Publications by authors named "Zikmund T"

Prismatic lithium-ion batteries (LIBs) are considered promising electric energy sources in electromobility applications due to their efficient space utilization. However, their sensitivity to external and internal influences and reduced durability lead to inflation risk and potential explosions throughout their lifecycle. These critical processes are strongly influenced by the inner construction of the cell, especially concerning the coating and mechanical fixation.

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People are exposed to microplastics (MPs) on a large scale in everyday life. However, it is not clear whether MPs can also be distributed and retained in certain tissues. Therefore, the development of analytical methods capable of detecting MPs in specific human organs/tissues is of utmost importance.

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Consensus holds that pottery technology came to Central Europe from the Northern Balkans with independent pottery traditions existing concurrently in Eastern Europe. An unusual grass-tempered pottery dating back to around 5800 cal BC found in lake sediments at Santovka, Slovakia, predated the earliest known Neolithic pottery in the region (~ 5500 cal BC), suggesting unexplored narratives of pottery introduction. Analyses of the pottery's technology, origin, and grass temper shedding light on ceramic traditions' spread can unveil mobility patterns and community lifestyles.

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  • Mammals have different types of teeth (heterodonty) with simpler teeth in the front and more complex ones in the back, and this study looks at the genes involved in their early development.
  • Researchers analyzed gene expression patterns in the lower jaw of mice at two early development stages, finding significant differences in signaling molecules (like BMP and FGF) between the front and back regions of the jaw.
  • The study highlights the role of the SATB2 gene in developing incisor teeth and its surprising expression near molars, indicating that gene functions can vary significantly depending on the jaw's location.
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  • This study focuses on Xenopus laevis, an important model organism in developmental biology, specifically regarding its late developmental stages, which are often underrepresented in research.
  • Researchers used micro-computed tomography (micro-CT) to create detailed 3D models of Xenopus at various stages from tadpoles to adults, highlighting morphological changes and structures such as the skeleton, teeth, and organs.
  • The resulting high-resolution dataset is a valuable resource for future studies in vertebrate development, with potential applications in virtual reality, 3D printing, and educational initiatives.
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The chondrocranium provides the key initial support for the fetal brain, jaws and cranial sensory organs in all vertebrates. The patterns of shaping and growth of the chondrocranium set up species-specific development of the entire craniofacial complex. The 3D development of chondrocranium have been studied primarily in animal model organisms, such as mice or zebrafish.

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  • - The study investigates how craniofacial skeletal structures develop and how understanding this could improve treatments for congenital malformations through genome-wide RNA transcription analysis from human embryonic facial mesenchyme.
  • - Researchers identified active regulatory elements linked to the PI3/AKT/mTORC1/autophagy pathway and tested its role in craniofacial development using genetic and pharmacological methods in mice and zebrafish.
  • - Findings suggest that mTORC1 signaling influences craniofacial formation in response to environmental factors, particularly nutrition, highlighting its potential role in facial shape variations and developmental plasticity.
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  • The study explores the role of SMARCA5 (SNF2H) in the development of hematopoietic cells, highlighting its importance for proper embryonic and organ development in mice.
  • Mouse models show that a reduced expression (hypomorphic allele) of SMARCA5 can rescue defects in hematopoiesis and lethality caused by its complete deletion in specific hematopoietic progenitor cells.
  • Results indicate that while low SMARCA5 levels allow normal embryonic development, they disrupt lymphoid lineage entry and differentiation in hematopoietic stem cells, whereas myeloid lineage development remains largely unaffected.
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The Hindbrain Choroid Plexus is a complex, cerebrospinal fluid-secreting tissue that projects into the 4th vertebrate brain ventricle. Despite its irreplaceability in the development and homeostasis of the entire central nervous system, the research of Hindbrain Choroid Plexus and other Choroid Plexuses has been neglected by neuroscientists for decades. One of the obstacles is the lack of tools that describe the complex shape of the Hindbrain Choroid Plexus in the context of brain ventricles.

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Primary cilia are cellular surface projections enriched in receptors and signaling molecules, acting as signaling hubs that respond to stimuli. Malfunctions in primary cilia have been linked to human diseases, including retinopathies and ocular defects. Here, we focus on TMEM107, a protein localized to the transition zone of primary cilia.

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Mineralized tissues, such as bones or teeth, are essential structures of all vertebrates. They enable rapid movement, protection, and food processing, in addition to providing physiological functions. Although the development, regeneration, and pathogenesis of teeth and bones have been intensely studied, there is currently no tool to accurately follow the dynamics of growth and healing of these vital tissues in space and time.

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In this study we use comparative genomics to uncover a gene with uncharacterized function (1700011H14Rik/C14orf105/CCDC198), which we hereby name FAME (Factor Associated with Metabolism and Energy). We observe that FAME shows an unusually high evolutionary divergence in birds and mammals. Through the comparison of single nucleotide polymorphisms, we identify gene flow of FAME from Neandertals into modern humans.

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Formation of oriented myofibrils is a key event in musculoskeletal development. However, the mechanisms that drive myocyte orientation and fusion to control muscle directionality in adults remain enigmatic. Here, we demonstrate that the developing skeleton instructs the directional outgrowth of skeletal muscle and other soft tissues during limb and facial morphogenesis in zebrafish and mouse.

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We report on the formation of silver nanoparticles by gas aggregation in a reaction chamber at room temperature. The size distribution of nanoparticles deposited on a silicon substrate for various lengths of an aggregation (high-pressure) chamber was investigated by atomic force microscopy. Nanoparticles were characterized by scanning and transmission electron microscopy and spectral ellipsometry.

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  • - The comet assay is a flexible method used to identify DNA damage in individual eukaryotic cells, applicable to various species from yeast to humans, detecting issues like DNA strand breaks and other forms of damage.
  • - Modifications to the protocol are necessary based on the specimen to minimize additional DNA damage during sample processing and to enhance the detection of damage differences.
  • - The method has been validated for various applications in research and has gained recognition as an in vivo genotoxicity test by the OECD, with guidelines provided for its use across different cell types and DNA damage assessments.
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Cross-section preparation of painting micro-samples is part of their routine analysis. This type of preparation can be used for several analytical techniques, such as scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, and optical microscopy. These techniques offer high-resolution imaging and/or elemental information, providing access to technical and material data important for the interpretation, preservation, and restoration of painted artworks.

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Scanning electron microscopy (SEM) is a common method for the analysis of painting micro-samples. The high resolution of this technique offers precise surface analysis and can be coupled with an energy-dispersive spectrometer for the acquisition of the elemental composition. For light microscopy and SEM analysis, the painting micro-samples are commonly prepared as cross-sections, where the micro-sample positioned on the side is embedded in a resin.

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There are major differences in duration and scale at which limb development and regeneration proceed, raising the question to what extent regeneration is a recapitulation of development. We address this by analyzing skeletal elements using a combination of micro-CT imaging, molecular profiling and clonal cell tracing. We find that, in contrast to development, regenerative skeletal growth is accomplished based entirely on cartilage expansion prior to ossification, not limiting the transversal cartilage expansion and resulting in bulkier skeletal parts.

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  • Spontaneous bleeds are a major cause of mortality in children with Alagille syndrome (ALGS), particularly affecting girls more than boys, as shown by a systematic review of vascular events.
  • Research using Jag1 mouse models revealed they experienced vascular abnormalities, including brain bleeds and blood vessel issues, which could exacerbate with high blood pressure.
  • Retinography was found to be an effective non-invasive tool for examining vascular characteristics in ALGS patients, highlighting significant sex differences in vascular conditions in this disorder.
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Characterization of brain infarct lesions in rodent models of stroke is crucial to assess stroke pathophysiology and therapy outcome. Until recently, the analysis of brain lesions was performed using two techniques: (1) histological methods, such as TTC (Triphenyltetrazolium chloride), a time-consuming and inaccurate process; or (2) MRI imaging, a faster, 3D imaging method, that comes at a high cost. In the last decade, high-resolution micro-CT for 3D sample analysis turned into a simple, fast, and cheaper solution.

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Adrenal glands are the major organs releasing catecholamines and regulating our stress response. The mechanisms balancing generation of adrenergic chromaffin cells and protecting against neuroblastoma tumors are still enigmatic. Here we revealed that serotonin (5HT) controls the numbers of chromaffin cells by acting upon their immediate progenitor "bridge" cells via 5-hydroxytryptamine receptor 3A (HTR3A), and the aggressive HTR3A human neuroblastoma cell lines reduce proliferation in response to HTR3A-specific agonists.

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The complex shape of embryonic cartilage represents a true challenge for phenotyping and basic understanding of skeletal development. X-ray computed microtomography (μCT) enables inspecting relevant tissues in all three dimensions; however, most 3D models are still created by manual segmentation, which is a time-consuming and tedious task. In this work, we utilised a convolutional neural network (CNN) to automatically segment the most complex cartilaginous system represented by the developing nasal capsule.

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