摘要：MicroRNAs(miRNAs)are endogenous small non-coding RNAs that play an important role in post-transcriptional gene regulation in plants and animals by targeting messenger RNAs(mRNAs)for cleavage or repressing translation of specific *** first miRNA identified in plants,miRNA156(miR156),targets the SQUAMOSA promoter-binding protein-like(SPL)transcription factors,which play critical roles in plant phase transition,flower and plant architecture,and fruit *** identified multiple copies of MIR156 and SPL in the rice,Brachypodium,sorghum,maize,and foxtail millet *** and chromosomal synteny analysis showed that both MIR156s and SPLs are conserved across species in the grass *** of expression data of the SPLs in eleven juvenile and adult rice tissues revealed that four non-miR156-targeted genes were highly expressed and three miR156-targeted genes were only slightly expressed in all tissues/developmental *** remaining SPLs were highly expressed in the juvenile stage,but their expression was lower in the adult *** has been proposed that under strong selective pressure,non-miR156-targeted mRNA may be able to re-structure to form a miRNAresponsive *** our analysis,some non-miR156-targeted SPLs(SPL5/8/10)had gene structure and gene expression patterns similar to those of miR156-targeted genes,suggesting that they could diversify into miR156-targeted *** methylation profiles of SPLs and MIR156s in different rice tissues showed diverse methylation patterns,and hypomethylation of non-CG sites was observed in rice *** findings suggested that MIR156s and SPLs had different origination and evolutionary mechanisms:the SPLs appear to have resulted from vertical evolution,whereas MIR156s appear to have resulted from strong evolutionary selection on mature sequences.

摘要：Lead halide perovskite nanocrystals(NCs)exhibit high photoluminescence quantum yield(PLQY),high defect tolerance,narrow half peak width,and wide luminous gamut,making them the ideal optoelectronic materials in numerous ***,their production still suffers from the limited productivity at the bench *** this work,we fabricated CsPbX3(X=Cl,Br,I)NCs within droplet-based micro-reactors,where both the nucleation and growth processes could be precisely controlled inside 130-nL *** provides a new paradigm for the large-scale synthesis of perovskite NCs with high *** with other synthetic methods,this method can increase the concentration of reactant precursors by 3±116 times,while lowering the ligand to reactant ratio to 2%±50%of the commonly used hot-injection *** modulating the reaction temperature and residence time,the structure-function relationship between the morphology of NCs and PL properties was extensively *** microfluidic-based process allows the flexible adjustment in the proportion of PbX2 precursors to achieve the fabrication of perovskite NCs whose luminescence range covers the entire visible spectrum(406±677 nm)within one ***,perovskite NCs with different halide ions were encapsulated in polymethyl methacrylate to prepare a colored light-emitting diode strip.

摘要：尤·康·巴班斯基在辩证系统观的指导下，建构了教学教育过程最优化理论，并在实施有效教学的层面上给出了进行教学设计的一般程序，这一理论集中体现了教学设计的本质思想。这一教学设计思想从最优化原理出发，更加关注教学的有效性，这对当前新课程改革具有极其重要的现实意义。

摘要：霍夫曼重排反应作为制备伯胺及其衍生物的一种重要手段,在药物合成和功能材料制备等领域有广泛的应用。传统霍夫曼重排反应工艺存在反应效率低、流程烦琐和安全性差等问题。针对以上问题,研究者们主要从反应条件优化和过程强化两方面入手。通过反应条件优化,发展了许多温和、高选择性的反应工艺条件,为不同酰胺底物的反应方案设计提供了更多选择;微波辅助、电化学合成以及微化工技术等新型反应过程强化技术的出现,为实现高效绿色的霍夫曼重排反应创造了有利的条件。本文重点阐述了霍夫曼重排反应在反应条件优化和过程强化方面的最新研究进展。在此基础上,对该反应未来的研究方向进行了展望。

摘要：从小麦根际土壤中分离得到一株对禾谷镰刀菌有拮抗作用的菌株7F1。以菌株7F1基因组总DNA为模板,通过16S rDNA和gyrB基因序列分析,鉴定7F1为多粘类芽孢杆菌。本实验对该菌种产拮抗物的稳定性进行了研究,同时,应用特异性引物对7F1中脂肽类抗生素合成相关基因进行检测。结果表明：该菌产生的拮抗物在40-90℃保持较高的活性;在蛋白酶K、胃蛋白酶和胰蛋白酶处理后,抑菌活性显著下降;在pH 3.0-10.0具有抑菌活性;使用已报道的脂肽类抗生素基因片段设计的引物进行聚合酶链式反应扩增,从该菌的基因组DNA中扩增得到了3种bamC、eriSa、ituC脂肽类抗生素合成酶基因。此研究结果对脂肽类抗生素进一步的分离提供了重要参考。

摘要：针对当前煤矿绞车控制系统存在的电能浪费严重的问题,设计了基于节电的煤矿绞车控制系统,分析了绞车控制系统设计方案以及控制原理,并分别从硬件设计、软件设计两方面对绞车控制系统进行分析。实际使用结果表明,该煤矿绞车控制系统启动、停止时对机械设备的冲击力变小、坡度路段速度突变降低并达到节约电能的目的,煤矿绞车运行稳定,降低了煤矿绞车事故发生率。

摘要：随着时代发展和观念的改变,“无人种地”和“有地不种”已成为常态,出现了大量的闲置土地和闲置劳动力。本文设计开发了一款“掌上菜园”App,农户将闲置资源作为商品在App进行租赁,创造收益。城镇用户可以通过线上租用各种类型的服务,满足个人线上+线下体验式种菜的需求,最终将农村闲置资源循环利用起来。

摘要：针对煤矿井下辅助运输车运行过程中存在的安全隐患、运行效率低下的问题,设计基于控制器技术的辅助运输车智能监控系统。以PCM控制器为核心,利用数据采集卡采集传感器、控制信号信息并以CAN总线通信模式传送至控制器,完成数模转换、范围超限检测、故障信号检测后传送至智能监控系统,用于实时监控辅助运输车运行状态、参数信息以及故障信息等,保证辅助运输车安全、稳定、高效运行。

摘要：针对煤矿用带式输送机控制系统存在的实时性差、安全性低的问题,设计基于CAN总线优先级通讯的带式输送机控制系统。采用主从控制模式,主从控制器间以CAN总线通讯完成控制指令以及数据的交互,对优先级较高的控制指令优先发送,保证控制系统本质安全。该方案能够保证带式输送机控制系统的实时性和安全性,提高煤矿生产效率,具有较好的经济效益。

摘要：通过归纳现有运营商增值业务运营的特点,对认证、鉴权、控制方案进行具体的分析和阐述,为电信运营商相关系统建设及业务运营提供指导。