Osm druhů vodních měkkýšů bylo transportováno s rostlinami na korkových rolích ke zpevňování břehů ze severozápadního Polska (Tucholská oblast, povodí Visly) do Prahy při rekonstrukci jedné vodní nádrže. Jiný zajímavý případ představuje zavlečení druhu Bithynia troschelii pravděpodobně s vodními rostlinami do záchranného centra v Botanickém ústavu AV ČR v Třeboni. Přesný původ těchto plžů není znám, ale pravděpodobné se jeví Neziderské jezero v rakousko-maďarském pohraničí, odkud pocházejí některé pěstované rostliny. Pravděpodobně z tohoto zdroje se následně dotyčný vzácný plž dostal i na některá další místa v České republice. and Eight species from a site in the north-western part of Poland (Tuchola region, Wisla/Vistula River Basin) were transported on coir rollers and matting which were used for the stabilisation of the reservoir banks during a water reservoir restoration in Prague. In the other example, Bithynia troschelii was probably transported with aquatic plants to the Institute of Botany, Academy of Sciences of the Czech Republic Třeboň (South Bohemia). The origin of the individuals has not been known out of doubt, but it is possible that they originate from the Neusiedler Lake on the Austrian-Hungarian border since some cultivated plants.
In both embryonal carcinoma (EC) and embryonic stem (ES) cells, the differentiation pathway entered after treatment with retinoic acid (RA) varies as it is based upon different conditions of culture. This study employs mouse EC cells P19 to investigate the effects of serum on RA-induced neural differentiation occurring in a simplified monolayer
culture. Cell morphology and expression of lineage-specific molecular markers document that, while non-neural cell types arise after treatment with RA under serum-containing conditions, in chemically defined serum-free media RA induces massive neural differentiation in concentrations of 10-9 M and higher. Moreover, not only neural (Mash-1) and
neuroectodermal (Pax-6), but also endodermal (GATA-4, α-fetoprotein) genes are expressed at early stages of differentiation driven by RA under serum-free conditions. Furthermore, as determined by the luciferase reporter assay, the presence or absence of the serum does not affect the activity of the retinoic acid response element (RARE). Thus, mouse EC cells are able to produce neural cells upon exposure to RA even without culture in three-dimensional embryoid bodies (EBs). However, in contrast to standard EBs-involving protocol(s), neural differentiation in monolayer
only takes place when complex signaling from serum factors is avoided. This simple and efficient strategy is proposed to serve as a basis for neurodifferentiation studies in vitro.
Autoři prezentují zajímavou kazuistiku týkající se bolesti v orofaciální oblasti. Z uvedeného případu vyplývá složitá diferenciální diagnostika etiologie potíží v této oblasti a dobrý efekt byť jen symptomatické léčby., Authors present an interesting case report concerning a pain in the orofacial area. Complex differential diagnostics of the aetiology of the complaint in this area and a good effect of mere symptomatic treatment result from the said case., and Richard Kaňa, Rastislav Šramko, Alena Polcrová
The article surveys and evaluates various approaches to the logic of indeterminate situations. Two types of such situations are discussed: future contingents and quantum indeterminacy. Approaches differ according to whether they can salvage (i) classical tautologies (such as the law of excluded middle) as logical truths, (ii) bivalence and (iii) truth-functionality. What I call “the first solution” denies bivalence and either saves classical logical truths (supervaluations) or truth-functionality (multi-valued approach), but not both. The so-called “second solution”, saving all aforementioned features, harbors difficulties for the contingency of future contingents and is inapplicable in the quantum realm. Finally, the third solution saves bivalence but, at least in the case of quantum logic, abandons truth-functionality.
In previous studies, it has been shown that recombinant human neuregulin-1(rhNRG-1) is capable of improving the survival rate in animal models of doxorubicin (DOX)-induced cardiomyopathy; however, the underlying mechanism of this phenomenon remains unknown. In this study, the role of rhNRG-1 in attenuating doxorubicin-induce apoptosis is confirmed. Neonatal rat ventricular myocytes (NRVMs) were subjected to various treatments, in order to both induce apoptosis and determine the effects of rhNRG-1 on the process. Activation of apoptosis was determined by observing increases in the protein levels of classic apoptosis markers (including cleaved caspase-3, cytochrome c, Bcl-2, BAX and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick-end labeling (TUNEL) staining). The activation of Akt was detected by means of western blot analysis. The study results showed that doxorubicin increased the number of TUNEL positive cells, as well as the protein levels of cleaved caspase-3 and cytochrome c, and reduced the ratio of Bcl-2/Bax. However, all of these effects were markedly antagonized by pretreament with rhNRG-1. It was then further demonstrated that the effects of rhNRG-1 could be blocked by the phosphoinositole-3-kinase inhibitor LY294002, indicating the involvement of the Akt process in mediating the process. RhNRG-1 is a potent inhibitor of doxorubicin-induced apoptosis, which acts through the PI3K-Akt pathway. RhNRG-1 is a novel therapeutic drug which may be effective in preventing further damage from occurring in DOX-induced damaged myocardium., T. An, ... [et al.]., and Obsahuje seznam literatury
Depression is a complex disorder related to chronic inflammatory processes, chronic stress changes and a hippocampal response. There is a increasing knowledge about the role of glial cells in nutrient supply to neurons, maintenance of synaptic contacts and tissue homeostasis within the CNS. Glial cells, viewed in the past as passive elements with a limited influence on neuronal function, are becoming recognized as active partners of neurons and are starting to be discussed as a possible therapeutic target. Their role in the pathogenesis of depressive disorders is also being reconsidered. Attention is devoted to studies of the different types of antidepressants and their effects on transmembrane signaling, including levels of α subunits of G proteins in C6 glioma cells in vitro as a model of postsynaptic changes in vivo. These models indicate similarities in antidepressant effects on G proteins of brain cells and effector cells of natural immunity, natural killers and granulocytes. Thus, an antidepressant response can exhibit certain common characteristics in functionally different systems which also participate in disease pathogenesis. There are, however, differences in the astrocyte G-protein responses to antidepressant treatment, indicating that antidepressants differ in their effect on glial signalization. Today mainstream approach to neurobiological basis of depressive disorders and other mood illnesses is linked to abnormalities in transmembrane signal transduction via G-protein coupled receptors. Intracellular signalization cascade modulation results in the activation of transcription factors with subsequent increased production of a wide array of products including growth factors and to changes in cellular activity and reactivity., M. Páv, H. Kovářů, A. Fišerová, E. Havrdová, V. Lisá., and Obsahuje bibliografii a bibliografické odkazy
Klíšťové neuroinfekce jsou u dětí se základní onkologickou diagnózou v anamnéze vzácné a cesta ke stanovení diagnózy může být komplikovaná pro podezření na recidivu základního onemocnění. A vice versa, navzdory příznakům pro neuroborreliózu typickým, včetně přisátí klíštěte a údaji o časné lokalizované formě borreliózy – erythema migrans, patří u dětí do diferenciální diagnostiky i nádory CNS., Tick‑borne neuroinfections are rare among children with oncologic diagnosis. Nevertheless, the diagnostic procedure may be more complicated due to suspicion of the relapse of the primary illness. Despite typical symptoms of neuroborreliosis, including tick bite and early localized borreliosis – erythema migrans, tumours of central nervous system have to be taken into account for the differential diagnosis in childhood., and L. Krbková, L. Klapačová, P. Mikolášek, M. Charvátová, I. Červinková, J. Bednářová