Shanisha Gustus & Anell Delgado 710

How will temperature change affect the growth of

bacteria?

Question:

Variables

Constant: Amount of temperature solution in each beaker, amount of salt and vinegar, amount of time in each place

IV: Temperature changeDV: The growth of bacteria

If we place the solution in a warmer environment, then the bacteria will develop faster than the solution in a cooler place because in order to keep foods fresh, you refrigerate them as they get spoiled, growing bacteria on a room temperature place

Background InfoBackground Info

Lower temperature will inhibit or completely stop bacteria growth, but not kill bacteria. The best temperature for fastest growth of some bacterial strains (such as Ecoli) is the human body temperature at 37c. However most species cannot survive in extreme temperatures. One way to kill common bacterial pathogens using heat is boiling a common sterilization technique.

MaterialMaterial6 200mL beakers 2 beef bouillon cubes Teaspoons Vinegar water salt

1: Label six 200-mL beakers 1-6. Dissolve beef bouillon cubes in 600 ml of hot water. Measure then pour 100 ml of this soulution into each beaker.

2. Add a teaspoon of salt to 1 and 2, a teaspoon of vinegar to 3 and 4, and add nothing to 5 and 6.

Continuation

3. Place 1,3, & 5 in a warm place and 2,4 & 6 in a refrigerator 

4. Observe the beakers after 48 hours.Materials: 6 200mL beakers, 2 beef bouillon cubes, salt, vinegar, teaspoons & water.

time Cold environment Hot environment

Day 1 /24 hrs No change No change

Day 2/48 hrs No change No change

Day 3/72hrs No change No change

Day 4/ 96hrs No change No change

Day 5/120hrs Water starts to evaporate and color starts to change in the containers

Color starts to change in all three containers

Day 6/ 144hrs Some water evaporated and the hardness starts

color still changes and mold starts to grow

Day 7/168hrs Most water evaporated and the remains was hard

Some water evaporated and color changes

Pictures

CONCLUSION How will temperature change affect

the growth of bacteria? Temperature change will affect the

growth of bacteria because the bacteria will grow faster in one climate than the other. In this case the three cups that was left out grew bacteria faster than the one in the refrigerator .

Bibliography Bibliography

Wikianswers.com Bbq-brethren.com Ehow.com