microbes_2

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					       Micro-
     organisms
               The word MICRO
               means very small.
               (So you need a
               Microscope to see
               it!)

Micro-organism Man!
                                   
             Micro-
           organisms
            Micro-organisms
            Micro- very small
            Organism- a living thing.

            So Micro-organisms are very
            small living things!
            N.B Viruses are often classed as micro-
            organisms but technically they are NON-Living
            so call them Microbes instead!

Micro-
organism                                              
man
   Bacteria
        The good the bad and the ugly!
     Bacteria are small living single celled
     organisms that can come in good
     (beneficial) forms and bad (pathogenic)
     forms that cause disease.

    Some
    different
    shapes of
    bacteria
Structure of
  bacteria
 Flagellum (Tail for movement)        Cytoplasm


                                          Strand
                                          of DNA




                                           Cell wall


                   Cell
                 membrane        Slimy capsule
Bacteria can double in number
      every 20 minutes!
 The motility (movement) of some
       bacteria in culture.


How fast!
                     




       Pseudomonas aeruginosa
During this lesson we are going
 to grow some of the bacteria
that are found in this room on a
 petri dish ……. (exciting stuff huh!)
Good bacteria




                          
Did you know Farts are made from
methane gas which is produced by
the bacteria in your gut?
Good bacteria

     Bacteria help to
     break down
     faeces (poo) in
     sewage works.
  Bad bacteria in the mouth
     cause teeth to rot.
Mouth bacteria



                       Mouth bacterium
MRSA- the bacterial superbug!
      Methicillin Resistant
   Staphylococcus aureus
                       Methicillin
                       (an
                       antibiotic)
                       WON’T
                       Work to
                       cure this
                       infection!




                                
                      It’s not popcorn! It’s a
                            picture of a virus!




Viruses
Viruses are extremely small
 (much smaller than bacteria)
NON-LIVING microbes that need
  a host cell so that they can
    reproduce and survive.

                              NON-LIVING
                              because they
                       do not fulfil all of the
                       MR. PRASH criteria.
Structure of
   viruses
  How viruses
replicate inside
     cells
Examples of
  viruses




A T4 bacteriophage. This        The HIV virus. This attacks
infects only bacterial cells,   T4 lymphocytes. It is
in this case only E. coli       responsible for AIDS.
   One sneeze can
transmit many cold
  virus particles




         
Bird flu virus


      
Measles virus




                   Electron microscope
                   picture of the
                   measles virus



Boy with measles
Viruses cause
 cold sores,
  warts and
   verucae
 Foot and mouth disease is caused
 by a virus and is VERY infectious
              for cows
From this




            To this
 Treatment of
viral infections




      
Fungi
                         Why did the mushroom want
                         to go out with the toadstool?
                         Because he was a Fungi to be
                         with!

 Fungi are organisms that produce spores
 and come in the form of moulds, yeasts,
       mushrooms and toadstools.
                     
They also help things to rot and breakdown
which is an essential process in the cycle of
                     life.
Examples of
   fungi

                           Mould growing a
                           bread bun




   There can be good forms of
   fungus (used to make
   bread/beer) and bad forms
   (Mould, Athletes foot and
      thrush).

                           Yeast cells budding
Mould and fungus causes
  things to breakdown
  Fungus
taking over
Athletes
  foot
Oral thrush




       Thrush yeast
        cells
A Pathogen is
something that
causes disease


                 

           (So a pathogen
 is the scientific name for a germ!)
Some micro-organisms are VERY
 pathogenic and DANGEROUS




  So you have to be super careful!
How well do you
  wash your
    hands?

				
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posted:1/15/2013
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