According to Cooper (1988) '... a literature review uses as its database reports of primary or original scholarship, and does not report new primary scholarship itself. The primary reports used in the literature may be verbal, but in the vast majority of cases reports are written documents.
Reactive oxygen species. Reactive oxygen species (ROS) are chemically reactive chemical species containing oxygen. Examples include peroxides, superoxide, hydroxyl radical, and singlet oxygen. In a biological context, ROS are formed as a natural byproduct of the normal metabolism of oxygen and have important roles in cell signaling and homeostasis.
Monoamine oxidase A. Monoamine oxidase A, also known as MAO-A, is an enzyme that in humans is encoded by the MAOA gene. Monoamine oxidase A is an isozyme of monoamine oxidase.It preferentially deaminates norepinephrine (noradrenaline), epinephrine (adrenaline), serotonin, and dopamine (which is equally deaminated by MAO-A and MAO-B).t is inhibited by clorgyline and befloxatone. Inhibition of both MAO-A and MAO-B using a monoamine oxidase inhibitor (MAO inhibitor) is used in the treatment of clinical depression, erectile dysfunction and anxiety.