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What are Microbes?

What are Microbes?. Also called prokaryotes Domains Bacteria and Archaea. Microbes. Pin Point. Bacteria. Microbes lived alone on Earth for over 1 billion years Most numerous and widespread organisms on Earth

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What are Microbes?

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  1. What are Microbes?

  2. Also called prokaryotes • Domains Bacteria and Archaea

  3. Microbes Pin Point Bacteria • Microbes lived alone on Earth for over 1 billion years • Most numerous and widespread organisms on Earth • More bacteria live in your mouth than the total number of humans that have ever lived! • There are ten times as many bacteria living in and on your body as the number of cells in your body!

  4. What do microbes do on Earth? • Although some bacteria can cause disease, most bacteria on our bodies are neutral/beneficial • Decompose dead skin cells • Supply essential vitamins • Guard against pathogenic organisms • Prokaryotes in soil decompose dead organisms, sustaining chemical cycles

  5. How small is a microbe? Vary between 0.1 to 10 μm

  6. What does a microbe look like?

  7. Microbe Parts • Flagella and cilia • Aid in movement • Membrane and Envelope • Aid in enclosure and protection Flagellum Motility Plasma membrane Cell wall Rotary movement of each flagellum

  8. Tardigrades • Small microscopic organisms ranging from .1-1.5mm • Can survive extreme temperatures from -273ºC to 151ºC • Can go a decade without water Tardigrade

  9. Tardigrades in Space • Were sent to space for 10 days where the sun’s UV rays were 1000x stronger • Majority survived and reproduced successfully • First creature ever known to survive open space

  10. Bacterial Growth How fast do bacteria grow? Bacterial Growth Video

  11. Bacterial Growth Model • When do bacteria double in number? At every Time Step (TS)  every 20 minutes Bacteriacurrent TS = 2 x Bacteriaprevious TS

  12. Notations • What does Bacteriacurrent TS mean? • Bacteriacurrent TS is the number of bacteria at the current time step

  13. Let’s look at bacterial growth! • You will start with 1 bacteria • When time is called, you will double the amount of bacteria • Record the amount of bacteria present at each Time Step

  14. Bacteriacurrent TS = 2 x Bacteriaprevious TS

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