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In chemistry and biology, reactive oxygen species (ROS) are highly reactive chemicals formed from diatomic oxygen (O 2), water, and hydrogen peroxide. Some prominent ROS are hydroperoxide (H 2 O 2), superoxide (O 2 −), [1] hydroxyl radical (OH.), and singlet oxygen(1 O 2). [2] ROS are pervasive because they are readily produced from O 2 ...
Reactive nitrogen species act together with reactive oxygen species (ROS) to damage cells, causing nitrosative stress. Therefore, these two species are often collectively referred to as ROS/RNS. Reactive nitrogen species are also continuously produced in plants as by-products of aerobic metabolism or in response to stress. [3]
ROS are reduced oxygen intermediates that include the superoxide radical (O 2 −) and the hydroxyl radical (OH•), as well as the non-radical species hydrogen peroxide (H 2 O 2). These ROS are important in the normal functioning of cells, playing a role in signal transduction [1] [2] and the expression of transcription factors.
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Image credits: Michael Buckner / Getty #3 Scott Disick. Boxes of Mounjaro, which is known for its weight loss effects, were found stacked in Scott Disick’s fridge on a past episode of The ...
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Mitochondrial ROS attack DNA readily, generating a variety of DNA damages such as oxidized bases and strand breaks. The major mechanism that cells use to repair oxidized bases such as 8-hydroxyguanine, formamidopyrimidine and 5-hydroxyuracil is base excision repair (BER). [14] BER occurs in both the cell nucleus and in mitochondria.
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