Introduction to Bacteria 2 types of bacteria

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

Helpful Bacteria

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) Dehydration- removing water from food

• Bacteria can’t grow when H2O is removed

• example: uncooked noodles & cold cereal