Fushe Yanjiu yu Fushe Gongyi Xuebao/Journal of Radiation Research and Radiation Processing

Photosensitive monomer 4,5-dimethyl-2-nitrobenzene methacrylate(DMNBMA) was grafted onto the surface of polyethylene(PE) film by pre-irradiation grafting method. The kinetics of the irradiation graft polymerization, such as the effects of absorbed dose, reaction time, reaction temperature, and monomer concentration on the degree of grafting were studied. FT-IR analysis was used to investigate the chemical structure of the grafted film and the results showed that DMNBMA was grafted onto PE film successfully. The grafted film was exposed under UV irradiation to initiate the photodecomposition reaction and the ester groups of the graft chains converted into carboxyl groups which made the hydrophobic surface become hydrophilic. The results of photodecomposition reaction demonstrated the PE film was photosensitized by grafting with 4,5-dimethyl-2-nitrobenzene methacrylate.

LI Wanxi

Journal of Radiation Research and Radiation Processing

Photosensitizing modification of polyethylene film by irradiation grafting with 4,5-dimethyl-2-nitrobenzene methacrylate

通过4,5-二甲基-2-硝基苯甲酸甲酯辐射接枝对聚乙烯薄膜进行光敏化改性

Based on the thermoluminescence(TL) assay, our study mainly investigated the specific method for identifying irradiated bee pollen samples. After extracting silicate minerals from samples, integrated intensity of the first TL curve was obtained(G1). Then, the extracted minerals were irradiated with γ-rays at dose of 1 k Gy, followed by the calculation of the integrated intensity out of the second TL curve(G2). The cutoff ratio of G1/G2 could be used to identify the irradiated samples: i.e. G1/G2≥0.10 meant samples were irradiated, and G1/G20.10 meant the samples were unirradiated. Therefore, this novel assay could be an effective method for identifying irradiated samples.

Sun Qizhon

Research on the identification of irradiated bee pollen food using thermoluminescence assay

利用热释光分析法研究辐照蜂花粉食品的识别

In order to investigate the biological characteristics changes of Streptococcus suis after being irradiated by 30 Gy, 50 Gy 12C6+ ion, Microbiological methods and Toxicology methods were used to detect hemolytic, antibiotic sensitivity of 18 kinds of antibiotics, biofilm formation ability, surface hydrophobic, and virulence of parent Streptococcus suis strain and mutant strain. Compared with the parent strains, the results showed that there was no significant difference in 30 Gy12 C6+ ion group in the aspect of hemolysis, antibiotic sensitivity, ability of biofilm formation, surface hydrophobicity and virulence(p≥0.05); the antibiotic sensitivity of Streptococcus to Trimesulf, Streptomycin, Trimethoprim, Gentamycin, Lincomycin in 50 Gy 12C6+ ion group was of significant difference(p≤0.05), but there was no significant difference in hemolytic, biological film forming ability, surface hydrophobicity and virulence(p≥0.05). In conclusion, there was no significant change in biological characteristics of Streptococcus suis after irradiation with 30 Gy 12C6+ ion, significant changes of the some antibiotic sensitivity were found in 50 Gy12C6+ ion irradiation group, but different mutations change differently in sensitivity to different antibiotics.

Lu Pin

The influence of some biological characteristics on streptococcus suis irradiated by carbon ion

某些生物学特性对碳离子辐照后猪链球菌的影响

The role of ATM in radio-resistant PCa cells caused by DAB2 IP knockdown was investigated in this study. The response of two PCa cell lines, PC3 sh Vector and PC3 sh DAB2 IP to γ-rays(0, 2, 4, 6, 8 Gy) alone or combined with 10 μmol/L KU55933, an ATM inhibitor, were measured by a colony formation assay. Quantitative real-time polymerase chain reaction(q RT-PCR) and western blot were used to determine the amount of ATM m RNA and ATM phosphorylation, respectively. The results showed that DAB2IP-knockdown cells(PC3 sh DAB2IP) exhibited increased clonogenic survival in response to IR compared with control cells(PC3 sh Vector) expressing an endogenous level of DAB2 IP. KU55933 significantly sensitized PC3 sh DAB2 IP cells to IR due to inhibition the ATM m RNA synthesis and ATM phosphorylation. It suggests that elevated ATM expression and activation observed in DAB2 IP deficient cells could be a key event in resulting in resistance to IR, and ATM inhibitor could be applied to improve the radio-sensitivity of PCa patients with DAB2 IP genetic defects.

Yang Che

Relationship between expression level of ATM and DAB2IP-knockdown induced radio-resistance in prostate cancer cells

ATM表达水平与DAB2IP敲低诱导的前列腺癌细胞放射抗性之间的关系

The aim is to investigate the changes of Connexin43(CX43) in mice serum after Co-60 γ irradiation and its practicability as a biodosimetry. The content of CX43 protein in mice serum was detected using surface plasmon resonance(SPR) technique. Western Blot method was also used as reference. Expression of Connexin43 is sensitive to γ radiation. Obvious up-regulation of CX43 expression was observed by γ-rays doses as low as 0.6 Gy. CX43 protein in mice serum first increased and then decreased with the increasing time after mice were irradiated at dose of 1.2 Gy. The highest level of CX43 appeared 3 h after irradiation. At this moment, the content of CX43 showed a linear correlation with the γ-rays doses in the range of 0-2.4 Gy, however, it began to reduce when the dose continued to increase. Western blot results showed that, the fluorescence intensity of the 1.2 Gy group is higher than that of the 0.6 Gy group, and both of them were significantly higher than that of the control group. Detection of Connexin43 protein in mice serum using SPR technique is expected to be a new biodosimetry.

Wang Shuaina

Study on mice serum CX43 as biodosimetry using surface plasmon resonance technique

表面等离子体共振技术用于小鼠血清CX43生物剂量测定的研究

This study aims at improving the irradiation processing capability of the 60Coγ-radiation source and ensuring the quality of irradiated food.Thus,different stacking thicknesses and irradiation box structures were selected as process parameters,and the absorbed dose and unevenness of irradiated foods with different densities were measured and analyzed.The results showed that the spatial dose field distribution was symmetric with the center point of the source plate,symmetrically distributed above and below the center,and that the absorbed dose at the center was the highest.With increasing distance from the center,the absorbed dose decreased,and unevenness was observed.The greater the stacking thicknesses of products with the same density,the higher was the unevenness.There was no obvious effect of stacking thickness on low-density products.Combined with the dose distribution of the empty field,when the unevenness was greater than 1.4,the main contradiction was transformed into the influence of stacking thickness,mainly because of the inhomogeneity of the outer and central surfaces.At this time,in order to increase the utilization rate ofγ-rays,the minimum dose and loading amount should be determined for the product with a density of less than 0.36 g/cm3,consider thinning instead of tiling for the product with a density of more than 0.36 g/cm3.For products with a density of 0.3 g/cm3,the spatial distribution of the irradiation field at a height of 5 cm from the bottom of the irradiation box was better than that of the punch.In addition,theγ-ray utilization of the irradiation box height and punch increased by 8.26%and 8.30%,respectively,compared with those for the original irradiation box.Therefore,the loading capacity and the structure of the irradiation box can be considered to reduce the minimum absorbed dose of food,thereby improving the energy utilization rate and production efficiency ofγ-rays during food irradiation.

蓝碧锋

张素平

唐智洪

蔡杰进

罗鹏宇

梁淑敏

Optimization of 60Coγirradiation process for food

60Coγ射线辐照食品工艺的优化

The fabrication of boron nitride nanosheets(BNNS)by the exfoliation of hexagonal boron nitride(h-BN)remains a challenging task in the field of two-dimensional material(TDM)preparation.Radiation-induced reduction-exfoliation(RIRE)is a new method of preparation of BNNS from h-BN.RIRE is achieved by the disruption of the interlayer interactions in a h-BN crystal by means of the volume expansion caused by the formation of Ni nanoparticles(NiNPs).NiNPs are formed via the radiation reduction of Ni2⁺ions intercalated between the h-BN crystal layers.As a result,sheet-like NiNP(approximately 20 nm)-bound BNNS(Ni/BNNS)in 200 nm squares,with an average thickness of less than 5 nm,was successfully peeled from h-BN under ambient temperature and pressure conditions in an alcohol/water medium.The prepared Ni/BNNS exhibited excellent catalytic performance,good structural stability,and viability for magnetic separation,which make Ni/BNNS recyclable.More notably,when the water/methanol dispersion containing Ni/BNNS was exposed to simulated sunlight irradiation,H2 evolution of 8404.3μmol/g Ni within 2 h was detected.Therefore,this work provides a new means for the preparation of BNNS by the efficient exfoliation of h-BN,introduces a one-step preparation method for novel TDM-supported nano-metal catalysts,and offeres new insight into the catalytic mechanism of visible-light catalysts.

姜志文

朱文刚

许国庆

徐项鉴非

汪谟贞

陈洪兵

黄玮

葛学武

林铭章

Preparation of nano-metal/boron nitride nanosheets composite catalyst by a radiation-induced reduction-exfoliation method

辐射诱导还原-剥离法制备纳米金属/氮化硼纳米片复合催化剂

This study aimed to improve the ability to detect the effects of radiation-associated genetic damage and establish a rapid and simple method for estimating biological dose.Radiation-sensitive genes were selected as biodosimeters from Pig-a,Gadd45α,and Hprt,based on their mRNA expression level changes.RT-qPCR was used to assay the relative expression level of the target genes in peripheral blood samples of healthy non-radiation(controlgroup)and radiation workers(exposed group)and their relative expression level average,fluctuation range and variation coefficient of the background expression were counted.Peripheral blood samples of healthy adults were irradiated with different X-ray doses of 0 Gy,0.10 Gy,0.25 Gy,0.50 Gy,1.00 Gy,2.00 Gy,and 5.00 Gy,respectively.6 h later,the relative expression of the target genes was examined using RT-qPCR and the binomial regression curve analysis was performed to analyze the quantitative effect relationship.The results showed that Piga and Gadd45αexpressions had small background level differences in the control group;Hprt had large background level differences and its variation coefficients were greater than 20%.The Hprt expression level in the control group was higher than that in the exposed group;Gadd45αand Pig-a expressions in the control group were lower than that in the exposed group(p<0.05).There was a dose-effect relationship between the Gadd45αand Pig-a expression levels and irradiation doses,indicating that the Pig-a and Gadd45αexpression level changes could be used as potential biodosimeters.

杨学琴

毛鑫玉

陈钰婷

李悦兰

张文

Investigating the use of radiation-sensitive genes Pig-a,Gadd45α,and Hprt as potential biodosimeters

探究辐射敏感基因Pig-a、Gadd45α和Hprt作为潜在生物剂量计的应用

Qian Haihong

Wang Hongbo

Fu Jiajia

Chen Taiqiu

Jiang Chunyan

Effects of electron beam irradiation grafting on anti-wrinkle/water and oil repellency of cotton fabric

电子束辐照接枝对棉织物抗皱/防水和防油性能的影响

Li Chunsong

Liao Ailian

Jiang Wenhua

Comparison study on different shielding calculation methods used in a cobalt source irradiation room

钴源辐照室不同屏蔽计算方法的比较研究

Publication Information	Publisher: Science China Press，Publishing cycle: ，Journal Type: journal，Open Access Journals: Yes
Basic data	Year of publication: 2019，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:
Average review cycle	16 weeks

Fushe Yanjiu yu Fushe Gongyi Xuebao/Journal of Radiation Research and Radiation Processing

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