On May 8, 2025, Professor Alexander P. Demchenko delivered a lecture titled "Molecular Machines: Unidirectional Translocation of Ions powered by Light" at the Department of Medicinal and Applied Chemistry, College of Life Sciences, Kaohsiung Medical University. In his talk, Professor Demchenko shared groundbreaking insights into the design and operation of molecular machines that utilize light energy to drive unidirectional ion transport, fascinating students, faculty, and researchers with interests in supramolecular chemistry, nanotechnology, and biomimetic systems.

Professor Demchenko is internationally recognized for his contributions to fluorescence spectroscopy as well as molecular and membrane biophysics. He has authored more than 200 scientific publications and two influential monographs: Ultraviolet spectroscopy of proteins (Springer-Verlag, 1986) and Introduction to Fluorescence Sensing (Springer-Nature, 3-nd ed, Vol. 1, 2020; Vol. 2, 2023). He also serves on the editorial boards of several prestigious scientific journals.

Professor Demchenko earned his PhD in biophysics from the Institute of Biochemistry of the Ukrainian Academy of Sciences in 1982. Throughout his distinguished career at the Palladin Institute of Biochemistry in Ukraine, he has been invited as a visiting professor to institutions across the United States, Germany, Turkey, Hungary, France, and Taiwan.

His pioneering work on excited-state photon transfer mechanisms has led to innovative advances in fluorescence sensing and imaging, particularly through the development of dual-color ratiometric fluorescence probes. He has also extended the Weber red edge effect to applications in spectroscopy, excited-state electron and proton transfer reactions, and energy transfer processes.