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Let Rbe a 2-torsion free semiprime *-ring, σ, τtwo epimorphisms of Rand f, d: R→ Rtwo additive mappings. In this paper we prove the following results: (i) dis a Jordan (σ, τ)*-derivation if and only if dis a Jordan triple (σ, τ)*-derivation. (ii) fis a generalized Jordan (σ, τ)*-derivation if and only if fis a generalized Jordan triple (σ, τ)*-derivation.Let Rbe a 2-torsion free semiprime *-ring, σ, τtwo epimorphisms of Rand f, d: R→ Rtwo additive mappings. In this paper we prove the following results: (i) dis a Jordan (σ, τ)*-derivation if and only if dis a Jordan triple (σ, τ)*-derivation. (ii) fis a generalized Jordan (σ, τ)*-derivation if and only if fis a generalized Jordan triple (σ, τ)*-derivation.

Abstract: The platelet-activating factor (PAF) is an inflammatory mediator and it may exert some of its effects by reactive oxygen species (ROS). We investigated the effects of PAF and hyperbaric oxygenation (HBO) on copper (Cu) and zinc (Zn) levels in plasma and the intracellular antioxidant enzyme activities of rats. PAF administration caused a decrease in erythrocyte catalase (CAT) and glutathione peroxidase (GPx) activities and in the plasma zinc level. Following PAF administration, exposure to HBO also caused a decrease in erythrocyte GPx activity. These results support the hypothesis that PAF may produce free oxygen radicals and HBO enhances this effect. The enzyme activities of the antioxidant defense system were found to be affected by these oxidative processes. This is likely to be the result of excessive production of ROS or overutilization and/or inhibition of the antioxidant enzymes.