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  • 2015-2019  (43)
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  • 2015-2019  (43)
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  • 1
    Online Resource
    Online Resource
    Effects of simulated microgravity on seed germination, growth, development and accumulated secondary compounds of Hibiscus sagittifolius Kurz. cultured in vitro
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2018
    In:  Vietnam Journal of Biotechnology Vol. 15, No. 1 ( 2018-04-20), p. 73-85
    Details
    In: Vietnam Journal of Biotechnology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 15, No. 1 ( 2018-04-20), p. 73-85
    Abstract: In the present study, Hibiscus sagittifolius Kurz. seeds were used as the plant materials for studying on the effects of simulated microgravity (on a 2D clinostat) on seed germination, shoot multiplication, growth, development and secondary metabolite accumulation. After surface sterilization, seeds were cultured on MS medium supplemeted with 30 g/l sucrose and 9 g/l agar in Petri dishes (9 seeds per dish, the seed to seed distance of 1.5 cm and kept in the same direction), and maintained in a Clinostat (2 rpm). The results showed that simulated microgravity inhibited the growth and development of Hibiscus sagittifolius roots with root length of 11.83 cm, fresh and dry weight of 58.28 and 5.23 mg, respectively but it made an increase in germination rate (87%) and accumulation of secondary metabolites (the total saponins content of 53.00 mg/g and the total coumarin content of 25.67 mg/g) after 3 weeks of culture. In addition, the simulated microgravity also resulted in positive shoot multiplication (shoot height of 3.07 cm, 6.33 nodes per shoot, 3.33 shoots per explant, and the fresh and dry weight of 401.33 and 37.00 mg, respectively), and growth and development of Hibiscus sagittifolius shoots (plant height of 12.17 cm with 5.67 leaves per shoot together with the average root length of 1.77 cm, and the fresh and dry weight of 419.00 and 36.00 mg) after 4 weeks of culture. The results from this study could be attributed to future perspectives in research on plant breeding and accumulation of secondary metabolites in medicinal plants.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/15/1/12322
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2018
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    Online Resource
  • 2
    Online Resource
    Online Resource
    The effects of intensities, lighting periods of red led and blue led on growth, development on in vitro chrysanthemum (Chrysanthemum morifolium Ramat. CV. “Jimba”)
    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. 295-304
    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. 295-304
    Abstract: In this study, the influence of different LED lighting intensities, different lighting periods of red LED and blue LED on growth, development and chlorophyll a and b synthesis on in vitro Chrysanthemum were presented. Shoot tips were inoculated and were put under 70% red LED: 30% blue LED lighting condition with different LED lighting intensities: 30, 45 and 60 µmol.m-2.s-1; different LED lighting periods: weekly intermittent lighting with red LED/blue LED (blue LED or red LED lighting for the first week), intermittent lighting with red LED/blue LED for each two weeks (blue LED or red LED lighting for the first two weeks). After 6 weeks of cultured, the results showed that LED lighting source with intensity 60 µmol.m-2.s-1 had the best stimulation on growth and development of Chrysanthemum; however, under intensity 45 µmol.m-2.s-1, chlorophyll a and b content still were the highest. In addition, weekly intermittent lighting with red LED and blue LED (blue LED was lighted at the first week) gave the best results on growth and development of Chrysanthemum. Thus, the most suitable LED lighting intensity for growth and development of in vitro Chrysanthemum was 60 µmol.m-2.s-1, and weekly intermittent lighting with red LED and blue LED (blue LED was lighted at the first week) will promote the growth and development of in vitro Chrysanthemum. The survival rates, growth and development of plants under 70% red LED: 30% blue LED and 50% red LED: 50% blue LED were higher than those of plants under Florescent, after 4 weeks of cultured in the greenhouse.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/14/2/9355
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2016
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Influence of zero gravity on germination, growth, development and phenotype variation in Impatiens balsamia
    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. 479-489
    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. 479-489
    Abstract: A general strategy for de novo breeding technique using zero gravity has been emerging in some countries with developed space systems including Russia, the United States of America, China and Japan. In 2011, the first Kibo-ABC programme - "Asian Seeds" - began. Seeds from plants collected in Vietnam, Indonesia, Malaysia, and Thailand including Impatiens balsamia, Antirrhinum majus, and Salvia splendens Ker-Gawl. seed collected by Tay Nguyen Institute for Scientific Research staff were transported to Kibo and then returned to the Earth after a few months. In the present study, germination, growth and development and phenotypic variation of the Impatiens balsamia “zero gravity seeds” were compared with seeds that were not transported into space. Five months after the sowing date, the results indicated that the germination rate of the zero gravity seeds were 2 times higher than the control (22.9% and 9%, respectively). There was no significant difference in some growth and development parameters including plant height, number of branches per plant, leaf diameter, stem diameter and chlorophyll content between the zero gravity seeds and the control. Interestingly, Impatiens balsamia zero gravity seeds derived plants bloomed 16 - 23 days earlier than the control. A few “zero gravity seed” seedlings, however, showed not only lower growth and development abilities than those of the control but also some phenotypic variations such as loss of apex, under-developed apex, unusually large leaf, loss of growth and development and axillary bud formation on internodes, or double petals. This result will be an important prerequisite for the study of plant breeding in space technology - a new way of breeding industry in Vietnam.
    Type of Medium: Online Resource
    ISSN: 1811-4989 , 1811-4989
    URL: Article
    DOI: 10.15625/1811-4989/14/3/9862
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2016
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Theoretical and experimental studies on the influence of Cr incorporation on the structural, optical, and magnetic properties of Bi0.5K0.5TiO3 materials
    Springer Science and Business Media LLC ; 2018
    In:  Journal of Sol-Gel Science and Technology Vol. 87, No. 3 ( 2018-9), p. 528-536
    Details
    In: Journal of Sol-Gel Science and Technology, Springer Science and Business Media LLC, Vol. 87, No. 3 ( 2018-9), p. 528-536
    Type of Medium: Online Resource
    ISSN: 0928-0707 , 1573-4846
    URL: Article
    DOI: 10.1007/s10971-018-4764-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2018
    detail.hit.zdb_id: 1472726-2
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  • 5
    Online Resource
    Online Resource
    Occurrence features of Rip current at Ha My (Dien Ban district) and Tam Thanh (Tam Ky city) beaches, Quang Nam province
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 19, No. 4A ( 2019-11-08), p. 43-53
    Details
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 4A ( 2019-11-08), p. 43-53
    Abstract: Rip current is a relatively strong, narrow current flowing outward from the beach through the surf zone and presenting a hazard to swimmers. This paper presents some occurrence features of Rip current at main swimming beaches in Quang Nam province, Central Vietnam. Study results show that most of swimming beaches along Quang Nam province coast are directly opposed to open sea and strongly affected by swell. Therefore, Rip current system can occur at any time in the year with large dimension and intensity. During Northeast monsoon (November to March) beach morphology is considerably changed by strong wave action, thus the strongest rip current is formed. However, in this period careful swimmers can easily identify where that rip current occurs along the beach. During the transition period from Northeast monsoon to Southwest monsoon (April to May) wave energy is reduced, thus Rip current intensity is also decreased. During Southwest monsoon (June to August) wave energy is not strong and beach is accreted, therefore some Rip currents remain at reasonable morphology places along the beach. During the transition period from Southwest monsoon to Northeast monsoon (September to October) Rip current can occur at deep places along the beach with characteristics of narrow dimension, thus causing more danger to swimmer. Especially, dangerous rip current is caused by swell which comes from active region of tropical cyclone in open sea. In this period wave field in the nearshore region is not rough, thus most of swimmers are not cautious when swimming at dangerous rip current places.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/19/4A/14587
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Facile synthesis of multifunctional Ag/Fe3O4-CS nanocomposites for antibacterial and hyperthermic applications
    Elsevier BV ; 2015
    In:  Current Applied Physics Vol. 15, No. 11 ( 2015-11), p. 1482-1487
    Details
    In: Current Applied Physics, Elsevier BV, Vol. 15, No. 11 ( 2015-11), p. 1482-1487
    Type of Medium: Online Resource
    ISSN: 1567-1739
    URL: Article
    DOI: 10.1016/j.cap.2015.08.016
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2015
    detail.hit.zdb_id: 2039065-8
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  • 7
    Online Resource
    Online Resource
    Improving accuracy of altimeter-derived marine gravity anomalies in the East Vietnam Sea deep-basin and adjacent area
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 19, No. 3B ( 2019-10-21), p. 43-53
    Details
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 3B ( 2019-10-21), p. 43-53
    Abstract: In recent years, the satellite altimeter technology allows enhancing the marine investigation in many areas. Up to now, many scientific studies have attempted to improve the accuracy and resolution of altimeter-derived gravity anomalies and have produced a gravity grid with interval of 1’×1’ for most oceans all over the world. However, these gravity anomalies are not very highly accurate and have a large difference compared to shipboard gravity anomalies, especially in the coastal and islands areas. The purpose of this article is to improve the accuracy of altimeter-derived marine gravity anomalies for geological structure research in the East Vietnam Sea deep-basin and adjacent areas. The least squares collocation method is used to correct the altimeter-derived marine gravity data based on the shipboard gravity data in order to improve the accuracy of marine gravity anomalies. In this article, the altimeter-derived marine gravity anomalies are taken from Sandwell, D. T., et al., (V24.1) and the shipboard gravity anomalies are from the survey projects between Vietnam, Russia and other countries. The mean-squared error when comparing both data is about 9,358 mGal. After correcting by collocation method, the error was reduced to 3,208 mGal (for the altimeter data coinciding with shipboard track). Also, in this article, the achieved results show the efficiency and actuality of the corrected-altimeter-derived marine gravity anomalies for more detailed researches of geological structures. Especially, it is more meaningful in the remote or sparsely surveyed regions.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/19/3B/14497
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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  • 8
    Online Resource
    Online Resource
    PRESENT-DAY STRESS FIELD AND RELATIVE DISPLACEMENT TENDENCY OF THE EARTH'S CRUST IN THE PARACEL ISLANDS AND ADJACENT AREA
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2019
    In:  Tạp chí Khoa học và Công nghệ biển Vol. 18, No. 4 ( 2019-03-15), p. 460-474
    Details
    In: Tạp chí Khoa học và Công nghệ biển, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 18, No. 4 ( 2019-03-15), p. 460-474
    Abstract: Present-day stress filed in the Hoang Sa archipelago and adjacent areas is determined through the earthquake’s focal mechanism parameters that have been recorded during a time period of more than 100 years. The geometric parameters of the faults (such as the location, strike and dip angles as well as depth, length…) are determined by satellite-derived gravity, seismic data and stress fields. In this study, predictive determination of the magnitude and tendency of the relative displacement of the Earth’s crust is carried out by calculating and assessing the relationship between the stress fields and fault’s geometric parameters. On the basis of the Earth’s crust relative displacement, the geodynamic mechanism of the Hoang Sa archipelago and adjacent areas through the different geological periods can be rebuilt. Magnitude and tendency of the relative displacement of the Earth’s crust are represented by the color spectrum and the vector’s magnitude. Although the displacement appears in the whole region, its intensities are different in particular areas that have the faults systems with different grades.
    Type of Medium: Online Resource
    ISSN: 1859-3097 , 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/18/4/13665
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2019
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    Online Resource
  • 9
    Online Resource
    Online Resource
    Improving Accuracy of Altimeter-derived Marine Gravity Anomalies for Geological Structure Research in the Vietnam South-Central Continental Shelf and Adjacent Areas
    Pleiades Publishing Ltd ; 2019
    In:  Russian Journal of Pacific Geology Vol. 13, No. 4 ( 2019-07), p. 364-374
    Details
    In: Russian Journal of Pacific Geology, Pleiades Publishing Ltd, Vol. 13, No. 4 ( 2019-07), p. 364-374
    Type of Medium: Online Resource
    ISSN: 1819-7140 , 1819-7159
    URL: Article
    DOI: 10.1134/S181971401904002X
    Language: English
    Publisher: Pleiades Publishing Ltd
    Publication Date: 2019
    detail.hit.zdb_id: 2391890-1
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  • 10
    Online Resource
    Online Resource
    Study on DNA damages induced by UV radiation
    Vietnam Atomic Energy Institute ; 2015
    In:  Nuclear Science and Technology Vol. 5, No. 4 ( 2015-12-30), p. 16-22
    Details
    In: Nuclear Science and Technology, Vietnam Atomic Energy Institute, Vol. 5, No. 4 ( 2015-12-30), p. 16-22
    Abstract: DNA damages in Escherichia coli (E. coli) exposed to UV radiation have been investigated. After 30 min of exposure to UV radiation of 5 mJ/cm2, the growth of E. coli in LB broth medium was about only 10% in compared with non-irradiated one. This results suggested that the UV radiation caused the damages for E. coli genome resulted in reduction in its growth and survival, and those lesions can be somewhat recovered. For both solutions of plasmid DNAs and E. coli cells containing plasmid DNA, this dose also caused the breakages on single and double strands of DNA, shifted the morphology of DNA plasmid from supercoiled to circular and linear forms. The formation of pyrimidine dimers upon UV radiation significantly reduced when the DNA was irradiated in the presence of Ganoderma lucidum extract. Thus, studies on UV-induced DNA damage at molecular level are very essential to determine the UV radiation doses corresponding to the DNA damages, especially for creation and selection of useful radiation-induced mutants, as well as elucidation the protective effects of the specific compounds against UV light.
    Type of Medium: Online Resource
    ISSN: 1810-5408
    URL: Issue
    URL: Article
    DOI: 10.53747/jnst.v5i4
    DOI: 10.53747/jnst.v5i4.202
    Language: Unknown
    Publisher: Vietnam Atomic Energy Institute
    Publication Date: 2015
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