9 results on '"Thi Bui"'
Search Results
2. Corrosion Inhibition of Mild Steel in Hydrochloric Acid Environments Containing Sonneratia caseolaris Leaf Extract
- Author
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Manh, Tran Dinh, primary, Huynh, Thanh Liem, additional, Thi, Bui Viet, additional, Lee, Sunhwa, additional, Yi, Junsin, additional, and Nguyen Dang, Nam, additional
- Published
- 2022
- Full Text
- View/download PDF
3. Ergosterol-Induced Ordered Phase in Ternary Lipid Mixture Systems of Unsaturated and Saturated Phospholipid Membranes
- Author
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Keishi Suga, Hiroshi Umakoshi, and Tham Thi Bui
- Subjects
genetic structures ,Phospholipid ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,Ergosterol ,0103 physical sciences ,Monolayer ,Materials Chemistry ,Membrane fluidity ,Physical and Theoretical Chemistry ,Phospholipids ,010304 chemical physics ,Bilayer ,Cell Membrane ,technology, industry, and agriculture ,eye diseases ,Sterol ,0104 chemical sciences ,Surfaces, Coatings and Films ,Cholesterol ,Membrane ,chemistry ,Biophysics ,lipids (amino acids, peptides, and proteins) ,sense organs ,Erg - Abstract
The sterol ergosterol (Erg) is ubiquitous in the membranes of lower eukaryotes such as fungi. To investigate the interactions between Erg and phosphocholine (PC) molecules, we studied ternary lipid mixture systems composed of unsaturated 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), saturated 1,2-dipalmitoyl-sn-glycero-3-phophocholine (DPPC), and Erg. Bilayer membrane fluidity and polarity were systematically analyzed using fluorescent probes. The presence of ≥30 mol % of Erg exhibited a significant ordering effect and stabilized membrane properties when temperatures increased, suggesting that Erg has a similar function to cholesterol (Chol) in comparable lipid systems that form a liquid-ordered phase. Erg was also observed to have a significant condensing effect at the monolayer level in saturated PC-enriched systems. The phase behavior of Erg in bilayer systems was compared with that of Chol, with the data suggesting that Erg behaves in a similar manner to Chol in membranes enriched with saturated lipids.
- Published
- 2019
4. Interfacial Engineering of Nanoporous Architectures in Ga2O3 Film toward Self-Aligned Tubular Nanostructure with an Enhanced Photocatalytic Activity on Water Splitting
- Author
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Yong-Young Noh, Hoa Thi Bui, Taegweon Lee, and Nabeen K. Shrestha
- Subjects
Nanostructure ,Materials science ,Anodizing ,Nanoporous ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,Surfaces and Interfaces ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Isotropic etching ,0104 chemical sciences ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Electrochemistry ,Water splitting ,General Materials Science ,Gallium ,0210 nano-technology ,Spectroscopy - Abstract
The present work demonstrates the formation of self-aligned nanoporous architecture of gallium oxide by anodization of gallium metal film controlled at −15 °C in aqueous electrolyte consisting of phosphoric acid. SEM examination of the anodized film reveals that by adding ethylene glycol to the electrolyte and optimizing the ratio of phosphoric acid and water, chemical etching at the oxide/electrolyte interfaces can be controlled, leading to the formation of aligned nanotubular oxide structures with closed bottom. XPS analysis confirms the chemical composition of the oxide film as Ga2O3. Further, XRD and SAED examination reveals that the as-synthesized nanotubular structure is amorphous, and can be crystallized to β-Ga2O3 phase by annealing the film at 600 °C. The nanotubular structured film, when used as photoanode for photoelectrochemical splitting of water, achieved a higher photocurrent of about two folds than that of the nanoporous film, demonstrating the rewarding effect of the nanotubular structure...
- Published
- 2018
5. Anodically Grown Binder-Free Nickel Hexacyanoferrate Film: Toward Efficient Water Reduction and Hexacyanoferrate Film Based Full Device for Overall Water Splitting
- Author
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Nabeen K. Shrestha, Yong-Young Noh, Chinna Bathula, Hoa Thi Bui, Sung-Hwan Han, Shubhangi Khadtare, and Lars Giebeler
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Prussian blue ,Materials science ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,Electrolyte ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrocatalyst ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Nickel ,chemistry ,Water splitting ,General Materials Science ,Ferricyanide ,Thin film ,0210 nano-technology - Abstract
One of the challenges in obtaining hydrogen economically by electrochemical water splitting is to identify and substitute cost-effective earth-abundant materials for the traditionally used precious-metal-based water-splitting electrocatalysts. Herein, we report the electrochemical formation of a thin film of nickel-based Prussian blue analogue hexacyanoferrate (Ni-HCF) through the anodization of a nickel substrate in ferricyanide electrolyte. As compared to the traditionally used Nafion-binder-based bulk film, the anodically obtained binder-free Ni-HCF film demonstrates superior performance in the electrochemical hydrogen evolution reaction (HER), which is highly competitive with that shown by a Pt-plate electrode. The HER onset and the benchmark cathodic current density of 10 mA cm–2 were achieved at small overpotentials of 15 mV and 0.2 V (not iR-corrected), respectively, in 1 M KOH electrolyte, together with the long-term electrochemical durability of the film. Further, a metal-HCF-electrode-based full...
- Published
- 2017
6. Advantages of Mobile Liquid-Crystal Phase of AIE Luminogens for Effective Solid-State Emission
- Author
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Hoa Thi Bui, Jinhee Kim, Sung Cho, Byoung-Ki Cho, and Ho-Joong Kim
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Ethylene oxide ,business.industry ,Solid-state ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Dipole ,General Energy ,chemistry ,Liquid crystal ,Homogeneous ,Phase (matter) ,Optoelectronics ,Polar ,Physical and Theoretical Chemistry ,0210 nano-technology ,business - Abstract
We investigate aggregation-induced emission (AIE) characters of bulk tetraphenylethene (TPE) derivatives with nonpolar and polar exterior chains. The bulk TPE derivatives with nonpolar dodecyl and polar di(ethylene oxide) chains are in liquid crystal (LC) and crystalline phases, respectively, at room temperature. The mobile LC character of the TPE derivatives in bulk is crucial for high AIE efficiency because the mobile LC character is effective in minimizing the number of undesirable nonemissive local sites in aggregates and inducing a homogeneous zigzag-stacked columnar structure with j-type coupled transition dipoles of the TPE derivatives. The mobile LC characteristics of AIE luminogens can be advantageous for highly efficient solid-state emission.
- Published
- 2016
7. Roles of Sterol Derivatives in Regulating the Properties of Phospholipid Bilayer Systems
- Author
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Hiroshi Umakoshi, Tham Thi Bui, and Keishi Suga
- Subjects
0301 basic medicine ,medicine.medical_treatment ,02 engineering and technology ,Steroid ,03 medical and health sciences ,chemistry.chemical_compound ,polycyclic compounds ,Electrochemistry ,medicine ,General Materials Science ,Lipid bilayer ,Spectroscopy ,Ergosterol ,Liposome ,Lanosterol ,Biological membrane ,Surfaces and Interfaces ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Sterol ,030104 developmental biology ,Membrane ,chemistry ,Biochemistry ,lipids (amino acids, peptides, and proteins) ,0210 nano-technology - Abstract
Liposomes are considered an ideal biomimetic environment and are potential functional carriers for important molecules such as steroids and sterols. With respect to the regulation of self-assembly via sterol insertion, several pathways such as the sterol biosynthesis pathway are affected by the physicochemical properties of the membranes. However, the behavior of steroid or sterol molecules (except cholesterol (Chl)) in the self-assembled membranes has not been thoroughly investigated. In this study, to analyze the fundamental behavior of steroid molecules in fluid membranes, Chl, lanosterol, and ergosterol were used as representative sterols in order to clarify how they regulate the physicochemical properties of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) liposomes. Membrane properties such as surface membrane fluidity, hydrophobicity, surface membrane polarity, inner membrane polarity, and inner membrane fluidity were investigated using fluorescent probes, including 1-(4-trimethylammoniumphenyl)-6-phenyl-1,3,5-hexatriene, 8-anilino-1-naphthalenesulfonic acid, 6-propionyl-2-(dimethylamino) naphthalene, 6-dodecanoyl-2-dimethylaminonaphthalene, and 1,6-diphenyl-1,3,5-hexatriene. The results indicated that each sterol derivative could regulate the membrane properties in different ways. Specifically, Chl successfully increased the packing of the DOPC/Chl membrane proportional to its concentration, and lanosterol and ergosterol showed lower efficiencies in ordering the membrane in hydrophobic regions. Given the different binding positions of the probes in the membranes, the differences in membrane properties reflected the relationship between sterol derivatives and their locations in the membrane.
- Published
- 2016
8. Monitoring of Antibiotic Residues in Aquatic Products in Urban and Rural Areas of Vietnam
- Author
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Khanh Thi Van Dao, Khai Ngoc Pham, Takahiro Yamaguchi, Masahiro Okihashi, Mai Quang Vien, Khanh Tran Pham, Thang Nguyen, Phuc Do Nguyen, Keiji Kajimura, Kazumasa Hirata, Thinh Duc Nguyen, Ninh Hoang Le, Yuko Kumeda, Yoshimasa Yamamoto, Chien Trong Bui, Hue Thi Ngoc Nguyen, Hoa Thi Tran, Vien Van Chau, Kotaro Uchida, Long Thi Bui, Mai Hoang Ngoc Do, Yoshimasa Konishi, Kazuo Harada, Ha Viet Le, Chinh Van Dang, and Diep Thi Khong
- Subjects
Veterinary medicine ,medicine.drug_class ,Antibiotics ,Food Contamination ,Rural Health ,010501 environmental sciences ,Biology ,01 natural sciences ,Aquaculture ,Tandem Mass Spectrometry ,medicine ,Enrofloxacin ,Animals ,Shellfish ,0105 earth and related environmental sciences ,business.industry ,010401 analytical chemistry ,General Chemistry ,Contamination ,Trimethoprim ,Drug Residues ,Anti-Bacterial Agents ,0104 chemical sciences ,Shrimp ,Ciprofloxacin ,Vietnam ,Environmental chemistry ,Palaemonidae ,Rural area ,General Agricultural and Biological Sciences ,business ,Water Pollutants, Chemical ,medicine.drug - Abstract
Antibiotic residues in aquatic products in Vietnam were investigated. A total of 511 fish and shrimp samples were collected from markets in Ho Chi Minh City (HCMC), Thai Binh (TB), and Nha Trang (NT) from July 2013 to October 2015. The samples were extracted with 2% formic acid in acetonitrile and washed with dispersive C18 sorbent. Thirty-two antibiotics were analyzed by LC-MS/MS. Of the 362 samples from HCMC, antibiotic residues were found in 53 samples. Enrofloxacin was commonly detected, at a rate of 10.8%. In contrast, samples from TB and NT were less contaminated: only 1 of 118 analyzed samples showed residues in TB and only 1 of 31 showed residues in NT. These differences were attributed to the local manufacturing/distribution systems. To understand the current status of antibiotic use and prevent adverse effects that may be caused by their overuse, continual monitoring is required.
- Published
- 2016
9. Monitoring of Antibiotic Residues in Aquatic Products in Urban and Rural Areas of Vietnam
- Author
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Uchida, Kotaro, primary, Konishi, Yoshimasa, additional, Harada, Kazuo, additional, Okihashi, Masahiro, additional, Yamaguchi, Takahiro, additional, Do, Mai Hoang Ngoc, additional, Thi Bui, Long, additional, Duc Nguyen, Thinh, additional, Do Nguyen, Phuc, additional, Thi Khong, Diep, additional, Thi Tran, Hoa, additional, Nam Nguyen, Thang, additional, Viet Le, Ha, additional, Van Chau, Vien, additional, Thi Van Dao, Khanh, additional, Thi Ngoc Nguyen, Hue, additional, Kajimura, Keiji, additional, Kumeda, Yuko, additional, Tran Pham, Khanh, additional, Ngoc Pham, Khai, additional, Trong Bui, Chien, additional, Quang Vien, Mai, additional, Hoang Le, Ninh, additional, Van Dang, Chinh, additional, Hirata, Kazumasa, additional, and Yamamoto, Yoshimasa, additional
- Published
- 2016
- Full Text
- View/download PDF
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