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Subnanometric bimetallic Pt-Pd clusters in zeolites for efficient hydrogen production and selective tandem hydrogenation of nitroarenes

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Science China Chemistry 2024年第9期67卷 2911-2917页

作者： jiafu li Tao Cai Yanran Feng Xia liu Ning Wang Qiming Sun Institute of Sustainable Energy and Resources College of Chemistry and Chemical EngineeringKey Laboratory of Shandong Provincial Universities for Functional Molecules and MaterialsQingdao UniversityQingdao 266071China Innovation Center for Chemical Sciences College of ChemistryChemical Engineering and Materials ScienceJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123China

The solvolysis of ammonia borane(AB)and the hydrogenation of nitroarenes represent significant reactions for hydrogen generation and value-added chemical *** strategic engineering of the catalysts is imperative for surmounting obstacles associated with their stability and catalytic *** this work,subnanometric bimetallic Pt–Pd clusters were encapsulated within silicalite-1(S-1)zeolites through a ligand-protected in-situ hydrothermal synthesis *** synergetic effect of bimetallic composition and zeolite confinement markedly enhances the catalytic performance of representative Pt_(0.5)Pd_(0.5)@S-1-H catalyst,affording exceptional turnover frequency(TOF)values of 1,043 and 573 mol_(H_(2))mol_(metal)^(-1)min^(-1)for AB hydrolysis and methanolysis at ambient conditions,respectively,surpassing most of the state-of-the-art Pt-based *** and isotopic experiments reveal that the bimetallic catalytic system remarkably boosts the O-H cleavage of water,thereby facilitating the H_(2) production from AB ***,a conspicuous synergistic effect is demonstrated in the shape-selective tandem hydrogenation of nitroarenes,with the bimetallic catalyst facilitating both AB hydrolysis and nitroarene hydrogenation,giving a high TOF value of 1,260 h^(-1)under atmospheric *** study not only demonstrates the effectiveness of bimetallic nanocatalysts encapsulated in zeolites for hydrogen production from chemical hydrogen storage materials,but also paves the way for the design of catalysts with multifunctional active sites capable of synergistically promoting tandem catalytic processes.

关键词： subnanometer bimetallic cluster zeolite synergistic effect ammonia borane solvolysis selective tandem hydrogenation

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Precautions in delivery of pregnant women infected with COVID-19

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中华妇产科杂志 2020年第2期 73-74页

作者： Qi Hongbo Chen Dunjin Feng ling Zou li li jiafu Department of Obstetrics and Gynecology Third Affiliated Hospital of Guangzhou Medical University Guangzhou 510150 China Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Union Hospital Wuhan 430022 Zhongnan Hospital of Wuhan University Wuhan 430071

Once maternal infection of COVID-19 is suspected or confirmed, childbirth becomes complicated and challenging. Precautions in determining the timing of delivery, the indications of caesarean section, preparation of the delivery room to prevent infection during delivering, choosing the type of anesthesia, and newborn management, which are the primary concern of obstetricians, should be taken. COVID-19 infection is not the indication for terminating pregnancy, but the termination of pregnancy should be evaluated case by case. Maternal disease progression, gestational age and fetal intrauterine status are primary concerns. On condition that maternal safety is assured, the timing of delivery should be considered based on gestational age. The selection of delivery method should be based on obstetric indications. Negative pressure isolation ward is proffered for delivery and strict infection protection is required for all medical staff. Most doctors prefer to use epidural anesthesia for pregnant women infected with COVID-19. For confirmed infected mothers, their newborns should be quarantined for at least 14 days.

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GCN5 Acetyltransferase Inhibits PGC1α-induced Hepatitis B Virus Biosynthesis

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Virologica Sinica 2013年第4期28卷 216-222页

作者： Xiaohui Tian Fei Zhao Zhikui Cheng Ming Zhou Xiaoguang Zhi jiafu li Kanghong Hu State Key Laboratory of Virology Wuhan Institute of Virology Chinese Academy of Sciences Department of Obstetrics and Gynecology Zhongnan Hospital of Wuhan University Biomedical Center Hubei University of Technology

Hepatitis B virus （HBV） biosynthesis is primarily restricted to hepatocytes due to the governing of liver-enriched nuclear receptors （NRs） on viral RNA synthesis. The liver-enriched NR hepatocyte nuclear factor 4α （HNF4α, the key regulator of genes implicated in hepatic glucose metabolism, is also a primary determinant of HBV pregenomic RNA synthesis and HBV replication. Peroxisome proliferator-activated receptor-r coactivator la （PGCla） coactivates and further enhances the effect of HNF4α on HBV biosynthesis. Here, we showed that the acetyltransferase General Control Non-repressed Protein 5 （GCN5） acetylated PGC 1 α, leading to alteration of PGC 1 α from a transcriptionally active state into an inactive state. As a result, the coactivation activity of PGCla on HBV transcription and replication was suppressed. Apparently, an acetylation site mutant of PGC 1 α （PGC 1 αR13） still had coactivation activity as GCN5 could not suppress the coactivation activity of the mutant. Moreover, a catalytically inactive acetyltransferase mutant GCN5m, due to the loss of acetylation activity, failed to inhibit the coactivation function of PGClα in HBV biosynthesis. Our results demonstrate that GCN5, through its acetyltransferase activity, inhibits PGCla-induced enhancement of HBV transcription and replication both in vitro and in vivo.

关键词： Hepatitis B Virus (HBV) PGClα GCN5 Acetylation

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DELAY JITTER OF A PERIODIC CELL STREAM THROUGH AN ATM MULTIPLEXER IN A BURSTY TRAFFIC ENVIRONMENT

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Journal of Electronics(China) 1997年第4期14卷 318-327页

作者： He jiafu li Lemin(University of Electronic Science and Technology of China, Chengdu 610054) University of Electronic Science and Technology of China Chengdu

The periodic cell stream is a very important member among the input traffic sources in ATM networks. In this paper, a finite-buffered ATM multiplexer with traffic sources composed of a periodic cell stream, multiple i.i.d Bernoulli cell streams and bursty two-state Markov Modulated Bernoulli Process (MMBP) cell streams is exactly analyzed. The probability mass function of queuing delay, the autocorrelation and power spectrum of delay jitter for this periodic cell stream are derived. The analysis is used to expose the behavior of delay jitter for a periodic cell stream through an ATM multiplexer in a bursty traffic environment. The simulation results indicate that the analytical results are accurate.

关键词： ATM multiplexer Periodic cell stream Bursty traffic Delay jitter

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Cluster Effects during High Pressure Supersonic Molecular Beam Injection into Plasma

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中国核科技报告 2002年 874-880页

作者： YAO lianghua FENG Beibin DONG jiafu li Wenzhong FENG Zhen HONG Wenyu li Bo

1 What are clusters and what are their specialties?When we speak of clusters, we have in mind entities which have neither the well-defined compositions, geometries, and strong bonds of conventional molecules nor the boundary-independent properties of bulk matter. For example, an aggregate of a few atoms held together by Van der Waals forces constitutes a cluster. But

关键词： Supersonic molecular beam injection Tokamak Cluster Pellet injection

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分子筛限域单原子金属催化剂的研究进展

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高等学校化学学报 2022年第5期43卷 116-133页

作者：李加富张凯王宁孙启明青岛大学化学化工学院可持续能源和资源研究院青岛266071 苏州大学材料与化学化工学部化学科学国际合作创新中心苏州215123

分子筛由于具有规则的微孔孔道结构、较大的表面积、优异的(水)热稳定性,被认为是限域合成超小尺寸金属物种的理想载体.近年来,分子筛限域单原子金属催化剂由于超高的金属分散度、接近100%的金属利用率以及独特的电子结构,被广泛地应用... 详细信息

分子筛由于具有规则的微孔孔道结构、较大的表面积、优异的(水)热稳定性,被认为是限域合成超小尺寸金属物种的理想载体.近年来,分子筛限域单原子金属催化剂由于超高的金属分散度、接近100%的金属利用率以及独特的电子结构,被广泛地应用于重要的催化反应和气体吸附分离过程.本文系统地总结了近年来分子筛限域不同类型单原子金属催化剂的合成策略,以及其在多相催化和气体分离等领域的研究进展.最后,提出了分子筛限域单原子金属催化剂在合成与表征方面存在的挑战和未来的发展方向.

关键词：分子筛单原子多相催化限域效应

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Atorvastatin Reduces TGF-β1-induced Human Ventricular Fibroblasts Proliferation,Differentiation and Collagen Synthesis via Inhibition of Smad2/3and Erk1/2 Signaling Pathways

Atorvastatin Reduces TGF-β1-induced Human Ventricular Fibro...

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2019年中国生理学会心血管生理学术研讨会

作者： Yanfei Du Xinyu Wang Shuzhan Zhen Jian Feng Qiang Ye jiafu li Guang li Zhongcai Fan Department of Cardiology The Affiliated Hospital of Southwest Medical University Key Laboratory of Ministry of Education for Medical Electrophysiology and the Institute of Cardiovascular Research Southwest Medical University

＜正＞Aims:Differentiation of cardiac fibroblasts （CFs） into myofibroblasts plays a critical role in cardiac ***（ATV）,a HMG-CoA reductase inhibitor,has been shown to have potent anti-fibrotic ***,the underlying me...

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Construction of cytopathic PK-15 cell model of classical swine fever virus

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Chinese Science Bulletin 2003年第9期48卷 887-891页

作者： WU Haixiang, ZHANG Chuyu, ZHENG Congyi, WANG jiafu, PAN Zishu, li Lei, CAO Shen & Yl GuanghuiInstitute of Virology, College of life Sciences, Wuhan University, Wuhan 430072, ChinaCorrespondence should be addressed to Zhang Chuyu (e-mail: avlab@ ***) Institute of Virology College of Life Sciences Wuhan University Wuhan 430072 China

No cytopathic effect (CPE) can be observed on classical swine fever virus (CSFV) infected cell culture in vitro. This brings an obstacle to the researches on reciprocity between CSFV and host cells. Based on the construction of full-length genomic infectious Cdna clone of Chinese CSFV standard virulent Shimen strain, partial deletion is intro- duced into genomic Cdna to obtain a 7.5 kb subgenomic Cdna. A new subgenomic CSFV is derived from transfection with the subgenomic Cdna on PK-15 cells pre-infected by CSFV Shimen virus. Typical CPE induced by this subgenomic virus is observed on PK-15 cells. Coexistence of wild- type and subgenomic virus in cytopathic cell culture is dem- onstrated by RT-PCR detection in cytopathic cells. For conclusion, the construction of cytopathic cell model exploited a new way for researches on the molecular mechanism of CSFV pathogenesis.

关键词： PK-15 细胞结构病变细胞传统猪狂热病毒 CSFV cDNA 基因克隆

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血清胱抑素C水平对急性前壁心梗患者心功能有一定预测价值

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基因组学与应用生物学 2018年第1期37卷 87-94页

作者：李春慧李家富西南医科大学附属医院泸州64600 成都市第二人民医院成都610017

为了探讨影响急性前壁心肌梗死患者经皮冠状动脉介入治疗术（PCI）后心力衰竭的因素,检测血清胱抑素C水平在用PCI术治疗急性前壁心梗患者心力衰竭术后影响,本研究选择2013年1月~2017年3月在我院接受PCI治疗的急性前壁心肌梗死患者287例... 详细信息

为了探讨影响急性前壁心肌梗死患者经皮冠状动脉介入治疗术（PCI）后心力衰竭的因素,检测血清胱抑素C水平在用PCI术治疗急性前壁心梗患者心力衰竭术后影响,本研究选择2013年1月~2017年3月在我院接受PCI治疗的急性前壁心肌梗死患者287例作为研究对象,翻阅患者病历,记录患者性别、年龄、体质量指数、合并疾病、个人史、发病至手术时间、入院时血糖、血脂、血压、白细胞、受累导联数、术前用药、罪犯血管、术前LVEF、术后TIMI血流、病变血管术、BNP水平、CysC水平,观察上述指标与术后心力衰竭的相关性。结果本研究中287例急性前壁心肌梗死患者PCI术后出现心力衰竭71例,心力衰竭发生率为24.74%。单因素分析显示,年龄、糖尿病、高血压、梗死前心绞痛、术前血糖、白细胞、术前收缩压、术前舒张压、LDL-C、术前BNP、术前CysC、术前LVEF、术后TIMI分级是影响急性前壁心肌梗死患者PCI术后心力衰竭发生的危险因素（p〈0.05）。多因素分析显示,年龄〉73.6岁、高血压、术前血糖〉8.72 mmol/L、术前CysC〉1.57 mg/L是急性前壁心肌梗死患者PCI术后心力衰竭的独立危险因素（p〈0.05）,LVEF〉48.57%、术后TIMI〉2级为急性前壁心肌梗死患者PCI术后心力衰竭的保护性因素（p〈0.05）。本研究表明,急性前壁心梗患者PCI术后心力衰竭是多种因素协同作用的结果,术前CysC水平升高对患者PCI术后心力衰竭具有一定预测价值,值得临床推广应用。

关键词：急性前壁心肌梗死经皮冠状动脉介入术胱抑素C 心力衰竭

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Improving performance of parts storage through line-cell conversion

Improving performance of parts storage through line-cell con...

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2009中国控制与决策会议

作者： Jun Gong,Qian li,jiafu Tang Institute of Systems Engineering,Northeastern University,Shenyang 110004,CHINA

The cell assembly system is a new innovation of production strategies in the *** are many system performances needed to evaluate for the line-cell conversion,parts storage is one of them,In this paper,an overview of line-cell conversion to generate insights of the innovation is presented at first,and then a mathematical model is proposed to describe the performance of parts storage in a cell assembly *** last,some numerical simulation experiments are designed and executed to evaluate the system performance of parts storage.

关键词： Cell assembly systems Assembly line systems Parts storage Cross-trained line-cell conversion

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