@article{mcdonald_fleming_daeschel_1991, title={ACIDIFICATION EFFECTS ON MICROBIAL-POPULATIONS DURING INITIATION OF CUCUMBER FERMENTATION}, volume={56}, ISSN={["0022-1147"]}, DOI={10.1111/j.1365-2621.1991.tb04771.x}, abstractNote={ABSTRACT Addition of acetic acid (0.067M) or calcium acetate (0.133 M) to the cover brine (1.94M NaCl) of cucumbers reduced naturally occurring Enterobacteriaceae, but not lactic acid bacteria (LAB), during the first 5 days after brining. Naturally occurring LAB were predominantly heterofermentative (≥ 80%) 1 day after brining and homofermentative (≥ 90%) on the 5th day. Enterobacteriaceae survived longer within cucumbers than in brine, particularly in nonacidified cucumbers. Starter cultures of Lactobacillus plantation or Pediococcus pentosaceus decreased 90–99.9% during the first 10 hr after addition and did not increase until about 30 h after brining. Obtaining predominant fermentation of brined cucumbers by added cultures was difficult due to presence of natural microflora on/in the cucumbers and the harsh environment of the brine (high salt, low nutrients).}, number={5}, journal={JOURNAL OF FOOD SCIENCE}, author={MCDONALD, LC and FLEMING, HP and DAESCHEL, MA}, year={1991}, pages={1353-&} } @article{mcdonald_hassan_fleming_daeschel_1991, title={Use of continuous culture for internal pH determination of lactic acid bacteria}, volume={8}, ISSN={0740-0020}, url={http://dx.doi.org/10.1016/0740-0020(91)90006-n}, DOI={10.1016/0740-0020(91)90006-n}, abstractNote={The response of cytoplasmic pH to external cellular pH was shown to be influenced by the growth phase forLeuconostoc mesenteroides, but not forLactobacillus plantarum. A continuous culture system was shown to reduce growth phase effects, and offer the advantage of more consistency in internal pH values. Oxygen, manganese, cell density, external pH, and organic acid production were shown not to influence the internal pH of these bacteria when grown in continuous culture.}, number={2}, journal={Food Microbiology}, publisher={Elsevier BV}, author={McDonald, L.C. and Hassan, H.M. and Fleming, H.P. and Daeschel, M.A.}, year={1991}, month={Jun}, pages={137–142} } @article{mcdonald_fleming_hassan_1990, title={Acid tolerance of Leuconostoc mesenteroides and Lactobacillus plantarum}, volume={56}, number={7}, journal={Applied and Environmental Microbiology}, author={McDonald, L. C. and Fleming, H. P. and Hassan, H. M.}, year={1990}, pages={2120} }