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Wyświetlanie 1-10 z 14
Tytuł:
Professor Andrzej Hrynkiewicz (1925-2016)
Autorzy:
Łątka, K.
Powiązania:
https://bibliotekanauki.pl/articles/147237.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Opis:
We all share sorrow over the loss of Professor Andrzej Hrynkiewicz who died on 13th October 2016. For fi ve decades he was the leading authority on nuclear physics, a pioneer of nuclear methods in Poland and a great promotor of the Polish science. The obituary written by professor Kazimierz Łątka contains some recollections concerning the life and the most important works of this distinguished physicist.
Źródło:
Nukleonika; 2017, 62, 2; 71-72
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
155Gd isomer shifts : the case study : GdT2Si2
Autorzy:
Łątka, K.
Powiązania:
https://bibliotekanauki.pl/articles/147398.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
isomer shifts
Mössbauer studies
rare earth ternary compounds
Opis:
The experimentally obtained 155Gd Mössbauer effect results in isomer shifts for GdT2Si2 compounds (where T are transition metals for the 3d, 4d and 5d series) are analysed in terms of charge-transfer effects and s, d redistribution by means of the extended Miedema and van der Woude model. The comparison between the theoretically predicted and measured values is discussed. Although these theoretical predictions of isomer shifts are in reasonable agreement with those found in the experiment, nevertheless they do not follow the experimental dependence on T metal acquired for each nd-series.
Źródło:
Nukleonika; 2013, 58, 1; 23-26
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
119Sn hyperfine interactions in REAuSn (RE = rare earth)
Autorzy:
Łątka, K.
Gurgul, J.
Powiązania:
https://bibliotekanauki.pl/articles/148307.pdf
Data publikacji:
2007
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
antiferromagnetism
Mössbauer studies
rare earth ternary compounds
magnetically ordered materials
Opis:
Intermetallic REAuSn (RE = rare earth elements) compounds were studied by means of X-ray diffraction (XRD), magnetic measurements and 119Sn Mössbauer spectroscopy. It was shown that the majority of them exhibit complex antiferromagnetic ordering at low temperatures. The nature of hyperfine interactions has been discussed based on gamma-ray absorption spectroscopy together with magnetic and structural data. Lanthanide contraction is reflected in the lattice parameters and isomer shifts. Strong experimental arguments support correlation between crystallographic type of structure and magnetic disordering in investigated compounds.
Źródło:
Nukleonika; 2007, 52, supl. 1; 63-66
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interactions between Antitumor Alkylphosphocholines and Membrane Sphingolipids in Langmuir Monolayers
Autorzy:
Wnętrzak, A.
Łątka, K.
Dynarowicz-Łątka, P.
Powiązania:
https://bibliotekanauki.pl/articles/1360518.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.18.-g
Opis:
Alkylphosphocholines (APCs) are new generation, highly selective antineoplastic drugs, whose mechanism of action is not fully understood. It is known that in contrast to traditional chemotherapeutics, APCs do not induce cell death by apoptosis or necrosis as a result of DNA damage, but target cellular membranes and affect their biophysical properties. However, it is still unknown which membrane component attracts APC molecules selectively to cancer cells. In order to get insight into this issue, systematic investigations on the interactions between APCs and particular membrane components are highly required. Such experiments can be performed with the Langmuir monolayer technique, serving as a biomembrane model. Because of overexpression of gangliosides in tumor progression and the ability of APCs to insert into membrane rafts, two sphingolipids, i.e. sphingomyelin (SM) and ganglioside $GM_1$ have been examined as potential membrane targets. In this respect, their interactions with three alkylphosphocholines, differing in their hydrophobic part: hexadecylphosphocholine (HePC), octadecylphosphocholine (OcPC) and erucylphosphocholine (ErPC) have been studied and the following systems have been analysed: SM(or GM1)/HePC, SM(or GM1)/OcPC and SM(or GM1)/ErPC. It was found that all the investigated APCs show strong affinity to ganglioside in contrast to sphingomyelin. Differences in interaction of APCs with both investigated sphingolipids were studied based on experimental surface pressure (π) versus mean molecular area (A) isotherms, and analyzed qualitatively (with mean molecular area values) as well as quantitatively (with Δ $G^{exc}$ function). The obtained results have also been analysed taking into consideration geometry of interacting molecules. Our results suggest that gangliosides may be molecular targets for APCs, attracting them to tumor cells. Although the interactions with sphingomyelin were found to be unfavourable, further studies on more complex system, containing APCs mixed with sphingomyelin and cholesterol, are required to better understand the role of lipid rafts in the selectivity of APCs.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 886-890
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Puzzling Magnetism of $Gd_3Cu_4Sn_4$
Autorzy:
Łątka, K.
Pacyna, A.
Pöttgen, R.
Schappacher, F.
Powiązania:
https://bibliotekanauki.pl/articles/1811579.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
75.30.-m
Opis:
A polycrystalline, single phase sample of $Gd_3Cu_4Sn_4$ ($Gd_3Cu_4Ge_4$ type, Immm, a = 1473.5(1), b = 694.1(1), c = 447.2(1) pm) was synthesized by arc-melting of the elements and subsequent annealing of the sample at 1220 and 970 K, respectively. The magnetic properties of this compound were studied thoroughly by AC and DC magnetic susceptibility measurements and $\text{}^{155}Gd$ Mössbauer spectroscopy. These results reveal two antiferromagnetic phase transitions close to 13 and 8.6 K, respectively. The thermal variation of the magnetic hyperfine fields observed at two inequivalent Gd sites point to two magnetic substructures, which order independently.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1501-1508
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Langmuir Monolayer Characteristics of Erucylphosphocholine - A Novel Anti-Tumor Drug
Autorzy:
Wnętrzak, A.
Łątka, K.
Marzec, M.
Dynarowicz-Łątka, P.
Powiązania:
https://bibliotekanauki.pl/articles/1490116.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.18.-g
Opis:
Erucylphosphocholine, an alkylphosphocholine anticancer drug, was employed for Langmuir monolayer characterization and liquid crystalline studies. Differential scanning calorimetry measurements together with texture observation with polarizing microscope revealed the presence of nematic phase. Film forming properties of erucylphosphocholine at the air/water interface were thoroughly investigated by means of surface pressure-area (π-A) and electric surface potential-area (Δ V-A) isotherms. The influence of such factors as subphase temperature, ionic strength, speed of compression, number of molecules spread at the surface on the characteristics of the π-A isotherms was investigated. Erucylphosphocholine was found to form very stable Langmuir monolayers, which are almost not influenced by experimental conditions. The liquid character of its monolayers was confirmed with both compressibility modulus values and homogeneous Brewster angle microscopy images.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 468-473
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of SmT$\text{}_{2}$Sn$\text{}_{2}$ (T = Ni,Cu) Phases
Autorzy:
Görlich, E. A.
Kmieć, R.
Łątka, K.
Pacyna, A.
Powiązania:
https://bibliotekanauki.pl/articles/1964619.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
72.15.Eb
Opis:
Ternary compounds SmNi$\text{}_{2}$Sn$\text{}_{2}$ and SmCu$\text{}_{2}$Sn$\text{}_{2}$ were investigated with the X-ray diffraction, magnetic susceptibility and electric resistivity methods, as well as using the $\text{}^{119}$Sn Mossbauer effect under the applied magnetic field. Magnetic susceptibilities of these compounds show the Curie-Weiss behaviour in the temperature range from 15 K to 280 K with the enhanced values of the temperature independent term χ$\text{}_{0}$. Both resistivity and magnetic measurements indicate the occurrence of the magnetic ordering in SmCu$\text{}_{2}$Sn$\text{}_{2}$ below T$\text{}_{N}$ = 8 K. The Mossbauer investigations carried out at 4.2 K under an applied magnetic field of up 6 T indicate a more complex magnetic structure and a considerable anisotropy. SmNi$\text{}_{2}$Sn$\text{}_{2}$ remains paramagnetic down to 5 K.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 319-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heat capacity and Mössbauer data for LuZnSn2 compound
Autorzy:
Łątka, K.
Przewoźnik, J.
Żukrowski, J.
Verbovytskyy, Y.
Gonçalves, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/147720.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
heat capacity
Mössbauer studies
rare earth ternary compounds
Opis:
New analysis of heat capacity data is presented for LuZnSn2 compound that takes into account anharmonic effects together with the existence of Einstein modes. 119mSn Mössbauer spectroscopy was used to monitor the hyperfi ne parameters at the two crystallographically inequivalent Sn sites in the studied compound. The problem of non-unique mathematical resonance spectrum description and the problem how to choose physically meaningful set of hyperfi ne parameters will be thoroughly discussed. Measured quadrupole interaction constants by 119mSn Mössbauer spectroscopy give estimations for Vzz component of electric fi eld gradient tensor at both Sn sites in LuZnSn2.
Źródło:
Nukleonika; 2015, 60, 1; 97-101
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mössbauer and heat capacity studies of ErZnSn2
Autorzy:
Łątka, K.
Przewoźnik, J.
Żukrowski, J.
Verbovytskyy, Y.
Gonçalves, A. P.
Powiązania:
https://bibliotekanauki.pl/articles/146874.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ternary rare-earth intermetallics
heat capacity
Mössbauer spectroscopy
Opis:
Heat capacity results obtained for the intermetallic compound ErZnSn2 were re-analysed to also consider, apart from the classical Debye model, the anharmonicity of the crystal lattice and the proper set of Einstein modes. The 119mSn Mössbauer technique was applied to derive the hyperfine interaction parameters characteristic of the two inequivalent crystallographic Sn sites in the compound studied. Quadrupole interaction constants, as measured by 119mSn Mössbauer spectroscopy, allowed for estimations of Vzz components of the electric field gradient tensor that exist at both Sn sites in the discussed compound.
Źródło:
Nukleonika; 2017, 62, 2; 129-133
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exotic phase transitions in RERhSn compounds
Autorzy:
Łątka, K.
Kmieć, R.
Kruk, R.
Pacyna, A.
Rams, M.
Schmidt, T.
Pöttgen, R.
Powiązania:
https://bibliotekanauki.pl/articles/148856.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
magnetic properties
phase transitions
Mössbauer spectroscopy
Opis:
Crystal and magnetic properties of three equiatomic ternary RERhSn compounds (where RE = Ce, Nd, Gd) have been studied by means of X-ray diffraction, ac, and dc magnetic susceptibility measurements, as well as using Mössbauer spectroscopy with 119Sn and 155Gd resonances. CeRhSn does not order magnetically down to 2 K while NdRhSn undergoes ferromagnetic transition at TC = 10.3 K and GdRhSn orders antiferromagnetically below TN = 16 K. Our CeRhSn and NdRhSn samples become superconductive below 6.5 K and 6.9 K, respectively.
Źródło:
Nukleonika; 2003, 48,suppl.1; 35-40
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 14

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