Results 341 to 350 of about 5,663,581 (403)
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1986
It is now clear that free radical intermediates often are involved in the activation of many types of procarcinogens and promutagens to their active forms as well as in the binding of these activated species to DNA. In this chapter, a general introduction to free radical chemistry is presented, with some discussion of radical lifetimes and reactivities.
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It is now clear that free radical intermediates often are involved in the activation of many types of procarcinogens and promutagens to their active forms as well as in the binding of these activated species to DNA. In this chapter, a general introduction to free radical chemistry is presented, with some discussion of radical lifetimes and reactivities.
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Free Radicals in the Atmosphere
Free Radical Research Communications, 1987Like the oxidation in a flame, the oxidation in the atmosphere is mediated by free radicals. Unlike a flame, however, atmospheric oxidation needs an external source of energy: the sun light. In fact the most important radical acting in the lower atmosphere, the hydroxyl radical, OH, is produced following the UV-photolysis of ozone, O3, which yields an ...
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The British Journal of Radiology, 2001
Mention medical imaging and most radiologists and medical physicists will think of CT, MRI, ultrasound and nuclear medicine, the techniques that form the backbone of diagnostic radiology. Nevertheless, there are a number of other methods currently under development that are potentially capable of producing extremely valuable functional information. One
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Mention medical imaging and most radiologists and medical physicists will think of CT, MRI, ultrasound and nuclear medicine, the techniques that form the backbone of diagnostic radiology. Nevertheless, there are a number of other methods currently under development that are potentially capable of producing extremely valuable functional information. One
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Modulation of platelet function by free radicals and free-radical scavengers
Trends in Pharmacological Sciences, 1993Platelets have the capacity to generate oxygen-derived free radicals and are often present at inflammatory foci with other free-radical-generating cells such as white blood cells. Free radicals can modify platelet adhesion and aggregation directly or through effects on the vascular endothelium, which generates prostacyclin and nitric oxide.
Daniela Salvemini, Regina M. Botting
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Free Radical Biology and Medicine, 1988
The role of active oxygen species in diabetes is discussed in this review. Type I diabetes is caused by destruction of the pancreatic beta cells responsible for producing insulin. In humans, the diabetogenic process appears to be caused by immune destruction of the beta cells; part of this process is apparently mediated by white cell production of ...
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The role of active oxygen species in diabetes is discussed in this review. Type I diabetes is caused by destruction of the pancreatic beta cells responsible for producing insulin. In humans, the diabetogenic process appears to be caused by immune destruction of the beta cells; part of this process is apparently mediated by white cell production of ...
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Seminars in Reproductive Medicine, 1998
Partial reduction of molecular oxygen can generate reactive oxygen species (ROS), including the hydrogen peroxide, and the free radicals superoxide and hydroxyl. The formation of ROS is a feature of many degenerative diseases, such as atherosclerosis and neurodegeneration, Organisms contain a battery of defense mechanisms to prevent the formation of ...
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Partial reduction of molecular oxygen can generate reactive oxygen species (ROS), including the hydrogen peroxide, and the free radicals superoxide and hydroxyl. The formation of ROS is a feature of many degenerative diseases, such as atherosclerosis and neurodegeneration, Organisms contain a battery of defense mechanisms to prevent the formation of ...
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The Significance of Free Radicals and Free Radical Scavengers in L1210 Leukemia
1988L1210 leukemia is a murine leukemia which is associated with anemia and marked neutrophilia. In order to determine the significance of free radicals (FR) in this disorder, we determined the presence and localization of free radical scavengers (FRS) and scavenger-like systems in L1210 leukemia cells obtained in vivo and from in vitro cultures.
J. D. Lutton, A. C. Brown
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Free radicals and antioxidants in normal physiological functions and human disease.
International Journal of Biochemistry and Cell Biology, 2007M. Valko +5 more
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Free radical theory of aging: The “free radical” diseases
AGE, 1984The free radical theory of aging postulates that free radical reactions are responsible for the progressive accumulation of changes with time associated with or responsible for the ever-increasing likelihood of disease and death that accompanies advancing age.
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Free radicals, metals and antioxidants in oxidative stress-induced cancer.
Chemico-Biological Interactions, 2006M. Valko +4 more
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