You and your oral flora
You and your oral microflora
A module in seven parts…
Overall learning objectives
-why are we doing this?
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At the end of this module, you will be able to do the following: describe (some of) the microbes that live in and on the human body.
explain the roles that microbes play in both human and health and disease, in particular the role that microbes play in immunity differentiate between DNA replication as it occurs within a cell and as it occurs inside of a test tube.
navigate sources of information about microorganisms and be able to discriminate between accurate and inaccurate sources.
Learning objectives for today…
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You will be able to describe (some of) the microbes that lie in and on the human body
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Just to become comfortable working and thinking about microbes
Find a background image of bacteria adhering to a surface for this slide; good source: Science Photo Library or the ASM Microbe Library
What Are Microbes?
Types of microbes
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Find a good Electron micrograph image of each category here…
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Could also use this opportunity to get student responses for examples of each
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Prokaryotes
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Bacteria
Archaea
Eukaryotes
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Fungi
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Protists
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Green Algae
Viruses
There are LOTS of microorganisms
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Insert fun cartoon
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of bacteria here
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(e.g. search for
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“The fantastic
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world of
Microbiology”)
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Number of galaxies: ~ 350 billion
Stars in the Milky Way: 200-400 billion
US National Debt: 15.9 trillion (as of
8/2012)
Cells in the human body: 50-75 trillion
Number of visible stars: 10
22
Number of Microorganisms: 10
31
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99% of microorganisms are uncharacterized!
Yes, microbes cause disease…
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Insert pie chart of
Infectious Disease
Deaths
Worldwide…good sources include CDC or
WHO, but others also useful
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http://www.who.int/mediacentre/fac tsheets/fs310/en/
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http://www.childinfo.org/mortality_u nderfive.php
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Second leading cause of death worldwide
Dental plaque is the most widespread
Tuberculosis affects 1/3 of world
A child dies of malaria every minute!
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(some estimate 1 every
30 seconds)
…but most microbes are BENEFICIAL!
Help their hosts
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Insert image of intestines here
Maintain ecosystems
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Insert lovely landscape
Alter climate
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Insert storm image here
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Aid digestion
Make vitamins
Detoxify chemicals
Develop the immune system
Fight off invaders
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Cycle nutrients
Cycle metals
Decompose
Fix O
2
, CO
2
N
2 and
Food source
Bioremediation
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Seed clouds
Nucleate ice crystals
Produce O
2
Sequester CO
2
