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Pham, Ha Thanh Tung,Ha, Thi Kim Quy,Cho, Hyo Moon,Lee, Ba Wool,An, Jin Pyo,Tran, Van On,Oh, Won Keun American Chemical Society and American Society of 2018 Journal of natural products Vol.81 No.11
<P>As part of ongoing research to find new antidiabetic agents from medicinal plants, the chemical composition of <I>Gynostemma longipes</I>, an ethnomedicinal plant used to treat type 2 diabetes mellitus by local communities in Vietnam, was investigated. Ten new dammarane triterpenes, including two 3,4-<I>seco</I>-dammarane analogues, secolongipegenins S1 and S2 (<B>1</B> and <B>2</B>), a 3,4-<I>seco-</I>hexanordammarane, secolongipegenin S3 (<B>3</B>), two hexanordammarane glycosides, longipenosides ND1 and ND2 (<B>4</B> and <B>5</B>), and five other dammarane glycosides, longipenosides GL1-GL5 (<B>6</B>-<B>10</B>), were isolated from a 70% EtOH extract of the whole <I>G. longipes</I> plant. The structures of the new compounds were elucidated using diverse spectroscopic methods. All of the isolates were evaluated for their stimulatory activities on glucose uptake in differentiated 3T3-L1 adipocyte cells using 2-[<I>N</I>-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-<SMALL>D</SMALL>-glucose as a fluorescent-tagged glucose probe. The stimulant activities on glucose uptake by the test compounds were mediated via the activation of the AMPK pathway using differentiated mouse C2C12 skeletal myoblasts. Consequently, compounds <B>1</B>, <B>2</B>, and <B>4</B> enhanced glucose uptake and GLUT4 translocation significantly by regulating the AMPK signaling pathway.</P> [FIG OMISSION]</BR>
Pham, Tung Thanh,Nguyen, Tiep Tien,Pathak, Shiva,Regmi, Shobha,Nguyen, Hanh Thuy,Tran, Tuan Hiep,Yong, Chul Soon,Kim, Jong Oh,Park, Pil–,Hoon,Park, Min Hui,Bae, Young Kyung,Choi, Jeong Uk,Byun, IPC Science and Technology Press 2018 Biomaterials Vol.154 No.-
<P><B>Abstract</B></P> <P>This study aims to develop a novel surface modification technology to prolong the survival time of pancreatic islets in a xenogenic transplantation model, using 3,4–dihydroxyphenethylamine (DOPA) conjugated poly(lactide–co–glycolide)–poly(ethylene glycol) (PLGA–PEG) nanoparticles (DOPA–NPs) carrying immunosuppressant FK506 (FK506/DOPA–NPs). The functionalized DOPA–NPs formed a versatile coating layer for antigen camouflage without interfering the viability and functionality of islets. The coating layer effectively preserved the morphology and viability of islets in a co–culture condition with xenogenic lymphocytes for 7 days. Interestingly, the mean survival time of islets coated with FK506/DOPA–NPs was significantly higher as compared with that of islets coated with DOPA–NPs (without FK506) and control. This study demonstrated that the combination of surface camouflage and localized low dose of immunosuppressant could be an effective approach in prolonging the survival of transplanted islets. This newly developed platform might be useful for immobilizing various types of small molecules on therapeutic cells and biomaterial surface to improve the therapeutic efficacy in cell therapy and regenerative medicine.</P>
Tung Thanh Pham,Hanh Thuy Nguyen,Cao Dai Phung,Shiva Pathak,Shobha Regmi,하동호,김종오,용철순,김상균,최지은,육심명,박준범,정지헌 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.76 No.-
Selective delivery of anti-cancer drugs to bone tumors remains an on-going developmental issue due toproblems of drug availability and the physiological nature of bone. This study was undertaken to enhanceaccumulation of doxorubicin (DOX) in bone metastasis microenvironments using alendronate-functionalized graphene oxide nanosheets (NGO-ALs). In vivo biodistribution study showed NGO-ALswere retained for longer and at higher concentrations in bone tumor areas than non-functionalizedNGOs. Ourfindings suggest that NGO-ALs could be used as a promising carrier to enhance antitumoreffects and diminish the off-target effects of DOX for the treatment of bone metastasis.
Pham, Tung Thanh,Nguyen, Hanh Thuy,Phung, Cao Dai,Pathak, Shiva,Regmi, Shobha,Ha, Dong-Ho,Kim, Jong Oh,Yong, Chul Soon,Kim, Sang Kyoon,Choi, Ji-Eun,Yook, Simmyung,Park, Jun-Beom,Jeong, Jee-Heon Elsevier 2019 Journal of industrial and engineering chemistry Vol.76 No.-
<P><B>Abstract</B></P> <P>Selective delivery of anti-cancer drugs to bone tumors remains an on-going developmental issue due to problems of drug availability and the physiological nature of bone. This study was undertaken to enhance accumulation of doxorubicin (DOX) in bone metastasis microenvironments using alendronate-functionalized graphene oxide nanosheets (NGO-ALs). In vivo biodistribution study showed NGO-ALs were retained for longer and at higher concentrations in bone tumor areas than non-functionalized NGOs. Our findings suggest that NGO-ALs could be used as a promising carrier to enhance antitumor effects and diminish the off-target effects of DOX for the treatment of bone metastasis.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Cao Thanh Tung Pham,김현성 한국진공학회 2023 Applied Science and Convergence Technology Vol.32 No.4
Ruthenium tris(bipyridine) [Ru(bpy)3] acts as a photocatalyst under visible-light irradiation. However, it undergoes dimerization and degradation and has a short photocatalytic life. In this study, we encapsulated Ru(bpy)3 as a guest molecule in a suitable host material, which is a zeolitic imidazolate framework-71 (ZIF-71), using a simple in situ synthesis method. This stabilized its photocatalytic activity. A series of Ru(bpy)3@ZIF-71 composites ( = Zn2+: Ru ratio = 1, 3, 5, 7, and 10) with different amounts of loaded Ru(bpy)3 were synthesized and characterized by X-ray diffraction, ultraviolet-visible (UV-vis) spectroscopy, and fluorescence spectroscopy. The crystal structure of ZIF-71 was maintained in the Ru(bpy)3@ZIF-71 samples, and their UV-vis absorbance and fluorescence were almost identical to those of pure Ru(bpy)3. Moreover, Ru(bpy)3@ZIF-71 exhibited a high conversion yield (95 %) for the photocatalytic conversion of -bromoacetophenone to acetophenone and good recycling stability over three cycles. We believe this strategy can be applied to fabricate other similar host–guest photocatalytic systems.
Investigation of flexural behavior of a prestressed girder for bridges using nonproprietary UHPC
Pham, Hoa D.,Khuc, Tung,Nguyen, Tuan V.,Cu, Hung V.,Le, Danh B.,Trinh, Thanh P. Techno-Press 2020 Advances in concrete construction Vol.10 No.1
Ultra-high-performance concrete (UHPC) is recognized as a promising material in future civil engineering projects due to its outstanding mechanical and durability properties. However, the lack of local UHPC materials and official standards, especially for prestressed UHPC structures, has limited the application of UHPC. In this research, a large-scale prestressed bridge girder composed of nonproprietary UHPC is produced and investigated. This work has two objectives to develop the mixing procedure required to create UHPC in large batches and to study the flexural behavior of the prestressed girder. The results demonstrate that a sizeable batch of UHPC can be produced by using a conventional concrete mixing system at any precast factory. In addition, incorporating local aggregates and using conventional mixing systems enables regional widespread use. The flexural behavior of a girder made by this UHPC is investigated including flexural strength, cracking pattern and development, load-deflection curve, and strain and neutral axis behaviors through a comprehensive bending test. The experimental data is similar to the theoretical results from analytical methods based on several standards and recommendations of UHPC design.
TUNG, Le Thanh,THANG, Pham Nang Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.3
The paper aims to investigate the impact of foreign direct investment (FDI) on private investment with a sample having 49 developing countries in Asia (17 countries) and Africa (32 countries) during the period of 1990-2017. Unlike previous studies, we split the data into three groups for further analysis, including the Asian, African and the full-panel samples. The results confirm a crowding-in effect which shows that foreign direct investment promotes private investment on all three research samples. Besides, the lagged private investment has a positive and significant effect on itself in the next period which reflects the inertia in the trend of private investment in recipient countries. In the full-panel sample, there are some macro factors such as GDP per capita, trade openness, and electricity that also have a positive and statistically significant impact on private investment. Besides, when more deeply estimate with smaller samples, we find that trade openness and labour force have a positive and significant in Africa, on the other hand, not in Asia. However, the domestic credit variable has a negative and significant effect on private investment only in Asian developing countries. Furthermore, there is only a positive and significant impact of the electricity variable on private investment in Asia.
A dense, pinholes-free pure cubic phase CsPbBr3 nanocrystals film for high-performance photodetector
Thanh-Tung Duong,Phuong-Nam Tran,Tuan-Pham Van,Duy-Hung Nguyen,Van-Dang Tran 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.2
This study demonstrates a simple centrifugal coating method to prepare high-quality pure cubic phase CsPbBr 3 nanocrystalfi lm. The resultant perovskite layers possess a uniform and dense 500 nm-thick, with a bandgap of 2.38 eV, a low trap-statedensity of 6.9 × 10 − 15 cm − 3 , and carrier mobility of approximately 19.8 cm 2 V − 1 s − 1 . Furthermore, CsPbBr 3 NCs-basedself-powered photodetectors with high charge carriers’ charge transfer are fabricated. The device shows a low dark currentdensity of 1.93 × 10 − 7 A/cm 2 at room temperature. Such photodetectors show the highest responsivity of 3.0 AW − 1 ,specifi c detectivity of 1.2 × 10 13 Jones, and external quantum effi ciency (EQE) of 920% at zero bias voltage. The proposedmethod shows signifi cant promise for use in the lab fabrication of optoelectronic devices based on thin fi lms of nanocrystalperovskite materials.
Thanh Bui Trung,Van Pham Hung,Hai Tran Hoang,Le Minh Tung,이재령 한국자원공학회 2015 Geosystem engineering Vol.18 No.4
A method for detecting glypican 3 (GPC3) liver cancer cells by coupling of anti-glypican 3 antibody (anti-GPC3) and magnetite nanoparticles (NPs) was investigated to detect GPC3 by enzyme-linked immunosorbent assay (ELISA) in this study. Magnetite NPs with the average size of 11 nm were synthesized by using co-precipitation method of Fe2+ and Fe3+ in NH3·H2O solution. First, silica was coated on the magnetite NPs using Stöber method to obtain Fe3O4/SiO2 core-shell structures and then 3-aminopropyltriethoxysilane (APTES) was treated on the Fe3O4/SiO2 by silanization reaction to achieve Fe3O4/SiO2/APTES nanostructures. After modified by APTES, the nanostructures were activated by glutaraldehyde (GA) to obtain functional groups on the nanostructures surface to bind with anti-GPC3 by covalent immobilization. The UV–vis spectroscopy was carried out to investigate the binding of anti-GPC3 to the NPs and binding efficiency (88.35%) was estimated by the Bradford method. The NPs bound anti-GPC3 (NPs/anti-GPC3) can detect GPC3 by using ELISA at low concentration (0.16 ng/ml).
Nonlinear Optical Zeolite Films for Second and Third Harmonic Generation
김현성,Tung Thanh Pham,윤경병 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.5
Methods to prepare novel second-order nonlinear optical (2O-NLO) materials composed of all-silica zeolite (silicalite-1) and a series of 2O-NLO molecules having high second order hyperpolarizability constants (βvalues) are reviewed. These methods include the development of novel methods to incorporate a series of hemicyanine (HC) molecules into the channels of silicaite-1 films in uniform orientations. The first method is to incorporate HC molecules tethered with long alkyl chains (octadecyl or longer) into the silicalite-1 channels with the long alkyl chain side first through the hydrophobic-hydrophobic interaction between the long alky chains and the silicalite-1 channels. The second method is to incorporate the HC molecule tethered with a medium length alkyl chain (nonyl) into the silicalite-1 channels with the medium length alkyl chain side first through hydrophobic-hydrophobic interaction between the medium length alky chain in the photoexcited state and the silicalite-1 channels. The third method is to incorporate the HC molecule tethered with propionic acid into the silicalite-1 channels with the propionic acid side last mediated by a tetrabultylammonium cation ionpaired to the propionate unit. A method to prepare a novel third-order nonlinear optical (3O-NLO) material composed of zeolite-Y and PbS or PbSe quantum dots is also reviewed. This Account thus describes a promising new direction to which the search for highly sensitive 2O-NLO and 3O-NLO materials has to be conducted and a new direction to which zeolite research and applications have to be expanded.