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Ta, Van-Thao,Park, Juhun,Park, Eun Jin,Hong, Seunghun American Chemical Society 2014 ACS NANO Vol.8 No.3
<P>We report a <I>reusable</I> floating-electrode sensor based on aligned semiconducting single-walled carbon nanotubes for the <I>quantitative</I> monitoring of the electrophysiological responses from a <I>nonadherent</I> cell. This method allowed us to monitor and distinguish the real-time responses from <I>normal</I> and <I>small-cell lung cancer</I> (SCLC) cells to the addition of nicotine. The difference was attributed to the overexpressed nicotinic acetylcholine receptors (nAChRs) in the SCLC cells. The sensor was also utilized to monitor the effect of various drugs on the cells. The treatment with inhibitors such as genistin or daidzein was found to reduce Ca<SUP>2+</SUP> influx in SCLC cells. Moreover, tamoxifen, though known as the antiestrogen compound, was found to only partly block the binding of daidzein to nAChRs. Significantly, the activities of <I>multiple</I> individual cells could be measured repeatedly using a <I>single</I> sensor device, enabling statistically meaningful measurements without errors from the device-to-device variations of the sensor characteristics. This capability of the <I>quantitative</I> monitoring of <I>nonadherent</I> cells should be a major breakthrough for electrophysiology research and various biomedical applications such as drug screening and therapeutic monitoring.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-3/nn4053155/production/images/medium/nn-2013-053155_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4053155'>ACS Electronic Supporting Info</A></P>
Investigating Foreign Direct Investment Attractive Factors of Korean Direct Investment into Vietnam
TA, Van Loi,LE, Quoc Hoi,NGUYEN, Thi Lien Huong,PHAN, Thuy Thao,DO, Anh Duc Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6
This paper aims to investigate FDI attractive factors, which are important to formulate policies to attract Korean direct investment into Vietnam. Based on the literature review and the results of interview with 27 Korean investors in Vietnam, we determined the model of variables attracting Korea's FDI into Vietnam. It is used to assess the impact of attractive factors belonging to three groups of variables to support investment decision; they are macroeconomics variables (including market size factor, labor cost factor, and market openness factor), policies variables (including monetary policy factor and tax rate gap factor), and microeconomics variables (geographic advantage factor representative by location). This research also utilized a relatively new quantitative research method based on the Autoregressive Distributed Lag model (ARDL) with the time data chain from 1995 to 2017 of Korean FDI into Vietnam. It analyzes long-term relationships between dependent variables and independent variables. The result of this study indicates that there are three positive factors (low wages, trade openness and government policy) explaining the FDI flows in the long term. The result also shows that incentive tax policy has had a positive impact on Korean FDI, which has satisfied the aim of seeking efficiency of Korean investors.
Pham Ba, Viet Anh,Cho, Dong-guk,Kim, Daesan,Yoo, Haneul,Ta, Van-Thao,Hong, Seunghun Elsevier 2017 Biosensors & bioelectronics Vol.94 No.-
<P><B>Abstract</B></P> <P>We demonstrated the quantitative electrophysiological monitoring of histamine and anti–histamine drug effects on live cells <I>via</I> reusable sensor platforms based on carbon nanotube transistors. This method enabled us to monitor the real–time electrophysiological responses of a single HeLa cell to histamine with different concentrations. The measured electrophysiological responses were attributed to the activity of histamine type 1 receptors on a HeLa cell membrane by histamine. Furthermore, the effects of anti–histamine drugs such as cetirizine or chlorphenamine on the electrophysiological activities of HeLa cells were also evaluated quantitatively. Significantly, we utilized only a single device to monitor the responses of multiple HeLa cells to each drug, which allowed us to quantitatively analyze the antihistamine drug effects on live cells without errors from the device-to-device variation in device characteristics. Such quantitative evaluation capability of our method would promise versatile applications such as drug screening and nanoscale bio sensor researches.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed a reusable sensor platform to monitor the activities of multiple adherent cells with a single-cell-level. </LI> <LI> The reusable sensor platform was used to monitor the electrophysiological responses of individual adherent cells to drugs. </LI> <LI> Using the method, we quantitatively evaluated the effect of histamine and anti–histamine drugs to HeLa cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Synthesis and Modification of Novel Iminecalix[4]arene Derivatives
Satish Balasaheb Nimse,Junbae Kim,Keum-Soo Song,Junghoon Kim,이정태,Van-Thao Ta,Van-Thuan Nguyen,김태선 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
The synthesis of novel iminecalix[4]arenes and further modification thereafter is described using a synthetic strategy. The reaction of the benzaldehyde derivatives with tetraamine functions on the calix[4]arene easily afforded the pure compounds in 92.4-95.7% yields, regardless of the effect of the substituents on the benzaldehyde derivatives. These compounds were stable under the conditions to obtain their analogue dialkylated in the narrow rim, with 83.2-89.9% yields. Characterization of the newly synthesized iminecalix[4]arene derivatives by spectroscopic methods revealed that all compounds are in the cone conformations.
Synthesis and Modification of Novel Iminecalix[4]arene Derivatives
Nimse, Satish Balasaheb,Kim, Jun-Bae,Lee, Jeong-Tae,Song, Keum-Soo,Kim, Jung-Hoon,Ta, Van-Thao,Nguyen, Van-Thuan,Kim, Tai-Sun Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
The synthesis of novel iminecalix[4]arenes and further modification thereafter is described using a synthetic strategy. The reaction of the benzaldehyde derivatives with tetraamine functions on the calix[4]arene easily afforded the pure compounds in 92.4-95.7% yields, regardless of the effect of the substituents on the benzaldehyde derivatives. These compounds were stable under the conditions to obtain their analogue dialkylated in the narrow rim, with 83.2-89.9% yields. Characterization of the newly synthesized iminecalix[4]arene derivatives by spectroscopic methods revealed that all compounds are in the cone conformations.