Plants & Human Affairs - Introduction
Cherries.wmf (7140 bytes) Plants & Human Affairs (BIOL106)  -  Stephen G. Saupe, Ph.D.; Biology Department, College of St. Benedict/St. John's University, Collegeville, MN 56321;;

Screening for Biodynamic Plants

Pre-Lab #1:

  1. Print and read the Bioassay experiment

  2. Read Herbarium and Collecting Techniques

  3. Type answers to the following questions:

  • What is an herbarium?

  • What is a voucher specimen?


  1. Prepare a herbarium label for your plant specimen. Put the label in the newsprint with your specimen.

  2. Prepare a typed report about the plant that includes, at a minimum, the following information.  Some potential references are provided below.

  • common name(s)

  • scientific name

  • family name

  • brief description of plant (append an image of plant)

  • indication of where plant grows

  • to where is the plant native?

  • which parts of plant, if any, have been used for medicine?

  • how has the plant been prepared for medicine?

  • who, if anyone, has used this plant and for what treatments?

  • chemistry of plant; identify any known chemicals/active ingredients in plant

  • other miscellaneous

Pre-Lab #2:

Post-Lab #2:

  1. Complete, on separate sheets of paper, tables 1, 2, 3, 4, and 5.

  2. Plot  % died (corrected) vs. log extract conc (μg mL-1).

  3. Determine the LD50 from the graph. (show your work)

  4. Prepare a written report documenting this experiment.  Your report should, at a minimum, summarize your results of your bioassay and indicate whether it matched with your expected (hypothesized) results?  Why or why not?  Explain. (1 page max; typed)

Internet Resources:

References: (here's a small sampling)


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Last updated:  09/10/2007 � Copyright  by SG Saupe