bacteria growth stages
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what is the lag phase of bacterial growth (summary)
Bacteria adapt to the environment, little to no division.
what is the log phase of bacterial growth (summary)
Rapid cell division and growth.
what is the stationary phase of bacterial growth (summary)
Nutrients run low, waste builds up; growth rate slows and plateaus.
what is the death phase of bacterial growth (summary)
Nutrients exhausted, toxic wastes increase; cells die off
what happens during the lag phase of bacterial growth
• immediately after bacteria are introduced • bacteria are metabolically active but not dividing or are but very slowly. • adapting to their surroundings by synthesizing enzymes, proteins, and other molecules necessary for growth. • length of the phase varies depending on the condition of the bacteria and the environment • No significant increase in bacterial numbers
what happens during the log phase of bacterial growth
• divide at constant and rapid rate. • population size doubles regularly in a process called binary fission • phase of maximum growth rate - bacteria are most metabolically active. • Cells are healthiest and most sensitive to antibiotics • The length of phase depends on nutrient availability and environmental conditions.
what happens during the stationary phase of bacterial growth
• nutrients deplete, waste products accumulate - growth rate slows • number of new cells produced equals the number of cells dying. • population size is roughly constant. • begin to produce spores or other survival structures to endure harsh conditions. -phase reflects stressful environmental conditions.
what happens during the death phase of bacterial growth
• nutrient supply exhausted, toxic waste products reach harmful levels. • More cells die than are produced, population decline. • phase continues until most cells have died or until conditions improve. • Some cells may survive by entering a dormant state.
why is it important to understand the phases of bacterial growth
• when to apply antibiotics • food storage recommendations • culturing bacteria at optimal growth times.