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Vegetable structure in the Bay Sand Dune of Mui Ne, Phan Thiet city, Binh Thuan province 平顺省潘铁市梅奈湾沙丘的蔬菜结构
Journal of Science Natural Science Pub Date : 2021-11-01 DOI: 10.18173/2354-1059.2021-0067
Thao Truong Thi Hieu, Hoang Ho Dac Thai, Hung Le Thai, Lien Nguyen Thi Hong
{"title":"Vegetable structure in the Bay Sand Dune of Mui Ne, Phan Thiet city, Binh Thuan province","authors":"Thao Truong Thi Hieu, Hoang Ho Dac Thai, Hung Le Thai, Lien Nguyen Thi Hong","doi":"10.18173/2354-1059.2021-0067","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0067","url":null,"abstract":"There were three vegetation types in blowing sand dunes of Mui Ne, Phan Thiet city, Binh Thuan province; native sand binding grasses type, mix species of native grasses and low shrub type and evergreen trees biome in coastal sand dune type. Group of dominant typical species were identified in each vegetation type in which three significant canopy layers were confirmed with evergreen trees biome in coastal sand dune type. The similarity among different vegetation types was evaluated, Sorenson’s index (S) showed that similarity of species in the vegetation types native sand binding grasses and mix species of natuve grasses and low shrub is 0.61, Shannon index (H’) for all three types is low but the highest come from evergreen trees biome in coastal sand dune type (H’ = 0.17 for trees and 0.06 for vines and shrub species. Results and lessons learned from this study are referred to conservation and ecological restoration activities.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82828856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Screening of potential cassava varieties for good tolerance under waterlogging conditions 耐涝木薯潜在品种筛选
Journal of Science Natural Science Pub Date : 2021-11-01 DOI: 10.18173/2354-1059.2021-0068
Sengsoulichan Dethvongsa, Vu Nguyen Anh, Van Tran Khanh
{"title":"Screening of potential cassava varieties for good tolerance under waterlogging conditions","authors":"Sengsoulichan Dethvongsa, Vu Nguyen Anh, Van Tran Khanh","doi":"10.18173/2354-1059.2021-0068","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0068","url":null,"abstract":"The experiment screening of potential cassava varieties for good tolerance to artificial waterlogging was evaluated on 17 varieties of cassava in vitro at 3 months of age after planting in potting soil for 12 days through physiological parameters: number of leavesplant, number of yellow leaves, number of wilted plants and chlorophyll content. The results showed that cassava varieties had different tolerance to waterlogging: some varieties showed physiological symptoms only after 3 days of growth on waterlogging conditions such as the number of leavesplant decreasing to 83.93 %. 93.75 %, 93.81 %, 95.88 % and 96.48 % in cassava varieties C86, C23, Hanoi3, C84 and C31, respectively. After 6 days of waterlogging, the percentage of yellow leaves in some varieties of cassava had been increased, attained up to 40 % of the total leavesplant turned yellow such as C71 (44.68 %) or C13 (53.12 %) varieties while other cassava varieties wilted and die 100 % such as Hanoi3, C10, C13, C34, C42, C66, C71, C84 and C86; along with the symtoms of morphological and growth of cassava varieties on waterlogging conditions, the total of chlorophyll content also decreased. After 9 days of waterlogging, only C60 variety remained chlorophyll content with 77.38 % but in other cassava varieties, the chlorophyll content was not more than 50 %. We founded that the longer the duration of waterlogging, the more tolerant response of the studied cassava varieties was revealed. After 12 days of experiment, we initially determined that the C60 variety was the best flood tolerance among the 17 studied varieties and this was a good source of materials on selecting the variety of flood tolerant cassava.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79024082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
IN VITRO ANTIOXIDANT ACTIVITY OF C-PHYCOCYANIN PURIFIED FROM Spirulina platensis DRY BIOMASS 从螺旋藻干生物量中纯化的c -藻蓝蛋白体外抗氧化活性研究
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0051
Dao Pham Thi Bich, Ha Nguyen Thi Hoai, Cong Vu Thanh, Hoan Phung Van, Binh Tran Quoc, L. Nguyen Ngoc
{"title":"IN VITRO ANTIOXIDANT ACTIVITY OF C-PHYCOCYANIN PURIFIED FROM Spirulina platensis DRY BIOMASS","authors":"Dao Pham Thi Bich, Ha Nguyen Thi Hoai, Cong Vu Thanh, Hoan Phung Van, Binh Tran Quoc, L. Nguyen Ngoc","doi":"10.18173/2354-1059.2021-0051","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0051","url":null,"abstract":"C-phycocyanin (C-PC) was a phycobiliprotein found exclusively in cyanobacteria as Spirulina and exhibited a variety of pharmacological properties, which were not yet studied for any purpose in commercial applications in the pharmaceutical and cosmetic industry in Vietnam. At present, there are no other sources of natural phycocyanin than Spirulina, it is the sole efficient source of natural phycocyanin production under photoautotrophic conditions. The present research was conducted to determine an efficient extraction method from C-PC from Spirulina platensis dry biomass. Antioxidant activity of purified C-PC was investigated. Extractions were carried out using distilled water and Na-phosphate buffer pH 7.0 as solvents and freezethaw and ultrasonication techniques were applied to optimize the extraction process. Extraction using the freezethaw method proved to be the most efficient method. Phycocyanin purification from crude extracts was carried out by a combination of methods such as ammonium sulfate (NH4)2SO4 65% precipitation, dialysis filter, and Sephadex G-100 gel filtration chromatography, to give 121.63 ± 0.03 mgg C-PC content and 3.52 ± 0.04 purity. Antioxidant activity in vitro was determined by nitric oxide (NO) scavenging activity, percentage inhibition of NO by the C-PC in concentration 10 μgmL to 100 μgmL which significantly scavenged 55.89% to 91.54% of NO radicals, respectively. They exhibited strong NO radical scavenging capacity, the C-PC and vitamin C were able to reduce the stable NO radical to 50% reduction with EC50 of 4.53 and 3.66 µgmL. Research results showed that S. platenis dry biomass provided by Dalitra was potential for obtaining C-phycocyanin (12.16% of dry biomass) and it was evaluated as an antioxidant in vitro able to scavenge nitric oxide. C-PC (12.16% of dry biomass) and was evaluated as an antioxidant in vitro able to scavenge nitric oxide.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"512 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78144379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
THE STUDY IN DIFFUSION MECHANISM BY VORONOI POLYHEDRON IN SODIUM TETRA-SILICATE MELT voronoi多面体在四硅酸钠熔体中的扩散机理研究
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0046
Lich Duong Thi, San Luyen Thi, Yen Nguyen Hai
{"title":"THE STUDY IN DIFFUSION MECHANISM BY VORONOI POLYHEDRON IN SODIUM TETRA-SILICATE MELT","authors":"Lich Duong Thi, San Luyen Thi, Yen Nguyen Hai","doi":"10.18173/2354-1059.2021-0046","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0046","url":null,"abstract":"Molecular dynamic simulation is carried out for Sodium tetra-silicate (NS4) melt at 1873 K and pressure of 0.1 MPa. The diffusion mechanism of Na atoms is investigated in terms of Voronoi polyhedron around network former and displacement of Na atoms between them. The simulation shows that Na atoms are not uniformly distributed through polyhedrons, but they mainly gather in nonbridging oxygen (NBO) and free oxygen (FO) polyhedrons. More than 75.22% of total Na atoms are place in NBO polyhedrons, although the number of NBO polyhedrons is only 22.27%. The two motion types give mainly contribution to Na diffusion: hopping of isolated Na atom or collective displacement. During 150 ps, the system comprises two separate regions: Na-poor regions formed by Si-O subnets and Na-rich regions formed by O2 clusters. The two regions have strongly different chemical composition, the density of Na atoms as well as motion type of Na atoms.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79953967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A NOTE ON GENERALIZED RAINBOW CONNECTION OF CONNECTED GRAPHS AND THEIR NUMBER OF EDGES 关于连通图的广义彩虹连接及其边数的一个注记
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0041
Anh Nguyen Thi Thuy, Duyen Le Thi
{"title":"A NOTE ON GENERALIZED RAINBOW CONNECTION OF CONNECTED GRAPHS AND THEIR NUMBER OF EDGES","authors":"Anh Nguyen Thi Thuy, Duyen Le Thi","doi":"10.18173/2354-1059.2021-0041","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0041","url":null,"abstract":"Let l ≥ 1, k ≥ 1 be two integers. Given an edge-coloured connected graph G. A path P in the graph G is called l-rainbow path if each subpath of length at most l + 1 is rainbow. The graph G is called (k, l)-rainbow connected if any two vertices in G are connected by at least k pairwise internally vertex-disjoint l-rainbow paths. The smallest number of colours needed in order to make G (k, l)-rainbow connected is called the (k, l)-rainbow connection number of G and denoted by rck,l(G). In this paper, we first focus to improve the upper bound of the (1, l)-rainbow connection number depending on the size of connected graphs. Using this result, we characterize all connected graphs having the large (1, 2)-rainbow connection number. Moreover, we also determine the (1, l)-rainbow connection number in a connected graph G containing a sequence of cut-edges.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72799415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
THERMODYNAMIC PROPERTY OF ALLOY FCC-AuCuLi AT ZERO PRESSURE 零压下FCC-AuCuLi合金的热力学性质
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0048
Hoc Nguyen Quang, Hien Nguyen Duc
{"title":"THERMODYNAMIC PROPERTY OF ALLOY FCC-AuCuLi AT ZERO PRESSURE","authors":"Hoc Nguyen Quang, Hien Nguyen Duc","doi":"10.18173/2354-1059.2021-0048","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0048","url":null,"abstract":"We briefly present the thermodynamic theory of FCC ternary substitutional and interstitial alloy at zero pressure derived by the statistical moment method and apply this theory to alloy AuCuLi. The thermodynamic properties of Au, AuCu and AuLi are specific cases for that of AuCuLi. We compare the thermodynamic properties of alloys AuCuSi and AuCuLi. Our calculated results of thermodynamic quantities for AuCuLi predict and orient experimental results in the future.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73671497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
STABILITY OF A MATHEMATICAL MODEL DESCRIBING THE COVID-19 PANDEMIC IN TERMS OF THE ENVIRONMENT, SOCIAL DISTANCING AND REINFECTION 从环境、社交距离和再感染的角度描述COVID-19大流行的数学模型的稳定性
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0042
Nhu Luong Ngoc, Huyen Lai Thi Ngoc, Giang Vu Thi Huong, Hang Pham Thi
{"title":"STABILITY OF A MATHEMATICAL MODEL DESCRIBING THE COVID-19 PANDEMIC IN TERMS OF THE ENVIRONMENT, SOCIAL DISTANCING AND REINFECTION","authors":"Nhu Luong Ngoc, Huyen Lai Thi Ngoc, Giang Vu Thi Huong, Hang Pham Thi","doi":"10.18173/2354-1059.2021-0042","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0042","url":null,"abstract":"In this paper, we propose and study the stability of a mathematical model for the Covid-19 pandemic incorporating the environment, social distancing and reinfection. A numerical example is carried out to consider the obtained results.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75127386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
AN IMPROVED DIJKSTRA ALGORITHM TO FIND MINIMUM TIME PATHS FOR BUS USERS IN HANOI 一种改进的dijkstra算法寻找河内市公交用户的最小时间路径
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0049
Giang Vu Thai, Ngan Nguyen Thi Kim, Hoang Nguyen Ba, Duc Bui Minh
{"title":"AN IMPROVED DIJKSTRA ALGORITHM TO FIND MINIMUM TIME PATHS FOR BUS USERS IN HANOI","authors":"Giang Vu Thai, Ngan Nguyen Thi Kim, Hoang Nguyen Ba, Duc Bui Minh","doi":"10.18173/2354-1059.2021-0049","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0049","url":null,"abstract":"In Hanoi, many roads are congested during rush hour. When going through congested roads, the movement of vehicles is very slow. As a result, traveling over a short and congested road may take more time than traveling over a longer and uncongested road. Therefore, in this paper, we study the problem of finding optimal bus routes that take less time, considering the traffic jams. We extend Dijkstra's algorithm to compute waiting time at bus stations and traveling time of buses. The experimental results show that our algorithm is suitable.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"104 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87794359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
EQUILIBRIUM VACANCY CONCENTRATION AND THERMODYNAMIC QUANTITIES OF FCC DEFECTIVE ALLOYS AuCuSi AND PtCuSi UNDER PRESSURE AND TEMPERATURE FCC缺陷合金AuCuSi和PtCuSi在压力和温度下的平衡空位浓度和热力学量
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0045
V. Le Hong, Hoc Nguyen Quang
{"title":"EQUILIBRIUM VACANCY CONCENTRATION AND THERMODYNAMIC QUANTITIES OF FCC DEFECTIVE ALLOYS AuCuSi AND PtCuSi UNDER PRESSURE AND TEMPERATURE","authors":"V. Le Hong, Hoc Nguyen Quang","doi":"10.18173/2354-1059.2021-0045","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0045","url":null,"abstract":"We present the analytic expressions of the cohesive energy, the alloy parameters, the equation of state, the mean nearest neighbor distance, the Helmholtz free energy, equilibrium vacancy concentration, and thermodynamic quantities such as the isothermal compressibility, the thermal expansion coefficient, the heat capacities at constant volume and constant pressure for facecentered cubic (FCC) defective ternary substitutional and interstitial alloy ABC derived by the statistical moment method (SMM). The obtained thermodynamic quantities depend on temperature, pressure, the concentration of substitutional atoms, the concentration of interstitial atoms, and equilibrium vacancy concentration. Thermodynamic quantities of FCC defective metal A, FCC defective substitutional alloy AB, and FCC defective interstitial alloy AC are specific cases for thermodynamic quantities of FCC defective ternary substitutional and interstitial alloy ABC. The theoretical results are calculated numerically to alloys AuCuSi and PtCuSi. Our calculated results of thermal expansion coefficient and heat capacities at constant pressure for main metals Au, Pt are in good agreement with experimental data. Our other calculated results for thermodynamic quantities of alloys AuCuSi and PtCuSi at different temperatures, pressure, the concentration of substitutional atoms, and concentrations of interstitial atoms orient and predict new experimental data in the future.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82014786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MAPPING MULTI-SCALED LANDSCAPE TYPOLOGY OF LANG SON PROVINCE 谅山省多尺度景观类型学制图
Journal of Science Natural Science Pub Date : 2021-10-01 DOI: 10.18173/2354-1059.2021-0061
Dung Bui Thi Thanh
{"title":"MAPPING MULTI-SCALED LANDSCAPE TYPOLOGY OF LANG SON PROVINCE","authors":"Dung Bui Thi Thanh","doi":"10.18173/2354-1059.2021-0061","DOIUrl":"https://doi.org/10.18173/2354-1059.2021-0061","url":null,"abstract":"The landscape of a territory is generated by natural components, and it is also influenced by human activities. The complexity of factors making up landscape and the relationship between them with humans has created a diverse and complex differentiation of landscape in Lang Son province. Three factors reflecting typical characteristics of Lang Son landscape: Digital Elevation Model (DEM), soil, and land cover have been selected in this study. The concept of multiscaled landscape classification based on the European Landscape Convention (ELC) is applied for combining the holistic with parametric approaches and combining typological with multi-scaled landscape classifications. A number of possible combinations between 9 land cover variables, 9 soil combination variables, and 5 topographic variables have yielded 40 landscape units for Lang Son province. The obtained results are basic documents for contributing to modern and practical landscape research on the one hand, and to territory planning for sustainable development of Lang Son on the other hand.","PeriodicalId":17007,"journal":{"name":"Journal of Science Natural Science","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91122918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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