1. Biodiversity (Bacteria-Algae-Fungi)
USDA NIFSI Food Safety in the Classroom©
University of Tennessee, Knoxville 2006

2. What are bacteria? Single celled organisms Very small
E. Coli O157:H7 can make you very sick.
What are bacteria?
Single celled organisms
Very small
Need a microscope to see
Can be found on most materials and surfaces
Billions on and in your
body right now
Streptococcus can cause strep throat.
This E. coli helps you digest food.
USDA NIFSI Food Safety in the Classroom©
University of Tennessee, Knoxville 2006

3. Gram staining (or Gram's method) is a method of differentiating bacterial species into two large groups (gram-positive and gram-negative). The name comes from its inventor, Hans Christian Gram.

5. What do they look like? Three basic shapes
Rod shaped called bacilli (buh-sill-eye)
Round shaped called cocci (cox-eye)
Spiral shaped
Some exist as single cells, others
cluster together
Bacilli
Cocci
Spiral
USDA NIFSI Food Safety in the Classroom©
University of Tennessee, Knoxville 2006

6. coccus singular Cocci (plural) 3-Tetrads shape Name spherical
1-Diplo cocci
Cocci (plural)
2-Strepto cocci
3-Tetrads
4-staphylo cocci

7. staphylococci
Diplococci
Streptococci
Streptococci

8. Bacilli (plural) Bacillus (Singular) 1-Diplo bacilli 2-Strepto bacilli
Rodshape
Bacillus (Singular)
1-Diplo bacilli
Bacilli (plural)
2-Strepto bacilli
Single bacillus
Diplobacilli
streptobacilli

9. Bacilli
Cocci

10. pesha
Name
spiral
Vibrio comma ---- chlorera