National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Tvorba terpenoidů u buku lesního v podmínkách zvýšené koncentrace CO2 a UV záření.
Pernicová, Natálie
Plants release a wide spectrum of biogenic volatile organic compounds into the envi-ronment. These compounds attract pollinators and can protect plants against pests and/or biotic and abiotic stresses. I have investigated the impact of different UV radiation in-tensities and elevated atmospheric CO2 concentrations on the content of terpenoids in the leaves of European beech during the vegetation season. The trees were growing un-der the elevated (EC; 700 ppm) and ambient CO2 concentration (AC; 400 ppm) and at three UV radiation intensities - ambient (UVamb), enhanced (150 %; UV+), and excluded (UV–). The results show that AC trees had higher content of monoterpenes than EC trees during the whole vegetation season. Limonene and 2-bornene were found to be the most abundant monoterpenes located in the beech leaves. The highest content of 2-bornene was found in AC plants cultivated under UV– radiation. The contents of α-pinene gradually decreased during the vegetation season, while the content of limonene was increasing.Formula clause:
Variabilita obsahu silic kmínu kořenného ( Carum carvi,L.)
Urbánek, Jiří
The aim of the thesis was to prove the variability of the essence content by 36 evaluated samples (tribes) from the chosen new selection of caraway (Carum carvi L.). Caraway, its morphology, origin and spread was described in the literary part. It is followed by the summary of its most important use, its cultivating technology and the state of health was also described shortly. Next chapter devoted to the selection of apiaceae species with a view to caraway. Last two chapters describe plant essences and the content matters of caraway. The practical part gives an idea of individual samples (tribes), then the distillation with steam for finding of essence content and gas chromatography, which the analysis of limonene and carvone content was done, was described. The samples (tribes) number 25, 27, 34, 35 and 3 were evaluated as the best for the next selection from the standpoint of essence content and they had the right proportion of carvone to limonene.

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