Introduction Microbes are found everywhere and are the oldest from of life on Earth. They are so small that millions can fit into the eye of a needle and most microbes are harmless and are crucial for our existence on Earth. Not all microbes are harmless and many in fact can cause serious damage to plants, animals and humans. A pathogen is anything that can cause a disease or illness to its host and includes worms, bacteria, protozoa, viruses and fungus. This report will focus on food preservation which has been an issue for mankind ever since we started to package food and not eat it straight after we prepared it. The spread of disease is crucial in all aspects of microbiology and aseptic techniques are now followed by medical
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Measure turbidity of the Petrie dishes and record results
Follow aseptic techniques
Aseptic techniques:
Sterilise forceps
Sterilise pipette after each different solution was used.
Lab Coats
Variables:
Independent- different solutions, temperature
Controlled- amount of liquid, three peas per test tube, cotton ball on top of tube, time
Constant- 24mL of solution per Petrie dish
Dependant- Turbidity, microbial growth
Results
The peas were only going to be covered in 24mL of solution to keep it consistent with the first two experiments. As the Petrie dish has a larger surface area compared to the test tubes, 24mL of solution didn?t properly cover the peas so it was decided to add more concentration of the solution to make sure that all of the peas were covered. Adding a larger concentration of solution allowed the three experiments conducted to all have the peas completely covered by solution. If the amount of solution was kept at 24mL the air above the peas could have potentially dictated the results and made it
Measure turbidity of the Petrie dishes and record results
Follow aseptic techniques
Aseptic techniques:
Sterilise forceps
Sterilise pipette after each different solution was used.
Lab Coats
Variables:
Independent- different solutions, temperature
Controlled- amount of liquid, three peas per test tube, cotton ball on top of tube, time
Constant- 24mL of solution per Petrie dish
Dependant- Turbidity, microbial growth
Results
The peas were only going to be covered in 24mL of solution to keep it consistent with the first two experiments. As the Petrie dish has a larger surface area compared to the test tubes, 24mL of solution didn?t properly cover the peas so it was decided to add more concentration of the solution to make sure that all of the peas were covered. Adding a larger concentration of solution allowed the three experiments conducted to all have the peas completely covered by solution. If the amount of solution was kept at 24mL the air above the peas could have potentially dictated the results and made it