Senescence-induced changes in the xanthophyll cycle activity and chlorophyll (Chl) fluorescence parameters were compared in detached barley (Hordeum vulgare L.) leaf segments kept for 6 d in darkness or under continuous " white light" (90 μmol m-2 s-1). Before detachment of the leaf segments, the plants were grown at periodic regime [12 h light (90 μmol m-2 s-1)/12 h dark]. The de-epoxidation state of the xanthophyll cycle pigments (DEPS) in the leaf samples was determined immediately (the actual DEPS), after 1 h of dark-adaptation (the residual DEPS), and during 14 min of a high-irradiance (HI) exposure (500 μmol m-2 s-1) (HI-induced DEPS). In the light-senescing segments, senescence was delayed pronouncedly compared to dark-senescing ones as the Chl content, the photosystem 2 photochemistry, and electron transport processes were highly maintained. Further, the actual DEPS increased, probably due to the increased mean photon dose. The HI-induced increase in the DEPS was stimulated in the light-senescing segments, whereas it was slowed down in the dark-senescing ones. However, after the 14 min HI-exposure of the dark-senescing segments the HI-induced DEPS was not markedly lower than in the mature leaves, which indicated the maintenance of the xanthophyll cycle operation. and M. Špundová, K. Strzałka, J. Nauš.
In South Bohemia, Czech Republic, 178 shrews, including 98 common shrews, Sorex araneus L., 70 pygmy shrews, Sorex minutus L., and 10 lesser white-toothed shrews, Crocidura suaveolens (Pallas), were examined for Soricimyxum fegati Prunescu, Prunescu, Pucek et Lom, 2007 infections, using squash preparations of unfixed tissues, histological sections and molecular methods. The infection was found in 51 (52%) S. araneus, 14 (20%) S. minutus and 1 (10%) C. suaveolens. The records of the latter two species extend host range of S. fegati. Lesions associated with S. fegati infections in the liver, the organ of specific localisation of the parasite, were found to be induced by proliferative stages migrating toward lumina of bile ducts. In other organs of these three host species, xenoma-like formations (XLFs) were found that severely injured blood vessels. XLFs contained presporogonic stages of S. fegati, whose species identity was evidenced using molecular methods.
Od nástupu páté generace čínských vůdců k moci v listopadu 2012 se pozorovatelé Číny intenzivně zamýšlejí nad tím, zda se Xi Jinpingovu vedení podaří obnovit reformní proces zpomalený během předcházející dekády. Velmi diskutovaná je i úzce související otázka, zda se v Xi Jinpingovi vrací do čínské politiky postava individuálního autoritářského vůdce Mao Zedongova ražení., The article researches the rule of Xi Jinping's fifth generation of Chinese leaders, from their rise to power at the 18th Congress of the Communist Party of China in November 2012 until June 2014. It describes some of the organizational aspects of the most recent power transition and examines the most important document of the Xi administration so far available to us, The Decision on Major issues Concerning the Comprehensive Deepening of Reforms, announced after the Third Plenary Session of the 18th CPC Central Committee in November 2013. The article further outlines the impact of the Decision, particularly the formation of several new leading groups and their allocated tasks. The text further addresses the question as to whether Xi Jinping's strong position signals the return to Chinese politics of the Mao-style individual authoritarian rule. The research draws on sources such as official documents, media statements and news articles, as well sas on several relevant articles., Ondřej Klimeš., and Obsahuje bibliografii