Cultivation of salt-sensitive strains: Growth of Escherichia coli and other bacteria when NaCl may inhibit growth or affect phenotype.

Plasmid propagation: Maintenance and amplification of plasmids in Escherichia coli under low-ionic-strength conditions.

Competent cell recovery: Post-transformation/electroporation recovery of Escherichia coli where reduced salt improves cell viability.

Bacteriophage work: Propagation and plaque assays (e.g., λ, M13) where low Na+ supports adsorption and infection dynamics.

Osmotic stress studies: Screening and characterization of osmosensitive mutants and salt-response phenotypes.

Protein expression: Expression in Escherichia coli for targets (e.g., membrane/ion-transport proteins) sensitive to Na+ levels.

General low-salt cultivation: Routine culture when reduced ionic strength is desired to minimize Na+-dependent effects.