K. P. Tiras

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The effect of retinoic acid on regeneration of two species of asexual planarian races, Girardia tigrina and Schmidtea mediterranea, was studied. It was established that retinoic acids at physiological concentrations (10−7–10−10 M) inhibit the regeneration of the head part of planarians but have no effect on tail blastema growth. It is shown that(More)
We studied asexual reproduction of planarians under the natural and artificial photoperiodic conditions. It was shown that light inhibits the fission of planarians, while darkness stimulates it. The diurnal dynamics of the fission of planarians demonstrated a circadian rhythm. This rhythm is stable, which is expressed when the conditions are experimentally(More)
The melatonin effect on the anterior and posterior ends of a free-living flatworm Girardia tigrina was studied, as well as the variability of the mitotic activity of the stem cells (neoblasts) in the anterior and posterior postblasteme. This hormone may inhibit the regeneration of the anterior end of the animal in the physiologic-friendly concentrations of(More)
127 The term " weak magnetic field " is used to denote the magnetic fields that are comparable in amplitude with the geomagnetic field, i.e., the fields with the magnetic induction values on the order of 5 × 10 –6 T. The effect of weak combined (static and alternating) magnetic fields (CMF) tuned to the parametric resoo nance for metal cations was first(More)
A software for processing sets of full-color images of biological tissue histological sections is developed. We used histological sections obtained by the method of high-precision layer-by-layer grinding of frozen biological tissues. The software allows restoring the image of the tissue for an arbitrary cross-section of the tissue sample. Thus, our method(More)
The positional differences in the regenerative capability of individual body parts of the planarian Girardia (Dugesia) tigrina were analyzed. The paper shows the significance of the size and positional differences of individual fragments of planarians for their regenerative capabilities, as well as the fundamental difference in the mechanisms of the head(More)
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