Yao Side,Lin Nianyun
        Vol. 15, Issue 2, Pages: 127-128(1997)
        摘要：Using a pulse radiolytic technique,it has been demonstrated that the interaction of oxidizing OH adducts of DNA with hydroxycinnamic acid derivatives proceeds via an electron transfer process with rate constant of (5~7)×108dm3 mol-1 s-1. Besides, the rate for fast repair of OH adducts of dAMP and DNA (ssDNA anddsDNA) are slower than the corresponding rate for the rest OH adducts of DNA constituents. The slower rate for oxidizing OH adduct of dAMP and DNA has indicated that repair of oxidizing OH adduct of dAMP may be the rate determining process during the interaction of hydroxycinnamic acid derivatives with OH adduct of DNA containing the varieties of OH adducts of DNA constituents.  
        关键词：Pulse radiolysis;OH adducts of DNA;Repair damage   
        2
        |
        0
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 36371588 false
        发布时间：2023-04-23
      0