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Microorgan isms Where do microbes live?

Microorganisms

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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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Page 1: Microorganisms

MicroorganismsWhere do microbes live?

Page 2: Microorganisms

Where do microorganisms live?

Where in the classroom do you think we would find the most microorganisms?

Page 3: Microorganisms

Gather Round

Page 4: Microorganisms

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.

Page 5: Microorganisms

Step 1

bottom with agar

lid

bottom with agar

lid

Turn your Petri dish upside down

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Step 2

On the bottom of your Petri dish write your initials and the date

bottom

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Step 3

Mark the bottom of your Petri dish into quarters

bottom

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Step 4

In each quarter write what you are swabbing

bottom

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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

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Step 6

Take the lid off your Petri dishWiggle your cotton bud on the agar GENTLY

Remember to put it in the

right quarter

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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

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Step 8

When you have tested 4 objects seal your dish with 4 pieces of sellotape

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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

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Complete record sheetInclude:

- your name- what you swabbed

Remember to write around

the edge

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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?

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Microorganism Reproduction

The number of microorganisms doubles every 20 minutes…

…if you start with 1 microbe how many will there be after 4 hours?

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0 minutes = 1 Bob

Page 18: Microorganisms

20 minutes = 2 Bobs

Page 19: Microorganisms

40 minutes = 4 Bobs

Page 20: Microorganisms

60 minutes = 8 Bobs

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80 minutes = 16 Bobs

Page 22: Microorganisms

100 minutes = 32 Bobs

Page 23: Microorganisms

120 minutes = 64 Bobs

Page 24: Microorganisms

140 minutes = 128 Bobs

Page 25: Microorganisms

160 minutes = 256 Bobs

Page 26: Microorganisms

180 minutes = 512 Bobs

Page 27: Microorganisms

200 minutes = 1024 Bobs

Page 28: Microorganisms

220 minutes = 2048

Page 29: Microorganisms

240 minutes = 4096

Page 30: Microorganisms

260 minutes = 8192

Page 31: Microorganisms

280 minutes = 16,384

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Microbe Multiplication Song!

http://www.youtube.com/watch?v=5Xi2Nc1UicQ

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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

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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

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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

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What is the dirtiest object in the classroom?Object Scale of microbial growth Average growth

Page 37: Microorganisms

Next day...

What do microorganisms need to live?