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1
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Optical Absorption of Some Glycine Crystals and their Aqueous Solutions

100%
Koralewski M.
Acta Physica Polonica A
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2003
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vol. 103
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issue 5
459-470
EN
UV absorption spectra of glycine crystals, i.e. triglycine sulphate, selenate, diglycine sulphate as well as their deuterated analogues in solid state and aqueous solutions are given. Results are compared with the electronic transition energies calculated by LCAO INDO method for glycine molecule and ion, assuming their crystal geometry.
2
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Temperature Dependence of the Optical Activity of Pure and Deuterated Rochelle Salt Crystals

64%
Koralewski M., Szafrański M.
Acta Physica Polonica A
|
2002
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vol. 102
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issue 3
409-417
EN
Temperature dependence of the optical rotatory power (ρ) along the optical axis of pure and deuterated Rochelle salt single crystals has been given. Three phases of both crystals were examined and found to be optically active. The relation between spontaneous electrogyration (ρ_s) and spontaneous polarization (P_s) can be described by {ρ_s}∝P_s^2. Moreover, the antipolar domains of pure and deuterated ferroelectric Rochelle salt crystals were found of the rotation twin-type not occurring in the enantiomorphic form, in contrast to those in other ferroelectric crystals, e.g., TGS-type and Pb_5Ge_3O_{11}.
3
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The Effect of Ageing Process on the Electrogyration of Deuterated Triglycine Sulphate Crystals

51%
Koralewski M., Stankowska J., Habryło S.
Acta Physica Polonica A
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2002
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vol. 101
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issue 2
243-248
EN
The paper reports results of a study of optical activity and ferroelectric properties of rejuvenated and aged deuterated triglycine sulphate crystals. A possibility of monitoring of the ferroelectric crystal ageing process by optical measurements was proved. A linear relation between optical rotatory powerρ and spontaneous polarization P_s was confirmed for aged and rejuvenated deuterated triglycine sulphate crystals.
4
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Micro-Raman Spectroscopy of Natural and Synthetic Ferritins and Their Mimetics

51%
Szybowicz M., Koralewski M., Karoń J., Melnikova L.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
534-536
EN
Micro-Raman spectroscopy was used to studies of naturally occurring biogenic ferritin, synthetic ferritin with magnetic core (magnetoferritin) as well as their several mimetics. We demonstrate the ability of micro-Raman spectroscopy to discriminate between ferritin and magnetoferritin used in the studies. The results are promising for further use of the Raman spectroscopy as potential tool to distinguish between the forms of iron present in biogenic materials and biological tissues.
5
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Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb_5Ge_3O_{11}:Ba Crystals

51%
Molak A., Koralewski M., Saunders G., Juszczyk W.
Acta Physica Polonica A
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2005
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vol. 108
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issue 3
513-520
EN
The effect of uniaxial pressure up to 1 kbar applied perpendicular and parallel to c-axis, on the Curie temperature and electric permittivityε_c of Ba-doped Pb_5Ge_3O_{11} single crystals was investigated. The Curie temperature decreases with uniaxial pressure and the coefficientγ_i (γ_i ≡ δ T_{c}/δ X_i) is determined as -7 and -11 K kbar^{-1} for the b- and c-axes, respectively. It was found that uniaxial pressure increases the phase transition diffuseness and the tricritical point cannot be achieved for this pyroelectric and ferroelectric single crystal.
6
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Optical and Magnetooptical Properties of Clinical Dextrans

51%
Koralewski M., Reinholz F., Karoń J., Waraczewski K.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
1119-1124
EN
The effect of dextran concentration, pH, temperature, and urea on the conformation of dextran chain in saline solution were studied. Two characteristic concentrations for both dextrans were observed. One with c_1≈0.02 g/dL and second with c_2∼2 g/dL which may be related with aggregation and overlapping processes of polymer chains, respectively. The mean optical polarizability for dextran polysaccharides were discussed in relation to their radius of gyration. Preliminary results of the Faraday effect dispersion and their temperature dependence is also presented.
7
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Magneto-Optical Study Toward Discrimination of Iron Mineral in Human Tissues

45%
Koralewski M., Żurawski J., Langkammer C., Karoń J., Haybaeck J.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
742-744
EN
Magnetic optical rotatory dispersion (MORD) of thin selected biological tissues and thin film of composite made from akaganeite mineral and PVA as well as ferritin and their mimetics aqueous suspensions were performed in spectral range 250-650 nm at room temperature. Good correlation between MORD spectra for akaganeite composite film, ferritin and their mimetics aqueous suspensions with spectra of thin slices of human tissue obtained from white matter of the brain and spleen were observed. Comparison suggest a contribution from Fe(III) to MORD spectra of tissues. This preliminary results show that application of MORD spectroscopy to clinical analysis may be useful.
8
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Magnetic Birefringence Study of the Magnetic Core Structure of Ferritin

39%
Koralewski M., Pochylski M., Mitróová Z., Melníková L., Kováč J., Timko M., Kopčanský P.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1237-1239
EN
Magnetically induced optical birefringence (Δ n) was measured for magnetoferritin and horse spleen ferritin aqueous suspensions. The Δ n for magnetoferritin was described in the frame of the Langevin formalism taking into account distribution of core diameter. The established average magnetic dipole moment and core diameter is equal to about 460 μ_{B} and 3 nm, respectively. It was shown that magnetic birefringence and the Cotton-Mouton constant can be powerful parameters in identification of the magnetic core structure of ferritin, especially useful in biomedicine.
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