Abstract
AbstractFrom a culture of P. acidi‐propionici (formerly P. arabinosum) in a medium containing lactate and nitrate, a strain with high activity of nitrate reduction was isolated and used in this study. The growth rates on lactate and glucose were not significantly affected by nitrate under anaerobic and aerobic conditions. Addition of nitrate resulted in a decrease of propionate and an increase of acetate and pyruvate produced from lactate and glucose with accumulation of nitrite. In the reaction of cell suspensions in the absence of added nitrogeneous nutrient, a similar result was obtained. Accumulation of large amounts of polysaccharide observed in the presence of glucose under these conditions was not affected by the addition of nitrate. The molar growth yield on lactate but not on glucose in a defined medium was increased in the presence of nitrate. In cell suspensions glycerol, glucose, lactate, and propionate were utilized as electron donors for nitrate reduction to nitrite. Nitrate reduction was also found in cells grown in the absence of nitrate. Cytochrome b, found in the organism, was reduced by lactate and oxidized by nitrate or by fumarate in cell suspensions and in cell‐free extracts.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.