Search results for: Trang T. Nguyen

Items from 1 to 20 out of 24 results

article

Efficient synthesis of 4‐phenacylideneflavenes using recyclable gelified Brønsted acidic ionic liquid under solvent‐free and column chromatography‐free conditions: a green method and mechanistic insight

Xuan‐Trang T Nguyen, The T Nguyen, Long H Nguyen, Hai T Nguyen, more

Journal of Chemical Technology & Biotechnology > 97 > 3 > 653 - 661

BACKGROUND Synthetic routes involving recyclable catalysts, solvent‐free conditions and chromatography‐free purification are becoming more popular as favorable substitutes for conventional ones. We report here the exciting possibility of producing selective functionalization of 4‐phenacylideneflavenes using an efficient gelified Brønsted acidic ionic liquid (BAIL) as a recyclable catalyst from available...

article

Voluntary social insurance for Vietnamese laborers in the informal economic sector

Linh Mai, Hoa T. K. Nguyen, Nga T. T. Nguyen, Trang T. Nguyen

Asian Social Work and Policy Review > 15 > 1 > 4 - 14

Voluntary social insurance (VSI), a type of social insurance organized by the Government, allows participants, who work in the informal sector with unstable jobs and income, to choose the premium and payment methods in accordance with their income for their retirement plan. The rate of Vietnamese laborers participating in VSI is low. This study aims to examine the current situation of VSI participation...

article

Molecular Dynamics Simulations of Structural and Mechanical Properties in MgSiO₃ Glass

Thao T. Nguyen, Trang T. Nguyen, Hinh T. Dinh, Vinh V. Le

physica status solidi (b) > 256 > 11 > n/a - n/a

Molecular dynamics simulations of MgSiO₃ glass have been carried out to study the structural and mechanical properties under uniaxial tension. The network structure consists of SiO_x and MgO_y units which link to others by corner‐, edge‐, and face‐sharing bonds. The Si‐rich and Mg‐rich regions exist in MgSiO₃ glass. The stress–strain curves exhibit the elastic and plastic characteristics at the various...

article

Race and life expectancy in the USA in the Great Depression

Tim A. Bruckner, Ashley M. Ima, Trang T. Nguyen, Andrew Noymer

Genus > 2019 > 75 > 1 > 1-22

Prior work has highlighted increases in life expectancy in the USA during the Great Depression. This contradicts the tenet that life expectancy is positively correlated with human welfare, but it coheres with recent literature on mortality and recessions. We construct Lee-Carter interval estimates of life expectancy during the Great Depression, based on trends before 1929. In this analysis, all-race...

article

Post-sunset rise of equatorial F layer—or upwelling growth?

Roland T. Tsunoda, Susumu Saito, Trang T. Nguyen

Progress in Earth and Planetary Science > 2018 > 5 > 1 > 1-28

According to the so-called upwelling paradigm, development of equatorial plasma bubbles (EPBs) involves (1) appearance of an upwelling (i.e., local uplift with a zonal width of ~ 400 km) in the bottomside of the equatorial F layer, (2) its growth via the F-region interchange instability during the post-sunset rise (PSSR) of the F layer, and (3) launching of EPBs, which starts near the end of PSSR,...

article

On the interaction between fluoxetine and lipid membranes: Effect of the lipid composition

Vy T. Pham, Trinh Q. Nguyen, Uyen P.N. Dao, Trang T. Nguyen

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2018 > 191 > C > 50-61

Molecular interaction between the antidepressant fluoxetine and lipid bilayers was investigated in order to provide insights into the drug's incorporation to lipid membranes. In particular, the effects of lipid's unsaturation degree and cholesterol content on the partitioning of fluoxetine into large unilamellar vesicles (LUVs) comprised of unsaturated 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC)...

article

Effect of electrostatic interaction between fluoxetine and lipid membranes on the partitioning of fluoxetine investigated using second derivative spectrophotometry and FTIR

Tien T.T. Do, Uyen P.N. Dao, Huong T. Bui, Trang T. Nguyen

Chemistry and Physics of Lipids > 2017 > 207 > PA > 10-23

The interaction between a drug molecule and lipid bilayers is highly important regarding the pharmaceutical activity of the drug. In this study, the interaction of fluoxetine, a well-known selective serotonin reuptake inhibitor antidepressant and lipid bilayers composed of 1,2-dipalmitoyl-sn-glycero-3-phospho-(1′-rac-glycerol) (DPPG) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) was studied...

article

Levodopa (L-DOPA) attenuates endoplasmic reticulum stress response and cell death signaling through DRD2 in SH-SY5Y neuronal cells under α-synuclein-induced toxicity

Juhyun Song, Byeong C. Kim, Dai-Trang T. Nguyen, Manikandan Samidurai, more

Neuroscience > 2017 > 358 > C > 336-348

Parkinson’s disease (PD) is characterized by the formation of Lewy bodies (LBs) in dopaminergic neurons. α-Synuclein (α-syn), a major protein component of LBs, is known to regulate synaptic plasticity, with a crucial role in memory and motor function in the central nervous system. Levodopa (L-3,4-dihydroxyphenylalanine; also known as L-DOPA) is considered the most effective medication for controlling...

article

Deriving convex hulls through lifting and projection

Trang T. Nguyen, Jean-Philippe P. Richard, Mohit Tawarmalani

Mathematical Programming > 2018 > 169 > 2 > 377-415

We consider convex hull descriptions for certain sets described by inequality constraints over a hypercube and propose a lifting-and-projection technique to construct them. The general procedure obtains the convex hulls as an intersection of semi-infinite families of linear inequalities, each derived using lifting techniques that are interpreted using convexification tools. We demonstrate that differentiability...

article

Errors in the Administration Technique of Insulin Pen Devices: A Result of Insufficient Education

Teresa H. Truong, Trang T. Nguyen, Becky L. Armor, Jamie R. Farley

Diabetes Therapy > 2017 > 8 > 2 > 221-226

Insulin is a high-alert medication in both inpatient and outpatient settings. Insulin can cause significant harm when administered in error. Despite advancements in insulin pen technology, errors in the administration technique remain an issue. Although various factors can contribute to administration errors, lack of education on how to operate these devices is one of the most common reasons they...

article

Rhodium‐Catalyzed Asymmetric Synthesis of β‐Branched Amides

Zhao Wu, Joshua D. Laffoon, Trang T. Nguyen, Jacob D. McAlpin, more

Angewandte Chemie International Edition > 56 > 5 > 1371 - 1375

A general asymmetric route for the one‐step synthesis of chiral β‐branched amides is reported through the highly enantioselective isomerization of allylamines, followed by enamine exchange, and subsequent oxidation. The enamine exchange allows for a rapid and modular synthesis of various amides, including challenging β‐diaryl and β‐cyclic.

article

Rhodium‐Catalyzed Asymmetric Synthesis of β‐Branched Amides

Zhao Wu, Joshua D. Laffoon, Trang T. Nguyen, Jacob D. McAlpin, more

Angewandte Chemie > 129 > 5 > 1391 - 1395

article

Molecular dynamics simulations of pressure-induced structural and mechanical property changes in amorphous Al2O3

Giang T. Nguyen, Thao T. Nguyen, Trang T. Nguyen, Vinh V. Le

Journal of Non-Crystalline Solids > 2016 > 449 > C > 100-106

Molecular dynamics (MD) simulations of amorphous alumina have been carried out to investigate the pressure-induced structural transformation and mechanical properties. We found that not only the fraction of units AlO_x (x=4, 5, 6) but also the density of each AlO_x type change upon compression. The density of sample can be expressed through the fraction and partial density of units AlO_x. With increasing...

article

Effect of the Si content on structure and mechanical properties in Al1-xSixN materials

Trang T. Nguyen, Thao T. Nguyen, Giang T. Nguyen, Vinh V. Le

Vacuum > 2016 > 129 > C > 1-8

Molecular dynamics simulations of Al_1-xSi_xN samples with different Si content were carried out to investigate their structures, void distributions and mechanical properties. Such effects on other microscopic characteristics, such as bond-length distance, bond-angle and coordination number distribution have been observed. Based on the common neighbor analysis, we found that Si₃N₄ sample has amorphous...

chapter

Convexification Techniques for Linear Complementarity Constraints

Trang T. Nguyen, Mohit Tawarmalani, Jean-Philippe P. Richard

Lecture Notes in Computer Science > Integer Programming and Combinatoral Optimization > 336-348

We develop convexification techniques for linear programs with linear complementarity constraints (LPCC). In particular, we generalize the reformulation-linearization technique of [9] to complementarity problems and discuss how it reduces to the standard technique for binary mixed-integer programs. Then, we consider a class of complementarity problems that appear in KKT systems and show that its convex...

article

exo-Brevicomin biosynthetic pathway enzymes from the Mountain Pine Beetle, Dendroctonus ponderosae

Minmin Song, Patrick Delaplain, Trang T. Nguyen, Xibei Liu, more

Insect Biochemistry and Molecular Biology > 2014 > 53 > Complete > 73-80

exoBrevicomin (exo-7-ethyl-5-methyl-6,8-dioxabicyclo[3.2.1]octane) is an important semiochemical for a number of beetle species, including the highly destructive Mountain Pine Beetle (Dendroctonus ponderosae). It is also found in other insects and the African elephant. Despite its significance, very little is known about its biosynthesis. A recent microarray analysis implicated a small cluster of...

article

Diversity and abundance of phyllosphere bacteria are linked to insect herbivory

Parris T. Humphrey, Trang T. Nguyen, Martha M. Villalobos, Noah K. Whiteman

Molecular Ecology > 23 > 6 > 1497 - 1515

Simultaneous or sequential attack by herbivores and microbes is common in plants. Many seed plants exhibit a defence trade‐off against chewing herbivorous insects and leaf‐colonizing (‘phyllosphere’) bacteria, which arises from cross‐talk between the phytohormones jasmonic acid (JA, induced by many herbivores) and salicylic acid (SA, induced by many bacteria). This cross‐talk may promote reciprocal...

article

exo-Brevicomin Biosynthesis in the Fat Body of the Mountain Pine Beetle, Dendroctonus ponderosae

Minmin Song, Andrew Gorzalski, Trang T. Nguyen, Xibei Liu, more

Journal of Chemical Ecology > 2014 > 40 > 2 > 181-189

exo-Brevicomin (exo-7-ethyl-5-methyl-6,8-dioxabicyclo[3.2.1]octane) is an important semiochemical for a number of beetle species, including the highly destructive mountain pine beetle, Dendroctonus ponderosae. It also has been found in other insects and even in the African elephant. Despite its significance, little is known about its biosynthesis. In order to fill this gap and to identify new molecular...

article

Prevalence, Risk Factors, and Disease Knowledge of Chronic Hepatitis B Infection in Vietnamese Americans in California

Nghi B. Ha, Huy N. Trinh, Trang T. Nguyen, Truong-Sinh Leduc, more

Journal of Cancer Education > 2013 > 28 > 2 > 319-324

Our goal is to examine the prevalence, risk factors, and disease knowledge of chronic hepatitis B (CHB) among Vietnamese Americans in California. We also examined treatment eligibility and linkage to care among patients who tested positive for CHB. We enrolled 717 subjects from ten different hepatitis B virus (HBV) screening events in five locations from January 2009 to June 2010 in California. HBV...

article

High-Throughput Screening of Drug–Lipid Membrane Interactions via Counter-Propagating Second Harmonic Generation Imaging

Trang T. Nguyen, John C. Conboy

Analytical Chemistry > 2011 > 83 > 15 > 5979 - 5988

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INFONA - science communication portal

Search results for: Trang T. Nguyen

Efficient synthesis of 4‐phenacylideneflavenes using recyclable gelified Brønsted acidic ionic liquid under solvent‐free and column chromatography‐free conditions: a green method and mechanistic insight

Voluntary social insurance for Vietnamese laborers in the informal economic sector

Molecular Dynamics Simulations of Structural and Mechanical Properties in MgSiO₃ Glass

Race and life expectancy in the USA in the Great Depression

Post-sunset rise of equatorial F layer—or upwelling growth?

On the interaction between fluoxetine and lipid membranes: Effect of the lipid composition

Effect of electrostatic interaction between fluoxetine and lipid membranes on the partitioning of fluoxetine investigated using second derivative spectrophotometry and FTIR

Levodopa (L-DOPA) attenuates endoplasmic reticulum stress response and cell death signaling through DRD2 in SH-SY5Y neuronal cells under α-synuclein-induced toxicity

Deriving convex hulls through lifting and projection

Errors in the Administration Technique of Insulin Pen Devices: A Result of Insufficient Education

Rhodium‐Catalyzed Asymmetric Synthesis of β‐Branched Amides

Rhodium‐Catalyzed Asymmetric Synthesis of β‐Branched Amides

Molecular dynamics simulations of pressure-induced structural and mechanical property changes in amorphous Al2O3

Effect of the Si content on structure and mechanical properties in Al1-xSixN materials

Convexification Techniques for Linear Complementarity Constraints

exo-Brevicomin biosynthetic pathway enzymes from the Mountain Pine Beetle, Dendroctonus ponderosae

Diversity and abundance of phyllosphere bacteria are linked to insect herbivory

exo-Brevicomin Biosynthesis in the Fat Body of the Mountain Pine Beetle, Dendroctonus ponderosae

Prevalence, Risk Factors, and Disease Knowledge of Chronic Hepatitis B Infection in Vietnamese Americans in California

High-Throughput Screening of Drug–Lipid Membrane Interactions via Counter-Propagating Second Harmonic Generation Imaging

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