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Tri Nguyen-Quang
Biofluids and Biosystems Modeling Lab. (BBML), Department of Engineering, Faculty of Agriculture, Dalhousie University, 39 Cox Road, Truro, NS B2N 5E3, Canada

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Review
Published: 08 July 2021 in AgriEngineering
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The fresh fruit agricultural and distribution sector is faced with risks and uncertainties from climate change, water scarcity, land-use increase for industrial and urban development, consumer behavior, and price volatility. The planning framework for production and distribution is highly complex as a result. Mathematical models have been developed over the decades to deal with this complexity. With improvements in both processor speed and memory, these models are becoming increasingly sophisticated. This review focuses on the recent progress in mathematically based decision making to account for uncertainties in the fresh fruit supply chain. The models in the literature are mostly based on linear and mixed integer programming and involve variants such as stochastic programming and robust optimization. The functional areas of application include planting, harvest optimization, logistics and distribution. The perishability of the fresh fruit supply chain is an important issue as is the cycle time of cultivation and harvest.

ACS Style

Tri-Dung Nguyen; Tri Nguyen-Quang; Uday Venkatadri; Claver Diallo; Michelle Adams. Mathematical Programming Models for Fresh Fruit Supply Chain Optimization: A Review of the Literature and Emerging Trends. AgriEngineering 2021, 3, 519 -541.

AMA Style

Tri-Dung Nguyen, Tri Nguyen-Quang, Uday Venkatadri, Claver Diallo, Michelle Adams. Mathematical Programming Models for Fresh Fruit Supply Chain Optimization: A Review of the Literature and Emerging Trends. AgriEngineering. 2021; 3 (3):519-541.

Chicago/Turabian Style

Tri-Dung Nguyen; Tri Nguyen-Quang; Uday Venkatadri; Claver Diallo; Michelle Adams. 2021. "Mathematical Programming Models for Fresh Fruit Supply Chain Optimization: A Review of the Literature and Emerging Trends." AgriEngineering 3, no. 3: 519-541.

Journal article
Published: 20 December 2019 in AgriEngineering
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We present an optimization model for dragon fruit plantations in Vietnam. The timing of cultivating and harvesting decisions are taken into account as the dragon fruit plant has an approximately ten-year life cycle with maximum average yield in the fourth year. Another consideration also included is the prevalence of forward-buying contracts with locked-in prices. The dragon fruit supply chain faces several difficulties as yield, price, and demand are highly sensitive to weather conditions and global uncertainty factors. The risk factors in the dragon fruit supply chain also depend on species—for example, the red varieties, while more profitable than the white varieties, also have higher export risk because they are subject to global prices and adverse geopolitical conditions.

ACS Style

Tri-Dung Nguyen; Uday Venkatadri; Tri Nguyen-Quang; Claver Diallo; Michelle Adams. Optimization Model for Fresh Fruit Supply Chains: Case-Study of Dragon Fruit in Vietnam. AgriEngineering 2019, 2, 1 -26.

AMA Style

Tri-Dung Nguyen, Uday Venkatadri, Tri Nguyen-Quang, Claver Diallo, Michelle Adams. Optimization Model for Fresh Fruit Supply Chains: Case-Study of Dragon Fruit in Vietnam. AgriEngineering. 2019; 2 (1):1-26.

Chicago/Turabian Style

Tri-Dung Nguyen; Uday Venkatadri; Tri Nguyen-Quang; Claver Diallo; Michelle Adams. 2019. "Optimization Model for Fresh Fruit Supply Chains: Case-Study of Dragon Fruit in Vietnam." AgriEngineering 2, no. 1: 1-26.

Review
Published: 07 December 2019 in Toxins
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Hepatotoxic microcystins (MCs) are the most widespread class of cyanotoxins and the one that has most often been implicated in cyanobacterial toxicosis. One of the main challenges in studying and monitoring MCs is the great structural diversity within the class. The full chemical structure of the first MC was elucidated in the early 1980s and since then, the number of reported structural analogues has grown steadily and continues to do so, thanks largely to advances in analytical methodology. The structures of some of these analogues have been definitively elucidated after chemical isolation using a combination of techniques including nuclear magnetic resonance, amino acid analysis, and tandem mass spectrometry (MS/MS). Others have only been tentatively identified using liquid chromatography-MS/MS without chemical isolation. An understanding of the structural diversity of MCs, the genetic and environmental controls for this diversity and the impact of structure on toxicity are all essential to the ongoing study of MCs across several scientific disciplines. However, because of the diversity of MCs and the range of approaches that have been taken for characterizing them, comprehensive information on the state of knowledge in each of these areas can be challenging to gather. We have conducted an in-depth review of the literature surrounding the identification and toxicity of known MCs and present here a concise review of these topics. At present, at least 279 MCs have been reported and are tabulated here. Among these, about 20% (55 of 279) appear to be the result of chemical or biochemical transformations of MCs that can occur in the environment or during sample handling and extraction of cyanobacteria, including oxidation products, methyl esters, or post-biosynthetic metabolites. The toxicity of many MCs has also been studied using a range of different approaches and a great deal of variability can be observed between reported toxicities, even for the same congener. This review will help clarify the current state of knowledge on the structural diversity of MCs as a class and the impacts of structure on toxicity, as well as to identify gaps in knowledge that should be addressed in future research.

ACS Style

Noureddine Bouaïcha; Christopher Miles; Daniel Beach; Zineb Labidi; Amina Djabri; Naila Benayache; Tri Nguyen-Quang. Structural Diversity, Characterization and Toxicology of Microcystins. Toxins 2019, 11, 714 .

AMA Style

Noureddine Bouaïcha, Christopher Miles, Daniel Beach, Zineb Labidi, Amina Djabri, Naila Benayache, Tri Nguyen-Quang. Structural Diversity, Characterization and Toxicology of Microcystins. Toxins. 2019; 11 (12):714.

Chicago/Turabian Style

Noureddine Bouaïcha; Christopher Miles; Daniel Beach; Zineb Labidi; Amina Djabri; Naila Benayache; Tri Nguyen-Quang. 2019. "Structural Diversity, Characterization and Toxicology of Microcystins." Toxins 11, no. 12: 714.

Preprint
Published: 03 October 2019
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Hepatotoxic microcystins (MCs) are the most widespread class of cyanotoxins and the one that has most often been implicated in cyanobacterial toxicosis. One of the main challenges in studying and monitoring MCs is the great structural diversity within the class. The full chemical structure of the first MC was elucidated in the early 1980s and since then the number of reported structural analogues has grown steadily and continues to do so, thanks largely to advances in analytical methodology. The structures of some of these analogues have been definitively elucidated after chemical isolation using a combination of techniques including nuclear magnetic resonance, amino acid analysis and tandem mass spectrometry (MS/MS). Others have only been tentatively identified using liquid chromatography-MS/MS without chemical isolation. An understanding of the structural diversity of MCs, the genetic and environmental controls for this diversity and the impact of structure on toxicity are all essential to the ongoing study of MCs across several scientific disciplines. However, because of the diversity of MCs and the range of approaches that have been taken for characterizing them, comprehensive information on the state of knowledge in each of these areas can be challenging to gather. We have conducted an in-depth review of the literature surrounding the identification and toxicity of known MCs and present here a concise review of these topics. At present, at least 269 MCs have been reported. Among these, about 20% (54 of 269) appear to be the result of chemical or biochemical transformations of MCs that can occur in the environment or during sample handling and extraction of cyanobacterial, including oxidation products, methyl esters, or post-biosynthetic metabolites. The toxicity of many MCs has also been studied using a range of different approaches and a great deal of variability can be observed between reported toxicities, even for the same congener. This review will help clarify the current state of knowledge on the structural diversity of MCs as a class and the impacts of structure on toxicity, as well as to identify gaps in knowledge that should be addressed in future research.

ACS Style

Noureddine Bouaïcha; Christopher O. Miles; Daniel G. Beach; Zineb Labidi; Amina Djabri; Naila Yasmine Benayache; Tri Nguyen-Quang. Structural Diversity, Characterization and Toxicology of Microcystins. 2019, 1 .

AMA Style

Noureddine Bouaïcha, Christopher O. Miles, Daniel G. Beach, Zineb Labidi, Amina Djabri, Naila Yasmine Benayache, Tri Nguyen-Quang. Structural Diversity, Characterization and Toxicology of Microcystins. . 2019; ():1.

Chicago/Turabian Style

Noureddine Bouaïcha; Christopher O. Miles; Daniel G. Beach; Zineb Labidi; Amina Djabri; Naila Yasmine Benayache; Tri Nguyen-Quang. 2019. "Structural Diversity, Characterization and Toxicology of Microcystins." , no. : 1.