共查询到16条相似文献,搜索用时 109 毫秒
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CO2激光辐射黄瓜种子对种子活力影响的研究 总被引:5,自引:1,他引:5
采用功率密度为898mw/cm^2的CO2激光对黄瓜子种子进行不同时间的照射处理,其结果表明,3s-7s均有不同程度的刺激效应,30s以上出现了不同程度的抑制作用和畸形芽,其中的90s组已达到了半致死剂量。 相似文献
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半导体激光辐照对花生种子活力的影响 总被引:1,自引:0,他引:1
采用350nw,810nm近红外光导体激光辐照花生干种子,经激光辐照后,种子胚根生长速度加快,胚根长度增加,侧根数目增加,种子出苗率提高。幼苗苗鲜重与根鲜重指标均高于对照组。实验证明,适当剂量的近红外半导体激光辐照可提高花生种子活力,促进幼苗生长。 相似文献
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CO2激光辐射提高蔬菜种子活力的研究 总被引:1,自引:0,他引:1
本文总结了CO2激光辐射提高蔬菜种子活力的研究成果,适量CO2激光辐射蔬菜种子可增强种子活力,提高幼苗素质,增加产量,促进早熟,加强生物机能,改善解剖结构,提出一些需要解决的问题和对其进行的初步研究。 相似文献
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CO2激光对西瓜种子最佳辐射剂量的筛选及其数学模拟 总被引:2,自引:0,他引:2
采用功率密度为898m w /cm 2 的CO2 激光对西瓜种子进行不同时间的辐射处理,筛选出了最佳刺激剂量,并应用多项式回归进行数学模拟,得到了比较理想的结论。 相似文献
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土地利用变化作为全球气候变化研究的重要内容之一,对土壤CO2的排放具有重要影响。岩溶区石漠化治理过程中植被恢复伴随着土地利用方式的转变,其对土壤CO2排放的影响有待进一步研究。基于控制性实验,以土壤、岩溶含水介质初始条件相同,仅土地利用方式不同的贵州普定沙湾模拟试验场为研究对象,通过1年的土壤CO2浓度和通量数据,研究岩溶区不同土地利用方式下土壤CO2的排放规律及其影响因素。结果表明:(1)土壤CO2的浓度和通量具有明显的季节变化规律,不同季节下的土壤CO2通量呈现昼夜变化规律,温度和降雨影响着土壤CO2的排放,前者可促进排放量,后者可抑制排放量,且不同土地利用方式受影响的程度不同;(2)耕作活动也会影响土壤CO2的排放,耕作使得土壤变得松散,加上岩溶区下伏基岩的溶蚀作用,增加了土壤CO2向含水层的扩散,导致春季耕地表现为负通量;(3)不同土地利用方式下土壤CO2的年排... 相似文献
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The reduction of ferricytochrome c by O2− and CO2− was studied in the pH range 6.6–9.2 and Arrhenius as well as Eyring parameters were derived from the rate constants and their temperature dependence. Ionic effects on the rate indicate that the redox process proceeds through a multiply-positively charged interaction site on cytochrome c. It is shown that the reaction with O2− and correspondingly with O2 of ferrocytochrome c) is by a factor of approx. 103 slower than warranted by factors such as redox potential. Evidence is adduced to support the view that this slowness is connected with the role of water in the interaction between O2−/O2 and ferri-ferrocytochrome c in the positively charged interaction site on cytochrome c in which water molecules are specifically involved in maintaining the local structure of cytochrome c and participate in the process of electron equivalent transfer. 相似文献
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全球CO2浓度变化与植物的化感作用 总被引:25,自引:0,他引:25
CO2浓度升高会使植物同化物在体内的含量和分配发生变化,这种变化会影响到植物的某些生理代谢功能,进而影响植物次生代谢物质的形成和分泌,就大气CO2浓度升高和温度增加将如何影响植物叶片及根系次生代谢物、化感物质、植物残体腐解以及化感作用进行了论述,同时针对目前研究现状和未来可持续农业的需要提出了大气CO2浓度变化下植物化感作用的优先研究领域。 相似文献
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The enzymatic hydrolyses of laser pretreated corn stover as a novel pretreatment method were examined to establish a simplified kinetic model for the complicated hydrolysis process. The time dependence of the total reducing sugars amount was closely related to the amounts of cellulosic materials and amounts of cellulase. The evaluated model fitted very well with the experimental data of enzymatic hydrolysis of laser pretreated corn stover under different conditions, including cellulase loading, nature of substrate, substrate loading in the reaction medium. The results indicated that the complex kinetics of cellulase enzymatic saccharification could be assessed with the fractal kinetic model. The cellulase enzymatic reaction process was effectively predicted and controlled with the kinetic model. The result showed that the model could effectively reflect dynamic process of enzyme hydrolysis. 相似文献