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2 TYPES OF BACTERIA: Bacteria - Get food from an outside source Cyanobacteria - Make their own food Bacteria - small one celled monerans Bacteria like a warm, dark, and moist environment They are found almost everywhere: -water -air -soil -food

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Presentation Transcript
slide1

2 TYPES OF BACTERIA:

  • Bacteria- Get food from an outside source
  • Cyanobacteria- Make their own food
  • 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
slide2

3 Shapes of Bacteria

Bacteria are classified by shape into 3 groups:

Spiral

spirilla

Rod-Shaped bacilli, bacillus

Round

cocci

slide3

Bacillus anthracis – (bacillus) – causes the disease anthrax in livestock (cows)

Neisseriameningitidis (coccus) – causes meningitis, a life threatening disease where the brain becomes inflammed

Leptospirainterrogans – (spirilla)

3 Shapes of Bacteria

slide4

Reproduction of Bacteria

  • Binary Fission-the process of one organism dividing into two organisms
  • Fission is a type of asexual reproduction
  • Asexual reproduction-reproduction of a living thing from only one parent
slide5

Reproduction of Bacteria

  • The time of reproduction depends on how desirable the conditionsare
  • Bacteria can rapidly reproduce themselves in warm, dark, and moist conditions
  • Some can reproduce every 20minutes
        • (one bacteria could be an ancestor to one million bacteria in six hours)
slide6

Bacteria Survival

Endospore -

a thick celled structure that forms inside

the cell

  • they are the major cause of food poisoning
  • allows the bacteria to survive for many years
  • they can withstand boiling, freezing, and extremely dry conditions
  • it encloses all the nuclear materials
  • and some cytoplasm
slide7

Controlling Bacteria

3 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) Dehydrating-removing water from food

* Bacteria can’t grow when H2O is removed

example: uncooked noodles & cold cereal

slide8

Harmful Bacteria

  • Pathogenic bacteria– bacteria which cause disease. Enter a body and take nutrients from the host or produce toxins
    • - Lyme disease - cholera
    • - bubonic plague - Tuberculosis
    • - salmonella
  • Communicable Disease – Disease passed from one organism to another
slide9

Helpful Bacteria

  • Decomposershelp recycle nutrients into the soil for other organisms to grow
  • Bacteria grow in the stomach of a cow to break down grass and hay
  • Many are used to make
  • antibioticsthat can treat
  • bacterial diseases
  • Some bacteria help make insulinthat help people with diabetes
  • Used to make industrial chemicals
slide10

Helpful Bacteria

  • 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
slide11

Controlling Bacteria

Antiseptic 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

slide12

BLUE-GREEN BACTERIA

  • can be toxicto humans and animals

Blooms- occur when the bacteria multiplies in great numbers and form scum on the top of the water