Transcript BACTERIA - 18-202

 STAY CLEAN 
Kaltham Al-Kuwari
Science
7D
 BACTERIA 
Bacteria are tiny living beings (microorganisms) they are neither plants nor animals - they belong
to a group all by themselves. Bacteria are tiny
single-cell microorganisms, usually a few
micrometers in length that normally exist
together in millions.
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Bacteria can be found in:
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Soil
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Radioactive waste
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Water
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Plants
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Animals
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Deep in the earth's crust
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Organic material
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Arctic ice
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Glaciers
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Hot springs
The stratosphere (between 6 to 30 miles up in the
atmosphere)
Ocean depths - they have been found deep in ocean
canyons and trenches over 32,800 feet (10,000
meters) deep.
They live in total darkness by thermal vents at incredible
pressure. They make their own food by oxidizing
sulfur that oozes from deep inside the earth.
 CONDITIONS BACTERIA GROW IN 
Bacteria are everywhere. Most bacteria are useful like those
used in the production of yogurt, cheese and sourdough
bread, but some are very harmful. These harmful bacteria
are called pathogenic bacteria; that is they make people
sick. Although, they can be found in:
• Food
• Acidity
• Temperature
• Time
• Oxygen
• Moisture
 VIRUSES 
Viruses are too small to be seen by the naked eye. They can't multiply
on their own, so they have to invade a 'host' cell and take over it in
order to be able to make more virus particles.
Infections with viruses and bacteria spread by:
• A person with a cold can spread the infection by coughing and/or
sneezing.
• Touching or shaking hands with another person.
• Touching food with dirty hands will also allow viruses or bacteria
from the intestine to spread.
• Body fluids, such a blood, saliva and semen, can contain the
infecting organisms of such fluids, for example by injection or
sexual contact.
 UNDER THE MICROSCOPE 
 AVOID VIRUSES AND
BACTERIA 
• Wash your hands thoroughly (often one of the best
ways to avoid catching a cold).
• Shaking hands with someone who has a cold is risky, so
avoid rubbing your eyes or nose afterwards.
• Food should be cooked or cooled down as quickly as
possible.
• Vegetables and meat must be stored separately and
prepared on separate chopping boards.
• Meat should preferably be served well-done.
• Remember that food with these invisible organisms
does not necessarily smell bad.
 BIBLIOGRAPHY 
http://www.preparednesspro.com/wp-content/uploads/2011/02/SafetecHandSanitizer-photo-co-westernsafetycom.jpg
http://www.medicalnewstoday.com/articles/157973.php
http://www.bevpease.force9.co.uk/p.Bacteria_files/image002.gif
http://www.bbq-brethren.com/forum/archive/index.php/t-17929.html
http://blog.hailmerry.com/wp-content/uploads/2012/10/Bacteria.jpg
http://www.netdoctor.co.uk/health_advice/facts/virusbacteria.htm
http://cdn.medgadget.com/img/76546bac.jpg
http://www.foxnews.com/images/339466/4_61_bacteria_e_coli.jpg
http://i.istockimg.com/file_thumbview_approve/3731224/2/stock-photo-3731224-bacteria-under-microscope.jpg
http://www.bacteriamicroscopes.com/images/bacteria1.jpg
http://weboflife.nasa.gov/images/blustein3.jpg