Transcript Lesson 1.2 - Cornell University

Lesson 1.2
Suspect Profiling
Definitions and templates for:
Case Notes 1.2 l Investigation Activity 1.2
Viral Types
Penicillium spp.
Escherichia coli O157:H7
Saccharomyces cerevisiae
Definition
Bacteria
• Single-cell microorganism with no clearly
defined nucleus (prokaryote), capable of
self-replication.
• Bacteria usually reproduce by one cell
splitting in two.
• With ideal conditions
they split every half
hour. In 12 hours one
cell could multiply into
33 million cells!
Definition
Bacteria
• Bacteria can use most
carbohydrates, fats, and proteins as
sources of nutrients.
• Because of this you can find them
nearly everywhere
• In air, soil, and water
• In intestines of animals
and humans
• On raw meat, poultry,
and seafood
Definition
Bacteria can also be on
• Skins of fruits and vegetables
• Shells of nuts
• Insects and rodents
• Hand, skin, hair, and clothing of
people
Definition
Bacteria
Some bacteria have the ability to form
seed like structures that allows them to
survive for longer periods of time under
inhospitable conditions. This form is
called a spore.
Definition
Virus
• A piece of nucleic acid (DNA or RNA)
surrounded by a protein membrane.
• A virus cannot reproduce on its own.
It must infect the cell of another living
organism before it can
replicate.
Definition
Fungi
A kingdom of organisms that include
mushrooms, molds, and yeasts.
Definition
Two types of fungi commonly
associated with food microbiology are
• Mold
• Yeast
Saccharomyces cerevisiae
Penicillium spp.
Definition
Mold
• Multi-cellular, filamentous fungi that
grow very quickly by asexual
reproduction.
• Need little water.
• Do need the right temperature and level
of oxygen to grow.
• Prefer room or higher temperatures.
Definition
Yeast
• Unicellular fungi that usually go through
cell division by budding.
• Although they are unicellular (single cell)
organisms, yeasts commonly grow
together in groups to break down sugar
and starches.
• Yeasts require moist or wet
environments.
Definition
Parasite
An organism that lives on or in another
organism often at the expense of the host
organism.
Pigs eating raw garbage
Raw or inadequate
cooking
Giardia on intestinal
wall (Image by S. Wade)
Suspect Profiling
Case Notes 1.2
Name:_____________________________ Date:___________________________
Why is Criminal Profiling used in investigations? ______________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Microorganism
1.
2.
3.
3a.
3b.
4.
Definition
Case Notes
1.2
Suspect Profiling
Investigation Activity 1.2
Name: ____________________________ Date: ___________________________
When investigators profile likely suspects they look at large segments of the population and collect
data on the backgrounds, characteristics, behaviors, and traits of various types of suspects.
Directions: Use the material provided, including the booklet accompanying the prepared slides, to
create a profile for each category of likely suspects in our FSI foodborne illness outbreak
investigation.
First – Sketch what you see under the microscope on each slide (Note: for virus use the PPT 1.2
image).
Second – Using the references provided, label your sketch with the structures of the organisms and
describe 2-3 of the defining characteristics in the column on the right.
Suspect Category 1
Bacteria
List 2-3 Characteristics
Suspect Category 2
Viruses
List 2-3 Characteristics
Investigation
Activity
1.2
Suspect Category 3
Parasites
List 2-3 Characteristics
Suspect Category 4
Yeasts
List 2-3 Characteristics
Suspect Category 5
Molds
List 2-3 Characteristics
Investigation
Activity
1.2 (cont.)
Escherichia coli O157:H7
Viral Types
Giardia lamblia
Penicillium spp.
Scanning Electron Micrograph of
Saccharomyces cerevisiae
National GAPs Program © 2007
Department of Food Science
Department of Education
Cornell University
Ithaca, NY 14853
www.gaps.cornell.edu