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    Structural changes in local Thai beef during sous-vide cooking
    (2021-05-01)
    Supaphon, Pattama
    ;
    Kerdpiboon, Soraya
    ;
    Vénien, Annie
    ;
    Loison, Olivier
    ;
    Sicard, Jason
    Thai beef (Bos indicus) samples were sous-vide-cooked at temperatures of 60°C, 70°C or 80°C for 2 to 36 hrs and prepared for microstructure characterization by light and electron microscopy. Muscle fibers showed a first phase of lateral shrinkage during the first 6 hrs of cooking at 60–70°C and the first 2 hrs at 80°C followed by a second phase of significant alternations of shrinkage and swelling independently of water transfers. Swelling peaked at 12 hrs. Microstructural changes were more variable for samples cooked at 60–70°C than for samples cooked at 80°C that showed a larger cross-sectional myofibrillar mass area (CSA). Hypercontracted fibers were evidenced at all temperature–time combinations and were associated with adjacent wavy fibers and a characteristic structural evolution in the mitochondria. The role of thermal denaturation of proteins and the ultrastructural analogy of hypercontracted fibers with cold-shortened fibers are discussed.
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    First-Principles Investigation on Structural and Electronic Properties of Ferromagnetic Fe2P4O12
    (2015-06-23)
    Rerksompus, Pathompong
    ;
    Sarasamak, Kanoknan
    ;
    Boonchom, Banjong
    ;
    Thanomngam, Pitiporn
    Structural and electronic properties of Fe<inf>2</inf>P<inf>4</inf>O<inf>12</inf> have been investigated using first-principles calculation technique. The results indicated that the Fe<inf>2</inf>P<inf>4</inf>O<inf>12</inf> structure is monoclinic of C<inf>2</inf>/c with lattice parameters of a = 12.228 Å, b = 8.530 Å, c = 9.835 Å and β = 118.67°. Two nonequivalent octahedral FeO<inf>6</inf> from the calculation have an average Fe-O distance of 2.143 Å. Both FeO<inf>6</inf> are dominated by covalent interactions assigned to Fe<inf>3d</inf> and O<inf>2p</inf> at the valent electronic states. The DOS calculation gives well explanation on its half-metallic ferromagnetic property. These results are in very good agreement with the previous experimental reports. © 2015
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