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( Tran Dieu Linh ),( Thai Thanh Hoang Thi ),( Phuong Le Thi ),류승배,박기동 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Nowadays, to overcome the implant-related infection issue, many researches have been done to develop the antimicrobial surfaces, including the immobilization of antibacterial agents. Herein, graphene oxide (GO), a popular antibacterial agent with long-term and excellent activity, was immobilized on titanium dioxide (TiO<sub>2</sub>) substrates via tyrosinase-catalyzed reaction. GO was oxidized from graphene, following by the conjugation of the phenol groups using EDC/NHS chemistry, making GO capable to be oxidized by tyrosinase. These phenol moieties were oxidized into o-quinones by tyrosinase, can easily attach to TiO<sub>2</sub>. The GO immobilized surface show the antibacterial effect against both E.coli and S.aureus. Besides, they also show the biocompatibility with human dermal fibroblasts (hDFBs). This study presents a facile and rapid approach for enhancing antibacterial activity of TiO<sub>2</sub>.
Tran Dang Thanh,Dinh Chi Linh,Le Viet Bau,Thi Anh Ho,Tien Van Manh,The-Long Phan,Seong-Cho Yu IEEE 2015 IEEE transactions on magnetics Vol.51 No.1
<P>Four samples of La<SUB>0.7</SUB>Sr<SUB>0.3</SUB>Mn<SUB>0.92</SUB>Co<SUB>0.08</SUB>O<SUB>3</SUB> (LSMCO) with different crystallite sizes were prepared by the combination of solid-state reaction and mechanical milling methods. Based on isothermal magnetization data, M(H), temperature dependences of magnetic entropy change, ΔS<SUB>m</SUB>T, of the samples under a magnetic field change of 10 kOe were calculated. The maximum values of magnetic entropy change (|ΔS<SUB>max</SUB>|) at room temperature are in the range of 0.9-1.4 J · kg<SUP>-1</SUP> · K<SUP>-1</SUP>, corresponding to ferromagnetic (FM)-paramagnetic phase transition. In addition, M<SUP>2</SUP> versus H/M curves at temperatures around TC prove the samples exhibiting a second-order magnetic phase transition. The critical exponents β, γ, and δ were determined using the modified Arrott plot method and critical isotherm analysis. Here, these exponent values are located in between those expected for the mean-field theory and 3-D Heisenberg model. It means the coexistence of short-range and long-range FM interactions in LSMCO nanoparticles.</P>
Artocarpus nigrifolius: Cytotoxic and Antibacterial Constituents
Tran Minh Hoi,김영호,Ha Van Anh,Nguyen Thi Thanh Huong,Nguyen Van Tuyen,Le Thi Tu Anh,Nguyen Thanh Tra,Ba Thi Cham,Nguyen Thi Thu Ha,Pham Thuy Linh,Doan Duy Tien,Phan Van Kiem,Ninh Khac Ban,Lidziya Kukha 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Six known compounds including α-amyrin 3-acetate (1), β-sitosterol (2), betulinic acid (3), friedelan-3-one (4),artochamin B (5), and 2-C-methyl-D-erythritol 4-O-α-D-glucopyranoside (6) were isolated from the stem barks and leaves of Artocarpus nigrifolius (Moraceae) for the first time. Their structures were identified by spectroscopic methods as well as comparison with literatures. Cytotoxicity and antibacterial activity of 1-6 were evaluated. Results showed that artochamin B (5)possessed the highest cytotoxicity towards MCF7, Lu, HepG2,and KB cell lines with IC50 values of 4.59, 20.00, 3.60, and 1.18μg/mL, respectively. It also inhibited the growth of Gram-positive bacteria (Bacillus subtilis, Staphylococcus aureus), whereas inactive on the growth of both Gram-negative bacteria and yeast.
Linh, Dinh Chi,Thanh, Tran Dang,Anh, Le Hai,Dao, Van Duong,Piao, Hong-Guang,Yu, Seong-Cho Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.725 No.-
<P><B>Abstract</B></P> <P>Influence of alkaline earth element doping in the A-site on the structure, magnetic and magnetocaloric properties of La<SUB>0.7</SUB>Ca<SUB>0.3-x</SUB>A<SUB>x</SUB>MnO<SUB>3</SUB> (A = Sr and Ba; <I>x</I> = 0, 0.15 and 0.3) perovskite manganites have been investigated. X-ray diffraction data indicates that samples <I>x</I> = 0 and 0.15 crystallize in the orthorhombic structure (space group <I>Pnma</I>), whereas samples <I>x</I> = 0.3 belong to the rhombohedral structure (space group <I>R</I>-3<I>c</I>). Substitution of Sr or Ba for Ca plays an important role in the increase of Curie temperature (<I>T</I> <SUB>C</SUB>) and modification the nature of the magnetic phase transition in materials. Sample <I>x</I> = 0 exhibits the first-order phase transition (FOPT) with a large magnetic entropy change (Δ<I>S</I> <SUB>m</SUB>), whereas samples <I>x</I> = 0.15 and 0.3 exhibit the second-order phase transition (SOPT) characterizations and the moderate values of Δ<I>S</I> <SUB>m</SUB>. Using the modified Arrott plots method, the critical behaviors around <I>T</I> <SUB>C</SUB> for SOPT samples have been investigated through the values of critical parameters (<I>T</I> <SUB>C</SUB>, <I>β</I>, <I>γ</I>, and <I>δ</I>). We pointed out that Ba-doping favors establishing long-range ferromagnetic order, contrary to the case of Sr-doping.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Sr or Ba-doped La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>MnO<SUB>3</SUB> leads to modify the nature of the phase transition. </LI> <LI> Ba-doping favors establishing long-range FM order, contrast with Sr-doping. </LI> <LI> The effective exponents vary non-monotonically in the asymptotic region. </LI> </UL> </P>
Tran Dang Thanh,Dinh Chi Linh,Tien Van Manh,Wen-Zhe Nan,Seong-Cho Yu,Hong-Guang Piao,Liqing Pan 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
In this work, we present a detailed study on the magnetic and the magnetocaloric properties of Sm0.5+xSr0.5−xMnO3 compounds with x = 0 − 0.1, which were prepared by using a solid-state reaction method. The x-dependent magnetic, as well as magnetocaloric, properties, including the magnetic phase transition, have been studied. The increase in Sm/Sr ratio plays an important role in controlling the Curie temperature (TC). We point out that all the samples undergo a first-order phase transition and exhibit a giant magnetocaloric effect. The magnetic entropy change (Sm) of samples was calculated based on isothermal M(H, T) data. The maximum value of Sm (denoted as |Smax|) at around TC is found to be 2.6 − 8.9 J·kg−1·K−1 for H = 30 kOe and depends on the value of x. We have also used the universal master curve method for the temperature dependences of Sm curves measured at different H values, Sm(T,H), to distinguish the magnetic order in the samples. Interestingly, none of the Sm(T,H) curves for the samples follow the universal master curve, Sm(T,H)/Smax versus = (T −TC)/(Tr−TC). As a consequence, a breakdown in the universal behavior of Sm(T,H)/Smax versus curve is another feature confirming a first-order phase-transition nature.
Thanh, Tran Dang,Linh, Dinh Chi,Yen, Pham Duc Huyen,Bau, Le Viet,Ky, Vu Hong,Wang, Zhihao,Piao, Hong-Guang,An, Nguyen Manh,Yu, Seong-Cho Elsevier 2018 PHYSICA B-CONDENSED MATTER - Vol.532 No.-
<P><B>Abstract</B></P> <P>In this work, we present a detailed study on the magnetic properties and the magnetocaloric effect (MCE) of La<SUB>1−x</SUB>K<SUB>x</SUB>MnO<SUB>3</SUB> compounds with <I>x</I>=0.05–0.2. Our results pointed out that the Curie temperature (<I>T</I> <SUB>C</SUB>) could be controlled easily from 213 to 306K by increasing K-doping concentration (<I>x</I>) from 0.05 to 0.2. In the paramagnetic region, the inverse of the susceptibility can be analyzed by using the Curie-Weiss law, <I>χ</I>(<I>T</I>)=<I>C</I>/(<I>T</I>−<I>θ</I>). The results have proved an existence of ferromagnetic clusters at temperatures above <I>T</I> <SUB>C</SUB>. Based on Banerjee's criteria, we also pointed out that the samples are the second-order phase transition materials. Their magnetic entropy change was calculated by using the Maxwell relation and a phenomenological model. Interestingly, the samples with <I>x</I>=0.1–0.2 exhibit a large MCE in a range of 282–306K, which are suitable for room-temperature magnetic refrigeration applications. The composites obtained from single phase samples (<I>x</I>=0.1–0.2) exhibit the high relative cooling power values in a wide temperature range. From the viewpoint of the refrigerant capacity, the composites formed out of La<SUB>1−x</SUB>K<SUB>x</SUB>MnO<SUB>3</SUB> will become more useful for magnetic refrigeration applications around room-temperature.</P>
Novel antibiotic delivery using graphene oxide immobilized surfaces
( Tran Dieu Linh ),( Thai Thanh Hoang Thi ),( Phuong Le Thi ),박기동 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Implant-related infection is a noteworthy issue because of their negative effect to the success of implantation, and the cost of treatment. To solve this problem, the development of antimicrobial surface has been considered as an urgent mission. Herein, we demonstrated that graphene oxide (GO)-immobilized TiO<sub>2</sub> surface is an efficient carrier for the local delivery of antibiotic. The phenol-functionalized GO deriva-tive was synthesized and immobilized on TiO<sub>2</sub> under the catalysis of tyrosinase, following by the loading of doxycycline hyclate (Dox). The modified surface was able to carry 36 μg of Dox and ensured the release for a month. These surfaces also showed good antibacterial activity against both E. coli and S. aureus, without the cytotoxic effect on hDFBs. It is expected that the release of Dox from GO-immobilized surfaces can solve the pressing need for enhanced infection control
Factors Influencing Technology Adoption in Vietnam's Educational System
TRAN, Nga,LE, Thanh,NGUYEN, Lan,HOANG, Linh,NGUYEN, Thuy Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10
This research aims to shed light on the technology adoption process and its drivers in the Vietnamese educational system. Research data was collected with an online questionnaire from more than 600 teachers in primary schools, secondary schools, high schools, colleges, and universities in Vietnam in 2020. Based on a holistic literature review, we develop a model of two extrinsic factors (global needs and school-infrastructure), and two intrinsic factors (teachers' technological literacy and their beliefs), which are correlated with the teachers' technological adoption. We measure the dependent variable by asking the teachers' ability and their efficacy to implement technology in teaching according to a Likert scale. With the support of SPSS_22 and STATA_2015, we find that over 70% of changes in technology adoption are explained by the changes in four independent variables and three control variables related to age, gender, and teaching-level of the teachers. Furthermore, these independent variables are significantly and positively associated with two dependent variables. However, a significant difference in technology integration ability can be seen among teachers' gender, age, and school-level. Specifically, male teachers seem to adopt technology at schools than female teachers better, and university teachers have the lowest level of technology adoption compared to other school-level teachers.