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  • 1
    Online Resource
    Online Resource
    Using biochar from spent coffee grounds to treat pollution in livestock wastewater
    Hanoi University of Mining and Geology ; 2020
    In:  Journal of Mining and Earth Sciences Vol. 61, No. 5 ( 2020-10-31), p. 135-144
    Details
    In: Journal of Mining and Earth Sciences, Hanoi University of Mining and Geology, Vol. 61, No. 5 ( 2020-10-31), p. 135-144
    Abstract: Four types of biochar material synthesized from spent coffee grounds by slow pyrolysis process CF1 (500(C/0.5h); CF2 (500(C/1.5h); CF3 (500(C/3h); CF4 (500(C/6h) is studied to treat two pollution parameters (COD and TSS) in livestock wastewater. Material characteristics were determined by SEM, EDX and BET methods. The results showed that the 4 samples of biochar materials were structured fiber clearly, the interplanar spacing which corresponds to the lattice plane. The C content in the biochar sample is higher than the initial raw material sample; the highest value recorded reaches 90.61% C (CF2). 100 mL of the original livestock waster water is filtered through columns with 4g of biochar CF1-CF4 during reaction times varied from 0h, 1h, 4h and 8h, the COD treatment efficiency and adsorption content of CF4 sample is highest of 96.41% and 188 mg/g after 8h, and the lowest value is 76.67% and 149.5 mg/g after 1h recorded in CF3 sample, however the COD value after treatment is still higher from 1.2 to 1.46 times than Vietnamese standard 62: 2016/MONRE - national technical regulation on the effluent of livestock. The CF3 material samples have the highest TSS treatment efficiency and adsorption content of 95.19% and 6.425 mg/g after 8h and the lowest of 66.78% and 4.575 mg/g recorded in CF1 samples after 1h, response the requirements of QCVN 62: 2016/MONRE. The results showed that biochar is a potential sorbent to removed pollutants from waste water.
    Type of Medium: Online Resource
    ISSN: 1859-1469 , 1859-1469
    URL: Issue
    URL: Article
    DOI: 10.46326/JMES.2020.61(5)
    DOI: 10.46326/JMES.2020.61(5).15
    Language: Vietnamese
    Publisher: Hanoi University of Mining and Geology
    Publication Date: 2020
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  • 2
    Online Resource
    Online Resource
    Iron-reducing - and -proteobacteria isolated from laboratory-scaled heterotrophic feammox bioreactor
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Biotechnology Vol. 19, No. 2 ( 2021-08-02), p. 359-369
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 2 ( 2021-08-02), p. 359-369
    Abstract: Ammonium removal from wastewater is a crucial step in wastewater treatment. Presently employed technologies based on nitrification/denitrification and partial nitritation/anammox principles require oxygen for the nitrification step, and are therefore still not yet fully satisfied with the application practice. In recent years, biological ammonium oxidation coupled with ferric iron reduction (feammox) has been proposed to be responsible for the nitrogen loss in different ecological habitats. Related to the wastewater aspect, the feammox principle has been discussed as an alternative approach for ammonium removal without dependency on oxygen. From a laboratory-scaled feammox bioreactor operated under neutral pH, two bacterial strains FN7 and FN9 were isolated by using the anaerobic Hungate technique. Comparative analyses of 16S rDNA sequences showed that these strains were most closely related to the b-proteobacterium Aciclyphilus denitrificans and the g-proteobacterium Pseudomonas stutzeri, respectively. Although being phylogenetically apart, strains FN7 and FN9 shared several common physiological characteristics that are considered meaningful for the feammox process, i.e. (i) heteroptrophic ammonium oxidation, (ii) denitrification, and (iii) ferric iron reduction. These isolates are proposed to play certain roles in the studied feammox system, contributing to the ammonium removal under heterotrophic feammox condition. The 16S rDNA sequences of strains FN7 and FN9 were available in GenBank under the accession numbers LC474369 and MT568614, respectively.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/16333
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2021
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  • 3
    Online Resource
    Online Resource
    Characterization of petroleum-degrading bacteria from oil-contaminated sites in Vietnam
    Elsevier BV ; 1999
    In:  Journal of Bioscience and Bioengineering Vol. 88, No. 1 ( 1999-1), p. 100-102
    Details
    In: Journal of Bioscience and Bioengineering, Elsevier BV, Vol. 88, No. 1 ( 1999-1), p. 100-102
    Type of Medium: Online Resource
    ISSN: 1389-1723
    URL: Article
    DOI: 10.1016/S1389-1723(99)80184-4
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1999
    detail.hit.zdb_id: 2016440-3
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Synthesis and Cytotoxic Activity of Several Novel N -Alkyl-Plinabulin Derivatives With Aryl Group Moieties
    SAGE Publications ; 2021
    In:  Natural Product Communications Vol. 16, No. 4 ( 2021-04), p. 1934578X2110100-
    Details
    In: Natural Product Communications, SAGE Publications, Vol. 16, No. 4 ( 2021-04), p. 1934578X2110100-
    Abstract: Seven novel N-alkyl-plinabulin derivatives with aryl groups moieties (nitroquinoline, 1,4-dihydroquinoline, 4-methoxybenzene, and 4-chlorobenzene) have been synthesized via aldol condensation and alkylation in one-pot, and tested for their cytotoxicity against 4 cancer cell lines (KB, HepG2, Lu, and MCF7). Compounds ( Z)−3-((6,8-dimethyl-4-oxo-1,4-dihydroquinolin-2-yl)methylene)−6-(( Z)−4-methoxybenzylidene)−1-(prop-2-yn-1-yl)piperazine-2,5-dione (5a), ( Z)−6-(( Z)−4-methoxybenzylidene)−1-(prop-2-yn-1-yl)−3-((1,6,8-trimethyl-4-oxo-1,4-dihydroquinolin-2-yl)methylene)piperazine-2,5-dione (5b), and ( Z)−3-(( Z)−4-chlorobenzylidene)−1,4-dimethyl-6-((8-methyl-4-nitroquinolin-2-yl)methylene)piperazine-2,5-dione (8) showed strong cytotoxicity against 3 of the cancer cells lines (KB, HepG2 and Lu) with IC 50 values ranging from 3.04 to 10.62 µM. The quinoline-derived compounds had higher cytotoxic activity than the benzaldehyde derivatives. The successful synthesis of these derivatives offers useful information for the development of more potent vascular disrupting agents based on plinabulin.
    Type of Medium: Online Resource
    ISSN: 1934-578X , 1555-9475
    URL: Article
    DOI: 10.1177/1934578X211010040
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2430442-6
    SSG: 15,3
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  • 5
    Online Resource
    Online Resource
    Nghiên cứu ứng dụng chủng xạ khuẩn Streptomyces griseus VTCC 41724 trong phòng chống bệnh thối gốc lúa do vi khuẩn Dickeya zeae
    Trung tâm Nhiệt đới Việt - Nga ; 2022
    In:  Tạp chí Khoa học và Công nghệ nhiệt đới ( 2022-8)
    Details
    In: Tạp chí Khoa học và Công nghệ nhiệt đới, Trung tâm Nhiệt đới Việt - Nga, ( 2022-8)
    Abstract: Foot rot disease caused by Dickeya zeae in rice has been recently concerned in Vietnam, though there has not been a specific prevention and treatment measure. Streptomyces griseus strain VTCC 41724 has been previously reported for the antagonistic properties against Dickeya zeae and other plant pathogenic bacteria, it is therefore investigated for the capability of controlling this disease. Thus, the strain is selected for further studies aiming to application in organic rice cultivation. In this study, the appropriate culture conditions for strain VTCC 41724 to grow and release bioactive substances inhibiting D. zeae were determined, i.e. 2M medium, 5 days, 5% inoculum, and shaking at 160 rpm at 30C. A microbial formulation SGB was created from biomass of strain VTCC 41724 (7.1  108 CFU/g) and tested for its effectiveness in controlling the foot rot disease caused by Dickeya zeae under net house conditions. The experiment was carried out on Bac Thom No.7 rice variety, applied the SGB formulation in the soil before the seed and during the disease symptoms, has resulted in a protective efficiency as high as 73.56%. In addition, strain Streptomyces griseus VTCC 41724 also showed the antagonistic activity against harmful fungi including Phytophthora capsici, Alternaria sp., Colletotrichum gloeosporioides and Fusarium sp. This preliminary results showed the potential application of actinomycetes in biological control of foot rot caused by D. zeae, and other microbially mediated plant diseases.
    Type of Medium: Online Resource
    ISSN: 0866-7535
    URL: Journal
    URL: Article
    DOI: 10.58334/vrtc.jtst
    DOI: 10.58334/vrtc.jtst.n25.05
    Language: Unknown
    Publisher: Trung tâm Nhiệt đới Việt - Nga
    Publication Date: 2022
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  • 6
    Online Resource
    Online Resource
    Elimination of iron from acidic mine drainage (AMD) in the co-treatment with poultry wastewater through a sulfate-reducing bioreactor
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2016
    In:  Vietnam Journal of Biotechnology Vol. 14, No. 2 ( 2016-06-30), p. 369-375
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 14, No. 2 ( 2016-06-30), p. 369-375
    Abstract: Acid mine drainage (AMD) is contaminated water from mining indistry, characterized by low pH (1 – 4) and high concentration of heavy metals (up to thousands ppm). AMD is highly toxic to aquatic life and soil ecology surrounding the mining areas, therefore should be treated adequately before discharging to the environment. The treatment technology based on sulfate-reducing bioreactors has been applying widely with high efficiency. Sulfate-reducing bacteria (SRB) stand at the central point of the technology, use hydrogen and organic carbons to reduce sulfate to sulfde, that involve in metal precipitation and pH neutralization. For establishing the technology, sources of SRB as well as organic substrates neccesary for the bacteria should be acquired from outside. In many cases, these two requirements can be supplied from cow manure and agriculture residues (such as rice straws) added to the bioreactor before operating. In the present study, a mixed culture of SRB enriched from aquaculture-processing wastewater was used to start up the sulfate-reducing bioreactor for the AMD-treatment laboratory model. Cotreatment of AMD and poultry wastewater in this model operated under continuous mode with retention time of 48 h allowed to remove 85 – 88% Fe2+ in the AMD (from the original concentration of 200 mg/L). Study of the bacterial community via DGGE analyses of the 16S rDNA fragments showed that the enrichment culture consisted of three main SRB genera Desulfovibrio, Desulfomicrobium and Desulfobulbus spp., whereas in the sediment of the bioreactor only Desulfovibrio spp were found dominating. The obtained results would serve as basis for the development of biological-based technology to treat AMD together with organic-rich wastewater sources, suitable for mines located closely to residential areas.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/14/2/9363
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2016
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  • 7
    Online Resource
    Online Resource
    Taxonomic and ecological studies of actinomycetes from Vietnam: isolation and genus-level diversity
    Springer Science and Business Media LLC ; 2011
    In:  The Journal of Antibiotics Vol. 64, No. 9 ( 2011-9), p. 599-606
    Details
    In: The Journal of Antibiotics, Springer Science and Business Media LLC, Vol. 64, No. 9 ( 2011-9), p. 599-606
    Type of Medium: Online Resource
    ISSN: 0021-8820 , 1881-1469
    URL: Article
    DOI: 10.1038/ja.2011.40
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2011
    detail.hit.zdb_id: 2135645-2
    SSG: 15,3
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  • 8
    Online Resource
    Online Resource
    Isolation of a methane-oxydizing bacterium for the study on single cell protein production from methane
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2016
    In:  Vietnam Journal of Biotechnology Vol. 14, No. 3 ( 2016-09-30), p. 581-588
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 14, No. 3 ( 2016-09-30), p. 581-588
    Abstract: Single cell protein (SCP) can be produced from biomass of different types of microorganisms that have high protein content such as yeast, filamentous fungi, algae and bacteria. In comparison to animal and plant protein sources, this kind of protein has several advantages, namely high protein and nutrient contents, being produced in fermenters with the use of variety of organic wastes, independence in agriculture land or climate conditions. Methane oxidizing bacteria (MOB) are considered as good candidates for SCP production and have been intensively studied recently. In the present study, a MOB strain BG3 was isolated from wastewater of an anaerobic digester via enrichment and isolation procedures using methane as the only carbon and energy sources. Strain BG3 comprised of oval-shaped cells of 0,8-1´16 -1,8 μm in size, almost nonmotile. Based on comparative analyses of the 16S rDNA partial sequences, strain BG3 was identified as a member of the Methylomonas genus, the most closely related species was Methylomonas koyamae (97% homology). This was also confirmed by analyses of sequence of the pmoA gene, encoding for a-subunit in the methane-monooxygenase in the strain.  Besides methane, strain BG3 also utilized methanol for the growth. It has been shown that methane-fed culture of strain BG3 could produce 68.69 g crude protein per 100 g CDW and the according methane to biomass conversion efficiency was 2,8 m3 methane×kg-1 dry biomassas. Owing the capability of utilization of methane, the second important greenhouse gas, for the production of protein source for animal feed, strain BG3 would have a great application potential in Vietnam. Strain BG3 was designated as Methylomonas sp. BG3 and its 16S rDNA and pmoA gene sequences were deposited at the GenBank with accession numbers of KJ081955 and KJ081956, respectively.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/14/3/9876
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2016
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  • 9
    Online Resource
    Online Resource
    Treatment of acidic wastewater from thien ke tin processing factory by sulfate reducing bioreactor: a pilot scale study
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Biotechnology Vol. 14, No. 4 ( 2018-04-19), p. 777-784
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 14, No. 4 ( 2018-04-19), p. 777-784
    Abstract: A pilot-scale system of a total volume of 6 m3 using sulfate reducing (SR) bioreactor technology was established for the treatment of acidic wastewater from Thien Ke tin processing factory in Tuyen Quang province, Vietnam. In the system, the acidic wastewater with high metal content went first to a collecting tank filled with limestone gravels to increase pH to a value favorable for SRB growth, and at the second step to a SR bioreactor where sulfate reduction occurred to produce sulfide for metal precipitation. To activate the SR bioreactor, a laboratory SRB mixed culture dominated by Desufovibiro, Desulfobulbus and Desulfomicrobium species was added at a cell density of 106 cell/ml so that a full activation was achieved just after a week of incubation. Molasses was added to the SR bioreactor at 0.5 ml/L as substrate for the SRB growth during the operation. The performance of the system was studied under batch and continuous modes. The batch mode showed good results after three day-operation. The pH increased from 2.8 – 3.2 to 7 – 7.2, and a total of 750 mg/L sulfate was reduced to sulfide presumably by the SRB. The produced sulfide efficiently removed metals from the wastewater, such as iron from 143.1 mg/L to 0.3 mg/L, copper from 16.32 mg/L to 0.04 mg/L and manganese from 10.9 mg/L to 0.05 mg/L. The continuous mode with a hydraulic load of 100 l/h and an according retention time of three days showed constitutive contaminant removal. The effluent pH of the system was around 7 within six-day period. The sulfate reduction was active, keeping sulfate concentration in the final effluent as low as  150 mg/L. Accordingly, the three most metal contaminants (iron, copper and manganese) were found at concentrations below the regulated limits. The results showed the possibility of applying SR bioreactor technology for the treatment of AMD is feasible and the use of previously enriched mixed culture of SRB could be a good approach to shorten the activation period of the SR bioreactor.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/14/4/12313
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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  • 10
    Online Resource
    Online Resource
    EFL STUDENT’S PROBLEMS WITH PARAGRAPH WRITING AT TAY DO UNIVERSITY, VIETNAM
    Open Access Publishing Group ; 2021
    In:  European Journal of English Language Teaching Vol. 6, No. 4 ( 2021-07-08)
    Details
    In: European Journal of English Language Teaching, Open Access Publishing Group, Vol. 6, No. 4 ( 2021-07-08)
    Abstract: This paper studied problems in EFL students’ paragraph writing. The research participants were first-year students of English in Tay Do University (TDU). To achieve the desired aims of the current study, the researcher combined both qualitative and quantitative methods, using questionnaires, interviews, and observations as the main instruments. The researcher used the package of social sciences (SPSS) for analysis. Research results showed that the freshmen at TDU often encountered problems in writing paragraphs. These accounted for grammatical structures, vocabulary, and coherence. Basing on the research results, students could recognize their difficulties when writing and find some new ways to overcome them. It is suggested that teachers should find and update some new teaching methods so as to develop students’ paragraph writing skills. 〈 p 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 Article visualizations: 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 img src="/-counters-/edu_01/0920/a.php" alt="Hit counter" / 〉 〈 /p 〉
    Type of Medium: Online Resource
    ISSN: 2501-7136 , 2501-7136
    URL: Article
    DOI: 10.46827/ejel.v6i4.3778
    Language: Unknown
    Publisher: Open Access Publishing Group
    Publication Date: 2021
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