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1

Astereological analysis of FRTL-5 cells as an effect of thyrotropin and irradiation

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Stiblar-Martincic D., Cor A., Pajer Z.
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issue 3-4
173-177
EN
FRTL-5 cell line is a cloned epithelial follicular cell line from Fischer rat thyroids. This cell line expresses many of the thyroid differentiated markers in vitro. Their growth and function depend on thyrotropin (TSH) as the main regulatory hormone. In this astereological analysis, the authors concentrate on FRTL-5 nuclei as the most vulnerable part of the cell. Using morphometrical variables, they wished to discover the morphologically identifiable sign of transformation of FRTL-5 cells after irradiation and to study the effect of different TSH concentrations. FRTL-5 cells were grown in a medium of 4 different concentrations of TSH (0, 0.1, 1, 10 mU/ml) and irradiated with 0 Gy, 2 Gy, and 4 Gy. The results showed that the nuclear-cytoplasmic ratio decreases after irradiation with doses of 4 Gy or if TSH was included in the medium. The nuclear maximum diameter of FRTL-5 cells increased with higher concentrations of TSH more obviously after irradiation with 4 Gy than with 2 Gy. On the basis of astereological analysis, it was concluded that different concentrations of TSH and irradiation exert an effect especially upon FRTL-5 cell nuclei. The possible transformation of FRTL-5 cells after culturing in TSH medium and after irradiation could be confirmed by injection into an animal of the Fischer strain.
2
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Changes of the acoustic startle reflex in rats with radiation-induced hippocampal lesion

100%
Blaszczyk J. W., Walasek G., Woznicka A., Seress L.
Acta Neurobiologiae Experimentalis
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1999
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vol. 59
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issue 3
171-176
EN
The main question of the study was: to what extent does a neonatal radiation-induced hippocampal lesion lead to emotional changes in adulthood? Acoustic startle response (ASR) was studied in two groups of adult rats. The rats from the first group (14 animals) were exposed to neonatal x-ray irradiation. Their ASR were compared with those from the 10 intact rats that formed a control group. The ASR was tested during two sessions with different illumination of the acoustic chamber. During the first session the rats were tested in the darkness while during the second test the acoustic chamber was illuminated with a 15 W bulb. Irradiation resulted in a significant reduction of granule cells of the hippocampus (about 55%). The lesion resulted in emotional and behavioral changes evidenced by modification of the ASR. The irradiated rats exhibited a significantly increased amplitude of the startle response. In contrast to the light condition, the darkness context caused a decline of the ASR amplitude in the control group and failed to elicit significant changes in the lesioned animals. The results support the hypothesis that hippocampal lesions disrupt motor inhibition.
3

Short-term fluctuations of chlorophyll alpha fluorescence versus diurnal variations of solar radiation in the surface water of the Gdansk Basin

100%
Magulski R., Falkowska L., Dunajska D., Pryputniewicz D., Sikorowicz S.
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2004
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issue 3
57-68
EN
Measurements of chlorophyll alpha fluorescence accompanied by solar radiation measurements were carried out during two spring cruises in the region of the Gdansk Basin. Chlorophyll alpha fluorescence, similarly to that of chlorophyll alpha concentration in the seawater, showed considerable diurnal variability. The measurements provided statistically significant negative correlation coefficients that indicated that chlorophyll a fluorescence is inhibited as solar PAR and UV radiation intensity increases. The approximate range of radiation intensity that corresponded to a clearly marked decline in chlorophyll a fluorescence and chlorophyll alpha concentration was determined. It was revealed that the decline in chlorophyll alpha concentration in the surface water layer resulted from the photodegradation of chlorophyll alpha as well as phytoplankton grazing. In both cases, the resulting observation was an increase of pheophytine a concentration. The vertical migration of phytoplankton was identified as an additional process induced by high radiation levels.
4

Meiotic chromosomal variation resulting from irradiation of pollen in maize

100%
Viccini L. V., de_ C. R., Viccini C. L. V.
Journal of Applied Genetics
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2002
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vol. 43
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issue 4
463-469
EN
The objective of this study was to standardize an induction strategy of chromosome aberrations in maize inbred line L-869. Pollen grains irradiated with 0, 36 and 72 Gy were used for fertilization. Resulting seeds were planted in a greenhouse to assess the number of abnormal meiotic cells. Germination, height, sterility and mortality were verified. Cells with delayed separation of chromosomes, translocation, deficiency, abnormal pairing, later condensation and anaphase bridges were observed. The number of abnormalities increased as the dosage increased but chromosome aberration types were the same regardless of the dosages used. Various chromosome-altered plants were obtained without viability loss.
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