http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/issue/feed Science and Technology Development Journal - Natural Sciences 2020-04-06T11:02:01+00:00 Phuc Van Pham pvphuc@vnuhcm.edu.vn Open Journal Systems http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/597 Petrographical, petrochemical characteristics of Ta Kou massif granitoids, Ham Thuan Nam, Binh Thuan 2020-04-06T11:02:01+00:00 http://stdjns.scienceandtechnology.com.vn/public/journals/2/article_597_cover_en_US.png Nguyen Thi Thu Thuy phamvanphuc2308@gmail.com Nguyen Kim Hoang nkhoang@hcmus.edu.vn <p>Ta Kou is an isometric shape with an area of ​​about 15 km<sup>2</sup>. Petrographical composition is mainly biotite-hornblende granodiorite; minors are altered light-colored fine-grained biotite granite. Mineral composition is mainly plagioclase 45<strong>–</strong>50, quartz 25, potassium feldspar 15<strong>–</strong>20, biotite 5<strong>–</strong>10, hornblende (5<strong>–</strong>7); secondary is pyroxen; Accessory minerals include zircon, apatite, orthit, muscovite and rare ore. In some places, near fault or high arch of massif, rocks have been altered by other magma, especially near faults due to post-magma activity including fine-grained biotite granite which caused strongly by alkalization such as increasing the content of potassium felspar (35<strong>–</strong>50%) and quartz 30; reducing plagioclase content (30<strong>–</strong>25%); amphibole -colored minerals is rare, and pyroxene is absent. Chemical composition of medium acid granodiorite SiO<sub>2</sub> 61.08<strong>–</strong>62.14 (61.85); total alkalinity (K<sub>2</sub>O+Na<sub>2</sub>O) 5,99<strong>–</strong>6,04 (6.00); ratio of alkaline K<sub>2</sub>O/Na<sub>2</sub>O: 0.74-0.77 (0.75 &lt;1). Characterized trace elements content of granodiorite: Rb and Ba are low but Sr is quite high; ratios Rb/Sr: 0.24; Ba/Sr 1.40, Ba/Rb: 5.85; K/Rb: 245.39; La/Yb: 10.33; Ce/Yb: 22.11; normal Eu anomalies. When influencing the post-magmatic activity, some granite is more acidific, the chemical composition of altered granite SiO<sub>2</sub> 72.27<strong>–</strong>74.07 (73.17); total alkalinity (K<sub>2</sub>O+Na<sub>2</sub>O): 7.48<strong>–</strong>7.96 (7.72); the ratio of alkaline &nbsp;K<sub>2</sub>O/Na<sub>2</sub>O: 1.60<strong>–</strong>1.69 (1.64&gt;1). Characterized trace elements content of altered granite: Ba and Sr are low but high Rb; ratios of Rb/Sr: 1.43; Ba/Sr: 3.06, Ba/Rb: 2.79; K/Rb: 218.05; La/Yb: 8.60 and Ce/Yb: 15.74; strong Eu anomalies.Ta Kou granitoids belong to the medium to high aluminum series, medium to high potassium alkaline series, negative Eu anomalies are from normal to strong, type of I- granite. Granitoid characterized subduction-related formation and altered, which may be due to the effects of later phase magmatic activity. Compared with granitoid formations in South Vietnam, Ta Kou massif granitoids belong to phase 2 of Định Quán complex.</p> <p>&nbsp;</p> 2020-04-04T00:00:00+00:00 ##submission.copyrightStatement## http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/690 Metal transporter encoding gene families in Fabaceae: III. The zinc-iron permease (ZIP) gene family 2020-04-06T11:02:00+00:00 http://stdjns.scienceandtechnology.com.vn/public/journals/2/article_690_cover_en_US.png Cao Phi Bằng phibang.cao@hvu.edu.vn <p>In plants, Zinc and Iron are transported through the membrane by proteins belonging to Zinc-Iron permease (ZIP: ZRT/IRT-like Protein). In this work, the ZIP gene families were identified in the genome of five legume species. The results demonstrated that the ZIPs were belonged to a multigeneic family in each species including soybean (28 genes), Medicago truncalata (16 genes), chickpea (7 genes), pigeon pea (12 genes), and Lotus japonicus (15 genes). Each gene contained from one to twelve introns. ZIP proteins possessed a conserved histidine-rich motif. Most of these proteins contained eight putative transmembrane domains and were predicted to be localized in plasma membranes. The phylogeny analysis showed that the legume ZIPs were classified into four main groups, each of which includes many subgroups. The group I contained the ZIP members of five examined plants. Moreover, the phylogeny showed gene gain events (expansion) in group I and gene loss events in other groups. The gene expansion in group I is likely to have arisen mainly from recent duplication events of ZIP genes in the examined legume plants, after specialization. The expression analysis showed that all of ZIP genes were expressed in all of the examined tissues in L. japonicus. The expression level of ZIP members was not similar in different tissues of the plant. Some ZIP genes were predominantly expressed in certain tissues for most of the legume species investigated.</p> 2020-04-04T00:00:00+00:00 ##submission.copyrightStatement## http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/829 Study on the vase life of Chyrsanthemum indicum cultivar Sakura cutting flower 2020-04-06T11:01:57+00:00 http://stdjns.scienceandtechnology.com.vn/public/journals/2/article_829_cover_en_US.png Thắng Thanh Trần trtthang@hcmus.edu.vn Triều Phương Hoàng hoangphuongtrieu@gmail.com Hương Thanh Trần trthuong@hcmus.edu.vn <p><em>Chrysanthemum indicum</em> cultivar Sakura is one of the daisy cultivars. It is beautiful, but the vase life of cutting flowers is very short. The decrease in flower quality during storage and transportation is a big problem in the flower export. In this study, the morphological, physiological, and biochemical changes during the vase life of cutting flowers were analyzed. The effects of plant growth regulators and sucrose at different concentrations on the vase life of cut flowers were investigated. The vase life of Sakura cutting flowers includes two stages: (1) the growing and blooming of flower, (2) senescence of cutting flowers. During the growing and blooming, the color of disk flowers changed from green to yellow, and the ray flowers continued to expand the dimension leading to an increase in the diameter of the head flower. The senescence of cutting flowers was initiated by the reduction of chlorophyll content in the leaf, which was located at the base. Then, the ray flowers were discolored. In the senescence stage, the respiration rate and the content of the abscisic acid of head flower increased continuously. In contrast, the water absorption, the content of starch, total sugar, salicylic acid, auxin, cytokinin, and gibberellin decreased strongly. The treatment of 10 g/L sucrose, 2 mg/L NAA, 5 mg/L BA, and 20 mg/L salicylic acid in 24 hours extended the vase life of Sakura cutting flowers and the diameter of the head flower.</p> <p>&nbsp;</p> 2020-04-04T02:30:35+00:00 ##submission.copyrightStatement## http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/834 Isolation and screening of Pseudomonas isolates enhance salinity tolerance of peanut (Arachis hypogaea L.) 2020-04-06T11:01:56+00:00 http://stdjns.scienceandtechnology.com.vn/public/journals/2/article_834_cover_en_US.png Thanh Nguyen Chu cnthanh14@gmail.com Tieng Van Nhut Pham nhuttiengkhtn@gmail.com Le Van Bui bvanle@hcmus.edu.vn Minh Thi Thanh Hoang httminh@hcmus.edu.vn <p>The application of plant growth-promoting rhizobacteria (PGPR) is one of the most promising alternative approaches to improve plant growth under salt stress. Among PGPR, <em>Pseudomonas</em> is a bacterial genus that possesses a variety of mechanisms for plant-growth-promoting and induction of biotic as well as abiotic stress tolerance. In this study, we screened three potential strains and tested the growth promotion of peanut (<em>Arachis hypogaea</em>) under saline conditions. All three isolates (strains) showed <em>in vitro</em> plant growth promoting traits such as the production of indoleacetic acid (IAA), phosphate solubilization, and nitrogen fixation.&nbsp; Moreover, the 3 isolates present gene encoding ACC deaminase, and an important enzyme can promote plant growth to ameliorate abiotic stresses. Peanut inoculated with the strain BT00P03 showed the increase in fresh shoot biomass in normal and saline stress conditions. Our results showed that the BT00P03 strain might be used as a biological agent for eco-friendly agricultural practices. This research is the first step to understand the microbe-plant interaction mechanism under stress and to apply these strains to agricultural practices in the future.</p> 2020-04-04T02:46:16+00:00 ##submission.copyrightStatement## http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/768 The Zooplankton composition and surface water quality in some watershed around the aquaculture areas at the Ben Tre province 2020-04-06T11:01:54+00:00 http://stdjns.scienceandtechnology.com.vn/public/journals/2/article_768_cover_en_US.png Lê Thị Hồng Vân hongvan2041996@gmail.com Trần Ngọc Diễm My tndmy@hcmus.edu.vn <p>The research was conducted in 3 districts: Binh Dai, Ba Tri and Thanh Phu in Ben Tre province in September 2017 (wet season) and April 2018 (dry season). The study recorded 63 taxa of zooplankton belong to 40 genera, 7 classes, and six groups: Protozoans, Rotifers, Cladocerans, Copepods, Ostracods and larvae (of shrimp and crab). Rotifers dominated the local zooplankton quantitatively, with 55,56% of the total organisms. Total zooplankton densities oscillated from 120 – 23 304 ind.m<sup>-3</sup> during the wet and dry season. The total zooplankton in the wet season is higher in the dry season. The result of the research showed that zooplanktons were affected by season and salinity. The water quality indices (pH, temperature, salinity, TDS, DO, NO<sub>3</sub><sup>-</sup>, NH<sub>4</sub><sup>+</sup>, PO<sub>4</sub><sup>3-</sup>) were under limitation to use for aquaculture activities, aquatic organism conservation, and daily living. The Shannon – Wiener index (H’) fluctuated from 0,51 to 2,02, the Simpson index fluctuated from 0,15 to 0,8, the Pielou index fluctuated from 0,23 to 0,94. The bioindex showed that the water bodies are polluted (from α, β – mesosaprobic level to polysaprobic level). Our results indicated that there was a difference between water environmental parameters and zooplankton communities among seasons and stations. Therefore, it is necessary to combine these two indicators for better accurate results in water quality assessment.</p> 2020-04-04T22:05:23+00:00 ##submission.copyrightStatement## http://stdjns.scienceandtechnology.com.vn/index.php/stdjns/article/view/718 The Investigating the red phenol absorption by multi-walled carbon nanotubes 2020-04-06T11:01:59+00:00 http://stdjns.scienceandtechnology.com.vn/public/journals/2/article_718_cover_en_US.png Huynh Anh Hoang phamvanphuc2308@gmail.com Huynh Quyen hquyen@hcmut.edu.vn <p>Since the end of the 20th century, nanomaterials such as carbon nanotubes (CNTs) have been considered as one of the greatest achievements in the field of material science. Nowadays, further research on CNTs is still being conducted to unfold the full potential of this material. Generally, CNTs production methods have been extensively studied, specifically on CNTs synthesis route via liquefied hydrocarbon gas in the presence of a catalyst. From the synthesized material, further investigation including characterization and investigation of this nano size system’s effects on the physics, chemical, mechanical rules applied to macroscopic (bulk materials) and microscopic systems (atoms, molecules). In this present work, we demonstrated the research results of the synthesis of nano-carbon materials from a liquefied hydrocarbon gas (Liquefied Petroleum Gas: LPG) and its application to red phenol absorption in the liquid phase. CNTs used in this study were synthesized by chemical vapor deposition (CVD) method with Fe /ℽ-Al2O3 as the catalyst. The research results demonstrated that CNTs synthesized from LPG in this work were reported to be multi-walled tubes (MWCNTs: Multi-Walled Carbon Nanotubes) with physical characteristics including average internal and external diameters were of 6 nm and 17 nm, respectively. The measured specific surface suggested by BET data was 200 m2/g. The experimental study of red phenol adsorption by MWCNTs showed that the adsorption process followed both Freundlich and Langmuir isotherm adsorption models with the maximum monolayer adsorption capacity of 47.2 mg/g. The research results again showed that it was possible to synthesize MWCNTs from hydrocarbon gas sources via the CVD method by utilizing catalysts. Additionally, red phenol absorption via such material had shown to follow both Freundlich and Langmuir isotherm model, which allow further characterization of this material using Raman, EDX, SEM, TEM, BET, in order to extend the library database on the characterization of the reported synthesized material.</p> 2020-04-04T02:19:38+00:00 ##submission.copyrightStatement##