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  • 1
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2019
    In:  Science and Technology Development Journal - Natural Sciences Vol. 2, No. 2 ( 2019-05-18), p. 95-101
    In: Science and Technology Development Journal - Natural Sciences, Viet Nam National University Ho Chi Minh City, Vol. 2, No. 2 ( 2019-05-18), p. 95-101
    Abstract: We report a hydrothermal synthesis of a hybrid structure between gold nanoparticles and a metal organic framework, ZIF-8 (abbreviated as Au@ZIF-8). Au nanoparticles encapsulated in polyvinylpyrrolidone (PVP) was employed as seeds to grow the framework of ZIF-8. We controlled the position and concentrations of Au nanoparticles on ZIF-8 crystal by adjusting the volume of Au nanoparticles dissolved in DI water during the growth of ZIF-8. Morphology, structure, distribution of the hybrid structure were investigated by transmission microscope, powder xray diffraction, and diffuse reflectance UV-Vis spectroscopy. We tested out catalytic properties of Au@ZIF-8 through the reaction of 2-nitrophenol and NaBH4.
    Type of Medium: Online Resource
    ISSN: 2588-106X , 2588-106X
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2019
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  • 2
    In: Pediatrics, American Academy of Pediatrics (AAP), Vol. 134, No. 2 ( 2014-08-01), p. e519-e526
    Abstract: Outbreaks of rubella and congenital rubella syndrome (CRS) continue to arise in various countries where a rubella-containing vaccine is not included in the national immunization program. After a large-scale rubella outbreak in 2011, CRS cases emerged in Vietnam. The aim of this study was to clarify the clinical features of these cases with an emphasis on cardiovascular complications and outcomes. METHODS: From October 2011 to September 2012, we conducted a prospective surveillance study of infants & lt;12 months of age who had manifestations suggesting CRS at the only referral hospital in Khanh Hoa Province. These infants underwent standard examinations, echocardiography, cranial ultrasonography, automated auditory brainstem responses, blood cell count measurements, and rubella-specific antibody testing. Detected cardiovascular defects were regularly followed with echocardiography. RESULTS: We enrolled 38 cases of CRS characterized by a low birth weight (71%), cardiovascular defects (72%), cataracts (13%), hearing impairment (93%), purpura (84%), hepatosplenomegaly (68%), and thrombocytopenia (76%). Patent ductus arteriosus, the most common cardiovascular complication, was often associated with progressive pulmonary hypertension (PH). As of January 2013, 13 infants (34%) had died, and PH was significantly more frequent among the fatalities (P = .004); however, therapeutic closure of the ductus reversed the PH in several cases. CONCLUSIONS: PH-associated mortality is high among infants who have CRS in Vietnam. Providing proper assessments, continuous follow-up, and timely intervention for cardiovascular defects is critical for the management of CRS patients. Echocardiography is of diagnostic and prognostic value and can support better clinical management of CRS, even in a developing country setting.
    Type of Medium: Online Resource
    ISSN: 0031-4005 , 1098-4275
    Language: English
    Publisher: American Academy of Pediatrics (AAP)
    Publication Date: 2014
    detail.hit.zdb_id: 1477004-0
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  • 3
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2021
    In:  Science & Technology Development Journal - Engineering and Technology Vol. 4, No. 2 ( 2021-04-10), p. first-
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, Vol. 4, No. 2 ( 2021-04-10), p. first-
    Abstract: Several metals in soil affect the production of secondary metabolites in medicinal plants. In this study, we have determined concentrations of K, Mn, Fe, Zn, Cu in soils collected at Tinh Bien, Tri Ton, Thoai Son, and Cam Mountain areas in An Giang province by X-Ray Fluorescence Spectroscopy (XRF). We simultaneously evaluated the total phenolic and flavonoid content of methanol extracts from Solanum torvum (Sw.) leaves and Zingiber zerumbet (L.) rhizomes harvested in Tinh Bien and Cam Mountain. The results showed that the concentrations of metals reached the highest values at the soil particle size 0.25 mm among three sizes: 0.25 mm, 1 mm, and 2 mm. Whereas, the metal contents at two sampling depths 0-15 cm and 15-30 cm were similar. The concentrations of K and Cu in the soil in Tinh Bien are higher than Cam Mountain at 1.18 times and 1.70 times; however, the Fe, Zn, Mn content in Tinh Bien is lower at 2.16 times, 1.64 times, and 1.43 times. Thereby, it can be seen that the higher concentration of K and Cu may contribute to increasing the total phenolic content about 1.8 times with the Zingiber zerumbet (L.) rhizomes sample, and the flavonoid content by 2.5 times for the Solanum torvum (Sw.) leaves sample in Tinh Bien compared to Cam Mountain. Meanwhile, the concentrations of Fe, Zn, and Mn did not affect the flavonoid and phenolic content in these two plants
    Type of Medium: Online Resource
    ISSN: 2615-9872 , 2615-9872
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2021
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  • 4
    In: Biomass Conversion and Biorefinery, Springer Science and Business Media LLC, Vol. 13, No. 12 ( 2023-08), p. 10595-10603
    Type of Medium: Online Resource
    ISSN: 2190-6815 , 2190-6823
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2592298-1
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  • 5
    Online Resource
    Online Resource
    Macrothink Institute, Inc. ; 2020
    In:  Environmental Management and Sustainable Development Vol. 9, No. 4 ( 2020-09-28), p. 1-
    In: Environmental Management and Sustainable Development, Macrothink Institute, Inc., Vol. 9, No. 4 ( 2020-09-28), p. 1-
    Abstract: Sai Gon river is one most the most important river of South-eastern region of Vietnam by providing water resources and others vital natural services for millions of people in this area. In recent years, proportion with the sharply increasing of human activities in industry and agriculture, the river is continuously loaded with xenobiotics released by anthropogenic activities. Among pollutants, heavy metals are considered as the most toxic elements to aquatic living organisms and human health. The aim of this study is to assess the sensibility of freshwater microalgae Scenedesmus and water flea Daphnia carinata, two fresh water species from Vietnam to copper (Cu). After physical and chemical characterization, field water samples from upstream Sai Gon River was used as dilution water in toxicity tests. With water flea D. carinata, the EC50 value of 48h immobilization experiment was 1.90 µg/L. Growth inhibition of the Scenedesmus algae cells was determined following exposure for 72 h, and EC50 values was 78.2 µg/L. The results showed that Cu is highly toxic to both species, and water flea D. carinata was more sensitive than freshwater algae Scenedesmus. Based on the observed high sensitivity with Cu, both D. carinata and algae Scenedesmus are potential tools for the assessment of copper pollution in fresh water of Sai Gon river.
    Type of Medium: Online Resource
    ISSN: 2164-7682
    URL: Issue
    Language: Unknown
    Publisher: Macrothink Institute, Inc.
    Publication Date: 2020
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  • 6
    In: Environmental Science and Pollution Research, Springer Science and Business Media LLC, Vol. 29, No. 58 ( 2022-12), p. 87268-87280
    Type of Medium: Online Resource
    ISSN: 0944-1344 , 1614-7499
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2014192-0
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  • 7
    Online Resource
    Online Resource
    Bentham Science Publishers Ltd. ; 2022
    In:  The Open Transportation Journal Vol. 16, No. 1 ( 2022-09-28)
    In: The Open Transportation Journal, Bentham Science Publishers Ltd., Vol. 16, No. 1 ( 2022-09-28)
    Abstract: Climate change and global warming are severely impacting countries worldwide. Governments are being urged to promote Battery Electric Vehicles (BEVs) as an alternative to conventional vehicles, which are one of the main sources of emissions and pollution. Despite their environmental benefits, BEV adoption remains at a low level. Therefore, identifying the determinants of BEV adoption is necessary to promote greener transportation. Objective: This study aims at identifying and synthesizing factors affecting BEV adoption intention and actual behavior. A comparison and analysis will be made to draw meaningful results and suggest future research areas. Methods: A systematic literature review was conducted. Data were collected from research articles in peer-reviewed journals of well-known publishers. After a strict qualification process, 45 studies were selected and their findings are critically discussed. Results: Most studies are quantitative in nature and conducted in BEV developed markets. Various determinants of BEV adoption intention were identified and classified into 5 categories: psychological, behavioral, product attributes, contextual, and demographic. Meanwhile, only a few studies examine BEV's actual adoption behavior. Antecedents of adoption behavior were categorized into 4 groups, namely, psychological, behavioral, contextual, and demographic. Conclusion: BEV adoption can be influenced by both internal and external factors. There is a gap in research between intention and behavior in previous studies related to BEV adoption. While determinants of intention are the topic of many studies, actual behavior is more important but limitedly explored. Future research can focus on adoption behavior in newly developed markets with real data rather than utilizing self-reported responses to better analyze actual behavior.
    Type of Medium: Online Resource
    ISSN: 1874-4478
    Language: English
    Publisher: Bentham Science Publishers Ltd.
    Publication Date: 2022
    detail.hit.zdb_id: 2396025-5
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  • 8
    Online Resource
    Online Resource
    Viet Nam National University Ho Chi Minh City ; 2015
    In:  Science and Technology Development Journal Vol. 18, No. 3 ( 2015-08-30), p. 153-161
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 18, No. 3 ( 2015-08-30), p. 153-161
    Abstract: The variation of lamellar structures of poly(styrenesulfonic acid)-grafted poly (ethylene-co-tetrafluoroethylene) proton exchange membranes dependence on preparation procedures and grafting degree (GD) was investigated by small angle X-ray scattering. The detail structures of lamellar including lamellar period L, thickness of lamellar crystal Lc, thickness of lamellar amorphous La, and linear crystallinity Lc/L were examined by a 1D correlation function. The lamellar structures were recognized at the grafting step and did not change under the sulfonation process. With GD  79 %, Lc significantly decreased (corresponding to the increase of La) and then retained in the GDs of 79-117 %. Note that the retained values of Lc, La, and linear crystallinity in the GDs of 79-117 % are the origin of high conductivity and mechanical strength of membranes under severe operation conditions for fuel cell applications.
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2015
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  • 9
    In: Chemistry & Biodiversity, Wiley, Vol. 18, No. 4 ( 2021-04)
    Abstract: A new xanthone derivative, aspidxanthone A ( 1 ), and three known compounds ((2 S )‐1‐(β‐D‐galactopyranosyloxy)‐3‐(hexadecanoyloxy)propan‐2‐yl (9 Z ,12 Z )‐octadeca‐9,12‐dienoate ( 2 ), (25 S )‐spirostane‐1 β ,3 α ,5 β ‐triol ( 3 ), and asparenyldiol ( 4 )) were isolated from the whole of the endemic species Aspidistra letreae in Vietnam. Their structures were elucidated by means of extensive spectroscopic analyses and comparison with published data. In this study, we report the isolation and structure elucidation of a new compound aspidxanthone A, antioxidant activities of the extract and isolates 1 – 4 , and in silico molecular docking of aspidxanthone A. The ethyl acetate extract had good antioxidant activity with an IC 50 value of 26.3 μg mL −1 . Among the isolates, aspidxanthone A exhibited DPPH reduction activity with an IC 50 value of 11.2 μM, which is in the same range as that of the positive control, ascorbic acid. The mechanism of action of aspidxanthone A on the tyrosinase and xanthine oxidase proteins have been clarified by in silico studies.
    Type of Medium: Online Resource
    ISSN: 1612-1872 , 1612-1880
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2021
    detail.hit.zdb_id: 2139001-0
    SSG: 12
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  • 10
    In: BioMed Research International, Hindawi Limited, Vol. 2021 ( 2021-4-6), p. 1-10
    Abstract: Distichochlamys benenica is a native black ginger that grows in Vietnam. In point of fact, there is limitation of available information in the literature making mention of the chemical constituents and bioactive properties of this plant. This study is aimed at isolating trans-o-coumaric acid (1), trans-cinnamic acid (2), and borneol (3) from the rhizomes of D. benenica Q.B.Nguyen & Škorničk and evaluate the anti-inflammatory and antimicrobial activities of 1-3 using the carrageenan paw edema model and the dilution broth method, respectively. This revealed that 1 was as effective as diclofenac in reducing the intensity of the edema development. The in silico research showed that the activity of 1 might be derived from inhibiting COX-2 by generating h-bonds at the positions of Arg 120, Tyr 355, and Arg 513 residues. The antimicrobial activities against Gram-positive strains (Staphylococcus aureus and Bacillus subtilis) were comparable, with the minimum inhibitory concentrations ranging from 1.52 to 3.37 mM. This is the first study of the bioactivity of compounds isolated from D. benenica Q.B.Nguyen & Škorničk. Our results suggest that 1 may be a nature-derived compound which demonstrates the anti-inflammatory properties and inhibit the proliferation of several Gram-positive bacteria.
    Type of Medium: Online Resource
    ISSN: 2314-6141 , 2314-6133
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2698540-8
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