drought stress is one of the serious problems that restricted agronomic plant production worldwide. inmolecular level, the harmful effect of drought stress is mostly caused by producing of large amount ofreactive oxygen species (ros). catalase and metallothionein genes have a crucial role to mope the hydrogenperoxide (h2o2) resulting reducing oxidative damage. in this research the gene expressi...

background: lead, an example of heavy metals, has, for decades, being known for its adverse effects on various body organs and systems such that their functions are compromised. objective: in the present study, the ability of lycopersicum esculentum on decrease toxic effects of lead acetate on plasma superoxide dismutase, catalase and malondialdehyde in rat. lead to adversely affect the liver t...

Visible light at high intensity was found to kill bacteria while low-power light in the visible and near infrared region enhances bacterial proliferation. The present review summarizes evidence demonstrating that the mechanism of visible light- bacteria interaction involves reactive oxygen species (ROS) generation. The ROS are photo induced by bacterial endogenous photosensitizers. Phototoxic e...

rheumatoid arthritis is a disease associated with painful joints that affects approximately 1% of the population worldwide, and for which no effective cure is available. it is characterized by chronic joint inflammation and variable degrees of bone and cartilage erosion. oxygen metabolism has an important role in the pathogenesis of rheumatoid arthritis. reactive oxygen species (ros) are produc...

Oxygen-free radicals, more generally known as reactive oxygen species (ROS) along with nitrogen species (RNS) are well recognised for playing a dual role both deleterious and beneficial species. The cumulative generation of ROS/RNS through either endogenous or exogenous insults is termed oxidative stress and is common for many types of diseases that are linked with altered redox regulation of c...