Romanova Elena B. RussiaNizhny NovgorodLobachevsky State University of Nizhni Novgorod, 23 Gagarin Avenue, Nizhni Novgorod 603950, Russiaromanova@ibbm.unn.ru Author's articles Leukocyte blood composition of Naturix natrix (Serpentes: Colubridae) in the Mordovian State Nature Reserve (Russia) Comparative leukocyte blood profile of Emys orbicularis (Reptilia: Emydidae) from two populations Age differences in the leukocyte blood composition of the common viper Vipera berus (Reptilia: Serpentes: Viperidae) On the issue of sex differences in metric characters in Anguis colchica (Nordmann in Demidoff, 1840) (Anguidae, Reptilia) Adaptive blood reactions of Testudo graeca nikolskii Ckhikvadze et Tuniyev, 1986 (Testudinidae, Reptilia) Functional activity of the immune system of Pelophylax ridibundus (Amphibia: Ranidae) in environmental stress conditions