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    Chen-like inequalities on lightlike hypersurfaces of a Lorentzian manifold
    (2013) Gülbahar M.; Kilic E.; Keles S.
    We introduce k-Ricci curvature and k-scalar curvature on lightlike hypersurfaces of a Lorentzian manifold. We establish some inequalities between the extrinsic scalar curvature and the intrinsic scalar curvature. Using these inequalities, we obtain some characterizations on lightlike hypersurfaces. We give some results with regard to curvature invariants and S(n1, ? , nk)-spaces for lightlike hypersurfaces of a Lorentzian manifold. © 2013 Gülbahar et al.
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    House dust-mites: Effect on antioxidant enzyme activities
    (2006) Karabulut A.B.; Atambay M.; Karaman U.; Kilic E.; Yazar S.; Saraymen R.; Daldal N.
    Background: House dust-mites are potent allergens of the indoor environment and are common inhabitants of houses worldwide. Free radicals are constantly produced by cells, mostly as reactive oxygen species. Once produced, free radicals are removed by antioxidant defenses, including the enzymes SOD, GPx, and CAT. Material/Methods: The aim was to describe the importance of the antioxidant enzymes SOD, GPx, and CAT co-acting in human cells against toxic reactive oxygen species and their relationship with pathophysiological processes in subjects who have dust-mites in their homes. Results: The activities of erythrocyte GPx and SOD in skin-test-positive (dust-mite-positive/negative) patients were significantly lower than those in dust-mite- and skin-test-negative controls (p<0.05). Among the skin-test-positive patients, SOD activity was found to be lower in dust-mite-positive than in dust-mite-negative patients (p<0.05). There was not a statistically significant difference between the CAT levels of skin-test-positive (dust-mite-positive/negative) patients and dust-mite- and skin-test-negative controls (p>0.05). Conclusions: This study clearly shows that dust-mite depresses the activities of SOD, GPx, and, to a small extent, CAT, which influence cellular reducing capacity and consequently may increase asthma risk more than other allergens. © Med Sci Monit, 2006.