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Virulence factors in Escherichia coli isolated from calves with diarrhea in Vietnam
Tan Duc Nguyen,Thin Thanh Vo,Hung Vu-Khac 대한수의학회 2011 Journal of Veterinary Science Vol.12 No.2
This study was conducted to determine the prevalence and characteristics of pathogenic Escherichia (E.) coli strains from diarrheic calves in Vietnam. A total of 345 E. coli isolates obtained from 322 diarrheic calves were subjected to PCR and multiplex PCR for detection of the f5, f41, f17, eae, sta, lt, stx1, and stx2 genes. Of the 345 isolates, 108 (31.3%) carried at least one fimbrial gene. Of these 108 isolates, 50 carried genes for Shiga toxin and one possessed genes for both enterotoxin and Shiga toxin. The eae gene was found in 34 isolates (9.8%), 23 of which also carried stx genes. The Shiga toxin genes were detected in 177 isolates (51.3%) and the number of strains that carried stx1, stx2 and stx1/stx2 were 46, 73 and 58, respectively. Among 177 Shiga toxin-producing E. coli isolates, 89 carried the ehxA gene and 87 possessed the saa gene. Further characterization of the stx subtypes showed that among 104 stx1-positive isolates, 58 were the stx1c variant and 46 were the stx1 variant. Of the 131 stx2-positive strains, 48 were stx2, 48 were stx2c, 11 were stx2d, 17 were stx2g, and seven were stx2c/stx2g subtypes. The serogroups most prevalent among the 345 isolates were O15, O20, O103 and O157.
Multi-step synthesis of 5-Acetoxylmethyl-2-furfural (AMF) from D-Fructose
박석규,문다솜,( Vo Thi Hoang Anh ),( Tan Phat Nguyen ),조진구,( Huynh Thanh Thien Nhan ),김보라 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
5-Hydroxymethyl-2-furfural (HMF) and its derivatives are among the promising biomass-derived platform chemicals, which have the potential to become carbon-neutral feedstock or building blocks in a green, renewable and sustainable industry. However, the current methods for HMF production from D-Fructose have several drawbacks such as the use high boiling solvents and difficulties in product purification. Comparing to HMF, 5-acetoxylmethyl-2-fufural (AMF) is considered to be more thermal stable and rather easier to isolate. In this research, rather than transforming D-Fructose into HMF in aprotic polar solvents such as DMSO, we are trying to synthesize AMF by direct dehydration of 1,6-Diacetyl-fructofuranose (DAF), a di-ester derivation of D-Fructose. This approach has the advantage of avoiding the difficulties related to HMF purification since AMF can be isolated from the reaction mixture by recrystallization or vacuum distillation.
Han Thi Vo,Tien Duc Dao,Tuyen Van Duong,Tan Thanh Nguyen,Binh Nhu Do,Tinh Xuan Do,Khue Minh Pham,Vinh Hai Vu,Linh Van Pham,Lien Thi Hong Nguyen,Lan Thi Huong Le,Hoang Cong Nguyen,Nga Hoang Dang,Trung 질병관리청 2024 Osong Public Health and Research Persptectives Vol.15 No.1
Objectives: The incidence of posttraumatic stress disorder (PTSD) has increased, particularly among individuals who have recovered from coronavirus disease 2019 (COVID-19) infection. Health literacy is considered a “social vaccine” that helps people respond effectively to the pandemic. We aimed to investigate the association between long COVID-19 and PTSD, and to examine the modifying role of health literacy in this association.Methods: A cross-sectional study was conducted at 18 hospitals and health centers in Vietnam from December 2021 to October 2022. We recruited 4,463 individuals who had recovered from COVID-19 infection for at least 4 weeks. Participants provided information about their sociodemographics, clinical parameters, health-related behaviors, health literacy (using the 12-item short-form health literacy scale), long COVID-19 symptoms and PTSD (Impact Event Scale-Revised score of 33 or higher). Logistic regression models were used to examine associations and interactions.Results: Out of the study sample, 55.9% had long COVID-19 symptoms, and 49.6% had PTSD. Individuals with long COVID-19 symptoms had a higher likelihood of PTSD (odds ratio [OR], 1.68; 95% confidence interval [CI], 1.63–2.12; p<0.001). Higher health literacy was associated with a lower likelihood of PTSD (OR, 0.98; 95% CI, 0.97–0.99; p=0.001). Compared to those with long COVID-19 symptoms and the lowest health literacy score, those with long COVID-19 symptoms and a 1-point health literacy increment had a 3% lower likelihood of PTSD (OR, 0.97; 95% CI, 0.96–0.99; p=0.001).Conclusion: Health literacy was found to be a protective factor against PTSD and modified the negative impact of long COVID-19 symptoms on PTSD.
친환경 연소에 따른 가스 터빈 내 유동 및 성능 특성의 수치해석적 연구
김병욱(Byungwook Kim),마이탄담(Thanh Dam Mai),보두이딴(Duy Tan Vo),장성호(Sungho Chang),유재영(Jaiyoung Ryu) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The need to reduce greenhouse gas emissions from gas turbines has raised in response to the international demand for greenhouse gas reduction. Eco-friendly combustion, which can be represented by hydrogen combustion and oxy-fuel combustion, have potential of enormous reduction of greenhouse gases. However, previous researches hardly considered about the effect of such combustion in the turbine part. In this study, hydrogen combustion and oxy-fuel combustion simulation were performed to analyze the characteristics of flow in combustor. Quantitative investigation of the gas turbine flow characteristics and performance by each combustion condition were performed by following gas turbine simulation. The gas turbine used for computational analysis is GE-E3 1.5 stage model, and conditions of the flow were based on combustion simulation results. The analysis shows that the output of hydrogen increased due to the fast flow velocity, but the total-to-total efficiency diminished compared to natural gas.
Unipolar Resistance Switching Characteristics in a Thick ZnO/Cu/ZnO Multilayer Structure
Tran Le,Hoang Cao Son Tran,Van Hieu Le,Tuan Tran,Cao Vinh Tran,Thanh Tan Vo,Mau Chien Dang,김상섭,이재찬,Bach Thang Phan 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.7
The resistance switching mechanism and the electrical conduction of thick Cu/ZnO/Cu/ZnO/Cu structures were investigated for various ZnO thicknesses (40, 80, 160, and 320 nm) when the thickness of the middle Cu layer was 2 nm. The ZnO films had a microstructure with columnar grains normal to the substrate. The switching voltages (VSET and VRESET) varied with the thickness of the ZnO layer. A symmetric electrode structure exhibited a unipolar resistance switching. The electrical transport of both high-resistance state (HRS) and low-resistance state (LRS) was Ohmic conduction, and the resistance switching mechanism was driven by the formation and the rupture of Cu conducting paths.