B5.4 - Preventing Bacterial Growth (Finished) Flashcards
How often do bacteria multiply
Every 20 minutes in right temperature and having enough nutrients
How can you investigate the effect of antibiotics and disinfectants on bacterial growth?
Using agar plates and calculating the cross sectional area of colonies grown or of clear areas of agar (using pie and circle maths)
What do you need to calculate the no of bacteria after a certain time?
The mean division time
What are disinfectants?
Chemicals used to kill bacteria around us
What are antiseptics?
Antiseptics are Disinfectants safe tu use on human skin
What are antibiotics?
Antibiotics are chemicals that can be used inside our bodies
Briefly how do you set up an investigation for the effects of disinfectants?
Adding circles of filter paper soaked in them to the culture plate
