AMR Sept Banner v2

ASM Attends UN General Assembly

ASM President, Susan Sharp, Ph.D., joined global leaders at the United Nations General Assembly in New York today in a historical meeting to focus on the commitment to fight AMR.
Read

UN General Assembly Focuses on AMR

Leaders at the UN General Assembly draft a plan for coordinated, cross-cutting efforts to improve the current state of AMR.
Read

Superbugs are a 'Fundamental Threat'

If antibiotics were telephones, we would still be calling each other using clunky rotary dials and copper lines," Stefano Bertuzzi, CEO of ASM, told NBC News.
Read
Become a member today!
JOIN ASM
Submit Abstracts for Biothreats 2017
SUBMIT
Antibacterial Development Conference
REGISTER

Abstract
The lab exercise assumes basic knowledge of prokaryotes (structure, function, metabolism, and respiration) and the functions and limitations of enzymes. Building upon this knowledge and using guided prompts, students brainstorm how to create an agar on which only coliform bacteria will grow and how to differentiate between Escherichia coli and other coliforms based on their enzymes. Finally, students filter surface water and place it on media that differentiates E. coli from other coliforms using an enzyme unique to E. coli. The resulting data are used to determine if the water meets the Minnesota state standards for safe swimming or drinking water.

Intended Audience
Grades 9-12

Learning Objectives
At the completion of this activity, each learner will be able to:
     1. Students will utilize the unique enzymatic properties of bacteria to brainstorm a design for agar media that   will allow for the quantification of E. coli and coliform bacteria.
     2. Students will differentiate and enumerate colonies of E. coli and coliforms on agar media.
     3. Students will interpret water quality standards for freshwater in terms of numbers of colonies of E. coli allowed per sample of water.

Necessary Student Background
Students should have a strong basic knowledge of prokaryotic cells, enzymes and water quality before beginning this activity. These topics are also reviewed in the student handouts included with this activity.

Keywords
Bacteria, E. coli, Coliform, Environmental sample, Lactose, Water quality, Enzyme, Petri dish, Filtration, Catalyst, Bioremediation

Print a PDF of this activity
Quantification of Escherichia coli Contamination in Water (19 pages)

 

TPL_asm2013_SEARCH

8162