**Meet the editor**

Toonika Rinken is a senior researcher of environmental chemistry at the University of Tartu, Estonia. She received her PhD degree in chemistry in 2000 at the same university, for the modeling and calibration studies of biosensors and has passed professional self-improvement in Uppsala (Sweden) and Gröningen (the Netherlands). Dr. Rinken leads a biosensor lab whose research

is focused on the studies of construction and signal rising in biosensor based analytical systems, and the development of biosensor arrays for rapid monitoring of biomarkers and hazardous compounds in environment and food.
