Benzoxazolin-2-(3H)-one (BOA) has been tested in many plants species, but not in soybean (Glycine max). Thus, a hydroponic experiment was conducted to assess the effects of BOA on soybean photosynthesis. BOA reduced net photosynthetic rate, stomatal conductance, and effective quantum yield of PSII photochemistry without affecting intercellular CO2 concentration or maximal quantum yield of PSII photochemistry. Results revealed that the reduced stomatal conductance restricted entry of CO2 into substomatal spaces, thus limiting CO2 assimilation. No change found in intercellular CO2 concentration and reduced effective quantum yield of PSII photochemistry revealed that CO2 was not efficiently consumed by the plants. Our data indicated that the effects of BOA on soybean photosynthesis occurred due to the reduced stomatal conductance and decreased efficiency of carbon assimilation. The accumulation of BOA in soybean leaves reinforced these findings. and Obsahuje bibliografii
Beta-integers were defined as a generalization of integers by Alfréd Rényi in 1957 in the course of his study of expansions of real numbers in non-integer bases. Together with mathematicians, crystallographers are also interested in this unusual structure. They have found out that beta-lattices are in particular convenience for the description of quasicrystals and their diffraction images., Ľubomíra Balková., and Obsahuje bibliografii
In this article, the author traces the changes in the Czechoslovak position in the international Communist movement after the Communist Party took power in Czechoslovakia. She concentrates on the Party’s relations with the Soviet and the Chinese Communists, which from the 1950s onwards represented two competing centres of power in world Communism. She argues that in Czechoslovak foreign policy the Communists subordinated the defence of State interests to the international solidarity of the workers, and, in keeping with that ideological guideline, the tasks of Czechoslovak foreign policy were set mainly according to the Soviet agenda and its vaguely defi ned aims for the international Communist movement. Prague became dependent on Moscow for personnel, information, and material, and lost the ability to act independently in international politics both outside and inside the Soviet bloc. Amongst Prague’s priorities were efforts to achieve the unity of the Soviet system of alliances and, beginning at the latest in 1956, it considered military intervention a suitable instrument in the event of a threat to that system. A comparative analysis of records for the ten years from 1953 to 1962, from the Archive of the Ministry of Foreign Affairs of the Czech Republic and from the Czechoslovak Communist Party leadership, which are deposited in the National Archive, Prague, demonstrate that Czechoslovak foreign policy was actually formed by way of inter-Party contacts. The Soviet Communists were paramount in the hierarchy; in the eyes of the Czechoslovak Communists, the Soviet position remained unchallenged by any Chinese attempts to provide an alternative to Soviet methods and plans to develop the international Communist movement in the late 1950s and early 1960s. Indeed, at multilateral talks amongst dozens of Communist Parties in Moscow in November 1957 and in 1960, where Chinese objections were discussed, Czechoslovak Communists arrived after having been instructed by their Soviet comrades, and from this position they rejected all Chinese activities, despite Czechoslovak efforts to establish friendly and close ties with their Beijing comrades after 1948. As a result of this linking of Czechoslovak Party and State matters, Czechoslovak-Chinese collaboration ceased in the early 1960s, and the Soviet Union promised to compensate for any damages that thus accrued to the Czechoslovak economy.
Although slurs are conventionally defined as derogatory words, it has been widely noted that not all of their occurrences are derogatory. This may lead us to think that there are “innocent” occurrences of slurs, i.e., occurrences of slurs that are not harmful in any sense. The aim of this paper is to challenge this assumption. Our thesis is that slurs are always potentially harmful, even if some of their occurrences are nonderogatory. Our argument is the following. Derogatory occurrences of slurs are not characterized by their sharing any specific linguistic form; instead, they are those that take place in what we call uncontrolled contexts, that is, contexts in which we do not have enough knowledge of our audience to predict what the uptake of the utterance will be. Slurs uttered in controlled contexts, by contrast, may lack derogatory character. However, although the kind of context at which the utterance of a slur takes place can make it nonderogatory, it cannot completely deprive it of its harmful potential. Utterances of slurs in controlled contexts still contribute to normalizing their utterances in uncontrolled contexts, which makes nonderogatory occurrences of slurs potentially harmful too.