Natural Sciences

Natural Sciences
Office & Location:
Parmer 326
Office Phone:
(708) 524-6972
Email: Personal Website:

Job Title

Department Chair, Professor - Chemistry


BA, Chemistry, Bethel College, St. Paul, Minn.
PhD, Organic Chemistry, University of Minnesota, Minneapolis

Awards & Grants

Undergraduate Research:

Chemical Constituents of St. John's Wort (Hypericum perforatum). David Kucher. Spring 2011
Dehydration of 3 and 4-Methyl-1-cyclohexanols: A study of reaction rates and product distributions. Nico Toritto. Spring 2011
Biorenewable Solvents for Countercurrent Chromatography. Natalie Thompson. Fall 2009/Spring 2010
Antioxidant Assays for the Analysis of Bottle Tea. Nicholas Lebbin Fall 2009/Spring 2010
Investigation of Lipid Extract Methods from Used Coffee Grounds. Nicholas Mahoney. Fall 2009/Spring 2010
Mechanistic Study of the Acid-catalyzed Dehydration of Methylcyclohexanols. Robert Schretzman. Fall 2008/Spring 2009
Biorenewable Solvents for Countercurrent Chromatography. Jason Dudeck & Peter Libreri. Fall 2008/Spring 2009
Analysis of Coffee Oil. Patrick Hughes. Spring 2009
Used Coffee Grounds: A New Source of Biofuel. Melanie Bonifacio. Fall 2007/Spring 2008
Investigating Solvent-Solvent and Solvent-Solute interactions with Reichardt’s Dye. Kendall Moore. Fall 2007/Spring 2008
Brine Shrimp Lethality Assay. Mike Zubick. Fall 2007/Spring 2008
Soxhlet Extraction of Used Coffee Grounds. Martin Gomez Fall 2006/Spring 2007

Recent Conference Presentations:

Countercurrent Chromatography into the Mainstream. Hangzhou, China. January 2011
OChemOnline: a Public Access Wiki to Extend Organic Chemistry Laboratories in Time and Space. Pedagogy Symposium Dominican University September 2010
Man in the Gap: my views on the relationship of science and spirituality. Caritas & Veritas Dominican University September 2010
The Use of Biorenewable Solvents in the Formulation of Countercurrent Separation Solvent Systems Countercurrent Chromatography Biannual Meeting Lyon, France July 2010
Unique Analytical Capabilities of Countercurrent Chromatography. 11th Annual NIH SBIR/STTR Conference (Small Business Innovation Research) Omaha, Nebraska July 2009


J. B. Friesen & R. Schretzman. "Dehydration of 2-Methyl-1-cyclohexanol: New Findings from a Popular Undergraduate Laboratory Experiment." Journal of Chemical Education, 88, 1141-1147 (2011).

S. N. Chen, J. B. Friesen, D. Webster, D. Nikolic, R. B. van Breemen, Z. J. Wang, H. H. Fong, N. R. Farnsworth, G. F. Pauli. "Phytoconstituents fromVitex agnus-castus fruits." Fitoterapia, 82, 528-533 (2011).

G.F. Pauli, J.B. Friesen,T. Gödecke, N.R. Farnsworth, B. Glodny. "Occurrence of Progesterone and Related Animal Steroids in Two Higher Plants." Journal of Natural Products, 73, 338-345 (2010).

J.B. Friesen, G.F. Pauli. "Binary Concepts and Standardization in Countercurrent Separation Technology." Journal of Chromatography A, 1216, 4237-4244 (2009).

J.B. Friesen, G.F. Pauli. "GUESSmix–guided Optimization of Elution–extrusion Counter–current Separations." Journal of Chromatography A, 1216, 4225-4251 (2009).



  • General Chemistry 
  • Natural Products Chemistry
Natural Sciences
Office & Location:
Parmer 243
Office Phone:
(708) 524-6913

Job Title

Department Chair; Assistant Professor - Biology


PhD, University of Texas at Austin
BS, University of Notre Dame


Guadagnoli JA, Braun AM, Roberts SP, and Reiber, CL (2005) "Environmental hypoxia influences hemoglobin subunit composition in the branchiopod crustacean Triops longicaudatus." The Journal of Experimental Biology 208: 3543-3551.

Braun AM and Thomas P. (2004) "Biochemical characterization of a membrane androgen receptor in the ovary of the Atlantic croaker (Micropogonias undulatus)." Biology of Reproduction 71: 146-155.

Braun AM and Thomas P. (2003) "Androgens inhibit estradiol-17B synthesis in Atlantic croaker (Micropogonias undulatus) ovaries by a nongenomic mechanism initiated at the cell surface." Biology of Reproduction 69: 1642-1650.

Hawkins MB, Thornton JW, Crews D, Skipper JD, Dotte (Braun) A, and Thomas P (2000). "Identification of a distinct estrogen receptor and reclassification of estrogen receptors in teleosts." Proceedings of the National Academy of Sciences 97:10751-10756.


  • Advanced Human Physiology
  • Comparative Animal Physiology
  • Animal Behavior
  • Elementary Microbiology for Nonmajors
  • Human Anatomy and Physiology I
  • General Biology II
  • Introductory Biology for Nonmajors
  • Marine Environmental Science