bluuebunny/crossref_metadata_2025 huggingface dataset:
Using cellulose binding module of CBM3A as the purification tag for secreted Endoglucanase A (CelA) in Bacillus subtilis
Authors: Nguyen Phuong Hoang Ngoc , Nguyen Phuoc Thanh , Pham Thang Luong , Nguyen Hoang Duc , Tran Thuoc Linh , Pham Trang Thi Phuong
Published: October 2018

Traditional methods of recombinant protein purification are uneconomic and inconvenient to the secreted proteins at large-volume. CBM3a, a module from cellulosome’s scaffoldin of Clostridium thermocellum, directs the binding of the cellulase complex on the cheap cellulose substrate. Most of previous studies about CBM3a fused with cellulases as the purification tag were conducted in intracellular Escherichia coli system. In this research, we used the extracellular Bacillus subtilis WB800N expression system to investigate the CBM3a-tag fused with endoglucanase CelA into plasmid pHT. The results indicated that protein CelA was secrected and purified by CBM3a-tag binding on the Regenerated Amorphous Cellulose (RAC) subtrate. This can be used for further improvement in protein purification tag designing.
Effect of plant hormones on the in vitro culture of breadfruit shoots (Artocarpus altilis (Park.) Fosberg)
Authors: Ha Suong Thi Tuyet , Vo Mai Thi Bach
Published: October 2018

Under the influence of plant hormones, after 8 weeks of in vitro culture, the growth of breadfruit shoot (Artocarpus altilis (Park.) Fosberg) was very different. With shoots that were cultured on 1 mg/L BA medium after 10 days of being transferred to ½ MS supplemented with 10 mg/L BA medium, the percentage of shoot development was the highest (86.8 %), and the secretion of phenolic compounds or forming callus were not observed. On the ½ MS supplemented with 12 mg/L BA medium, shoots growed strongly and healthily but the secretion of phenolic compounds and the forming of callus affected the ability of the shoot development. On the ½ MS supplemented with 0.45 mg/L BA, 0.6 mg/L Kinetin (Kin) medium and on the ½ MS supplemented with 0.45 mg/L BA, 0.6 mg/L Kin, 0.35 mg/L GA3 medium, the percentage of shoot developed were lower than those on the ½ MS supplemented with 10 mg/L medium. The addition of 0.35 mg/L GA3 in the culture medium help to appear the lateral more than the remaining experiments. Roles of respiration rate and endogenous hormones were discussed to understand the physiological changes in the in vitro culture shoots breadfruit.
Hairy root induction in Catharanthus roseus by various strains of Agrobacterium rhizogenes isolated in Vietnam
Authors: Nguyen Nhut Nhu , Bui Le Van
Published: October 2018

Catharanthus roseus is a well known medicinal plant. It produces several phytocompounds and many of which show anticancerous properties. However the yields of these compounds are very low. Recently, induction of C. roseus hairy roots by Agrobacterium rhizogenes, is interested as a promising tool for the enhanced production of these metabolites. In this research, wounded leaves from four strains of C. roseus were infected with various strains of A. rhizogenes isolated in Vietnam to provide more information about the induction efficiency of hairy roots. In this experiment, after 3 weeks of infection, the presence of rolB gene in hairy roots were analysed by polymerase chain reaction. All of 13 A. rhizogenes strains could induce the formation of hairy root in C. roseus. The A. rhizogenes C18 strain had the highest induction percentage in C. roseus VIN002, VIN005, and VIN072 with 59.4 %, 50.3 %, and 40.0 % respectively. And the same result was ontained at 26.7% by A. Rhizogenes C26 for C. roseus VIN077 rhizogenes strains. This result identified two A. rhizogenes strains C18 and C26 as potential transformation tools for hairy root production from C. roseus.
Gene cloning and transformation of Arabidopsis plant to study the functions of the Early Responsive to Dehydration gene (ERD4) in coffee genome
Authors: Nguyen Sy Dinh , Kang Hunseung
Published: October 2018

Coffee plant is one of the most important industrial crops, and the two popular cultivars, Coffea arabica and Coffea canephora, contribute to the production of almost all coffee beans around the world. Although the demand for coffee beans is continually increasing, the steady production of coffee beans is hampered by many factors, such as environmental stresses, insect pests, and diseases. Traditional breeding could be used to develop new coffee cultivars with a higher productivity under these harsh conditions, and a biotechnological approach can also be used to improve coffee plants in a relatively short period of time. To develop new coffee cultivars via a biotechnological approach, it is necessary to discover potential candidate genes and determine their functions in coffee plants. However, it is technically difficult to introduce foreign genes into coffee genome and takes long time to analyze gene function in coffee plants. To overcome these technical difficulties, the potential coffee genes could be cloned and introduced into Arabidopsis for the rapid analysis of its biological functions under harsh environmental conditions.
Stochastic differential of Ito – Levy processes
Authors: Duong Dam Ton , Nguyen Phung Ngoc
Published: October 2018

In this paper, we continue to expand some results to get the product rule for differential of stochastic processes with jump, and apply for some special processes like pure jump process, Levy-Ornstein-Uhlenbeck process, geometric Levy process, in models of finance, ecomomics, and information technology.
Clonning and expression of recombinant carbapenemase KPC-2 enzyme in E. coli cytoplasm
Authors: Tran Phuong Nhat , Huynh Phuong Thi Kim , Tran Trang Thi Phuong , Tran Thuoc Linh , Pham Van Hung
Published: October 2018

Production of KPC-type carbapenemase is the most common carbapenem resistant mechanism in Klebsiella pneumoniae. The expression level of KPC in these strains is different and is mostly required other mechanisms to reach the higher resistant level such as porin lost or co-expression of extended spectrum β-lactamase (ESBL). To better understand the expression of KPC enzyme, the KPC-2 encoding genes from clinical isolated K. pneumoniae were cloned into pET28a plasmid. The recombinant plasmids containing of kpc-2 gene were subsequently transformed into E. coli OmniMax and were screened in kanamycine added LB media to select E. coli possessing of recombinant plasmid. Carbapenemase activity in the broth culture was checked in LB broth supplemented with 4 µg/mL of ertapenem and the expression induced with IPTG was checked by SDS-PAGE method. The results showed that this recombinant vector was capable of effective expression of KPC-2 protein in E. coli and this strain could be grown in LB broth supplemented with 4 µg/mL of ertapenem. A half of the target protein was soluble in the supernatant however it could be successfully collected from a HistrapHP affinity chromatography column. The result of this report is one of resources for further studies and applications of this KPC-2 protein in clinical research.
Hairy induction from Impatiens balsamina L. using fourteen Agrobacterium rhizogenes strains
Authors: Phan Hai Trung , Quach Phuong Ngo Diem , Nguyen Nhut Nhu
Published: October 2018

Impatiens balsamina L. is a plant commonly grown in Vietnam. It has long been used as traditional medicine. All of the secondary metabolites produced by Impatiens balsamina L. root possessed biological activities. The main advantage of using hairy root cultures is their ability of growing fast in defined basal media without supplementation of phytohormones. The aim of this research is to invest some factors that could affect on the hairy root production such as A. rhizogenes strain, type of tissue, OD concentration, immersion time and co-cultivation time. The results showed that 3 strain A. rhizogenes C02, C18 and C26 isolated from nature in Vietnam could induce the best hairy root formation at the 0.5–1.0 OD concentration bacteria with 5’ of immersion time and 72 hours of co-cultivating. Among them, C02 is the strain that could offer the best result in B5 medium
Study to extend the vase life of cut rose (Rosa hybrida L.) flowers
Authors: Tran Hong Thi Hoa , Bui Viet Trang
Published: October 2018

This study investigated anatomic and physiologic changes during senescence to improve the vase life of cut rose flowers. When holding the flowers in the distilled water, the fresh weight increased in the 2nd day, and decreased in the following days. In progressing flower senescence, there were decreases in water uptake, dry weight, rate of photosynthesis, and concentration of auxin, gibberellin and zeatin, while the ionic conductance, and ABA concentration increased. The rate of respiration increased until the 3rd day, and then decreased. The UV absorption curve of the petal extract showed two peaks at 446 and 665 nm. The absorbances was the highest in the 1st day then decreased in the following days. Among the treatments, the combination of 10 mg/L BA, 1 mg/L GA3 and 0.1 mg/L NAA, and the combination of 10 mg/L BA and 0.1 mg/L NAA gave a vase life for cut roses 2 days longer than that of the control.
Microwave-assisted intramolecular FriedelCrafts acylation of some aryl aliphatic acids using Gd(OTf)3/ [BMI]BF4 catalytic system
Authors: Tran Phuong Hoang , Huynh Vy Hieu , Tran Hai Ngoc , Le Thach Ngoc
Published: October 2018

Intramolecular Friedel–Crafts acylation of aryl acids is a “green” reaction and environmentally benign, generates some valuable intermediated compounds for pharmaceutical uses. In addition, metal triflates under microwave irradiation are efficient catalysts, solving many problems when using traditional Lewis acids. Gd(OTf)3/[BMI]BF4, a good catalyst for the intramolecular Friedel–Crafts acylation under mild condition with high yield, reduced the reaction time and pollution. Furthermore, Gd(OTf)3 in [BMI]BF4 was easily recovered and reused without significant loss of its activity
The continuous wavelet transform in processing data of high frequency electromagnetic prospecting
Authors: Duong Tin Quoc Chanh , Duong Dau Hieu , Nguyen Van Thanh , Nguyen Thuan Van
Published: October 2018

Ground Penetrating Radar (GPR), a high frequency electromagnetic prospecting method (10 to 3000 MHz) has been rapidly developed in recent decades. With many advantages such as non-destructive, fast data collection, high precision and resolution, this method is a useful means to detect underground targets. It is currently used in the research of studying the shallow structure for examples: forecast landslide, subsidence, mapping urban underground works, traffic, construction, archaeology and other various fields of engineering, GPR data processing is becoming increasingly urgent. Wavelet transform is one of the new signal analysis tools, plays a vital role in numerous domains like image processing, graphics, data compression, gravitational, electromagnetic and geomagnetic data processing, GPR and some others. In this study, we used the continuous wavelet transform (CWT) and multiscale edge detection (MED) with the wavelet functions which were appropriately selected to determine underground targets. The accuracy of this technique was tested on some theoretical models before being applied on experimental data. The obtained results showed that this was a feasible method that could be used to detect the size and position of the anomaly objects.
Organization of the Republic-of-Vietnam Military Forces in the 1969-1975 period via Saigon government documents
Authors: Vu Anh Quy Tung
Published: October 2018

By codifying the documents of the Republic-of-Vietnam government kept at the National Archives Center II (NACII), the author will redraw the organization of the Republic of Vietnam Military Forces in the 1969-1975 period. This reconstruction will help the author and researchers to have a full overview on military tools – Republic-of-Vietnam Military Forces during the war of American in Southern Vietnam and on the process of Vietnamese people’s fighting against a modern army trained and commanded by U.S. Army.
Saigon in the process of South Vietnam’s integration into the area in nineteenth century
Authors: Tran Thuan
Published: October 2018

From the beginning to open up the southern land, Saigon has soon represented as the center of the whole Southern with a strong pervasion. Saigon has also received the influence of Western Civilization in order to urbanize rapidly. In the nineteenth century, Saigon had a strong integration and became the motive force in leading the South Vietnam to integrate into the area and the world. The French colonialism invaded Gia Dinh and invested to establish Saigon as the administrative centre, the capital of Southern. They turned Saigon into the international trade center. Saigon changed its look and quickly became “Pearl of the Far East”.
The horizontal lacquered boards and couplet tablets at Trung Hoa Huiguans in Hoian, Quangnam
Authors: Vo Tuyet Thi Anh , Dao Hop Vinh
Published: October 2018

During the 17th-18th centuries, Hoian gradually became an urban centre and a prosperous trade-port. At that time, the Hoa people settled in Hoian and built five huiguans consisting of Phuc Kien Huiguan, Trung Hoa Huiguan, Quang Dong Huiguan, Quynh Phu Huiguan and Quang Trieu Huiguan. The Huiguans are extremely special buildings with high historic and cultural values. It marks the notable stages of the Hoa’s immigrating and settling in Hoian and reflects the up-and-down stages of this land. Horizontal lacquered boards and couplet tablets are special items in these Huiquans. It conveys to us the message from history, the value of handicrafts in such aspects as archaeology, Han-Nom, society, culture, chirography, literature, etc. They also express Hoianese’s spirit life, offerers’ and skilled workers’ concept and art standards handed on to future generations. Trung Hoa Huiguan is that of the Five Bangs (one type of congregations the Hoa people in Vietnam) in Hoian. This Huiguan was built in the early 18th century and took an important role in the Hoa’s history of settling in Hoian. At present, in the most formal spaces of the Huiguan, many horizontal lacquered boards and couplet tablets are hanged up for display and worship. The Huiguan’s special tradition and uniquities needs to be conserved and researched since it provides materials for full research works on the Hoa people and on the history of Hoian in general.
The process of formation and development of the economic innovation path in Vietnam (1986-2015)
Authors: Vo Sen Van , Duong Thong Thanh
Published: October 2018

The collapse of the socialist regimes in Soviet Union and Eastern European socialist countries in the late 20th century was that of an inappropriate socialist model. In Vietnam after the unification of the nation, coping with the requirements posed by the socio-economic context of the country, the Communist Party of Vietnam worked out the leading path for the innovation mission in a comprehensive manner, which was firstly the economic innovation focusing on the transformation from the centrally planned economy into the socialist-oriented market economy; along with the “open-door” policy and the international integration policy. The foundation of the innovation was a process summed up from the reality of the then socio-economic life, from costly lessons from the socialist model as well as reforms and reshuffling in socialist countries. This paper presents the process of formation and development of ways of thinking, paths of economic innovation in Vietnam from the perspective of successes and lessons learned.
Developing spiritual tourism in An Giang province
Authors: Nguyen Thanh Van , Nguyen Vu Quang
Published: October 2018

Spiritual Tourism is a new development trend of tourism in many countries nowadays. Developing spiritual tourism not only brings socio-economic efficiency, creates jobs, improves literacy levels but also preserves and promotes many cultural-belief values of local community. An Giang, known as one of the most interesting destinations of MeKong Delta, has many beautiful scenes, historical monuments, especially many religious places. Therefore, this is the key to take advantage of tourism resources in An Giang. However, developing spiritual tourism here is not as well as its own potential. In this paper, we want to list some problems that local community has to deal with; then, giving some tips for the development of An Giang’s spiritual tourism.
Development potential of experiential tourism in Son Tra peninsula – Da Nang City
Authors: Tran Minh Duy , Pham Thien Duc
Published: October 2018

Tourism product diversification is an essential need aiming to increase the attractiveness and effectively promote tourism potential for Son Tra peninsula, Da Nang City. In can-be-applied methods, the development of experiential tourism forms has numerous favorable advantages. Based on the understanding of the basic principles of the mentioned-above tourism forms, combining with the evaluation of the conditions in practice, the paper proposes some specific contents to implement experiential tourism in terms of nature and social culture for visitors to Son Tra peninsula. As a typical case, this deployment model can be applied to many other destinations in Vietnam where similar potentials and conditions are found.
Economic development of sea-island tourism attached to the assurance of defense and security in the current context of integration
Authors: Nguyen Dung Tuan
Published: October 2018

The current complicated movements of the East Sea raise the issue of closely linking the economic development of sea-island tourism to the assurance of defense and security. In fact, the linking of these two fields has been done, obtaining certain results; however, in some places sometimes, the effectiveness of this connection is still limited. On that basis, the paper suggests some solutions which exert closer links between the economic development of sea-island tourism and the assurance of defense and security in the current context of integration in Vietnam.
Event-based river tourism product diversification (Lessons learned of South Korea for river tourism in Bien Hoa City, Dong Nai Province)
Authors: Duong Hien Thi Huu , Nguyen Hiep Trung
Published: October 2018

In company with the trendily emergence of nature-based tourism and unique experiences in recent years, river tourism has been getting favoured. Being a form of water-based tourism, it is operated at natural freshwater flows in the countryside as well as in urban regions. In Bien Hoa City (Dong Nai), although Dong Nai River is demonstrated considerable potentials, river tourism has not developed yet by dint of lack of typical river tourism products which strongly affect competitive destination. Hence, “breathing life”of cultural and historical values into material flows is worth being considered an optimal solution. Accordingly, this paper will examine lessons learned of South Korea in organizing events to explore tourism which are suggested to be applied into Bien Hoa City case study.
Exploiting tourism products of Ly Son island from a cultural geography approach in the context of integration
Authors: Ngo Long Hoang Dai
Published: October 2018

Geo-cultural products are the ones of geography and history and always bear contemporary imprints of culture. Nowadays, many cultural products are produced to serve life and tourism development. The tourism products made from culture result from the achievements of geo-cultural heritage which is the identity of Ly Son island. This paper clearly analyzes this content.
Innovating university tourism curriculum to meet the challenge of free labour movement in ASEAN
Authors: Vo Lan Sang Xuan , Doan Hanh Thi My
Published: October 2018

In order to encourage cooperation in many aspects within the area, on August 9, 2016, the Association of Southeast Asian Nations (ASEAN) officially announced Mutual Recognition Arrangement on Tourism Professionals (MRA-TP). As such, from then the tourism labour forces of member countries have more job opportunities but also face more challenges because of competition within the area. In this context, training tourism labour force becomes a challenge and thus requires innovations to adapt to important changes in the labour market. This paper focusses on analyzing several university tourism programmes at the undergraduate level in Singapore, Malaysia, Thailand, etc. in order to suggest improvements for tourism programmes in Vietnam, which can assist Vietnamese labour force in integrating into the area.
Rural tourism development potential in Tan Trieu islet, Dong Nai Province
Authors: Hoang Chau Ngoc Minh , Tran Minh Duy
Published: October 2018

Tan Trieu Islet, Dong Nai province not only is known as an area specializing in pomelo very popular all over the country, but also has many advantages for exploiting rural tourism potential in order to diversify tourism products and enhance the added value of pomelo in the region. This paper investigates the potential of developing rural tourism in Tan Trieu islet based on the foundation of the establishment and development of rural tourism. Hence, the paper suggests some specific types for effective exploitation of rural tourism potential in Tan Trieu pomelo Islet.
Studying the meeting of practical requirements of ecotourism in the Can Gio Mangrove World Biosphere Reserve, Ho Chi Minh City
Authors: Ngo Loan Thanh
Published: October 2018

Ecotourism is considered as a pre-eminent form of tourism that helps to balance economic purpose and conservation of natural and cultural values of the area. However, in order to conduct efficient ecotourism activities, besides a specific ecosystem, the locality must have proper human resources as well as responsible tourists. This paper presents some findings from our research on how the labors’ planning and working for ecotourism spots in Can Gio to meet the requirements of ecotourism. A survey with tourists was also realized. The result raises some concerns about the sustainability of ecotourism in Can Gio.
Tourism products of the grapefruit garden on Bach Dang peninsula, Tan Uyen town, Binh Duong province
Authors: Nguyen Cuc Thu
Published: October 2018

Sustainable tourism development is often based on the existing strengths of the local. Bach Dang peninsula, Tan Uyen town, Binh Duong province has the advantage of orchard availability. Among them, the grapefruit on Bach Dang not only is a brand well known in the southern plains but also grows nationwide. With the objective to take advantage of Bach Dang grapefruit products for local tourism development, this study aims to investigate, analyze the tourism product of the grapefruit garden on Bach Dang peninsula. At the same time, the paper considers the combination with other travel-related products based on the understanding and evaluation of the parties involved in tourism activities to create the foundation to conduct a specific strategy for the practical implementation to reasonably and effectively develop tourism on Bach Dang peninsula.
Tourism-personalizing trend – development premises and strategic recommendations
Authors: Pham Nguyet Thi Thuy
Published: October 2018

The paper analyzes the tourists’ changing habits in the context of new media strongly growing, allowing tourists to customize their decisions and choices. This trend is identified as personalized trends in modern tourism. There are five premises of tourismpersonalizing trends including global information connecting; metadata development; impacts of online trading software; mobility and the online skills of Millenials. The paper also discusses the aspects of adaptive strategy of tourism in this context.
Vietnam tourism culture in the period of international integration
Authors: Vo Thanh Van
Published: October 2018

International integration is a main feature of the world. Currently, we are active and proactive in terms of international integration in many aspects, including tourism. In the field of tourism, international integration not only provides many opportunities but also poses big challenges. We must actively take advantage of opportunities and limit challenges. Tourism is an economic sector with profound cultural connotations, and international integration has a strong and direct impact on tourism. In this paper, we would like to discuss two main points: Firstly, what is tourism culture? Secondly, the role and significance of cultural exchanges for the development of Vietnam tourism in the international integration period.
Impact of effective internal control system and information technology on the quality of accounting information system of enterprises in Ho Chi Minh city
Authors: Nguyen Binh Huu
Published: October 2018

This study was conducted to examine impact of effective internal control system and information technology on the quality of accounting information system. Data are collected from a survey on 192 accountants, managers, and employees who operate and manage information systems in HCMC in 2014. The author used Cronbach’s Alpha coefficients, EFA methods to assess the reliability, value of scale, and linear regression analysis to test hypotheses. The results of the study show that the quality of an accounting information system is influenced by the effectiveness of internal control system as well as the application level of IT in accounting. These results are expected to offer managers a basis for establishing a quality accounting information system that provide users with quality accounting information.
Trans - Pacific Partnership (TPP) Agreement and Vietnam’s Husbandry - Practice and Necessary Preparations
Authors: Nguyen Dung Tien , Mai Hop Quang
Published: October 2018

Trans - Pacific Partnership Agreement (TPP) is a high-standard free trade agreement with a far-reaching influence in many important sectors of the economy. This Agreement is considered as the agreement of the 21th century. Vietnam has a lower development level compared with the remaining 11 countries. Therefore, accession into TPP brings about plenty of opportunities to Vietnam as well as great challenges. The opportunities and challenges in sectors are also different as their competitive advantages are varied. Agriculture has always been one of the three pillars of the economy. Seafood is expected to have the greatest advantage while husbandry is the weakest and lagged behind other countries in PPP. The husbandry needs extensive and drastic restructuring to develop and integrate into the common market. From the analysis, the author offers some suggestions for the husbandry in the international integration era.
Competitive analysis of Vietnam dairy industry
Authors: Nguyen Hien Thi Dieu
Published: October 2018

Vietnam dairy industry has gained an impressive growth both in value an volume in the recent years. The domestic dairy market has advantageous conditions for development (e.g. the rapid increase in consumer demand, size of dairy enterprises or the expansion trend in cow breeding industry etc.). However, the domestic dairy industry are faced with multiple disadvantageous conditions that constrain the development potential (e.g. the irrational demand of consumers and inconsistency in management of authorities etc.) The author employs Porter’s diamond model to analyze 4 factors, including i) Factor conditions; ii) Related and supporting industries; iii) Demand conditions and; iv) Firm strategy, structure and rivalry. Results shows that the Vietnam dairy industry owns competitive advantages and potential for development. This research provides stakeholders with an overview of competitive advantages of the Vietnam dairy industry, thereby having suitable strategies.
Factors influencing consumers’ attitude in E commerce
Authors: Nguyen Huong Hoang Diem , Nguyen Minh Thi Binh , Nguyen Tram Ngoc Bich
Published: October 2018

The study investigates key factors that affect consumers' attitude towards shopping online and examines its influence on online shopping behavior. A model with six independent variables including Financial risk, Product risk, Convenience risk, Non-Delivery risk, Return risk, Service and Infrastructure is utilized. Data were collected from 500 online shopping consumers in three cities, namely Ho Chi Minh, Ha Noi and Da Nang. Results show that all six independent variables are statistically significant in explaining consumers' attitudes towards online shopping, in which consumer perception about service and infrastructure is the most significant, with positive effect. On the contrary, consumer perception about Financial risk has a negative effect on the attitude. The findings also reveal the positive role of attitude in encouraging online shopping behavior.
Detection of real earnings management: The case of Vietnamese listed companies
Authors: Nguyen Loan Thi Phuong , Nguyen Thao Minh
Published: October 2018

There are a great number of incentives that drive managements to manipulate firms’ profit. Beside exploiting the allowed discretional accrual choices, managers could perform real earnings management by altering the normal operating scale of the companies. This paper examines the three most prevalent means of real earnings management, including (1) boost in sales through price discounts or more lenient credit terms; (2) reduction of discretional expenses and (3) overproduction. The main concentration of the study is the applications of these measures to avoid losses. By using data of 610 listed companies on Ha Noi and Ho Chi Minh Stock Exchange from 2008 to 2015 and verified regression models, the research finds evidence that managers do apply real earnings management to avoid losses. These findings are consistent with other researches’ result. Based on the empirical result, the paper raises recommendations to enhance the profit’s reliability and protect investors.
Factors affecting the satisfaction of companies on service quality in industrial zones in Ho Chi Minh City
Authors: Do Tinh Phu Tran , Nguyen Nen Van
Published: October 2018

The research focuses on exploratory analysis of factors that affect the satisfaction of companies on service quality in industrial zones in Ho Chi Minh City. In addition, regression analysis is implemented to measure the impact of these factors on companies’ satisfaction. The exploratory analysis indicates that four factors that determine service quality of industrial zones in Ho Chi Minh City are: (i) tangibility; (ii) service attitude of the managers and the industrial zones’s investors; (iii) responsiveness; and (iv) empathy. The regression estimation shows that the four factors above affect the satisfaction of companies in the same direction. In particular, tangibility and service attitude of the managers and the industrial zones’s investors have the strongest impacts. These important findings can serve as a ground for industrial zones in Ho Chi Minh City to make appropriate adjustments and for industrial zones which are about to come into operation to have necessary preparations in order to better meet requirements of companies.
Improving mechanical properties of multi-walled carbon nanotube/epoxy composites through a simple stretch-drawing method
Authors: Tran Nam Huu , Vu Hung Minh , Pham Quang Hong
Published: October 2018

Horizontally aligned multi-walled carbon nanotube (CNT) sheets were produced from vertically aligned CNT arrays using drawing and winding techniques. Composites based on epoxy resin and an aligned 100-ply CNT sheet have been developed using hot-melt prepreg processing. However, wavy and poor-packed CNTs in the sheets have limited reinforcement efficiency of the CNTs in the composites. In this study, a new simple stretch-drawing method was used to modify the structures of the aligned CNT sheets for improving the composite properties. The stretch-drawing of the CNT sheets enhanced the composite properties considerably. The improved properties of the composites originated from straightening of the wavy CNTs and increasing the CNT dense packing in the composites. With a 3% stretch ratio, the aligned CNT/epoxy composites achieved their best mechanical properties in this study. The 3% stretched composites exhibit increased tensile strength by 113% and enhanced elastic modulus by 34% compared to non-stretched ones. Results show that the simple stretch-drawing is effective to produce highly aligned CNT sheets for the development of high-performance CNT composites. Compared to our previous stretching method, the stretch-drawing method in this study is more effective in improving the mechanical properties of aligned CNT/epoxy composites.
New adaptive droop control with combined line impedance estimation method for parallel inverters
Authors: Le Phuong Minh , Hoang Duy Vo Duc , Pham Hoa Thi Xuan , Nguyen Huy Minh
Published: October 2018

This paper presents a new load sharing control between paralleled three-phase inverters in an islanded-microgrid based on the line impedance estimation online by the use of the Kalman filter. We can solve the mismatch of power sharing when the line impedance changes due to the temperature and frequency, significant differences of line parameters and requirements of Plug-and-Play mode of inverters connected to the microgrid. Moreover, the paper also presents a new Droop control method working with the line impedance which is different from the Droop traditional algorithm when the line impedance is assumed pure resistance R or pure inductance X. In the paper, the line impedance estimation for parallel inverters uses the least squares method combined with Kalman filter. In addition, secondary control loops are designed to restore the voltage amplitude and frequency of the microgrid by using a combined nominal value SOGI-PLL with generalized integral block and phase lock loop to exactly monitor the voltage magnitude and frequency phase at common PCC. Control model has been simulated in Matlab/Simulink with three voltage source inverters connected in parallel for different ratios of the power sharing. The simulation results have shown the accuracy of the proposed control method. Therefore, the proposed adaptive droop control method based on line impedance estimation can be an alternative one for load sharing control in islanded microgrids.
Study of boosting gamma-Aminobutyric acid (GABA) content in germinated mung bean under hypoxia-anaerobic condition and evaluating the loss of GABA after boiling
Authors: Truong Trung Nhat , Dong Dao Thi Anh
Published: October 2018

In this study, we investigated some factors effected on GABA stimulation under hypoxia-anaerobic condition and evaluated the loss rate of GABA amount after boiling and drying. These factors include pH soaking water, temperature and time germination. We also carried out the germinated optimization based on above factors. The results showed the optimal conditions included: temperature was 36.6oC, time was 14.5 hours and pH was 5.83. The highest GABA was 1638.67ppm and higher 27.55 times than raw material. Seeds (after germinating) were boiled at 80oC in 15 minutes and dried at 50oC in 3 hours. Finally, we ground it to recover the germinated mung bean powder which moisture content was 6.13% and GABA content was 273.76ppm - 4.6 times higher than the raw powder.
Stability and activity of TG25P phage in control of Aeromonas hydrophila in striped catfish pond water
Authors: Xuan Tran , Hoang Hoang Anh , Tam Le
Published: October 2018

Introduction: Striped catfish (Pangasianodon hypohthalmus) is a native freshwater fish species in the Mekong Delta, Vietnam, and significantly contributes to national aqua exports. Currently, however, the sustainable development of striped catfish farming is being affected by bacterial pathogen infections, of which hemorrhagic septicemia caused by Aeromonas hydrophila bacteria is one of the most common diseases.
Methods: In this study, the stability of TG25P and CT45P phages to factors such as temperature, pH, and organic solvents was investigated, with the stability of TG25P being found to be higher than that of CT45P.
Results: The activity of TG25P was retained to approximately 90% and 80% at 37oC and 50oC for 1 h, respectively. Its activity was maintained to greater than 80% at pH 5-9 for 24 h and approximately 90-100% in organic solvents, such as chloroform or diethyl ether, for 1 h. In addition, the stability and activity of TG25P for the control of A. hydrophila in striped catfish pond water was also evaluated for 48 h.
Conclusion: TG25P was found to be highly applicable in the creation of low-cost phage-containing products for the prospective application of phage therapy in prevention and treatment of hemorrhagic septicemia in striped catfish.
Primary Appendix Lymphoma: Case Report and Review of the Literature
Authors: Ardicli Burak , Karaman Ayse , Yesil Sule , Arda Nilufer , Sahin Gurses , Ozguner Ismet Faruk
Published: October 2018

Appendectomy is the most frequent emergent surgical procedure in childhood. Carcinomas are the most frequent neoplasms in the appendix, other neoplasms such as carcinoid tumors and lymphomas may seen less frequently. Primary tumors of the appendix are very rare. We report a patient presented with acute appendicitis diagnosed with B-cell lymphoma after pathological examination.
A Comparison of Thiol/Disulphide Levels of Workers in Operating Rooms and Emergency Healthcare Centers
Authors: Ethemoglu Filiz Banu , Yilmaz Hidir , Kavalci Gulsum , Akman Cem , Terzioglu Nurkan , Sahin Kavakli Havva , Erel Ozcan , Senat Almila , Koca Ayca
Published: October 2018

Objective: Thiol/disulphide homeostasis has a crucial role for life. The aim of this study was to compare thiol/disulphide homeostasis in healthcare professionals working in the operating room (Group 1) and healthcare professionals working in the emergency department (Group 2).

Materials-Methods: This was a descriptive study. Fortynine operating room volunteers (Group 1) and 49 emergency department volunteers (Group 2) were included in this study. Thiol and disulphide concentrations were measured using the novel automated measurement method developed by Erel & Neşelioğlu in 2014.

Result: The thiol/disulphide levels were compared in both groups; Native thiol in group 1 was 353,57 ± 49,86 μmol.L-1, and it was  333,73 ± 37,38 μmol.L-1 (p = 0.028) in group 2. total thiol values were 384,71 ± 52,36 μmol.L⁻¹ and 370,94 15,56 ± 5,36 μmol.L-1(P =0,133), respectively in group 1 and 2. In group 1,disulphide levels were  15,56±5,36 μmol.L-1,  in  group 2 it was  18,61 ± 7,71 μmol.L-1 (p = 0,025), disulphide/native thiol in  group 1 was 4,47 ± 1 %, and in  group 2 it was measured %, 5,73 ± 2,95% (p = 0.009). Disulphide/total thiol in the group 1 was 4,06 ± 1,32% and 5,03 ± 2,13% (p = 0,008) in group 2. Native thiol / total thiol levels were 90,23 ± 12,16% in group 1  and 89,93 ± 4,26% in  group 2 (p = 0,871). Native thiol level in group 1 and high level of disulphide in group 2 indicate that the exposure to oxidative stress in the emergency department is higher than in the operating room.

Conclusion: Our results show that participants of emergency room group have statistically higher levels of disulphide than participants working in operating room which may suggest presence of oxidative stress related with workplace exposures.

 

Key Words: Health personnel, oxidative stress, thiol/disulphide homeostasis.
Risk Factors for Colonisation or Infection with Carbapenem Resistant Escherichia Coli and Klebsiella Pneumoniae
Authors: Atmış Volkan , Gumussoy Mesut , Cinel Murat , Canlar Sule , Cetinkaya Sardan Nadire Yesim
Published: October 2018

Objective: Since 1991, carbapenem resistance is being reported in an increasing fashion worldwide. It is expected to increase due to increasing frequency of international travels. Carbapenem resistant Escherichia coli and Klebsiella pneumoniae can cause colonization or clinical infection. Treatment of carbapenem resistant Escherichia coli or Klebsiella pneumoniae is not precise and we have limited choices of antibiotics. This brings increasing morbidity and mortality with itself. We aimed to find out risk factors for colonization or infection with carbapenem resistant Escherichia coli and Klebsiella pneumoniae in this study.

Materials and Methods: With the decision of Adult Hospital Infection Control Comittee, a surveillance has been started among adult patients (>18 years of age) at Hacettepe University Hospitals at June 2009. A perianal swab culture has been obtained weekly by Adult Hospital Infection Control nurses from patients included in surveillance program. In this study, carried on adult patients hospitalized at Hacettepe University hospitals between 01.06.2009-31.12.2010, risk factors for colonization or infection with carbapenem resistant Escherichia coli and Klebsiella pneumoniae, those are detected via surveillance cultures or clinical specimens, were investigated.

Results: According to results of the multivariate analysis of the study; being hospitalized in an internal ward (any ward other than a surgical ward) (p=0,005), Diabetes Mellitus (p=0,010), immunosuppression (p<0,001), hospitalization history  (p<0,005), burn history (p=0,026), central venous line history (p=0,012), arterial line history (p=0,010), feeding or nasogastric tube history (p<0,001), sulbactam/ampicillin use (p<0,001), glycopeptide use (p=0,003) and carbapenem or piperacillin/tazobactam use (p<0,001) were all detected to be risk factors.
Topological defects in active liquid crystals
Authors: Aranson I S
Published: October 2018

A wide class of nonequilibrium systems comprising interacting self-propelled agents is termed active matter. The most relevant examples include suspensions of microscopic swimming organisms (bacteria, sperm cells, or unicellular algae), synthetic catalytic nanomotors, colloidal self-propelled Janus particles, and even macroscopic bird flocks, fish schools, or human crowds. The simplest and most studied realization of active matter is a suspension of microscopic swimmers, such as motile microorganisms or self-phoretic colloids. A liquid crystal, a highly-structured anisotropic environment with local molecular ordering ‘doped’ by a small amount of active component represents an interesting class of nonequilibrium materials with novel optical and mechanical properties. Singularities of local molecular orientation, or topological defects, play an important role in the spatiotemporal organization of active liquid crystals. This study surveys the most recent experimental and theoretical advances in the field of active liquid crystals and highlights connections with other nonequilibrium physical and biological systems.
SiC-based electronics (100th anniversary of the Ioffe Institute)
Authors: Lebedev A A , Ivanov P A , Levinshtein M E , Mokhov E N , Nagalyuk S S , Anisimov A N , Baranov P G
Published: October 2018

We review the history and modern state of silicon carbide and SiC-based devices. The main techniques for growing bulk SiC crystals and epitaxial SiC films are discussed. Epitaxial SiC structures used for post-growth processing are briefly reviewed. The state of the art achieved in developing SiC devices is presented. The main problems that occur in developing SiC equipment and prospects for designing and developing such equipment are analyzed.
Former une kumpania . Composition et recomposition des collectifs roms de Provence
Authors: Foisneau Lise
Published: October 2018

Les kumpanji de Roms dits Hongrois s’assemblent et se désassemblent dans un habile tissage qui entrelace les relations entre les personnes et la circulation entre les lieux. Les déplacements permettent tout à la fois de préserver la vie collective et de donner à cette dernière de nouvelles configurations. À travers l’étude de deux formes d’habitation, celle des aires d’accueil et celle des « places », cet article entend montrer, d’une part, comment, à chaque arrivée, se crée un nouvel assemblage des relations et, d’autre part, comment les différents modes de l’occupation de l’espace déterminent une position de soi dans un territoire hétérogène régi par le droit de propriété et les contraintes administratives qui l’accompagnent.
Interprétations du mariage précoce dans le système juridique en Angleterre. Retour sur une expérience d’expertise
Authors: Stewart Michael
Published: October 2018

À partir d’une expérience d’expertise auprès du tribunal, en tant qu’anthropologue, pour une affaire de mariage précoce au sein d’une famille de migrants roms, cet article s’intéresse à la place de l’expert et au conflit juridique entraîné par son intervention. En mobilisant la notion empruntée à Emmanuel Todd de « famille communautaire endogame », la réflexion menée ici explore la question de l’articulation entre tradition, autonomie et choix, et les possibilités de changement social. Dans le même temps, l’article s’inscrit dans les débats de plus en plus riches et diversifiés à propos de la relation complexe entre le savoir académique et le raisonnement juridique.
La société des Manouches de Paris au xix e siècle. Autour de quelques explorations ethnographiques de Paul Bataillard
Authors: About Ilsen
Published: October 2018

Cet article étudie les archives de Paul Bataillard (1816-1894), composées de documents sur l’histoire des Bohémiens en Europe et de traces issues de ses rencontres avec les Manouches de Paris entre les années 1840 et 1880. Ces matériaux sont analysés comme des sources ethnographiques qui documentent la diversité et les évolutions sociales du milieu manouche à Paris. Le contenu de ces archives permet d’accéder aux conditions d’une enquête de terrain et fait apparaître les jalons d’une analyse de la morphologie sociale des mondes romani en France, dans la deuxième moitié du xix e  siècle.
Le discours républicain sur les « nomades » (1908-1912) : les cas d’Étienne Flandin et de Marc Réville
Authors: Filhol Emmanuel
Published: October 2018

Dans la genèse des propositions parlementaires, projets de loi, débats et rapports qui président au dispositif de contrôle des « nomades » instauré par la loi de 1912, la question de la famille, du travail et de l’habitat appliquée aux Tsiganes intervient comme un facteur idéologique important pour justifier envers eux l’adoption d’une législation particulièrement discriminatoire et vexatoire. À partir du discours tenu entre 1908 et 1912 sur ces thèmes par deux élus républicains, Étienne Flandin et Marc Réville, l’article entend mettre en lumière ce qu’il en est de la violence symbolique inséparable de la dévalorisation sociale et culturelle exprimées à l’endroit des communautés tsiganes.
Tresser du fromage à Zázrivá (Slovaquie). De la tradition d’élevage ovin à l’artisanat fromager
Authors: Lompech Michel , Ricard Daniel
Published: October 2018

Cet article décrit et analyse la configuration particulière du village de Zázrivá (Slovaquie) où se sont développées plusieurs entreprises spécialisées dans la fromagerie traditionnelle. Il interroge à travers cet exemple la pertinence de la notion de district artisanal, le rapport à la tradition et les ressorts du développement local dans les campagnes post-socialistes.
Praxis inventives et subjectivantes dans les camps d’exilés
Authors: Burksaityte Goda , Pestre Élise
Published: October 2018

Les camps d’exilés institués par l’État constituent des dispositifs foucaldiens par excellence où règne le biopouvoir : le contrôle des « populations » s’exerce dans ces espaces d’exception nés de l’urgence. Les sujets exilés qui transitent dans ces « hors-lieux », et ceux qui les prennent en charge, sont dès lors confrontés à une violence qui circule, parfois massive ou sourde, là où le rapport à l’originaire apparaît (ré)actualisé et les vies psychique et pulsionnelle, déliées. Néanmoins, force est de constater qu’un grand nombre de professionnels de terrain qui œuvrent au quotidien dans ces camps s’inscrivent dans des pratiques subversives et humanisantes, mettant en acte une forme de résistance créatrice à travers des praxis inventives qui favorisent les processus de (re)subjectivation. Cet article rend compte de cette dynamique à la portée sublimatoire, à travers l’analyse de pratiques professionnelles dans le champ du soin psychique et de l’école.