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Microorganisms. Where do microbes live?. Where do microorganisms live?. Where in the classroom do you think we would find the most microorganisms?. Gather Round. How can we grow microorganisms?. Microbiologists grow bacteria and fungi on agar plates. - PowerPoint PPT Presentation
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MicroorganismsWhere do microbes live?
Where do microorganisms live?
Where in the classroom do you think we would find the most microorganisms?
Gather Round
How can we grow microorganisms?Microbiologists grow bacteria and fungi on agar
plates.
Agar is special jelly; it contains all the nutrients bacteria and fungi need to grow.
Molten agar is poured in Petri dishes.
Step 1
bottom with agar
lid
bottom with agar
lid
Turn your Petri dish upside down
Step 2
On the bottom of your Petri dish write your initials and the date
bottom
Step 3
Mark the bottom of your Petri dish into quarters
bottom
Step 4
In each quarter write what you are swabbing
bottom
Step 5
bottom with agar
lidbottom with agar
lidFlip over your Petri dish so the lid is back on top
Dip one of your cotton buds in water and rub what you want to test
Step 6
Take the lid off your Petri dishWiggle your cotton bud on the agar GENTLY
Remember to put it in the
right quarter
Step 7
Put the lid back on your Petri dish between each test
Put the used cotton bud in Vircon and use a new one for the next test
Step 8
When you have tested 4 objects seal your dish with 4 pieces of sellotape
Tips Write around the edge of the Petri dish
The dustiest objects don’t necessarily have the most microbes
Only seal the Petri dish at 4 points
When you’re finished wash your hands
Complete record sheetInclude:
- your name- what you swabbed
Remember to write around
the edge
Predictions
What do you think the dirtiest object in the classroom is going to be?
What do you think the agar plates will look like on Thursday?
Microorganism Reproduction
The number of microorganisms doubles every 20 minutes…
…if you start with 1 microbe how many will there be after 4 hours?
0 minutes = 1 Bob
20 minutes = 2 Bobs
40 minutes = 4 Bobs
60 minutes = 8 Bobs
80 minutes = 16 Bobs
100 minutes = 32 Bobs
120 minutes = 64 Bobs
140 minutes = 128 Bobs
160 minutes = 256 Bobs
180 minutes = 512 Bobs
200 minutes = 1024 Bobs
220 minutes = 2048
240 minutes = 4096
260 minutes = 8192
280 minutes = 16,384
Microbe Multiplication Song!
http://www.youtube.com/watch?v=5Xi2Nc1UicQ
Where do microbes live?
Is it round and smooth?
Is it hairy or fuzzy?
What colour is it? What size is it?
You have found bacteria
You have found fungi
Different colours and size mean different types of bacteria/fungi.
DO NOT open your Petri dishes
Where do microbes live?
1. Write the title “where do microbes live?” in your jotter2. Stick the records of your swabbing in your jotter3. Draw your results on your record sheet4. Copy the table below (use a ruler)
Object Scale of microbial growth
03
2 1
How much growth?Complete your results table using the diagram
below to help you decide how much growth is on your plate.
Nothing is growing
A couple areas of growthMostly covered in growth
Completely covered in growth
What is the dirtiest object in the classroom?Object Scale of microbial growth Average growth
Next day...
What do microorganisms need to live?