Transcript You and your oral flora

You and your oral microflora
A module in seven parts…
Overall learning objectives
-why are we doing this?
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…
• You will be able to describe (some of) the
microbes that lie in and on the human body
• 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
• Find a good Electron
micrograph image of
each category here…
• Prokaryotes
– Bacteria
– Archaea
• Eukaryotes
– Could also use this
opportunity to get
student responses for
examples of each
– Fungi
– Protists
– Green Algae
• Viruses
There are LOTS of microorganisms
• 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: 1022
• Insert fun cartoon
•
of bacteria here
(e.g. search for •
“The fantastic
•
world of
•
Microbiology”)
•
Number of Microorganisms: 1031
• 99% of microorganisms are uncharacterized!
Yes, microbes cause disease…
• Insert pie chart of
Infectious Disease
Deaths
Worldwide…good
sources include CDC or
WHO, but others also
useful
– http://www.who.int/mediacentre/fac
tsheets/fs310/en/
– http://www.childinfo.org/mortality_u
nderfive.php
• 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!
– (some estimate 1 every
30 seconds)
…but most microbes are BENEFICIAL!
Maintain
ecosystems
Help their hosts
– Insert image
of intestines
here
• Aid digestion
• Make vitamins
• Detoxify
chemicals
• Develop the
immune system
• Fight off
invaders
– Insert lovely
landscape
•
•
•
•
Cycle nutrients
Cycle metals
Decompose
Fix O2, CO2 and
N2
• Food source
• Bioremediation
Alter climate
– Insert storm
image here
• Seed clouds
• Nucleate ice
crystals
• Produce O2
• Sequester CO2
To the module!