全球环境变化使植物体对增强UV-B辐射信号的感受和传导     

张满效  安黎哲  王勋陵 《兰州石化职业技术学院学报》2002,2(1):7-11

据国际上的最新研究成果 ,论述了在全球环境变化引起的UV -B辐射过程中 ,植物对UV -B信号的感受和传导机理 ,其中包括细胞中UV -B信号受体 ,各种信号分子 (诸如活性氧、水杨酸、茉莉酸、乙烯和一氧化氮等 )的级联放大传递以及对于基因表达活性的影响 ,提出了UV -B胁迫信号传递的信号分子级联模型 ,从而为有效防护环境变化引起的UV -B辐射增强对于植物体的伤害提供理论依据  相似文献   

微波辐射合成3-氨基-1,2,4-三氮唑     

沈阳  何冰晶 《台州学院学报》2007,29(6):52-54,58

在微波辐射条件下,以氨基胍重碳酸盐和甲酸为原料合成了3-氨基-1,2,4-三氮唑,反应速度比传统加热条件提高300倍,产率达到83.5%。优化后的最佳反应条件为微波输出功率为120 W,氨基胍重碳酸盐:甲酸摩尔比为1:1.25,溶剂无水乙醇为5mL,反应时间为60 s。  相似文献   

The Relationship between Attitudes, Knowledge, and Demographic Variables of High School Teachers Regarding Food Irradiation     

B.M. Thompson  K.P. Ribera  G.J. Wingenbach  T.A. Vestal 《Journal of Food Science Education》2007,6(2):24-29

ABSTRACT:  The purpose of this study was to use a validated instrument to determine the attitudes and knowledge of high school teachers regarding food irradiation, and to determine the correlations among their knowledge and attitudes and certain demographic variables. Knowledge and attitudes about food irradiation were measured in selected high school family and consumer sciences teachers ( n = 121) who taught Food and Nutrition, Food Science and Technology, and/or Food Production Management and Services, via a 24-item instrument with 6 factors. Results revealed these teachers held neutral to positive attitudes about the safety of irradiated foods, their perception of the risk of foodborne illness, and learning about food irradiation, and neutral to negative perceptions of their understanding of food irradiation and their competence to teach about it. These teachers had a moderate knowledge base regarding food irradiation. Teachers' attitudes regarding the safety of food irradiation were positively correlated with their perceived understanding of food irradiation, actual knowledge of it, and competence to teach about it. Their perceived understanding of food irradiation was positively correlated with competence to teach about it, knowledge, and attitudes toward the safety of food irradiation. The only demographic variable correlated with knowledge or attitudes was teachers' previous food irradiation educational experiences. These data suggest the importance of education for family and consumer sciences teachers concerning food irradiation.  相似文献   

微波合成半导体HgS纳米粒子   总被引：2，自引：3，他引：2  

廖学红 《黄冈师范学院学报》2001,21(3):48-51

在甲醛溶液中，以Hg(Ac)2和TAA为原材料，通过微波加热合成了HgS半导体纳米粒子，并用XRD、TEM、紫外光谱进行了表征。  相似文献   

辐照板鸭产生异味的初步研究   总被引：1，自引：0，他引：1  

李宗菊  陈宗道 《科技通报》1992,8(5):300-303

采用辐射贮存肉类,剂量较高时会产生辐射异味.研究表明:板鸭辐射味随剂量的增加而加强,当剂量超过5kGy时,即引起较强的辐射味.辐射味主要来源于板鸭肌肉蛋白,特别是其中的水溶性蛋白质部分;辐射味与羰基化合物、挥发性含硫化合物及胺等有关,其含量随剂量的加大而增加.辐射产生了两种新羰基化合物(R_f值分别为0.23和0.28)及一种挥发性胺——丙胺.  相似文献   

电子束辐照法在水处理中的应用     

吴代顺  于洋  张运生 《安阳工学院学报》2007,(4):32-35

介绍了电子束辐照机理,概述了电子束辐照降解有毒有害和难降解的有机污染物、去除重金属离子等方面在水处理中的研究和应用现状,最后对电子束辐照和其他的水处理工艺进行了比较,指出了其操作方便、安全的特点,并对其在水处理中的应用前景进行了展望.  相似文献   

Decolorization Kinetics of Sludge Protein Solution by ~（60）Coγ-Ray Irradiation/H_2O_2 Oxidation     

相玉琳  张卫江  郑浩 《天津大学学报(英文版)》2011,17(1):45-50

In order to carry out decolorization, sludge protein solution, a dark brown close to black solution from activated sludge, was subjected to ⁶⁰Co γ-ray irradiation in the presence of hydrogen peroxide. UV/Vis spectrophotometric method was used to investigate the effect of H2O2 on the coloration apparent kinetics and rate constants of sludge protein solution under γ-ray irradiation. In addition, the effects of irradiation dose, initial sludge protein solution concentration, and pH value on the decolorization efficiency of sludge protein solution were studied. Results showed that the decolorization apparent kinetics of sludge protein solution was a first-order reaction. The solution decolorization percentage increased with the increase of irradiation dose or the decrease of initial sludge protein solution concentration. The examination results of pH value showed that the sludge protein solution could be more efficiently decolorized in alkaline media than in acid media. Moreover, sensory evaluation and foamability analysis indicated that irradiated samples under H2O2 oxidation showed better sensory score and foamability.  相似文献   

海藻酸钠/钠化累托石共辐射接枝丙烯酸     

杨连利 《咸阳师范学院学报》2011,26(4):53-56

以⁶⁰Coγ为辐射源,在氮气保护下对海藻酸钠/钠化累托石（SA/Na⁺REC）复合物和丙烯酸（AA）进行共辐射制备海藻酸钠/钠化累托石接枝聚丙烯酸（SA/Na⁺REC-g-PAA）。利用IR、XRD及SEM对产品结构及形态进行分析。考察了辐射条件对产品接枝性的影响,结果表明,当Na⁺REC质量分数为2%,丙烯酸与SA/Na⁺REC质量配比为8,辐射总剂量为9.0kGy,甲醇与水的体积比为8:2时,产品接枝性最好其接枝率,接枝效率分别达130.8%、82.4%。SEM表明辐射引发可得到多孔疏松的产品。初步探讨了辐射接枝机理。  相似文献   

固态合成硬脂酸十八醇酯的研究     

李静  王捷  黄兴才 《许昌学院学报》2011,30(2):95-98

在无溶剂状态下,以十八醇和硬脂酸为原料,以对甲苯磺酸(PTSA)为催化剂,微波协助合成了硬脂酸十八醇酯.利用正交实验法探究了酯化反应的各种影响,其影响因素的大小依次为D>A>C>B;其反应的最优条件:醇酸物质的量比(A)为1∶1.2,催化剂用量(B)为0.2 g,微波辐射功率(C)为514 W,微波辐射时间(D)为40 m in,产率可达94.35%.  相似文献   

微波辐射相转移催化合成苯甲酸苄酯   总被引：2，自引：0，他引：2  

冯亚非  李先文 《天水师范学院学报》2004,24(5):34-35

在实验室条件下,采用微波辐射技术和相转移催化剂,以水为溶剂合成了苯甲酸苄酯。其最佳反应条件是:苯甲酸0.10mol,氯化苄0.20mol,相转移催化剂十六烷基三甲基溴化铵(HDTMAB)5mmol,微波功率800w,微波辐射时间10min,产率达到86.4%。  相似文献