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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (35)
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  • Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)  (35)
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  • 1
    Online Resource
    Online Resource
    Updated heat capacities of \(^{161-164}\)Dy nuclei
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2023
    In:  Communications in Physics Vol. 33, No. 2 ( 2023-03-16)
    Details
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 33, No. 2 ( 2023-03-16)
    Abstract: This work presents the updated heat capacities of \(^{161-164}\)Dy nuclei in the nuclear temperature region from 0 to 1 MeV. The updated heat capacities are obtained within the canonical ensemble method making use of the most recent and recommended experimental nuclear level density (NLD) data together with those calculated within the back-shifted Fermi gas (BSFG) model with energy-dependent parameters. By comparing the updated heat capacities with the un-updated ones, which are obtained by using the old experimental NLD data and the BSFG with energy-independent parameters, we found that the updated and un-updated heat capacities are almost identical at low temperature, but differ from each others at high temperature. This discrepancy can be interpreted by the damping of nuclear shell structure with increasing the excitation energy. Besides, we observe that the S-shape in the updated heat capacities is much more pronounced in even-even Dy isotopes than in even-odd ones, whereas the un-updated heat capacities do not clearly exhibit this S-shape. Therefore, the updated heat capacities should provide a more convincing evidence for the signature of pairing phase transition in nuclear systems.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    URL: Article
    DOI: 10.15625/0868-3166/2023Vol33No2
    DOI: 10.15625/0868-3166/17582
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2023
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  • 2
    Online Resource
    Online Resource
    Sequencing and analysis of complete genome of the attenuated Hanvet1.VN strain used for vaccine production against porcine reproductive and respiratory syndrome
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Biotechnology Vol. 16, No. 1 ( 2018-12-17), p. 51-57
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 16, No. 1 ( 2018-12-17), p. 51-57
    Abstract: The porcine reproductive and respiratory syndrome virus (PRRSV) attenuated strain Hanvet1.VN has been developed by the Pharmaceutical and Veterinary Material J.S.C (HANVET) by passaging HY-2010 strain on MARC-145 cells for 80 passages and used for PRRS vaccine production. In this study, we sequenced and analyzed the whole genome of the attenuated Hanvet1.VN strain. The total RNA was extracted from the Hanvet1.VN strain, RT-PCR was used for amplification of 15 separate segments of the whole genome. The amplified segments were cloned into the pCR2.1 vector and sequenced by Sanger sequencing. The sequences were analyzed with BioEdit and DNA Star Software. The results showed that, GP5 of the Hanvet1.VN attenuated strain had 100% identity in amino acid (aa) sequences with one of the pathogenic Vietnamese strain isolated in Quang Nam Province and had 98% identity with that of the Chinese 07NM strain. However, the identity of aa sequence of the Hanvet1.VN GP5 was much lower in the comparison with GP5 of VR2332, and it was only 87%. The MP and NP proteins were highly conserved compared with pathogenic strains circulating in Vietnam (07QN) and China (07NM) (99-100%, respectively). The other eight proteins of the Hanvet1.VN strain showed changes from 1.2% in NP1a to 3.9% in GP2 compared with the 07QN strain. However, the aa identity of all Hanvet1.VN proteins were very low when compared with proteins of PRRSV type II strain (North American strain, VR2332), ranged from 86.25% to 97.7%. Our results showed that the Hanvet1.VN attenuated vaccine strain had protective immunogenicity similar to that strain circulating in Vietnam closely related to a strain from China but different from the type II North American strain VR2332. Hence, for importing PRRSV vaccine, especially from American or Europe Countries, antigenic compatibility of the PRRSV vaccine and strains circulating in Vietnam should be concerned in PRRSV vaccine production.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/16/1/13168
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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  • 3
    Online Resource
    Online Resource
    Application of genotyping by sequencing (GBS) for screening single nucleotide polymorphism (SNPs) associated with black tiger shrimp (Penaeus monodon) growth trait
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Biotechnology Vol. 16, No. 1 ( 2018-12-17), p. 75-85
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 16, No. 1 ( 2018-12-17), p. 75-85
    Abstract: Nowadays, the black tiger shrimp (Penaeus monodon) farming in Vietnam still have to face a lot of problems, especially in the Country’s Shrimp Broodstock Production. To overcome these problems, we need a strategy for development of domesticated stocks of P. monodon and rational breeding programs for improved growth and disease resistance. Marker-assisted selection is a procedure that has been developed to avoid these problems associated with phenotypic selection, replacing the selection of the phenotype by selection using markers linked with quantitative trait loci (QTL). Application of next generation sequencing (NGS) associated with QTL to discover important molecular markers has been applied in many laboratories. In this study, we used genome typing by sequencing (GBS) with NGS for screening the SNPs related with growth trait to create a database for father study on the black tiger shrimp fast growth selection. Based on the putative genome sequences created by de novo assembly, 2887 SNPs have been screened, among them, 1799 SNPs appeared only in the fast growth population. Among the 287 annotated contigs, the two contigs were homologous with myosin heavy chain (MHC) associated with growth trait in crustacean species, contig83953 andcontig260347 were homologous with MHCa and MHC1, respectively. The two SNPs Contig83953:g.20T 〉 C and Contig260347:g.19G 〉 A were indicated. We hope that, these results will contribute to the black tiger shrimp genome database for further study to exploit the molecular markers for black tiger shrimp breeding and selections.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/16/1/13169
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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  • 4
    Online Resource
    Online Resource
    PHÂN TÍCH HỆ PHIÊN MÃ VÀ SÀNG LỌC MỘT SỐ GEN GIẢ ĐỊNH LIÊN QUAN TỚI TÍNH TRẠNG TĂNG TRƯỞNG Ở TÔM SÚ (PENAEUS MONODON)
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Biotechnology Vol. 15, No. 3 ( 2018-12-14), p. 471-480
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 15, No. 3 ( 2018-12-14), p. 471-480
    Abstract: Tôm sú (Penaeus monodon) là loài thủy sản nuôi trồng đem lại nguồn lợi lớn cho quốc gia. Trong những năm gần đây, xuất khẩu tôm sú có thể đạt gần một tỷ USD/năm. Tuy nhiên, các dữ liệu về hệ gen và hệ phiên mã của tôm sú còn hạn chế khiến cho việc nghiên cứu phục vụ cho việc chọn tạo giống với những tính trạng quan trọng như tăng trưởng nhanh, kháng bệnh còn gặp nhiều khó khăn. Giải trình tự và phân tích hệ phiên mã tôm sú sẽ cung cấp các dữ liệu quan trọng cho công tác chọn giống tôm sú. Trong nghiên cứu này, từ gói dữ liệu giải trình tự thế hệ mới mô cơ và mô gan tụy tôm sú thu nhận từ vùng biển Bắc Trung Bộ Việt Nam, chúng tôi đã đánh giá, tiền xử l. và lắp ráp de novo hệ phiên mã, tinh sạch và thu được 17.406 unigene với kích thước trung bình là 403,06 bp, N50 là 402 bp. Toàn bộ các unigene trong hệ phiên mã tinh sạch được chú giải với 4 cơ sở dữ liệu khác nhau và đã sàng lọc được 51 unigene liên quan đến tính trạng tăng trưởng. Phân tích biểu hiện cho thấy 16.148 unigene có sự biểu hiện khác biệt giữa mô cơ và mô gan tụy. Những kết quả này sẽ là nguồn dữ liệu hữu ích về hệ phiên mã tôm sú và có thể được áp dụng cho nhiều nghiên cứu tiếp theo đặc biệt trong việc sàng lọc các chỉ thị phân tử liên kết với những tính trạng có . nghĩa kinh tế quan trọng ở tôm sú.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/15/3/13380
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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  • 5
    Online Resource
    Online Resource
    REMOVAL OF NORFLOXACIN BY TiO2-SBA-15 PHOTOCATALYST
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  Vietnam Journal of Science and Technology Vol. 58, No. 3A ( 2020-05-25), p. 13-
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 58, No. 3A ( 2020-05-25), p. 13-
    Abstract: Ordered SBA-15 mesoporous silica support was synthesized by a sol-gel method using triblock copolymer Pluronic P123 and immobilized with different amounts of photocatalyst TiO2. The synthesized composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 adsorption-desorption isotherms. The synthesized materials possessed specific surface areas SBET of 768 m2/g, 544 m2/g, 421 m2/g and 333 m2/g at the TiO2:SiO2 ratio of 0, 0.25, 1.0 and 5.0, respectively. The adsorption capacities and photocatalytic activities under UV light irradiation of these materials were evaluated for Norfloxacin degradation. Experimental results indicate that the highest activity was observed on the sample with TiO2:SiO2 ratio of 1.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/58/3A/14229
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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  • 6
    Online Resource
    Online Resource
    ESSENTIAL OILS OBTAINED FROM EUCALYPTUS AND CYMBOPOGON LEAVES BY STEAM DISTILLATION FOR MAKING NATURAL MIXTURE HAVING EFFECT AS A MOSQUITO REPELLENT
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2021
    In:  Vietnam Journal of Science and Technology Vol. 58, No. 6A ( 2021-03-31), p. 236-
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 58, No. 6A ( 2021-03-31), p. 236-
    Abstract: Abstract-HCTN7. Natural essential oils of plant have been applied over the world becausef these biosafety natural compounds. Applicant levels from the steaming pot among the common people to the raw essential oils or pure extract essence from original natural sources for making special products. Eucalyptus essential oil obtains from Eucalyptus leaves contain 998 mg/L α-eucalyptol, Cymbopogon essential oil obtains from lemon grasses contain 64,8% citral. These essential oils have been paid attention because of there were abundant raw materials in the Mekong Delta area. Therefore, the study was conducted to aim of extracting essential oils from Eucalyptus and Cymbopogon leaves as well as examminate their effect on mosquito repellent. The factors affecting the amount of extracted oils are the time to withered materials (0 h; 2.5 h; 5 h), how the way to preliminary treatment of the materials (crushing or without crushing), the distilled water aidding (400 mL, 500 mL, 600 mL)/300g materials, the distillation time (2 h; 2.5 h; 3 h). The data was evaluated by statistical program. Mixing ratio of Cymbopogon oil: Eucalyptus oil: coconut oil, one of the important criteria to be investigated for evaluating the ability to repel mosquitoes is in turn (40:10:50), (35:15:50), (30:20:50). Experimental results reveal that crushing (Cymbopogon), without crushing (Eucalyptus) of fresh materials, 500 mL of distilled water aidding, 3 h of distillation time were the best during the oil extraction process. The contents of mixing formula of the Cymbopogon essiential oil: Eucalyptus essiential oil: coconut oil (40: 10: 50) is the most effective with the ability to falling mosquitoes only after 5 minutes and killing 84.67% mosquitoes after 24 hours. The natural mixture of Cymbopogon oil, Eucalyptus oil, and coconut oil, safety for human health and more friendly to the environment.Keywords: Coconut oil, Eucalyptus essential oil, Eucalyptus leaves, Cymbopogon essential oil, Cymbopogon leaves, mosquito repellent, steam distillation.Classification numbers:1.4.6.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/58/6A/15548
    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 the genetic changes of the attenuated Hanvet1.vn strain compared with original virulent 02HY strain of the porcine reproductive and respiratory syndrome virus
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Biotechnology Vol. 20, No. 2 ( 2022-06-30), p. 245-252
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 20, No. 2 ( 2022-06-30), p. 245-252
    Abstract: The attenuated porcine reproductive and respiratory syndrome virus (PRRSV) strain Hanvet1.vn was developed by Hanvet Pharmaceutical Co., Ltd. by inoculating the virulent strain 02HYon Marc-145 cells for 80 generations and used to produce PRRS vaccine. In this study, we published the results of sequencing, analyzing and comparing the genome of the attenuated PRRSV strain Hanvet1.vn compared with the original pathogenic strain 02HY. The genomes of strains Hanvet1.vn and 02HY have 8 reading frames, coding for 8 non-structural and structural proteins: NSP1a, NSP1b, GP2, GP3, GP4, GP5, MP, NP. After sequencing and translating into proteins, the gene sequence of each open reading frame (ORF) of strain Hanvet1.vn was compared with the sequence of pathogenic strain 02HY to find nucleotide and amino acid changes. The results showed that the Hanvet1.vn pathogenic strain genome (Genbank Accession KU842720) when compared with the pathogenic strain 02HY genome (Submission2490633) had89 nucleotide mutations that changed 51 amino acids in 7 ORFs and 7 proteins, respectively. Particularly, ORF6 encoding for the M protein is completely unchanged. The size of each reading frame is also exactly the same. It showed that there were no insertion and deletion (Indel) mutations in the ORFs of the attenuated strain after 80 generations of inoculation. There was a change in the genome that made the strain Hanvet1.vn become attenuated, but the gene encoding for the GP5 protein that induces the production of neutralizing antibodies only changed two nucleotides at position 471 (A- 〉 G), causing the TCA codon to turn into a TCG codon. This is a silent mutation and both codons code for the amino acid Serine (S). The second mutation at position 587 (A- 〉 T) causes Glutamine (Q) to transform into Leucine (L). However, this modification does not belong to the GP5 antigenic epitopes. In clonclusion, after 80 passages, despite changes occurred in genes of Hanvet1.vn strain for becoming an attenuated strain, the GP5 protein of the attenuated strain did not change its antigenic amino acids.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/16677
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 8
    Online Resource
    Online Resource
    Đặc điểm môi trường tầm tích tầng mặt ven biển huyện Hải Hậu để quy hoạch nuôi trồng thủy sản
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  VIETNAM JOURNAL OF EARTH SCIENCES Vol. 28, No. 2 ( 2018-03-08), p. 226-232
    Details
    In: VIETNAM JOURNAL OF EARTH SCIENCES, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 28, No. 2 ( 2018-03-08), p. 226-232
    Abstract: Assessment of subaerial sediment environment for aquaculture planning in Hai Hau coastal zone
    Type of Medium: Online Resource
    ISSN: 0866-7187 , 0866-7187
    URL: Article
    DOI: 10.15625/0866-7187/28/2/11665
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
    SSG: 6,25
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  • 9
    Online Resource
    Online Resource
    STUDY ON THE EFFECT OF CALCIUM-ALGINATE AND WHEY PROTEIN ON THE SURVIVAL RATE OF Bifidobacterium bifidum IN MAYONNAISE
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Vietnam Journal of Science and Technology Vol. 57, No. 3B ( 2019-11-12), p. 33-
    Details
    In: Vietnam Journal of Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 57, No. 3B ( 2019-11-12), p. 33-
    Abstract: ABSTRACT – QMFS 2019The functional food development by adding probiotic bacteria is getting a lot of concern. In this study, Bifidobacterium bifidum AS 1.1886 was encapsulated in calcium-alginate 2% w/v (C sample) or the mix of calcium-alginate 2% (w/v) and whey protein 1% (w/v) (CW sample) or calcium-alginate 2% (w/v) coated by whey protein 1% (w/v) (CcW sample) by extrusion method, and added to mayonnaise product. The pH changes, the survival rate of probiotic bacteria, and total yeast and mold count during storage, as well as the probiotic survival in simulated gastric medium, were evaluated. The result showed that the pH changes were not significantly different in all mayonnaise samples in this test. The viability of the free probiotic cell was significant decrease about 5.85 log CFU/g compared to 0.26 ÷ 1.14 log CFU/g in encapsulated cell samples after four weeks of storage. None of the free cells survived after six weeks of storage. The total yeast and mold count in samples related to the probiotic count, the viability of probiotic cells higher 6 log CFU/g might be controlling the growth of yeast and molds in mayonnaise. Whey protein has been shown to significantly improve the survival rate of B.bifidum and calcium-alginate coated by whey protein, indicating the most effective protection. The result showed that the application potential of encapsulated probiotic in mayonnaise product.
    Type of Medium: Online Resource
    ISSN: 2525-2518 , 2525-2518
    URL: Article
    DOI: 10.15625/2525-2518/57/3B/14090
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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  • 10
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    Online Resource
    H\(_{2}\)O\(_{2}\) production in 〈i〉 Lactobacillus 〈/i〉 strains isolated from the intestinal microbiome of healthy people
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2020
    In:  TAP CHI SINH HOC Vol. 42, No. 1 ( 2020-03-19)
    Details
    In: TAP CHI SINH HOC, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 42, No. 1 ( 2020-03-19)
    Abstract: Lactobacillus sp. in the digestive tract are capable of producing H2O2 to inhibit the growth of harmful bacteria and balance the gut microflora. In this study, we have isolated 115 strains of Lactobacillus spp. from stool samples of healthy people in Ha Noi. Of the 50 tested Lactobacillus strains, 9 strains were capable of producing H2O2, of which the Lac.VFE-14 strain produced highly H2O2 with a concentration of 2.183 mM, followed by Lac.VFE-08 strains (2.081 mM) and Lac.VFE-04 (2.067 mM). All three strains grew well in MRS medium supplemented with bile salts or adjusted to low pH value. With 0.3% of bile salt, the survival rates of these 3 strains were 99%, 95% and 97%, respectively. At pH 3.0, after 3 hours of cultivation, the survival rates of the three strains were 98.54%, 94.15% and 95.27%, respectively. In addition, each of the cell-free culture supernatants of these three strains that inhibit the growth of S. aureus ATCC-23235. The inhibition zone diameters of the three strains were 19.0±1.0 mm, 14.0±1.0 mm and 11.7±1.3 mm, respectively. The results of 16S rRNA gene analyses showed that Lac.VFE-14, Lac.VFE-08 and Lac.VFE-04 had high similarity scores with L. plantarum ZZU 23 (100%), L. rhamnosus JCM 1136 (99%) and L. plantarum S7 (98.65%), respectively. This study indicates that all three strains have the potential to be used as probiotics in the future.  
    Type of Medium: Online Resource
    ISSN: 0866-7160 , 0866-7160
    URL: Article
    DOI: 10.15625/0866-7160/v42n1.14508
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2020
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