1987 - 1993 Seasonal control of reproduction in the marsh rice rat Oryzomys palustris.

• Characterization of the reproductive cycle under field conditions
• Role of photoperiod on gonadal status in adults and on gonadal development in juveniles
• Role of the pineal gland and the effects of melatonin administration using implants, injections, and infusions on gonadal status
• Examination of pineal melatonin profiles under different photoperiods
• Effects of age, temperature, and food availability on reproduction

1993 - 1994 Regulation of circadian body temperature rhythms in the Japanese quail, Coturnix coturnix japonica.

• Role of the pineal gland, eyes, and ovaries
• Multioscillator nature of the circadian system
• Effects of melatonin administration

1995 - 1997 Photoperiodic Control of Neuroendocrine Function.

• Colocalization of melatonin receptors and various neuropeptides and steroid receptors in hamster and sheep brain and pars tuberalis using in situ hybridization and immunocytochemistry
• Melatonin regulated gene expression in sheep pars tuberalis using differential display

1997 - Present Seasonal control of reproduction in the marsh rice rat Oryzomys palustris.

• Effects of photoperiod, melatonin, the pineal gland, food availability, thyroid hormones, reproductive hormones, ethanol, and Vitamin D3 on compensatory gonadal hypertrophy in the marsh rice rat (Oryzomys palustris)
• Pharmacological regulation of melatonin secretion
• Effects of age on melatonin secretion
• Effects of nutrition on reproduction
• Effects of melatonin and auxin on plant development in Arabidopsis thaliana and of auxin on animal reproductive development in Oryzomys palustris
• Regulation of gastrointestinal development by photoperiod, melatonin, food restriction, and ethanol