Where can we find bacteria?
Lab Today
• Bacteria and fungi have been growing for 6
days
• We will look at what grew
• Make observations
• Reassess hypothesis
• Make conclusions
• Make health recommendations
Safety
• Keep the Petri dish closed
• Don’t open it or touch the samples
Observations
• What does it look like?
– Color
– Shape – circular, irregular?
– Texture – shiny, fuzzy?
• Make a drawing of what you see (use color)
and describe it in words
• Use microscope to get a closer look
Is it bacteria or mold (fungus)?
• Bacteria is typically white, cream ,or yellow
and fairly circular in shape
• Mold can be whitish gray with fuzzy edges or
different colors – usually turns a different
color in the center (like bulls-eye)
Is it bacteria or mold (fungus)?
Bacteria – Bacillus subtilis
Is it bacteria or mold (fungus)?
Green mold - Trichoderma harzianum
Is it bacteria or mold (fungus)?
Bacteria – Staphylococcus aures
What about yeast?
• Yeast looks similar to bacteria but is a fungus
• Candida albicans grows as white patches with glossy
surface
Make a creative Title page
• Give your booklet a title
• Make a drawing
Credits
• Title slide pictures from: http://www.norcalblogs.com/ and
http://biology.clc.uc.edu/Fankhauser/Labs/Microbiology/Coliform_assays/
Plates_with_Colonies/Ohio_River_0.2mL_MaC_P8011311.jpg
• Other pictures and information
from:http://www.sciencebuddies.org/science-fairprojects/project_ideas/MicroBio_Interpreting_Plates.shtml
• Picture of Bacteria booklets (Slide 10) by Katherine Pease – booklets made
by students in Brian Gabrich’s 7th grade classes at Emerson Middle School