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The Determinants of Environmental Information Disclosure in Vietnam Listed Companies
NGUYEN, Thi Le Hang,NGUYEN, Thi Thu Hien,NGUYEN, Thi Thanh Huyen,LE, Thi Hong Anh,NGUYEN, Van Cong Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.2
Environmental pollution and climate change in Vietnam are now becoming a major concern. This situation is increasing the pressure on the companies to improve their social responsibility in production and business activities and disclose the environmental information to meet the requirements of stakeholders. This study investigates the internal and external factors of the company that affects the environmental information disclosure of listed companies on the Vietnam stock market as business sector, firm size, corporate manager perceptions, profitability, financial leverage, community pressure, pressures from stakeholders, government pressure influencing environmental information disclosure. Analytical data collected through the survey of 120 listed companies on the Ho Chi Minh City Stock Exchange (HOSE). By testing Cronbach's Alpha, exploratory factor analysis (EFA) and logistic regression analysis, the results of the study show that the level of environmental information disclosure of listed companies on the stock market in Vietnam depends heavily on government regulations, followed by the pressure from stakeholders, community pressure, views of business managers, companies size, business sector, and particularly profitability and financial leverage factors that have a negative relationship with environmental information disclosure.
Synthesis and Characterization of Nitrogen-doped Activated Carbon by Using Melamine
Hien Ngoc Thi Le,정혜경 한국물리학회 2015 새물리 Vol.65 No.1
A simple method to synthesize nitrogen-doped activated carbon by using simple thermal treatment of a mixture of activated carbon and melamine was introduced. About 6 at% of nitrogen were successfully doped into the activated carbon, and it affected the electrochemical properties dramatically. The nitrogen-containing groups could be intercalated and diffused into the pores of the activated carbon and blocked them, resulting in decreased surface area and volume. However, the cyclic voltammetric current density was significantly increased in the nitrogen-doped activated carbon compared to the bare activated carbon, demonstrating the positive effect of nitrogen doping on the performance of supercapacitors and energy storage devices.
Chemical constituents of the Annona glabra fruit and their cytotoxic activity.
Hien, Nguyen Thi Thu,Nhiem, Nguyen Xuan,Yen, Duong Thi Hai,Hang, Dan Thi Thuy,Tai, Bui Huu,Quang, Tran Hong,Tuan Anh, Hoang Le,Kiem, Phan Van,Minh, Chau Van,Kim, Eun-Ji,Kim, Seung Hyun,Kang, Hee Kyoun Swets Zeitlinger 2015 PHARMACEUTICAL BIOLOGY Vol.53 No.11
<P>Traditional Chinese medicines have attracted increasing interest as potential sources of novel drugs with a wide range of biological and pharmacological activities. Annona glabra Linn (Annonaceae) is used in traditional medicine as an anticancer drug. Phytochemical investigation of this plant led to the isolation of acetogenins, ent-kauranes, peptides, and alkaloids. In addition, compounds exhibited anticancer, anti-HIV-reserve, and antimalaria.</P>
Electrochemical Properties of Silicon Dioxide Particles synthesized by Using Sol-gel Method
Hien Ngoc Thi Le,정혜경 한국물리학회 2013 새물리 Vol.63 No.2
A novel way to synthesize silicon-dioxide particles by using silicon tetrachloride and 2- methoxyethanol and a sol-gel method has been developed. Different sizes and densities of the silicon-dioxide (SiO2) particles were formed on Ni foils at different spin-coating speeds of 2000, 3000, and 4000 rpm for 20 seconds. Scanning electron microscopy results showed that SiO2 particles had been at all speeds and that the distribution of particles at 4000 rpm was the best. Cyclic voltammetry and electrochemical impedance spectroscopy were also used to characterize the electrochemical properties of the obtained samples for energy-storage-device applications
Effect of Environmental Factors on the Germination and Emergence of Erodium cicutarium
Thi Hien Le,Taehyun Oh,Aung Bo Bo,WeiQiang Jia,Kwang Min Cho,Kee Woong Park 한국잡초학회·한국잔디학회 2020 Weed & Turfgrass Science Vol.9 No.4
This study was conducted to investigate the distribution and seed biology of Erodium cicutarium in Chungnam province of Korea. E. cicutarium normally occurred in pastures, roadsides, and crop fields. During a whole year after harvest, E. cicutarium seed germination increased with increasing storage time. No germination was found until 60 days after harvest, and began to germinate 90 days after harvest and got reaching full germination 300 days after harvest. The optimum germination temperature was 20℃ and soaking in the sulfuric acid for 20 minutes was the most suitable method to break seed dormancy. Germination of E. cicutarium seeds was decreased by increasing NaCl concentrations. Up to 10 mM of NaCl did not affect E. cicutarium seed germination and less than 20% of seeds germinated at 160 mM of NaCl. Approximately, 78% of seeds emerged at 0.5-2 cm of sowing depth but the seeds did not emerge at a burial depth greater than 4 cm. These results will be useful to develop integrated exotic weed management in the E. cicutarium infested area in Korea.
Le, Hien Thi Ngoc,Jeong, Hae Kyung Pergamon Press 2017 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>The γ-cyclodextrin–graphite oxide–carbon nanotube (γCD–GO–CNT) composite has shown the best capability and sensitivity of supramolecular recognition compared to the other two CD-GO-CNT composites (αCD-GO-CNT and βCD-GO-CNT) in our previous study. The biggest CD (γCD) was very important in the formation of the supramolecular complex and made the detection of the biomolecules easier. In this report, significantly improved supramolecular recognition capability of γCD–GO–CNT is introduced by using thermally reduced GO (TRGO), instead of typical GO. New synthesized γCD–TRGO–CNT composite film shows lower electrochemical impedance, higher carbon to oxygen atomic ratio, and larger surface area compared to the γCD–GO–CNT composite film, resulting in higher sensitivity and capability in the supramolecular recognition. The sensitivity, defined as the slope of the maximum response current versus guest molecule concentration graph, increases significantly from 4.42 to 9.44 for dopamine and from 2.21 to 4.15 for ascorbic acid. The excellent enhancement of the supramolecular recognition of the γCD–TRGO–CNT composite is attributed to TRGO. It is, therefore, concluded that it is very important to load γCD in the composite as well as to decrease the electrochemical impedance for effective electrochemical biosensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The γ-cyclodextrin- thermally reduced graphite oxide-carbon nanotube composite film was successfully synthesized. </LI> <LI> The γCD-TRGO-CNT composite shows enhanced supramolecular recognition capability compared to the γCD-GO-CNT composite. </LI> <LI> Sensitivity of the γCD-TRGO-CNT composite dramatically increased by a factor of two compared to the γCD-GO-CNT composite. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
PTP Inhibitor XIX Inhibits DUSP22 by Conformational Change
Hien Thi Thu Le,조영창,이세웅,김양균,김권섭,박성구,박병철,조사연 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.2
Protein tyrosine phosphatases (PTPs) play critical roles in signal transduction by dephosphorylating regulatory proteins involved in many signaling cascades. PTP inhibitors have been reported as potential drugs to treat diseases induced by PTP activity. In this study, we show that PTP inhibitor XIX (PI-19) inhibits dual-specificity phosphatase 22 (DUSP22). Kinetic analysis of PI-19 and DUSP22 suggests that PI-19 inhibits DUSP22 at the catalytic site. In addition, we performed drug affinity responsive targets stability (DARTS) analysis to reveal that the conformation of DUSP22 changed upon binding to PI-19. Moreover, PI-19 blocked DUSP22-mediated dephosphorylation of the signal transducer and activator of transcription 3 (STAT3) at Tyr-705, a critical site for STAT3 activity. Collectively, our results imply that PI-19 is an effective inhibitor of DUSP22 that regulates STAT3 activity.