Oxygen molecule in the ground state is relatively reactive . However, it can be the source of the reactive derivative , called reactive oxygen species (ROS ) , both produced as a result of the metabolic activity of cells , as well as plants after exposure to various stress factors . In a progressive one-electron reduction of oxygen occurs to produce partially reduced intermediates , which are in the order of superoxide anion radical ( O2 - • ) , hydrogen peroxide (H2O2 ) and hydroxyl radical ( • OH) .

Nitric oxide (NO) is a free radical that has been extensively studied as a substance causing air pollution and the product of metabolism of certain groups of bacteria. Ways to download it, metabolism and harmful effects on plants are well established. It turned out , however, that not only the plants respond to changes in the NO concentration in the environment, but they are in a position to produce it .

Reactive oxygen species ( ROS) , which include superoxide anion ( O2. ) , hydroxyl radical (OH) , hydrogen peroxide (H2O2) , singlet oxygen ( 1O2 ) and nitric oxide (NO) are highly reactive particles. Can react with lipids, proteins or DNA , causing irreversible changes in the structure of these compounds. Platelets , like other cells , can generate ROS , which are drawn into the mechanisms of activation of these cells . There are several ways to manufacture platelet RFT .