cPCN-Regulated SnO2 Composites Enables Perovskite Solar Cell with Efficiency Beyond 23％

Efficient electron transport layers(ETLs)not only play a crucial role in promoting carrier separation and electron extraction in perovskite solar cells(PSCs)but...     

Generation and Identification of the Number of Copies of Exogenous Genes and the T-DNA Insertion Site in SCN-Resistance Transformation Event ZHs1-2

Soybean cyst nematode (SCN, Heterodera glycines Ichinohe) causes an estimated economic loss of about USD 3 billion each year in soybean (Glycine max L.) production worldwide. Overexpression of resistance genes against SCN provides a powerful approach to develop SCN resistance cultivars in soybean. The clarification of molecular characterization in transformation events is a prerequisite for ecological risk assessment, food safety, and commercial release of genetically modified crops. Here, we generated transgenic events harboring the BCN (beet cyst nematode) resistance Hs1^pro−1 gene using the Agrobacterium-mediated method in soybean, evaluated their resistance to SCN infection, and clarified the molecular characterization of one of the transformation events. Five independent and stable inheritable transformation events were generated by an Agrobacterium-mediated transformation method. SCN resistance tests showed the average number of developed females per plant and female index (FI) in T4 ZHs1-1, ZHs1-2, ZHs1-3, ZHs1-4, and ZHs1-5 transformation events were significantly lower than that in the nontransgenic control. Among these, the ZHs1-2 transformation event had the lowest number of developed females per plant and FI. Southern hybridization showed the exogenous target Hs1^pro−1 gene was inserted in one copy and the Bar gene was inserted two copies in the ZHs1-2 transformation event. The exogenous T-DNA fragment was integrated in the reverse position of Chr02: 5351566–5231578 (mainly the Bar gene expression cassette) and in the forward position of Chr03: 17083358–17083400 (intact T-DNA, including Hs1^pro−1 and Bar gene expression cassette) using a whole genome sequencing method (WGS). The results of WGS method and Southern hybridization were consistent. All the functional elements of exogenous T-DNA fragments were verified by PCR using specific primer pairs in the T5 and T6 ZHs1-2 transformation events. These results demonstrated that the overexpression of Hs1^pro−1 gene enhanced SCN resistance, and provide an important reference for the biosafety assessment and the labeling detection in transformation event ZHs1-2.     

基于PLC控制技术的换热站系统设计

供暖系统在国内北方地区发挥着极为重要的作用,但传统换热站基本靠人工经验对供暖系统进行调节,很容易造成不必要的能源浪费.针对以上问题,以PLC作为控制器对换热站进行结构改善,能及时有效地对整个供暖系统做出自动调节,提高系统的工作效率.     

Three-dimensional graphene and its composite for gas sensors

As a two-dimensional (2D) material,graphene shows excellent advantages in the field of gas sensors due to its inherent large specific surface area and unique el...     

白藜芦醇糖苷类衍生物的设计与合成

以白藜芦醇及其类似物紫檀芪为原料,采用Schmidt成苷法、相转移催化法,分别与溴代糖和乙酰氨基糖反应,得紫檀芪乙酰葡萄糖苷和(E)-5,4'-二叔丁基二甲基硅基-3-(2"-乙酰氨基-3",4",6"-三乙酰葡萄糖二苯乙烯,其结构经红外光谱、核磁共振氢谱和质谱表征.     

混凝土墙材制品干燥收缩性能及有关问题的探讨

本文针对混凝土墙材制品干燥收缩性能的相关指标,以期在澄清基本概念和详细分析美国相关标准规定的基础上,探讨制定较为合理、统一、灵活的技术标准。     

Al4B2O9纳米棒改性制备优异综合性能的固体聚合物电解质

随着储能设备和电力驱动产品的激增,特别是电动汽车的大规模推广应用,全固态电池被认为是最有可能解决电动设备日益严峻的安全问题和高能量密度需求的策略之一.本文报道了一种Al4B2O9纳米棒改性的聚环氧乙烷(PEO)基固体聚合物电解质(ASPE),其具有高离子电导率、宽电化学窗口、良好的机械性能和阻燃性能.具体来说,因为Al...     

摩擦改进剂对改善燃油经济性的影响研究

采用四球机试验,考察了钼胺化合物、二烷基二硫代氨基甲酸钼、无灰型摩擦改进剂与摩擦因数的关系以及它们之间的复配作用。结果表明：摩擦改进剂（FM）降低摩擦因数的效果与其化学结构有关;加入量提高,摩擦因数的改善效果明显;不同化学结构的摩擦改进剂复配使用,可以减低整个温度区的摩擦因数。