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Bacteria: Kingdom Monera (bacteria)
All prokaryotic cells Nucleiod (free-floating DNA) Reproduce by binary fission Do have sex pili Cell walls are unique Archaebacteria and Eubacteria Autotrophic and Heterotrophic 3 shapes and 3 arrangements Aerobic and Anaerobic
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Name that bacteria!
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Gram Positive and Gram Negative
Thick cell walls that hold stain (Crystal Violet) Thin cell walls that don’t hold stain (Crystal Violet)
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Importance to us: They make us well (cleaners, digestion, keep bad guys in check). They make us sick Decomposition (vacuums) Nitrogen Fixation Our atmosphere Food production (yogurt, cheeses, sour dough) Genetic engineering (plasmids)
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Messy Mr. Fleming Discovered penicillin after returning from vacation in 1928 First clinical trial were performed in by Howard Florey and Ernst Chain in Boston on burn patients (national headlines)
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Antibiotics Manufactured the most during and after WWII
First resistance was seen in the 1950’s (60% of Staph. aureas was resistant) Modes of action/destruction: cell wall synthesis, cell membrane function, protein synthesis, DNA and RNA inhibition, inhibit another metabolic practices
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Some Antibiotics (G+ and G-)
Cell walls: Beta-lactam rings (penicillin, ampicillin, imipenem) Glycopeptides: Vancomycin Protein synthesis: tetracycline, erythromycin, azithromycin, chloramphenicol DNA/RNA: ciprofloxacin, levofloxacin (floroquinolones), Flagyl
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Kirby-Bauer Disk Diffusion Susceptibility Testing and the “MIC test”
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Intrinsic and Acquired Resistance
Intrinsic = natural mutations Acquired = sharing plasmids-genetic transfer between resistant/nonresistant bacteria, mis- and over use of antibiotics (broad spectrum and human behavior), don’t use enough or you stop using it prematurely
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