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Anomalous Dielectric Spectra of Ferro- and Ferrielectric Liquid Crystalline Phase in MHPNBC

100%
Dubois F., Douali R., Wawrzyniak A., Legrand C., Ropa P., Wróbel S., Dąbrowski R.
Acta Physica Polonica A
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2013
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vol. 124
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issue 6
937-939
EN
MHPOBC analogue with long achiral alkyl chain has been investigated by dielectric spectroscopy studies in the wide temperature range. Low frequency dielectric spectroscopy revealed the existence of normal ferroelectric phase (in a narrow gap), two ferri- and three antiferroelectric phases in addition to paraelectric phase and alpha sub-phase. The compound studied shows exceptionally strong dependence of the dielectric permittivities on measuring electric field in the temperature range of ferro- and ferrielectric phases.
2
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The effect of obesity on the bone morphometry and histomorphometry in male and female Wistar rats

100%
Wolski D., Wawrzyniak A., Bieńko M., Michalik J., Radzki R. P., Arciszewski M. B.
Polish Journal of Veterinary Sciences
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2018
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vol. 21
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issue 3
3
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Immunoreactivity for calretininin interneurons of the hippocampal CA1 field and dentate gyrus in adult rats after administration of habanero peppers (Capsicum chinense Jacq.)

100%
Jaworska-Adamu J., Krawczyk A., Rycerz K., Gołyński M., Wawrzyniak A., Lutnicki K., Balicki I.
Polish Journal of Veterinary Sciences
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2018
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vol. 21
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issue 3
4
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Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy

68%
Wawrzyniak A., Chruściel J., Douali R., Dubois F., Leblond J., Legrand C., Ossowska-Chruściel D., Marzec M., Ropa P., Czerwiec J., Wróbel S.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 6
933-936
EN
(S)-(+)-4'-[(4-(1-methylheptyloxycarbonylphenyl) thiocarbonylphenyl]-decyloxybenzoate (in short 10.OPOSMH) was studied by complementary methods. The substance shows rich polymorphism. In addition to ferroelectric and antiferroelectric smectic C* phases it possesses three ferrielectric sub-phases. Phase transitions between the phases were revealed by differential scanning calorimetry and static dielectric permittivity measurements. The aim of this paper was to study phase transitions and differences in dielectric spectra shown by different phases. Collective and molecular dynamics of all phases shown by 10.OPOSMH will be discussed in terms of theoretical models. Dielectric spectra of antiferroelectric phase show two characteristic dielectric relaxation modes: one connected with the molecular process (reorientation around the short axis) and the other originating from fluctuations of antiferroelectric order parameters.
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