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Controlling Disease

Controlling Disease. We are an attractive dish for microbes!. 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 -.

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Controlling Disease

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  1. Controlling Disease We are an attractive dish for microbes!

  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 -

  3. Louis Pasteur

  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?

  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

  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

  7. Testing for Antibiotic Resistance in Bacteria Clear of bacteria Discs of different antibiotics Bacteria colonies growing near disc of antibiotic

  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

  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.

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