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CTE Method and Interaction Solutions for the Kadomtsev-Petviashvili Equation
Bo Ren 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.4
The consistent tanh expansion method is applied to the Kadomtsev-Petviashvili equation. The interaction solutions among one soliton and other types of solitary waves, such as multiple resonant soliton solutions and cnoidal waves, are explicitly given. Some special concrete interaction solutions are discussed both in analytical and graphical ways.
Anti-Inflammatory Activity of Compounds from the Whole Plant of Patrinia saniculaefolia
Ren Bo An,나민균,민병선,장현욱,배기환 한국생약학회 2011 Natural Product Sciences Vol.17 No.2
An in vitro bioassay-guide revealed that the methanol (MeOH) extract of the whole plant of Patrinia saniculaefolia (Valerianaceae) showed cyclooxygenase-2 (COX-2) and 5-lipoxygenase (5-LOX) dual inhibitory activity by assessing their effects on the production of prostaglandin D2 (PGD2) and leukotriene C4 (LTC4) in mouse bone marrow-derived mast cells (BMMCs). Phytochemical study of the MeOH extract of this plant led to the isolation of twelve compounds; b-farnesene (1), squalene (2), nardostachin (3), patridoid I (4), patridoid II (5), patridoid II-A (6), oleanolic acid (7), oleanonic acid (8), 23-hydroxyursolic acid (9), oleanolic acid 3-O-a-L-arabinopyranoside (10), oleanolic acid 3-O-b-D-glucopyranoside (11), oleanolic acid 3-O-[b-D-xylopyranosyl-(1 → 3)-b-D-(6-O-butyl)glucuronopyranoside] (12). Among the compounds, 4 and 5 strongly inhibited both the COX-2-dependent PGD2 generation with IC50 values of 8.7 and 13.6 mM, respectively, and the generation of LTC4 in the 5-LOX dependent phase with IC50 values of 41.7 and 46.9 mM, respectively, which suggest that the anti-inflammatory activity of P. saniculaefolia might occur in part via the inhibition of both PGD2 and LTC4 generation by 4 and 5.
Bo Ren,Zhi-Wei He,Yong-li Sun,Fu-Dong Wang 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.8
Based on the generalized bilinear operators in a prime number $p=3$, we introduce a (2+1)-dimensional coupled nonlinear partial differential like equation. By combining an exponential function with a quadratic function, an interaction between a lump wave and a one-kink soliton is generated. In addition, an interaction between a lump wave and a two-kink soliton, which is called a special rogue wave, can be obtained by adding two additional exponential functions. The dynamic properties of these interactions are depicted by selecting appropriate parameters.
Bo Ren,Ji Lin 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.5
The nonlocal symmetry for the Whitham-Broer-Kaup (WBK) equation is obtained by the Painleve analysis. With the introduction of two auxiliary dependent variables, the nonlocal sym- metry is localized to the Lie point symmetry. The reciprocal transformation is established by the localization nonlocal symmetry procedure and can be used to construct a link between the WBK equation and the usual Burgers equation. By using the similarity reductions related with the non- local symmetry of the Burgers equation, we derive the symmetry invariant solutions for the WBK equation. Furthermore, the power-series solutions are computed by using the power-series theory.
Chromone Glycosides and Hepatoprotective Constituents of Hypericum erectum
Ren Bo An,Jin-Seon Beom,손동환,Youn Chul Kim,Gil Saeng Jeong 대한약학회 2009 Archives of Pharmacal Research Vol.32 No.10
Two chromone glycosides, hyperimone A [7-(β-D-glucopyranosyloxy)-5-hydroxy-2-(1-methylethyl)-4H-1-benzopyran-4-one (1)] and hyperimone B [7-(β-D-glucopyranosyloxy)-5-hydroxy-3-methyl-4H-1-benzopyran-4-one (2)], together with six known compounds were isolated from the methanolic extract of the whole plant of Hypericum erectum. 1,3,5,6-Tetrahydroxyxanthone (5) and I3, II8-biapigenin (6) showed moderate hepatoprotective activity with EC50 values of 160.2 ± 0.6 μM and 217.7 ± 1.3 μM, respectively, against tacrine-induced cytotoxicity in HepG2 cells.
A New Monoterpene Glycoside and Antibacterial Monoterpene Glycosides from Paeonia suffruticosa
Ren-Bo An,Hyun-Chul Kim,이성희,정길생,Dong-Hwan Sohn,Hyun Park,권동렬,John Hwa Lee,김윤철 대한약학회 2006 Archives of Pharmacal Research Vol.29 No.10
Antibacterial activity-guided fractionation of the CHCl3-MeOH (1:1) extract of Paeonia suffruticosa root bark furnished three monoterpene glycosides, 6-O-vanillyoxypaeoniflorin (1), mudanpioside-H (2), and galloyl-oxypaeoniflorin (3). Of the isolated compounds, compound 1 is a new compound. All isolated compounds showed broad, but moderate, antibacterial activity with minimum inhibitory concentration (MIC) values in the range of 100 to 500 μg/mL against eighteen pathogenic microorganisms of concern for public health or zoonosis.
Synthesis and Antibacterial Activity of 1,3-Diallyltrisulfane Derivatives
Ren, Fang-Kui,He, Xiao-Yan,Deng, Li,Li, Bo-Heng,Shin, Dong-Soo,Li, Zhu-Bo Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.3
A series of novel 1,3-diallyltrisulfane analogues were synthesized and assayed in vitro for antimicrobial activity against Gram positive, Gram negative bacteria and fungi. The antimicrobial activity of the 1,3-diallyltrisulfane derivatives showed, on the whole, very potent towards all the tested Gram positive, Gram negative and fungi (MIC ranging from 4 to 256 μg/mL). 1,3-Di(pent-4-enyl)trisulfane 3b and 1,3-bis(3-methylbut-2-enyl)trisulfane 3e exhibited the strongest antibacterial activity among all the compounds, and both of them were more active than 1,3-diallyltrisulfane (DATS). Results indicated the relationship of either carbon number or lipophilicity with antimicrobial activity presented “V” shape. These observations provided some predictions in order to further design 1,3-diallyltrisulfane derivatives with antimicrobial activity.
In Vitro Hepatoprotective Compounds from Suaeda glauca
Ren-Bo An,Dong-Hwan Sohn,Gil-Saeng Jeong,Youn-Chul Kim 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.5
Bioassay-guided fractionation of the MeOH extract of Suaeda glauca yielded four phenolic compounds, methyl 3,5-di-O-caffeoyl quinate (1) and 3,5-di-O-caffeoyl quinic acid (2), isorhamnetin 3-O-β-D-galactoside (3), and quercetin 3-O-β-D-galactoside (4). Compounds 1 and 2 were hepatoprotective against tacrine-induced cytotoxicity in human liver-derived Hep G2 cells with the EC50 values of 72.7±6.2 and 117.2±10.5 μM, respectively. Silybin as a positive control showed an EC50 value of 82.4±4.1 μM.
Bo Ren 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.5
The structural vibration generated by building mounted small wind turbine was fully investigated by author. In order to achieve this, the real vibration condition of wind turbine in field was accurately simulated in Lab for research. There are some difficulty during the whole simulation process for further quantification of vibration levels. One of the main concerns was the correct estimation of the excitation or contact force at the interface between vibration source (turbine) and receiver (building or walls). However, the relevant simulation method in Lab is not available so far. In this paper, the direct measurement of force was investigated and found unsuitable. A new simulation method was proposed including solving the problem of power supply (DC electric motor used), automatic control of rotational speed of motor and indirect interface force determination. At last, the new established finite element models (FEM) was validated by experimental data with a good initial agreement.
Coumarins and Chromones from Angelica genuflexa
Ren Bo An,Bo-Young Park,Jung-Hee Kim,Ok-Kyoung Kwon,Joongku Lee,Byung-Sun Min,Kyung-Seop Ahn,Sei-Ryang Oh,Hyeong-Kyu Lee 한국생약학회 2005 Natural Product Sciences Vol.11 No.2
Thirteen compounds were isolated from the roots of Angelica genuflexa through repeated silica gelcolumn chromatography. Nine coumarins, isoimperatorin (1), osthol (2), demethylsuberosin (3), oxypeucedanin(4), heraclenin (5), pabulenol (7), umbelliferone (8), oxypeucedanin hydrate (9) and marmesinin (11), and fourchromones, hamaudol (6 10), sec-O-glucosylhamaudol (12) and prim-O-glucosylcimifugin (13), wereidentified by physicochemical and spectroscopic analysis. Among these, compounds 3, 5, 6, 8, 12, and 13 wereisolated for the first time from the roots of Angelica genuflexa. These coumarins and chromones were examinedfor their anticomplement activity. Demethylsuberosin (3) showed a weak anticomplement activity with an IC50value of 390M.