Photosynthesis, chlorophyll (Chl) a fluorescence, and nitrogen metabolism of hawthorn (Crataegus pinnatifida Bge.), subjected to exogenous L-glutamic acid (GLA) (200 mg l-1, 400 mg l-1, and 800 mg l-1) that possibly affect secondary metabolic regulation, were measured. The results indicated that photosynthetic and fluorescence characteristics of hawthorn exhibited positive responses to the application of GLA. Different concentrations of GLA caused an increase in Chl content, net photosynthetic rate
(PN) and stomatal conductance (g s) as well as transpiration rate (E), and improved the carboxylation efficiency (CE), apparent quantum yield (AQY) and maximum carboxylation velocity of Rubisco (Vcmax). Application of GLA could also enhance the maximum ratio of quantum yields of photochemical and concurrent non-photochemical processes in PSII (Fv/F0), the maximal quantum yield of PSII (Fv/Fm), the probability that an absorbed photon will move an electron into the electron transport chain beyond QA (ΦEo) as well as the performance index on absorption basis (PIABS), but decreased the intercellular CO2 concentration
(Ci) and the minimal fluorescence (F0). Application of GLA also induced an increase in nitrate reductase (NR; EC 1.6.6.1) and glutamine synthetase (GS; EC 6.3.1.2) activities, and increased the soluble protein content, leaf nitrogen (N) content and N accumulation in leaves as well as the plant biomass. However, the effects were different among different concentrations of GLA, and 800 mg l-1 GLA was better. This finding suggested that application of GLA is recommended to improve the photosynthetic capacity by increasing the light energy conversion and CO2 transfer as well as the photochemical efficiency of PSII, and enhanced the nitrogen metabolism and growth and development of plants. and C. YU ... [et al.].
Der Autor beschäftigt sich mit der Persönlichkeit des Regimentskommandanten der tschechischen Legion J. J. Švec (1883-1918). Es werden Umstände beschrieben, die J. J. Švec zur Mitgliedschaft in der Legion gebracht haben, seine demokratische Gesinnung betont und Tatsachen gezeigt, die zu dem tragischen Ende seines Lebens führten, und nicht zuletzt wird die Unnahmbarkeit seiner Botschaft seitens totalitärer Regime erwähnt.
This work summarizes the properties of chosen new scintillation and phosphor materials which appeared in the literature during past ten years and corresponding trends in the research and development in the field of the scintillation materials. The most important applications are mentioned as well as they strongly support research activities in this area., Práce sumarizuje vlastnosti vybraných nových scintilačních a fosforových materiálů, které se objevily v literatuře v posledních deseti letech a související trendy ve výzkumu a vývoji v této oblasti, Jsou zmíněny i nejdůležitější aplikace, které výzkumné aktivity stimulují., Vítězslav Jarý, Martin Nikl., and Obsahuje bibliografii