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EN
The paramecium strain, originating from Japan, Yamaguchi, belongs to Paramecium jenningsi (type of micronuclei, appearance of autogamy, presence of two macronuclear anlagen, dimensions of cells, and the RAPD fingerprints). The finding of Paramecium jenningsi in Japan enlarges the range of the species believed to be limited to a warm or even tropical climate.
EN
The first stand of Paramecium octaurelia in Europe (Germany) is described and interesting intra-specific polymorphism is compared within the species using strains originating from different continents (Europe, N. America and Asia). Sequenced fragments of 5. LSU rDNA and COI mtDNA revealed that the studied strains form two groups, one with strains from Germany and USA, and a second group from Israel.
EN
The electrical conductivity, resonance frequency and piezoelectric strain constants are determined for ordered piezoelectric Ca₃TaGa₃Si₂O₁₄ (CTGS) single crystals from room temperature to 900°C. The latter result from three independent methods, namely resonant, ultrasonic pulse-echo, and laser Doppler vibrometry techniques, which allows validating the results. Further, the long-term behaviour of fundamental materials properties including electrical conductivity and resonance frequency are examined at 1000°C for CTGS crystals, grown by different manufacturers. After an initial period of about 500 h, the conductivity is found to remain nearly constant for at least 1500 h. In a period of 2000-5000 h a decrease of conductivity by only 20% is observed. The resonance frequency is found to decrease almost linearly in a period of 500-5000 h for all investigated samples.
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