Neural Regeneration Research
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2013
·
IF 0.144
Yi Zhang,Shu Zhao,Weiren Dong,Suifen He,Haihong Wang,Lihua Zhang,Yinjuan Tang,Jiasong Guo,Suiqun Guo
The sonic hedgehog protein not only plays a key role in early embryonic development, but also has essential effects on the adult nervous system, including neural stem cell proliferation, differentiation, migration and neuronal axon guidance. The N-terminal fragment of sonic hedgehog is the key functional element in this process. Therefore, this study aimed to clone and analyze the N-terminal fragment of the sonic hedgehog gene. Total RNA was extracted from the notochord of a Sprague-Dawley rat at embryonic day 9 and the N-terminal fragment of sonic hedgehog was amplified by nested reverse transcription-PCR. The N-terminal fragment of the sonic hedgehog gene was successfully cloned. The secondary and tertiary structures of the N-terminal fragment of the sonic hedgehog protein were predicted using Jpred and Phyre online.
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APPLIED SURFACE SCIENCE
·
2014
·
IF 2.538
Yanlin Zhang,Peihong Liu,Honghai Wu
One-dimensional (1D) nanowire material (especially nonmetal doped 1D nanowires) synthesized by a facile way is of great significance and greatly desired as it has higher charge carrier mobility and lower carrier recombination rate. N, S-codoped TiO 2 nanowires were synthesized using titanium sulfate as a precursor and isopropanol as a protective capping agent by a hydrothermal route. The obtained doped nanowires were characterized by XRD, SEM, HRTEM, SAED, XPS, BET and UV–vis absorption spectrum. The incorporation of N and S into TiO 2 NWs can lead to the expansion of its lattice and remarkably lower its electron-transfer resistance. Photocatalytic activity measurement showed that the N, S-codoped TiO 2 nanowires with high quantum efficiency revealed the best photocatalytic performance for atrazine degradation under visible light irradiation compared to N, S-codoped TiO 2 nanoparticles and S-doped TiO 2 nanowires, which was attributed to (i) the synergistic effect of N and S doping in narrowing the band gap, separating electron–hole pairs and increasing the photoinduced electrons, and (ii) extending the anatase-to-rutile transformation temperature above 600 °C.
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INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
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2014
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IF 2.216
Jian-Xiong Li,Lei Liu,An-Hua Liu
N-substituted diazabicyclononanes with different benzylic substituents were synthesized by hydrogenating diazabicyclononene with LiAlH 4 and alkylating secondary amine with halobenzyl derivatives. The synthesized diazabicyclononanes were identified with NMR spectrometry ; the UV absorption and fluorescence emission of the diazabicyclononanes were examined with spectroscopes; the reactivity of the diazabicyclononane as radical photoinitiator and photolatent base were evaluated with DSC , FTIR spectroscope and gel fraction determination; the effects of substituents on the photoactivities of the diazabicyclononanes were investigated. Electron conjugation in the substituents played a prominent role on the photoactivity. As the conjugation extended, the extinction coefficient increased and fluorescence decreased; meanwhile, the UV absorption expanded towards low frequency. For diazabicyclononane N-substituted with 4-methylene benzophenone, the maximum absorption appeared around 256 nm with extinction coefficient 1.78×10 4− mol −1 L cm −1 . It could work as radical photoinitiator and photolatent base simultaneously. With this diazabicyclononane, epoxy acrylate could be UV cured within seconds and the activation temperature of epoxy/anhydride could be reduced 50 °C after UV excitation. The gel fraction of acrylate/epoxy hybrid resins could be about 90% after UV-thermal dual curing.
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Journal of Physical Chemistry C
·
2013
·
IF 4.814
Zhiqiao He,Yuanqiao Shi,Chao Gao,Lina Wen,Jianmeng Chen,Shuang Song
A novel visible-light-active BiOCl/BiVO4 photocatalyst with a p–n heterojunction structure was prepared using a hydrothermal method. The photocatalytic activity of the heterojunction was investigated by monitoring the change in methyl orange (MO) concentration under visible-light irradiation. The results reveal that the composite exhibited markedly improved efficiency for MO photodegradation in comparison with pure BiVO4, BiOCl, and Degussa P25. This is ascribed to the B-type heterojunction structure with a strong oxidative ability and efficient charge separation and transfer across the BiOCl/BiVO4 p–n junction. The highest activity was obtained in the BiOCl/BiVO4 heterojunction using a composite of 13 mol % BiOCl and 87 mol % BiVO4. The removal of MO was mainly initiated by valence-band holes, but dissolved oxygen also played a crucial role in consuming the conduction-band electrons. This was verified by the effects of scavengers and N2 purging.
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COMBUSTION SCIENCE AND TECHNOLOGY
·
2013
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IF 1.011
Ming-Di Li,Zhong Wang,Yang Zhao,Rui-Na Li,Shuai Liu
An experimental study was reported on premixed ethanol/n-heptane/oxygen/argon flames at low pressure (4.655 kPa) with ethanol blending ratios of 0 (Flame 1), 15% (Flame 2), and 30% (Flame 3). The equivalence ratio was 1.0. Flame species were identified using molecular beam mass spectrometry with tunable synchrotron photoionization. The flame temperature profiles were measured with a Pt-6%Rh/Pt-30%Rh thermocouple. The mole fraction profiles of major and intermediate flame species under different ethanol ratios were analyzed in this article. Experimental results showed that the temperature profiles of measured flames fall almost on a single curve, which means that ethanol had little effect on flame temperature. The peak mole fraction of the main combustion products occurred 2–6 mm above the burner. With the increase of ethanol blending ratios, the mole fractions of H2, CO, and CO2 decreased, the mole fraction of H2O increased, and the mole fractions of intermediate combustion products (C2H2, C2H4, HCHO, C3H3) decreased. During the combustion process, the oxygen atom of ethanol partly replaces the O2, thus the final mole fraction of O2 increased with the increase of ethanol ratios.
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Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 30
·11768-11775
·
IF 0
Yi Yao,Hui Xiao,Peng Wang,Panpan Su,Zhigang Shao,Qihua Yang
The development of non-precious metal catalysts for oxygen reduction reactions (ORRs) is of extreme importance for the construction of efficient H2/O2 polymer electrolyte membrane fuel cells (PEMFCs), one of the most promising clean energy technologies. Herein, we report the fabrication of core–shell structured CNTs@Fe–N–C composites with a Fe–N–C shell closely wrapped around a core of CNTs (carbon nanotubes) as efficient catalysts for ORR. CNTs@Fe–N–C composites afford comparable activity to commercial Pt/C catalysts with a loading of 20 μg Pt cm−2 towards ORR in alkaline media. The results of XRD, TEM, XPS and 57Fe Mössbauer characterizations suggest that the high ORR activity of CNTs@Fe–N–C composites are mainly attributed to the combined advantages of the unique core–shell nanostructure allowing close contact between Fe–N–C and CNTs, uniformly distributed FeN4/C species, and the presence of pyridine and graphitic nitrogen.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 8
·B102
·
IF 2.588
Qian Han,Yonghua Wang,Yihan Huang,Liju Guo,Yingzi Fu
In the present study, a novel approach was designed to construct a reagentless chiral biosensor for highly selective recognition of N-isobutyryl-cysteine enantiomers. The reduced-graphene oxide sheets (rGO) and thionine (TH) were firstly stepwisely synthesized onto modified glassy carbon electrode using glutaraldehyde as a bifunctional reagent, and γ-globulin was adsorbed on the electrode surface as a chiral selector. TH-rGO with excellent redox electrochemical activities brought in more redox probes for chiral recogniton, which could improve the sensitivity of the biosensor. Good reproducibility and sufficient stability were obtained with the advantages of TH-rGO and glutaraldehyde reagent. Moreover, the proposed biosensor showed an obviously decreased current peak after adsorption of N-isobutyryl-L-cysteine isomer. As compared with penicillamine or cysteine enantiomers, the current biosensor showed good enantioselectivity for sensing N-isobutyryl-cysteine enantiomers.
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Reaction Kinetics Mechanisms and Catalysis
·
2014
·Vol. 113
·期 1
·281-292
·
IF 0.983
Huang Ji-guo,Zheng Meng-yang,Pang Shuo,Liu Li-guo,Zhao Xiao-guang,Dong Li-li,Liu Xing-juan
N–Si co-doped TiO 2 nanoparticles for the photodegradation of phenol were prepared by SiCl 4 and TiCl 4 co-hydrolysis and the effect of H 2 O 2 modification was studied. The characterization results revealed that the Si doped into the TiO 2 lattice was limited and the redundant silicon existed in segregated amorphous silica. The average crystallite size of the photocatalysts reduced from 14.8 to 5.5 with increasing Si doping ratio. The absorption edges of the as-prepared samples got an obvious red shift in which the best one reached 526 nm. N and Si co-doped into the photocatalysts replaced Ti and formed the Ti–O–Si and O–Ti–N link-ages. The photocatalysts modified by H 2 O 2 were well dispersed and changed the molecular structure. The degradation effect of the used Si doped photocatalysts was better than for undoped photocatalysts, and the H 2 O 2 modification could not further enhance the photocatalytic activity for N–Si doped TiO 2 . For the photodegradation of phenol, the optimal molar ratio of Si/Ti and the calcination temperature was 1:4 and 650 °C, respectively. For the optimal photocatalyst, the molar ratios of O/Ti, N/Ti, and Si/Ti were 0.54, 0.19, 0.29, and the phenol removed 94.4 % in 6 h under solar light. The reusability of N–Si co-doped TiO 2 was relatively good.
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ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Kai Jiang,Shan Sun,Ling Zhang,Yuhui Wang,Congzhong Cai,Hengwei Lin
Fluorescent carbon dots (CDs) have attracted much attention in recent years because of their superior optical and chemical properties, thus demonstrating many potential applications. However, the previously reported CDs mostly show strong emission only in the blue-light region, and the long-wavelength (i.e., yellow- to red-light) emissions are usually very weak. Such a drawback restricts their further applications, particularly in the biology-relevant fields. Herein, a rare example of N-doped CDs that emit bright-yellow fluorescence (i.e., y-CDs) is reported using 1,2,4-triaminobenzene as carbon precursor. The as-prepared y-CDs exhibit not only respectable emission quantum yield and highly optical stabilities but superior biocompatibility and biolabeling potentials. In addition, the y-CDs are found to show an interesting “ON–OFF–ON” three-state emission with the stepwise addition of Ag+ and cysteine (Cys), indicating potential applications as a bifunctional sensing platform. Thanks to the highly intense emission of y-CDs, the gradual quenching and restoration of their fluorescence with the addition of Ag+ and further Cys could also be observed with the naked eye. More importantly, the ensemble of the y-CDs and Ag+ demonstrates practicability for the highly selective and sensitive detection of Cys in human plasma samples with satisfactory results.
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2014
·Vol. 32
·期 5
·410-416
·
IF 1.04
Chunhai Liu,Qihui He,Zheng Zhang,Yangyang Su,Renfu Xu,Baixing Hu
Four BrØsted acid ionic liquids (ILS) [MMP][DMP], [MEP][DEP], [HMP][DMP] and [HEP][DEP] were synthesized and used as extractants for desulfurization of aromatic sulfur compounds in model oil. The mutual solubility of four ILs were investigated. The extraction equilibrium of four ILs could be reached in as soon as 5 min and the extraction capability followed the order [MMP][DMP]>[MEP][DEP]>[HEP][DEP]>[HMP][DMP]. The S extraction showed the highest efficiency under the conditions of 30°C, 30 min and 1:1 ( V / V ) IL:oil. Under the optimal condition, 70.9% of thiophene (TS), 76.9% of benzothiophene (BT) and 87.5% of dibenzothiophene (DBT) in n -octane could be efficiently removed by [MMP][DMP]. The multiple extraction and regeneration performance of [MMP][DMP] for TS was also investigated and the results were satisfying. These results suggest that [MMP][DMP] has the best extraction capability and can serve as a promising solvent for extractive desulfurization of fuel oils.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yan Cao,Zipeng Xing,Yingcai Shen,Zhenzi Li,Xiaoyan Wu,Xu Yan,Jinlong Zou,Shilin Yang,Wei Zhou
Mesoporous black Ti 3+ /N-TiO 2 spheres with high crystallinity are fabricated by a facile evaporation-induced self-assembly (EISA) method, using urea as nitrogen resource, combined with a mild calcinations (350 °C) after an in-situ hydrogenation under an argon atmosphere. The prepared materials are characterized by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results indicate the prepared sample is uniform mesoporous black Ti 3+ /N-TiO 2 spheres with high crystallinity of anatase, high surface area of ∼100 m 2 g −1 , large pore size of 6.5 nm and narrow band gap of 2.11 eV, could be easily controlled with the diameter from 200 to 800 nm. Meanwhile, the photoresponse extends to near-infrared region owing to Ti 3+ and N codoping. The visible-light-driven photocatalytic degradation ratio of methyl orange is up to 96% and photocatalytic hydrogen production rate is ∼150 μmol h −1 , which are several times higher than that of pristine TiO 2 . Besides, the possible photocatalytic mechanism is proposed. The excellent photocatalytic activity can be ascribed to N and Ti 3+ doping resulting in high visible light utilization and enhanced separation of photogenerated charge carriers, and the mesoporous networks offering more surface active sites.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Tingting Hou,Chaofeng Zhang,Yehong Wang,Zhenting Liu,Zhixin Zhang,Feng Wang
A metal-free and efficient approach to N -arylpyrrolidines from arylamines and cyclic ethers catalyzed by hydrogen iodine is described. In this protocol, no additive is added and a wide range of N -arylpyrrolidines are synthesized with up to 99% yield. Reaction mechanism involving iodine radical is proposed.
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