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Review: fish collagen: extraction, characterization and application in wound healing and drug delivery 综述：鱼胶原蛋白：提取、表征以及在伤口愈合和药物输送中的应用
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/19438
Nguyen Thuy Chinh, T. Hoang
{"title":"Review: fish collagen: extraction, characterization and application in wound healing and drug delivery","authors":"Nguyen Thuy Chinh, T. Hoang","doi":"10.15625/2525-2518/19438","DOIUrl":"https://doi.org/10.15625/2525-2518/19438","url":null,"abstract":"Collagen is a natural protein presenting in the animal and human’s body. It is in natural fibrous and could be found in the connective tissue and flesh of mammal, approximately 25-35 wt.% of total human protein. Collagen is abundant in fibrous tissues such as: bones, cartilage, tendons, blood vessels, ligaments, skin, cornea, aortic disc and intestines. Fish collagen is currently being studied as a new biological substitute for collagen from animals. It extracted from by-products (scales, skins, bones, etc.) by biochemical or biological methods is safe, has high adsorption, high compatible. The factors influencing on the extraction process include temperature, time, concentration of ingredients, etc. The fish collagen is usually collagen type I with a fibril structure. Each unit of collagen is tropocollagen consisting of three polypeptide chains twisted together. Depending on the source of ingredients, the composition of aminoacids, denaturation temperature, the sequence of aminoacids, structure, morphology, molecular weight, extraction yield, etc. of obtained collagens are different. This paper reviews the extraction and characterization of fish collagen from products after fish processing by chemical or biochemical methods. The applications of fish collagen in wound healing and drug delivery are also reviewed.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"13 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437599","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
Extracellular L-asparaginase productive potential of the Priestia megaterium strain GB911 from Khanh Hoa sea of Viet Nam 越南庆和海巨朊病毒菌株 GB911 的胞外 L-天冬酰胺酶生产潜力
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/17906
Do T. Phuong, N. M. Anh, Nguyen Thi Nga, Vu Thi Thu Huyen, N. Cuc, Trieu H. Phuong, Le Thi Hong Minh, Do Thi Thao
{"title":"Extracellular L-asparaginase productive potential of the Priestia megaterium strain GB911 from Khanh Hoa sea of Viet Nam","authors":"Do T. Phuong, N. M. Anh, Nguyen Thi Nga, Vu Thi Thu Huyen, N. Cuc, Trieu H. Phuong, Le Thi Hong Minh, Do Thi Thao","doi":"10.15625/2525-2518/17906","DOIUrl":"https://doi.org/10.15625/2525-2518/17906","url":null,"abstract":"Currently, L-asparaginase isolated from terrestrial microorganisms has been employed for anticancer industrial production. This enzyme has the function of inhibiting the growth of acute lymphoblastic leukemia, Hodgkin's lymphomas and other cancers. In this study, for the first time, L-asparaginase (ASNase) productive capacity of forty marine bacteria originating from Khanh Hoa sea of Viet Nam was screened and reported. Among those, twenty eight isolates were clarified for their extracellular ASNase activity based on their ability to form a pink zone around colonies on asparagine agar plates. As a result, four strains GB910, GB911, GB976 and GB982 showed high secreted extracellular ASNase activity, ranging from 8.64 to 13.22 IU/mg. Among these four most potential strains, GB911 exhibited better enzyme production capacity and was subjected to taxonomy identification. According to the 16S rRNA gene sequence on the GenBank database, strain GB911 was identified as Priestia megaterium and registered in the GenBank database with accession number MW407014. The purified enzyme obtained from strain GB911 exhibited strong cytotoxic activity against five monolayer and suspension cancerous cell lines with IC50 values ranging from 39 mU/mL to 98 mU/mL. The strain could serve as a promising source for industrial production of ASNase for clinical chemotherapeutic treatment.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"17 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437066","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 new method of failure analysis 故障分析的新方法
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/18622
Sergei Alexandrov, Marina I. Rynkovskaya, Ismet Bajmuratov, Ruslan Kalistratov, Ivan Pylkin
{"title":"A new method of failure analysis","authors":"Sergei Alexandrov, Marina I. Rynkovskaya, Ismet Bajmuratov, Ruslan Kalistratov, Ivan Pylkin","doi":"10.15625/2525-2518/18622","DOIUrl":"https://doi.org/10.15625/2525-2518/18622","url":null,"abstract":"The present paper develops a new failure analysis method under plane strain conditions considering a generalized linear yield criterion. The yield criterion and the stress equilibrium equations constitute a hyperbolic system of equations. It is shown that two auxiliary variables satisfy the equation of telegraphy. Simple analytical relationships connect these variables and the radii of curvature of the characteristic curves. The calculated radii of curvature allow for the corresponding characteristic net to be constructed. Then, the stress field is determined using another set of analytical relationships. Thus, a numerical procedure is only necessary for solving the equation of telegraphy. This equation can be integrated by the method of Riemann. In particular, Green’s function is the Bessel function of zero order. A simple example illustrates the general method.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"23 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140436436","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
Modern software capabilities for shape optimization of shells 优化壳体形状的现代软件功能
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/18788
E. Ermakova, Marina I. Rynkovskaya
{"title":"Modern software capabilities for shape optimization of shells","authors":"E. Ermakova, Marina I. Rynkovskaya","doi":"10.15625/2525-2518/18788","DOIUrl":"https://doi.org/10.15625/2525-2518/18788","url":null,"abstract":"The article is devoted to the shape optimization of shell structures in Comsol Multiphysics using three gradient-based methods: IPOPT (Interior Point OPTimizer), SNOPT (Sparse Nonlinear OPTimizer) and MMA or GCMMA (the Method of Moving Asymptotes). Two types of complex shapes, such as right helicoid and developable helicoid are taken for the computational experiment. The task is to investigate the initial design and optimization process of two helicoids. To obtain a more accurate result and an interesting design solution, the calculation is carried out using three physics-controlled mesh sizes: extra coarse, fine and extra fine with varying values of special optimization settings, such as maximum displacement (dmax) and filter radius (Rmin). The results obtained using the three methods allow to conclude that the mesh element size and studied parameters dmax and Rmin have a significant impact on the final optimization result.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437005","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
Impact of Hysteresis Curve on Subthreshold Swing in Ferroelectric FET 磁滞曲线对铁电场效应晶体管阈下波动的影响
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/18627
Hakkee Jung
{"title":"Impact of Hysteresis Curve on Subthreshold Swing in Ferroelectric FET","authors":"Hakkee Jung","doi":"10.15625/2525-2518/18627","DOIUrl":"https://doi.org/10.15625/2525-2518/18627","url":null,"abstract":"The changes in Subthreshold Swing (SS) were observed for changes in remanent polarization Pr and coercive field Ec, which determine the characteristics of the P-E hysteresis curve of ferroelectric in Ferrolectric FET (FeFET). A multilayer structure of Metal-Ferroelectric-Metal-Insulator-Semiconductor (MFMIS) was used for the junctionless double gate structure. To obtain the SS value, the analytical SS model was used. The ranges of 15≤Pr ≤30 μC/cm2 and 0.8≤Ec≤1.5 MV/cm, which were reasonable in various experiments and did not generate unstable regions in the relationship of drain current and gate voltage, were considered. As a result, the SS decreased as Pr decreased and Ec increased due to the capacitance change in the ferroelectric. This phenomenon is because the controllability of channel carriers by the gate voltage increases due to the increasing of change in the ferroelectric voltage for the gate voltage as Pr decreases and the memory window increases. Since the SS decreased linearly in the memory window, the SS constantly changed according to the ratio of Pr and Ec, Pr/Ec. As the ferroelectric thickness increased, the SS decreased significantly, but the change of SS with respect to the Pr/Ec was severe. In general, as the channel length decreases, SS increases. However, when the Pr/Ec decreased to 10 pF/cm, the SS tended to decrease as the channel length decreased. The reason for this can be attributed to the fact that the relative thickness of ferroelectric increases with small channel length.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"51 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437372","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
Preparation of expandable flake-graphites with different particle sizes and their flame-retardant application for polypropylene 制备不同粒度的可膨胀片状石墨及其在聚丙烯中的阻燃应用
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/17531
Nhung Hac Thi, Thi Thu Hien Nguyen, Truong Cong Doanh, Do Thi Mai Huong, Tien Dat Doan, H. Oanh, Nguyen Duc Tuyen, Mai Ha Hoang
{"title":"Preparation of expandable flake-graphites with different particle sizes and their flame-retardant application for polypropylene","authors":"Nhung Hac Thi, Thi Thu Hien Nguyen, Truong Cong Doanh, Do Thi Mai Huong, Tien Dat Doan, H. Oanh, Nguyen Duc Tuyen, Mai Ha Hoang","doi":"10.15625/2525-2518/17531","DOIUrl":"https://doi.org/10.15625/2525-2518/17531","url":null,"abstract":"Bisulfate intercalated graphites with different particle sizes were prepared by a chemically oxidative method using natural flaky graphites as raw materials. The morphology and structure of the expandable graphites were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction patterns, and scanning electron microscope. The effect of the particle size on the expanded volume was also investigated. Expandable graphite with +100 mesh particle size (EG100) showed the highest expanded volume of 225 mL/g. Moreover, a combination of expandable graphite, red phosphorus (RP), and melamine cyanurate (MC) into a polypropylene (PP) matrix exhibited a synergistic flame retardant effect. The composite loading EG100, RP, and MC with a mass ratio of 1:1:1 and a total filler content of 18 wt.% achieved a UL94 V-0 rating and a limiting oxygen index (LOI) of 28.9 %. The effect of particle size of expandable graphite on the mechanical properties was also evaluated.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"37 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140435911","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
Design, development and evaluation of novel equipment for compost stability tests 设计、开发和评估用于堆肥稳定性测试的新型设备
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/19223
Nguyen Thanh Dam, Nguyen Canh Viet, Phùng Thị Vĩ, Nguyen Manh Huy, Ta Thi Thao, Duong Hong, Anh, J. Vasel, Pham Hung Viet
{"title":"Design, development and evaluation of novel equipment for compost stability tests","authors":"Nguyen Thanh Dam, Nguyen Canh Viet, Phùng Thị Vĩ, Nguyen Manh Huy, Ta Thi Thao, Duong Hong, Anh, J. Vasel, Pham Hung Viet","doi":"10.15625/2525-2518/19223","DOIUrl":"https://doi.org/10.15625/2525-2518/19223","url":null,"abstract":"Compost stability is a significant quality indicator that needs to be determined before using compost as an organic fertiliser. In this work, a novel device for assessing compost stability based on the oxygen consumption (OC) method was successfully developed. The design of this prototype was created to effectively solve inherent limitations observed in commercially available equipment functioning on the same concept (Oxitop devices). The performance of the device was evaluated in the laboratory to determine the OC of two different types of compost samples (food waste and green compost). The data indicated that the device worked stably and accurately during the test. Between the two types of samples, the compost based on food waste had higher AT4 and OCmax values but with lower K values. According to the EU regulations, both types of samples were considered stable.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"24 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437868","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
Physico-chemical properties of macadamia nut shell post-gasification residues and potential agricultural application 澳洲坚果壳气化后残留物的物理化学特性和农业应用潜力
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/18001
Linh Ngoc Vu, Thu Phuong Nguyen, Phuong Thu Le, Thi Mai Thanh Dinh, Hong Nam Nguyen
{"title":"Physico-chemical properties of macadamia nut shell post-gasification residues and potential agricultural application","authors":"Linh Ngoc Vu, Thu Phuong Nguyen, Phuong Thu Le, Thi Mai Thanh Dinh, Hong Nam Nguyen","doi":"10.15625/2525-2518/18001","DOIUrl":"https://doi.org/10.15625/2525-2518/18001","url":null,"abstract":"In–depth information about the characteristics and potential use of post-gasification residues is the key to unlock the sustainability potential of biomass gasification. This study aimed to explicate the physico-chemical properties of residues after the gasification of macadamia nut shell using a commercial gasifier. The results revealed an important amount of carbon content remained in the residues, marking the low conversion efficiency of the process. The obtained residues were deemed unsuitable for use as adsorbents due to low surface areas with non-porous structures. However, the surface of the residues contained multiple carboxyl and hydroxyl functional groups. Also, a remarkable amount of K (up to 86 wt% of the char’s total inorganic elements) was observed to be evenly distributed on the char surface. The results solidified the possibility of utilizing the residues as bio-fertilizers, and provided essential data for the development of sustainable energy production processes using macadamia nut shell for gasification.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"5 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140435892","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
Some new fuzzy query processing methods based on similarity measurement and fuzzy data clustering 基于相似性测量和模糊数据聚类的一些新模糊查询处理方法
Vietnam Journal of Science and Technology Pub Date : 2024-02-23 DOI: 10.15625/2525-2518/18222
Nguyễn Tấn Thuận, Tran Thi, Thuy Trinh, Doan Van Ban, Truong Ngoc, Chau, Nguyen Thi Anh, Phuong, Nguyen Truong Thang
{"title":"Some new fuzzy query processing methods based on similarity measurement and fuzzy data clustering","authors":"Nguyễn Tấn Thuận, Tran Thi, Thuy Trinh, Doan Van Ban, Truong Ngoc, Chau, Nguyen Thi Anh, Phuong, Nguyen Truong Thang","doi":"10.15625/2525-2518/18222","DOIUrl":"https://doi.org/10.15625/2525-2518/18222","url":null,"abstract":"In relational and object-oriented database systems there is always data that is naturally fuzzy or uncertain. However, to deal with complex data types with fuzzy nature, these systems have many limitations. Therefore, in order to represent and manage fuzzy data, it is necessary to have a fuzzy interrogation system to facilitate non-expert users. To solve this challenge, the paper proposes two different approaches to increase the flexibility of the fuzzy interrogation system. Firstly, based on similarity measures and fuzzy logic, we develop three fuzzy query processing algorithms for single-condition and multi-condition cases such as FQSIMSC (Fuzzy Query Sim Single Condition), FQSIMMC (Fuzzy Query Sim Multi-Condition) and FQSEM (Fuzzy Query SEM). Secondly, we combine the fuzzy clustering algorithm EMC (Expectation maximization Coefficient) and the query processing algorithm that is based on fuzzy partitions FQINTERVAL (Fuzzy Query Interval). With this approach, we not only improve query processing cost but also support applications and devices equipped with intelligent interactive function that easily interacts with the fuzzy query system. The results of our theoretical and experimental analysis, it can be seen that both the proposed methods significantly reduce the processing time and memory space for a data set (extracted from UCI) that has a fuzzy and incomplete natural element with the resulting data size being optimal","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"34 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140437096","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 using resistant sensor to predict corrosion under insulation of carbon steel 使用抗性传感器预测碳钢绝缘层腐蚀的研究
Vietnam Journal of Science and Technology Pub Date : 2024-02-22 DOI: 10.15625/2525-2518/17929
Hoang Lam, Nguyen Van Trang, Dinh Thi Duyen, Le Thi Hong Lien, Pham Thy San, Bui Thi, Van Anh
{"title":"Research on using resistant sensor to predict corrosion under insulation of carbon steel","authors":"Hoang Lam, Nguyen Van Trang, Dinh Thi Duyen, Le Thi Hong Lien, Pham Thy San, Bui Thi, Van Anh","doi":"10.15625/2525-2518/17929","DOIUrl":"https://doi.org/10.15625/2525-2518/17929","url":null,"abstract":"Corrosion under insulation (CUI) is very common and severely occurs in chemical/oil and gas industries, however, it is difficult to detect this corrosion by non-destructive testing (NDT) techniques. Carbon steel resistant sensors were used to determine CUI in this research. The output voltage values of the sensor were measured over time and from which the corrosion loss in sensor’s thickness was calculated. Carbon steel samples were exposed to the sensors under the same conditions for the same periods, and the corrosion loss of the samples was determined by weight loss. The results show that when the sensors were corroded within 10-20 % the corrosion loss of carbon steel samples is equivalent to that calculated from the output data of the sensors with a standard deviation of 6-24 %. These results demonstrate the high potential of resistance sensors in determining CUI and predicting damage of industrial components and pipes.","PeriodicalId":23553,"journal":{"name":"Vietnam Journal of Science and Technology","volume":"36 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140440339","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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