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Hary Yu,Sun Min Park,Min Suk Rhee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
This study aimed to propose themes for future viral research, with increasing considerations and demands on viral food safety. National strategies and research and development (R&D) projects, completed or in progress within 10 years, were investigated in food safety agency websites/reports of five countries (United States, United Kingdom, Germany, Canada, and Australia/New Zealand). The research themes were extracted, listed, and further categorized into 10 major subdivisions ("detection methods", "genetic analysis", "surveillance", etc.) based on the opinions of food safety experts. Research projects regarding "basic characterization", such as survival or resistance analysis, took the highest proportion, followed by projects on "epidemiology" or "disinfection". Moreover, foodborne (norovirus, rotavirus, hepatitis A/E virus) and zoonotic viruses (influenza A virus, avian influenza virus, coronavirus including SARS-CoV-2) focused in predominant numbers of the global research projects were identified. The results of this study support the importance and urgency of future national research projects which could ensure virus issues in aspects of food safety.
Hary Yu,Sun Min Park,Min Suk Rhee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
After the occurrence of the COVID-19 pandemic, there is a growing concern on potential risks of new-emerging pathogens and their link to food safety. This study tried to suggest the virus candidates which could infect humans via foods/food-related environments. A prioritization process was established for the candidates, of which the information was investigated by reviewing websites or reports of international microbiological authorities and academic researches. Prioritization was based on (1) whether the authorities were providing the hazard information, (2) whether it could cause respiratory diseases (respiratory virus) or zoonosis (zoonotic virus), and (3) whether its transmission via foods/environments has been reported. A total of 85 viruses were initially obtained and 48 relevant viruses, including 12 respiratory and 41 zoonotic viruses, were sorted out. Among 48 viruses, pathogens that provoked food (e.g. MERS-CoV, Hepatitis E, Lassa virus, Nipah virus) or animal/environment-mediated infections (e.g. SARS-CoV, Influenza A virus) were nominated as a high priority. This study proposes a blueprint for future microbiological management strategies regarding viral food safety.
Microbiological/Physicochemical Quality and Temperature Distribution of Lunch Boxes
Su Min Kim,Hary Yu,Yohan Yoon,Min Suk Rhee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
As the demand for ready-to-eat food increases, it has been reported that the incidence of foodborne diseases occurs after the consumption of ready-to-eat foods, including lunch boxes (LB). This study consisted of qualitative analysis of three foodborne bacteria (Bacillus cereus, Escherichia coli, and Staphylococcus aureus) on 80 LB samples purchased from convenience stores. The physicochemical factors (salinity, sugar content, and pH) and distribution temperature (surface/core temperature and exposure temperature at display stand) of the LB samples were further analyzed. B. cereus was the most frequently isolated pathogen (28.8%, 23/80), followed by S. aureus (3.8%, 3/80) and E. coli (1.3%, 1/80). Salinity, sugar content, and pH were measured to be 5.6±2.8%, 7.8±3.7 Brix, and 6.0±0.6, respectively. The exposure temperature of the LB samples was 9.4±1.5°C, indicating satisfaction of standard refrigeration conditions. The overall results provide comprehensive information on the microbiological/physicochemical properties and distribution environment of commonly consumed LB in Korea.
Sinha, Soumyadeep,Ramasamy, Hari Vignesh,Nandi, Dip K.,Didwal, Pravin N.,Cho, Jae Yu,Park, Chan-Jin,Lee, Yun-Sung,Kim, Soo-Hyun,Heo, Jaeyeong The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.34
<P>In addition to their optoelectronic applications, Zn-based oxides and sulfides have also been widely studied as electrode materials in Li-ion batteries owing to their high theoretical capacity. However, both the materials suffer from a drastic loss in capacity due to their poor conductivity and electrochemical instability. A very efficient and carefully controlled combination of these two may address these limitations. In this work, thin films of zinc oxysulfide (ZnOS) with an O/(O + S) ratio of ∼0.7 were deposited using a combination of oxide and sulfide atomic layer deposition (ALD) cycles; they were then tested as anodes in Li-ion batteries. The material was grown directly on a stainless steel substrate (SS), characterized extensively using several <I>ex situ</I> characterization tools, and then used as an anode with no binder or conductive additives. Cyclic voltammetry measurements were used to confirm the reversible conversion of ZnOS in addition to the well-known alloying-dealloying Li-Zn reaction. The material loading was further optimized by varying the number of ALD supercycles to attain the maximum stable cycling performance. The highest stable capacities of 632.9 and 510.3 mA h g<SUP>−1</SUP> were achieved at current densities of 0.1 and 1 A g<SUP>−1</SUP> (∼4 and 40 μA cm<SUP>−2</SUP>), respectively, for a ZnOS film with an optimum thickness of ∼75 nm. The optimized ZnOS anode exhibited superior electrochemical performance in comparison to the equivalent pristine ZnO and ZnS anodes. Finally, the post-cycling analysis of the binder-free ALD grown ZnOS anodes demonstrated excellent adhesion to the SS substrate and the high stability of these films upon cycling.</P>