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Corporate Capital Structure Adjustments: Evidence from Vietnam Stock Exchange Market
Cuong Thanh NGUYEN,Cuong Manh BUI,Tuan Dinh PHAM 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.3
Building a target capital structure is one of the most important decisions in corporate financial management. The purpose of this article is to identify the determinants of capital structure and adjustment mechanism toward the target leverage. The partial adjustment model was applied on a sample of 306 non-financial companies listed on Vietnam stock exchange market during the period of 2008-2017. By the fixed effect model estimation method, the research results have discovered the factors of growth opportunities, firm size, tangible fixed assets and firm’s unique characteristics have a positive effect on the target capital structure of enterprises. Besides, profitability and dividend payment have a negative effect on the target capital structure of enterprises. Accordingly, the research results show that the average adjustment speed toward target leverage of the firms is 90.03%. Research results also demonstrate firms have higher or lower debt ratio than the target debt ratio, capital surplus or capital deficit also have an impact on the adjustment rate toward the target capital structure. The research results are consistent with the Dynamic Trade-off Theory. From this result, this article has provided policy implications for non-financial companies listed on Vietnam’s stock market in building a reasonable target capital structure according to operating timeline to maximize enterprise value.
Synthesis and Anti-osteoporosis Potential of Two New Indirubin-3'-oxime Derivatives
Cuong, Nguyen Manh,Tai, Bui Huu,Hoan, Dang Hoang,Long, Pham Quoc,Choi, Eun-Mi,Kim, Young-Ho The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.1
Two new indirubin-3'-oxime derivatives, indirubin-3'-[O-(3-bromoprop-1-yl)-oxime] (2) and indirubin-3'-[O-(methoxycarbonylmethyl)-oxime] (3) were synthesized. Their structures were confirmed by ESI-MS and NMR spectroscopic method. Both of them (5 ${\mu}g/mL$) significantly caused a elevation of cell growth, alkaline phosphate activity, and mineralization in osteoblastic MC3T3-E1 cells(p<0.05).
Cuong Manh Vu,Quang-Vu Bach,Huong Thi Vu,Dinh Duc Nguyen,Bui Xuan Kien,장순웅 한국고분자학회 2020 Macromolecular Research Vol.28 No.1
This paper presents an effective method for enhancing both the mode I (GIC) and mode II (GIIC) interlaminar fracture toughness of carbon fiber reinforced epoxy resin (CFRE). For precursor materials, silk fibroin nanofibers (nSF) and rice husk silica were prepared from sustainable resources. Nanocomposite samples were prepared using various loading ratios of the silica and nSF in epoxy resin (EP). Mechanical stirring and sonication techniques were used to prepare homogenous mixtures of silica and nSF in epoxy resin. Non-isothermal differential scanning calorimetry and the Kissinger equation were used to examine and calculate the cure kinetics and activation energy (Ea) of EP and the composite samples. The CFRE sample with hybrid fillers of nSF and silica at the ratio 0.2/20 (wt%/wt%) exhibited the highest GIC, and improved upon the mode-I and mode-II toughness of the pure-resin sample by 36.08% and 30.06%, respectively. Study of the fracture surfaces indicated that adding nSF and silica as fillers increases the energy required to fracture the CFRE.
Inhibitory effects of indirubin derivatives on the growth of HL-60 leukemia cells.
Cuong, Nguyen Manh,Tai, Bui Huu,Hoan, Dang Hoang,Huong, Tran Thu,Kim, Young Ho,Hyun, Jae-Hee,Kang, Hee-Kyoung Natural Product Communications 2010 Natural product communications Vol.5 No.1
<P>Six indirubin derivatives have been synthesized and their inhibitory effects on the growth of HL-60 human promyelocytic leukemia cells investigated. Cell viability was determined using the trypan blue exclusion method. Indirubin-3'-oxime (I-1) inhibited the growth of HL-60 cells with a GI50 value of 36.6 microM, whereas I-0, I-2, I-3, I-4 and I-6 showed only weak cytotoxic activities against HL-60 cancer cells with GI50 values in the range of 97.3 to over 100 microM. These results indicate that indirubin derivatives might be useful candidate agents for exploring potential antileukemic drugs.</P>
Tai, Bui Huu,Jung, Bong Yong,Cuong, Nguyen Manh,Linh, Pham Thuy,Tung, Nguyen Huu,Nhiem, Nguyen Xuan,Huong, Tran Thu,Anh, Ngo Thi,Kim, Jeong Ah,Kim, Sang Kyum,Kim, Young Ho Pharmaceutical Society of Japan 2009 Biological & pharmaceutical bulletin Vol.32 No.12
<P>Nine compounds, including six phenylethanoid glycosides: acteoside (1); bioside (2); echinacoside (3); poliumoside (4); phenylethyl glycoside (5); salidroside (6) and three flavonoids; linarin (7); apigenin (8); isorhoifolin (9), were isolated from the flowers of <I>Buddleja officinalis</I> M<SMALL>AXIM</SMALL>. (Buddlejaceae). Chemical structures were confirmed by <SUP>1</SUP>H-, and <SUP>13</SUP>C-NMR, and MS spectral methods and compared with those reported in the literature. Antioxidant activities of the methanol and water extracts, and all isolated compounds were evaluated using the total oxidant scavenging capacity (TOSC) assay against peroxynitrite. Results of the assay showed that the phenylethanoid glycosides, a major class of compounds of the flowers of <I>B. officinalis</I>, possess strong antioxidant activity. Of these, acteoside, echinacoside and poliumoside have 9.9-, 9.8- and 9.5-fold TOSC value, respectively, compared with the positive control, Trolox.</P>
Tai, Bui Huu,Nhut, Nguyen Duy,Nhiem, Nguyen Xuan,Quang, Tran Hong,Thanh Ngan, Nguyen Thi,Thuy Luyen, Bui Thi,Huong, Tran Thu,Wilson, Jennifer,Beutler, John A.,Ban, Ninh Khac,Cuong, Nguyen Manh,Kim, Yo Informa Healthcare 2011 PHARMACEUTICAL BIOLOGY Vol.49 No.10
<P><I>Context</I>: Acquired immune deficiency syndrome (AIDS) is a severe pandemic disease especially prevalent in poor and developing countries. Thus, developing specific, potent antiviral drugs that restrain infection by human immunodeficiency virus type 1 (HIV-1), a major cause of AIDS, remains an urgent priority.</P><P><I>Objective</I>: This study evaluated 32 extracts and 23 compounds from Vietnamese medicinal plants for their inhibitory effects against HIV-1 ribonuclease H (RNase H) and their role in reversing the cytopathic effects of HIV.</P><P><I>Materials and methods</I>: The plants were air-dried and extracted in different solvent systems to produce plant extracts. Natural compounds were obtained as previously published. Samples were screened for RNase H inhibition followed by a cytopathic assay. Data were analyzed using the Microsoft Excel.</P><P><I>Results and discussion</I>: At 50 μg/mL, 11 plant extracts and five compounds inhibited over 90% of RNase H enzymatic activity. Methanol extracts from <I>Phyllanthus reticulatus</I> and <I>Aglaia aphanamixis</I> leaves inhibited RNase H activity by 99 and 98%, respectively, whereas four extracts showed modest protection against the cytopathic effects of HIV.</P><P><I>Conclusion</I>: The screening results demonstrated that the butanol (BuOH) extract of <I>Celastrus orbiculata</I> leaves, methanol (MeOH) extracts of <I>Glycosmis stenocarpa</I> stems, <I>Eurya ciliata</I> leaves, and especially <I>P. reticulatus</I> leaves showed potential RNase H inhibition and protection against the viral cytopathic effects of HIV-1. Further chemical investigations should be carried out to find the active components of these extracts and compounds as potential anti-HIV drug candidates.</P>
Synthesis and Anti-osteoporosis Potential of Two New Indirubin-3`-oxime Derivatives
( Nguyen Manh Cuong ),( Bui Huu Tai ),( Dang Hoang Hoan ),( Pham Quoc Long ),( Eun Mi Choi ),( Young Ho Kim ) 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.1
Two new indirubin-3`-oxime derivatives, indirubin-3`-[O-(3-bromoprop-1-yl)-oxime] (2) and indirubin-3`-[O-(methoxycarbonylmethyl)-oxime] (3) were synthesized. Their structures were confirmed by ESI-MS and NMR spectroscopic method. Both of them (5 μg/mL) significantly caused a elevation of cell growth, alkaline phosphate activity, and mineralization in osteoblastic MC3T3-E1 cells (p<0.05).
Tai, Bui Huu,Cuong, Nguyen Manh,Huong, Tran Thu,Choi, Eun-Mi,Kim, Jeong-Ah,Kim, Young Ho Gordon and Breach ; Taylor Francis Health Sciences 2009 Journal of Asian natural products research Vol.11 No.9
<P>Chrysoeriol (1) was isolated as the main constituent from the methanol extract of the dried leaves of Eurya ciliata Merr. To investigate the bioactivities of 1 on bone metabolism, its effects on the function of osteoblastic MC3T3-E1 cells were studied. Compound 1 significantly increased the growth of MC3T3-E1 cells and caused a significant elevation of alkaline phosphatase activity, collagen content, and nodule mineralization in the cells (P < 0.05). Our data indicate that the enhancement of osteoblast function by 1 may be useful in the prevention of osteoporosis.</P>
Tai, Bui Huu,Huyen, Vu Thi,Huong, Tran Thu,Nhiem, Nguyen Xuan,Choi, Eun-Mi,Kim, Jeong Ah,Long, Pham Quoc,Cuong, Nguyen Manh,Kim, Young Ho The Pharmaceutical Society of Japan 2010 Chemical & pharmaceutical bulletin Vol.58 No.4
<P>The new pyrano-pyrone, (+)-8-epi-9-deoxygoniopypyrone (1) and (+)-9-deoxygoniopypyrone (2) were isolated from a chloroform extract of <I>Goniothalamus tamirensis</I> leaves. Their absolute stereostructures were discussed and confirmed by using infrared (IR), Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS), one (1D) and two-dimensional (2D) nuclear magnetic resonance (NMR) spectra, Mosher's method, and comparison with the known compounds leiocapin A (3), deoxygoniopypyrone A (4), and (−)-8-epi-9-deoxygoniopypyrone (5). At concentrations of 2.67 μ<SMALL>M</SMALL>, compounds 1 and 2 significantly increased the growth of osteoblastic MC3T3-E1 cells and caused a significant elevation of collagen content, alkaline phosphatase activity, and nodule mineralization in the cells (<I>p</I><0.05). Our data suggest that the enhancement of osteoblast function by 1 and 2 may result in the prevention of osteoporosis.</P>