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  • 1
    Online Resource
    Online Resource
    Two new compounds from leaves of Bruguiera cylindrica (L.) Blume with the in vitro α-glucosidase inhibitory activity
    Viet Nam National University Ho Chi Minh City ; 2021
    In:  Science and Technology Development Journal Vol. 23, No. 4 ( 2021-01-12)
    Details
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 23, No. 4 ( 2021-01-12)
    Abstract: Introduction: Bruguiera cylindrica is one of the mangrove plants belonging to Bruguiera genus. This genus is characterized by the presence of a large number of compounds, but the research on bioactivities has not been investigated so far. In the present research, the α-glucosidase inhibitory activity, as well as chemical constituents of the ethyl acetate extract of this plant, were studied. Methods: The chemical structures of two new compounds were elucidated by spectroscopic and computational methods. Results: Two new compounds, benzobrugierol (1) and bruguierine (2), were isolated from leaves of Bruguiera cylindrica (L.) Blume, together with nine known ones, including lupeol (3), betulin (4), chrysoeriol (5), glut-5-ene-3-ol (6), cholesta-4-ene-3-one (7), 3α-(Z)-coumaroyllupeol (8), 3α-(E)-coumaroyllupeol (9), 3β-hydroxycholesta-5-ene-7-one (10) and β-sitosterol 3-O-β-D-glucopyranoside (11). Extracts and some isolated compounds were evaluated for α-glucosidase inhibitory activities. Conclusion: The results showed that most of the extracts and tested compounds exhibited activities better than the positive control acarbose, especially two new compounds 1 and 2 with their IC50 values of 17.9 ± 0.4 and 34.6 ± 0.7 (mg/mL), respectively.
    Type of Medium: Online Resource
    ISSN: 1859-0128
    URL: Article
    DOI: 10.32508/stdj.v23i4.2457
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2021
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  • 2
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    Online Resource
    Develop a clean air action plan based on scientific data: a case of Ho Chi Minh city
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal - Natural Sciences Vol. 4, No. 1 ( 2020-12-20), p. first-
    Details
    In: Science and Technology Development Journal - Natural Sciences, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 1 ( 2020-12-20), p. first-
    Abstract: Ho Chi Minh City (HCMC) has quickly become a modernized and industrialized city undergoing a rapid population growth affecting on the local environment, especially the air quality and human health. It's urgent need to have a Clean Air Action Plan (CAP) for HCMC. The aim of this research is to develop a clean air plan for HCMC based on scientific basis by integrating results of emissions inventory, air emssion loading capacties and results of the impact of air pollution on people's health. This research applied the Clean Air For Smaller City in ASEAN Region project (CASC) method of Germany to develop the CAP. Emission inventory resulted from the integration of two approaches of bottom-up and top-down. The results of simulation of air pollution dispersion and air emission loading capacities were from the TAPM-CTM model system. Method of calculating the impact of air pollution on the health of people in Ho Chi Minh City was based on BENMAP model theory. The results showed that the source of traffic accounts for the largest emissions of all pollutants, contributed respectively, 99%, 97%, 93%, 78%, 23%, 64% and 45% of total CO, NMVOC emissions, NOx, SO2, TSP, CH4, and PM2:5 of the whole HCMC. For some central areas, the city was no longer able to receive more emissions of CO and NOx. Assessing the impact of air pollution on health showed that the great impact of PM2:5 on public health accounted for 81.45% of the total deaths caused by all three pollutants ( PM2:5, SO2, NO2). Finally, a CAP was suggested with 13 proposals and 1 recommendation for reducing air pollution in HCMC for the period of 2020–2025. This is the first comprehensive study on CAP in Vietnam. This result supports government authorities to promulgate plans and actions to reduce emissions protecting human health and the environment for a sustainable development.
    Type of Medium: Online Resource
    ISSN: 2588-106X , 2588-106X
    URL: Article
    DOI: 10.32508/stdjns.v4i1.991
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 3
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    Online Resource
    Preparation of activated red mud and its application for removal of hydrogen sulfide in air
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science & Technology Development Journal - Engineering and Technology Vol. 3, No. 2 ( 2020-07-03), p. First-
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, Vol. 3, No. 2 ( 2020-07-03), p. First-
    Abstract: Red mud is a highly alkaline solid waste from the Bayer process for aluminum production. Red mud reservoirs are usually considered as a potential environmental risk. The treatment of red mud is costly due to the lack of an effective and economical treatment technology. On the other hand, the main components of red mud are Fe2O3, Al2O3, SiO2, and Na2O, which could be employed as a promising precursor for the preparation of various nanomaterials. In this study, we prepared activated red mud by thermal and acid treatment method and applied it for adsorption of H2S in air. The red mud was activated under different temperatures (i.e., 200, 400, 600, and 800 oC for 4 h), types of acid (i.e., H2SO4 and HCl), and acid concentrations (i.e., 0.5, 1.5, and 2.5 M). The produced materials were then applied for H2S removal in air with concentration of 90 – 110 mg/m3 using a fix-bed adsorption column test. Results showed that red mud activated at 800 oC and with 1.5 M H2SO4 solution had the highest adsorption capacity of 29.38 mg/g with an average removal efficiency of 80.2%. The effects of gas flow rate and initial H2S concentration were also investigated, and the highest removal capacity was achieved at an inlet concentration of 100 mg/m3 and flow rate of 1 L/min. Both Langmuir and Freundlich adsorption isotherms were employed for modelling the H2S adsorption by this material and the experimental result was more fitted with the Langmuir isotherm. The thermal desorption and recyclability test were also conducted for evaluating the practical application of activated red mud material and 200 oC was the suggested desorption temperature with 81.7% adsorption capacity recovery.
    Type of Medium: Online Resource
    ISSN: 2615-9872 , 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v3i2.474
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 4
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    Online Resource
    Study of Curcumin Adsorption of Nano Fe-based Metal-Organic Framework
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal - Natural Sciences Vol. 4, No. 4 ( 2020-11-13), p. First-
    Details
    In: Science and Technology Development Journal - Natural Sciences, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 4 ( 2020-11-13), p. First-
    Abstract: Highly porous and biocompatible nano metal-organic framework materials (NMOF) are increasingly being applied in biomedical fields, especially as pharmaceutical adsorbent materials. Curcumin, found in turmeric, is a widely common herb in Eastern which has recently used in many applications in supporting cancer treatment. In the synthesis of MOF materials, the use of surfactants allows to control the morphology, the process of crystal formation and development and particle size of the material. In this research, MIL-100 (Fe) nanomaterials were successfully synthesized at room temperature in the presence of polyvinylpyrrolidone surfactant (PVP) to control the nanoparticle size about 50 nm in size. The synthesized MOF structure and properties were analyzed by using characterization techniques, including powder X-ray diffraction (PXRD), fourier-transform infrared (FT-IR), thermal gravimetric analyses (TGA) and nitrogen isothermal adsorption-desorption at 77 K. The characterization results showed that MIL-100 (Fe) nanomaterials have high crystallinity, large surface area, and highly thermal stability. However, its particle size is very small, only about 50 nm. Curcumin adsorption studies exhibited that this material had the ability to adsorb curcumin with an adsorption capacity up to 64.36 mg g-1. Kinetic and mechanism studies revealed that curcumin adsorption followed the pseudo-second model. In addition, thermodynamic studies proved that this was a spontaneous and exothermic adsorption process.
    Type of Medium: Online Resource
    ISSN: 2588-106X , 2588-106X
    URL: Article
    DOI: 10.32508/stdjns.v4i4.927
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 5
    Online Resource
    Online Resource
    Assessment of the livelihood sustainability of rice farmers in the upper floodplains of the Vietnamese Mekong delta
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal - Natural Sciences Vol. 4, No. 1 ( 2020-12-20), p. first-
    Details
    In: Science and Technology Development Journal - Natural Sciences, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 1 ( 2020-12-20), p. first-
    Abstract: Rural areas and rural livelihoods in many countries have been affected by changes in natural and environmental conditions. In areas where livelihoods relied on the floodwater, changes in flood regimes and the natural environment had significantly impacted many farmers' livelihoods. In the Mekong Delta flooded areas, flood patterns changed mainly due to the hydropower development and the climate change. The livelihoods of many farmers, primarily rice farmers, were facing challenges and needed changes to adapt to the sustainable livelihood development. This study used a sustainable livelihood framework of DFID to assess factors affecting the sustainability in agricultural livelihoods in flooded areas of An Giang province, specifically at Phu Hiep and Phu Long communes of Phu Tan district. We interviewed 60 farmers based on the structured questionnaire and conducted two focus group discussions with more than 40 participating farmers. Our results of the Livelihood Capitals Index (LCI) showed that natural and physical capitals had less impact on household livelihoods. Phu Long is less affected than Phu Hiep by assessing five capitals. Farm households' current livelihoods were mainly affected by the lack of human resources and the unstability of market prices. The rate of consensus on transition to sustainable farming models was not high due to many factors. However, the transition is possible if their production and output are secured by the government.
    Type of Medium: Online Resource
    ISSN: 2588-106X , 2588-106X
    URL: Article
    DOI: 10.32508/stdjns.v4i1.992
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 6
    Online Resource
    Online Resource
    Heterologous expression of human KGF/FGF7 (Keratinocyte growth factor) in Pichia pastoris
    Viet Nam National University Ho Chi Minh City ; 2020
    In:  Science and Technology Development Journal - Natural Sciences Vol. 4, No. 3 ( 2020-07-01), p. First-
    Details
    In: Science and Technology Development Journal - Natural Sciences, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 3 ( 2020-07-01), p. First-
    Abstract: Keratinocyte Growth Factor (KGF) is a paracrine-acting and epithelium-specific growth factor produced by cells of mesenchymal origin, play an important role in promoting proliferation, differentiation, motility of epithelial cells and stimulating regeneration of damaged epithelial tissues. Recent studies indicated that recombinant KGF is produced in many different expression systems such as bacteria, insect cells, plant and mammalian cells. However, KGF’s yields obtained from these systems is low and production’s cost is high especially in mammalian cells. In this study, the yeast Pichia pastoris was chosen as a host for KGF expression through induction of methanol by promoter AOX on pPICzαA vector system. The results demonstrated that the Pichia pastoris X33:kgf  transformants secreted KGF directly into BMMY medium after inducing by 0.5% methanol. The recombinant protein was purified by heparin affinity chromatography with the yield of 1.35 mg/l and the purity of 99.89% showed by SDS-PAGE. In addition, MTT assay showed the purified recombinant KGF had a proliferation effect on A549 cell line since A549 known as a cell has KGF’s receptor.
    Type of Medium: Online Resource
    ISSN: 2588-106X , 2588-106X
    URL: Article
    DOI: 10.32508/stdjns.v4i3.900
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2020
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  • 7
    Online Resource
    Online Resource
    Acclimation performance of constructed wetland coupled with microbial fuel cell for ammonia treatment of wastewaters at high loading rate
    Viet Nam National University Ho Chi Minh City ; 2021
    In:  Science & Technology Development Journal - Engineering and Technology ( 2021)
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, ( 2021)
    Abstract: Global challenges on water and energy crisis have pressurized on water treatment industry to put into practice advanced technologies for ensuring a suitable supply of either water or energy services. Compared with other biological treatment technologies, constructed wetland (CW) is widely considered as an efficient eco-technology for wastewater treatment with the advantages of low cost, simple operation and maintenance. Microbial fuel cell (MFC) technology is the recently emerging approach in environmental engineering. The integration of MFCs within vertical up-flow CW systems (VSF-CW) as a sustainable technology, therefore, could provide dual benefits in nitrogen removal of wastewaters and energy recovery simultaneously. This study has preliminarily evaluated the acclimation performance of VSF-CW-MFC systems at the high loading rate (4.2 mg COD/h.L; COD:N = 10:1) of domestic wastewaters containing ammonia. Results demonstrated the potential of VSF-CW-MFC systems in achieving electricity generation and ammonia removal of domestic wastewaters at the high loading rate. The plant presence and influent pH of 7.0 could improve the performance efficiency. Average removal efficiencies of NH4+ and COD in planted microcosms with the influent pH of 7.0 were 43.4% and 79%, respectively.
    Type of Medium: Online Resource
    ISSN: 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v4iSI1.909
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2021
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  • 8
    Online Resource
    Online Resource
    The impact of perceived value factors on customers's trust and loyalty for internet banking service
    Viet Nam National University Ho Chi Minh City ; 2022
    In:  Science & Technology Development Journal - Economics - Law and Management ( 2022)
    Details
    In: Science & Technology Development Journal - Economics - Law and Management, Viet Nam National University Ho Chi Minh City, ( 2022)
    Abstract: This study identifies factors that affect the perceived value of users of Internet Banking services and the degree of influence of factors in the research theory model on trust and loyalty in the period from 2019 to 2020. The model is tested with 420 random customers who live in Ho Chi Minh City continuously for 6 months or more, have at least one bank account and make at least one monthly transaction through online banking. During the conduct of the research, which occurred simultaneously with the fourth outbreak of the Covid-19 epidemic in Vietnam, most of the livelihoods of many households were severely affected by the production shutdown, the reduction of working hours as well as the diversion to online working from home. During that time, in order to promote the maintenance of transactions, the government encouraged non-cash payment. This factor has made the online banking industry a potential market for development and competition among service providers. This research paper aims to support the bank's administrators in designing policies and developing online banking products and services in accordance with the actual needs of customers. The results of the study showed that the factors of performance value, convenience value, monetary value, emotional value and brand integration value together have a positive impact on the perceived value of customers of Internet Banking services. In addition, perceived value and trust have a positive impact on the loyalty of customers using online banking services. In particular, perceived value has a much more positive impact.
    Type of Medium: Online Resource
    ISSN: 2588-1051
    URL: Article
    DOI: 10.32508/stdjelm.v6i4.1124
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2022
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