For cell in isotonic solution, the rate of water inflow into the cell and out flow equalizes. Sodium chloride solution of 0.9 is isotonic to animal cell. On the other hand, hypotonic is a term used to describe a solution with more water and less solutes compared to that that of a cell or another solution (Excerpta medica foundation, 2007). When a cell is in hypotonic solution, water moves into the cell. Finally, hypertonic refers to a solution with more solutes and less water compared to that of a cell or another solution.
Staphylococcus epidermis exhibits less or no growth in a solution of sodium chloride of 1%. In solution of 7% and 15% staphylococcus epidermis increased in number and in size. At 1% solution of sodium chloride saccharomyces cerevisiae exhibited growth and reproduction. While at 7% and 15% they died because they could not withstand the osmotic pressure created.
This shows that staphylococcus epidermis is highly resistant at high concentration of Sodium chloride and low resistance at low concentration of sodium chloride. On the other hand, saccharomyces cerevisiae are less resistant to high concentration of sodium chloride (excerpta medica foundation,