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The Streptococci are a part of the normal human flora. The streptococci are widely distributed in nature and frequently form part of the normal human flora (seeTable 29-1). Approximately 5-15% of humans carry S pyogenes or S agalactiae in the nasopharynx. Please see:http://www.ncbi.nlm.nih.gov/books/NBK7611/#!po=51.4706 for more details on ...


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You might need to demote your single-celled 'lords' to 'squires'. They're not essential to an individual's life. You wouldn't die (dispensing with the "how" right off the bat.) You'd be just fine if no bacteria reentered your body. Your fecal output would be greater; you would derive somewhat less nutrition from your food, you would need to take vitamin K, ...


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Plasmids do have the advantage that they replicate independently of the cells chromosome and that they can be transferred between different bacteria. This spreads the gene encoded by the plasmid to other bacteria, which then can also survive. Think about antibiotic resistance. Bacteria which have a plasmid which allows protection against the antibiotic will ...


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I agree with canadianer that chemical tests are generally more useful for identification. However, morphology does help and some staining techniques can be useful for identification (the Gram stain is the obvious one). If you are looking for a microscope, look for a nice scope with a 100x oil-immersion objective and a 10x ocular lens (12x would be OK too). ...


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The problem lies in soil bacteria. There has been a project on a larger scale: Biosphere 2. After their initial trial they realised $O_2$ levels are getting much lower from what was predicted. The scientists team investigated the problem deeper and came to the conclusion that there was a lot of dead organic matter in the soil, which got consumed by aerobic ...



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