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There are 623 papers published in subject: since this site started. |
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1. A naphthalimide based fluorescent probe for imaging microviscosity in living cells | |||
Guo Bingpeng,Zhang Xiaoling | |||
Chemistry 24 April 2017 | |||
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Abstract:Intracellular viscosity strongly influences transportation of mass and signal, interactions between the biomacromolecules and diffusion of reactive metabolites in live cells. Herein, we developed a naphthalimide-hemicyanine based fluorescent probe Cyt-NA for imaging the change of microviscosity in living cells. Cyt-NA exhibited about 260 folds fluorescence increasing at 610 nm along with the increasing viscosity from 1.0 cP to 1410 cP. These satisfying response properties make Cyt-NA possible to monitor viscosity changes under starvation and low temperature conditions, offering us more practical information about microenviromental viscosity in living cells. | |||
TO cite this article:Guo Bingpeng,Zhang Xiaoling. A naphthalimide based fluorescent probe for imaging microviscosity in living cells[OL].[24 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4728806 |
2. Primitive path analysis of linear polymer embedded in post array | |||
HOU Jixuan | |||
Chemistry 24 April 2017 | |||
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Abstract:In this paper, we present an extensive set of simulation results for the relaxation processes of linear polymer chains embedded in post arrays using Monte Carlo algorithm. The data allow us to explore the crossover of chain dynamics from single-chain regime to entangled regime. Using primitive path analysis, the statistical information of the system, including the average value and the fluctuation of the length of primitive path, is also obtained. We have performed a clear test on Doi's theory on contour length fluctuation and we find excellent agreement for Doi's theory in entangled regime. | |||
TO cite this article:HOU Jixuan. Primitive path analysis of linear polymer embedded in post array[OL].[24 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4728664 |
3. Single Carbon Dioxide Molecules on Surfaces Studied by Low-Temperature Scanning Tunneling Microscopy | |||
WANG Yawei, LI Na, WANG Yongfeng | |||
Chemistry 21 April 2017 | |||
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Abstract:Global environmental problems induced by the rapid consummation of fossil fuels have become more and more serious. In this context, the reduction and conversion of carbon dioxide (CO$_2$) has been intensively studied because CO$_2$ is a greenhouse gas which is responsible for the global warming. This review focuses on the low-temperature scanning tunneling microscopy investigations of single CO$_2$ molecules on surfaces. We divide the supported substrates into the following categories: metal surfaces, metal oxide surfaces, and surfaces decorated by metal-organic frameworks. The single molecule study of CO$_2$ molecules helps to understand the microscopic mechanism of reduction and conversion of CO$_2$ molecules. | |||
TO cite this article:WANG Yawei, LI Na, WANG Yongfeng. Single Carbon Dioxide Molecules on Surfaces Studied by Low-Temperature Scanning Tunneling Microscopy[OL].[21 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4726508 |
4. Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for Methanol | |||
LU Leilei,DU Baozhong,YANG Rong,LIU Yuyao,LI Yukang | |||
Chemistry 20 April 2017 | |||
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Abstract:This work focused on the decontamination of polyvinylpyrrolidone(PVP) on platinum by electrochemical treatment. Pt nanocrystals were synthesized by colloidal method using chloroplatinic acid as the metal precursor and PVP K30 as a stabilizer. Spherical, cubic, octahedral and cuboctahedral Pt nanocrystals were obtained by adding different concentrations of silver nitrate to the above colloidal solution. The morphology of Pt nanocrystals was characterized by transmission electron microscope (TEM). It was found that the as-prepared Pt nanocrystals were well dispersed with a narrow size distribution. Electrochemical decontamination was applied to the Pt nanocrystals by short pulse potential step before electrocatalytic performance measurements. Repeating potential steps were set up between high voltage and low voltage. As the potential step proceeding, Pt surface sites were exposed gradually, which could be confirmed from the more and more clear hydrogen and oxygen adsorption/desorption peaks of the cyclic voltammograms (CV). The electrocatalytic activity of the electrochemically cleaned Pt nanocrystals was characterized by CV and chronoamperometry measurements. It was found that cuboctahedral Pt nanocrystals showed the best catalytic activity for methanol electrooxidation. This study put forward a simply and effective electrochemical decontamination method of the Pt surfaces capped by PVP. | |||
TO cite this article:LU Leilei,DU Baozhong,YANG Rong, et al. Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for Methanol[OL].[20 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4727458 |
5. Raman Spectroscopy a Promising Technique for Quantification and Monitoring Heat-induced Formation of Trans Fatty Acids in Oil | |||
SHI Ruyi,LIU Xiangjiang,XIE Lijuan,YING Yibin | |||
Chemistry 18 April 2017 | |||
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Abstract:Trans fatty acids (TFAs), a type of unsaturated fatty acids that have been widely used in the food industry, have drawn considerable attention recently since consumption of TFAs significantly increased the risk of coronary heart disease, diabetes, etc. Thus, efficient and reliable detection methods for TFAs are of great importance both in industrial applications and for research purposes. In this paper, we developed a rapid and pretreatment-free quantification approach for TFA in oils using Raman spectroscopy together with some chemometric methods. The results show that the concentration of TFA in various oils can be well predicted based on the Raman spectral features in the region of 1640 - 1680 cm-1 (characteristic to C=C stretching modes), yielding a root mean square error of prediction (RMSEP) equal to 0.47%. Furthermore, in order to understand heat-induced formation of TFA during food preparation, we investigated the TFA's concentrations of the oil heated under different temperatures based on the above predication model. The result indicates its concentration increased sharply when the heating temperature exceeded 169 ℃. All these results suggest that Raman spectroscopy is a promising tool for quantification of TFAs, offering the benefit of avoiding time-consuming, costly, sample pretreatments and laborious chemical analysis. | |||
TO cite this article:SHI Ruyi,LIU Xiangjiang,XIE Lijuan, et al. Raman Spectroscopy a Promising Technique for Quantification and Monitoring Heat-induced Formation of Trans Fatty Acids in Oil[OL].[18 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725585 |
6. Glutathione-Capped Gold Nanoparticles-Based Photoacoustic Sensor for Label-Free Detection of Lead Ions | |||
SHI Ruyi,LIU Xiangjiang | |||
Chemistry 18 April 2017 | |||
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Abstract:The photoacoustic signal generated by laser-induced nanobubbles (PA-LINB) proved to be a sensitive tool to monitor aggregation of gold nanoparticles. Here, a simple and label-free photoacoustic method for the rapid detection of Pb2+ in aqueous phase was developed. Due to the high affinity of Pb2+ ions to glutathione, the presence of Pb2+ led to the aggregation of glutathione conjugated gold nanoparticles (GSH-GNPs). Hence, by measuring the variation of the PA-LINB signal after the aggregation of GSH-GNPs, Pb2+ can be quantified. A low detection limit for Pb2+ (42 nM) and a wide linear working range (42 ~ 1000 nM) was achieved. Furthermore, the proposed method showed good selectivity against other metal ions. | |||
TO cite this article:SHI Ruyi,LIU Xiangjiang. Glutathione-Capped Gold Nanoparticles-Based Photoacoustic Sensor for Label-Free Detection of Lead Ions[OL].[18 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4725588 |
7. The development of the material for FA detection for Environmental and Health Monitoring | |||
Bi Anyao,Yang Shuqi,Liu Min,Wang Xiaobo,Zeng Wenbin | |||
Chemistry 18 April 2017 | |||
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Abstract:Formaldehyde (FA), as a vital industrial chemical, is widely used in building materials and numerous living products. It has become one of the most important air pollutants in residential and industrial occupational environments. Studies have shown FA is easy to react with nucleophilic material leading to the formation of DNA damage. Additionally, the Alzheimer's disease has also related to the intake of FA. The concentration of FA in our surroundings especially in urban environment has attracted increasingly attention. Thus, developing a rapid, sensitive and facile method to determine the concentration levels of FA becomes highly desirable. Up to now, many types of FA sensing methods have been applied to detect and quantify the FA concentration. Herein, we summarized the recent development of the material for FA detection and their application in environmental and health monitoring, with a focus on fluorescent probe, nanomaterials, and biomolecules. Nevertheless, the further trend of related development from lab to indoors was also proposed. | |||
TO cite this article:Bi Anyao,Yang Shuqi,Liu Min, et al. The development of the material for FA detection for Environmental and Health Monitoring[OL].[18 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4724917 |
8. The state of art of novel gene detection technique | |||
Zhang Hailiang,Liu Xiaohui,Liu Meihui,Gao Tang,Yuzhao Huang,Zeng Wenbin | |||
Chemistry 14 April 2017 | |||
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Abstract:Gene detection plays an important role in public health and consumer finances cause its prominent functions in precision medicine, pathogens detection and species identification. What's more,the announcement of Precision Medicine Initiative would strengthen its status further in many aspects. Therefore, rapid and simplified gene detection methods are in urgent demand to meet the practical use. During the last decades, gene detection techniques have advanced considerably by integrating various strategies such as microassay, nanotechnologies and electrochemical methods. Herein, we summarized the recent development of gene detection based on the gene detection methods (optical, electrochemical), and highlighted those techniques with the potentials to realize point-of-Care (POC) testing. Additionally, gene detection principle, amplification strategies and their applications are also discussed. | |||
TO cite this article:Zhang Hailiang,Liu Xiaohui,Liu Meihui, et al. The state of art of novel gene detection technique[OL].[14 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4724905 |
9. Effective Degradation of Nitrotoluenes in Wastewater by Heterogeneous Catalytic Ozonation in the presence of Calcium Oxide (CaO/O3) | |||
LIAO Minhui,CHEN Jida,LI Lingxing,HE Huirong,LU Lansi,FU Denglin | |||
Chemistry 12 April 2017 | |||
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Abstract:CaO was utilized as a heterogeneous catalyst for ozonation of nitrotoluenes wastewater. Results showed that CaO could promote ozone to generate more hydroxyl radicals (oOHs) that non-selectively degrade p-nitrotoluene (PNT) at an over double oxidation rate of alone ozone in simulated wastewater. A possible degradation pathway of PNT was proposed by gas chromatography/mass spectr ometry (GC/MS) analysis. CaO maintained a good pH and catalytic activity after several repeated use in CaO/O3. The removal efficiency of chemical oxygen demand (CODcr), content of nitrotoluenes, chromaticity and odour reached 97.97 %, 99.96%, 100% and 100% in wastewater at the same time, respectively. | |||
TO cite this article:LIAO Minhui,CHEN Jida,LI Lingxing, et al. Effective Degradation of Nitrotoluenes in Wastewater by Heterogeneous Catalytic Ozonation in the presence of Calcium Oxide (CaO/O3)[OL].[12 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4724431 |
10. Synthesis of 9-methyl-2,4-nitro- 5-chloro acridine: an key intermediate for Plakinidines | |||
Dong Lichun,Xing Lan,Chen Sihong | |||
Chemistry 30 March 2017 | |||
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Abstract:Plakinidines is a class of marine bioactive substances found in recent years, which have significant biological activity, such as inhibition of colon cancer cells, anti-leukemia and so on. It is of great significance to carry out its all synthetic work because of its potential application value. In this paper, a simple synthetic route was designed, and the intermediate intermediates of pramipride were successfully synthesized by using nitrobenzene, Ullmann coupling, Friedel-Crafts cyclization and rearrangement four-step reaction with m-dichlorobenzene as raw material 9-methyl-2,4-nitro-5-chloroacridine. The main influencing factors of each step reaction were discussed, and the product structure was confirmed by NMR, MS and other methods.. | |||
TO cite this article:Dong Lichun,Xing Lan,Chen Sihong. Synthesis of 9-methyl-2,4-nitro- 5-chloro acridine: an key intermediate for Plakinidines[OL].[30 March 2017] http://en.paper.edu.cn/en_releasepaper/content/4723015 |
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