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Nhung, Tran Thi,Kang, Ik-Joong,Lee, Sang-Wha American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>Flowerlike gold nanostructure was facilely prepared by the seed-mediated growth of gold nanoparticles in chitosan-TPP template films. Firstly, chitosan nanoparticles, spontaneously formed by inter and/or intra cross-linking with TPP, were transformed into gel-type of chitosan-TPP films under strong sonication process. After then, gold seeds (1-3 nm) were entrapped in chitosan-TPP films via electrostatic interactions, and the resulting films were subsequently used as a template for growing gold nanoparticles and subsequent formation of anisotropic gold nanoflowers. The size and optical properties of gold nanoflowers were controlled simply by changing the ratio of gold salts to chitosan-TPP template films. Gold nanoflowers consisted of many aggregated nanodots exhibited broad Plasmon-derived absorption bands with strong red-shift into NIR wavelength, which might be a good prospect for SERS and biomedical applications.</P>
Tran, Thi Nhung,Kim, Do-Gun,Ko, Seok-Oh Elsevier 2018 Journal of hazardous materials Vol.344 No.-
<P><B>Abstract</B></P> <P>While biogenic manganese oxide (BMO) generated via the oxidation of Mn(II) by the Mn-oxidizing bacteria (MOB) have received attention, the relative roles of biological activity by MOB themselves were not clearly investigated. In this study, the synergistic effects of BMO and MOB <I>Pseudomonas putida</I> strain MnB1 on the degradation of 17α-ethinylestradiol (EE2) was investigated. Experiments with BMO in the presence of <I>P. putida</I> MnB1 showed 15-fold higher removal than that with BMO alone, suggesting that EE2 degradation was mediated by the biological activity of MOB as well as abiotic reaction by BMO. Trapping experiments with pyrophosphate (PP) proved that Mn(III) intermediate formed during the biological process from Mn (II) to Mn (IV) contribute much to the EE2 removal. Also, sharp decreases in EE2 removal were observed when microbial activity was inactivated by heat treatment or sodium azide. From this study, the EE2 removal mechanisms by BMO in the presence <I>P. putida</I> MnB1 are described as follows: (1) abiotic oxidation of EE2 by BMO occurs. (2) <I>P. putida</I> MnB1 indirectly oxidizes EE2 by transferring electrons from the Mn (III) intermediate. (3) <I>P. putida</I> MnB1 continuously re-oxidizes the Mn(II) released from the oxidative degradation of EE2 by BMO, generating new Mn(III)-intermediates or BMO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The presence of <I>P. putida</I> MnB1 significantly enhanced the removal of EE2 by BMO. </LI> <LI> EE2 degradation was mediated by the biological activity of MOB as well as abiotic reaction by BMO. </LI> <LI> A linear correlation was established between biological Mn(III)-intermediates and EE2 removal rate. </LI> <LI> EE2 oxidation by BMO and <I>P. putida</I> MnB1 involves the reduction of Mn(III)-enzyme complexes and BMO to Mn(II). </LI> <LI> The Mn(II) from Mn(III)-enzyme complexes and BMO is re-oxidized by <I>P. putida</I> MnB1, providing additional EE2 oxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Nhung, Tran Thi,Lee, Sang-Wha American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.23
<P>Highly asymmetrical “flower-like” micron silver particles, so-called hierarchical silver meso-flowers (AgMFs), were facilely synthesized using ascorbic acid at room temperature in the presence of chitosan biopolymer. The time–evolution of TEM images and XRD analysis confirmed the anisotropic growth of AgMFs with single crystalline phase of which the formation mechanism was described in detail. The morphology and size of as-prepared AgMFs were tunable simply by changing the concentration of chitosan biopolymer and/or AgNO<SUB>3</SUB> precursor under otherwise identical conditions. The asymmetrically textured AgMFs dramatically enhanced Raman signals of probe molecules (2-chlorothiophenol, 4-aminothiophenol) even at a single particle level because of their surface morphologies consisting of numerous nanoedges and crevices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-23/am506297n/production/images/medium/am-2014-06297n_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am506297n'>ACS Electronic Supporting Info</A></P>
Tran Thi Tuyet Nhung 한국마케팅학회 2023 ASIA MARKETING JOURNAL Vol.24 No.4
In emerging countries, traditional retail, such as wet markets, still accounts for a large proportion of retail sales. Traditional retail has poor infrastructure compared to modern retail, and is often associated with problems of waste, water, and environmental pollution. Therefore, traditional retail faces extreme difficulties in achieving sustainability. This study aimed to determine what value traditional retail contributes to sustainability. We generated and applied a conceptual framework of sustainability to explore this question. We used a single case study of a small-scale wet market in Vietnam. The results showed that wet markets have significant value for the development of sustainable retail, including economic, environmental, social, and community value. This study extends the literature by providing a comprehensive and accurate view about the value of traditional retail in contributing to sustainability. It suggests strategies for traditional retail in emerging countries to survive sustainably
Tran Thi Phuong Nhung,Le Pham Tan Quoc (사)한국식물생명공학회 2024 JOURNAL OF PLANT BIOTECHNOLOGY Vol.51 No.2
This study explores the insecticidal efficacy of ethanol extracts - obtained from the fruits and seeds of Melia azedarach (MAFS) - against Bactrocera cucurbitae. We assessed the effectiveness of the MAFS extracts at concentrations ranging from 1 to 625 ppm using both laboratory and greenhouse models. Sofri protein 10 DD (1.2 liters/ha) served as the standard insecticide, while water functioned as the negative control. Key parameters evaluated include pupation period, germination time, quantities of pupae and adult individuals, and the severity of damage to bitter melon fruits. In the laboratory model, MAFS significantly prolonged the pupation period (p < 0.05), reduced pupal numbers (p < 0.05), and affected the pupation percentage of B. cucurbitae (p < 0.05). In addition, the germination time (p < 0.05) and proportion of adult B. cucurbitae emergence (p < 0.05) were also significantly impacted. In the greenhouse experiment, MAFS significantly reduced the quantity of B. cucurbitae eggs on bitter melon plants (p < 0.05), resulting in a notable decrease in both larval (p < 0.05) and pupal quantities (p < 0.05). The inhibitory effects of MAFS on larval (p < 0.05) and pupal quantities (p < 0.05), as well as survival from the larval to adult stage, were equivalent to the sofri protein (p < 0.05). MAFS effectively mitigated the severity of damage to bitter melon fruits caused by B. cucurbitae (p < 0.05). Moreover, MAFS exhibits significant effects throughout the various developmental stages of B. cucurbitae. These findings support the potential of MAFS ethanol extracts as an efficient and eco-friendly solution for pest infestation management.
Nhung Thanh Thi Truong,Tam Huu Nguyen,Bao Kim Doan,Le-Thu T. Nguyen,Tam Hoang Luu,Chau Duc Tran,Thiet Quoc Nguyen,Ha Tran Nguyen 한국고분자학회 2021 Macromolecular Research Vol.29 No.11
In this research, three organic photocatalysts, 4-(4H-dithieno[3,2-b:2',3'- d]pyrrol-4-yl)-N,N-diphenylaniline, 4-(pyren-1-yl)-4H-dithieno[3,2-b:2',3'-d]pyrrole and 4-(6b,10-dihydroperylen-3-yl)-4H-dithieno[3,2-b:2',3'-d]pyrrole have been successfully synthesized through C-N coupling reactions. The chemical structures and the optical properties of the obtained organic photocatalysts have been characterized via 1H NMR,13C NMR, elemental analysis, and UV-Vis spectroscopy. Next, these dithieno[3,2-b:2′,3′-d]pyrrole-based photocatalysts have been used for the polymerization of methyl methacrylate, 2-(dimethylamino)ethyl methacrylate and tert-butyl methacrylate monomers under 365 nm UV irradiation, resulting in (meth)acrylate polymers with controlled molecular weights and low polydispersity indexes.