Miroslav Veverka

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Crystal and magnetic structures of the x = 0.2 member of the La0.8-xTbxCa0.2CoO3 perovskite series have been determined from powder neutron diffraction. Enhancement of the diffraction peaks due to ferromagnetic or cluster glass ordering is observed below TC = 55 K. The moments first evolve on Co sites, and ordering of Ising-type Tb(3+) moments is induced at(More)
Core-shell nanoparticles consisting of La(0.75)Sr(0.25)MnO(3) cores covered by silica were synthesized by a procedure consisting of several steps, including the sol-gel method in the presence of citric acid and ethylene glycol, thermal and mechanical treatment, encapsulation employing tetraethoxysilane and final separation by centrifugation in order to get(More)
The effect of aggregation of magnetic nanoparticles on the transverse relaxivity (r<sub>2</sub>) is analyzed with respect to the size of clusters. The nanoparticles employed are based on La<sub>0.75</sub>Sr<sub>0.25</sub>MnO<sub>3</sub> ferromagnetic phase with the mean size of crystallites dXRD = 26 nm synthetized via sol-gel route followed by thermal(More)
Magnetic resonance imaging (MRI) reveals anatomical structures with fascinating details, providing efficient diagnostic tool for medicine and powerful non-invasive method for biological studies in vivo. Specific contrast and labelling agents further enhance MRI applications and the most efficient ones might enable even detection of single cells. However,(More)
3+ ions on the low-temperature magnetism of La, Ca cobaltite. Abstract. Crystal and magnetic structures of the x = 0.2 member of La 0.8−x Tb x Ca 0.2 CoO 3 perovskite series have been determined from the powder neutron diffraction. Enhancement of the diffraction peaks due to ferromagnetic or cluster glass ordering is observed below T C = 55 K. The moments(More)
V. Herynek, E. Pollert, P. Jendelová, O. Kaman, M. Veverka, P. Veverka, E. Syková, and M. Hájek Department of Radiodiagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic, Center for Cell Therapy and Tissue Repair, Second Medical Faculty, Charles University, Prague, Czech Republic, Institute of(More)
Twenty three kojic acid derivatives were tested in the agar diffusion test against twenty five dermatophytic fungi. The inhibitory effects at equal doses (10 mg/L) were correlated with the 1-octanol — water partition coefficients of the compounds. An improvement in antifungal activity can be achieved by increasing the hydrophobicity of the compounds.
Nanoparticles of manganese perovskite of the composition La(0.75)Sr(0.25)MnO(3) uniformly coated with silica were prepared by encapsulation of the magnetic cores (mean crystallite size 24 nm) using tetraethoxysilane followed by fractionation. The resulting hybrid particles form a stable suspension in an aqueous environment at physiological pH and possess a(More)
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