bio
- Created by: hattie townsend
- Created on: 07-03-16 14:56
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- B1.1 - Keeping Healthy
- Treatment of disease
- Some medicines such as painkillers relieve the symptoms of infectious diseases, but they don't kill pathogens
- Antibiotics kill infective bacterial pathogens inside the body. Antibiotics have greatly reduced the number of deaths.
- Antibiotics don't kill viral pathogens which live and reproduce inside cells.
- An epidermic is a local outbreak of disease. A pandemic is a global outbreak of disease and affects more people
- Pandemics kill more people than epidermic
- Antibiotic Resistance
- Many strains of bacteria have developed resistance to antibiotics as a result of natural selection
- Antibiotic-resistant strains occur when pathogen mutate
- 1) A pathogen mutates, producing a new strain
- 2) New strain may be resistant
- 3) The new resistant strain spreads rapidly because we are not immune to it and there is no effective treatment
- Increase in the number of resistant strains:
- Overuse of antibiotics and prescribing inappropriateantibiotics
- Investigating Microorganisms
- You can investigate the effect of disinfectants and antibiotics on microorganisms in the lab using an uncontaminated culture of microorganisms
- Agar is commonly used
- Nutrients are added to the agar to provide ideal growing conditions
- Preparing Uncontaminated Culture
- 1) Sterilise petri dishes in autoclave, high pressure to kill unwanted
- 2) Sterilise inoculating loops, bunsen burner
- 3) Transfer of microorganisms onto petri dish
- 4) Sealing petri dish - tape
- Treatment of disease
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