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Self‑Assembly MXene‑rgO/CoNi Film with Massive Continuous Heterointerfaces and Enhanced Magnetic Coupling for Superior Microwave Absorber

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Nano-Micro Letters 2022年第5期14卷 20-33页

作者： Xiao Li Zhengchen Wu Wenbin You Liting yang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438People’s Republic of China Department of Materials Science Fudan UniversityShanghai 200438People’s Republic of China

MXene, as a rising star of two-dimensional(2 D) materials, has been widely applied in fields of microwave absorption and electromagnetic shielding to cope with the arrival of the 5 g era. However, challenges arise due to the excessively high permittivity and the difficulty of surface modification of few-layered MXenes severely, which infect the microwave absorption performance. Herein, for the first time, a carefully designed and optimized electrostatic selfassembly strategy to fabricate magnetized MXene-r gO/Co Ni film was reported. Inside the synthesized composite film, r gO nanosheets decorated with highly dispersed Co Ni nanoparticles are interclacted into MXene layers, which effectively suppresses the originally self-restacked of MXene nanosheets, resulting in a reduction of high permittivity. In addition, owing to the strong magnetic coupling between the magnetic Fe Co alloy nanoparticles on the r gO substrate, the entire MXener gO/Co Ni film exhibits a strong magnetic loss capability. Moreover, the local dielectric polarized fields exist at the continuous heterointerfaces between 2 D MXene and r gO further improve the capacity of microwave loss. Hence, the synthesized composite film exhibits excellent microwave absorption property with a maximum reflection loss value of-54.1 d B at 13.28 gHz. The electromagnetic synergy strategy is expected to guide future exploration of high-efficiency MXene-based microwave absorption materials.

关键词： MXene Microwave absorption Composite materials graphene Electron holography

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Translocation and biotoxicity of metal (oxide) nanoparticles in the wetland-plant system

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 471-483页

作者： Xiangyu yang Qiang He Fucheng guo Xiaobo Liu Yi Chen Key Laboratory of the Three gorges Region’s Eco-Environment(Ministry of Education) College of Environment and EcologyChongqing UniversityChongqing 400044China National Centre for International Research of Low-Carbon and green Buildings Chongqing UniversityChongqing 400044China

Engineered nanoparticles(ENPs)threaten the environment through wastewater ***,constructed wetlands(CWs)are efficient methods for ENPs ***,the biotoxicity of ENPs on plants in CWs is ***,we investigated the distribution and bio-impacts of different ENPs(Ag NPs,TiO_(2) NPs,and CeO_(2) NPs)in plants under 5-and 60-day exposure to 1 and 50 mg/L *** showed that ENPs appeared in the vascular bundle and mesophyll cell space,which induced the variation in antioxidase activities(e.g.,superoxide dismutase[SOD],peroxidase[POD],and catalase[CAT]activities)as well as overproduction of malondialdehyde(MDA).Additionally,Ag NPs inhibited photosynthesis rate and root activity during two exposure ***_(2) NPs had positive and negative impacts on plants in 5-and 60-day exposure,***,TiO_(2) NPs enhanced photosynthesis and root activity under 60-day ***,the contents of the C,N,and P elements in plants fluctuated in response to ENPs *** results have a positive correlation with the wetland performance under ENPs exposure except for TiO_(2) NPs ***,our study systematically reveals aquatic plants'responses to ENPs and provides a reference for building ecological treatment systems to purify wastewater containing ENPs.

关键词： Constructed wetlands Aquatic plants Nanoparticles Physiological activity Biomass

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橙皮苷调控EI24 Th1/Th2细胞比例对抗肺纤维化作用及可能机制研究

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河北医学 2024年第3期30卷 359-366页

作者：张艳马文杨卉万方贵州医科大学附属医院贵州贵阳550004

目的:通过观察橙皮苷对博莱霉素诱导的大鼠肺纤维化的保护作用,并从依托泊诱导蛋白2.4(EI24)基因和Th1/Th1平衡方面探讨其相关机制。方法:将60只大鼠随机分成6组:假手术组、模型组、吡非尼酮组(阳性对照,0.12g/kg吡非尼酮)、低剂量橙皮... 详细信息

目的:通过观察橙皮苷对博莱霉素诱导的大鼠肺纤维化的保护作用,并从依托泊诱导蛋白2.4(EI24)基因和Th1/Th1平衡方面探讨其相关机制。方法:将60只大鼠随机分成6组:假手术组、模型组、吡非尼酮组(阳性对照,0.12g/kg吡非尼酮)、低剂量橙皮苷组(12mg/kg)、中剂量橙皮苷组(24mg/kg)和高剂量橙皮苷组(36mg/kg),每组10只。采用气管内注射博莱霉素建立肺纤维化大鼠模型。采用小动物呼吸机检测大鼠的肺功能指标用力肺活量(FVC)、第1秒用力呼气容积(FEV1)、呼气流量峰值(PEF)。采用苏木精伊红染色和Masson染色进行病理组织学评估。2023年2月采用酶联免疫吸附实验检测大鼠肺组织细胞因子水平。2023年2月采用流式细胞术分析大鼠肺组织中辅助T细胞(Th)亚群的占比情况。2023年2月采用蛋白免疫印迹检测肺组织中EI24蛋白的表达。结果:与模型组相比,橙皮苷处理组大鼠的FVC、FEV1、PEF均明显升高,且肺指数明显降低(PgF-β1、Col I、HYP、IL-6和TNF-α含量均明显降低(P<0.05)。与假手术组相比,模型组EI24 mRNA和蛋白表达显著降低;与模型组相比,中剂量橙皮苷组和高剂量橙皮苷组中EI24 mRNA和蛋白表达显著增加(P<0.05)。此外,与模型组相比,中剂量橙皮苷组和高剂量橙皮苷组大鼠肺组织中Th1细胞亚群占比明显升高,而Th2细胞亚群占比明显降低(P<0.05)。同时,中剂量橙皮苷组和高剂量橙皮苷组肺组织中IFN-γ水平显著升高,而IL-13和IL-4水平显著降低(P<0.05)。结论:橙皮苷能够减弱博莱霉素诱导的炎症细胞浸润、促炎细胞因子释放和ECM过度沉积,从而改善大鼠肺纤维化进程,其机制可能是通过调控EI24和Th1/Th2免疫细胞平衡来实现。

关键词：肺纤维化橙皮苷博莱霉素依托泊诱导蛋白2.4 免疫细胞

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云南主要茶产区茶叶中硒的含量空间分布特征

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昆明学院学报 2024年第3期46卷 45-50页

作者：张柳叶侯顺杨婉秋昆明学院化学化工学院云南昆明650214

硒是人体必需的微量元素,膳食是补充硒元素的良好途径.茶树对硒元素具有较好的富集能力,因此,茶叶是一种极具补硒潜力的食品.采用“电热板敞口消解-ICP-MS”的方法对云南主要茶产区(滇中产区、滇西产区、滇南产区和滇北产区)茶叶中硒的... 详细信息

硒是人体必需的微量元素,膳食是补充硒元素的良好途径.茶树对硒元素具有较好的富集能力,因此,茶叶是一种极具补硒潜力的食品.采用“电热板敞口消解-ICP-MS”的方法对云南主要茶产区(滇中产区、滇西产区、滇南产区和滇北产区)茶叶中硒的含量进行了测定.结果表明,云南茶叶中硒含量平均值为73.1μg/kg,变异系数为126.68%,各茶产区茶叶硒的平均含量由大到小分别为:滇中产区(94.52μg/kg)>滇南产区(72.55μg/kg)>滇西产区(70.65μg/kg)>滇北产区(34.75μg/kg).滇中和滇南产区达富硒茶叶(硒含量在200~4 000μg/kg之间)的占比分别为6.89%和1.59%,说明滇中和滇南产区具有开发富硒茶园的潜力.茶叶硒含量与环境及气候因子(土壤背景值、温度、降雨、日照等)之间的相关性分析结果表明,茶叶中硒的含量与土壤背景值之间存在一定的相关性,但与气候因素之间无相关关系.不同加工方式茶叶中硒含量均值差异不大,相较而言红茶硒含量较高且较为稳定,说明茶叶中硒的含量受到加工方式的影响较小,主要受到鲜叶原料的成熟度影响.

关键词：云南茶产区硒茶叶空间分布特征

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薄膜包装结合1-MCP对大同鲜黄花采后生理及品质影响

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食品与发酵工业 2024年第9期50卷 227-237页

作者：宋燕南王亚希白宇皓杨志国赵迎丽狄建兵王亮山西农业大学食品科学与工程学院山西太原030000

为确定适宜的鲜黄花贮藏条件,达到降低采后损失、延长货架期的目的,该研究采用不同厚度(30μm、40μm、50μm)聚乙烯(polyethylene,PE)薄膜包装结合1-甲基环丙烯(1-methylcyclopropene,1-MCP)对鲜黄花进行自发气调保鲜处理,在(0±0.5)... 详细信息

为确定适宜的鲜黄花贮藏条件,达到降低采后损失、延长货架期的目的,该研究采用不同厚度(30μm、40μm、50μm)聚乙烯(polyethylene,PE)薄膜包装结合1-甲基环丙烯(1-methylcyclopropene,1-MCP)对鲜黄花进行自发气调保鲜处理,在(0±0.5)℃贮藏条件下对鲜黄花相关品质指标变化以及微观结构特征等进行分析。结果表明,薄膜包装结合1-MCP处理是延长鲜黄花保鲜寿命的有效方式。在(0±0.5)℃贮藏条件下,50μm PE薄膜+1-MCP处理有效抑制了鲜黄花呼吸强度和乙烯释放速率的上升,减缓了硬度以及叶绿素含量的下降,维持了鲜黄花的色泽,降低失重率和腐烂率。贮藏至35 d时,50μm PE薄膜+1-MCP处理的呼吸强度、乙烯释放速率、硬度、叶绿素含量为61.25 mg CO_(2)/(kg·h)、55.29μL/(kg·h)、42.41 N、0.0149 mg/g,失重率和腐烂率比CK处理分别降低了0.66%和80.33%。还抑制组织相对电导率的上升和丙二醛(malondialdehyde,MDA)含量的增高并有效提高了过氧化物酶(peroxidase,POD)、过氧化氢酶(catalase,CAT)活性,抑制了纤维素酶(cellulase,Cx)、β-葡萄糖苷酶(β-glucosidase,β-glu)活性的上升。贮藏至35 d时,与CK处理相比,50μm PE薄膜+1-MCP处理的组织相对电导率和MDA含量降低了19.18%、17.51μg/g,POD、CAT活性高达15.05 U/(min·g)、85.28 U/(min·g),Cx、β-glu活性低至707.86μg/(h·g)、209.41μg/(h·g),较好的保持了鲜黄花的细胞形态。其中,50μm PE薄膜+1-MCP处理为鲜黄花最佳保鲜方案。

关键词：黄花贮藏气调包装 1-甲基环丙烯生理品质

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Unsupervised image translation with distributional semantics awareness

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Computational Visual Media 2023年第3期9卷 619-631页

作者： Zhexi Peng He Wang Yanlin Weng Yin yang Tianjia Shao State Key Lab of CAD&Cg Zhejiang UniversityHangzhou 310058China School of Computing University of LeedsLeedsUK School of Computing Clemson UniversityClemsonUSA

Unsupervised image translation(UIT)studies the mapping between two image *** such mappings are under-constrained,existing research has pursued various desirable properties such as distributional matching or two-way *** this paper,we re-examine UIT from a new perspective:distributional semantics consistency,based on the observation that data variations contain semantics,e.g.,shoes varying in ***,the semantics can be multi-dimensional,e.g.,shoes also varying in style,functionality,*** two image domains,matching these semantic dimensions during UIT will produce mappings with explicable correspondences,which has not been investigated *** propose distributional semantics mapping(DSM),the first UIT method which explicitly matches semantics between two *** show that distributional semantics has been rarely considered within and beyond UIT,even though it is a common problem in deep *** evaluate DSM on several benchmark datasets,demonstrating its general ability to capture distributional *** comparisons show that DSM not only produces explicable mappings,but also improves image quality in general.

关键词： generative adversarial networks(gANs) manifold alignment unsupervised learning image-to-image translation distributional semantics

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老年股骨粗隆间骨折髓内固定术后髋关节功能恢复影响因素的Meta分析

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中国老年保健医学 2024年第2期22卷 35-40页

作者：袁建坤杨怡李璇王峻云南中医药大学 650500 大理大学 671003 云南大学附属医院 650031

目的系统评价老年股骨粗隆间骨折髓内固定术后髋关节功能恢复障碍的影响因素。方法系统检索The Co⁃chrane Library、EMbase、PubMed、Web of Science、中国知网、中国生物医学数据库、万方数据库、维普数据库中公开发表的关于老年股骨... 详细信息

目的系统评价老年股骨粗隆间骨折髓内固定术后髋关节功能恢复障碍的影响因素。方法系统检索The Co⁃chrane Library、EMbase、PubMed、Web of Science、中国知网、中国生物医学数据库、万方数据库、维普数据库中公开发表的关于老年股骨粗隆间骨折髓内固定术后髋关节功能恢复影响因素的研究,检索时限为2017年1月1日至2023年3月10日。由2名研究员根据纳入和排除标准独立进行文献筛选和数据提取,进行质量评价后使用Review Manager 5.4软件进行Meta分析。结果最终纳入7篇文献。Meta分析结果显示,骨折类型(OR=4.81,95%CI 1.64~14.11,P=0.0040.01)不是术后髋关节功能恢复的影响因素。结论稳定型骨折、超早期负重、年龄g/L、有康复师指导、良好复位、术后并发症发生率低、合并基础疾病少、选择全麻或椎管内麻醉均为老年股骨粗隆间骨折髓内固定术后髋关节功能恢复的促进因素,尚无较多证据证明手术时机为髋关节功能恢复的影响因素。

关键词：老年人股骨粗隆间骨折股骨转子间骨折髓内固定功能恢复影响因素二次分析

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Selection of anticoagulant solution to the hemolymph of Chlamys farreri by transmission electron microscropy and flow cytometry

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High Technology Letters 2007年第2期13卷 221-224页

作者：陈慕雁 yang Hongsheng Shi Fangfang Institute of Oceanology Chinese Academy of Sciences Qingdao 266071P.R.China graduate University Chinese Academy of Sciences Beijing 100049 P.R.China

Mixtures of hemolymph from Chlamys farreri with three different anticoagulant solutions were incu-bated for an hour in vitro, then the ultrastructural alterations of hemocytes were observed, and the aggre-gation rate was analyzed by using transmission electron microscropy and flow cytometry respectively. The results showed that Formula 3 （glucose 20.8 g L^-1; EDTA 20mM; sodium chloride 20 g L^-1; Tris-HCI 0.05M;pH 7.4）was the desirable anticoagulant solution for C. farreri hemocytes. Further phagocytosis assay showed that no obvious negative effect was given to the hemocyte phagocytic activity when using Formula 3 as the anticoagulant solution.

关键词： hemolymph anticoagulant solution TEM flow cytometry Chlamys farreri

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Size effect of fracture characteristics for anisotropic quasi-brittle geomaterials

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International Journal of Mining Science and Technology 2023年第2期33卷 201-213页

作者： Cunbao Li Dongchao yang Heping Xie Li Ren Jun Wang guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep Engineering Sciences and green Energy College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China MOE Laboratory of Deep Earth Science and Engineering Sichuan UniversityChengdu 610065China

Understanding the size effect exhibited by the fracture mechanism of anisotropic geomaterials is important for engineering practice. In this study, the anisotropic features of the nominal strength, apparent fracture toughness, effective fracture energy and fracture process zone(FPZ) size of geomaterials were first analyzed by systematic size effect fracture experiments. The results showed that the nominal strength and the apparent fracture toughness decreased with increasing bedding plane inclination *** larger the specimen size was, the smaller the nominal strength and the larger the apparent fracture toughness was. When the bedding inclination angle increased from 0° to 90°, the effective fracture energy and the effective FPZ size both first decreased and then increased within two complex variation stages that were bounded by the 45° bedding angle. Regardless of the inherent anisotropy of geomaterials,the nominal strength and apparent fracture toughness can be predicted by the energy-based size effect law, which demonstrates that geomaterials have obvious quasi-brittle characteristics. Theoretical analysis indicated that the true fracture toughness and energy dissipation can be calculated by linear elastic fracture mechanics only when the brittleness number is higher than 10;otherwise, size effect tests should be adopted to determine the fracture parameters.

关键词： Size effect Inherent anisotropy Fracture toughness Fracture energy Effective FPZ size Quasi-brittle geomaterials

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Suppression of Replication of Rabies Virus by Short Hairpin RNAs Expressed by Plasmid

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畜牧兽医学报 2011年第B12期42卷 24-29页

作者： yang Rui-mei yang Song-tao XIA Xian-zhu College of Animal Science and Veterinary Medicine Qingdao Agricultural University Qingdao 265200 China Institute of Military Veterinary Academy of Military Medical Sciences Changchun 130062 China）

Targeting the N gene of rabies virus (RV), four shRNA expression plasmids were designed and constructed based on the vector pRNATU6.3-Hygro that expresses fusion protein with gFP as a reporter gene. Four cell strains (N1, N2, N3, N4) expressing the short hairpin RNAs (shRNA) were obtained after the plasmids were transfected into BHK-21 cells and screened under the pressure of Hygromycin B (300 μg/mL). These cell strains were infected with 100× the TCID 50 of rabies virus CVS-11 strain, and the viral replication was quantified at 24, 48, 72 and 96 hours by directed immunofluorescence assay (DFA), real-time PCR, and the 50% tissue culture infective dose (TCID 50 ). The results showed variable inhibition of viral replication, with BHK-N2 being the most effective strain (99% inhibition). There was close correspondence between results using the three methods of evaluation. The shRNA-mediated inhibition persisted to at least 96 hours after infection. Effective inhibition of replication of RV in BHK-21 cells was achieved by siRNA targeting the N gene, with N 2 , aimed at the region starting at position 701 of the gene, being the most potent.

关键词： shRNA 病毒复制狂犬病毒发夹结构质粒表达 BHK-21细胞短发夹RNA 实时PCR

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