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Do Nascimento Nunes M.C.,Microbiology and Molecular Biology | Nicometo M.,Iron Mountain | Emond J.P.,Georgia Institute of Technology | Melis R.B.,University of South Florida | Uysal I.,University of South Florida
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences | Year: 2014

Shelf life of fresh fruits and vegetables is greatly influenced by environmental conditions. Increasing temperature usually results in accelerated loss of quality and shelf-life reduction, which is not physically visible until too late in the supply chain to adjust logistics to match shelf life. A blackberry study showed that temperatures inside pallets varied significantly and 57% of the berries arriving at the packinghouse did not have enough remaining shelf life for the longest supply routes. Yet, the advanced shelf-life losswas not physically visible. Some of those pallets would be sent on longer supply routes than necessary, creating avoidable waste. Other studies showed that variable pre-cooling at the centre of pallets resulted in physically invisible uneven shelf life. We have shown that using simple temperature measurements much waste can be avoided using 'first expiring first out'. Results from our studies showed that shelf-life prediction should not be based on a single quality factor as, depending on the temperature history, the quality attribute that limits shelf life may vary. Finally,methods to use air temperature to predict product temperature for highest shelf-life prediction accuracy in the absence of individual sensors for each monitored product have been developed. Our results show a significant reduction of up to 98% in the rootmean- square-error difference between the product temperature and air temperature when advanced estimation methods are used. © 2014 The Author(s) Published by the Royal Society. Source

Padhee S.,University of South Florida | Hu Y.,University of South Florida | Niu Y.,University of South Florida | Bai G.,University of South Florida | And 7 more authors.
Chemical Communications | Year: 2011

We report a new class of peptide mimetics, α-AApeptides, that display broad-spectrum activity against both Gram-negative and Gram-positive bacteria and fungi. With non-hemolytic activity, resistance to protease hydrolysis, and easy sequence programmability, α-AApeptides may emerge as a novel class of antibiotics. © The Royal Society of Chemistry 2011. Source

Niu Y.,University of South Florida | Padhee S.,University of South Florida | Wu H.,University of South Florida | Bai G.,University of South Florida | And 5 more authors.
Chemical Communications | Year: 2011

We report the identification of a new class of antimicrobial peptidomimetics-γ-AApeptides with potent and broad-spectrum activity, including clinically-relevant strains that are unresponsive to most antibiotics. They are also not prone to select for drug-resistance. © The Royal Society of Chemistry 2011. Source

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