September 16, 1999	David McConkey, Ph.D., Associate Professor Department of Cancer Biology University of Texas M. D. Anderson Cancer Center Houston, TX
Title:	Protease activation in thymocyte apoptosis.
September 23, 1999	Donald Molony, M.D., Associate Professor Department of Internal Medicine - Renal Diseases and Hypertension University of Texas Houston Health Science Center Houston, TX
Title:	Nephrotoxicity of environmental pesticides.
September 30, 1999	Marvin Meistrich, Ph.D., Ashbel Smith Professor of Experimental Radiation Oncology Department of Experimental Radiotherapy University of Texas M. D. Anderson Cancer Center Houston, TX
Title:	Reversal of toxicant-induced spermatogonial arrest by suppression of testosterone.
October 7, 1999	Honnavara N. Ananthaswamy, Ph.D., Professor and Chairman ad Interim Department of Immunology University of Texas M. D. Anderson Cancer Center Houston, TX
Title:	Mechanisms in psoralen and UVA-induced cell death and skin cancer.
October 14, 1999	Laurie Owen-Schaub, Ph.D., Associate Professor Department of Immunology University of Texas M. D. Anderson Cancer Center Houston, TX
Title:	Fas and fas ligand: Sensors of DNA damage critical for ultraviolet-induced tumor formation and progression.
October 21, 1999	Willem J. S. de Villiers, M.D., Ph.D., Assistant Professor Department of Internal Medicine - Gastroenterology University of Kentucky Medical Center Lexington, KY
Title:	Macrophage scavenger receptors and foam cell formation.
October 28, 1999	Manjeri A. Venkatachalam, M.B, B.S, Professor of Pathology and Medicine Department of Pathology University of Texas Health Science Center at San Antonio San Antonio, TX
Title:	Non-apoptotic and apoptotic mechanisms of hypoxic cell death.
November 4, 1999	Ronald B. Tjalkens, Ph.D., Research Associate Department of Environmental Health Sciences - Toxicology University of Michigan Medical Center Ann Arbor, MI
Title:	Role of the mitochondrial permeability transition in neurotoxicity.
November 11, 1999	Paul Foster, Ph.D., Program Director Endocrine, Reproductive and Developmental Toxicology Chemical Industry Institute of Toxicology Research Triangle Park, NC, (Hosted by Marvin Meistrich, Ph.D.)
Title:	The endocrine disrupting effects of phthalate esters on male reproductive development: or, You're not half the man your father was!
Tuesday November 30, 1999 MSB 3.001	Ken Olden, Ph.D., Director National Institute of Environmental Health Sciences National Institutes of Health Research Triangle Park, NC (Hosted by Lovell Jones, Ph.D.)
Title:	Improving public health through environmental health research.