Transcript controlling microbes - powerpoint - Curriculum for Excellence Science

How dirty is your desk?
Which chemical cleans best?
Step 1
bottom with agar
lid
lid
bottom with agar
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 the object and which chemical was used
Step 5
lid
bottom with agar
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 disinfectant
Clean the object using your chemical and a paper towel, then re-swab onto agar
Step 8
When you have tested both object twice (clean and dirty) seal your dish with sellotape
How much growth?
Rate the level of growth 0, 1, 2 or 3
Completely covered in growth
3
2
Mostly covered in growth
Nothing is growing
0
1
A couple areas of growth
What cleans best?
Rate the level of growth 0, 1, 2 or 3
Chemical
Lemon Juice
Liquid Soap
Surface Cleaner
Mouthwash
Wipes
NOTHING
Individual Results
Class average
Use the class average results to construct a bar graph.
How is disease spread?
Eye
Produce tears which
contain a digestive juice
which digests pathogens.
Nose and Throat
Mucus traps pathogens and
hair brushes them out
Mouth
Ear
Produce wax to trap
any pathogens
Saliva contains digestive
juices which break down
pathogens.
Stomach
Skin
As a whole it acts as a
barrier to pathogens
Acid destroys
pathogens before
they can reach the
small intestine.
If it is damaged a scab
will form
Reproductive
Organs
Acidic conditions in
the vagina help to kill
pathogens.
What happens if microbes get past
the first line of defence?
Antibiotics
What do antibiotics do?
Antibiotics
Antibiotics only kill bacteria.
(they don’t work on viruses!)
They kill any bacteria; good and bad.
Antibiotic Resistance
http://www.brainpop.com/science/ecologyandb
ehavior/antibioticresistance/
Viruses
http://www.brainpop.com/health/diseasesinjuriesandconditions/viruses/
HIV
http://www.brainpop.com/health/diseasesinjuriesandconditions/aids/
Antibiotic Resistance
http://www.brainpop.com/science/ecologyandbehavior/antibioticresistance/
Avian flu
http://www.brainpop.com/health/diseasesinjuriesandconditions/avianflu/
Swine flu
http://www.brainpop.com/health/diseasesinjuriesandconditions/swineflu/
Protozoa
http://www.brainpop.com/science/diversityoflife/protozoa/
http://www.brainpop.com/science/diversityoflife/protists/
Microbes
http://www.bam.gov/sub_diseases/diseases_immuneplatoon_microbes.html
Immune system cartoon
http://www.bam.gov/sub_diseases/diseases_immuneplatoon.html
BACTERIA
http://www.brainpop.com/science/diversityoflife/bacteria/
http://www.pakistan.tv/videos-immuneresponse-[90hSVkaOG_w].cfm
http://www.brainpop.com/health/bodysystems/
immunesystem/
http://www.brainpop.com/health/personalhealt
h/boogers/