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The contents of endogenous brassinosteroids (BRs) together with various aspects of plant morphology, water management, photosynthesis and protection against cell damage were assessed in two maize genotypes that differed in their drought sensitivity. The presence of 28-norbrassinolide in rather high quantities (1-2 pg mg-1 fresh mass) in the leaves of monocot plants is reported for the first time. The intraspecific variability in the presence/content of the individual BRs in drought-stressed plants is also described for the first time. The drought-resistant genotype was characterised by a significantly higher content of total endogenous BRs (particularly typhasterol and 28-norbrassinolide) compared with the drought-sensitive genotype. On the other hand, the drought-sensitive genotype showed higher levels of 28-norcastasterone. Both genotypes also differed in the drought-induced reduction/elevation of the levels of 28-norbrassinolide, 28-norcastasterone, 28-homocastasterone and 28-homodolichosterone. The differences observed between both genotypes in the endogenous BR content are probably correlated with their different degrees of drought sensitivity, which was demonstrated at various levels of plant morphology, physiology and biochemistry.

To have more detailed information about rock massif behaviour, distributed control and measurement network for evaluation of hydrologic, geomechanical and other parameters has been built up in the medieval Jeroným Mine from the first half of 2006. Instrumentation is generally based on commercial control kit and sensors. This network is integrated to the seismic recording apparatus equipped by data transmission via GSM network to registration centre in Ostrava. Completely monitoring system is performed as modular to have possibility to change configuration of this system.

AbstractReview: 141 refs.

Color-changing fluorescent nucleotide and oligonucleotide probes for studying interactions with other biomolecules were designed and prepared, and perform better than currently known environment-sensitive fluorophores.

Chromosome pairing in meiosis usually starts in the vicinity of the telomere attachment to the nuclear membrane and congregation of telomeres in the leptotene bouquet is believed responsible for bringing homologue pairs together. In a heterozygote for an inversion of a rye (Secale cereale L.) chromosome arm in wheat, a distal segment of the normal homologue is capable of chiasmate pairing with its counterpart in the inverted arm, located near the centromere. Using 3D imaging confocal microscopy, we observed that some telomeres failed to be incorporated into the bouquet and occupied various positions throughout the entire volume of the nucleus, including the centromere pole. Rye telomeres appeared ca. 21 times more likely to fail to be included in the telomere bouquet than wheat telomeres. The frequency of the out-of-bouquet rye telomere position in leptotene was virtually identical to the frequency of telomeres deviating from Rabl's orientation in the nuclei of somatic cells, and was similar to the frequency of synapsis of the normal and inverted chromosome arms, but lower than the MI pairing frequency of segments of these two arms normally positioned across the volume of the nucleus. Out-of-position placement of the rye telomeres may be responsible for reduced MI pairing of rye chromosomes in hybrids with wheat and their disproportionate contribution to aneuploidy, but appears responsible for initiating chiasmate pairing of distantly positioned segments of homology in an inversion heterozygote.

This reflection is inspired by a discussion among leading intermedialists organized by UNISC, Brazil, fall 2021. It included contextualization and conceptualization, i.e. setting the current research within the context of the discipline’s development and the synchronic study of culture, proposing new concepts or defending old ones. The key term ‘in-between’ expresses both a trend in art, and in the self-reflecting intermedial methodology. It becomes obvious that intermedial research opens up wide to analyzing issues of social importance. In our exposition, we assess the debated concepts in terms of their analytical and educational potential in literary and cultural studies, and relate the debate to the Czech environment.

For the purposes of trace analysis of 1,4-androstadiene-3,17-dione (ADD), 1,4-androstadiene-3-one-17β-ol (Boldenone) and 17-β-estradiol in water, waste water, soil and for the further phytosterols transformation studies the enolisation-silylation reaction was studied using MSTFA and BSTFA with different catalysts as derivatization reagents. The different reaction conditions and stability of the products was also studied using GC-MS technique.

This paper explores the notion that minimum wages affect different lowskilled workers asymmetrically due to productivity differences. In a search model with worker heterogeneity, a rising minimum wage lowers the employment and labor force participation of the least productive workers by pricing them out of the market, while having the opposite effect on other low-skilled workers that remain hirable. CPS data supports these predictions; a rise in the minimum reduces the employment and labor force participation of teenagers with less than high school education, but has the opposite effect on prime-age workers with high school attainment. The calibrated model requires small firm surpluses to match these observations. If firm surplus is small due to high nonmarket activity values, a moderate rise in the minimum improves aggregate welfare even when the worker's bargaining weight is high.