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Copper Tolerance of Novel Rhodotorula sp. Yeast Isolated from Gold Mining Ore in Gia Lai, Vietnam
Kim Cuc Thi Nguyen,Phuc Hung Truong,Cuong Tu Ho,Cong Tuan Le,Khoa Dang Tran,Tien Long Nguyen,Manh Tuan Nguyen,Phu Van Nguyen 한국균학회 2023 Mycobiology Vol.51 No.6
In this study, twenty-five yeast strains were isolated from soil samples collected in the goldmining ore in Gia Lai, Vietnam. Among them, one isolate named GL1T could highly tolerateCu2þ up to 10 mM, and the isolates could also grow in a wide range of pH (3–7), and temperature(10–40 �C). Dried biomass of GL1 was able to remove Cu2þ effectively up to 90.49%with a maximal biosorption capacity of 18.1 mg/g at pH 6, temperature 30 �C, and incubationtime 60 min. Sequence analysis of rDNA indicated this strain was closely related toRhodotorula mucilaginosa but with 1.53 and 3.46% nucleotide differences in the D1/D2domain of the 28S rRNA gene and the ITS1-5.8S rRNA gene-ITS2 region sequence, respectively. Based on phylogenetic tree analysis and the biochemical characteristics, the strainappears to be a novel Rhodotorula species, and the name Rhodotorula aurum sp. nov. is proposed. This study provides us with more information about heavy metal-tolerant yeasts andit may produce a new tool for environmental control and metal recovery operations.
Hoang Van Hung,Chu Thi Hong Huyen,Nguyen Thi Dong,Nguyen Thi Hong Vien,Nguyen Thu Huyen,Luu Thi Cuc,Van Huu Tap,Nguyen Hoang,Duong Dinh Tuan,Nguyen Van Huu Luong 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.5
In this study, heterogeneous catalytic ozonation using fl y ash (FA) modifi ed ZnO nanoparticles to the decolorization of acid orange II (AOII) was studied. The combination of ZnO and fl y ash via an incipient wetness impregnation method to form ZOFA composites created a synergistic eff ect that led to effi cient catalytic ozonation activity towards AOII degradation and decolorization compared with individual ozonation processes. From the experimental results, ZOFA composite with the optimal weight ratio between ZnO NPs and FA was 20 wt% (denoted as ZOFA-20) that exhibited outstanding catalytic ozonation activity. Moreover, through other investigations including initial pH conditions and catalyst dosage, AOII could be eff ectively and optimally eliminated by 0.5 g of ZOFA-20 with an initial pH value of 11. The corresponding k value was measured as 0.248 min −1 with a maximum TOC removal content of 77.27%. Besides, ZOFA-20 could show high catalytic ozonation activity even at highly concentrated AOII concentrations while it could also retain its excellent stability and reusability over 5 continuous AOII removal cycles. From the experimental and electron paramagnetic resonance (EPR) results, hydroxyl radical ( · OH) was the main active species during the catalytic ozonation of AOII. The present study provides a promising approach to prepare novel composite-based fl y ash that would be applicable for removing azo dye and other dye pollutants in water via a catalytic ozonation strategy.
Nguyen Kim Cuc Thi,Phuc Hung Truong,Hoa Truong Thi,Xuan Tuy Ho,Phu Van Nguyen 질병관리청 2024 Osong Public Health and Research Persptectives Vol.15 No.1
Objectives: Vibrio parahaemolyticus is a major foodborne pathogen in aquatic animals and a threat to human health worldwide. This study investigated the prevalence, antimicrobial resistance, antimicrobial resistance genes (ARGs), and biofilm formation of V. parahaemolyticus strains isolated from fish mariculture environments in Cat Ba Island, Vietnam.Methods: In total, 150 rearing water samples were collected from 10 fish mariculture farms in winter and summer. A polymerase chain reaction assay was used to identify V. parahaemolyticus, its virulence factors, and ARGs. The antimicrobial resistance patterns and biofilm formation ability of V. parahaemolyticus strains were investigated using the disk diffusion test and a microtiter plate-based crystal violet method, respectively.Results: Thirty-seven V. parahaemolyticus isolates were recovered from 150 samples. The frequencies of the tdh and trh genes among V. parahaemolyticus isolates were 8.1% and 21.6%, respectively. More than 90% of isolates were susceptible to ceftazidime, cefotaxime, and chloramphenicol, but over 72% were resistant to ampicillin, tetracycline, and erythromycin. Furthermore, 67.57% of isolates exhibited multidrug resistance. The presence of ARGs related to gentamicin (aac(3)-IV), tetracycline (tetA) and ciprofloxacin (qnrA) in V. parahaemolyticus isolates was identified. Conversely, no ARGs related to ampicillin or erythromycin resistance were detected. Biofilm formation capacity was detected in significantly more multidrug-resistant isolates (64.9%) than non-multidrug-resistant isolates (18.9%).Conclusion: Mariculture environments are a potential source of antibiotic-resistant V. parahaemolyticus and a hotspot for virulence genes and ARGs diffusing to aquatic environments. Thus, the prevention of antibiotic-resistant foodborne vibriosis in aquatic animals and humans requires continuous monitoring.
Medium-Sized Enterprises: An Empirical Study in Vietnam
Thi Thu Cuc NGUYEN,My Hanh HO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.7
Nowadays, small- and medium-sized enterprises (SMEs) are placed among the key components of the economy in both developed and developing countries. They are internationally known as the driving force based on their enormous contributions to Gross Domestic Product (GDP) and generating new employment. They are generally presumed as the leader of environmental sustainability, economic prosperity, and innovation, particularly for the economy of developing countries such as Vietnam. However, SMEs have difficulty in raising capital, as well as access to credit. One of the reasons is that there are inadequacies in accounting information quality in SMEs as well as the provision of accounting information and accounting information confidentiality. The main objective of this study was to identify, evaluate, and measure the attributes of accounting information quality of SMEs in Hanoi. The study was based on a field survey using a semi-structured questionnaire on a sample of 150 accountants. The study has identified and measured six (6) attributes of accounting information quality of SMEs that have great effects on accountants. There is, statistically, no significant difference in the level of accounting information quality of SMEs in Hanoi from these different business areas. There is no, statistically, significant difference in the level of accounting information quality of SMEs in Hanoi between the mentioned three groups of the job description. Based on the findings, some recommendations are given for SMEs to improve accounting information quality.
NGUYEN Dang Thu Cuc,TRAN Thi Huong Trang 서울대학교 아시아태평양법연구소 2018 Journal of Korean Law Vol.18 No.1
Being a member of the Convention on Biological Diversity (CBD)since 1994, being 31st member of the Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits Arising from their Utilization (NP) since 2014, Vietnam is making its efforts to improve ABS legislation and policy to implement the NP. A master scheme on capacity building on ABS adopted by Prime Minister Nguyen Xuan Phuc was issued in 2016 to implement ABS was promulgated. Decree No. 59/2017/ND-CP, dated May 12, 2017, on the management of access to Genetic Resources (GRs) and the sharing of benefits arising from their utilization (Decree 59) made an important remark in development of ABS law and policy in Vietnam. This Decree covers all basic issues of ABS, detailing the Law on Biodiversity, which was promulgated in 2008 and internalizing the NP in ABS national law. These include essential elements: determining scope definitions, main actors: providers, users, national focal points (NFP), national competent agencies (NCA), benefit sharing, compliance. In spite of important achievements in ABS law development and implementation to date, there remain some weaknesses and shortcomings within the legal system, institutions to facilitate ABS law being implemented well in practice. There are not only the gaps between laws, unclear demarcation of inter-ministerial assigned issues, but also limitation in terms of capacity and awareness of involved actors on ABS issues. This article aims to analyze all these above mentioned points, recommends improving ABS law and policy as well as provides suggestion to overcome limitation.
베트남 소비자의 모바일 결제 이용의도에 관한 연구: 혁신성과 불확실성 회피성향의 영향 분석
응웬티꾹 ( Nguyen Thi Cuc ),표민찬 ( Pyo Minchan ) 한국외국어대학교 동남아연구소 2021 東南亞硏究 Vol.31 No.2
This study examined the effect of consumer innovativeness and perceived risk on the intention to use mobile payment. In addition, this study also investigated the moderating effect of uncertainty avoidance on consumer’s intention of mobile payment. The empirical results are as follows: First, the consumer innovativeness has a positive effect on the intention to use mobile payment, while a negative effect on perceived risk related to mobile payment. In addition, perceived risk negatively affects the intention to use mobile payment. It was confirmed that consumer innovativeness not only directly affects the intention to use mobile payments, but also indirectly affects the intention to use via the mediation of perceived risk. Second, the uncertainty avoidance shows the moderating effect between consumers’ innovativeness and the intention to use mobile payment service, and between perceived risk and the intention to use. In the case of consumers with low uncertainty avoid, it was found that consumer innovativeness has a higher influence on the intention to use mobile payments. Additionally, consumers with a low tendency to avoid uncertainty are not sensitive to the risks associated with mobile payments, so the perceived risk has a lower influence on the intention to use mobile payment.