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Abir Igamberdiev

    Abir Igamberdiev

    Organic acids are synthesized in plants as a result of the incomplete oxidation of photosynthetic products and represent the stored pools of fixed carbon accumulated due to different transient times of conversion of carbon compounds in... more
    Organic acids are synthesized in plants as a result of the incomplete oxidation of photosynthetic products and represent the stored pools of fixed carbon accumulated due to different transient times of conversion of carbon compounds in metabolic pathways. When redox level in the cell increases, e.g., in conditions of active photosynthesis, the tricarboxylic acid (TCA) cycle in mitochondria is transformed to a partial cycle supplying citrate for the synthesis of 2-oxoglutarate and glutamate (citrate valve), while malate is accumulated and participates in the redox balance in different cell compartments (via malate valve). This results in malate and citrate frequently being the most accumulated acids in plants. However, the intensity of reactions linked to the conversion of these compounds can cause preferential accumulation of other organic acids, e.g., fumarate or isocitrate, in higher concentrations than malate and citrate. The secondary reactions, associated with the central metab...
    Page 1. AU Igamberdiev Semiosis and Reflectivity in Life and Consciousness 1 Semiosis and Reflectivity in Life and Consciousness Abir U. Igamberdiev Modified version of the paper published in Semiotica (1999) 123 (3-4): 231-246 Abstract ...
    Page 1. Biological evolution — a semiotically constrained growth of complexity «Biological evolution — a semiotically constrained growth of complexity» by Abir U. Igamberdiev Source: Sign Systems Studies (Sign Systems Studies ...