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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
Anti-inflammatory Asterosaponins from the Starfish <i>Astropecten monacanthus</i>
Thao, Nguyen Phuong,Cuong, Nguyen Xuan,Luyen, Bui Thi Thuy,Thanh, Nguyen Van,Nhiem, Nguyen Xuan,Koh, Young-Sang,Ly, Bui Minh,Nam, Nguyen Hoai,Kiem, Phan Van,Minh, Chau Van,Kim, Young Ho American Chemical Society and American Society of 2013 Journal of natural products Vol.76 No.9
<P>Four new asterosaponins, astrosteriosides A–D (<B>1</B>–<B>3</B> and <B>5</B>), and two known compounds, psilasteroside (<B>4</B>) and marthasteroside B (<B>6</B>), were isolated from the MeOH extract of the edible Vietnamese starfish <I>Astropecten monacanthus</I>. Their structures were elucidated by chemical and spectroscopic methods including FTICRMS and 1D and 2D NMR experiments. The effects of the extracts and isolated compounds on pro-inflammatory cytokines were evaluated by measuring the production of IL-12 p40, IL-6, and TNF-α in LPS-stimulated bone marrow-derived dendritic cells. Compounds <B>1</B>, <B>5</B>, and <B>6</B> exhibited potent anti-inflammatory activity comparable to that of the positive control. Further studies are required to confirm efficacy <I>in vivo</I> and the mechanism of effects. Such potent anti-inflammatory activities render compounds <B>1</B>, <B>5</B>, and <B>6</B> important materials for further applications including complementary inflammation remedies and/or functional foods and nutraceuticals.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2013/jnprdf.2013.76.issue-9/np400492a/production/images/medium/np-2013-00492a_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np400492a'>ACS Electronic Supporting Info</A></P>
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>
Triterpenoids from aerial parts of Glochidion eriocarpum.
Thu, Vu Kim,Kiem, Phan Van,Yen, Pham Hai,Nhiem, Nguyen Xuan,Tung, Nguyen Huu,Cuong, Nguyen Xuan,Minh, Chau Van,Huong, Hoang Thanh,Lau, Trinh Van,Thuan, Ngo Thi,Kim, Young Ho Natural Product Communications 2010 Natural product communications Vol.5 No.3
<P>From the aerial parts of Glochidion eriocarpum, a new triterpene, glochieriol (1), three new triterpenoid saponins, glochieriosides C - E (2 - 4), together with four known triterpenes (glochidonol, glochidiol, lupeol, and 3-epi-lupeol) were isolated by using combined chromatographic separations. The structures of the new compounds were elucidated on the basis of spectroscopic data, including FTICR-MS, 1D and 2D NMR.</P>
High-Resolution Simulations for Vietnam - Methodology and Evaluation of Current Climate
Jack Katzfey,Kim Nguyen,John McGregor,Peter Hoffmann,Suppiah Ramasamy,Hiep Van Nguyen,Mai Van Khiem,Thang Van Nguyen,Kien Ba Truong,Thang Van Vu,Hien Thuan Nguyen,Tran Thuc,Doan Ha Phong,Bang Thanh Ng 한국기상학회 2016 Asia-Pacific Journal of Atmospheric Sciences Vol.52 No.2
To assist the government of Vietnam in its efforts to better understand the impacts of climate change and prioritise its adaptation measures, dynamically downscaled climate change projections were produced across Vietnam. Two Regional Climate Models (RCMs) were used: CSIRO’s variable-resolution Conformal-Cubic Atmospheric Model (CCAM) and the limited-area model Regional Climate Model system version 4.2 (RegCM4.2). First, global CCAM simulations were completed using bias- and variance-corrected sea surface temperatures as well as sea ice concentrations from six Coupled Model Intercomparison Project Phase 5 (CMIP5) global climate models. This approach is different from other downscaling approaches as it does not use any atmospheric fields from the GCMs. The global CCAM simulations were then further downscaled to 10 km using CCAM and to 20 km using RegCM4.2. Evaluations of temperature and precipitation for the current climate (1980-2000) were completed using station data as well as various gridded observational datasets. The RCMs were able to reproduce reasonably well most of the important characteristics of observed spatial patterns and annual cycles of temperature. Average and minimum temperatures were well simulated (biases generally less than 1oC), while maximum temperatures had biases of around 1oC. For precipitation, although the RCMs captured the annual cycle, RegCM4.2 was too dry in Oct.-Nov. (−60% bias), while CCAM was too wet in Dec.- Mar. (130% bias). Both models were too dry in summer and too wet in winter (especially in northern Vietnam). The ability of the ensemble simulations to capture current climate increases confidence in the simulations of future climate.
Azimuthal angle dependent dielectric function of SnS by ellipsometry
Nguyen Xuan Au,Jung Yong Woo,Kim Young Dong,Van Le Long,Nguyen Hoang Tung,Kim Tae Jung 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.1
Since α-SnS has optically strong anisotropic characteristics, a simple method to determine its crystal orientation is strongly needed in device engineering. In this report, by measuring dielectric function ε = ε1 + iε2 of α-SnS in the 1–5 eV spectral region with the full azimuthal angle range, we could find a simple relationship between measured dielectric function values and the orientation of the α-SnS crystal axis. Therefore, during the device manufacturing process, one can use spectroscopic ellipsometry to quickly measure the dielectric response of the α-SnS region of the device to correctly orient the SnS along the preferred direction for the best performance of the device. We also performed the azimuthal angle-dependent analysis of the critical points (CP) analysis, which shows that the positions of CP energies are basically invariant, while their amplitudes and lineshapes strongly depend on the azimuthal angle.
Port System in the Central Vietnam in Champa Era: A View from the Viet -Cham Relation
( Nguyen Van Kim ) 부경대학교 글로벌지역학연구소 2019 Journal of Global and Area Studies(JGA) Vol.3 No.1
In the course of her history, Champa established and maintained maritime commercial and economic relationships with Asian nations and beyond. The Cham people inherited the cultural achievements from earlier cultures and created the essential basis for the development of the Viet people when these communities arrived in and explored the Southern territory. This helped them not only to maintain their traditional culture, but also to integrate into the newly created thought and spirituality. The Viet government did not only operate the old Champa commercial ports but also explored new ports and took the chance for development. They established more relations with Asian and European trading partners; maintained the trading routines between in South - North and West - East directions and did not only carry out the traditional trade, but also reached for the Mercantilism. Those helped the Viet people to claim their role and position in the foreign relation with the area for centuries.
Hadoop-based System for Analysis Big Social Sensor Data
Van Quan Nguyen,Linh Van Ma,Jinsul Kim 한국정보기술학회 2018 Proceedings of KIIT Conference Vol.2018 No.6
요즘 많은 분석 데이터가 많은 업무에서 중요 해지고 있습니다. 데이터는 산업 시스템의 과학, 의학, 기상, 금융, 마케팅 또는 센서 데이터 일 수도 있고 소셜 네트워크의 소셜 데이터 일 수도 있습니다. Hadoop 프레임워크는 현재 분산 데이터뿐 아니라 대용량 데이터 처리를위한 최상의 선택이되고 있습니다. 이 백서에서는 Hadoop 분산 파일 시스템 (HDFS)에 MapReduce 기반 아키텍처를 배포하여 여러 사용자가 재난에 대해 수집한 사회적 센서 데이터를 처리합니다. 기상청이 예상하고 예측하고 주민에게 경고문을 게시하려면이 큰 데이터를 실시간으로 수집, 저장 및 처리해야합니다. Nowadays large analysis amount of data has become important for many tasks. Data could be scientific, medical, meteorological, financial, marketing or sensor data from industrial system even social data from the social network. Hadoop framework is currently becoming the best choice for big data processing as well as distributed data. This paper deployed MapReduce based architecture on Hadoop Distributed File System (HDFS) to process social sensor data which is collected from multiple users about the disaster. Real-time collecting, storing and processing of this big data is necessary for the meteorological department to forecast as well as publish the warning to residents.
( Van Nam Nguyen ),( Wan Taek Ju ),( Young Ju Kim ),( Woo Jin Jung ),( Kil Yong Kim ),( Ro Dong Park ) 한국키틴키토산학회 2014 한국키틴키토산학회지 Vol.19 No.2
Two chitinolytic and egg-parasitic fungi Lecanicillium psalliotaeA-1 and Lecanicillium antillanum B-3 were isolated and identified for biocontrol of M. incognita in cucumber field. They were cultivated, and mycelial biomass has been formulated and treated to the soil to evaluate their nematicidal activity on suppressing root-knot nematode M. incognita on cucumber plants in greenhouse. The chitinolytic fungi reduced cucumber root galls by 71.8, 60.3, and 47.4% in B-3, A-1+B-3, and A-1 treatment, respectively. In addition, nematode population in cucumber root was also reduced by 79.8, 62.0, and 37.9% in B-3, A-1+B-3, and A-1 treatments after 7 weeks of cucumber growth. Moreover, B-3 treatment improved significantly cucumber growth. The results demonstrate that the fungi B-3 and A-1 showed effectiveness of biological control of M. incognita on cucumber in pot experiment. These results demonstrate that the isolated fungi L. antillanum B-3 and L. psalliotae A-1 hold a high potential in egg parasitism and could be biological control agent against M. incognita in cucumber field.
Van Nguyen Tuan,Do Ha Huu,Tekalgne Mahider,Van Le Quyet,Nguyen Thang Phan,Hong Sung Hyun,Cho Jin Hyuk,Van Dao Dung,Ahn Sang Hyun,Kim Soo Young 나노기술연구협의회 2021 Nano Convergence Vol.8 No.33
Following publication of the original article [1], the affiliation of the authors was incorrectly published in the article. The affiliation which was shown in supplementary information is correct. This has been corrected with this erratum.