Integrated Science Day 8 - PowerPoint PPT Presentation

1 / 13
About This Presentation
Title:

Integrated Science Day 8

Description:

Using Bioassays for Environmental Research * An Introduction ... Using Bioassays for Environmental Research * Using Bioassays for Environmental Research Toxicology ... – PowerPoint PPT presentation

Number of Views:198
Avg rating:3.0/5.0
Slides: 14
Provided by: pai125
Category:

less

Transcript and Presenter's Notes

Title: Integrated Science Day 8


1
Integrated Science Day 8
  • September 24, 2012

2
Learning targets
  1. I can evaluate a laboratory procedure and analyze
    the data to form a conclusion
  2. I can Set up an Inquiry lab by coming up with an
    investigative question and determining my needs
    for the lab.

3
Agenda
  • Kick off question
  • What ideas do you have for your science fair
    project?
  • Heart rate lab conclusion should be turned in for
    a grade
  • Daphnia Lab conclusion turned in today
  • Set up for the effect of substances on organisms
    in our waterways
  • Learning log What is a bioassay?

4
Water Contamination
  • How do we know what is clean water? In other
    words, how do we know if water is safe for
    humans and wildlife?

5
Bioassays- notes
  • Dose/Response Bioassays are used to
  • Estimate toxicity to humans.
  • Estimate maximum concentrations of specific
    chemicals allowed to discharge into bodies of
    water.
  • Investigate hazardous waste sites.

6
Bioassay
  • A bioassay involves the use of biological
    organism to test for chemical toxicity.

Canaries are used by coal miners as a way to test
for high levels of methane (an odorless gas)
7
Bioassay Species
  • 3 organisms are often used
  • Daphnia
  • Duckweed
  • Lettuce Seeds
  • Expose organisms to chemicals and measure how
    they respond.

7
8
Used by the FDA
  • Bioassays are used to test drugs and skin care
    products before being okayed by the FDA.

9
Daphnia
10
CONCENTRATION VS. DOSE
  • LD50 the Dose that is Lethal for 50 of the test
    organisms.
  • Used for Daphnia
  • TC50 the Concentration that causes a 50 drop in
    growth or health of the test organisms (Toxic
    Concentration).
  • Used for seeds (they may not die, just not
    sprout)

11
An Introduction To Experimental Design
  • The Treatments in an experiment represent the
    factor that you vary while keeping everything
    else constant.

12
An Introduction To Experimental Design
  • The control is the untreated group, used for
    comparison with the treatment groups.

13
An Introduction To Experimental Design
  • Replicates are groups of organisms exposed to
    identical conditions.
  • The more replicates the better.
Write a Comment
User Comments (0)
About PowerShow.com