Sulfur-Induced Resistance against Pseudomonas syringae pv. actinidiae via Triggering Salicylic Acid Signaling Pathway in Kiwifruit

Sulfur has been previously reported to modulate plant growth and exhibit significant anti-microbial activities. However, the mechanism underlying its diverse effects on plant pathogens has not been elucidated completely. The present study conducted the two-year field experiment of sulfur application to control kiwifruit canker from 2017 to 2018. For the first time, our study uncovered activation of plant disease resistance by salicylic acid after sulfur application in kiwifruit. The results indicated that when the sulfur concentration was 1.5–2.0 kg m⁻³, the induced effect of kiwifruit canker reached more than 70%. Meanwhile, a salicylic acid high lever was accompanied by the decline of jasmonic acid. Further analysis revealed the high expression of the defense gene, especially AcPR-1, which is a marker of the salicylic acid signaling pathway. Additionally, AcICS1, another critical gene of salicylic acid synthesis, was also highly expressed. All contributed to the synthesis of increasing salicylic acid content in kiwifruit leaves. Moreover, the first key lignin biosynthetic AcPAL gene was marked up-regulated. Thereafter, accumulation of lignin content in the kiwifruit stem and the higher deposition of lignin were visible in histochemical analysis. Moreover, the activity of the endochitinase activity of kiwifruit leaves increased significantly. We suggest that the sulfur-induced resistance against Pseudomonas syringae pv. actinidiae via salicylic activates systemic acquired resistance to enhance plant immune response in kiwifruit.     

智能化红外感应控制系统

文中介绍单片机HT48R06的结构和特点以及基于该单片机的智能化红外感应控制系统.这种感应控制系统可用于节水、自动门、红外报警、红外遥控等.     

半刚性基层沥青路面透层材料的合理选择与应用

沥青路面透层的合理选择与应用对于维持沥青路面整体强度及使用性能具有重要意义.文中探讨了沥青路面透层的概念、功能,对半刚性基层沥青路面透层材料的选择进行了说明,提出了透层沥青的技术要求与控制方法.     

海水淡化过程中硼的现场快速测定

针对传统的甲亚胺-H分光光度法,通过优化乙酸盐缓冲液pH缩短显色反应的时间,建立同一校准曲线下,快速测定海水和淡化产水中硼浓度的分析方法.方法中,当静置时间达20 min时,显色即可完全.通过实验确定,该分析方法不受海水高盐基体效应的影响.硼的浓度范围在0.10～2.0μg/mL之间时,校准曲线的线性系数达0.9999...     

添加剂对新型AgTiB2触头材料微结构和性能的影响

以乙二胺为溶剂采用微波溶剂热法合成铜铟镓硒(CIGS)粉体,研究了反应温度、表面活性剂对合成产物物相及形貌的影响.采用X射线衍射仪、扫描电镜及X射线能谱仪对产物的物相、形貌及组成进行表征.结果表明:在反应温度为230℃(反应时间为2 h)条件下可以获得物相单一,颗粒尺寸较小的CIGS粉体.在基准溶液中加入表面活性剂十二烷基硫酸钠(SDS)后对合成产物形貌有明显改善作用,粉体分散性较好,呈圆球状且粒径较小,为100～200 nm.     

Ag-4wt％TiB2复合材料复压复烧工艺

采用粉末冶金法制备了Ag-4％TiB2复合材料,研究了复压复烧工艺对Ag-4％TiB2复合材料组织和性能的影响.结果表明:复压复烧可改善第二相增强颗粒在基体银中的分布,使组织更加致密.随着保压时间的延长,Ag-4％TiB2复合材料的致密度、硬度和导电率呈先上升后下降的趋势;保压120s时,该复合材料的致密度、硬度和导电率达到最大值,分别为85％、115HB和50％IACS.与未复压复烧相比,Ag-4％TiB2复合材料的致密度、硬度和导电率分别提高了5.6％、6.48％和11.53％.     

Effect of Al<Subscript>2</Subscript>O<Subscript>3</Subscript> Content on Electrical Breakdown Properties of Al<Subscript>2</Subscript>O<Subscript>3</Subscript>/Cu Composite

Al₂O₃/Cu composites were prepared by external addition of Al₂O₃, and the effect of Al₂O₃ content on microstructure, density, hardness, electrical conductivity and vacuum electrical breakdown properties was studied. The results show that with increasing Al₂O₃ addition, the density of Al₂O₃/Cu composite significantly decreases, the hardness sharply increases and then slowly decreases, but the electrical conductivity invariably decreases. The vacuum breakdown test shows that with increasing Al₂O₃ addition, the breakdown strength first sharply increases and then decreases when the Al₂O₃ content exceeds 1.2 wt.%; the chopping current always exhibits a decreasing trend and the arc life first increases and then decreases. According to the morphology of arc erosion and analysis, the arc erosion resistance increases and then decreases sharply. In the range of experiments, the optimal arc erosion resistance of Al₂O₃/Cu composite can be obtained with the addition of 1.2 wt.% Al₂O₃.     

一种比相法瞬时测频接收机的工程实现

射频信号经限幅、放大、功分后输出两路信号,其中一路通过特定长度的射频线进行延迟,再经延迟信号与另一路信号同时送达鉴相器进行正交鉴相,并输出鉴相后的sin和cos两路模拟信号。这两路信号是输入信号相位的函数,与输入信号的频率相关,经A/D转换器转换为数字量送到FPGA,并由FPGA进行判断、计算和编码,同时输出对应的频率编码,以实现测频功能。     

柴油泄漏情况下生物酶缓蚀剂在循环水系统中的应用

油品泄漏导致循环冷却水中含有大量石油烃类物质,从而影响缓蚀剂的缓蚀效果。为寻求可应用于柴油泄漏情况下的生物酶缓蚀剂,向循环水中投加柴油以模拟油品泄漏,并配制不同浓度的生物酶制剂,分别考察其缓蚀效果,再根据单因素的实验结果,通过正交实验对3种生物酶进行复配。结果表明,柴油投加量为80 mg/L时,3种生物酶最优的复配方案为溶菌酶50 mg/L、脂肪酶10 mg/L、漆酶75 mg/L。复配的生物酶制剂可以在柴油投加量为80 mg/L的循环水中达到稳定的缓蚀效果,将碳钢的腐蚀速率控制在0.05 mm/a以下。     

SPAD值与鲜烟叶成熟度及烤后烟叶质量的关系

为探索快速、无损判断鲜烟叶成熟度的量化指标,以秦烟96为试验材料,应用叶绿素测定仪测定了各部位不同成熟度鲜烟叶SPAD值,并对相应烤后烟叶的经济性状、外观质量、化学成分、感官评吸质量进行了评价测定。结果表明,SPAD值能够较灵敏地区分烟叶黄绿面积10%~20%的差异,且与烟叶成熟度呈显著负相关关系,可较好地表示烟叶成熟度。综合烤后烟叶各项质量评价指标,下、中、上3个部位烟叶适宜成熟度对应的鲜烟叶SPAD值分别为8.6~11.4、17.9~18.6和13.2~20.3,SPAD值可作为成熟度的快速判定量化指标,用于指导烟叶适熟采收。