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Thi Mac TH, Phuong Nguyen TD, Dang MN, Quyen Ta TT, Spagnoli P, Uyttendaele M, Jacxsens L. Towards a risk-based food safety management system in the fresh produce supply chain in Da Nang, Viet Nam. Heliyon 2024; 10:e32701. [PMID: 38975236 PMCID: PMC11225736 DOI: 10.1016/j.heliyon.2024.e32701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 05/30/2024] [Accepted: 06/06/2024] [Indexed: 07/09/2024] Open
Abstract
Food safety has emerged as a paramount concern for both Vietnamese consumers and the government. However, limited data are available on food safety management systems in Viet Nam. This study identified significant gaps in good agricultural and hygienic practices along the fresh produce chain (farmers and traditional wholesalers/market sellers) in the region of Da Nang, Viet Nam. This was achieved through a survey on good agricultural and hygienic practices for farmers (n = 100) and sellers (n = 100), which researchers further supplemented by microbiological analysis for E. coli, Salmonella spp., and Listeria monocytogenes on leafy greens, water in contact with produce and contact surfaces (hands). The results indicated that 86.0 % of farmers and 54.0 % of sellers received food safety training in the last 3 years; and women dominated both vegetable cultivation but also trading. Farm-level deficiencies included inadequate handwashing practices, lack of documentation for manure application schedules, improper washing and drying of harvest tools, failure to keep containers elevated off the ground, improper storage of vegetables, and inadequate covering of containers, with respectively 34.0 %, 30.3 %, 12.1 %, 41.7 % and 7.9 % of farmers executing the practice as prescribed by the WHO/FAO '5 keys of growing safer fruits and vegetables'. As for sellers, the most dominant gaps (<50.0 % compliance) were the way of handwashing and the practice of keeping containers elevated off the ground before, during, and after harvesting. The microbiological analysis confirmed that, in a total of 36 fresh produce samples including mustard greens, cucumber, lettuce, and crown daisy, the number of samples positive for E. coli, Salmonella spp., and L. monocytogenes were 12, 2, and 10 respectively. Samples of hands and the irrigation water showed high contamination with E. coli. Based on identified gaps, risk communication tools were developed and distributed amongst farmers, sellers, and Da Nang food safety management authority (governmental organisation performing inspections in the traditional food markets). As intervention, two farmers and two sellers were trained in safe agricultural practices for the cultivation of fresh vegetables (managerial intervention) and instructed to use tap water as irrigation water instead of uncontrolled surface water (technological intervention). A post-assessment was conducted, including redoing the survey on good practices and microbiological analysis. The outcome of these interventions showed positive results in terms of good agricultural and hygienic practices resulting in improved hygiene levels and safety of the fresh produce. The findings from this research have the potential to provide a model for the development of a science-based risk management strategy in alternative food chains or geographic areas in emerging countries.
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Affiliation(s)
- Thanh Ha Thi Mac
- Department of Food Technology, Faculty of Chemical Engineering, University of Science and Technology, The University of Da Nang, Da Nang City, 550000, Viet Nam
| | - Thi Dong Phuong Nguyen
- Department of Food Technology, Faculty of Chemical Engineering, University of Science and Technology, The University of Da Nang, Da Nang City, 550000, Viet Nam
| | - Minh Nhat Dang
- Department of Food Technology, Faculty of Chemical Engineering, University of Science and Technology, The University of Da Nang, Da Nang City, 550000, Viet Nam
| | - Thi To Quyen Ta
- Department of Food Technology, Faculty of Chemical Engineering, University of Science and Technology, The University of Da Nang, Da Nang City, 550000, Viet Nam
| | - Pauline Spagnoli
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Mieke Uyttendaele
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
| | - Liesbeth Jacxsens
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000, Ghent, Belgium
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Li H, Wu Y, Feng D, Jiang Q, Li S, Rong J, Zhong L, Methner U, Baxter L, Ott S, Falush D, Li Z, Deng X, Lu X, Ren Y, Kan B, Zhou Z. Centralized industrialization of pork in Europe and America contributes to the global spread of Salmonella enterica. NATURE FOOD 2024; 5:413-422. [PMID: 38724686 PMCID: PMC11132987 DOI: 10.1038/s43016-024-00968-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 03/26/2024] [Indexed: 05/16/2024]
Abstract
Salmonella enterica causes severe food-borne infections through contamination of the food supply chain. Its evolution has been associated with human activities, especially animal husbandry. Advances in intensive farming and global transportation have substantially reshaped the pig industry, but their impact on the evolution of associated zoonotic pathogens such as S. enterica remains unresolved. Here we investigated the population fluctuation, accumulation of antimicrobial resistance genes and international serovar Choleraesuis transmission of nine pig-enriched S. enterica populations comprising more than 9,000 genomes. Most changes were found to be attributable to the developments of the modern pig industry. All pig-enriched salmonellae experienced host transfers in pigs and/or population expansions over the past century, with pigs and pork having become the main sources of S. enterica transmissions to other hosts. Overall, our analysis revealed strong associations between the transmission of pig-enriched salmonellae and the global pork trade.
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Affiliation(s)
- Heng Li
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China
| | - Yilei Wu
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Department of Biological Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, China
| | - Dan Feng
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China
| | - Quangui Jiang
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China
| | - Shengkai Li
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
| | - Jie Rong
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
| | - Ling Zhong
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China
| | - Ulrich Methner
- Institute of Bacterial Infections and Zoonoses, Friedrich-Loeffler-Institut, Jena, Germany
| | - Laura Baxter
- Warwick Bioinformatics Research Technology Platform, University of Warwick, Coventry, UK
| | - Sascha Ott
- Warwick Medical School, University of Warwick, Coventry, UK
| | - Daniel Falush
- The Center for Microbes, Development and Health, CAS Key Laboratory of Molecular Virology and Immunology, Shanghai Institute of Immunity and Infection, Chinese Academy of Sciences, Shanghai, China
| | - Zhenpeng Li
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Xiangyu Deng
- Center for Food Safety, University of Georgia, Griffin, GA, USA
| | - Xin Lu
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
| | - Yi Ren
- Iotabiome Biotechnology Inc., Suzhou, China.
| | - Biao Kan
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
| | - Zhemin Zhou
- Key Laboratory of Alkene-Carbon Fibres-Based Technology & Application for Detection of Major Infectious Diseases, MOE Key Laboratory of Geriatric Diseases and Immunology, Pasteurien College, Suzhou Medical College, Soochow University, Suzhou, China.
- Suzhou Key Laboratory of Pathogen Bioscience and Anti-infective Medicine, Jiangsu Province Engineering Research Center of Precision Diagnostics and Therapeutics Development, Soochow University, Suzhou, China.
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
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Nikkhah A, Ghnimi S, Tichenor Blackstone N, Nikkhah F, Jacxsens L, Devlieghere F, Van Haute S. Inclusion of microbiological food safety as a novel aspect in life cycle assessments of food production. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2024; 34:2353-2365. [PMID: 37621018 DOI: 10.1080/09603123.2023.2248899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 08/14/2023] [Indexed: 08/26/2023]
Abstract
The life cycle assessment (LCA) methodology currently covers a limited number of human health-related impact categories. Microbiological food safety is an essential aspect for the selection of an appropriate food production system and has been neglected in the LCA so far. A framework for the inclusion of a microbiological food safety indicator, expressed as disability-adjusted life year (DALY) value of the consumed food product to the human health damage category (end-point) was created, and applied in a case study model on the cooked-chilled meals as the ready-to-eat meals can be associated with the occurrence of foodborne illness cases and outbreaks. This study suggests a framework for the inclusion of microbiological risk caused by Bacillus cereus associated with the consumption of ready-to-eat meals (in Belgium) in the LCA. The results indicated that the microbiological risk of one package of the investigated ready-to-eat meal was 1.95 × 10-6 DALY, and the obtained DALY value was included as an impact category in the LCA methodology. Inclusion of other categories of food safety (including chemical safety hazards, pesticide residues, heavy metals, and mycotoxins) in LCA could be done in the same fashion.
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Affiliation(s)
- Amin Nikkhah
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
- Department of Environmental Technology, Food Technology and Molecular Biotechnology, Ghent University Global Campus, Incheon, South Korea
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA, USA
| | - Sami Ghnimi
- Department of Environmental Technology, Food Technology and Molecular Biotechnology, Ghent University Global Campus, Incheon, South Korea
- Laboratory of Automatic Control, Chemical and Pharmaceutical Engineering (LAGEPP), Université Claude Bernard Lyon 1, Villeurbanne, France
- Department of food science, ISARA, Lyon, France
| | | | - Farima Nikkhah
- Department Industrial Engineering, Rahbord Shomal University, Rasht, Iran
| | - Liesbeth Jacxsens
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Frank Devlieghere
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Sam Van Haute
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
- Department of Environmental Technology, Food Technology and Molecular Biotechnology, Ghent University Global Campus, Incheon, South Korea
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Gong J, Sun Y, Du H, Jiang X. Research on safety risk control of prepared foods from the perspective of supply chain. Heliyon 2024; 10:e25012. [PMID: 38317960 PMCID: PMC10839956 DOI: 10.1016/j.heliyon.2024.e25012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 01/14/2024] [Accepted: 01/18/2024] [Indexed: 02/07/2024] Open
Abstract
Prepared foods bring great convenience to people's lives, but they also entail safety risks in all aspects, from production to sales. The cooperation of the supply chain and the supervision of the government are key to promoting the safety management of prepared foods. This paper considers the government's regulation, focuses on the interaction relationship between the producer and the retailer of prepared foods, and builds an evolutionary game model to analyze the influence of collaborative decision-making between prepared food producers and retailers in preventing and controlling food safety risks under the government's regulatory strategy. The research finds that: (1) Under certain conditions, there are three stable equilibrium strategies within the prepared foods supply chain: bilateral low-safety inputs, unilateral high-safety inputs, and bilateral high-safety inputs. (2) Government regulators can influence the safety input behaviors of prepared food supply chain enterprises by adjusting investigation probabilities and punishment severity. (3) The safety input behaviors of these enterprises are influenced by various factors, including costs, revenues, brand image, reputation, and the consequences associated with contractual violations. This paper represents the first systematic analysis of prepared food safety from a supply chain perspective. It fills a gap in the existing literature in this area, offering guidance and suggestions for prepared food supply chain enterprises, as well as references and recommendations for government regulators.
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Affiliation(s)
- Jing Gong
- Institute of Data Science and Agricultural Economics, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Yong Sun
- School of Public Administration & Institute of Rural Revitalization, Guangzhou University, Guangzhou, 510006, China
| | - Hongyan Du
- Institute of Data Science and Agricultural Economics, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Xingling Jiang
- College of National Culture and Cognitive Science, Guizhou Minzu University, Guiyang, 550025, China
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Coleman ME, Oscar TP, Negley TL, Stephenson MM. Suppression of pathogens in properly refrigerated raw milk. PLoS One 2023; 18:e0289249. [PMID: 38085721 PMCID: PMC10715650 DOI: 10.1371/journal.pone.0289249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 07/13/2023] [Indexed: 12/18/2023] Open
Abstract
Conflicting claims exist regarding pathogen growth in raw milk. A small pilot study was designed to provide definitive data on trends for pathogen growth and decline in raw bovine milk hygienically produced for direct human consumption. An independent laboratory conducted the study, monitoring growth and decline of pathogens inoculated into raw milk. Raw milk samples were inoculated with foodborne pathogens (Campylobacter, E. coli O157:H7, Listeria monocytogenes, or Salmonella) at lower (<162 colony forming units (CFU) per mL) and higher levels (<8,300 CFU/mL). Samples were stored at 4.4°C and quantified over time after inoculation (days 0, 3, 6, 9, 12, and 14) by standard culture-based methods. Statistical analysis of trends using the Mann-Kendall Trend Test and Analysis of Variance were conducted for 48 time series observations. Evidence of pathogen growth was documented for L. monocytogenes in 8 of 12 replicates (P = 0.001 to P = 0.028). Analysis of variance confirmed significant increases for L. monocytogenes at both initial levels in week 2. No evidence of growth was documented over 14 days for the three pathogens predominantly associated with raw milk outbreaks in the US (Campylobacter, E. coli O157:H7, and Salmonella). Further research is needed to characterize parameters for pathogen growth and decline to support re-assessment of risks that were based on incorrect assumptions about interactions of pathogens with the raw milk microbiota.
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Affiliation(s)
- M. E. Coleman
- Coleman Scientific Consulting, Groton, NY, United States of America
| | - T. P. Oscar
- USDA, Agricultural Research Service, Princess Ann, MD, United States of America
| | - T. L. Negley
- TIG Environmental, Syracuse, NY, United States of America
| | - M. M. Stephenson
- Advancement and External Affairs, Syracuse University, Syracuse, NY, United States of America
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Mahami T, Odai BT, Nettey SN, Asamoah A, Adjei I, Offei B, Mireku A, Ayeh EA, Ocloo FC. Microbial food safety of lettuce produced under irrigated wastewater from Onyasia River in Ghana. Heliyon 2023; 9:e19273. [PMID: 37662740 PMCID: PMC10474412 DOI: 10.1016/j.heliyon.2023.e19273] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 08/14/2023] [Accepted: 08/17/2023] [Indexed: 09/05/2023] Open
Abstract
Fresh produce continues to be the main source of foodborne illness outbreaks, particularly in developing countries where water stress results in the use of surface wastewater all year round for irrigation of vegetables. The objective of the current study was to evaluate the microbial quality of lettuce irrigated with wastewater from Onyasia river. Lettuce and soil were sampled from selected vegetable farms on the Eastern gate of the Ghana Atomic Energy Commission land alongside surface wastewater from the Onyasia river, which is used as the main source for irrigation. Samples were analyzed for aerobic mesophilic plate counts, total coliforms count, fecal coliforms count, Salmonella counts and intestinal parasites using standard methods. Surface wastewater was found to be contaminated with mean fecal coliform counts of log 3.50 cfu/100 mL. Enterobacter cloacae, Acinetobacter baumannii, and Klebsiella pneumonia were also isolated from the wastewater samples. No intestinal parasite egg was detected in wastewater samples. While fecal coliforms and Salmonella spp were not detected, mean aerobic mesophilic plate counts (log 4.82 cfu/g) and total coliforms count (log 3.50 cfu/g) were recorded in the lettuce samples. Enterobacter asburiae, Acinetobacter baumannii, Klebsiella variicola and Citrobacter freundii were isolated from lettuce. Infective larvae of helminths were observed on lettuce samples at a density of 36/g-648/g with a mean of 342/g. Soil samples recorded a mean aerobic mesophilic plate counts of log 6.14 cfu/g, total coliforms count of log 4.90 cfu/g while fecal coliforms and Salmonella spp were not detected (<1 cfu/g) Soil samples yielded a mean infective larval count of 1941.5 larvae/g and a Strongyle count of 12 eggs/g. Even though less than 1 cfu/g of Salmonella spp were found, the study found lettuce to be contaminated with other foodborne bacteria pathogens, opportunistic bacteria pathogens, eggs and infective larvae of intestinal parasites of health importance. As a consequence, the microbial food safety risk associated with wastewater irrigated vegetables was observed to be high with possible public health implications. It is recommended that wastewater from the Onyasia River should be treated before use for irrigation of lettuce.
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Affiliation(s)
- Tahiru Mahami
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Bernard T. Odai
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Samuel N.A. Nettey
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Anita Asamoah
- National Nuclear Research Institute (NNRI), GAEC, Accra, Ghana
| | - Isaac Adjei
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Benjamin Offei
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Abigail Mireku
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Ernestina A. Ayeh
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
| | - Fidelis C.K. Ocloo
- Biotechnology and Nuclear Agriculture Research Institute (BNARI), GAEC, Accra, Ghana
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Song X, Yang Y, Xiao C, Zhang C, Liu Y, Wang Y. Spatiotemporal Characteristics of Food Supply-Demand Balance in Uzbekistan under Different Scenarios. Foods 2023; 12:foods12102065. [PMID: 37238884 DOI: 10.3390/foods12102065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/06/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
The food supply-demand balance is a perpetual concern for many countries, especially developing countries, such as Uzbekistan. Using the land resource carrying capacity model, here, food supply and demand for the cereals and calories in Uzbekistan during 1995-2020 were revealed. Despite increased demand for cereals and calories, unstable crop production has led to volatile growth patterns. The carrying capacity of cropland resources under Uzbekistan's consumption standard shifted from overload to surplus and then to balance. Moreover, the carrying capacity of cropland resources under the healthy diet standard moved from balance to surplus in the past 25-years. Additionally, the calorific equivalent land resource carrying capacity under Uzbekistan's consumption standard fluctuated, with the carrying state shifting from balance to surplus, and the healthy diet standard still in overload. These findings can help guide sustainable production and consumption strategies in Uzbekistan and other countries by analyzing the consumption structure and changes in supply and demand relationships.
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Affiliation(s)
- Xinzhe Song
- Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Yanzhao Yang
- Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
- Key Laboratory of Carrying Capacity Assessment for Resource and Environment, Ministry of Natural Resources, Beijing 101149, China
| | - Chiwei Xiao
- Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chao Zhang
- Faculty of Geography, Yunnan Normal University, Kunming 650500, China
| | - Ying Liu
- Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
| | - Yuanqing Wang
- Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
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Progress of Molecular Display Technology Using Saccharomyces cerevisiae to Achieve Sustainable Development Goals. Microorganisms 2023; 11:microorganisms11010125. [PMID: 36677416 PMCID: PMC9864768 DOI: 10.3390/microorganisms11010125] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/26/2022] [Accepted: 12/31/2022] [Indexed: 01/06/2023] Open
Abstract
In the long history of microorganism use, yeasts have been developed as hosts for producing biologically active compounds or for conventional fermentation. Since the introduction of genetic engineering, recombinant proteins have been designed and produced using yeast or bacterial cells. Yeasts have the unique property of expressing genes derived from both prokaryotes and eukaryotes. Saccharomyces cerevisiae is one of the well-studied yeasts in genetic engineering. Recently, molecular display technology, which involves a protein-producing system on the yeast cell surface, has been established. Using this technology, designed proteins can be displayed on the cell surface, and novel abilities are endowed to the host yeast strain. This review summarizes various molecular yeast display technologies and their principles and applications. Moreover, S. cerevisiae laboratory strains generated using molecular display technology for sustainable development are described. Each application of a molecular displayed yeast cell is also associated with the corresponding Sustainable Development Goals of the United Nations.
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Abnavi MD, Kothapalli CR, Munther D, Srinivasan P. Chlorine inactivation of Escherichia coli O157:H7 in fresh produce wash process: Effectiveness and modeling. Int J Food Microbiol 2021; 356:109364. [PMID: 34418698 DOI: 10.1016/j.ijfoodmicro.2021.109364] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 07/26/2021] [Accepted: 08/10/2021] [Indexed: 10/20/2022]
Abstract
Inactivation rate constant or inactivation coefficient (specific lethality) quantifies the rate at which a chemical sanitizer inactivates a microorganism. This study presents a modified disinfection kinetics model to evaluate the potential effect of organic content on the chlorine inactivation coefficient of Escherichia coli O157:H7 in fresh produce wash processes. Results show a significant decrease in the bactericidal efficacy of free chlorine (FC) in the presence of organic load compared to its absence. While the chlorine inactivation coefficient of Escherichia coli O157:H7 is 70.39 ± 3.19 L/mg/min in the absence of organic content, it drops by 73% for a chemical oxygen demand (COD) level of 600-800 mg/L. Results also indicate that the initial chlorine concentration and bacterial load have no effect on the chlorine inactivation coefficient. A second-order chemical reaction model for FC decay, which utilizes a proportion of COD as an indicator of organic content in fresh produce wash was employed, yielding an apparent reaction rate of (9.45 ± 0.22) × 10-4 /μM/min. This model was validated by predicting FC concentration in multi-run continuous wash cycles with periodic replenishment of chlorine.
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Affiliation(s)
- Mohammadreza Dehghan Abnavi
- Department of Chemical and Biomedical Engineering, 2121 Euclid Avenue, Cleveland State University, Cleveland, OH 44115, USA
| | - Chandrasekhar R Kothapalli
- Department of Chemical and Biomedical Engineering, 2121 Euclid Avenue, Cleveland State University, Cleveland, OH 44115, USA
| | - Daniel Munther
- Department of Mathematics, 2121 Euclid Avenue, Cleveland State University, Cleveland, OH 44115, USA
| | - Parthasarathy Srinivasan
- Department of Mathematics, 2121 Euclid Avenue, Cleveland State University, Cleveland, OH 44115, USA.
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