Dr. Duncan Mackenzie

Associate Professor

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Biography

Duncan MacKenzie is an Associate Professor Emeritus in the Department of Biology at Texas A&M University. He joined the faculty in 1983 and has focused his research on comparative endocrinology, specifically thyroid function and the mechanisms regulating hormone secretion in poikilothermic vertebrates. His laboratory examines how thyroid hormones influence fundamental physiological processes such as growth, nutrient utilization, and reproduction. He has discovered significant daily cycles of blood thyroxine levels in the red drum fish, suggesting a connection between the circadian rhythms and thyroid production. His current research explores the nutrient intake's effect on thyroid hormone secretion and the role of iodine transport in commercially important fish species. McKenzie's research spans a comparative perspective, including studies on reptiles and their thyroid hormone systems, aiming to enhance our understanding of the evolution of thyroid function. Through his research, he seeks to provide insights into the pituitary-thyroid axis, which could have implications for aquaculture production and endangered species conservation.

Research Interests

Requirements for Texas A&M University

Doctorate Program
Requirements
GPA Requirement
Required:3
GRE General
TOEFL
Total
Required:80
Prerequisites
Baccalaureate degree Baccalaureate degree in Communication or related field preferred
Application Checklist
  • Curriculum Vita
  • Statement of Purpose (500-750 words)
  • Writing Sample (up to 10,000 words)
  • Three Letters of Recommendation
  • Unofficial Transcripts
  • GraduateCAS Application
Specialization Notes

Department: Department of Communication and Journalism. Ph.D. program only currently admitting. GRE is test-optional.