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Start Over Coverage 109-118

2. Patočkova praktická filozofie jako analýza modernity

Creator:
Šrubař, Ilja
Format:
print
Type:
model:internalpart and TEXT
Subject:
Jan Patočka, Czech philosophy - history of, phenomenology, and practical philosophy
Language:
Czech
Description:
Jan Patočka, a disciple of Husserl and Heidegger, was the most eminent Czech philosopher of the 20th century. The article focuses on his concept of practical philosophy, which is seen as a constitutive force in European modernity. As such it has critical, dynamic, and stabilising effects. In this sense it is always closely related to politics and can both motivate social change and legitimise stable political orders. The consequences of this are demonstrated in liberalism and socialism as the two major projects of modern thought.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Spectroscopic analiysis of chlorophyll bleaching in heat-pretreated thylakoid membranes isolated from cucumber cotyledons

Creator:
Waloszek, A., Tulej, M., and Wbeckowski, S.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Effects of heat pre-treatment (60 oC for 15 min) on the chlorophyll (Chl) bleaching and excitation energy transfer in thylakoids, isolated from the cucumber cotyledons, were studied by anaiysis of the overlapping absorption and the low temperature fluorescence spectra. The Chl forms C678 and C672 appeared to be the most heat-susceptible components, whereas C684 was found to be very heat-stable. Subsequent exposure of the thylakoid suspension to a high photon flux density (ca. 3 500 pmol m‘2 s'i) caused further bleaching of all the tested forms: ca. 8-20 or 2-5 % of chlorophyll was degraded duríng the initial (0-4 min) or later (4-10 min) period of irradiation, respectively. The heat pre-treatment of thylakoids led to the decrease of the 472 and 486 nm bands in Chl fluorescence excitation spectrum and the 730 nm band in the Chl fluorescence emission spectrum. The F730/F685 ratio decreased by ca. 4-, 3- or 2-fold when excited with the wavelengths of 437, 742 or 486 nm, respectively. These ratios increased by 60-90 % after 10 min irradiation with high photon flnx density.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Stomatal and nonstomatal limítations to photosynthesís in two wheat cultivars subjected to water stress

Creator:
Kicheva, M.I., Tsonev, T.D., and Popova, L.P.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Two wheat {Triticum aestivum L.) cultivars, Trakia (drought-sensitive, DS) and Slavianka 196 (drought-tolerant, DT), were subjected to water stress induced by polyethyleneglycol (PEG) 6000; 15 % PEG for 6 h (mild stress); 25 % PEG for 6 h and 15 % PEG for 24 h (severe stress). Exposure of plants to water stress led to a noticeable decrease in both the initial slope of net photosynthetic rate to intercellular CO2 concentration {Pfilc^ curves and the maximum P-^. Ribulose 1,5-bisphosphate carboxylase (RuBPC) activity was almost unchanged under mild stress while under severe stress it was reduced by about 26-27 %. The ratio of variable to maximal chlorophyll fluorescence did not change which implied that there was little effect of examined stress conditions on the photosystem 2 electron transport. The relative magnitude of stomatal and nonstomatal factors in limitation of photosynthesis depended on stress severity.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public