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Jasminum attenuatum Roxb. ex G. Don (Oleaceae): a new record to the flora of Vietnam
Bui Hong Quang,Tran The Bach,Ritesh Kumar Choudhary,이창영,이중구 한국식물분류학회 2013 식물 분류학회지 Vol.43 No.4
Jasminum attenuatum Roxb. ex G. Don, a species of Oleaceae, was recently found in Kon Ka Kinh National Park of Vietnam that represents a new record to the flora of the country. The plant can be differentiated from its allied species J. latipetalum C.B. Clarke and J. simplicifolium subsp. funale (Decne) Kiew by the shape of its leaf blade, in having 5-20 flowered inflorescence, linear bracts, and obconic and glabrous calyx with shorter lobes. The present study provides the species description, illustrations, micrographs by scanning electron microscope of the pollen grains, and important taxonomic notes. Furthermore, a comparison of the diagnostic characters between this species and the above mentioned related species is made.
Quang, Tran Hong,Ngan, Nguyen Thi Thanh,Minh, Chau Van,Kiem, Phan Van,Nhiem, Nguyen Xuan,Tai, Bui Huu,Thao, Nguyen Phuong,Luyen, Bui Thi Thuy,Song, Seok-Bean,Kim, Young-Ho Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.11
A new compound, kalopanaxin F (3), and 11 known compounds (1, 2, 4-12), were isolated from the stem bark of Kalopanax pictus. Their structures were elucidated on the basis of chemical and spectroscopic methods. Five of the compounds (2, 3, 5, 6, and 12) significantly inhibited $TNF{\alpha}$-induced NF-${\kappa}B$ transcriptional activity in HepG2 cells in a dose-dependent manner, with $IC_{50}$ values ranging from 6.2 to 9.1 ${\mu}M$. Furthermore, the transcriptional inhibitory function of these compounds was confirmed based on decreases in COX-2 and iNOS gene expression in HepG2 cells. Compounds 3-7, 9, and 12 significantly activated the transcriptional activity of PPARs dose-dependently, with $EC_{50}$ values ranging from 4.1-$12.7{\mu}M$. Compounds 4 and 5 exhibited $PPAR{\alpha}$, $PPAR{\gamma}$, and $PPAR{\beta}({\delta})$ transactivational activities in a dose-dependent manner, with $EC_{50}$ values of 16.0 and 17.0, 8.7 and 16.5, 26.2 and 26.3 ${\mu}M$, respectively.
Jasminum albicalyx Kobuski (Oleaceae): a new record from Vietnam
Bui Hong Quang,Ritesh Kumar Choudhary,Tran The Bach,Vu Tien Chinh,Nguyen Sinh Khang,이창영,이중구 한국식물분류학회 2014 식물 분류학회지 Vol.44 No.3
We report a new record of Jasminum albicalyx Kobuski in Vietnam. The plant differs from J. pedunculatum Gagnep., a closely related taxon, by foliar and floral characters such as less number of lateral veins, presence of domatia at vein axils on the abaxial surface of leaf, smaller bracts, white calyx having more number of lobes and less number of lobes in corolla. Morphological description, line drawing and color photographs are provided in addition to the species key of allied species of Jasminum albicalyx in Vietnam.
Bui Hong Quang,Ritesh Kumar Choudhary,이중구 충남대학교 농업과학연구소 2019 Korean Journal of Agricultural Science Vol.46 No.2
Two species of Leycesteria, L. gracilis (Kurz) Airy Shaw and L. formosa Wall. (Caprifoliaceae), from the Lao Cai and Yen Bai Provinces are reported here as a new generic record for the flora of Vietnam. During floristic surveys of northern Vietnam, L. gracilis and L. Formosa were encountered. A critical morphological study of all the collected specimens and the type of materials consulting the relevant literature led us to confirm the identity of our collected specimens as L. gracilis and L. formosa. The genus differs from other Vietnamese genera of Caprifoliaceae by the presence of a spike inflorescence or flowers in sessile whorls of 6. Taxonomic notes, description, and photographs are provided, together with short notes on the distribution, ecology and phenology of the two species.
Bui Hung Thang,Pham Van Trinh,Le Dinh Quang,Nguyen Thi Huong,Phan Hong Khoi,Phan Ngoc Minh 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.3
Carbon nanotubes (CNTs) are some of the most valuable materials with high thermal conductivity. The thermal conductivity of individual multiwalled carbon nanotubes (MWCNTs) grown byusing chemical vapor deposition is 600 ± 100 Wm−1K−1 compared with the thermal conductivity419 Wm−1K−1 of Ag. Carbon-nanotube-based liquids – a new class of nanomaterials, have shownmany interesting properties and distinctive features offering potential in heat dissipation applicationsfor electronic devices, such as computer microprocessor, high power LED, etc. In this work,a multiwalled carbon-nanotube-based liquid was made of well-dispersed hydroxyl-functional multiwalledcarbon nanotubes (MWCNT-OH) in ethylene glycol (EG)/distilled water (DW) solutionsby using Tween-80 surfactant and an ultrasonication method. The concentration of MWCNT-OHin EG/DW solutions ranged from 0.1 to 1.2 gram/liter. The dispersion of the MWCNT-OH-basedEG/DW solutions was evaluated by using a Zeta-Sizer analyzer. The MWCNT-OH-based EG/DWsolutions were used as coolants in the liquid cooling system for the Intel Core i5 processor. Thethermal dissipation efficiency and the thermal response of the system were evaluated by directlymeasuring the temperature of the micro-processor using the Core Temp software and the temperaturesensors built inside the micro-processor. The results confirmed the advantages of CNTs inthermal dissipation systems for computer processors and other high-power electronic devices.
α-Glucosidase Inhibitors from the Roots of Sophora flavescens
Quang, Tran Hong,Ngan, Nguyen Thi Thanh,Minh, Chau Van,Kiem, Phan Van,Tai, Bui Huu,Thao, Nguyen Phuong,Kwon, Se-Uk,Lee, Young-Mi,Kang, Hee-Kyoung,Kim, Young-Ho Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
Bui Quang Hung,Mihee Hong,Won-Jae Yu,Hee Moon Kyung 대한치과교정학회 2020 대한치과교정학회지 Vol.50 No.1
Objective: The Heat Induction Typodont System (HITS), used in some recent studies, has a distinct advantage over previous tooth movement simulation methods. This study aimed to compare inclination and vertical changes between the single-wire and double-wire techniques during en masse retraction with different lengths of lever arms in lingual orthodontics using an upgraded version of the HITS. Methods: Duet lingual brackets, which have two main slots, were used in this study. Forty samples were divided into four groups according to the length of the lever arm (3-mm or 6-mm hook) and the retraction wire (singlewire or double-wire). Four millimeters of en masse retraction was performed using lingual appliances. Thereafter, 3-dimensional–scanned images of the typodont were analyzed to measure inclination and vertical changes of the anterior teeth. Results: Incisor inclination presented more changes in the singlewire groups than in the double-wire groups. However, canine inclination did not differ between these groups. Regarding vertical changes, only the lateral incisors in the single-wire groups presented significantly larger values than did those in the double-wire groups. Combining the effect of hook lengths, among the four groups, the single-wire group with the 3-mm hook had the highest value, while the double-wire group with the 6-mm hook showed the least decrease in crown inclination and extrusion. Conclusions: The double-wire technique with an extended lever arm provided advantages over the single-wire technique with the same lever arm length in preventing torque loss and extrusion of the anterior teeth during en masse retraction in lingual orthodontics.
Tran Hong Quang,Seok Bean Song,Bui Thi Thuy Luyen,Nguyen Phuong Thao,BUIHUU TAI,Nguyen Xuan Nhiem,Phan Van Kiem,Chau Van Minh,Nguyen Thi Thanh Ngan,김영호 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.11
A new compound, kalopanaxin F (3), and 11 known compounds (1, 2, 4-12), were isolated from the stem bark of Kalopanax pictus. Their structures were elucidated on the basis of chemical and spectroscopic methods. Five of the compounds (2, 3, 5, 6, and 12) significantly inhibited TNFα-induced NF-κB transcriptional activity in HepG2 cells in a dose-dependent manner, with IC50 values ranging from 6.2 to 9.1 μM. Furthermore, the transcriptional inhibitory function of these compounds was confirmed based on decreases in COX-2 and iNOS gene expression in HepG2 cells. Compounds 3-7, 9, and 12 significantly activated the transcriptional activity of PPARs dose-dependently, with EC50 values ranging from 4.1-12.7 μM. Compounds 4 and 5 exhibited PPARα, PPARγ, and PPARβ(δ) transactivational activities in a dose-dependent manner, with EC50 values of 16.0 and 17.0, 8.7 and 16.5, 26.2 and 26.3 μM, respectively.