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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (11)
  • 2020-2024  (11)
Material
Publisher
  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (11)
Person/Organisation
Language
Years
  • 2020-2024  (11)
Year
  • 1
    Online Resource
    Online Resource
    Removal of methylene blue from aqueous solution by biochar derived from rice husk
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Earth Sciences ( 2022-03-15)
    Details
    In: Vietnam Journal of Earth Sciences, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), ( 2022-03-15)
    Abstract: In this research, rice husk-derived biochar (BC) was evaluated to determine the suitable conditions for the methylene blue (MB) solution adsorption. The characterization of BC was identified by the methods of FT-IR, Raman, and point of zero charges (PZC). The adsorption studies were carried out with BC at different activation conditions (raw BC, HNO3 25% for 4 hours, NaOH 25% for 4 hours, H2O at 90°C for 2 hours and 4 hours, HNO3 25% at 90°C for 2 hours and 4 hours). The activated material then went through an adsorption assessment. Activated BC with NaOH 25% showed its preeminence compared to the other six conditions when reaching the maximum efficiency after the first hour of adsorption. The investigation revealed that the adsorption capacity of the material depends on the activation methods, including pH, activation agent, temperature, and time. The adsorption of BC was consistent with the pseudo-first-order kinetic model and the Langmuir isotherm model, with high correlation coefficients (R2: 0.9838 and 0.9975, respectively). Therefore, it can be concluded that the use of rice husk is feasible for the removal of MB from aqueous solutions.
    Type of Medium: Online Resource
    ISSN: 2615-9783 , 2615-9783
    URL: Article
    DOI: 10.15625/2615-9783/16998
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 2
    Online Resource
    Online Resource
    Growth and metal removal efficiency of the green algae Schroederia setigera and Selenastrum bibraianum exposed to nickel, zinc and cadmium
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Vietnam Journal of Science and Technology Vol. 58, No. 5A ( 2020-11-12), p. 22-
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 58, No. 5A ( 2020-11-12), p. 22-
    Abstract: Heavy metal contamination is among the globally environmental and ecological concerns. In this study we assessed the development of the two green algae Schroederia setigera and Selenastrum bibraianum under exposures to 5 – 200 µg/L of Ni, Zn, and Cd in the laboratory conditions. Heavy metal removal efficiency of S. setigera was also tested in 537 µg Ni/L, 734 µg Zn/L, and 858 µg Cd/L. We found that the exposures with these heavy metals caused inhibitory on the growth of S. bibraianum. The S. bibraianum cell size in the 200 µg Zn/L treatment was around two times smaller than the control. However, Zn and Cd at the concentration of 200 µg/L did not inhibit the growth of S. setigera over 18 days of exposure. The S. setigera also grew well during 8 days exposed to Ni at the same concentration. Besides, the alga S. setigera could remove 66% of Zn, 18% of Cd and 12% of Ni out of the test medium after 16 days of incubation. The Vietnam Technical Regulation related to metals should be considered for ecological protection. We recommend to test the metal removal by the alga S. setigera at pilot scale prior to apply it in situ
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/58/5A/15183
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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  • 3
    Online Resource
    Online Resource
    Synthesis of graphene oxide-TiO2 nanotubes-silver nanoparticles nanocomposite by gamma irradiation for antibacterial and post-harvest preservation purposes
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Vietnam Journal of Biotechnology Vol. 17, No. 4 ( 2020-11-02), p. 719-727
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 17, No. 4 ( 2020-11-02), p. 719-727
    Abstract: In this study, graphene oxide (GO)-TiO2 nanotubes (TNTs)-silver nanoparticles (AgNPs) nanocomposites were synthesized under γ-ray irradiation at different doses (5, 10, 15, 20 and 25 kGy) from formerly synthesized GO, TNTs and AgNPs. They were then characterized by Fourier-transformed infrared (FTIR) and ultra-violet-visible (UV-Vis) spectroscopies, as well as by scanning electron (SEM) and transmission electron (TEM) microscopes. The spectral data indicated the assemblage of silver nanoparticles on both GO sheets and TiO2 nanotubes, as well as the assemblage of TiO2 nanotubes on GO sheets. In addition, their antibacterial activity against Escherichia coli and post-harvest preservation were investigated. Fresh bunches of green grapes were used for this study. AATCC 100-2012 and ISO 21527-1:2008 standards were used for all experiments. The obtained results indicated that all nanocomposite samples exhibited very high antibacterial activity against E. coli. Among which, the 20 kGy sample showed the highest value. Moreover, two samples (5 kGy and 25 kGy) possessed the lower number of yeasts and molds than that of control sample, indicating that the nanocomposites had partial contribution to the preservation of post-harvest crops. We have also found in this study that the dose range affected the antibacterial activity and preservation; and the highest dose range, however, was not always ideal for that purpose. With such fascinating properties, GO-TNTs-AgNPs will be the promising material for antibacterial and agricultural applications.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/17/4/14635
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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  • 4
    Online Resource
    Online Resource
    Effects of PMSG and HCG on estradiol and progesterone levels from common palm civets (Paradoxurus hermaphroditus)
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Biotechnology Vol. 19, No. 1 ( 2021-07-18), p. 85-94
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 1 ( 2021-07-18), p. 85-94
    Abstract: The common palm civets (Paradoxurus hermaphroditus) belong to the civets family (Viverridae), the carnivores order (Carnivora). This animal is widely distributed in South and Southeast Asia. Currently, the civets are raised quite popular in Vietnam. The delay in breeding for the first time and slow in the rut has reduced economic efficiency in civet farming. This study was carried out to evaluate the effectiveness of different doses of hormones (PMSG, HCG) on sex hormonal changes in the civets. A total of 54 female civets were used in this experiment. PMSG/HCG intramuscularly in 3 formulations (CT): CT1: 20 IU PMSG + 10 IU HCG; CT2: 30 IU PMSG + 15 IU HCG; CT3: 40 IU PMSG + 20 IU HCG. The results showed that E2 level in the feces of the civets in the treatments began to increase at the first day after injection and peaked on the second day. P4 concentration in the experimental civet groups began to increase in the first day and peaked on the 3rd or 4th day. The amounts of E2 and P4 in the feces of the civet group injected with CT3 was significantly higher than that of CT1 and CT2 groups (P 〈 0.05). This result provides reliable references for subsequent studies on the use of gonadotropin on the common palm civets to both exploit and preserve the ex-situ conservation of this rare wildlife.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/14451
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    EFFECTS OF SYNTHESIS CONDITIONS ON STRUCTURE OF TIN NANORODS PREPARED BY SURFACTANT-ASSISTED CHEMICAL REDUCTION METHOD
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Science and Technology Vol. 59, No. 6A ( 2022-03-11), p. 168-175
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 59, No. 6A ( 2022-03-11), p. 168-175
    Abstract: Metallic nanorods/nanowires have recently become the focus of intensive research due to their unique properties and have been used to fabricate electronic, energy devices and sensors in nanoscale. In this study, tin nanorods were synthesized through a surfactant assisted chemical reduction method in aqueous solutions at low temperature (~ 0 oC). Sodium dodecyl sulfate (SDS) and sodium borohydride (NaBH4) were used as the surfactant and reductant, respectively. Parameters such as pH, surfactant concentration, and temperature were studied to control the diameter and length of the nanorods formed. The structure, composition and surface morphology of the obtained products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the morphology as well as the aspect ratio of tin nanorods could be effectively controlled by adjusting the parameters of the synthesis process. It was found that tin nanoparticles were formed at 30 oC while nanorods appeared at lower temperatures (0, 5 oC). A low SDS concentration of 4 mM helped to form Sn nanoparticles but higher SDS concentrations of 8, 12 mM facilitated the growth of nanorods. The increase of SDS concentration reduced the length of nanorods. pH values less than 4.5 were found to be favorable to the formation of nanorods.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/16222
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Growth and development of \(\textit{Eleocharis ochrostachys}\) Steud. reproduced from its tubers
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Academia Journal of Biology Vol. 43, No. 3 ( 2021-09-20), p. 69-75
    Details
    In: Academia Journal of Biology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 43, No. 3 ( 2021-09-20), p. 69-75
    Abstract: In this study, the growth and development of Eleocharis ochrostachys were investigated in a control condition. Its tubers of the plant sprouted to produce stems after being cultured in plastic pots for several days. After 120 days, the plant grew to a height of 42.8 cm on average, stem diameters were from 1.5 to 2.0 mm, and the plant started to bloom and produce tubers. The plant spikelet had dimensions of 1.0–2.0 cm high, 2.0–2.5 mm wide after 120 days. The achenes were formed after 128–130 days, had dimensions of 1.15–1.20 mm long, and 0.5–0.7 mm wide when the plant was cultured for 150 days. The tubers had dimensions of 7.0–9.0 mm long, 4.0–6.0 mm diameter, and were about 0.06–0.1 grams after 150 days. This study provided information on the development of Eleocharis ochrostachys cultured in the greenhouse.
    Type of Medium: Online Resource
    ISSN: 2615-9023 , 2615-9023
    URL: Article
    DOI: 10.15625/2615-9023/15908
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 7
    Online Resource
    Online Resource
    Assessment of fungi and viruses in Artichoke (Cynara scolymus L.) in Da Lat, Lam Dong province
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Biotechnology Vol. 18, No. 4 ( 2021-05-24), p. 679-691
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 18, No. 4 ( 2021-05-24), p. 679-691
    Abstract: Artichoke (Cynara scolymus L.), a high economic value crop, was brought to Vietnam by the French in the late 19th century. The artichoke was mainly planted in Lam Dong, Lao Cai, Vinh Phuc provinces, etc. At present, the disease situation of Artichoke plants and the lack of disease-free seedlings result in insufficient source of Artichoke for producers. Artichoke plants are mainly vegetative propagation and pathogens easily transferred from mother to daughter plants. Therefore, low propagation rate and fungal infection are two main factors hindering the expansion and development of Artichoke cultivation (in Lam Dong). Therefore, studying and evaluating the situation of fungi and viruses as well as establishing the in vitro propagation procedures in order to produce high number of disease-free seedlings are urgent for the current Artichoke shortage. In this study, samples of purple and white Artichoke varieties, which suspected fungal manifestations, were collected to assessment of fungi and viruses in artichoke. In addition, in vitro propagation by cultivating apical meristem was applied to produce disease-free seedlings. The recorded results showed that, 19 strains of mold were identified on purple and white Artichoke belonged to nine genera including Mucor (M. sp., M. circinelloides, M. fragilis, M. irregularis, and M. racemosus), Alternaria (Alternaria sp., A. alterinata, A. gaisen, A. tenuissima, and A. tillandsiae), Fusarium (F. acuminatum and F. solani), Cylindrobasidium (Cylindrobasidium sp1 and Cylindrobasidium sp2), Actinomucor elegans, Curvalaria clavata, Plectosphaerella oligotrophica, Phoma herbarum, Rhizomucor variabillis; meanwhile, the Tomato mosaic virus (ToMV) was isolated only purple Artichoke. Shoot explants obtained from apical meristem culture were completely disease-free and used for micropropagation at the next stage.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/18/4/15130
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 8
    Online Resource
    Online Resource
    Evaluating photosynthetic performance of transgenic soybean harboring CKX13 under salinity conditions
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2023
    In:  Vietnam Journal of Biotechnology Vol. 21, No. 1 ( 2023-08-26), p. 83-92
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 21, No. 1 ( 2023-08-26), p. 83-92
    Abstract: Cytokinins (CKs) are considered one of the critical phytohormones with an important role in plant response to abiotic stresses. One of the key enzymes in regulating CK levels is CK oxidase/dehydrogenase (CKX), which catalyzes the irreversible CK degradation. Although CKX gene members in soybean (Glycine max) have been identified, their importance in plant tolerance against salinity has not yet been fully elucidated. In this study, GmCKX13, a gene with upregulated expression in various tissues of soybean at various stages under water deficit condition as shown in previous investigation, was selected for exploring its role in relation to photosynthetic performance under salt stress conditions. The results showed that the transgenic soybean overexpressing GmCKX13 could maintain a better assimilation rate compared to their wild-type (WT) counterparts under the salinity condition. This could be explained by the higher chlorophyll content and the less damage caused by the stress in the photosynthetic machinery of the transgenic plants. According to the analyses, the transformers displayed higher values of maximal photosystem II (PSII) photochemical efficiency (Fv/Fm), maximal quantum yield of primary PSII photochemistry (φPo), quantum yield for electron transport (φEo) and efficiency for electron being transferred from QA- to plastoquinone (ψEo). The evaluation for the overall photosynthetic performance using performance index in absorption basis (PIABS) also supported the differential photosynthesis potential between the two genotypes. Collectively, these findings suggested that appropriate GmCKX13 modulation could enhance photosynthetic adaptation to salt-stressed conditions in soybeans.
    Type of Medium: Online Resource
    ISSN: 2815-5912 , 2815-5955
    URL: Article
    DOI: 10.15625/1811-4989/17661
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2023
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  • 9
    Online Resource
    Online Resource
    Effect of exogenous melatonin on antioxidant enzyme activities and membrane lipid peroxidation in avocado fruit during ripening
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Biotechnology Vol. 20, No. 3 ( 2022-09-30), p. 495-504
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 20, No. 3 ( 2022-09-30), p. 495-504
    Abstract: Melatonin functions as a plant growth regulator, has diverse functions and plays an important role in ripening and fruit senescence. In the current study, we investigated the effect of exogenous melatonin (0.1 mM and 0.5 mM) on reactive oxygen species (ROS) metabolism, membrane lipid peroxidation and antioxidant enzyme activity of avocado (Persea americana Mill. cv. 034) during fruit ripening at 22oC ± 1 and 75-80% relative humidity (RH). The results showed that postharvest fruits treated with 0.5 mM melatonin effectively reduced the accumulation of superoxide anion (O2.), hydrogen peroxide (H2O2) and malondialdehyde (MDA) in the mesocarp of the fruit. In addition, melatonin treatment also significantly promoted the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in avocado. It is suggested that enhanced antioxidant enzyme activity induced by melatonin treatment may contribute to scavenge ROS and alleviating membrane lipid peroxidation in avocado fruit. The results indicate that the MT application might collectively contribute to the delay senescence and maintain postharvest quality of avocado.
    Type of Medium: Online Resource
    ISSN: 2815-5912 , 2815-5955
    URL: Article
    DOI: 10.15625/1811-4989/17191
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 10
    Online Resource
    Online Resource
    Feature Properties of Photonic Crystal Fiber with Hollow Core Filled Nitrobenzene
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Communications in Physics Vol. 30, No. 4 ( 2020-10-20), p. 331-
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 30, No. 4 ( 2020-10-20), p. 331-
    Abstract: In this paper, a photonic crystal fiber (PCF) with core infiltrated with Nitrobenzene is proposed and investigated. Its feature properties as the effective refractive index, effective mode area, chromatic dispersion, and confinement loss have been numerically simulated. The obtained results show that characteristic quantities of PCF with core infiltrated with Nitrobenzene (PCF-N) having some advantages in comparison to PCF with core infiltrated with Toluene (PCF-T) at 1.55μm wavelength. For the purpose of supercontinuum generation, two optimal structures with lattice constants 2.0μm and 2.5μm with filling factors d/Ʌ = 0.3 are identified.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166-30-4
    DOI: 10.15625/0868-3166/30/4/14888
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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