1 / 12

2 TYPES OF BACTERIA: Bacteria - Get food from an outside source

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

tender
Télécharger la présentation

2 TYPES OF BACTERIA: Bacteria - Get food from an outside source

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. 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

  2. 3 Shapes of Bacteria Bacteria are classified by shape into 3 groups: Spiral spirilla Rod-Shaped bacilli, bacillus Round cocci

  3. 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

  4. 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

  5. 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)

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

More Related