... Fethi Ceylan3 1. Yuzuncu Yil University, Medical Faculty, Department of Physical Medicine Rehabilitation and Rheumatology, Van, Turkey; 2. Yuzuncu Yil University, Medical Faculty, Department ... phosphory-lation and repetitive cycles of hypoxia and reoxygen-ation, along with oxidants produced by phagocytic cells such as macrophages and neutrophils, lead to chronic oxidative stress in the ... (CAT) analysis CAT (EC 1.11.1.6) activity was determined by the method of Aebi [16]. The principle of the assay is based on the determination of the rate constant (s−1, k) of the H2O2...