共查询到19条相似文献,搜索用时 78 毫秒
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采用电子束辐射方法对铜绿微囊藻生长进行抑制和去除,通过呼吸速率及主要酶活性的变化,研究不同辐射剂量对藻细胞生理活动的影响.结果表明:电子束辐射使铜绿微囊藻受到严重迫害,呼吸速率及抗氧化酶活性在逆境胁迫条件下先增加后降低.3~5 kGy辐射迫害较为严重:藻细胞在辐射胁迫下引起抗氧化酶系统活性降低,体内活性氧产生和清除间的... 相似文献
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不同生长条件对铜绿微囊藻生长的影响 总被引:1,自引:0,他引:1
目前,愈演愈烈的水体富营养化现象给水处理工艺带来了十分严峻的考验。为了深刻理解水处理工艺中主要运行条件对铜绿微囊藻生长代谢的影响,试验以藻细胞个数和胞外分泌物浓度为指标,在长达30 d的试验周期内研究了藻细胞繁殖阶段中水温、光照和振动等参数与铜绿微囊藻生长代谢变化之间的相互联系。结果发现改变水温和水力学条件对藻细胞的生长代谢有着十分重要的影响。环境条件的改变(如提高水温和增加振动频率)虽然有利于藻细胞的灭活,但也可能导致胞外分泌物含量的激增,这对水处理效果有着严重负面影响。 相似文献
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十二烷基苯磺酸钠对铜绿微囊藻光合作用的影响 总被引:1,自引:0,他引:1
以各项表征光合作用的叶绿素荧光参数(Y、Y'、qP、qN、NPQ、φPSII、rETR)为观测指标,研究了不同质量浓度(0、0.05 mg/L、0.5 mg/L、5 mg/L、10 mg/L和20 mg/L)的十二烷基苯磺酸钠(LAS)对铜绿微囊藻光合作用的影响.结果表明,小于0.05 mg/L的LAS对该藻细胞生理生长不仅未产生胁迫作用,反而能提高PSII(光合反应中心)系统的光能捕获效率、光能转化效率和电子传递速率,从而促进光合作用的进行;0.5 mg/L~5 mg/L的LAS对该藻细胞的光合作用具有一定的促进作用,但程度较0.05 mg/L弱;10 mg/L的LAS对该藻的生理生长具有一定的胁迫作用,导致PSII系统的光能捕获效率、光能转化效率及电子传递速率均受影响,藻细胞无法进行正常的光合作用;高于20 mg/L的LAS对该藻具有剧烈毒性,严重胁迫其生理生长,致使光合作用完全终止. 相似文献
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二氧化氯杀灭水中铜绿微囊藻的影响因素 总被引:1,自引:0,他引:1
试验研究了二氧化氯与铜绿微囊藻的接触时间、二氧化氯投加量、藻初始浓度、pH值、有机物和氨氮含量对二氧化氯杀灭铜绿微囊藻效果的影响,考察了二氧化氯与混凝工艺的协同除藻效果。结果表明,二氧化氯与铜绿微囊藻最佳接触时间为10min。铜绿微囊藻杀灭率随二氧化氯投加量增大而提高,随pH值升高及有机物含量的增大而下降。由氯化铵形成的氨氮的存在对溶液的pH值有影响而使铜绿微囊藻杀灭率稍有提高。当叶绿素d初始浓度低于27.12μg/L时,二氧化氯杀藻率随藻初始浓度的升高而提高,但当叶绿素a初始浓度高于27.12μg/L时,杀藻率随藻初始浓度的升高而逐渐下降。二氧化氯与混凝具有协同除藻作用,当二氧化氯的投加量为0.5mg/L,聚合氯化铝10mg/L时,铜绿微囊藻杀灭率达到96.17%。 相似文献
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在2.5 L光生物反应器中考察了光强、通气量等对铜绿微囊藻生长的影响,确定了最佳生长条件. 在此条件下考察不同Fe3+浓度(0~500 mmol/L)对铜绿微囊藻的生长、叶绿素及微囊藻毒素(MC-LR)含量的影响,同时考察光照强度对铜绿微囊藻产毒素的影响. 实验结果表明,在低铁(Fe3+<0.1 mmol/L)、缺铁(Fe3+<0.01 mmol/L)及高铁(Fe3+>100 mmol/L)环境下,微囊藻生长、叶绿素及毒素合成均受到抑制. 生物量和叶绿素在Fe3+浓度为100 mmol/L时含量最高,毒素在Fe3+浓度为10 mmol/L、光强为30 mmol/(m2×s)时含量最大. 相似文献
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Chantara Thevy Ratnam Zahid Abdullah Hanafi Ismail 《Polymer-Plastics Technology and Engineering》2013,52(4):555-559
The effect of irradiation on a 50/50 ethylene vinyl acetate/epoxidized natural rubber blend was studied. The 50/50 ethylene vinyl acetate/epoxidized natural rubber blend was prepared by mixing in a Brabender Plasticoder at 120°C. The blend was then irradiated by using a 3.0 MeV electron beam machine at doses ranging from 20 to 100 kGy in air and room temperature. The dynamic mechanical properties, tensile properties, hardness, and gel fractions of the blends were measured. It was found that the tensile strength, modulus, and hardness of the blend increased with irradiation with a concomitant decline in elongation at break. Results on the gel fraction revealed that under the irradiation conditions employed, the EVA/ENR blend crosslinked by electron beam irradiation. The addition of TMPTA and Surlyn ionomer was found to be effective in increasing the degree of crosslinking. 相似文献
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In this study, the effects of ozone and electron beam radiation on color removal of dyes mixture were studied. According to the obtained results, the COD data denote that a first-irradiation process is a better one and the absorbency data denote that ozonation after irradiation will result in higher values of decolorization. Therefore, it can be said that a process that first applies an electron beam and then uses ozonation is better than the reverse process. Using a new approach for interpretation of the experimental decolorization results, it has been shown that the calculated dye removal percentages based on ozone consumption are near to experimental decolorization results. 相似文献
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阐述电子束辐照预硫化技术的设备结构和反应机理以及辐照剂量均匀性评价方法,探讨电子束辐照预硫化技术在半钢子午线轮胎胎体帘布加工中的应用。结果表明:辐照剂量对胎体帘布胶、帘布及其纤维原丝、轮胎性能有一定的影响;电子束辐照预硫化技术在轮胎生产中应用前景广阔,可以在优化工艺、提高生产效率和提升轮胎产品品质等方面发挥重要作用。近年来,国内大型轮胎企业在半钢子午线轮胎胎体帘布压延生产线新建或改造项目中基本配备了电子束辐照预硫化设备,但是目前亟待解决其故障率较高的问题。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(10-11):1699-1704
Abstract Butyl mastic is used in a number of industrial areas and in particular in the production of adhesives. The performance of this material can be improved by using ionizing radiation. In this work we showed that the shear forces in butyl mastic were modified when the material was exposed to radiation, and as a consequence the adhesion strength was increased. This was done by comparing the shear forces of butyl mastic before and after the exposure to ionizing radiation. The result was an increase of 440% of the average shear strength between the sealant and the substrate after the irradiation. This work can be considered as an important contribution to the field of butyl mastic. sealants and adhesives. 相似文献