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Biotechnological solubilization of insoluble inorganic phosphate-bearing materials is now accepted as one of the most viable alternative to the traditional chemical methods. Many microorganisms are capable of solubilizing phosphates although this feature is mainly attributed to metabolites such organic acids. During the recent years, we have developed various biotechnological schemes of P-solubilization based on citric acid (Aspergillus niger, Yarrowia lipolytica), gluconic acid (Penicillium variabile), and oxalic...