Effects of Nutrient Factors on Morphology and Surface Characteristics of Yeast Cells in Aquatic Environment

摘要

The morphology and surface characteristics of yeast cells have important impacts on a yeast-wastewater treatment system. In this study, the effects of supplement of Ca2+, Mn2+, Mg2+, NH4+ on settleability, flocculation ability, hydrophobicity and morphology of cells of Candida tropicalis (O2) and Candida lipolytica (G,) were investigated. Result shows that: the effects of different nutrient factors on cell properties vary with yeast srains; The deficiency of Mg2+ can induce G1 to transform to the hyphal morphology which probably deteriorates the cell's settleability; There is no manifest influence of Ca2+ and Mn2+ on settleability and hydrophobicity of yeast cells. Whereas, to a certain extent, Ca2+ and Mn2+ inhibit the flocculation ability of O2 and G1. Addition of NH4+ can apparently enhance the growth, as well as germination, and hydrophobicity of yeast cells.