1 / 15

Ch. 19 – Importance of Bacteria!

Ch. 19 – Importance of Bacteria!. Used in food – yogurt, cheese, sauerkraut Decompose dead things E-coli in your stomach Sewage treatment Nitrogen fixation – convert nitrogen from air to a form that plants can use. Bacteria & Disease:. Examples of disease caused by bacteria:

shawnw
Download Presentation

Ch. 19 – Importance of Bacteria!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Ch. 19 – Importance of Bacteria!

  2. Used in food – yogurt, cheese, sauerkraut • Decompose dead things • E-coli in your stomach • Sewage treatment • Nitrogen fixation – convert nitrogen from air to a form that plants can use.

  3. Bacteria & Disease: • Examples of disease caused by bacteria: • Bubonic Plague – carried by fleas on rats. • “Ring around the Rosie Pocket full of posies Ashes, Ashes We all fall down”

  4. Escherichia coli (E-coli) • A whole family of bacteria, not all of which are harmful. • Good - Depend on E. coli in our intestines for Vitamin K and B • Bad - E-coli (0157:H7): symptoms: Bleeding, loss of water, kidney failure

  5. Some Terms to know: • Pathogens– viruses and bacteria that are disease producing agents • Virulence – the ability to cause disease

  6. 3 Steps to Disease • Contamination: pathogens are present… • Through air, food or water b. Direct contact (touch, body fluids, etc.) c. Contact with a carrier of a pathogen (tetanus [lockjaw] comes from bacteria found on soil particles)

  7. Tetanus - medical condition characterized by a prolonged contraction of skeletal muscle fibers

  8. 3 steps continued… • Infection – pathogens multiply in body • Disease – disturbance in the healthy body, so it can no longer carry out its normal functions.

  9. Bacteria cause disease in one of these 2 ways: • Break down cells to use as a food source. (Mycobacterium tuberculosis) • Release Toxins (E. coli) M. tuberculosis - destroys lung tissue; can enter blood stream & destroy other tissue.

  10. Coping with Disease: • Immunity – resistance to a pathogen that is acquired or inherited. • Antibodies – proteins that the body makes to destroy pathogens. • Antibiotics – drugs that attack and destroy bacteria. (before these, people died of things like strep throat!)

  11. Major Antibiotic: • Penicillin • Alexander Fleming 1928 discovered by accident in lab • A type of mold • Different types (amoxicillin, etc. come from different forms of the Penicillin fungi – mold)

  12. Controlling Bacteria: • Sterilization – heat of chemicals to kill bacteria • Bacteria cannot survive high temperatures for very long • Examples: Autoclave at the vet, dentist, doctors office, etc.

  13. Disinfectants – chemical solutions to reduce the number of bacteria • Examples: Antiseptics, Antibacterial products (soaps, cleansers, kitchen utensils)

  14. Controlling bacteria continued… • Soap – wash bacteria away; may be good enough • Food preservation – salt, vinegar, sugar, heat, low temperatures (refrigeration – doesn’t kill just slows growth!)

More Related