Influence of pH on the molecular weight of Poly-3-hydroxybutyric Acid (P3HB) produced by recombinant Escherichia coli - Bocanegra, Johanna Katherine; Pradella, José Geraldo da Cruz; Silva, Luiziana Ferreira da; Taciro, Marilda Keico; Gomez, José Gregório Cabrera (Applied Biochemistry and Biotechnology, 2013)