Microorganisms Where do microbes live Where do microorganisms

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. Agar is special jelly; it contains all the nutrients bacteria and fungi need to grow. Molten agar is poured in Petri dishes.

Step 1 lid bottom with agar lid Turn your Petri dish upside down

Step 2 bottom On the bottom of your Petri dish write your initials and the date

Step 3 bottom Mark the bottom of your Petri dish into quarters

Step 4 bottom In each quarter write what you are swabbing

Step 5 lid bottom with agar lid Flip 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 dish Wiggle 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 ü Write around the edge of the Petri dish ü The dustiest objects don’t necessarily have the most microbes ü Only seal the Petri dish at 4 points ü When you’re finished wash your hands

b e r t o und e Complete record sheet Include: - your name - what you swabbed

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=5 Xi 2 Nc 1 Uic. Q

Where do microbes live? DO NOT open your Petri dishes Is it round and smooth? You have found bacteria Is it hairy or fuzzy? You have found fungi What colour is it? What size is it? Different colours and size mean different types of bacteria/fungi.

Where do microbes live? 1. 2. 3. 4. Write the title “where do microbes live? ” in your jotter Stick the records of your swabbing in your jotter Draw your results on your record sheet Copy the table below (use a ruler) Object Scale of microbial growth

How much growth? Complete your results table using the diagram below to help you decide how much growth is on your plate. Completely covered in growth 3 2 Mostly covered in growth Nothing is growing 0 1 A couple areas of growth

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

Next day. . . What do microorganisms need to live?