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Transcript
Bacteria and Germs In Our Environment What are bacteria and germs? • Ubiquitous-They are everywhere. • Reproduce very quickly – Fastest is approximately 15 min/generation – Evolve very fast • Antibiotic resistance Anti-biotics • Bacteria cells multiply rapidly • They grow immunity to anti-biotics – Weak bacteria die – Strong bacteria survive and multiply • If the medicine isn’t finished the bacteria cells will be able to ignore the medicine you take – Very bad – anti-biotic resistance • Anti-biotic soaps – Not good to use all the time due to anti-biotic resistance Different kinds of bacteria and germs • Important ecological roles. – Decomposers – heterotrophic (can’t make own food) bacteria – Symbionts – live with or in other organisms • Intestinal “flora” – help us digest our food – Pathogens – microbes that cause disease • Botulism – improperly canned foods • E. coli – improperly cooked beef • Salmonella – improperly cooked chicken Bacteria Pseudomonas aeruginosa Consider organisms in the photograph to the left. These are bacteria, Pseudomonas aeruginosa, a human pathogen that is a particular problem in the lungs of cystic fibrosis patients. A thousand of the these would fit on the period at the end of this sentence. A white blood cell engulfing disease-causing bacteria Bacillus Bacterium Anthrax Bacteria E. coli Salmonella