Repeat the procedure for all four organisms. Streak them in their appropriately labeled quadrants. Repeat the inoculation procedure, as described in the video, for the remaining 3 plates. All four organisms will be tested for growth on medium containing varying concentrations of sucrose: 0. Test Organisms: Saccharomyces cerevisiae Staphylococcus aureus Escherichia coli Halobacterium salinarium.
Also label the bottom of the plates with your initials, lab section, and the sucrose concentration of the plate. University Ave. Visit Campus. Download Viewbook. Give to UW. Environmental Influences: Osmotic Pressure. May 23, The availability of water is the critical factor that affects the growth of cells.
We can classify bacteria according to their growth response to salt. Related questions How do bacteria differ from a virus? How do cyanobacteria affect the planet's atmosphere? What are some examples of cyanobacteria? What are some examples of bacteria?
What are bacilli? Removal of water and addition of salt to meat creates a solute-rich environment where osmotic pressure draws water out of microorganisms, thereby retarding their growth.
Sugar is used to preserve fruits, either in syrup with fruit such as apples, pears, peaches, apricots, plums or in crystallized form where the preserved material is cooked in sugar to the point of crystallisation and the resultant product is then stored dry. The purpose of sugaring is to create an environment hostile to microbial life and prevent food spoilage. From time to time, sugaring has also been used for non-food preservation. For example, honey was used as part of the mummification process in some ancient Egyptian rites.
However, the growth of molds and fungi is not suppressed as efficiently as the growth of bacteria. Key Takeaways. When a cell is placed in a hypertonic solution, water actually flows out of the cell into the surrounding solution thereby causing the cells to shrink and lose its turgidity.
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