Pub Date : 2022-11-14DOI: 10.32508/stdj.v25i3.3961
T. Huynh, Nguyen H. Tran, Thi Thuy Duong Pham, Nguyen Huong Giang Vo, L. Nguyen, Ngoc My Huong Nguyen, Van Dung Nguyen, Thi Thu Hoai Nguyen
{"title":"Identification of commensal Pseudomonas aeruginosa isolates using duplex PCR targeting the oprL and algD genes","authors":"T. Huynh, Nguyen H. Tran, Thi Thuy Duong Pham, Nguyen Huong Giang Vo, L. Nguyen, Ngoc My Huong Nguyen, Van Dung Nguyen, Thi Thu Hoai Nguyen","doi":"10.32508/stdj.v25i3.3961","DOIUrl":"https://doi.org/10.32508/stdj.v25i3.3961","url":null,"abstract":"","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127759099","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}
Pub Date : 2021-05-10DOI: 10.32508/STDJ.V24I2.2508
K. Lê, Huynh Thi Mong Tuyen, T. Vo, Hoang V. Nguyen, N. Tran, M. Tran, P. Le
Introduction: Localized high concentration electrolytes (LHCE) have been intensively studied due to their unique properties, especially in suppressing the Na dendrite formation and long-term cycling. Therefore, the low electrochemical performance of the P2-type cathode can be overcome by using LHCE. Methods: P2-type sodium layered oxides Na2=3Mn2=3M1=3O2 (M = Fe, Co, Ni) cathode materials were synthesized via a simple co-precipitation following a supported solid-state reaction. XRD and Rietveld method analyzed the phase composition and lattice parameters. SEM images observed the morphology of materials. The half-cell of three cathode were performed in LHCE consisting of 2.1 M sodium bis(fluorosulfonyl)imide (NaFSI) dissolved in 1,2-dimethoxyethane (DME) and bis(2,2,2-trifluoroethyl) ether (BTFE) (solvent molar ratio 1:2). The galvanostatic charge-discharge, striping-plating, and linear sweep voltage tests were carried out to investigate the electrochemical behaviors. Results: As-prepared electrode materials exhibited discharge capacities of 94.5, 147.1, and 142.9 mAh/g at C/10 in the potential range of 1.5-4.2 V for Na2=3Mn2=3Fe1=3O2 (MFO), Na2=3Mn2=3Co1=3O2 (MCO) and Na2=3Mn2=3Ni1=3O2 (MNO), respectively. Interestingly, the MNO cathode material has a superior cycling performance with 86.5% capacity retention after 100 cycles than MCO and MFO. Conclusion: Such superior electrochemical performance of synthesized MNO could be ascribed to the combined synergistic effects between the nickel partially substituted MNO cathode structure and using LHCE 2.1 M NaFSI/DME-BTFE (1:2). Nickel substituted MNO cathode exhibited the enhancement of discharge capacity and the long cycling stability in LHCE due to the mitigation of dendrite formation on sodium metal anode.
{"title":"P2- a2=3Mn2=3M1=3O2 (M = Fe, Co, Ni) cathode materials in localized high concentration electrolyte for the long-cycling performance of sodium-ion batteries","authors":"K. Lê, Huynh Thi Mong Tuyen, T. Vo, Hoang V. Nguyen, N. Tran, M. Tran, P. Le","doi":"10.32508/STDJ.V24I2.2508","DOIUrl":"https://doi.org/10.32508/STDJ.V24I2.2508","url":null,"abstract":"Introduction: Localized high concentration electrolytes (LHCE) have been intensively studied due to their unique properties, especially in suppressing the Na dendrite formation and long-term cycling. Therefore, the low electrochemical performance of the P2-type cathode can be overcome by using LHCE. \u0000Methods: P2-type sodium layered oxides Na2=3Mn2=3M1=3O2 (M = Fe, Co, Ni) cathode materials were synthesized via a simple co-precipitation following a supported solid-state reaction. XRD and Rietveld method analyzed the phase composition and lattice parameters. SEM images observed the morphology of materials. The half-cell of three cathode were performed in LHCE consisting of 2.1 M sodium bis(fluorosulfonyl)imide (NaFSI) dissolved in 1,2-dimethoxyethane (DME) and bis(2,2,2-trifluoroethyl) ether (BTFE) (solvent molar ratio 1:2). The galvanostatic charge-discharge, striping-plating, and linear sweep voltage tests were carried out to investigate the electrochemical behaviors. \u0000Results: As-prepared electrode materials exhibited discharge capacities of 94.5, 147.1, and 142.9 mAh/g at C/10 in the potential range of 1.5-4.2 V for Na2=3Mn2=3Fe1=3O2 (MFO), Na2=3Mn2=3Co1=3O2 (MCO) and Na2=3Mn2=3Ni1=3O2 (MNO), respectively. Interestingly, the MNO cathode material has a superior cycling performance with 86.5% capacity retention after 100 cycles than MCO and MFO. \u0000Conclusion: Such superior electrochemical performance of synthesized MNO could be ascribed to the combined synergistic effects between the nickel partially substituted MNO cathode structure and using LHCE 2.1 M NaFSI/DME-BTFE (1:2). Nickel substituted MNO cathode exhibited the enhancement of discharge capacity and the long cycling stability in LHCE due to the mitigation of dendrite formation on sodium metal anode.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121237422","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}
Pub Date : 2021-03-17DOI: 10.32508/STDJ.V24I1.2489
Nhu Hoa Thi Tran, Phuong Tran, B. T. Phan, H. Tạ, Ngoc Xuan Dat Mai, Lai Thi Hoa, T. Tran, Dung V. Hoang
Introduction: C-reactive protein (CPR) is known as an inflammation marker related to numerous pathology. Optical biosensor based on the fluorescence dyed is widely used in diagnosis. There are still limitations on the fluorescence signal detection due to the photobleaching effect. The localized surface plasmon resonance (LSPR) performed by gold nanoparticles (Au NPs) is testified for the enhancement of photo-signal gathered from the dye molecules. Methods: In this study, Au NPs were used for their significant optical properties and biocompatibility additionally. The seed-mediated synthesis method provided stable NPs with all the essential qualities. A series of modification steps were done on a glass substrate before the bio-bonding for fluorescence-based sensing by a transmission mode (T-mode) detection system which is introduced for the first time in Viet Nam. Results: The synthetic Au NPs in nanosphere structure evinced the absorbance at a maximum wavelength is 521 nm. All the followed alterations showed the accomplishment in forming the in need linking proved through the basic analysis methods. Finally, CRP with the Alexa 488 dye was observed for average at 4.8 folds of enhancement factor compared between the Au NPs coating and non-coating substrate detected by the T-mode system. The low coefficient of variation at under 0.7% appeared for the repeatability and stability of this sensor. Conclusion: The completely modern approach of the T-mode system combined with the LSPR applied in fluorescence sensors enhanced is developed successfully. Also, the future prospect of this designed sensing method is promising by changing the materials' structures and ingredients. Keywords: LSPR, gold nanoparticles, fluorescence enhancement, C-reaction protein, optical biosensors
{"title":"Gold nanoparticles enhanced fluorescence for highly sensitive biosensors based on localized surface plasmon resonance applied in determination C-reactive protein","authors":"Nhu Hoa Thi Tran, Phuong Tran, B. T. Phan, H. Tạ, Ngoc Xuan Dat Mai, Lai Thi Hoa, T. Tran, Dung V. Hoang","doi":"10.32508/STDJ.V24I1.2489","DOIUrl":"https://doi.org/10.32508/STDJ.V24I1.2489","url":null,"abstract":"Introduction: C-reactive protein (CPR) is known as an inflammation marker related to numerous pathology. Optical biosensor based on the fluorescence dyed is widely used in diagnosis. There are still limitations on the fluorescence signal detection due to the photobleaching effect. The localized surface plasmon resonance (LSPR) performed by gold nanoparticles (Au NPs) is testified for the enhancement of photo-signal gathered from the dye molecules. \u0000Methods: In this study, Au NPs were used for their significant optical properties and biocompatibility additionally. The seed-mediated synthesis method provided stable NPs with all the essential qualities. A series of modification steps were done on a glass substrate before the bio-bonding for fluorescence-based sensing by a transmission mode (T-mode) detection system which is introduced for the first time in Viet Nam. \u0000Results: The synthetic Au NPs in nanosphere structure evinced the absorbance at a maximum wavelength is 521 nm. All the followed alterations showed the accomplishment in forming the in need linking proved through the basic analysis methods. Finally, CRP with the Alexa 488 dye was observed for average at 4.8 folds of enhancement factor compared between the Au NPs coating and non-coating substrate detected by the T-mode system. The low coefficient of variation at under 0.7% appeared for the repeatability and stability of this sensor. \u0000Conclusion: The completely modern approach of the T-mode system combined with the LSPR applied in fluorescence sensors enhanced is developed successfully. Also, the future prospect of this designed sensing method is promising by changing the materials' structures and ingredients. \u0000Keywords: LSPR, gold nanoparticles, fluorescence enhancement, C-reaction protein, optical biosensors","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121136052","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}
Pub Date : 2021-01-12DOI: 10.32508/STDJ.V23I4.2457
T. Nguyen, T. Bui, P. K. Nguyen, C. M. Tran, T. Phan, T. T. Nguyen
Introduction: Bruguiera cylindrica is one of the mangrove plants belonging to Bruguiera genus. This genus is characterized by the presence of a large number of compounds, but the research on bioactivities has not been investigated so far. In the present research, the α-glucosidase inhibitory activity, as well as chemical constituents of the ethyl acetate extract of this plant, were studied. Methods: The chemical structures of two new compounds were elucidated by spectroscopic and computational methods. Results: Two new compounds, benzobrugierol (1) and bruguierine (2), were isolated from leaves of Bruguiera cylindrica (L.) Blume, together with nine known ones, including lupeol (3), betulin (4), chrysoeriol (5), glut-5-ene-3-ol (6), cholesta-4-ene-3-one (7), 3α-(Z)-coumaroyllupeol (8), 3α-(E)-coumaroyllupeol (9), 3β-hydroxycholesta-5-ene-7-one (10) and β-sitosterol 3-O-β-D-glucopyranoside (11). Extracts and some isolated compounds were evaluated for α-glucosidase inhibitory activities. Conclusion: The results showed that most of the extracts and tested compounds exhibited activities better than the positive control acarbose, especially two new compounds 1 and 2 with their IC50 values of 17.9 ± 0.4 and 34.6 ± 0.7 (mg/mL), respectively.
简介:白茅属红树植物白茅属。该属植物的特点是含有大量的化合物，但对其生物活性的研究迄今尚未开展。本研究对该植物乙酸乙酯提取物的α-葡萄糖苷酶抑制活性及化学成分进行了研究。方法:采用光谱学和计算方法对两种新化合物的化学结构进行分析。结果:从白茅叶中分离到两个新化合物:苯并brugierol(1)和bruguierine(2)。与已知的九种化合物，包括鹿皮醇(3)、桦木素(4)、黄蜡醇(5)、谷氨酸-5-烯-3-醇(6)、胆甾醇-4-烯-3-酮(7)、3α-(Z)-香豆酰鹿皮醇(8)、3α-(E)-香豆酰鹿皮醇(9)、3β-羟基胆甾醇-5-烯-7-酮(10)和β-谷甾醇3- 0 -β- d -葡萄糖吡喃苷(11)。对提取物及部分分离化合物的α-葡萄糖苷酶抑制活性进行了评价。结论:大部分提取物和被试化合物的活性均优于阳性对照阿卡波糖，其中新化合物1和2的IC50值分别为17.9±0.4和34.6±0.7 (mg/mL)。
{"title":"Two new compounds from leaves of Bruguiera cylindrica (L.) Blume with the in vitro α-glucosidase inhibitory activity","authors":"T. Nguyen, T. Bui, P. K. Nguyen, C. M. Tran, T. Phan, T. T. Nguyen","doi":"10.32508/STDJ.V23I4.2457","DOIUrl":"https://doi.org/10.32508/STDJ.V23I4.2457","url":null,"abstract":"Introduction: Bruguiera cylindrica is one of the mangrove plants belonging to Bruguiera genus. This genus is characterized by the presence of a large number of compounds, but the research on bioactivities has not been investigated so far. In the present research, the α-glucosidase inhibitory activity, as well as chemical constituents of the ethyl acetate extract of this plant, were studied. \u0000Methods: The chemical structures of two new compounds were elucidated by spectroscopic and computational methods. \u0000Results: Two new compounds, benzobrugierol (1) and bruguierine (2), were isolated from leaves of Bruguiera cylindrica (L.) Blume, together with nine known ones, including lupeol (3), betulin (4), chrysoeriol (5), glut-5-ene-3-ol (6), cholesta-4-ene-3-one (7), 3α-(Z)-coumaroyllupeol (8), 3α-(E)-coumaroyllupeol (9), 3β-hydroxycholesta-5-ene-7-one (10) and β-sitosterol 3-O-β-D-glucopyranoside (11). Extracts and some isolated compounds were evaluated for α-glucosidase inhibitory activities. \u0000Conclusion: The results showed that most of the extracts and tested compounds exhibited activities better than the positive control acarbose, especially two new compounds 1 and 2 with their IC50 values of 17.9 ± 0.4 and 34.6 ± 0.7 (mg/mL), respectively.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128504167","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}
Pub Date : 2020-12-31DOI: 10.32508/STDJ.V23I4.2478
T. Le
Introduction: The procedure to synthesize silver nanoparticles (SNPs) from Prunus cerasoides leaf extract and their effect on vase life and flower quality of cut carnation were investigated. Methods: SNPs were bio-synthesized from Prunus cerasoides leaf extract and characterized by using UV-Vis technique, TEM, and SEM images. The postharvest responses of carnation cut flowers to the biosynthesis SNPs were evaluated through vase life, relative fresh weight, vase solution uptake, flower diameter of cut carnation. Results: SNPs were synthesized under optimum conditions, including using the extract of leaf heating at 60 oC in 30 min, 4 mM of silver nitrate, pH of 11, and 180 min of reaction time. SNPs exhibited antimicrobial activity and then alleviated the bacterial development in the preservative solution. All treatments with SNPs had improved the vase life and quality of cut carnation compared to the control. A vase solution containing 2% sucrose enhanced the carnation cut flowers. Conclusions: The preservative solution containing 25 ppm SNPs and 2% sucrose showed the best effect. SNPs could be used as a promising antibacterial agent applied in the preservative solution for cut carnation flowers.
摘要:研究了以石竹叶提取物为原料合成纳米银的工艺及其对石竹切花花瓶寿命和花品质的影响。方法:利用紫外可见光谱(UV-Vis)、透射电镜(TEM)和扫描电镜(SEM)对桃李叶提取物进行生物合成，并对snp进行表征。通过插瓶寿命、相对鲜重、插瓶液吸收量、插花直径等指标，评价了康乃馨切花采后对生物合成snp的响应。结果:在60℃加热30 min，硝酸银4 mM, pH = 11，反应时间180 min的条件下，合成了最佳的snp。SNPs表现出抗菌活性，从而减缓了防腐剂溶液中细菌的生长。与对照相比，所有SNPs处理均提高了康乃馨插瓶寿命和切花质量。含有2%蔗糖的花瓶溶液增强了康乃馨切花的效果。结论:含25 ppm snp和2%蔗糖的保鲜液效果最佳。SNPs是一种很有前途的抗菌剂，应用于康乃馨切花防腐液中。
{"title":"Postharvest responses of Carnation cut flowers to Prunus cerasoides mediated silver nanoparticles","authors":"T. Le","doi":"10.32508/STDJ.V23I4.2478","DOIUrl":"https://doi.org/10.32508/STDJ.V23I4.2478","url":null,"abstract":"Introduction: The procedure to synthesize silver nanoparticles (SNPs) from Prunus cerasoides leaf extract and their effect on vase life and flower quality of cut carnation were investigated. \u0000Methods: SNPs were bio-synthesized from Prunus cerasoides leaf extract and characterized by using UV-Vis technique, TEM, and SEM images. The postharvest responses of carnation cut flowers to the biosynthesis SNPs were evaluated through vase life, relative fresh weight, vase solution uptake, flower diameter of cut carnation. \u0000Results: SNPs were synthesized under optimum conditions, including using the extract of leaf heating at 60 oC in 30 min, 4 mM of silver nitrate, pH of 11, and 180 min of reaction time. SNPs exhibited antimicrobial activity and then alleviated the bacterial development in the preservative solution. All treatments with SNPs had improved the vase life and quality of cut carnation compared to the control. A vase solution containing 2% sucrose enhanced the carnation cut flowers. \u0000Conclusions: The preservative solution containing 25 ppm SNPs and 2% sucrose showed the best effect. SNPs could be used as a promising antibacterial agent applied in the preservative solution for cut carnation flowers.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114863908","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}
Pub Date : 2020-10-25DOI: 10.32508/stdj.v23i4.2449
P. Tuyến, N. T. Q. Trang, Huynh Cong Doan, P. Thuong, Nguyen Trung Duan, Tran Doan Duy Cuong, H. B. L. Chi, N. Tuyet, N. Phung, T. Nguyen
Introduction: Sterculia foetida Linn. is widely distributed in tropical countries. As the continuous study on the hexane and ethyl acetate extracts of Sterculia foetida leaves, the isolation and structural determination of four triterpenoids and two coumarins were addressed. Method: The crude extract was prepared from dried power of Sterculia foetida leaves by maceration method in ethanol. This extract was then separated by liquid-liquid partition with n-hexane, chloroform, and ethyl acetate, respectively, to obtain the corresponding extracts. The hexane and ethyl acetate extracts were applied to multiple silica gel column chromatography to yield six compounds. Their chemical structures were determined by the NMR data analysis as well as the comparison their spectroscopic data and physical properties with those of reported literature. Results: Four triterpenoid compounds, including betulinic acid (1), conyzasaponin G (2), taraxerol (3), and taraxer-14-ene- 1a,3b -diol (4), and two coumarins fraxetin (5), and aesculin (6) were identified. Conclusion: To the best of our knowledge, they have not been reported in the leaves of Sterculia foetida before, and compound 2 was known to present in Sterculia genus for the first time.
{"title":"Triterpenoids and coumarins from the leaves of Sterculia foetida Linn.","authors":"P. Tuyến, N. T. Q. Trang, Huynh Cong Doan, P. Thuong, Nguyen Trung Duan, Tran Doan Duy Cuong, H. B. L. Chi, N. Tuyet, N. Phung, T. Nguyen","doi":"10.32508/stdj.v23i4.2449","DOIUrl":"https://doi.org/10.32508/stdj.v23i4.2449","url":null,"abstract":"Introduction: Sterculia foetida Linn. is widely distributed in tropical countries. As the continuous study on the hexane and ethyl acetate extracts of Sterculia foetida leaves, the isolation and structural determination of four triterpenoids and two coumarins were addressed. \u0000Method: The crude extract was prepared from dried power of Sterculia foetida leaves by maceration method in ethanol. This extract was then separated by liquid-liquid partition with n-hexane, chloroform, and ethyl acetate, respectively, to obtain the corresponding extracts. The hexane and ethyl acetate extracts were applied to multiple silica gel column chromatography to yield six compounds. Their chemical structures were determined by the NMR data analysis as well as the comparison their spectroscopic data and physical properties with those of reported literature. \u0000Results: Four triterpenoid compounds, including betulinic acid (1), conyzasaponin G (2), taraxerol (3), and taraxer-14-ene- 1a,3b -diol (4), and two coumarins fraxetin (5), and aesculin (6) were identified. \u0000Conclusion: To the best of our knowledge, they have not been reported in the leaves of Sterculia foetida before, and compound 2 was known to present in Sterculia genus for the first time.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127792468","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}
Pub Date : 2020-07-27DOI: 10.32508/stdj.v23i3.2410
T. Nguyen, N. Tran, N. Dang, L. Truong, H. T. Nguyen
Introduction: Electrospinning is now being widely used as a potential tool for tissue engineering to manufacturing tissue grafts, wound dressings, medical fabrics, and drug delivery systems. Regarding biomaterials, polyurethane (PU) and polycaprolactone (PCL) and their combination are prospective candidates for the fabrication of electrospun membranes used in tissue engineering due to their suitable biocompatibility, biodegradability, and mechanical properties. Thus, this study investigates how to manipulate the electrospinning process of PU/PCL to obtain nanofibers with desired features. Methods: PU/PCL dissolved in N,N-Dimethylformamide, and tetrahydrofuran were electrospun with various applied voltages, tip-to-collector distances, and flow rates. The collected membranes were observed using a scanning electron microscope to evaluate the effect of electrospinning conditions on their morphology and fiber diameters. Results: Slower flow rate, longer tip-to-collector distance, and higher voltage all led to smaller, more uniform fibers. By manipulating these factors, the study yielded a non-woven, porous membrane with uniform, separated nanofibers at the condition set of 12 cm tip-to-collector, 20 kV applied, and 0.5 mL/h flow rate. Conclusion: The study determined the effect of electrospinning parameters on the morphology of polycaprolactone/polyurethane fibers and obtained membrane with suitable properties for further research.
{"title":"Effect of electrospinning parameters on the morphology of polyurethane/polycaprolactone fibers","authors":"T. Nguyen, N. Tran, N. Dang, L. Truong, H. T. Nguyen","doi":"10.32508/stdj.v23i3.2410","DOIUrl":"https://doi.org/10.32508/stdj.v23i3.2410","url":null,"abstract":"Introduction: Electrospinning is now being widely used as a potential tool for tissue engineering to manufacturing tissue grafts, wound dressings, medical fabrics, and drug delivery systems. Regarding biomaterials, polyurethane (PU) and polycaprolactone (PCL) and their combination are prospective candidates for the fabrication of electrospun membranes used in tissue engineering due to their suitable biocompatibility, biodegradability, and mechanical properties. Thus, this study investigates how to manipulate the electrospinning process of PU/PCL to obtain nanofibers with desired features. \u0000Methods: PU/PCL dissolved in N,N-Dimethylformamide, and tetrahydrofuran were electrospun with various applied voltages, tip-to-collector distances, and flow rates. The collected membranes were observed using a scanning electron microscope to evaluate the effect of electrospinning conditions on their morphology and fiber diameters. \u0000Results: Slower flow rate, longer tip-to-collector distance, and higher voltage all led to smaller, more uniform fibers. By manipulating these factors, the study yielded a non-woven, porous membrane with uniform, separated nanofibers at the condition set of 12 cm tip-to-collector, 20 kV applied, and 0.5 mL/h flow rate. \u0000Conclusion: The study determined the effect of electrospinning parameters on the morphology of polycaprolactone/polyurethane fibers and obtained membrane with suitable properties for further research.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123909019","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}
Pub Date : 2020-05-24DOI: 10.32508/stdj.v23i2.2056
D. Nguyen
Introduction: In the present study, we evaluate the nucleon evaporation, alpha decay, and fission widths in the fusion-fission of the 58Ni+251Cf and 64Zn + 248Cm reactions for the synthesis of the super-heavy 309, 312126 nuclei. Methods: The feasibility of the synthesis of the 309, 312126 isotopes via the mentioned systems is investigated based on the widths. The widths in the excitation energy range of E* = 10 – 100 MeV are calculated in the scope of the statistical model, in which the level density is calculated by using the Fermi-gas model. By employing the LISE++ code, the level densities the compound nuclei, 309, 312126 nuclei, are calculated to be about 105 – 1050 (MeV-1) in the energy range of interest. Results: The lifetime of the compound nuclei, 309, 312126 nuclei, which are estimated based on the total width, is about 10-22-10-20 s. The fission has the largest width compared to those of the alpha decay and nucleon evaporations. Hence, the 58Ni+251Cf and 64Zn + 248Cm combinations are appropriate to the study of the mass distribution. In addition, the large alpha decay widths suggest the 309, 312126 isotopes be the alpha-decay nuclei. Conclusion: The results are expected to be useful for considering measurements at facilities in the near future.
{"title":"Fusion-fission in the reactions of the 58Ni + 251Cf and 64Zn + 248Cm combinations","authors":"D. Nguyen","doi":"10.32508/stdj.v23i2.2056","DOIUrl":"https://doi.org/10.32508/stdj.v23i2.2056","url":null,"abstract":"Introduction: In the present study, we evaluate the nucleon evaporation, alpha decay, and fission widths in the fusion-fission of the 58Ni+251Cf and 64Zn + 248Cm reactions for the synthesis of the super-heavy 309, 312126 nuclei. \u0000Methods: The feasibility of the synthesis of the 309, 312126 isotopes via the mentioned systems is investigated based on the widths. The widths in the excitation energy range of E* = 10 – 100 MeV are calculated in the scope of the statistical model, in which the level density is calculated by using the Fermi-gas model. By employing the LISE++ code, the level densities the compound nuclei, 309, 312126 nuclei, are calculated to be about 105 – 1050 (MeV-1) in the energy range of interest. \u0000Results: The lifetime of the compound nuclei, 309, 312126 nuclei, which are estimated based on the total width, is about 10-22-10-20 s. The fission has the largest width compared to those of the alpha decay and nucleon evaporations. Hence, the 58Ni+251Cf and 64Zn + 248Cm combinations are appropriate to the study of the mass distribution. In addition, the large alpha decay widths suggest the 309, 312126 isotopes be the alpha-decay nuclei. \u0000Conclusion: The results are expected to be useful for considering measurements at facilities in the near future.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129291951","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}
Pub Date : 2020-04-25DOI: 10.32508/stdj.v23i2.1730
Aishwariya Sachidhanandham
The global textile business is now gearing towards greener alternatives to combat pollution and avoid synthetics in production. Ironically, there is an increased awareness among consumers on the quality of the product and choices they make in their shopping. The natural and synthetic fibres have set limitations, which has made manufacturers look out for other alternative fibres. Bamboo, banana, milk, and corn are experimented for its commercial capabilities to perform as a textile material. To add on to the list, orange, the popular, and the most preferred fruit are known for its refreshing flavour. The peels after consumption/ processing of the fruit are discarded in the landfill, which is an organic waste with immense potential. This paper details the successful brand ‘Orange fibre’, its journey from scratch, and the properties of textiles made from processing orange peel waste. The current areas of research have also been covered in a brief way, to invite more scholars to create solutions for the hitherto pollution orange peel waste.
{"title":"Textiles from orange peel waste","authors":"Aishwariya Sachidhanandham","doi":"10.32508/stdj.v23i2.1730","DOIUrl":"https://doi.org/10.32508/stdj.v23i2.1730","url":null,"abstract":"The global textile business is now gearing towards greener alternatives to combat pollution and avoid synthetics in production. Ironically, there is an increased awareness among consumers on the quality of the product and choices they make in their shopping. The natural and synthetic fibres have set limitations, which has made manufacturers look out for other alternative fibres. Bamboo, banana, milk, and corn are experimented for its commercial capabilities to perform as a textile material. To add on to the list, orange, the popular, and the most preferred fruit are known for its refreshing flavour. The peels after consumption/ processing of the fruit are discarded in the landfill, which is an organic waste with immense potential. This paper details the successful brand ‘Orange fibre’, its journey from scratch, and the properties of textiles made from processing orange peel waste. The current areas of research have also been covered in a brief way, to invite more scholars to create solutions for the hitherto pollution orange peel waste. \u0000 ","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131559437","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}
Pub Date : 2020-02-17DOI: 10.32508/stdj.v23i1.1715
S. Nguyen, P. Vu
Introduction: Understanding the binding mechanism between gold and is a fundamental step for numerous applications in biosensors and targeted drug delivery. This study aims to clarify the adsorption behaviors of CYS and GSH on the gold surface using a small gold Au8 cluster as a model reactant. Methods: Here, we examine in details the molecular interaction between Au8 cluster with (CYS) and (GSH) by means of density functional theory (DFT). The PBE functional is employed in combination with the basis set for non-metal atoms and the basis set for gold. Harmonic frequencies are also computed to confirm optimized geometries as local minima or transition states on the potential energy surfaces. Results: The calculated results show that these molecules prefer to anchor on the gold cluster via the sulfur atom with the adsorption energies of 20.3 and 30.8 / for CYS and GSH, respectively, in gas phase. In water, such values are considerably reduced, namely 19.0 / for CYS and 26.4 / for GSH. If a visible light with a frequency of v = 6x1014 Hz (500 nm) is applied, the time for the recovery of CYS and GSH from the most stable complexes will be about 1.24 and 6.03x107 seconds at 298 K in gas phase. Conclusion: The Au8 cluster could be a promising material for designing sensor in CYS and GSH selective detection.
{"title":"A computational study of cysteine and glutathione binding to small gold cluster Au8","authors":"S. Nguyen, P. Vu","doi":"10.32508/stdj.v23i1.1715","DOIUrl":"https://doi.org/10.32508/stdj.v23i1.1715","url":null,"abstract":"Introduction: Understanding the binding mechanism between gold and is a fundamental step for numerous applications in biosensors and targeted drug delivery. This study aims to clarify the adsorption behaviors of CYS and GSH on the gold surface using a small gold Au8 cluster as a model reactant. \u0000Methods: Here, we examine in details the molecular interaction between Au8 cluster with (CYS) and (GSH) by means of density functional theory (DFT). The PBE functional is employed in combination with the basis set for non-metal atoms and the basis set for gold. Harmonic frequencies are also computed to confirm optimized geometries as local minima or transition states on the potential energy surfaces. \u0000Results: The calculated results show that these molecules prefer to anchor on the gold cluster via the sulfur atom with the adsorption energies of 20.3 and 30.8 / for CYS and GSH, respectively, in gas phase. In water, such values are considerably reduced, namely 19.0 / for CYS and 26.4 / for GSH. If a visible light with a frequency of v = 6x1014 Hz (500 nm) is applied, the time for the recovery of CYS and GSH from the most stable complexes will be about 1.24 and 6.03x107 seconds at 298 K in gas phase. \u0000Conclusion: The Au8 cluster could be a promising material for designing sensor in CYS and GSH selective detection.","PeriodicalId":285953,"journal":{"name":"Science and Technology Development Journal","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131592716","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}
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