A5082659010- Magnetic and transport properties of perovskites and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetic Properties and Synthesis of Ferrites
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Iron oxide chemistry and applications
- Nanoparticle-Based Drug Delivery
- Rare-earth and actinide compounds
- Plant and animal studies
- Magnetic properties of thin films
- Gold and Silver Nanoparticles Synthesis and Applications
- Magneto-Optical Properties and Applications
- Advanced MRI Techniques and Applications
- Ecology and Vegetation Dynamics Studies
- Magnetic Properties of Alloys
- Geomagnetism and Paleomagnetism Studies
- Theoretical and Computational Physics
- Thermal Expansion and Ionic Conductivity
- Plant Parasitism and Resistance
- Shape Memory Alloy Transformations
- Nanocluster Synthesis and Applications
- Biosensors and Analytical Detection
- Atomic and Subatomic Physics Research
Czech Academy of Sciences
2012-2024
Institute of Entomology
2018-2024
Czech Academy of Sciences, Biology Centre
2017-2024
University of South Bohemia in České Budějovice
2017-2024
Czech Academy of Sciences, Institute of Physics
2014-2023
University of Kaiserslautern
2023
Fraunhofer Research Institution for Materials Recycling and Resource Strategies IWKS
2019
Technical University of Darmstadt
2019
Charles University
2008-2015
Sewanee: The University of the South
2014
Understanding variation in resource specialization is important for progress on issues that include coevolution, community assembly, ecosystem processes, and the latitudinal gradient of species richness. Herbivorous insects are useful models studying specialization, interaction between plants herbivorous one most common consequential ecological associations planet. However, uncertainty persists regarding fundamental features herbivore diet breadth, including its relationship to latitude...
The half-doped perovskite manganites ${\text{Pr}}_{0.5}{\text{Ca}}_{0.5}{\text{MnO}}_{3}$ and ${\text{La}}_{0.5}{\text{Ca}}_{0.5}{\text{MnO}}_{3}$ in bulk nanocrystalline form were structurally studied by x-ray neutron-diffraction methods. magnetic properties probed dc ac susceptibilities isothermal magnetization measurements. study shows that the room-temperature $Pbnm$ structure, as concerns lattice distortion, Mn-O distances, octahedral tilts, is practically unaffected particle size....
In the quest for suitable materials hyperthermia we explored preparation and properties of nanoparticles Co ferrite. The material was produced by coprecipitation from water solution Fe chlorides afterwards annealed at 400, 600 800 °C. resulting particles were characterized XRD, TEM, Mossbauer spectroscopy, dc ac magnetometry. heating experiments in magnetic fields various amplitudes performed with diluted systems suspended agarose gel results interpreted on basis losses measured...
Nanoparticles of manganese perovskite the composition La0.75Sr0.25MnO3 uniformly coated with silica were prepared by encapsulation magnetic cores (mean crystallite size 24 nm) using tetraethoxysilane followed fractionation. The resulting hybrid particles form a stable suspension in an aqueous environment at physiological pH and possess narrow hydrodynamic distribution. Both calorimetric heating experiments direct measurements hysteresis loops alternating field revealed high specific power...
The structural and magnetic properties of Co1 − xZnxFe2O4 ferrites (Co–Zn ferrites) are investigated in a narrow compositional range around x = 0.6, which is interest because applications fluid hyperthermia. study by x-ray neutron diffraction, Mössbauer spectroscopy magnetization measurements done on nanoparticles prepared the coprecipitation method bulk samples sintered at high temperatures. In spite known preference Zn2 + for tetrahedral (A) sites Co2 octahedral [B] sites, cations...
This study is aimed at the preparation of silica-coated nanoparticles cobalt–zinc ferrite and their heating properties with respect to potential application in magnetic fluid hyperthermia. The cores Co0.4Zn0.6Fe2O4+γ possessing two different sizes were prepared by coprecipitation method followed annealing mechanical treatment. subsequent encapsulation samples silica led colloidally stable suspensions water. single phase character was confirmed x-ray powder diffraction while detailed studies...
Insects tend to feed on related hosts. The phylogenetic composition of host plant communities thus plays a prominent role in determining insect specialization, food web structure, and diversity. Previous studies showed high preference herbivores for congeneric confamilial hosts suggesting that some levels relationships may play more others. We aim quantify the effects phylogeny structure quantitative plant-herbivore webs. Further, we identify specific patterns three guilds with different...
Core-shell nanoparticles consisting of La(0.75)Sr(0.25)MnO(3) cores covered by silica were synthesized a procedure several steps, including the sol-gel method in presence citric acid and ethylene glycol, thermal mechanical treatment, encapsulation employing tetraethoxysilane final separation centrifugation order to get required size fraction. Morphological studies revealed well-separated particles that form stable water suspension. Magnetic include magnetization measurements investigation...
Abstract Aim Insects feeding on seeds and fruits represent interesting study systems, potentially able to lower the fitness of their host plants. In addition true seed eaters, a suite insects feed fleshy parts fruits. We examined likelihood community convergence in whole insect assemblages attacking seeds/fruits three tropical rain forests. Location Three Forest GEO permanent forest plots within different biogeographical regions: Barro Colorado Island (Panama), Khao Chong (Thailand) Wanang...
Research on canopy arthropods has progressed from species inventories to the study of their interactions and networks, enhancing our understanding how hyper-diverse communities are maintained. Previous studies often focused sampling individual tree species, trees or parts. We argue that such selective is not ideal when analyzing interaction network structure, may lead erroneous conclusions. developed practical reproducible guidelines for plot-based analysis arthropod networks in forest...
The present study reveals the potential of magnetic nanoparticles based on La0.75Sr0.25MnO3 perovskite manganite for resonance imaging (MRI). Moreover, it describes development dual probe where cores are combined with a fluorescent moiety while improved colloidal stability is achieved by two-ply silica shell. At first, coated hybrid layer, comprising covalently attached fluorescein that subsequently covered pure layer providing enhanced stability. detailed characterization intermediate and...
Abstract Three magnetic resonance (MR)/fluorescence imaging probes were tested for visualization, cellular distribution, and survival of labeled pancreatic islets in vitro following transplantation. As T 1 contrast agents (CAs), gadolinium(III) complexes linked to β‐cyclodextrin (Gd‐F‐βCD) or bound titanium dioxide (TiO 2 @RhdGd) tested. a CA, perovskite manganite nanoparticles (LSMO@siF@si) examined. Fluorescein rhodamine was incorporated as fluorescent marker all probes. Islets with CAs...