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THE FIVE KINGDOM
S
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Introduction to Bacteria
2 TYPES OF BACTERIA:
•Bacteria
-Get food from an outside source
•Blue-green Bacteria
-Make their own food
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BACTERIA
Bacteria - small one celled monerans
Bacteria like a warm, dark, and moist environment
They are found almost everywhere:
-water -air
-soil -food
-skin -inside the body
-on most objects
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Spiral:spirilla
rod-shaped: bacilli, bacillus
Round:cocci
3 Shapes of 3 Shapes of BacteriaBacteria
Bacteria are classified by shape into 3 groups:
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3 Shapes of 3 Shapes of BacteriaBacteria
Bacillus anthracis – (bacillus)
Neisseria meningitidis (coccus)
Leptospira interrogans – (spirilla)
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7 Major Structures of a Bacteria Cell
•Capsule
•Cell wall
•Ribosomes
•Nucleoid
•Flagella
•Pilli
•Cytoplasm
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•Binary Fission- the process of one organism dividing into two organisms
•Fission is a type of asexual reproduction
Reproduction of Reproduction of BacteriaBacteria
How?...The one main (circular) chromosome makes a copy of itselfThen it divides into two
•Asexual reproduction- reproduction of a living thing from only one parent
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BINARY FISSION
Bacteria dividing Completed
Reproduction of Reproduction of BacteriaBacteria
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•The time of reproduction depends on how desirable the conditions are
•Bacteria can rapidly reproduce themselves in warm, dark, and moist conditions
•Some can reproduce every 20 minutes
(one bacteria could be an ancestor to one million bacteria in six hours)
Reproduction of Reproduction of BacteriaBacteria
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Bacterial Cell & Nucleiod DNA Ring
DNA replication
Cell wall synthesis
Cell separation
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Bacteria Survival
Endospore- •a thick celled structure that forms inside the cell
•they are the major cause of food poisoning
•they can withstand boiling, freezing, and extremely dry conditions•it encloses all the nuclear materials and some cytoplasm
•allows the bacteria to survive for many years
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Bacillus subtilisEndospore-the black section in the middle
highly resistant structures
can withstand radiation, UV light, and boiling at 120oC for 15 minutes.
Bacteria Survival
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Bacteria Survival – Food sources
parasites – bacteria that feed on living things
saprophytes – use dead materials for food (exclusively)
decomposers – get food from breaking down dead matter into simple chemicals
important- because they send minerals and other materials back into the soil so other organisms can use them
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Harmful Bacteria • some bacteria cause diseases
•Animals can pass diseases to humans
Communicable Disease – Disease passed from one organism to another
This can happen in several ways:•Air•Touching clothing, food, silverware, or toothbrush•Drinking water that contains bacteria
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Human tooth with accumulation of bacterial plaque (smooth areas) and calcified tartar (rough areas)
Harmful Bacteria
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Helpful Bacteria•Decomposers help recycle nutrients into
the soil for other organisms to grow
•Bacteria grow in the stomach of a cow to break down grass and hay
•Most are used to make antibiotics
•Some bacteria help make insulin
•Used to make industrial chemicals
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E.coli on small intestines
Helpful Bacteria
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•Used to treat sewage
Organic waste is consumed by the bacteria, used as nutrients by the bacteria, and is no longer present to produce odors, sludge, pollution, or unsightly mess.
•foods like yogurt, cottage & Swiss cheese, sour cream, buttermilk are made from bacteria that grows in milk
Helpful Bacteria
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Controlling Bacteria3 ways to control
bacteria:1) Canning- the process of sealing food in airtight cans or jars after killing bacteria
•endospores are killed during this process
2) Pasteurization- process of heating milk to kill harmful bacteria
3) Dehydration- removing water from food•Bacteria can’t grow when H2O is
removed •example: uncooked noodles & cold cereal
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Controlling BacteriaAntiseptic vs. Disinfectants
Antiseptic- chemicals that kill bacteria on living things
•means – “against infection”
Examples: iodine, hydrogen peroxide, alcohol, soap, mouthwash
Disinfectants- stronger chemicals that destroy bacteria on objects or nonliving things
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Bacillus anthracis - rod, vegetative stage prokaryote (bacterium)Image Number: 21185A
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Neisseria meningitidis - coccus prokaryote (bacterium)Image Number: 97214E
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Leptospira interrogans - spiral shaped prokaryote (spirochete)
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Ecoli movement animatoin
http://www.hybridmedicalanimation.com/pages/jjani_qt/ecoli_qt.html
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http://www.google.ca/search?q=making+a+spore+print&hl=en&rls=com.microsoft:en-ca:IE-SearchBox&prmd=v&source=univ&tbs=vid:1&tbo=u&ei=lZDdTP7qMMienAe_3pXtDw&sa=X&oi=video_result_group&ct=title&resnum=2&ved=0CCcQqwQwAQ