Simple preparation of C(CS)/g-C_(3)N_(4)/Co carbon aerogel and its catalytic performance for ammonium perchlorate

Biomass chitosan(CS)was used as a template,graphitic phase carbon nitride(g-C_(3)N_(4))with high nitrogen content and certain catalytic activity was used as a dopant,and nano-transition metal cobalt(Co)was used as a catalytic center point.The carbon aerogel(C(CS)/g-C_(3)N_(4)/Co)with a three-dimensional network-like structure was prepared by assembling the three materials through experimental operations such as freeze-drying and high-temperature carbonization.It was demonstrated by scanning and transmission characterization that the CS in the carbon aerogel could provide more active sites for the cobalt nanoparticles,and the doping of graphite-phase carbon nitride as a template dispersed the cobalt nanoparticles and changed the conductivity of the CS.To investigate the catalytic effect of carbon aerogel on ammonium perchlorate(AP),it was investigated by differential thermal analyzer and TG thermal analysis.This carbon aerogel was very effective in catalyzing AP,and the 10 wt% content of the catalyst reduced the AP pyrolysis peak from 703.9 to 595.5 K.And to further investigate the synergistic effect of the three materials,further carbon aerogels such as C(CS)/Co,g-C_(3)N_(4)/Co were prepared and applied to catalyze AP,and the same ratio reduced the AP pyrolysis peak by 98.1℃ and 97.7℃.This result indicates a synergistic effect of the assembly of the three materials.

Clinical features of intracranial metastasis of primary hepatocellular carcinoma with burst diplopia as the first manifestation:a case report

Intracranial metastasis of liver cancer is rare,and diplopia as the first manifestation is even more rare.This article aims to introduce a patient with sudden diplopia in a middle-aged man.Physical examination revealed left abductor nerve palsy,craniocerebral magnetic resonance imaging(MRI)showed intracranial metastatic tumor,and positron emission tomography-computer tomography(PET-CT)tracing of the original lesion detected the primary liver cancer.This paper provides clinical data for intracranial metastasis of primary liver cancer and the possible pathogenesis and mechanism of sudden diplopia.

本征可修复的导电聚合物/水凝胶纳米复合薄膜及其独特的体沟道用于实现高性能、柔性和可修复的有机光电晶体管

柔性有机光电晶体管(OPTs)在大机械形变的下一代可穿戴系统中至关重要.然而,目前报道的大多数OPTs都是场效应基结构,其界面电荷传输和本征低跨导的特性限制了OPTs的机械柔性和光电性能的发展.此外,沟道层的p共轭半导体聚合物也缺乏特殊的可修复位点,使其很难实现薄膜的自我修复功能.本文报道了一个具有独特体沟道和强修复功能的柔性高光电性能的OPTs.该OPTs使用有机电化学晶体管架构,由3D体沟道的可修复导电聚合物/水凝胶复合薄膜组成.该器件不仅在遭受损伤后能够在100 ms内有效恢复其机械和电学性能,同时还展现出出色的机械柔性.更重要的是,该器件实现了紫外光波段的高光测性能,其中光响应度高达1.01×10^(5)A W^(-1),探测率达1.01×10^(5)A W^(-1),外量子效率达3.03×104%.结果表明,具有独特体沟道和本征可修复功能的OPTs在下一代可穿戴电子器件的使用中具有潜在应用价值.

Curation,nomenclature,and topological classification of receptor-like kinases from 528 plant species for novel domain discovery and functional inference

Receptor-like kinases(RLKs)are the most numerous signal transduction components in plants and play important roles in determining how different plants adapt to their ecological environments.Research on RLKs has focused mainly on a small number of typical RLK members in a few model plants.There is an urgent need to study the composition,distribution,and evolution of RLKs at the holistic level to increase our understanding of how RLKs assist in the ecological adaptations of different plant species.In this study,we collected the genome assemblies of 528 plant species and constructed an RLK dataset.Using this dataset,we identified and characterized 524948 RLK family members.Each member underwent systematic topological classification and was assigned a gene ID based on a unified nomenclature system.Furthermore,we identified two novel extracellular domains in some RLKs,designated Xiao and Xiang.Evolutionary analysis of the RLK family revealed that the RLCK-XVII and RLCK-XII-2 classes were present exclusively in dicots,suggesting that diversification of RLKs between monocots and dicots may have led to differences in downstream cytoplasmic responses.We also used an interaction proteome to help empower data mining for inference of new RLK functions from a global perspective,with the ultimate goal of understanding how RLKs shape the adaptation of different plants to the environments/ecosystems.The assembled RLK dataset,together with annotations and analytical tools,forms an integrated foundation of multiomics data that is publicly accessible via the metaRLK web portal(http://metaRLK.biocloud.top).

Structural and biochemical basis of Arabidopsis FERONIA receptor kinase-mediated early signaling initiation

Accumulating evidence indicates that early and essential events for receptor-like kinase(RLK)function involve both autophosphorylation and substrate phosphorylation.However,the structural and biochemical basis for these events is largely unclear.Here,we used RLK FERONIA(FER)as a model and crystallized its core kinase domain(FER-KD)and two FER-KD mutants(K565R,S525A)in complexes with ATP/ADP and Mg^(2+) in the unphosphorylated state.Unphosphorylated FER-KD was found to adopt an unexpected active conformation in its crystal structure.Moreover,unphosphorylated FER-KD mutants with reduced(S525A)or no catalytic activity(K565R)also adopt similar active conformations.Biochemical studies revealed that FER-KD is a dual-specificity kinase,and its autophosphorylation is accomplished via an intermolecular mechanism.Further investigations confirmed that initiating substrate phosphorylation requires autophosphorylation of the activation segment on T696,S701,and Y704.This study reveals the structural and biochemical basis for the activation and regulatory mechanism of FER,providing a paradigm for the early steps in RLK signaling initiation.

基于CsPbBr_(3)量子点/PDVT-10共轭聚合物杂化薄膜的光突触晶体管用于高效的神经形态计算

光突触晶体管被视为有潜力的神经形态计算系统,有望克服基于冯诺依曼架构运算的固有限制.然而,具备简单制备工艺和高效信息处理能力的光突触晶体管的设计和构建面临着巨大的挑战.本文报道了一种通过旋涂CsPbBr_(3)钙钛矿量子点(QDs)和PDVT-10共轭聚合物共混物来制备光突触晶体管的新方法.由CsPbBr_(3)QDs和PDVT-10组成的杂化薄膜具有平坦的表面、优异的光吸收和良好的电荷传输性能,有助于此类钙钛矿基突触实现高效的光电转换.因此,基于CsPbBr_(3)QDs和PDVT-10杂化薄膜的光突触晶体管表现出了优异的器件性能,并具有基本的突触功能,包括兴奋性突触后电流、双脉冲促进和长程记忆.通过利用光增强和电抑制特性,基于钙钛矿的光突触晶体管被成功应用于神经形态计算,其模式识别精度高达89.98%,这是迄今为止用于模式识别的突触晶体管的最高值之一.这项工作为制备高模式识别精度的钙钛矿基神经形态系统提供了一条有效且方便的途径.

基于增强电子传输的双层MXene/半导体高性能n型薄膜晶体管

电介质/半导体的界面工程是制备高性能有机场效应晶体管的关键.本工作提出采用MXene/半导体双层结构制备高性能n型晶体管,其中载流子的形成和调控发生在二氧化硅/半导体界面,同时高迁移率和长横向尺寸的MXene纳米片作为主要的电荷传输通道.通过调节MXene纳米片的互连度,优化了器件的电学性能.与单层N2200晶体管相比,MXene/N2200晶体管表现出显著增强的n型特性,包括提升100倍的场效应迁移率、10^(4)电流开关比以及0.64 V dec^(-1)亚阈值摆幅.MXene/N2200晶体管的高性能归因于MXene纳米沟道的电负性和高迁移率.电负性显著增强了电子从N2200向MXene沟道的转移,而高迁移率使得电子有效传输至电极.MXene/p型半导体晶体管却表现出受抑制的p型性能,这是因为MXene纳米片具有高度电负性.此外,本文提出的双层MXene/n型半导体结构也具有良好的结构普适性和高性能优势.这些结果表明双层MXene/半导体结构有望应用于高性能n型晶体管的制备.

具有光电信号双输出的发光电化学人工突触

尽管近年来多种突触器件的研究已取得了显著进展,但寻找具有新功能的人工突触器件仍是构建人工神经网络的重要任务.片上光电互连技术的成熟使得人工神经网络中的权重更新能以光和电的形式进行,作为权重控制端的人工突触器件中光电信号的并行输出便成为一个有趣和值得拥有的功能.在大规模神经网络的设计中,光电信号双输出能够提供额外的输出自由度并降低电子引线密度.因此,本研究首次开发了基于聚[2-甲氧基-5-(2-乙基己氧基)-1,4-苯乙炔]/聚(环氧乙烷)/锂盐共混的具有光电信号双输出的发光电化学人工突触(LEEAS).LEEAS中的电化学氧化还原反应使该器件能够实现生物学中的突触可塑性,并模拟了记忆增强过程、高通滤波特性和经典的巴甫洛夫条件反射实验.此外,在连续相同的电脉冲刺激下,LEEAS的瞬态发光强度表现出类似突触可塑性的增强行为.由于结合了电致发光和突触记忆行为,LEEAS阵列展现了独特的图像显示和存储功能,可以记忆显示过的图像.本研究提出的LEEAS丰富了人工突触器件的种类,促进了下一代光电混合人工神经网络的多样化设计与发展.