The tubenose goby has been reported to be the first non-native postglacial gobiid immigrant from the Lower Danube refuges. It is thus a pioneer species that was the forerunner of the extensive invasion of Ponto-Caspian gobies that ascended the River Danube and spread across Europe a century before other goby species. It appears that recently the tubenose goby invasion has accelerated. In this paper historical data on the distribution of the tubenose goby, together with data from extensive monitoring of fish communities in Slovakia are examined to evaluate both the temporal and spatial aspects of tubenose goby distribution dynamics. Until the 1990s, the species was recorded only in the River Danube and small water bodies in the Danubian Lowland (Slovakia). Since then the tubenose goby has spread upstream into tributaries of the River Danube. It was also recorded in several streams in eastern Slovakia after 2014, and the spatial data demonstrate that the tubenose goby has been colonising new water bodies, progressing to the north and ascending rivers, reaching higher altitudes than previously reported. These findings suggest that the tubenose goby deserves attention, even after two centuries following the onset of its invasion, and its further expansion across Europe should be carefully monitored.
Tuková tkáň je endokrinní orgán produkující početné cytokiny. Změna v jejich regulacích může být příčinou patologických pochodů u obézních jedinců. Význam tukové tkáně ve vztahu k diabetu a ateroskleróze je intenzivně studován., Adipose tissue is an endocrine organ that produces numerous cytokines. Their dysregulations cause morbidity in obese individuals. The importance of this tissue in relation to diabetes and atherosclerosis is the subject of intense research., and Ilja Trebichavský, Petr Šíma.
Tumor necrosis factor a (TNFa) was found to be significantly increased in skeletal muscles and retroperitoneal fat of obese insulin-resistant Koletsky rats as compared to control Wistar rats. This increase was accompanied by a depression of insulin receptor protein tyrosine kinase (PTK) activity. Neither the insulin-binding capacity nor insulin receptor affinity were related to this TNFa increase in these tissues. In the liver, no significant changes of TNFa content and only a lowering of insulin-binding capacity were found. It is concluded that an increased TNFa content in muscles and fat (but not in the liver) contributes to insulin resistance by lowering insulin receptor protein tyrosine kinase activity, while other insulin receptor characteristics (insulin-binding capacity and affinity of insulin receptors to the hormone) do not seem to be influenced by this factor., A. Hřebíček, M. Rypka, Z. Chmela, J. Veselý, M. Kantorová, V. Golda., and Obsahuje bibliografii
Průběh koryta a niva Lužnice zaznamenaly po povodních v roce 2002 a 2006 značné změny. Vznikla nová mrtvá ramena a tůně. Tyto změny ale neměly výrazný destruktivní vliv na ekosystém nivy. Autor popisuje různé typy tůní a procesy jejich vzniku a zániku i společenstva mokřadních rostlin v nivě Lužnice. and The watercourse and floodplain of the Lužnice river were greatly changed after flooding in 2002 and 2006. New river branches and pools were created, but these changes have not influenced negatively floodplain ecosystems. The author describes different types of pools and their development, as well as communities of wetland plants in the Lužnice river floodplain.
V práci jsou ukázány možnosti distanční a napěťové tunelové spektroskopie na vzduchu a v elektrolytu. Jako příklad je uvedena distanční tunelová spektroskopie zlata v kyselině sírové a napěťová tunelová spektroskopie zlata na vzduchu a anatasu ve fosfátovém pufru., Jan Weber, Hana Pelouchová, Pavel Janda., and Obsahuje seznam literatury