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Books & Chapters| Manuscripts | Published Abstracts | Student Abstracts
Books and Book Chapters
Light, Douglas B. 2005. "Your Body: How it Works (The Senses)," Chelsea House Publ., Philadelphia, PA, in press.
Light, Douglas B. 2004. "Your Body: How it Works (Cells, Tissues, and Skin)," Chelsea House Publ., Philadelphia, PA, 154 pp.
Light, Douglas B. 1997. Study Guide to accompany Human Biology by Goodenough, Wallace, and McGuire, Saunders College Publishing, Philadelphia, PA, 523 pp.
Light, Douglas B. 1994. Teaching Testimonial on Enthusiasm in the Classroomū in Acting Lessons for Teachers: Using Performance Skills in the Classroom, R. Tauber and C. Mester (eds.). Praeger Publ., Westport, CT, 173 pp.
Light, Douglas B. 1991. "Ingestion" in Magill's Survey of Science: Life Science, F.N. Magill (ed.), Salem Press, Pasadena, CA, pp. 1414-1421.
Books & Chapters| Manuscripts | Published Abstracts | Student Abstracts
Refereed Publications
*Refers to undergraduate students who worked in my laboratory; funding provided by grants from the National Science Foundation and the Associated Colleges of the Midwest.
Light, D. B., A. J. Attwood*, and C. Siegel*. 2003. Calcium stimulates volume decrease in Necturus erythrocytes. J. Cell Science 116(1): 101-109.
Light, D. B., P. K. Dahlstrom*, R. T. Gronau*, and N. L. Baumann*. 2001. Extracellular ATP Activates a P2 Receptor in Necturus Erythrocytes During Hypotonic Swelling. J. Membrane Biol. 182: 193-202.
Light, D. B., T.L. Capes*, R. T. Gronau*, and M. R. Adler*. 1999. Extracellular ATP stimulates volume decrease in Necturus red blood cells. Am. J. Physiol. 277 (Cell Physiol. 46): C480-C491.
Light, D. B., M. R. Adler*, J. K. Ter Beest*, S. A. Botsford*, R. T. Gronau*. 1998. Protein kinase C and regulatory volume decease in mudpuppy red blood cells. J. Membrane Biol. 166: 119-132.
Light, D.B., T. M. Mertins*, J. A. Belongia*, and Carey A. Witt*. 1997. 5-Lipoxygenase metabolites of arachidonic acid stimulate potassium efflux during regulatory volume decrease by mudpuppy red blood cells. J. Membr. Biol. 158 (3): 229-239.
Bergeron, L.*, A. Stever*, and D. Light. 1996. Potassium conductance activated during regulatory volume decrease by mudpuppy red blood cells. Am. J. Physiol. 270 (Regulatory Integrative Comp. Physiol. 39): R801-R810.
Schwiebert, E.M., D.B. Light, G. Fejes-Toth, A. Naray-Fejes-Toth, and B.A. Stanton. 1990. A GTP-binding protein activates chloride channels in a renal epithelium. J. Biol. Chem. 265 (14): 7725-7728.
Light, D.B., J.D. Corbin, and B.A. Stanton. 1990. Dual ion-channel regulation by cyclic GMP and cyclic GMP-dependent protein kinase. Nature 344 (6264): 336-339.
Light, D.B., E.M. Schwiebert, G. Fejes-Toth, A. Naray-Fejes-Toth, K.H. Karlson, F.V. McCann, and B.A. Stanton. 1990. Chloride channels in the apical membrane of cortical collecting duct cells. Am. J. Physiol. 258 (Renal Fluid Electrolyte Physiol. 27): F273-F280.
Light, D.B., D.A. Ausiello, and B.A. Stanton. 1989. Guanine nucleotide-binding protein, alphai-3, directly activates a cation channel in rat renal inner medullary collecting duct cells. J. Clin. Invest. 84: 352-356.
Light, D.B., E.M. Schwiebert, K.H. Karlson, and B.A. Stanton. 1989. Atrial natriuretic peptide inhibits a cation channel in renal inner medullary collecting duct cells. Science 243: 383-385.
Light, D.B., F.V. McCann, T.M. Keller, and B.A. Stanton. 1988. Amiloride-sensitive cation channel in apical membrane of inner medullary collecting duct. Am. J. Physiol. 255 (Renal Fluid Electrolyte Physiol. 24): F278-F286.
Light, D.B., D.P. Van Eenenaam, R.L. Sorenson, and D.G. Levitt. 1987. Potassium-selective ion channels in a transformed insulin-secreting cell line. J. Memb. Biol. 95 (1): 63-72.
Books & Chapters| Manuscripts | Published Abstracts | Student Abstracts
Published Abstracts
*Refers to undergraduate students who worked in my laboratory; funding provided by grants from the National Science Foundation and the Associated Colleges of the Midwest.
Light, D., A. Spivak,* S. Pore,* C. Wormser,* and E. Helm.* 2007. Calcium and Regulated Volume Decrease in Atlantic Salmon and American Alligator Erythrocytes. FASEB J. 21(6): A964.
Light, D., C. Wormser,* E. Helm,* and L. Mason.* 2006. Regulated Volume Decrease in Atlantic Salmon and American Alligator Erythrocytes. The Physiologist 49(6): C30.5.
Light, D., Wormser, C.*, Pore, S.*, Silverman, L.*, and Spivak, A.* 2006. Regulated Volume Decrease in Alligator Erythrocytes. FASEB J. 20: A773.
S. A. Pore, L. N. Silverman, A. Spivak, and D. B. Light*. 2006. Regulated Volume Decrease in Alligator mississippiensis Erythrocytes. Integ. Compar. Biol. 45(6): 1179.
Light, D. B., Helm, E. M*, L. Z. Mason*, and J. L. Shelly*. 2005. Regulatory Volume Decrease in Salmo salar Erythrocytes. FASEB J. 19: 671.12
Light, D. B., Helm, E. M*, L. Z. Mason*, and J. L. Shelly*. 2005. Regulated Volume Decrease in Salmo salar Erythrocytes. Amer. Zool.
Light, D. B., and B. K. Campion*. 2003. Regulated volume decrease in Hyla chrysocelis erythrocytes. Amer. Zool. 42(6): 1267.
Light, D. B., A. J. Attwood*, and C. Siegel*. 2002. Calcium stimulates volume decrease in Necturus erythrocytes. FASEB J. 16(4): A55.
Attwood, A. J.*, C. Siegel*, and D. B. Light. 2002. Calcium stimulates volume decrease in Necturus erythrocytes. Amer. Zool. 41(6): 1382.
Light, D. B., P. K. Dahlstrom*, and N. L. Baumann*. 2001. Extracellular ATP stimulates volume decrease in Necturus erythrocytes via a P2X2 receptor. FASEB J. 15(4): A442.
Baumann, N. L.* and D. B. Light. 2001. Purinergic receptor activation with extracellular ATP leads to a calcium-sensitive volume decrease in Necturus erythrocytes. Amer. Zool. 40(6): 937.
Light, D. B., N. J. Evans*, C. M. Mazurzcak*, and E. E. Enk*. 2000. Leukotrienes D4 and E4 stimulate volume decrease in Necturus red blood cells. FASEB J. 14(4): A98.
Light, D. B. and R. T. Gronau*. 1999. A purinoceptor regulates volume decrease in mudpuppy red blood cells. FASEB J. 13(5): A715.
Light, D. B. and T. L. Capes*. 1999. Extracellular ATP stimulates volume decrease in mudpuppy red blood cells. FASEB J. 13(5): A715.
Adler, M. R.* and D. B. Light. 1999. Protein kinase C and regulatory volume decrease by Necturus red blood cells. Amer. Zool. 38(5): 123A.
Light, D. B. and J. K. Ter Beest*. 1998. Inhibition of protein kinase C reduces regulatory volume decrease by mudpuppy red blood cells. FASEB J. 12(5): A739.
Wiltzius, J. M.* and D. B. Light. 1998. Regulatory volume decrease by sheep red blood cells. Amer. Zool. 37(5): 143A.
Mertins, T. M.* and D. B. Light. 1997. 5-lipoxygenase metabolites of arachidonic acid stimulate a potassium conductance during regulatory volume decrease. FASEB J. 11(3): A516.
Witt, C. A.* and D. B. Light. 1997. Calmodulin stimulates a potassium conductance during regulatory volume decrease by activating phospholipase A2. FASEB J. 11(3): A516.
Ball, A. M.* and D. B. Light. 1996. Actin filaments are important for regulatory volume decrease by Necturus maculosus red blood cells. Amer. Zool. 36(5): 42A.
Belongia, J.* and D. Light. 1996. Potassium conductance regulated by eicosanoids during regulatory volume decrease. FASEB J. 10 (3): A87.
Light. D. and S. Botsford*. 1996. Role of protein kinase C and CAM-kinase in regulatory volume decrease. FASEB J. 10 (3): A86.
Smith, C. L.* and D. B. Light. 1995. Regulatory volume decrease by red blood cells of the freeze tolerant gray tree frog. Amer. Zool. 35 (5): 72A.
Light, D., A. Stever*, and L. Bergeron*. 1995. Calmodulin is necessary for regulatory volume decrease by Necturus maculosus erythrocytes. FASEB J. 9 (3):A355.
Light, D., L. Bergeron*, and A. Stever*. 1994. Regulatory volume decrease (RVD) by Necturus maculosus red blood cells. Physiologist 37 (5): A96.
Light, D., A. Stever*, and C. Camarato*. 1994. K+ channels are required for cell volume regulation by Necturus maculosus erythrocytes. FASEB J. 8 (4): A69.
Light, D. B. and Stever, A. J.* 1992. Cell volume regulation in hypotonic solutions by Necturus maculosus erythrocytes. Amer. Zool. 32 (5): 66A.
Stanton, B., D. Light, and J. Corbin. 1990. Dual regulation by cGMP and cGMP-dependent protein kinase of a renal amiloride-sensitive cation channel. FASEB J. 4 (3): A830.
Schwiebert, E., D. Light, P. Dietl, G. Fejes-Toth, A. Naray-Fejes-Toth, and B. Stanton. 1990. Protein kinase C and a GTP-binding protein, alphai-3, regulate a chloride channel in the cortical collecting duct. Kidney Int. 37: 199.
Stanton, B. A., D. A. Ausiello, and D. B. Light. 1990. The GTP-binding protein, alphai-3, regulates sodium absorption by the inner medullary collecting duct. Kidney Int. 37: 217.
Light, D., J. Corbin, and B. Stanton. 1990. Atrial natriuretic peptide (ANP) inhibits a cation channel in the inner medullary collecting duct (IMCD) by a cGMP-dependent protein kinase. Kidney Int. 37: 216.
Stanton, B. A. and D. B. Light. 1989. Atrial natriuretic peptide (ANP) inhibits sodium absorption by the renal inner medullary collecting duct: cellular mechanisms of action, 62nd Scientific Session of the American Heart Association.
Schwiebert, E. M., D. B. Light, and B. A. Stanton. 1989. A G protein, ai-3, regulates a chloride channel in renal cortical collecting duct cells. J. Gen. Physiol. 94: 6a.
Light, D. B., D. A. Ausiello, and B. A. Stanton. 1989. Gi gates a cation channel in renal inner medullary collecting duct cells. J. Gen. Physiol. 94: 31a.
Light, D. B., D. A. Ausiello, and B. A. Stanton. 1989. G protein regulation of a cation channel in renal epithelia. Biophys. J. 55 (2): 604a.
Light, D. B. and B. A. Stanton. 1989. G protein regulation of a cation channel. Twentieth Annual Winter Nephrology Meeting, Dartmouth Medical School.
Stanton, B., D. Ausiello, and D. Light. 1989. G protein regulation of a cation channel in inner medullary collecting duct (IMCD) cells. Kidney Int. 35: 483.
Light, D., E. Schwiebert, K. Karlson, and B. Stanton. 1989. Atrial natriuretic peptide and cGMP inhibit a renal cation channel. Kidney Int. 35: 165.
Light, D. B., E. M. Schwiebert, K. H. Karlson, and B. A. Stanton. 1988. Atrial natriuretic peptide and its second messenger cGMP inhibit a renal cation channel. Sixteenth New England Endocrine Conference, Dartmouth Medical School. (Received Presentation Award, postdoctoral category).
Light, D. B., K. H. Karlson, and B. A. Stanton. 1988. Atrial natriuretic peptide inhibits a cation channel in renal inner medullary collecting duct. J. Gen. Physiol. 92: 31a.
Light, D. B. and B. A. Stanton. 1988. Cyclic GMP-gated cation channel in apical membrane of rat inner medullary collecting duct (IMCD). FASEB J. 2 (4): A708. (Received the Caroline tum Suden Award).
Light, D., G. Fejes-Toth, A. Naray-Fejes-Toth, F. McCann, T. Keller, and B. Stanton. 1988. Voltage-dependent chloride channel in the apical membrane of intercalated cells in culture. Kidney Int. 33 (1): 442.
Light, D., F. McCann, T. Keller, and B. Stanton. 1987. Amiloride-sensitive cation channel in rat inner medullary collecting duct cells. J. Gen. Physiol. 90: 28a.
Light, D., F. McCann, T. Keller, G. Fejes-Toth, and B. Stanton. 1987. Ca2+-activated K+ channels in cultured intercalated cells. 17th Annual Winter Nephrology Meeting, Dartmouth Medical School.
Light, D., F. McCann, T. Keller, and B. Stanton. 1987. Electrophysiological characterization of rat inner medullary collecting duct (IMCD) by intracellular microelectrodes and patch clamping. Federation. Proc. 46 (6): 1392. (Received Award for Excellence in Renal Research).
Light, D. B., D. P. Van Eenenaam, R. L. Sorenson, and D. G. Levitt. 1986. Potassium channels and insulin secretion in a transformed beta-cell line. 15th Annual New England Physiologists Meeting. Tufts University School of Veterinary Medicine.
Light, D. B. and D. G. Levitt. 1986. K+-selective ion channels in HIT cells. Biophys. J. 49 (2): 166a.
Books & Chapters| Manuscripts | Published Abstracts | Student Abstracts
Abstracts Presented by Students Who Conducted Research in My Laboratory |
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*Refers to undergraduate students who worked in my laboratory; funding provided by grants from the National Science Foundation and the Associated Colleges of the Midwest.
Spivak, A.* and D.B. Light. 2006. Calcium and volume regulation in Alligator mississippiensis erythrocytes. Presented at the Seventeenth Annual Argonne Symposium for Undergraduate Students in Science.
Wormser, C.,* L. Mason,* E. Helm,* and D. Light. 2006. Regulatory volume decrease in Atlantic salmon and American alligator erythrocytes. Chicago Signal Transduction Symposium. Presented at Northwestern University.
Pore, S.,* L. Silverman,* and D. Light. 2006. Cell volume regulation in alligator red blood cellss. Chicago Signal Transduction Symposium. Presented at Northwestern University.
Wormser, C.* and D.B. Light. 2005. Calcium-dependent regulatory volume decrease in Salmo salar erythrocytes. Presented at the Sixteenth Annual Argonne Symposium for Undergraduate Students in Science.
Spivak, A.* and D.B. Light. 2005. Volume regulation in Alligator mississippiensis erythrocytes. Presented at the Sixteenth Annual Argonne Symposium for Undergraduate Students in Science.
Helm, E.M.* and D.B. Light. 2004. Hypotonic swelling increases intracellular calcium in salmon red blood cells. Fifteenth Annual Argonne Symposium for Undergraduate Students in Science.
Mason, L.Z.* and D.B. Light. 2004. Efflux of taurine leads to volume decrease in salmon erythrocytes. Fifteenth Annual Argonne Symposium for Undergraduate Students in Science.
Shelly, J.L.* and D.B. Light. 2004. Inhibition of phospholipase A2 blocks regulated volume decrease in salmon erythrocytes. Fifteenth Annual Argonne Symposium for Undergraduate Students in Science.
Light, D.B., N.L. Baumann*, and P.K. Dahlstrom*. 2004. P2 receptor activation leads to a calcium sensitive volume decrease in Necturus erythrocytes. 17th Chicago Signal Transduction Symposium. Presented at Northwestern University.
Campion, B. K.* and D. B. Light. 2002. Regulated volume decrease in Hyla chrysoscelis erythrocytes. Thirteenth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Siegel, C.* and D. B. Light. 2001. A rise in intracellular calcium stimulates volume decrease in Necturus erythrocytes. Twelfth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Attwood, A. J.* and D. B. Light. 2001. Cell swelling stimulates a rise in intracellular calcium in Necturus erythrocytes. Twelfth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Baumann, N. L.* and D. B. Light. 2000. Purinergic receptor activation with extracellular ATP leads to a calcium-sensitive volume decrease in Necturus erythrocytes. Eleventh Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Dahlstrom, P. K.* and D. B. Light. 2000. Extracellular ATP stimulates volume decrease in Necturus erythrocytes via a P2X2 receptor. Eleventh Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Enk, E. E.* and D. B. Light. 1999. Taurine and cell volume regulation in Necturus maculosus red blood cells. Tenth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Evans, N. J.* and D. B. Light. 1999. Leukotrienes D4 and E4 stimulate volume decrease in Necturus red blood cells. Tenth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Mazurczak, C. M.* and D. B. Light. 1999. Calcium stimulates regulatory volume decrease in Necturus red blood cells. Tenth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Adler, M. R.* and D .B. Light. 1999. Protein kinase C and cell volume regulation in mudpuppy red blood cells. Conference Proceeding of the Wisconsin Academy of Sciences, Arts, and Letters. Presented at the annual symposium in Stevens Point, WI.
Capes, T. L.* and D. B. Light. 1999. Extracellular ATP stimulates cell volume regulation in mudpuppy red blood cells. Conference Proceeding of the Wisconsin Academy of Sciences, Arts, and Letters. Presented at the annual symposium in Stevens Point, WI.
Gronau, R. T.* and D. B. Light. 1999. A purinoceptor regulates cell volume in mudpuppy red blood cells. Conference Proceeding of the Wisconsin Academy of Sciences, Arts, and Letters. Presented at the annual symposium in Stevens Point, WI.
Capes, T. L.* and D. B. Light. 1998. Extracellular ATP stimulates cell volume regulation in mudpuppy red blood cells. Ninth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Adler, M .R.* and D. B. Light. 1998. Protein kinase C and cell volume regulation in mudpuppy red blood cells. Ninth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Gronau, R. T.* and D. B. Light. 1998. A purinoceptor regulates cell volume in mudpuppy red blood cells. Ninth Annual Argonne Symposium for Undergraduate Students in Science. Presented at Argonne National Laboratory.
Wiltzius, J. M.* and D. B. Light. 1998. Calcium and arachidonic acid stimulate regulatory volume decrease by sheep red blood cells. Conference Proceeding of the Wisconsin Academy of Sciences, Arts, and Letters. Presented at the annual symposium in De Pere, WI.
Smith, E. L.*, Stevens, M. E., and D. B. Light. 1998. The effects of cytochalasin B on the cytoskeleton of mudpuppy erythrocytes. Conference Proceeding of the Wisconsin Academy of Sciences, Arts, and Letters. Presented at the annual symposium in De Pere, WI.
Wiltzius, J. M.* and D. B. Light. 1997. Calcium and Arachidonic Acid Stimulate Regulatory Volume Decrease in Sheep Red Blood Cells. Eighth Annual Argonne Symposium Undergraduate Students in Science. Presented at Argonne National Laboratory.
Ter Beest, J.* and D. B. Light. 1997. Inhibition of Protein Kinase C Reduces Regulatory Volume Decrease by Mudpuppy Red Blood Cells. Eighth Annual Argonne Symposium Undergraduate Students in Science. Presented at Argonne National Laboratory.
Mertins, T. M.* and D. B. Light. 1997. 5-Lipoxygenase Metabolites of Arachidonic Acid Regulate a K+ Conductance during Regulatory Volume Decrease. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Whitewater, WI.
Witt, C. A.* and D. B. Light. 1997. Calmodulin Activation of Phospholipase A2 and Subsequent K+ Efflux during Regulatory Volume Decrease. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Whitewater, WI.
Huizenga, C. J.*, D. B. Light, and R. L. Wallace. 1997. Bactericidal Effects of Antibacterial Soaps on Common Bacteria. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Whitewater, WI.
Witt, C. A.* and D. B. Light.1996. Calmodulin activation of phospholipase A2 and K+ efflux during regulatory volume decrease by mudpuppy red blood cells. Seventh Annual Argonne Symposium Undergraduate Students in Science. Presented at Argonne National Laboratory.
Mertins, T. M.* and D. B. Light. 1996. 5-lipoxygenase metabolites of arachidonic acid regulate a K+ conductance during regulatory volume decrease by mudpuppy red blood cells. Seventh Annual Argonne Symposium Undergraduate Students in Science. Presented at Argonne National Laboratory.
Belongia, J.* and D. Light. 1996. A leukotriene is necessary for regulatory volume decrease by mud puppy red blood cells. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Stevens Point, WI.
Botsford, S.* and D. Light. 1996. Calmodulin is necessary for regulatory volume decrease by mudpuppy red blood cells. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Stevens Point, WI.
Smith, C.* and D. Light. 1996. Regulatory volume decrease by red blood cells from the freeze tolerant gray tree frog, Hyla versicolor. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Stevens Point, WI.
Smith, C. L.* and D. Light .1995. Cell volume regulation by red blood cells of the freeze tolerant gray tree frog. Presented at the ACM Program for Minority Students, Beloit College, Beloit, WI.
Bauer, C.* and D. Light. 1995. Freeze resistance as an overwintering adaptation for the mealworm, Tenebrio molitor. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Madison, WI.
Bergeron, L.* and D. Light. 1995. Cell volume regulation by mudpuppy red blood cells. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Madison, WI.
Camarato, C.* and D. Light. 1994. Potassium and calcium channels are required for cell volume regulation by Necturus maculosus red blood cells. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Waukesha, WI.
Stever, A. J.* and D. B. Light. 1992. Cell volume regulation by Necturus maculosus red blood cells in hypotonic saline solutions. Associated Colleges of the Midwest Program for Minority Students and Academic Careers. Presented at the annual symposium in Appleton, WI.
Polk, R.* and D. Light. 1992. Effect of light wavelength on pigment distribution in crayfish. Conference Proceedings of the Wisconsin Academy of Sciences, Arts, and Letters. Presented at the annual symposium at the Univ. of Wisconsin, Eau Claire, WI.
Munar, M.* and D. Light. 1992. Cell volume regulation in red blood cells exposed to hypotonic solutions. Conference Proceedings of the Wisconsin Academy of Sciences, Arts and Letters. Presented at the annual symposium in Eau Claire, WI.
Sangkhammee, P.* and D. Light. 1991. The role of size and antioxidant vitamins in the mortality of paramecia exposed to ultraviolet light. Presented at the ACM Program for Minority Students, Lake Forest College, Lake Forest, IL.
Kinard, T.* and D. Light. 1990. Regulatory mechanisms of myogenic hearts. Conference Proceedings of the Wisconsin Academy of Sciences, Arts, and Letters. Abstract presented at the annual symposium at the Univ. of Wisconsin, Platteville, WI.