zika

The Zika Threat

ASM Acts to Counter Zika Virus Outbreak.
Read

The Zika Diaries

Follow Dr. Vincent Racaniello’s lab as they work on Zika
at his Columbia University lab.
Read

Read a Book Chapter about Zika Virus

Werner Slenczka presents an overview of Zika Virus in the book Emerging Infections 10, just published by ASM Press.
Read
Become a member today!
JOIN ASM
Submit to an ASM Journal
SUBMIT
Register for the Beneficial Microbes Conference
REGISTER

Abstract


In this experiment, serial dilution of a contaminated water source is examined for turbidity and bacterial cell count. Because chemical and microbial contaminations are not always visible to the naked eye, the microbial presence will be brought to the attention of the learner by use of viable plate counts.


Intended Audience

Grades 9-12

Learning Objectives

At the completion of this activity the learner will be able to successfully perform serial dilutions as well as be able to calculate the corresponding concentration of the dilutions. The student will also have knowledge of how to conduct a bacterial cell count and thus bacterial concentrations.


Necessary Student Background

Students should be equipped with the skill set and knowledge of using transfer pipettes and compound light microscope (if you choose to use one). They should also be able to use mathematical concepts to prepare dilutions.


Keywords

Contamination, Serial Dilution, Turbidity, Microorganism Bacterial, Cell Count

Print a PDF of this activity

Is It Clean or Just Unseen? Dirty Water and the Naked Eye (12 pages)

TPL_asm2013_SEARCH

8200