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Phuc Nguyen Thien,Giang Nguyen Thi Huong,An Vu Nguyen Thien Truong,Nam Nguyen Thanh Hoai,Anh Ly Duc,Nguyen Huynh Cam,An Hoang,Phong Mai Thanh,Hieu Nguyen Huu 한국탄소학회 2023 Carbon Letters Vol.33 No.2
In this study, graphene oxide (GO) was synthesized by the improved Hummers’ method. The degree of oxidation from graphite (Gi) to GO was determined through interlayer spacing calculated from X–ray diffraction. Besides, the effect of KMnO4:Gi ratios (X1), H2SO4 volume (X2), oxidation temperature (X3), oxidation time of stage 1 (X4), and oxidation time of stage 2 (X5) was screened by the Plackett–Burman model. The simultaneous impact of three factors that influenced the degree of oxidation (X1, X2, and X3) was studied by the Box–Behnken experimental model of response surface methodology to achieve suitable conditions for the GO synthesis process. The characterization of GO product was investigated via the modern analytical methods: X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, UV–Vis spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. In addition, the study was also carried out on a pilot scale for orientation in industrial application with the yield of 14 g/batch.
Anti-inflammatory tirucallane saponins from Paramignya scandens.
Phan, Nguyen Huu Toan,Thuan, Nguyen Thi Dieu,Ngoc, Ninh Thi,Thao, Nguyen Phuong,Kim, Sohyun,Koh, Young Sang,Thanh, Nguyen Van,Cuong, Nguyen Xuan,Nam, Nguyen Hoai,Kiem, Phan Van,Kim, Young Ho,Minh, Cha Pharmaceutical Society of Japan 2015 Chemical & pharmaceutical bulletin Vol.63 No.7
<P>Five new tirucallane saponins, paramignyosides A-E (1-5), were isolated from the water fraction of the Paramignya scandens stem and leaves. Their structures were elucidated on the basis of spectroscopic evidence including high-resolution electrospray ionization mass spectrometry (HR-ESI-MS) and one dimensional (1D)- and 2D-NMR. The effects of isolated compounds on pro-inflammatory cytokines were evaluated by measuring the production of interleukin (IL)-12 p40, IL-6, and tumor necrosis factor-α (TNF-α) in lipopolysaccharide (LPS)-stimulated bone marrow-derived dendritic cells (BMDCs). Paramignyoside C (3) exhibited selective and potent inhibitory effect (IC50=5.030.19??M) on the production of IL-12 p40 comparable to that of the positive control, SB203580 (IC50=5.000.16??M). Further studies are required to confirm efficacy in vivo and the mechanism of anti-inflammatory effects.</P>
Two New C-Glucosyl Benzoic Acids and Flavonoids from Mallotus nanus and Their Antioxidant Activity
Phan Van Kiem,Nguyen Thi Mai,Chau Van Minh,Nguyen Huu Khoi,Nguyen Hai Dang,Nguyen Phuong Thao,Nguyen Xuan Cuong,Nguyen Hoai Nam,Nguyen Xuan Nhiem,Yvan Vander Heyden,Joëlle Quetin-Leclercq,김교남,장해동,김영호 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.2
Two new 2-C-β-D-glucopyranosyl benzoic acid derivatives named mallonanosides A (1) and B (2) were isolated from the methanolic extract of the leaves of Mallotus nanus along with five known flavonoids, kaempferin (3), juglanin (4), quercitrin (5), myricitrin (6), and rhoifolin (7). Their structures were established on the basis of spectral and chemical evidence. Their antioxidant activities were shown to depend on the number of hydroxyl groups, and the location and species of sugar moiety.
A New Sterol from the Soft Coral Lobophytum crassum
Nguyen, Phuong Thao,Nguyen, Hoai Nam,Nguyen, Xuan Cuong,Nguyen, Xuan Nhiem,Pham, The Tung,Tran, Hong Quang,Nguyen, Thi Thanh Ngan,Phan, Van Kiem,Chau, Van Minh,Kim, Young Ho Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
Development of Biosensor for 3-Hydroxypropionic Acid
Nam Hoai Nguyen,Jung Rae Kim,SUNGHOON PARK 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.1
In this study, whole-cell biosensors that detect and indicate the concentration of 3-hydroxypropionic acid (3-HP) by producing a green fluorescent signal were developed using a transcription factor (TF)-responsive 3- HP inducible promoter identified in the Pseudomonas denitrificans 3-HP degradation pathway. Upon forming a complex with 3-HP, the MmsR TF protein, a LysR-type transcriptional regulator (LTTR), binds to the PmmsA promoter and controls the expression of the PmmsA-regulated gfp reporter gene in response to the concentration of 3-HP. Furthermore, by enhancing the expression of MmsR and through mutagenesis of the PmmsA promoter region, three well-performing biosensors were developed that covered a wide dynamic range of 3-HP (0.01-100 mM when added externally) with ~100-fold signal change upon induction in P. denitrificans. The 3-HP biosensor machinery, composed of MmsR, the PmmsA promoter and gfp could also function well in E. coli and P. putida. The developed 3-HP biosensors should be useful for engineering 3-HP-producing strains and the enzymes associated with its production.
Patchy approximate explicit model predictive control
Nguyen Hoai Nam,Sorin Olaru,Morten Hovd 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Multiparametric quadratic programming (MPQP) can be used to construct an off-line solution to constrained linear model predictive control. The result is a piecewise linear state feedback defined over polyhedral cells of the state space. However, with high dimensional problems, coding and implementation of this solution may be very burdensome for the available hardware, due to the high number of polyhedral cells in the state space partition. In this paper we provide an algorithm to find an approximate solution to MPQP, which is obtained by linear interpolation of the exact solution at the vertices of a feasible set and the solution of linear quadratic(LQ) problem. Based on a patchy control technique, we assure robust closed loop stability in the presence of additive measurement noise despite the presence of discontinuities at the switch between the regions in the state space partition.
Nguyen Ba Tiến,Hoai-Nam Nguyen,Hoang-Ha Le,Tran Thu Trang,Chau Van Dinh,Ha-Nam Nguyen,Gyoo Seok Choi 한국인터넷방송통신학회 2023 International Journal of Internet, Broadcasting an Vol.15 No.2
A common approach to the problem of predicting student test scores is based on the student's previous educational history. In this study, high school transcripts of about two thousand candidates, who took the High-school Student Assessment (HSA) were collected. The data were estimated through building a regression model - Random Forest and optimizing the model's parameters based on Genetic Algorithm (GA) to predict the HSA scores. The RMSE (Root Mean Square Error) measure of the predictive models was used to evaluate the model’s performance.
Triterpenoid saponins from the roots of Rosa rugosa Thunb. as rat intestinal sucrase inhibitors
Nguyen Phuong Thao,Bui Thi Thuy Luyen,주성호,Tran Manh Hung,Nguyen Xuan Cuong,Nguyen Hoai Nam,권영인,Chau Van Minh,김영호 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.10
Medicinal plants constitute an important sourceof potential therapeutic agents for diabetes. The purpose ofpresent study is to investigate the effect of root extract ofRosa rugosa Thunb. on inhibition of sucrase related todiabetes mellitus (DM). Bioassay-guided fractionation ofthe methanol extract led to the identification of 13 triterpenoidsaponins (1–13). Their structures were elucidatedon the basis of extensive spectroscopic analysis, including1D, 2D NMR, and MS. The n-butanol fraction showedpotent rat intestinal sucrase inhibitory activity with value of87.62 ± 5.84 % inhibition compared to the positive controlacarbose (50.96 ± 2.97 % inhibition at 0.02 mM). Subsequently, compounds 11–13 (1.0 mM) exhibited significantsucrase inhibitory activity, with inhibition percentagevalues of 41.17 ± 3.52, 46.80 ± 4.00, and39.39 ± 4.19 %, respectively. Whereas, compounds 2–6,8, and 10 showed moderate sucrase inhibitory activity(ranging from 13.26 ± 7.00 to 32.08 ± 6.04 % inhibition)at a same concentration. The data provide a starting pointfor creating new sucrase inhibitors, which may be usefulfor the development of effective therapies for the treatmentof DM.