通讯机构：
[Lin, Ying-Wu] U;Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;Univ South China, Lab Prot Struct & Funct, Hengyang 421001, Peoples R China.
摘要：
Neuroglobin (Ngb), with its physiological role not fully understood, was found to be capable of self-oxidation of methionine64 introduced at the heme axial position (H64M Ngb), adopting a high-spin heme state and producing both methionine sulfoxide (SO-Met) and sulfone (SO2-Met), which represents the structure and function of cytochrome c in a non-native state.
作者机构：
[Lu, Yunfeng; Shen, Li; Wang, Xiaofeng; Liu, Fang; Wu, Hao Bin] Univ Calif Los Angeles, Dept Chem & Biomol Engn, Los Angeles, CA 90095 USA.;[Wu, Hao Bin] Zhejiang Univ, Sch Mat Sci & Engn, Hangzhou 310027, Peoples R China.;[Zink, Jeffrey I.; Brosmer, Jonathan L.] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA.;[Wang, Xiaofeng] Univ South China, Sch Chem & Chem Engn, Hengyang 421001, Peoples R China.;[Cai, Mei; Xiao, Qiangfeng] Gen Motors Res & Dev Ctr, 30500 Mound Rd, Warren, MI 48090 USA.
通讯机构：
[Lu, Yunfeng; Wang, Ge; Dunn, Bruce] U;Univ Calif Los Angeles, Dept Chem & Biomol Engn, Los Angeles, CA 90095 USA.;Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.;Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA.
关键词：
biomimetic ionic channels;lithium-ion electrolyte;lithium-metal batteries;metal–organic frameworks;open metal sites
通讯机构：
[Wang, Hongqing] U;Univ South China, Coll Chem & Chem Engn, 28 Changsheng West Rd, Hengyang 421001, Hunan, Peoples R China.
关键词：
Aluminum ions;Cell imaging;Fluorescence probe;Schiff's base
摘要：
<![CDATA[<ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="ab0005" xml:lang="en" view="all" class="author"><ce:section-title id="st0005">Abstract</ce:section-title><ce:abstract-sec id="as0005" view="all"><ce:simple-para id="sp0080" view="all">A reversible Schiff's base fluorescence probe for Al<ce:sup loc="post">3+</ce:sup>, (3,5-dichloro-2- hydroxybenzylidene) quinoline-2-carbohydrazide (<ce:bold>QC</ce:bold>), based on quinoline derivative has been designed, synthesized and evaluated. The<ce:bold>QC</ce:bold>exhibited a high sensitivity and selectivity toward Al<ce:sup loc="post">3+</ce:sup>in EtOH-H<ce:inf loc="post">2</ce:inf>O (v/v=1:9, pH=6) by forming a 1:1 complex with Al<ce:sup loc="post">3+</ce:sup>and the detection limit of<ce:bold>QC</ce:bold>for Al<ce:sup loc="post">3+</ce:sup>was as low as 0.012μM. Furthermore, these results displayed that the binding of<ce:bold>QC</ce:bold>Al<ce:sup loc="post">3+</ce:sup>was broken by F<ce:sup loc="post">?</ce:sup>, so this system could be used to monitor F<ce:sup loc="post">?</ce:sup>in the future. The enhancement fluorescence of the<ce:bold>QC</ce:bold>could be attributed to the inhibition of PET and ESIPT and the emergency of CHEF process induced by Al<ce:sup loc="post">3+</ce:sup>. More importantly,<ce:bold>QC</ce:bold>was not only successfully used for the determination of trace Al<ce:sup loc="post">3+</ce:sup>in the tap water and the human blood serum, but was valid for fluorescence imaging of Al<ce:sup loc="post">3+</ce:sup>in the Hela cells.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="ab0010" class="graphical" xml:lang="en" view="all"><ce:section-title id="st0010">Graphical Abstract</ce:section-title><ce:abstract-sec id="as0010" view="all"><ce:simple-para>Display Omitted</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:c
摘要：
In this paper, we synthesized and characterized a di-tetradentate macrocyclic ligand as a novel resonance fluorescence probe for the determination of uranium. The ligand contains two tetradentate ligand moieties and can chelate two cations to form binuclear complex. We found that when the ligand only chelates a uranyl ion or europium (III) ion, the formed complex can only produce weak resonance fluorescence. When the ligand chelates simultaneously uranyl and europium (III) to form heterobinuclear complex, the formed complex can produce strong resonance fluorescence due to the cation-cation interaction between uranyl and europium (III). Based on this finding, we established a resonance fluorescence chemosensor for the determination of uranium (VI) by utilizing the formation of the heterobinuclear complex. Under optimal conditions, the linear range for the determination of uranium (VI) is 0.008-1.2 nmol mL(-1) with a detection limit of 0.002 nmol mL(-1). The method has been applied to determine uranium (VI) in environmental water samples with the recoveries between 95.7% and 103.6%. (C) 2018 Elsevier B.V. All rights reserved.
摘要：
The wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer influences the performance of the proton exchange membrane fuel cell. In this paper, cathode catalyst layer with different polytetrafluoroethylene contents are prepared, and the effect of hydrophobic-hydrophilic balance on the performance of the membrane electrode assembly is investigated intensively. It is found that wettability, or hydrophobic-hydrophilic balance, of cathode catalyst layer can significantly affect the performance of membrane electrode assembly, and it can be effectively tuned by varying the loading of polytetrafluoroethylene. With the addition of polytetrafluoroethylene, the hydrophobicity of cathode catalyst layer, reflected by the contact angel, can be changed from 135.6 degrees of that without addition of polytetrafluoroethylene to 146.5 degrees with 70 wt.% polytetrafluoroethylene addition, and the optimal addition amount is 50 wt.%. For our optimal membrane electrode assembly with optimal addition of polytetrafluoroethylene in cathode, its current density are recorded as 990 mAcm(-2) at 0.7 V and 1400mA cm(-2) at 0.6 V, respectively; its maximum power density is up to 856mWcm(-2). Furthermore, our polytetrafluoroethylene-incorporated membrane electrode assembly also exhibits excellent stability, and current density only drops from 1000mA cm(-2) to 900mA cm(-2) after a continuous operation of 60 h. (C) 2018 Elsevier Ltd. All rights reserved.
期刊：
American Journal of Biochemistry and Biotechnology,2018年14(2):145-153 ISSN：1553-3468
通讯作者：
Ding, De-Xin(dingdxzzz@163.com)
作者机构：
[Cao, Yun-Chang; Hu, Nan; Wang, Yong-Dong; Li, Gaung-Yue; Ding, De-Xin] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, 28 West Changsheng Rd, Hengyang;Hunan;421001, China;[Wen, Hong-Bo] Department of Biochemistry and Molecular Biology, School of Pharmaceutical and Biological Science, University of South China, 28 West Changsheng Rd, Hengyang;[Cao, Yun-Chang; Wen, Hong-Bo; Hu, Nan; Wang, Yong-Dong; Li, Gaung-Yue; Ding, De-Xin] Hunan
通讯机构：
[Ding, D.-X.] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, 28 West Changsheng Rd, Hengyang, Hunan, China
摘要：
The design of functional metallohydrogels is attractive but challenging. A rational approach is introduced for designing functional metallohydrogels using chiral ligands, a phenylalanine derivative with a pyridyl group (l/d-PF). Intriguingly, the as-prepared metallohydrogel exhibits excellent O2 binding and activating properties. Insights into the O2 binding pathway reveals the presence of a novel [(l+d)-PF-Cu3+-O2−] species, which can efficiently reduce ferric cytochrome c with the reactive O2− by receiving an electron from reductant ascorbic acid. This study provides helpful instructions for developing new artificial systems with specific functions through the effective combination of chiral ligands with metal ions.
作者机构：
[王孟] School of Nuclear Science and Technology, University of South China, Hengyang;421001, China;[Shan, Decai; 廖云; 刘芝芳] School of Chemistry and Chemical Engineering, University of South China, Hengyang;[王孟; Shan, Decai; 廖云; 刘芝芳] 421001, China
通讯机构：
[Wang, M.] S;School of Nuclear Science and Technology, University of South China, Hengyang, China
摘要：
The inelastic responses of thermoplastic polyurethane/attapulgite (AT) elastomeric composites were studied by an elastic-testing machine combining with an infrared camera during loading–unloading cycles, in which the former detected the mechanical properties while the latter reflected the thermal effects of deformation. For both unfilled and filled polyurethanes, some significant inelastic features were noticed that in the first cycle hysteresis and most stress softening occurred, and the corresponding temperature variation was partly reversible. However, in the following cycles, the specimen approached a steady state, therefore, stress–strain curve and the corresponding temperature variation was totally reversible. It was also showed that in filled materials the inelastic effects were becoming more obvious with the increase of AT concentration. The results can be explained by chain slippage of the hard micro-domain existing in soft segments of polyurethane, which produces irreversible friction dissipation during the initial loading process.
摘要：
The inclusion complex (sulfated-β-CD@NAA) of sulfated β-cyclodextrin and α-naphthylacetic acid was synthesized for adsorption of low concentrations of thorium from aqueous solutions. The structure and property of sulfated-β-CD@NAA were characterized by Fourier transform infrared spectroscopy, thermogravimetric, X-ray diffraction, proton nuclear magnetic resonance, specific surface area measurement and scanning electron microscopy. The characterization analysis confirmed the formation of new solid phase. The results indicated that α-naphthylacetic acid embedded into the cavity of sulfated β-cyclodextrin partly from the secondary face and the thermal stability of inclusion complex was significantly increased. The experiments were designed by Box–Behnken design combined with response surface methodology. The adsorption parameters of pH value, contact time, initial concentration were used as the independent variables and their effects were investigated on the Th(IV) adsorption capacity. Second-order polynomial regression models were derived and analysis of variance was utilized to judge the adequacy of the chosen models. The maximum Th(IV) adsorption capacity (12.75 mg g−1) was achieved under the following conditions: pH value 2.5, contact time 35 min, initial concentration 30 mg L−1. Prediction of models was in good agreement with experimental results. The experimental adsorption kinetic data followed a pseudo-second-order equation with the correlation of 0.9996, indicating the chemical adsorption. The obtained equilibrium isotherm data were fitted well with Langmuir model in the concentration range considered. The thermodynamic parameters (∆H0 < 0, ∆S0 < 0, ∆G0 < 0) indicated that the adsorption process was exothermic and spontaneous. Regeneration of Th(IV)-loaded sulfated-β-CD@NAA with 0.1 M HNO3 solution, and the regenerated sulfated-β-CD@NAA can be reused for adsorption of Th(IV).
摘要：
The coordination reaction of thorium (IV) with a ditopic bidentate ligand to form supramolecular polymer was studied by resonance light scattering (RLS) spectra, second-order scattering (SOS) spectra and frequency-doubling scattering (FDS) spectra, respectively. The ditopic bidentate ligand is isophthalaldehyde-tetrapyrrole (IPTP). It was synthesized through a condensation reaction of isophthalaldehyde with pyrrole. The formation of supramolecular polymer results in remarkable intensity enhancements of the three light scattering signals. The maximum scattering wavelengths of RLS, FDS and SOS were 290, 568 and 340 nm, respectively. The reaction was used to establish new light scattering methods for the determination of thorium (IV) by using IPTP as probe. Under optimum conditions, the intensity enhancements of RLS, SOS and FDS were directly proportional to the concentration of thorium (IV) in the ranges of 0.01 to 1.2 mu g mL(-1), 0.05 to 1.2 mu g mL(-1) and 0.05 to 1.2 mu g mL(-1), respectively. The detection limits were 0.003 mu g mL(-1), 0.012 mu g mL(-1) and 0.021 mu g mL(-1), respectively. The methods were suitable for analyzing thorium (IV) in actual samples. The results show acceptable recoveries and precision compared with a reference method. (C) 2017 Elsevier B.V. All rights reserved.
摘要：
Uranium was not only the main source of nuclear energy but also one of the long-lived radionuclide. Herein,a novel arginine modified hydroxyapatite carbon microsphere composites (defined as C@HAp/ Arg) obtained promptly via a one-step mild hydrothermal method,was applied to remove U(VI) from aqueous solutions. Based on the characterization of transmission electron microscopy (TEM),scanning electron microscopy (SEM),Fourier transformed infrared spectroscopy (FT-IR),X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS),the synthesized C@HAp/Arg presented globular morphology and abundant functional groups (e.g.,ACOO~-),which were beneficial to its combination with U(VI). The interaction mechanism and removal capability of U(VI) on C@HAp/Arg were studied by batch adsorption technique and spectroscopy analysis. The results implied that U(VI) can form strong surface complexes on C@HAp/Arg. The kinetics adsorption of U(VI) followed pseudo-second-order kinetic model with high removal efficiency (~95% within 5 h at pH 5.0). The adsorption isotherms were well fitted by Langmuir model,implying that U(VI) uptake on C@HAp/Arg was monolayer coverage. It was found that the maximum adsorption capacities of CSs,C@HAp and C@HAp/Arg toward U(VI) were calculated to be 23.16,72.09 and 569.66 mg/g,respectively,at 298.15 K and pH 5.0,and thermodynamic parameters revealed that the adsorption processes of U(VI) were spontaneous and endothermic. In addition,effect of co-existed ions and CO_3~(2-) concentrations demonstrated that U(VI) adsorption on C@HAp/Arg was weakly interfered by foreign ions and carbonate concentrations. More importantly,the adsorption performance of U(VI) on C@HAp/Arg was still over ~87% after five cycles. Therefore,it was noted that the versatile C@HAp/Arg could be potentially used as a powerful building block for the enrichment and disposal of U(VI) from aqueous solutions,which could efficiently reduce the potential toxicity of U(VI) in the U (VI)-contaminated water.
作者机构：
[李士伟; 梁润芬; 王国平] School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China;[刘汝宽] School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China;[李士伟; 肖志红; 李辉; 张爱华; 刘汝宽; 李昌珠] Institute of Biological and Environmental Engineering, Hunan Academy of Forestry, Changsha, 410004, China
通讯机构：
Institute of Biological and Environmental Engineering, Hunan Academy of Forestry, Changsha, China
