检索结果-内蒙古大学图书馆

Bio-synthesis of palladium nanocubes and their electrocatalytic properties

IET NANOBIOTECHNOLOGY 2018年第8期12卷 1031-1036页

作者： peng, xuwen Cui, Zelin Bai, Xuefeng Lv, Hongfei Heilongjiang Univ Sch Chem & Mat Sci Harbin 150080 Heilongjiang Peoples R China Heilongjiang Acad Sci Inst Petrochem Harbin 150040 Heilongjiang Peoples R China

The bio-synthesis of palladium nanocubes (PdNCs) was realised using pine needle extract as the reducing agent and cetyl trimethyl ammonium bromide as the capping agent. As an eco-friendly and readily available biomass, pine needle extract avoided the use of highly polluting chemical reducing agents. The growth process of PdNCs was analysed using ultraviolet-vis and Fourier transform infrared spectroscopy. Flavonoids, esters, terpenoids and polyhydric alcohols, which contain reductive groups, were mainly responsible for the transition of Pd2+ ions to PdNCs. The morphology and structure of PdNCs were characterised using transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction and X-ray diffraction. It was indicated that the as-prepared PdNCs displayed a relatively high purity and good crystallinity with a face-centred cubic structure and exhibited sizes ranging from 6.11 to 29.51nm with an average particle size of 11.18nm. In the methanol electro-oxidation reaction, the PdNCs enclosed by {100} facets exhibited superior electro-catalytic activity to commercial Pd/C, which was rarely reported in other bio-synthesis processes for Pd catalysts. Meanwhile, the PdNCs showed excellent anti-poisoning ability and long-term stability. This study reveals the possibility of preparing shape-controlled PdNCs with a specific structure and excellent electro-catalytic activity.

关键词： transmission electron microscopy oxidation electron diffraction catalysts visible spectra reduction (chemical) catalysis palladium nanofabrication nanoparticles particle size ultraviolet spectra X-ray diffraction electrolysis Fourier transform infrared spectra organic compounds palladium nanocubes cetyl trimethyl ammonium bromide capping agent chemical reducing agents high-resolution TEM selected area electron diffraction biomass electrocatalytic properties pine needle extract ultraviolet-visible spectroscopy Fourier transform infrared spectroscopy flavonoids esters terpenoids polyhydric alcohols transmission electron microscopy X-ray diffraction face-centred cubic structure particle size methanol electrooxidation reaction biosynthesis processes catalysts antipoisoning ability long-term stability Pd

来源：评论

学校读者我要写书评

暂无评论

Green synthesis of Pd truncated octahedrons using of firmiana simplex leaf extract and their catalytic study for electro-oxidation of methanol and reduction of p-nitrophenol

引用

APPLIED ORGANOMETALLIC CHEMISTRY 2019年第8期33卷 e5045-e5045页

作者： peng, xuwen Bai, Xuefeng Cui, Zelin Liu, Xuhui Heilongjiang Univ Sch Chem & Mat Sci Harbin 150080 Heilongjiang Peoples R China Heilongjiang Acad Sci Inst Petrochem Harbin 150040 Heilongjiang Peoples R China

A facile and eco-friendly biosynthetic route for preparing Pd truncated octahedrons (PdTOs) using firmiana simplex leaf extract was reported without any chemical reducing agents. The information of reducing components, reduction process and time were obtained by ATR-FTIR imaging, FTIR and UV-Vis spectroscopy, respectively. TEM image revealed that more than 75% of PdNPs were composed of PdTOs with an average diameter of 9.2 nm. HR-TEM analysis demonstrated that a single PdTO consisted of the mix of {100} and {111} crystal planes. SAED and XRD pattern confirmed the well crystalline nature of fcc structured PdTOs. The model reactions of electro-oxidation of methanol and reduction of p-nitrophenol (p-NP) were adopted to explore the effects of structure and size of PdNPs on the catalytic properties. In the electro-oxidation of methanol, the forward-scan peak current density (If) of PdTOs was 10.05 mA cm-2, 6.3 times and 1.9 times of PdNPs-0 and PdNPs-4:1, illustrating its superior electro-catalytic property to that of spherical PdNPs. In the p-NP reduction reaction, the apparent rate constant (Ka) over PdTOs was 0.358 min-1, higher than spherical PdNPs-0 (0.08 min-1) with the similar particle size and lower than the same spherical PdNPs-4:1 (0.562 min-1) and commercial Pd/C (0.415 min-1), which all about half the size of PdTOs. It has been demonstrated that electro-chemical oxidation of methanol was a structure-sensitive reaction, while the reduction of p-NP was mainly dependent on the particle size of PdNPs.

关键词： bio-synthesis electro-oxidation of methanol firmiana simplex leaf extract Pd truncated octahedrons reduction of p-nitrophenol

来源：评论

学校读者我要写书评

暂无评论

A photo-degradable BODIPY-modified Ru(ii) photosensitizer for safe and efficient PDT under both normoxic and hypoxic conditions

引用

DALTON TRANSACTIONS 2024年第8期53卷 3579-3588页

作者： peng, Yatong Da, xuwen Zhou, Wanpeng Xu, Yunli Liu, Xiulian Wang, Xuesong Zhou, Qianxiong Tech Inst Phys & Chem Chinese Acad Sci Key Lab Photochem Convers & Optoelect Mat Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Photodynamic therapy (PDT) is promising for cancer treatment but still suffers from some limitations. For instance, PDT based on O-1(2) generation (in a type-II mechanism) is heavily dependent on high oxygen concentrations and will be significantly depressed in hypoxic tumors. In addition, the residual photosensitizers after PDT treatment may cause severe side-effects under light irradiation. To solve these problems, herein a BODIPY (boron dipyrromethene)-modified Ru(II) complex [Ru(dip)(2)(tpy-BODIPY)](2+) (complex 1, dip = 4,7-diphenyl-1,10-phenanthroline, tpy = 2,2':6',2''-terpyridine) was designed and synthesized. Complex 1 exhibited both high singlet oxygen quantum yield (Phi = 0.7 in CH3CN) and excellent superoxide radical (O-2(center dot)-) generation, and thus demonstrated efficient PDT activity under both normoxic and hypoxic conditions. Moreover, complex 1 is photo-degradable in water, and greatly loses its ROS generation ability after PDT treatment. These novel properties of complex 1 make it promising for efficient PDT under both normoxic and hypoxic conditions with reduced side-effects.

关键词： Photosensitizers

来源：评论

学校读者我要写书评

暂无评论

Assessment of pharmacological effects and abuse potential of 5F-EDMB-PICA, CUMYL-PEGACLONE, and NM-2201 in mice

引用

PSYCHOPHARMACOLOGY 2025年第3期242卷 533-544页

作者： Li, Kaixi Xu, Deli Qiao, Yanling Kuai, Lixin Luo, xuwen Di, Bin Xu, peng China Pharmaceut Univ Sch Pharm Nanjing 210009 Peoples R China Off China Natl Narcot Control Commiss Pharmaceut Univ Joint Lab Key Technol Narcot Contr Beijing 100193 Peoples R China Minist Publ Secur Drug Intelligence & Forens Ctr Key Lab Drug Monitoring & Control Beijing 100193 Peoples R China

Rationale The newly emerging synthetic cannabinoids (SCs) 5F-EDMB-PICA, CUMYL-PEGACLONE, and NM-2201 have been observed to produce effects by activating cannabinoid type 1 (CB1) receptors. Nevertheless, the pharmacological effects and potential for abuse of these three substances remain to be studied. These substances have yet to be regulated in many countries. Objectives We investigated the safety, pharmacological effects, rewarding effects, and cannabinoid withdrawal of 5F-EDMB-PICA, CUMYL-PEGACLONE, and NM-2201. Methods This study evaluated the drug safety and the cannabinoid-specific pharmacological effects of the three substances through acute toxicity experiments (in which the LD50 of each substance was obtained) and tetrad experiments (comprising assessments of hypothermia, analgesia, locomotion inhibition, and catalepsy). Furthermore, the conditioned place preference (CPP) experiments and withdrawal experiments were conducted to evaluate the rewarding effect and cannabinoid withdrawal potential of the substances in question. Results The results demonstrated that all three drugs exhibited certain acute toxic effects and could potentially induce tetrad effects. The data were analyzed using non-linear regression, and the corresponding ED50 values and 95% confidence intervals (CI) were obtained. The rank order of potency was determined to be CUMYL-PEGACLONE > 5F-EDMB-PICA > NM-2201. In the CPP experiments, it was demonstrated that 5F-EDMB-PICA significantly induced an increase in CPP score at a dose of 0.3 mg/kg, while NM-2201 caused an increase in CPP score and a significant aversion effect at a dose of 2 and 3 mg/kg, respectively. It is noteworthy that all three types of SCs were observed to produce a significant biphasic effect, indicating that CPP scores were biphasic for all compounds. Following the administration of the CB1 receptor antagonist rimonabant, a notable increase in head twitches and paw tremors was observed, indicating that these three SCs indu

关键词： 5F-EDMB-PICA CUMYL-PEGACLONE NM-2201 Acute toxicity Tetrad effects CPP Withdrawal

来源：评论

学校读者我要写书评

暂无评论

Comparative analysis of three heating methods for natural gas hydrate production: Electric heating, steam injection, and hot water injection

引用

APPLIED THERMAL ENGINEERING 2025年 269卷

作者： Zhang, Zhaobin Xu, Tao Li, Shouding Guo, peng Li, Xiao Lu, Cheng Sun, Yiming Wang, Pingkang Qin, xuwen Chinese Acad Sci Inst Geol & Geophys Key Lab Deep Petr Intelligent Explorat & Dev Beijing 100029 Peoples R China Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China China Geol Survey China Aero Geophys Survey & Remote Sensing Ctr Nat Beijing 100083 Peoples R China Minist Nat Resources China Geol Survey Oil & Gas Resources Survey Beijing 100083 Peoples R China Natl Engn Res Ctr Gas Hydrate Explorat & Dev Guangzhou 510075 Guangdong Peoples R China

Natural gas hydrates are a promising and environmentally sustainable energy resource, but their commercial production remains challenging. External heating is crucial for improving production efficiency. In this study, we employed a self-developed simulator (IGG-hydrate) to compare the thermal performance of three key heating methods: electric heating (EH), steam injection (SI), and hot water injection (WI). Quantitative indicators, including heating and depressurization thresholds, were introduced to assess the effectiveness of each method. The results demonstrate that external heating significantly facilitates hydrate dissociation, with electric heating and steam injection showing comparable gas production rates and early-stage efficiency. However, both electric heating and steam injection methods can cause localized overheating near injection wells, leading to energy inefficiency. In contrast, hot water injection achieves a more uniform temperature distribution and a broader heating range, while avoiding excessive temperature rise. However, it also reduces depressurization efficiency and increases subsidence near the wells. To optimize performance, we propose a steam-water alternating injection strategy: steam is injected initially for rapid dissociation near the wells, followed by hot water injection to extend the heating range and maintain thermal efficiency with the same equipment.

关键词： Heating method Electric heating Steam injection Hot water injection Hydrate

来源：评论

学校读者我要写书评

暂无评论

Nitroreductase-responsive photosensitizers for selective imaging and photo-inactivation of intracellular bacteria

引用

CHEMISTRY-A EUROPEAN JOURNAL 2024年第16期30卷 e202303766-e202303766页

作者： Zhou, Wanpeng Da, xuwen Jian, Yao peng, Yatong Liu, Xiulian Xu, Yunli Wu, Yao Wang, Xuesong Zhou, Qianxiong Chinese Acad Sci Tech Inst Phys & Chem Beijing 100190 Peoples R China Univ Chinese Acad Sci Beijing 1000490 Peoples R China

Intracellular Staphylococcus aureus (S. aureus), especially the methicillin resistant staphylococcus aureus (MRSA), are difficult to detect and eradicate due to the protection by the host cells. Antibacterial photodynamic therapy (aPDT) offers promise in treating intracellular bacteria, provided that selective damage to the bacteria ranther than host cells can be realized. According to the different nitroreductase (NTR) levels in mammalian cells and S. aureus, herein NTR-responsive photosensitizers (PSs) (T)CyI-NO2 were designed and synthesized. The emission and 1O2 generation of (T)CyI-NO2 are quenched by the 4-nitrobenzyl group, but can be specifically switched on by bacterial NTR. Therefore, selective imaging and photo-inactivation of intracellular S. aureus and MRSA were achieved. Our findings may pave the way for the development of more efficient and selective aPDT agents to combat intractable intracellular infections. Two nitroreductase (NTR)-responsive photosensitizers ((T)CyI-NO2) were designed and synthesized. The quenched fluorescence and singlet oxygen production of (T)CyI-NO2 can be switched on by NTR in S. aureus. Detailed studies displayed TCyI-NO2 was able to selectively image and efficiently photo-inactivate intracellular bacteria with little cytotoxicity. image

关键词： Antibacterial photodynamic therapy Intracellular bacteria treatment Nitroreductase responsive Photosensitizer Staphylococcus aureus

来源：评论

学校读者我要写书评

暂无评论

Pharmaco-toxicological effects of the synthetic cannabinoids 4F-ABUTINACA, SDB-005, and JWH-018 in mice. In vitro and in vivo studies

引用

EUROPEAN JOURNAL OF PHARMACOLOGY 2025年 996卷 177586页

作者： Luo, xuwen Kuai, Lixin Shi, Xuesong Qiao, Yanling Li, Kaixi Xu, Deli Di, Bin Yan, Fang Xu, peng China Pharmaceut Univ Sch Pharm Nanjing 210009 Peoples R China China Pharmaceut Univ Joint Lab Key Technol Narcot Control Off China Natl Narcot Control Commiss Beijing 100193 Peoples R China Minist Publ Secur Drug Intelligence & Forens Ctr Key Lab Drug Monitoring & Control Beijing 100193 Peoples R China

Background: Synthetic cannabinoids (SCs) are currently one of the most severely abused new psychoactive substances in the world. However, there remains a notable lack of pharmacological data on the newly emerged synthetic cannabinoids. In the present study, the in vitro and in vivo pharmacological effects of the fourth-generation synthetic cannabinoids 4F-ABUTINACA and SDB-005 are determined and compared to those of the first-generation synthetic cannabinoid JWH-018. Methods: In this study, the affinities of three SCs for CB1 receptors were evaluated using surface plasmon resonance (SPR) experiments. The acute toxicity of these three SCs was assessed through the up-and-down procedure, while their cannabinoid-specific pharmacological effects were determined through tetrad assays, which examined parameters such as temperature regulation, analgesia, locomotor activity, and catalepsy. Additionally, conditioned place preference (CPP) experiments and a precipitated withdrawal tests were conducted to assess the psychoactive effects and physical dependence of the SCs. Results: SPR experiments and acute toxicity tests demonstrated that in vitro KD values were positively correlated with in vivo ED50 potency estimates. All SCs were found to induce the classical "tetrad effects" in a dose-dependent manner. Notably, all SCs displayed significant biphasic effects in CPP experiments. Following the administration of the CB1 receptor antagonist rimonabant, a significant increase in head twitches and paw tremors was observed, indicating that the physical dependence manifested after the ingestion of SCs is mediated by the CB1 receptor. Conclusions: These findings suggest that these SCs have cannabinoid-specific pharmacological effects and abuse potential, providing robust experimental data to support future regulatory efforts.

关键词： 4F-ABUTINACA SDB-005 JWH-018 Tetrad CPP Precipitated withdrawal

来源：评论

学校读者我要写书评

暂无评论

IVDETR: A Multi-Source Image Pig Detection Method Based on Cross-Domain Feature Fusion 7

IVDETR: A Multi-Source Image Pig Detection Method Based on C...

引用

7th International Conference on Pattern Recognition and Artificial Intelligence, PRAI 2024

作者： Song, Rui Li, Hao Huang, Mengzhen Huang, Zihan Li, peng He, xuwen Wuhan Polytechnic University School of Mathematics and Computer Science Wuhan China

ISBN: (纸本)9798350350890

In large-scale centralised pig farming, object detection algorithms can accurately track and monitor each pig. However, a significant proportion of current detection methods are based on visible images, and the colour differences between different pig breeds limit the applicability of the models. Furthermore, complex background interference, low illumination conditions, or high illumination intensity noise in visible scenes can likewise lead to reduced accuracy during detection. Therefore, we propose a cross-domain encoder based on the self-attention and design the IVDETR model, which integrates features from infrared and visible light images for pig object detection. In order to facilitate the training and evaluation of the model, we constructed a comprehensive, standardised infrared-visible light dataset for the first time. The experimental outcomes demonstrated that the detection accuracy was increased from 0.939 to 0.998 in a real pig breeding environment. © 2024 IEEE.

关键词： Mammals

来源：评论

学校读者我要写书评

暂无评论

Controlled Anodic Decomposition Pathway of Supramolecular Lithium Borate for Rationally Tuned Interphase Chemistry

引用

Angewandte Chemie 2025年

作者： Haiyu Zhou Wenhui Hou Da Zhu Pan Zhou xuwen peng Zhi Liu Shuaishuai Yan Yang Lu Yu Ou Fengxiang Liu Yingchun Xia Hao Liu Qingbin Cao Xuan Song Decai Guo Hong Xu Kai Liu The State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 P.R. China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 P.R. China Dalian Research Institute of Petroleum and Petrochemicals SINOPEC No.96 Nankai Road Tieshan Street Lvshunkou District Dalian Liaoning 116045 P.R. China

The rational tailoring and molecular-level engineering of stable cathode-electrolyte interphases (CEIs) is paramount to advancing the performance of next-generation high-energy, layered nickel-rich oxide-based lithium metal batteries. However, developing well-tailored electrolyte additives with rationally controlled interfacial chemistry remains highly challenging. Here, two lithium borates: lithium (2-methoxy-15-crown-5)trifluoroborate (C-LiMCFB) and lithium (15-methoxy-2,5,8,11,14-pentaoxahexadecan)trifluoroborate (L-LiMCFB), incorporating cyclic 15-crown-5 (15C5) and linear pentaethylene glycol monomethyl ether (PEGME) as respective host groups tethered to the boron center are designed and synthesized. In C-LiMCFB, the supramolecular polydentate chelation/de-chelation of the 15C5 with Li + can sequentially deactivate/activate the anodic decomposition of the C─O bonds, therefore leading to the controlled cleavage pathway of B─O and C─O bonds. The controlled interfacial chemistry leads to the formation of a uniform CEI layer, rich in lithium boron–oxygen clusters interwoven with LiF, on the NCM811 surface. This novel CEI configuration demonstrates an exceptional balance of mechanical robustness, adhesiveness, and toughness, providing highly desirable protection for the NCM811 cathode. The discovery of these novel supramolecular boron-based lithium salts not only unlocks supramolecular chemistry for rational electrolyte tuning but also provides a deeper understanding of the CEI formation mechanism in high-energy lithium metal batteries.

关键词： Battery electrolytes Energy storage Lithium metal batteries Supramolecular chemistry

来源：评论

学校读者我要写书评

暂无评论

Seabed erosion and deposition formulas applied to a 2D hydrodynamic harbor engineering simulation

引用

ARABIAN JOURNAL OF GEOSCIENCES 2022年第6期15卷 1-19页

作者： Li, Yuting Fang, xuwen Li, Ruijie Song, Zhiyao peng, Guoqiang Chen, peng Nanjing Normal Univ Key Lab Virtual Geog Environm Minist Educ PRC Nanjing 210023 Peoples R China Nanjing Normal Univ State Key Lab Cultivat Base Geog Environm Evolut Nanjing 210023 Peoples R China Nanjing Normal Univ Jiangsu Ctr Collaborat Innovat Geog Informat Reso Nanjing 210023 Peoples R China Xiamen Univ Coll Ocean & Earth Sci Xiamen 361102 Peoples R China Hohai Univ Key Lab Coastal Disaster & Def Minist Educ Nanjing 210098 Peoples R China Hohai Univ Coll Oceanog Nanjing 210098 Peoples R China Hohai Univ Coll Harbour Coastal & Offshore Engn Nanjing 210098 Peoples R China Shaanxi Normal Univ Sch Geog & Tourism Xian 710062 Peoples R China

In coastal engineering, predicting seabed erosion and deposition can help understand hydrodynamic changes of the coastal area. The present work aims to address the prevalent challenge that there is often a shortage of measured data in coastal areas. In this paper, a new seabed erosion and deposition formula with four forms is proposed and combined with 2D hydrodynamic harbor engineering simulation of Daishan Island situated in Zhejiang province, China. The simulation shows that (1) in the open channel, the proposed new formula considers the friction coefficient before and after trenching, thus providing a more accurate prediction result;(2) in the sheltered channels, the proposed new formula can roughly estimate the deposition intensity;(3) in the basin entrance, the proposed new formula provides an estimation better aligned with reality than existing formulae. Meanwhile, the recovery saturation coefficient is not a constant;it can be set at 0.31 in the obtained formulas for calculations during the back silting, and at 0.11 during scouring. Therefore, the proposed new formula provides an improved solution to prediction of seabed erosion and deposition and is applicable to Daishan coastal area in different situations.

关键词： Tidal current and sediment Channel deposition Seabed erosion and deposition Erosion and deposition formula

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：