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Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion Zn (II)对CdTe量子点光学性质的影响及其对铅离子的光致发光响应
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-11-28 DOI: 10.25073/2588-1140/vnunst.5286
N. Nhan, Vu Anh Duc, Mai Xuân Dũng, Hoàng Quang Bắc
{"title":"Effects of Zn (II) on the Optical Properties of CdTe Quantum Dots and Their Photoluminescence Response to Lead Ion","authors":"N. Nhan, Vu Anh Duc, Mai Xuân Dũng, Hoàng Quang Bắc","doi":"10.25073/2588-1140/vnunst.5286","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5286","url":null,"abstract":"Water-soluble CdTe quantum dots (QDs) have been utilized as photoluminescence probes for the detection of metal ions such as Pb2+, Hg2+, Cd2+, etc. We initially developed highly photoluminescence (PL) Zn-doped CdTe for toxic ions detection. A study on the changes of optical properties of Zn-doped CdTe and CdTe QDs when exposed to Pb2+ suggested that Pb2+ could act as a surface passivating agent to reduce Te2- dangling bonds while Zn2+ dopant stabilizes the QDs surface against ambient oxidation. The results demonstrated herein provide useful  understandings of the interactions between water-soluble QDs and metal ions. These results suggest further applications of QDs in sensing metal ions.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87108993","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
Primulina jingxiensis, a New Record and Confirmation of Loxostigma dongxingensis for the Flora of Vietnam 越南植物区系东兴loxo柱头新记录及确认
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-11-28 DOI: 10.25073/2588-1140/vnunst.5089
N. T. Uyen, N. Thanh, W. Fang, D. Truong
{"title":"Primulina jingxiensis, a New Record and Confirmation of Loxostigma dongxingensis for the Flora of Vietnam","authors":"N. T. Uyen, N. Thanh, W. Fang, D. Truong","doi":"10.25073/2588-1140/vnunst.5089","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5089","url":null,"abstract":"We here report Primulina jingxiensis (Yan Liu, W. B. Xu, H. S. Gao) W. B. Xu, K. F. Chung as a new record and confirmed the occurrence of Loxostigma dongxingensis (Chun ex K. Y. Pan) Mich. Möller, H. Atkins for the flora of Vietnam which have been still known endemically to southern China from the previous treatments. Detailed morphological description as Herbs perennial, stemless. Leaves basal, carnose, blades obovate or elliptic to suborbicular, densely villous, thickened, papery when dry, base attenuate to cuneate, apex obtuse to subrounded, margin subentire, lateral veins 2 or 3, inconspicuous. Cymes lax, axillary, 2-5 cymes, 2-4-branched, each 1-3-flowered: bracts 2, opposite, margin entire, pubescent. In addition to the description as color illustrations together with information on distribution, habitat, phenology, and taxonomic notes of these two species are also given.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90979740","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
Research on Species Composition of Terrestrial Molluscs (Mollusca: Gastropoda) in Hoa Binh Province 和平省陆生软体动物(软体动物:腹足目)种类组成的研究
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-11-27 DOI: 10.25073/2588-1140/vnunst.5310
D. Sang
{"title":"Research on Species Composition of Terrestrial Molluscs (Mollusca: Gastropoda) in Hoa Binh Province","authors":"D. Sang","doi":"10.25073/2588-1140/vnunst.5310","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5310","url":null,"abstract":"Hoa Binh, situated in one of the Vietnam’s biodiversity areas, has four nature reserves (Ngoc Son-Ngo Luong, Hang Kia-Pa Co, Phu Canh, and Thuong Tien nature reserves), and also shares a part of Cuc Phương and Ba Vi National Parks, as well as having many different types of habitats. However, information on the terrestrial molluscs’ biodiversity is limited. This study provides an up-to-date checklist of terrestrial molluscs species found on five habitats in Hoa Binh Province. A total of 104 species representing 60 genera and 21 families is enumerated based on systematic field surveys of 49 sampling plots. Eight of these were new records for Hoa Binh Province: Dicharax fraterculus, Rhaphaulus tonkinensis, Tortaxis pilsbryi, Deroceras laeve, Parmarion martensi, Entadella concave, Meghimatium bilineatum, and Meghimatium pictum. Forests over limestone and isolated hills in Hoa Binh Province are rich in terrestrial molluscs. In the study area, several genera (Dicharax, Cyclophorus, Diplommatina, Pupina, Oospira and Haploptychius) are restricted to limestone mountains.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"56 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81424036","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
Synthesis and Structural Characterization of Picolinoyl (4-ethylthiosemicarbazide) and its New Heteroleptic Cu(II) Complex Picolinoyl(4-乙基硫代氨基脲)及其新型杂电性Cu(II)配合物的合成与结构表征
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-11-24 DOI: 10.25073/2588-1140/vnunst.5342
Nguyen Hung Huy, N. Huy, T. T. Nguyet, Pham Chien Thang
{"title":"Synthesis and Structural Characterization of Picolinoyl (4-ethylthiosemicarbazide) and its New Heteroleptic Cu(II) Complex","authors":"Nguyen Hung Huy, N. Huy, T. T. Nguyet, Pham Chien Thang","doi":"10.25073/2588-1140/vnunst.5342","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5342","url":null,"abstract":"The ligand picolinoyl(4-ethylthiosemicarbazide) HL was synthesized by the reaction of picolinohydrazide and ethyl isothiocyanate in absolute ethanol. The structure of HL was characterized by spectroscopic methods such as IR, 1H, and 13C NMR spectroscopy. One-pot reaction of CuCl2 and equimolar amounts of HL and o-phenanthroline in CH2Cl2/MeOH mixture with the presence of a supporting base like pyridine gave rise to a new heteroleptic cationic Cu(II) complex with the composition of [Cu(L)(o-phen)]+. Crystalline PF6– salt was obtained after workup with (n-Bu4N)(PF6) and single-crystal structure of the complex was determined. The spectroscopic data and X-ray crystallography demonstrated that the Cu(II) ion is five-coordinate with the coordination sphere consisted of (S, N1, Npyridine) and (N, N) donor sets belonging to the singly deprotonated ligand {L–} and o-phenanthroline, respectively.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89796840","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
Cloning, Expression, Re-folding, and Purification of Protein Flic (salmonella Enteritidis) with Deletion of Amino Acids 220-320 氨基酸缺失蛋白片段(肠炎沙门氏菌)的克隆、表达、重折叠和纯化
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-10-25 DOI: 10.25073/2588-1140/vnunst.4966
N. Anh, Trần Huỳnh Bảo Châu, Nguyen Phuoc Khai Hoan, T. Hiếu
{"title":"Cloning, Expression, Re-folding, and Purification of Protein Flic (salmonella Enteritidis) with Deletion of Amino Acids 220-320","authors":"N. Anh, Trần Huỳnh Bảo Châu, Nguyen Phuoc Khai Hoan, T. Hiếu","doi":"10.25073/2588-1140/vnunst.4966","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.4966","url":null,"abstract":"In order to develop high-performance subunit vaccines, many studies are currently aiming at the development of immunoadjuvants. Flagellin protein (FliC) contained in the Salmonella’s filament is one of the potential candidates for this purpose. However, the high antigenic property of FliC has made it difficult to apply for many vaccines.  A variant with the deletion of amino acids from 220 to 320 of flagellin has been proven to have an adjuvant effect with lower immunogenicity. In this present study, we cloned and expressed FliCD220-320 recombinant in Escherichia coli system. The expression of FliCΔ220-320 was induced by IPTG and confirmed by SDS-PAGE and Western Blot probed with 6xHis tag antibody. Results showed that most of the expressed protein is insoluble. The targeted protein was then solubilized, re-folded and purified by affinity chromatography method with the purity of 80 %. With these results, we successfully expressed FliCD220-320 recombinant protein and this is a source for the evaluation and development of immune adjuvants.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82411539","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
Species Composition and Utilization Values of Oil Plants in Xuan Nha Special-use Forest, Son La Provine 孙拉省宣芽特用林油料植物种类组成及利用价值
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-10-19 DOI: 10.25073/2588-1140/vnunst.5307
V. Lien, N. T. Cuong, D. T. Hoa
{"title":"Species Composition and Utilization Values of Oil Plants in Xuan Nha Special-use Forest, Son La Provine","authors":"V. Lien, N. T. Cuong, D. T. Hoa","doi":"10.25073/2588-1140/vnunst.5307","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5307","url":null,"abstract":"This study was conducted to assess the resources of oil plants in Xuan Nha special-use forest, Son La province. The survey period was conducted from July 2018 to June 2021. The results showed that there were 317 species, 196 genera of 62 families belonging to Pinophyta and Magnoliophyta. In addition to the value for essential oils, many species had other values such as 256 medicinal species, 105 edible species, 66 timber species, 35 bonsai species, 20 wine additive  species, 9 species used for animal feeds, 7 dye-containing species and 3 poisonous species. The spectrum of life forms of identified species included: SB = 63.41Ph + 11.99 Th + 11.04Cr + 7.57Hm + 5.99 Ch. We have identified 24 species of plants as being endangered in the Vietnam Red Book (2007), 12 species listed in the Governmental Decree and 10 species in the red list of IUCN (2021). These are species with a small number of individuals that need to have policies for conservation and development.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79591281","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
Uvaria clementis (Merr.) Attan., I. M. Turner and R. M. K. Saunders (Annonaceae), a New Record for the Flora of Vietnam
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-10-15 DOI: 10.25073/2588-1140/vnunst.5261
Nguyen Van Hieu, Lai Viet Hung, P. V. Truong, Dang Minh Tu, P. Huyen, N. Q. Nga, P. T. Ngoc, N. Khoi, V. Trung, Nguyen Hoang Hao, Tran Van Mui
{"title":"Uvaria clementis (Merr.) Attan., I. M. Turner and R. M. K. Saunders (Annonaceae), a New Record for the Flora of Vietnam","authors":"Nguyen Van Hieu, Lai Viet Hung, P. V. Truong, Dang Minh Tu, P. Huyen, N. Q. Nga, P. T. Ngoc, N. Khoi, V. Trung, Nguyen Hoang Hao, Tran Van Mui","doi":"10.25073/2588-1140/vnunst.5261","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5261","url":null,"abstract":"The genus Uvaria Juss. is distinguished other genus of Annonaceae especially: Stellate or caespitose hairs, flowers bisexual opposite to leaves, flower are solitary or cymose. Sepal 3, valvate,… Uvaria clementis (Merr.) Attan., I.M. Turn&R.M.K Saunders distributed from  Malaysia, Indonesia, Brunei to Thailan, Campuchia,… The specimen which collected at Dongnai province and saved at The Hebarium National Instiute of Medicinal Materialis is newly recorded for the flora of Vietnam. This study, we are described, illustrated and notes on taxonomy of Uvaria clementis Teaching and scientific research are two main.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86507593","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
Lignans from Gymnema Sylvestre
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-10-12 DOI: 10.25073/2588-1140/vnunst.5365
P. Yen, D. T. Hang, N. Hoang, Ngo Anh Bang, Duong Thi Hai Yen, N. A. Hung, N. Thanh, B. H. Tai, N. X. Nhiem, P. Kiem
{"title":"Lignans from Gymnema Sylvestre","authors":"P. Yen, D. T. Hang, N. Hoang, Ngo Anh Bang, Duong Thi Hai Yen, N. A. Hung, N. Thanh, B. H. Tai, N. X. Nhiem, P. Kiem","doi":"10.25073/2588-1140/vnunst.5365","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5365","url":null,"abstract":"Seven known lignans, tortoside A (1), (+)-syringaresinol (2), (+)-medioresinol (3), (+)-pinoresinol (4), (+)-lyoniresin-6-yl β-D-glucopyranoside (5), (-)-lyoniresinol 3α-O-β-D-glucopyranoside (6), and (-)-lyoniresinol (7) were isolated from the leaves of Gymnema sylvestre (Retz.) R.Br. ex Schult. Their structures were identified on the basis of spectroscopic evidence and in comparison with those reported in the literature. All compounds were reported from G. sylvestre for the first time.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"83 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78250625","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
Development and Validation of a Rapid Analytical Method for Polybrominated Diphenyl Ethers in House Dust 室内粉尘中多溴联苯醚快速分析方法的建立与验证
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-10-12 DOI: 10.25073/2588-1140/vnunst.5485
Quoc Anh Hoang, Pham Dang Minh, Tran Cong Quyet, T. Tri, T. Minh, Shin Takahashi
{"title":"Development and Validation of a Rapid Analytical Method for Polybrominated Diphenyl Ethers in House Dust","authors":"Quoc Anh Hoang, Pham Dang Minh, Tran Cong Quyet, T. Tri, T. Minh, Shin Takahashi","doi":"10.25073/2588-1140/vnunst.5485","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5485","url":null,"abstract":"In this study, a rapid analytical method was developed and validated for the determination of polybrominated diphenyl ethers PBDEs in house dust samples. The dust sample was solvent extracted by using a focused ultrasonic processor with reduced extraction time (total 30 min/sample) and solvent volume (about 30 mL/sample). The crude extract was purified by passing through a self-packed multilayer column containing 44% sulfuric acid impregnated silica gel, Florisil, and anhydrous sodium sulfate. PBDEs were eluted from the clean-up column by a mixture of dichloromethane in hexane (1:3,…). PBDEs (41 mono- to deca-BDE congeners) were analyzed by using gas chromatography/mass spectrometry (GC/MS) with negative chemical ionization (NCI) and selected ion monitoring (SIM) mode. The analytical method was validated by using procedural blank, matrix-spike, and standard reference material (SRM) samples. Recoveries of PBDEs in spiked samples ranged from 65% to 120%. Analytical results of the SRM 2585 (Organic Contaminants in House Dust, National Institute of Standards and Technology, USA) indicate method accuracy with ratios of measured to certified values of almost compounds ranging from 76% to 110%. All the experiments were conducted in duplicate, showing acceptable repeatability (RSD < 15%). This method can be applied for simultaneous determination of mono- to deca-BDE congeners in dust samples at ppb to ppm levels with several advantages such as simple, rapid, accurate, cost-effective, and reducing amounts of chemicals and solvents.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86135944","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
Synthesis and Application of NaNi0.5Ti0.5O2 as Electrode Material for Sodium Ion Batteries 钠离子电池电极材料NaNi0.5Ti0.5O2的合成及应用
VNU Journal of Science: Natural Sciences and Technology Pub Date : 2022-09-22 DOI: 10.25073/2588-1140/vnunst.5186
N. Nghia, Pham Manh Thao, Nguyên Van Ky, Ngo Quy Quyen, P. D. Long, D. Chien, Nguyen Si Hieu
{"title":"Synthesis and Application of NaNi0.5Ti0.5O2 as Electrode Material for Sodium Ion Batteries","authors":"N. Nghia, Pham Manh Thao, Nguyên Van Ky, Ngo Quy Quyen, P. D. Long, D. Chien, Nguyen Si Hieu","doi":"10.25073/2588-1140/vnunst.5186","DOIUrl":"https://doi.org/10.25073/2588-1140/vnunst.5186","url":null,"abstract":"In this work, NaNi0.5Ti0.5O2 cathode materials of sodium ion batteries were synthesized by a pre-milling combined with solid-state reaction method using sodium hydroxide (NaOH), nickel (II) acetate (2(CH3COO)Ni.4H2O), and titanium dioxide (TiO2) as the precursors. Results of X-ray diffraction analysis of the materials obtained after the milling and calcination processes revealed that the increment of the pre-milling time improved the reactivity of NaOH and TiO2, thereby significantly reduced the content of NiO impurity in the NaNi0.5Ti0.5O2 product. The as-synthesized cathode material possessed an excellent electrochemical performance with 77% capacity (compared to the second cycle) retained after 50 cycles of charge/discharge, and 60% capacity retention when the rate of charge/discharge increased from 0.5 to 8 C.","PeriodicalId":23524,"journal":{"name":"VNU Journal of Science: Natural Sciences and Technology","volume":"418 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79491188","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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