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Slide 1 - Controlling Disease We are an attractive dish for microbes!
Slide 2 - Louis Pasteur People thought that food went off because it was in contact with air. They thought: Air + food microorganisms grow Pasteur said that microbes come from microbes He did som experiments to prove this -
Slide 3 - Louis Pasteur
Slide 4 - Pasteur’s Experiment He poured some grape juice in 2 flasks He then produced a ‘swan neck’ in the glass He heated the flasks to boiling One flask was left The other had its neck broken off Which went off? Why?
Slide 5 - Pathogens = microorganisms which cause disease Drugs are used to help people with diseases Painkillers – relieve the symptoms without curing the disease Antibiotics – chemicals which kill bacteria, but not viruses. Viruses develop in cells and are hard to kill
Slide 6 - Bacteria Drug Resistance Bacteria in nature are varied. A few have the resistance to antibiotic When the antibiotic is used there is a natural selection for the bacteria with the most drug resistance. These survive and breed and become more common
Slide 7 - Testing for Antibiotic Resistance in Bacteria Clear of bacteria Bacteria colonies growing near disc of antibiotic Discs of different antibiotics
Slide 8 - Antibiotic Resistance in Bacteria Many strains of bacteria have resistance to antibiotic due to natural selection So we need a range of antibiotics to fight disease with the best one for the job To slow down more antibiotic resistance developing in pathogenic bacteria we need to avoid over using antibiotics
Slide 9 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.