Related Experiment Video
Updated: Jan 26, 2026

Breast Milk Enhances Growth of Enteroids: An Ex Vivo Model of Cell Proliferation
Published on: February 15, 2018
Growth and Death of Selected Microorganisms in Ultrafiltered Milk
Patricia Haggerty1, Norman N Potter1
1Department of Food Science, Cornell University, Ithaca, New York 14853.
Abstract:
Studies were made to compare the growth and death of Staphylococcus aureus , Streptococcus faecalis and Escherichia coli in skim milk concentrated by ultrafiltration to that in unconcentrated skim milk. Skim milk was volume concentrated to 2× in laboratory-scale stirred UF cells. Behavior of the organisms was analyzed in four inoculated milk samples: 2× retentate, 1× water-diluted retentate, milk equivalent (retentate plus permeate) and unconcentrated skim milk. Growth of each organism and of total aerobes did not vary in the four milk samples at either 7 or 13°C. For S. faecalis and E. coli , D-values for samples heated to 62.7°C did not significantly differ in the four milk samples (p>0.01). The D-value of S. aureus in water-diluted retentate was slightly but significantly lower than those in the other three milk samples (p<0.01), possibly due to the lowered lactose level in this sample.
Related Concept Videos
Types of Microorganisms
Mutations in Microorganisms
Environmental Applications of Microorganisms
Microorganisms in Medicine and Therapeutics
Microorganisms in Agriculture and Food industry
What is Natural Selection?

