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Nguyen Van Hung,Bui Thi Minh Nguyet,Nguyen Huu Nghi,Nguyen Minh Luon,Nguyen Ngoc Bich,Le Van Thanh Son,Nguyen Trung Kien,Dao Ngoc Nhiem,Nguyen Thanh Tuoi,Dinh Quang Khieu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.4
In the present work, ZnO/g-C₃N₄/biochar was prepared, and it was used for visible-light driven photocatalytic degradation of some colorants (methylene blue, rhodamine B, methyl orange) and some antibiotics (doxycycline, ciprofloxacin, amoxicilline). Biochar was prepared by pyrolysing Phragmites australis biomass. The ZnO/g-C₃N₄/biochar composite was synthesized with the alkaline hydrolysis method. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, transition electron microscopy, energy dispersive X-ray/elemental mapping, ultraviolet-visible-diffuse reflectance spectroscopy, photoluminescence spectroscopy, nitrogen adsorption/desorption isotherms and X-ray photoelectron spectroscopy. The results show that ZnO nanoparticles with a large surface area are highly dispersed on the g-C₃N₄ particle surface and biochar. The composite exhibits superior photocatalytic degradation ability toward doxycycline, a broad-spectrum antibiotic of the tetracycline compared with individual components (ZnO or g-C₃N₄) and satisfies stability after six treatment cycles. The kinetics and degradation mechanisms of doxycyline were also addressed. In addition, the present catalyst also exhibits the photocatalytic degradation of methylene blue, rhodamine B, methyl orange, ciprofloxacin and amoxicillin in visible-light regions.
Truong Giang Nguyen,Thanh Khiem Nguyen,Ham Hoi Nguyen,Hong Son Trinh,Tuan Hiep Luong,Minh Trong Nguyen,Van Duy Le,Hai Dang Do,Kieu Hung Nguyen,Van Minh Do,Quang Huy Tran,Cuong Thinh Nguyen 한국간담췌외과학회 2024 Annals of hepato-biliary-pancreatic surgery Vol.28 No.1
Backgrounds/Aims: Parenchymal-sparing anatomical hepatectomy (Ps–AH) based on portal ramification of the right anterior section (RAS) is a new technique to avoid unnecessarily transecting too much liver parenchyma, especially in cases of major anatomical hepatectomy. Methods: We prospectively assessed 26 patients with primary hepatic malignancies having undergone major Ps–AH based on portal ramification of the RAS from August 2018 to August 2022 (48 months). The perioperative indications, clinical data, intra-operative index, pathological postoperative specimens, postoperative complications, and follow-up results were retrospectively evaluated. Results: Among the 26 patients analyzed, there was just one case that had intrahepatic cholangiocarcinoma The preoperative level of α– Fetoprotein was 25.2 ng/mL. All cases (100%) had Child–Pugh A liver function preoperatively. The ventral/dorsal RAS was preserved in 19 and 7 patients, respectively. The mean surgical margin was 6.2 mm. The mean surgical time was 228.5 minutes, while the mean blood loss was 255 mL. In pathology, 5 cases (19.2%) had microvascular invasion, and in the group of HCC patients, 92% of all cases had moderate or poor tumor differentiation. Six cases (23.1%) of postoperative complications were graded over III according to the Clavien–Dindo system, including in three patients resistant ascites or intra-abdominal abscess that required intervention. Conclusions: Parenchymal-sparing anatomical hepatectomy based on portal ramification of the RAS to achieve R0-resection was safe and effective, with favorable short-term outcomes. This technique can be used widely in clinical practice.
Anti-inflammatory Triterpenoid Saponins from the Stem Bark of <i>Kalopanax pictus</i>
Quang, Tran H.,Ngan, Nguyen T. T.,Minh, Chau V.,Kiem, Phan V.,Nhiem, Nguyen X.,Tai, Bui H.,Thao, Nguyen P.,Tung, Nguyen H.,Song, Seok B.,Kim, Young H. American Chemical Society and American Society of 2011 Journal of natural products Vol.74 No.9
<P>Five new compounds, 16,23,29-trihydroxy-3-oxo-olean-12-en-28-oic acid (<B>1</B>), 4,23,29-trihydroxy-3,4-<I>seco</I>-olean-12-en-3-oate-28-oic acid (<B>2</B>), 3β,6β,23-trihydroxyolean-12-en-28-oic acid 28-<I>O</I>-β-<SMALL>d</SMALL>-glucopyranoside (<B>3</B>), 3-<I>O</I>-[2,3-di<I>-O</I>-acetyl-α-<SMALL>l</SMALL>-arabinopyranosyl]hederagenin 28-<I>O</I>-α-<SMALL>l</SMALL>-rhamnopyranosyl-(1→4)-β-<SMALL>d</SMALL>-glucopyranosyl-(1→6)-β-<SMALL>d</SMALL>-glucopyranoside (<B>4</B>), and 3-<I>O</I>-[3,4-di-<I>O</I>-acetyl-α-<SMALL>l</SMALL>-arabinopyranosyl]hederagenin 28-<I>O</I>-α-<SMALL>l</SMALL>-rhamnopyranosyl-(1→4)-β-<SMALL>d</SMALL>-glucopyranosyl-(1→6)-β-<SMALL>d</SMALL>-glucopyranoside (<B>5</B>), as well as 10 known compounds (<B>6</B>–<B>15</B>), were isolated from the stem bark of <I>Kalopanax pictus</I>. Compounds <B>1</B>–<B>5</B> and <B>7</B>–<B>14</B> inhibited TNFα-induced NF-κB transcriptional activity in HepG2 cells in a dose-dependent manner, with IC<SUB>50</SUB> values ranging from 0.6<B></B>to 16.4 μM. Furthermore, the transcriptional inhibitory function of these compounds was confirmed on the basis of decreases in COX-2 and iNOS gene expression in HepG2 cells. The structure–activity relationship of the compounds with respect to anti-inflammatory activity is also discussed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jnprdf/2011/jnprdf.2011.74.issue-9/np200382s/production/images/medium/np-2011-00382s_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np200382s'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/np200382s'>ACS Electronic Supporting Info</A></P>
Carbon-Nanotube Growth over Iron Nanoparticles Formed on CaCO3 Support by Using Hydrogen Reduction
Nguyen Duc Dung,Nguyen Van Chuc,Ngo Thi Thanh Tam,Nguyen Hong Quang,Phan Hong Khoi,Phan Ngoc Minh 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Carbon nanotubes (CNTs) were grown by chemical vapor deposition on a mixture of iron salt and CaCO3. Salt mixtures of Fe(NO₃)₃9H₂O/CaCO₃ and FeCl₃6H₂O/CaCO₃ with various Fe weight contents were used as catalysts for growing the CNTs. A scanning electron microscope study revealed that the CNTs were densely grown on the Fe(NO₃)₃9H₂O/CaCO₃ catalyst containing 5 wt.% Fe. The effect of growth temperature on the segregation of Fe nanoparticles formed by hydrogen reduction is discussed. The result shows that 800 ℃ is the optimal temperature for the formation of Fe nanoparticles over which CNTs grow with the highest yield of 78.61 %. A raman spectroscope and a scanning transmission electron microscope were utilized to characterize the multiwall structure of the CNTs. The 92.16 % purity of the CNTs was determined by using thermal gravimetric analysis. Carbon nanotubes (CNTs) were grown by chemical vapor deposition on a mixture of iron salt and CaCO3. Salt mixtures of Fe(NO₃)₃9H₂O/CaCO₃ and FeCl₃6H₂O/CaCO₃ with various Fe weight contents were used as catalysts for growing the CNTs. A scanning electron microscope study revealed that the CNTs were densely grown on the Fe(NO₃)₃9H₂O/CaCO₃ catalyst containing 5 wt.% Fe. The effect of growth temperature on the segregation of Fe nanoparticles formed by hydrogen reduction is discussed. The result shows that 800 ℃ is the optimal temperature for the formation of Fe nanoparticles over which CNTs grow with the highest yield of 78.61 %. A raman spectroscope and a scanning transmission electron microscope were utilized to characterize the multiwall structure of the CNTs. The 92.16 % purity of the CNTs was determined by using thermal gravimetric analysis.
Nguyen Quang Minh,Nguyen Thi Thu Huong 한국측량학회 2013 한국측량학회지 Vol.31 No.6
Spatial resolution of land covers from remotely sensed images can be increased using super-resolutionmapping techniques for soft-classified land cover proportions. A further development of super-resolutionmapping technique is downscaling the original remotely sensed image using super-resolution mappingtechniques with a forward model. In this paper, the model for increasing spatial resolution of remote sensingmultispectral image is tested with real SPOT 5 imagery at 10m spatial resolution for an area in Bac GiangProvince, Vietnam in order to evaluate the feasibility of application of this model to the real imagery. The softclassifiedland cover proportions obtained using a fuzzy c-means classification are then used as input data fora Hopfield neural network (HNN) to predict the multispectral images at sub-pixel spatial resolution. The 10mSPOT multispectral image was improved to 5m, 3,3m and 2.5m and compared with SPOT Panchromatic imageat 2.5m resolution for assessment.Visually, the resulted image is compared with a SPOT 5 panchromatic imageacquired at the same time with the multispectral data. The predicted image is apparently sharper than theoriginal coarse spatial resolution image.
Minh, Nguyen Quang,Huong, Nguyen Thi Thu Korean Society of Surveying 2013 한국측량학회지 Vol.31 No.6
Spatial resolution of land covers from remotely sensed images can be increased using super-resolution mapping techniques for soft-classified land cover proportions. A further development of super-resolution mapping technique is downscaling the original remotely sensed image using super-resolution mapping techniques with a forward model. In this paper, the model for increasing spatial resolution of remote sensing multispectral image is tested with real SPOT 5 imagery at 10m spatial resolution for an area in Bac Giang Province, Vietnam in order to evaluate the feasibility of application of this model to the real imagery. The soft-classified land cover proportions obtained using a fuzzy c-means classification are then used as input data for a Hopfield neural network (HNN) to predict the multispectral images at sub-pixel spatial resolution. The 10m SPOT multispectral image was improved to 5m, 3,3m and 2.5m and compared with SPOT Panchromatic image at 2.5m resolution for assessment.Visually, the resulted image is compared with a SPOT 5 panchromatic image acquired at the same time with the multispectral data. The predicted image is apparently sharper than the original coarse spatial resolution image.
Nguyen Xuan Nhiem,Pham Hai Yen,Nguyen Thi Thanh Ngan,TRANHONG QUANG,Phan Van Kiem,Chau Van Minh,Bui Huu Tai,Nguyen Xuan Cuong,Seok Bean Song,김영호 한국식품영양과학회 2012 Journal of medicinal food Vol.15 No.4
Momordica charantia is used to treat various diseases, including inflammatory conditions. Previous reports indicated that the extract of this plant inhibits activation of nuclear transcription factor-jB (NF-jB) but activates peroxisome proliferator-activated receptor (PPAR). Additionally, cucurbitane-type triterpene glycosides are the main bioactive components of the fruit of M. charantia. Therefore, we investigated the anti-inflammatory activity of 17 cucurbitane-type triterpene glycosides (1–17) isolated from this plant. Their inhibition of NF-jB and activation of PPAR activities in HepG2 cells were measured using luciferase reporter and PPAR subtype transactivation assays. Compounds 6 and 8 were found to inhibit NF-jB activation stimulated by tumor necrosis factor-a (TNFa) in a dose-dependent manner. With 50% inhibition concentration (IC50) values of 0.4 lM, compounds 6 and 8 were more potent inhibitors than the positive control, sulfasalazine (IC50 = 0.9lM). Compounds 4, 6, and 8 also inhibited TNFa-induced expressions of inducible nitric oxide synthase and cyclooxygenase-2mRNA. However, only compound 13 significantly increased PPARc transactivation.