最新刊期
      期 3 ， 2007
      • SUN Dakuan
        Vol. 25, Issue 3, Pages: 129-132(2007)
        摘要：Consisting of a matrix phase of epoxy resin and reinforcement phase of high performance synthetic fiber, advanced composites have a number of engineering merits, such as high specific strength and specific modulus, light weight, fatigue resistance, corrosion resistance and dimensional stability, etc. Advanced composites have been applied in aerospace/aircraft industry, military industry, high pressure vessels, automobile industry and sports apparatus. Nowadays, advanced composites are produced by electron beam curing, an environment-friendly technology with greater safety and energy efficiency than conventional curing techniques. This paper gives a review on progresses of electron beam cured advanced composites.  
        关键词：Advanced composites;Thermal curing;Electron beam curing;Epoxy resin;Carbon fiber   
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        发布时间：2023-03-30
      • LI Zhenzhong,HE Wei,WANG Yuan,GUO Hongjun
        Vol. 25, Issue 3, Pages: 133-136(2007)
        摘要：Crosslinked ethylene-vinyl acetate copolymer/montmorillonite (EVA/MMT) nano-composite was prepared by UV irradiation. Effect of MMT on gel content of crosslinked EVA was analyzed. Other factors, such as time, temperature and atmosphere of the irradiation and thickness of the samples were studied. The results show that MMT could promote the crosslinking reaction, with the optimal conditions of 100℃ irradiation of 2 min, where the gel content could be 95%. Irradiation atmosphere and samples thickness affected the gel content notably at beginning of the irradiation, but they became less effective on the gel content after 2 min of irradiation.  
        关键词：Ethylene-vinyl acetate copolymer;Montmorillonite;Nano-composite;UV irradiation;Photo- crosslinking   
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        发布时间：2023-03-30
      • CHENG Guojun,CHEN Shuiping,WU Guozhong,LIN Baofeng,ZHONG Lei
        Vol. 25, Issue 3, Pages: 137-140(2007)
        摘要：Low molecular weight chitosan, product of γ-ray degradation, was modified by introducing glycidyl trimethyl ammonium chloride group and its antibacterial property was tested against different bacteria. The structure of chitosan and chitosan quaternary ammonium salt are characterized by FT-IR and 13C NMR. The results showed that the degree of substitution of the quaternary ammonium salt of chitosan with γ-ray irradiation was higher than original and its antibacterial effect to Escherichia coli and Staphylococcus aureate was also improved obviously, and molecular structure of chitosan wasn’t destroyed by γ-ray.  
        关键词：Chitosan;Radiation degradation;Chitosan quaternary ammonium salt;Antibacterial property   
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        发布时间：2023-03-30
      • YANG Gesheng,WEI Mengyuan,SHAO Huili,HU Xuechao
        Vol. 25, Issue 3, Pages: 141-145(2007)
        摘要：Bamboo cellulose pulp was irradiated in air by 60Co γ-rays. Effects of γ-ray irradiation on the molecular weight and its distribution of bamboo cellulose were investigated by viscosimetry and gel permeation chromatography. The G(s) value was estimated at 0.94μmol•J-1. The results showed that molecular weight of irradiated bamboo cellulose decreased and the molecular weight distribution narrowed with increasing dose.  
        关键词：Bamboo cellulose;Irradiation;Molecular weight;Molecular weight distribution;G(s) value   
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        发布时间：2023-03-30
      • YANG Qiang
        Vol. 25, Issue 3, Pages: 146-150(2007)
        摘要：The effects of radiation degradation on the properties and structure of various polysulfone under various irradiations, such as electronic beam irradiation, γ-irradiation and heavy ion irradiation have been reviewed and discussed in this paper. It has been shown that the previous studies are mainly concerned with degradation mechanism, the kinds of gas products, radiation chemical yields of degraded polysulfone and the relationship between properties and constructure of irradiated polysulfone. However the basic studies were insufficient to estimate the applied lifetime of polysulfones under irradiation situation. And the achievements are helpful for understanding the degradation behavior of various polysulfones under irradiation.  
        关键词：Polysulfone;Radiation degradation   
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        发布时间：2023-03-30
      • HOU Xinggang,LIU Andong
        Vol. 25, Issue 3, Pages: 151-155(2007)
        摘要：TiO2 films immerging in PdCl2 solution with [PdCl2] concentration at 10-5, 10-4, 10-3, 10-2 and 10-1 mol/L respectively were irradiated by electron beam in order to deposit nano-cluster noble metal Pd. The irradiated films were characterized by XRD, XPS, FMSEM and UV-visible spectrometry. The results show that the Pd clusters with fcc crystal structure were 20-50 nm in diameter on the surface of TiO2 films. Red shift was found in the absorption spectrum of modified Pd/TiO2 films. The photocatalytic capability of the films were tested by degradation of methyl orange (MO) in aqueous solutions under both UV and visible light illumination. The photocatalytic experiments showed that the photocatalytic ability of Pd/TiO2 under both UV and visible light irradiation could be improved dramatically.  
        关键词：Electron beam irradiation;Pd/TiO2 films;Photocatalytic   
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        发布时间：2023-03-30
      • SUN Yuan,LIANG Hongjing,DENG Xinhua,XU Zhicheng,BIAN Dongcai,ZHOU Xiaofeng,ZHANG Tao
        Vol. 25, Issue 3, Pages: 156-160(2007)
        摘要：In this study, the quantity of the superoxide radicals created by O2 plasma activation was confirmed by a new method-the 2,2,6,6-Tetramethyl-1-piperidinyloxyl radical (TEMPO) method and the effects of various conditions on radicals concentration were investigated. Under the conditions at which the radicals have optimal concentration, polyurethane (PU) film was treated by plasma to graft with Acrylic acid (AA) in order to testify the feasibility and dependability of the TEMPO method. In addition, the influences of react conditions on grafting rate were discuss, the acrylic acid grafted on the surfaces was characterized by Scanning electron microscopy (SEM). At 600W, 180s the concentration of the radicals high, the grafting rate is high correspondingly. The results suggest that the TEMPO method is an effective method to determine the concentration of superoxide radicals.  
        关键词：2;2;6;6-Tetramethyl-1-piperidinyloxyl radical;Plasma;Graft copolymer;Polyurethanes;Acrylic acid;Radicals   
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        发布时间：2023-03-30
      • HAO Shumei,ZHANG Zhaoxia,ZHU Hongping,ZHAO Hongwei,GE Min,WANG Wenfeng,YAO Side
        Vol. 25, Issue 3, Pages: 161-165(2007)
        摘要：The photooxidation damage of Lysozyme induced by duroquinone was studied by lysozyme activity analysis and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). It is suggested that the mechanisms and products of oxidative damage were relative to the concentration of duroquinone, the time of irradiation and the ambience. The type I process was considered in nitrogen saturated solution, whereas both type I and type II were involved in under aerobic atmosphere and type II was the dominant process. The study also indicates that antioxidants such as hydroxycinnamic acid derivatives can reduce the damage of lysozyme effectively.  
        关键词：Lysozyme activity;Duroquinone;Photooxidation;Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE);Antioxidant   
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        发布时间：2023-03-30
      • CHEN Xiaoming,TAN Bisheng,ZHANG Jianguo,ZHENG Chun,LUO Juan,SUN Ying,CHU Shijin,REN Zhenglong
        Vol. 25, Issue 3, Pages: 166-170(2007)
        摘要：In order to investigate the neutron radiation sterilizing effect and influence factors including dose, dose rate, temperature and spore state, the Bacillus subtilis var. niger. spore were irradiated by the fast neutron radiation produced from Chinese Fast Burst Reactor II. The plate-count results indicate that the D10 value is 384.6Gy with the neutron radiation dose rate of 7.4Gy/min and the correlation between the dose and logarithm of survivors meets the function y=-0.0026x+10.462. When neutron dose kept 800Gy, the correlation between the dose rate and logarithm of survivors meets the function y=7.7414x-0.0834; spore livability declines under a high radiation temperature. The spore livability order is spore strip > spore powder > spore solution at the same neutron radiation. The conclusion can be made that neutron radiation has a higher sterilization effect than gamma ray and electron beam.  
        关键词：Bacillus subtilis var. niger;Neutron radiation;Radiation sterilizing;Dose rate;Radiation temperature   
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        发布时间：2023-03-30
      • XU Naiyu,ZHANG Suping,NIE Jihua,DING Jiansong,TONG Jian
        Vol. 25, Issue 3, Pages: 171-174(2007)
        摘要：In this paper the different protein expression of BALF in rats inhaled radon was analyzed by use of two-dimensional electrophoresis (2-DE). Male Wistar rats were exposed to radon with the cumulative dose up to 200 working level month (WLM), then the bronchoalveolar lavage fluid (BALF) was collected and the total proteins were extracted. 2-DE was employed to isolate the total proteins of BALF. The gels were stained with silver and differential protein expressions were analyzed with Image Master 2D Platinum software. The total protein spots in the gels of the control and radon-inhaled rats were 654 and 554 respectively, containing 48 differential protein spots in which 23 expressed and obviously increased in the control group and 25 expressed and obviously increased in rats radon-inhaled group. The results indicate that the protein expression of BALF between rats radon-inhaled and the control are different to some extent.  
        关键词：Two-dimensional electrophoresis (2-DE);Radon;Bronchoalveolar lavage fluid (BALF);Proteome   
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        发布时间：2023-03-30
      • LIU Bing,ZHANG Hong,GAO Qingxiang,LUO Xiaohong,XIE Yi,HAO Jifang,DUAN Xin,ZHOU Qingming,ZHOU Guangming
        Vol. 25, Issue 3, Pages: 175-179(2007)
        摘要：The work is to investigate effect of AdCMV-p53 gene transfer on the radiosensitivity of tumor cells. HepG2 (wtp53), Hela (wtp53, low level wtp53 expression) and HT-29 (mtp53, mtp53 over-expression) cells exposed to 0, 0.25, 0.5, 1.0, 1.5 and 2.0Gy were infected with AdCMV-GFP, a replication deficient recombinant adenoviral vector containing a CMV promoter and green fluorescent protein, or AdCMV-p53, a replication deficient recombinant adenoviral vector containing a CMV promoter and carrying human wild-type p53 gene. Survival fraction of the cells was determined by clonogenic assay. Survival curves were generated by linear quadratic model. The results showed that AdCMV-p53 infection could significantly promote the radiosensitivity of tumor cells. There is a relationship between the effect of AdCMV-p53 infection and the cellular intrinsic p53 status.  
        关键词：p53;Irradiation;Adenovirus vector;Tumor cell;Radiosensitivity   
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        发布时间：2023-03-30
      • ZHANG Lei,ZHOU Zhou,ZHANG Guangbin,YU Zhengping
        Vol. 25, Issue 3, Pages: 180-184(2007)
        摘要：In order to explore the effects of microwave exposure on GLP-1 and its receptor, the relationship between the changes of GLP-1 and its receptor and learning and memory injury induced by microwave exposure has been studied in this paper. Morris water maze was used to evaluate learning and memory ability of rats. The changes of the plasma GLP-1 level were measured by ELISA assay. Alteration of the GLP-1R mRNA expression in rat hippocampus was determined by RT-PCR and Apoptosis was detected by TUNEL. Our study showed that microwave exposure injured the learning and memory abilities of rats meanwhile plasma GLP-1 level was decreased and GLP-1R expression in hippocampus was down-regulated, which can be protected by pretreatment with GLP-1. Alterations in GLP-1 and GLP-1R are, at least partially, responsible for the microwave exposure induced learning and memory dysfunction and neuronal injury. These data provide some new clues to investigate the mechanisms of microwave exposure induced neuronal injury and develop clinical approaches for treatment of microwave exposure induced injury. It can provide some new ideals for investigation of related mechanism and development of clinical treatment under exposured microwave irradiation.  
        关键词：Microwave exposure;GLP-1;GLP-1R;Hippocampus;Learning and memory   
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        发布时间：2023-03-30
      • TU Yu,WANG Lili,ZHOU Juying,CUI Fengmei,QIN Songbing,XU Xiaoting
        Vol. 25, Issue 3, Pages: 185-188(2007)
        摘要：The work is to study the expression of NSE and S-100 protein in SD rat brain tissue irradiated by 6MeV electron beam. The whole brain of the Sprague-Dawley rats were irradiated with single dose of 10Gy, 20Gy and 30Gy by 6MeV electron. Immunohistochemical method was used to measure the contents of S-100 and NSE in brain tissue. One-ANOVA was used for analysis. The expression of S-100 and NSE after whole brain irradiation was time-dependent. Compared with that of control group, there was an increase of expression of S-100 D7 after irradiation during the observed time (p<0.05). On the contrary, there was a decrease of NSE 24h after radiation, disappearing nearly at D30 (p<0.05). The indexes above were changed with the different dose levels at 7d after radiation. Radiation can induce the expression of S-100, as well as inhibit the expression of NSE on radiation-induced acute brain injury. The changes of the expression of S-100 and NSE on the brain can act as indexes of acute brain injury induced by radiation.  
        关键词：Radiation effects;Brain injuries;Neuro-specific enolase (NSE);S-100 protein   
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        发布时间：2023-03-30
      • DIAO Ruiying,SONG Liangwen,WANG Shaoxia,LI Ming,XU Xinping
        Vol. 25, Issue 3, Pages: 189-192(2007)
        摘要：To investigate the role of TGF-β1 on the early lung remodeling after radiation pulmonary injury. The dose-effect of human lung fibroblast proliferation promoted by serum after radiated rat was observed by MTT colorimetric methods. ELISA was used to observe the contents of TGF-β1 in serum as well as the expression of collagen IV and MMP-9 in HLF stimulated by serum after radiated rat. The level of TGF-β1 in rat serum increased from 2 to 4 weeks after irradiation. HLF proliferation was significantly promoted by the serum of irradiated rat at a dose of 10% in the medium. The serum of irradiated rat could not only promote HLF proliferation, but also increase the expressions of collagen IV and MMP-9 in HLF. TGF-β1 plays an important role in the proliferation of HLF and the expressions of collagen IV and MMP-9 in HLF, and is involved in the process of lung remodeling after radiation pulmonary injury.  
        关键词：TGF-β1;MMP-9;Collagen type IV;Pulmonary remodeling;Fibroblast   
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        发布时间：2023-03-30
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