{"product_id":"oxidative-stress-and-antioxidant-defenses-in-biology-von-sami-ahmad","title":"Oxidative Stress and Antioxidant Defenses in Biology","description":"\u003cp\u003eThe ground-state of molecular oxygen, O , is essential to many 2 indispensible metabolic processes of all aerobic life forms ranging from prokaryotes, protists, plants, and fungi to animals. Research by mammalian toxicologists and clinicians has unravelled persua­ sive evidence that O dependence imposes universal toxicity to all 2 aerobic life processes. The basis of this paradox is that one-electron reduction of O2 generates the superoxide anion free radical, 0;-, from numerous biological sources; for example, redox-active autoxidizable molecules such as catecholamines, oxidoreductases, and subcellular organelles such as mitochondria, endoplasmic reti'C­ ulum (microsomes), nuclei, and chloroplasts. Oxygen is also acti­ vated in biologically relevant photosensitizing reactions to highly re­ active singlet oxygen, 10 , 2 In all biological systems, 0;- undergoes further reduction to H 0 2 2 via Fenton reaction to the hydroxyl radical, ·OH. These, and some other forms of activated O , constitute reactive oxygen species (ROS) 2 and\/or metabolites (ROM). Both 'OH and 10 are the most reactive 2 forms of ROS known and among their deleterious reactions are ox­ idation of proteins, DNA, steroidal compounds, and peroxidation of the cell membrane's unsaturated lipids to form unstable hydro­ peroxides. Their many breakdown products include malondialde­ hyde and hydroxynonenals that are themselves highly reactive and threaten cellular integrity and function. More importantly, they de­ compose to free radicals that can continue to propagate the vicious lipid peroxidation chain reaction. This is the so-called endogenous oxidative stress with which all aerobic organisms must cope.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9781461596912\"\u003e\u003ch3\u003e\u003c\/h3\u003e\u003c\/div\u003e","brand":"Libri","offers":[{"title":"Softcover - 9781461596912","offer_id":39416971853917,"sku":"9781461596912","price":53.49,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/1c989b88-9218-4ad0-acbe-4b77db6927a6.jpg?v=1775707676","url":"https:\/\/shop.autorenwelt.de\/products\/oxidative-stress-and-antioxidant-defenses-in-biology-von-sami-ahmad","provider":"Autorenwelt Shop","version":"1.0","type":"link"}