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Micro-organismsMicro-organisms
The word MICRO
means very small.
(So you need a
Microscope to see
it!)
icro-organism an!
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Micro-organismsMicro-organisms
icro-organisms
Micro- very small
Organism- a living thing.
So Micro-organisms are verysmall living things!
N.B Viruses are often classed as micro-
organisms but technically they are NON-Living
so call them Microbes instead!
Micro-
oranismman
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BacteriaThe good the bad and the ugly!
acteria are small livin sinle celled
oranisms that can come in ood
("ene#icial) #orms and "ad (pathoenic)
#orms that cause disease.
Some
different
shapes of
bacteria
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Structure of bacteria
Flagellum (Tail for movement)
Cell wall
Cell
membrane Slimy capsule
Strand
of DNA
Cytoplasm
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acteria can dou"le in num"er
every $% minutes!
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The motility (movement) o# some
"acteria in culture.
Pseudomonas aeruginosa
&ow #ast!
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uring this lesson e are going
to gro some of the bacteria
that are found in this room on a"etri dish ##. $e%citing stuff huh!&
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Good bacteria
id you 'no (arts are made from
methane gas hich is "roduced by
the bacteria in your gut)
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Good bacteria
Bacteria help to
break down
faeces (poo) in
sewage works.
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Bad bacteria in the mouth
cause teeth to rot.
Mouth bacteria
Mouth bacterium
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su"erbug!
Methicillin *esistant
taphylococcus ureus ethicillin
$an
antibiotic&
,ONT
,or' to
cure this
infection!
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VirusesViruses are e%tremely small
iruses are e%tremely small
$much smaller than bacteria&much smaller than bacteria&
NON-LVN/ microbes that need
ON-LVN/ microbes that need
a host cell so that they can
host cell so that they can
re"roduce and survive.e"roduce and survive.
'O'-II'*
"ecause they
do not #ul#il all o# theMRS *R+' criteria.
It,s not popcorn! It,s a
picture o# a virus!
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Structure of viruses
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How viruses replicate inside cells
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Examples of viruses
A T4 bacteriopage! Tisinfects only bacterial cells"in tis case only #! coli
Te $%& virus! Tis attac'sT4 lympocytes! %t isresponsible for A%DS!
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One sneeze can transmit many cold virusparticles
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Bird u virus
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Measles virus
Electron microscope picture of the
measles virus
Boy with measles
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Viruses cause cold sores warts
and verucae
F t d th di i d
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Foot and mouth disease is caused
by a virus and is E!" infectious
for cows
#o this
From this
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!reatment of viral infections
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"un#iuni are oranisms that produce spores
and come in the #orm o# moulds yeasts
mushrooms and toadstools.
They also help thins to rot and "rea/downwhich is an essential process in the cycle o#
li#e.
0hy did the mushroom want
to o out with the toadstool1
ecause he was a uni to "e
with!
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Examples of fun#iExamples of fun#i
Mould growing aMould growing abread bunbread bun
Yeast cells budding Yeast cells budding
There can "e ood #orms o#
#unus (used to ma/e"read2"eer) and "ad #orms
(Mould 3thletes #oot and
thrush).
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Mould and fungus causesMould and fungus causes
things to brea'donthings to brea'don
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Fungus taking over
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Athletes foot
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Oral t$rus$Oral t$rus$
Thrush yeast cells
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$So a "athogen$So a "athogen
is the scientific name for ais the scientific name for a germgerm!&!&
A Pathogen is something that
causes disease
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Some micro-oranisms are +R4
pathoenic and 53'*+RO6S
So you have to be su"er careful!
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How well do you wash yourhands?
