Low-Cost Device to Measure Concentration of Saccharomyces cerevisiae Through Methylene Blue Reduction. - Rodrigo Beserra de Freitas; Vinicius Nunes Henrique Silva; Vinicius Tremmel Maia; Ozéias Batista dos Santos; Yanina Madalena de Arruda Calvette; Sorele Batista Fiaux (IEEE Trans. Instrum. Meas., 2020)