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8702. Results of two-years' seismo-hydrological monitoring in the area of the Hronov-Poříčí Fault Zone, Western Sudetes
- Creator:
- Stejskal, Vladimír, Skalský, Lumír, and Kašpárek, Ladislav
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, zemětřesení, podzemní vody, earthquake, groundwaters, seismic activity, Hronov-Poříčí Fault Zone, earthquake precursors, crustal deformation, Earth tides, 7, and 551
- Language:
- English
- Description:
- We present first results of the study of possible relations between the seismic activity and crustal fluids (groundwater an d carbon dioxide) in the area of the Hronov-Poříčí Fault Zone (HPFZ), situated on the NE margin of the Bohemian Massif. Local seismic monitoring and observations of groundwater levels in deep wells and concentrations of carbon-dioxide in the mineral spring at Třtice was started in 2005. Since then, more than 30 local seismic events were observed in the area of the HPFZ. The two strongest earthquakes with macroseismic effects were recorded on August 10, 2005 (M = 2.4) and October 25, 2005 (M = 3.3). Most of the epicentres were situated along the central part of the HPFZ. Only some weak events from February and March 2006 were concentrated along the SE termination of the HPFZ. Results of the hydrological monitoring show that water level fluctuations are affected mainly by the precipitation, snow-melt, air pressure changes, and tidal deformations of the Earth’s crust. The effects of seismo-tectonic activity were detected only in one out of five water wells, where we observed several step-like water level anomalies with amplitudes of 4 to 15 cm. Two of them preceded the August 10, 2005 and October 25, 2005 earthquakes. Three other anomalies seemed to originate independently of the seismic activity. We therefore suppose that they were induced by aseismic movements along the HPFZ. Contrary to the water level fluctuations, CO2 concentrations in the mineral spring seem to be dependent on water temperature; no evident seismic-induced changes have been observed yet., Vladimír Stejskal, Lumír Skalský and Ladislav Kašpárek., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
8703. Results on $F$-continuous graphs
- Creator:
- Draganova, Anna
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- continuous, $F$-continuous, $F$-regular, and regular graph
- Language:
- English
- Description:
- For any nontrivial connected graph $F$ and any graph $G$, the {\it $F$-degree} of a vertex $v$ in $G$ is the number of copies of $F$ in $G$ containing $v$. $G$ is called {\it $F$-continuous} if and only if the $F$-degrees of any two adjacent vertices in $G$ differ by at most 1; $G$ is {\it $F$-regular} if the $F$-degrees of all vertices in $G$ are the same. This paper classifies all $P_4$-continuous graphs with girth greater than 3. We show that for any nontrivial connected graph $F$ other than the star $K_{1,k}$, $k \geq 1$, there exists a regular graph that is not $F$-continuous. If $F$ is 2-connected, then there exists a regular $F$-continuous graph that is not $F$-regular.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
8704. Results on the integrity of double star graphs
- Creator:
- Dündar, Pinar
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- network topologies, communication networks, graph theory, network connectivity, and network stability and reliability
- Language:
- English
- Description:
- A network begnis losing nodes or liriks, or there inay be a loss in its effectiveness. Thus, the communication network must be constructed to be as stable as possible, not only with respect to the initial disruption, but also with respect to the possible reconstruction of the network. Stability numbers of a communication network measure its durability with respect to a break down. If we consider a graph as modelling of a communication network, connectivity is an important measure of reliability or stability of a graph, but not enough. Integrity is a new measurement of stability. It takes into consideration the number of vertices of the remaining cornponents after some disruption. Also the edge-integrity is defined. In this paper, we study integrity (or vertex-integrity) and edge-integrity of Double Star Graphs and some of its cornpounds.
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
8705. Resveratrol alleviates ethanol-induced hormonal and metabolic disturbances in the rat
- Creator:
- Szkudelska, K., Deniziak, M., Roś, P., Gwóźdź, K., and Szkudelski, T.
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, ethanol, hormony, metabolismus, hormones, metabolism, resveratrol, rats, 14, and 612
- Language:
- English
- Description:
- Resveratrol is a polyphenol found in different plant species and having numerous health-promoting properties in animals and humans. However, its protective action against deleterious effects of ethanol is poo rly elucidated. In the present study, the influence of resveratrol (10 mg/kg/day) on some hormones and metabolic parameters was determined in rats ingesting 10 % ethanol solution for two weeks. Blood levels of insulin, glucagon and adiponectin were affecte d by ethanol, however, resveratrol partially ameliorated these changes. Moreover, in ethanol drinking rats, liver lipid accumulation was increased, whereas resveratrol was capable of reducing liver lipid content, probably due to decrease in fatty acid synt hesis. Resveratrol decreased also blood levels of triglycerides and free fatty acids and reduced γ-glutamyl transferase activity in animals ingesting ethanol. These results show that resveratrol, already at low dose, alleviates hormonal and metabolic changes induced by ethanol in the rat and may be useful in preventing and treating some consequences o f alcohol consumption., K. Szkudelska, M. Deniziak, P. Roś, K. Gwóźdź, T. Szkudelski., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
8706. Rethinking the Islamic hijra: a religious paradigm or an ideological instrument of political action
- Creator:
- Mendel, Miloš
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- hijra, Islam, Exodus, religious movements, and Arabian peninsula
- Language:
- English
- Description:
- The article examines the phenomenon that occurs in three monotheistic religions - Judaism, Christianity and Islam - and which has been constantly referred to in the European tradition under the Greco-Latin term, Exodus. The Islamic variant of it (in Arabic, hijra - emigration, or originally and more precisely, cutting kin and tribal (ties) is briefly defined and put into the broader historical context. At the same time the article comprises partial information and critical remarks on the state of the research in relation to the issue of Islamic hijra, including a list of bibliographic data, based on the collection of relatively representative samples of sources and studies. The contribution also includes a preliminary survey of typified cases of hijra-style events n the course of the history of Islamic countries, as well as a concrete example of how this "archaic" religious pattern functions, if utilized as an ideological framework of a particular politcal process. The relevance of the phenomenon for modern and contemporary history is demonstrated through reference to the sedentarization of Bedouin tribes during the Ikhwan movement in the Arabian peninsula (1912-30).
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
8707. Retinoic acid attenuates the mild hyperoxic lung injury in newborn mice
- Creator:
- Madgalena Herknerová, Jaromír Mysliveček, and Petr Potměšil
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Patologie. Klinická medicína, fyziologie, hyperoxie, plíce, physiology, hyperoxia, lungs, retinoic acid, vascular endothelial growth factor, lung injury, newborn mice, 14, and 616
- Language:
- English
- Description:
- Neonatal exposure to hyperoxia alters lung development in mice. We tested if retinoic acid (RA) treatment is capable to affect lung development after hyperoxic injury and to maintain structural integrity of lung. The gene of vascular endothelial growth factor A (VEGF-A) is one of the RA-responsive genes. Newborn BALB/c mice were exposed to room air, 40 % or 80 % hyperoxia for 7 days. One half of animals in each group received 500 mg/kg retinoic acid from day 3 to day 7 of the experiment. At the end of experiment we assessed body weight (BW), lung wet weight (LW), the wet-to-dry lung weight ratio (W/D) and the expression of mRNA for VEGF-A and G3PDH genes. On day 7 the hyperoxia-exposed sham-treated mice (group 80) weighed 20 % less than the room air-exposed group, whereas the 80 % hyperoxic group treated with RA weighed only 13 % less than the normoxic group. W/D values in 80 and 80A groups did not differ, although they both differed from the control group and from 40 groups. There was a significant difference between 40 and 40A groups, but the control group was different from 40 group but not from 40A groups. The 80 and 80A groups had mRNA VEGF-A expression lowered to 64 % and 41 % of the control group. RA treatment of normoxic and mild hyperoxic groups increased mRNA VEGF-A expression by about 50 %. We conclude that the retinoic acid treatment of newborn BALB/c mice exposed for 7 days to 80 % hyperoxia reduced the growth retardation in the 80 % hyperoxic group, reduced the W/D ratio in the 40 % but not in the 80 % hyperoxic group. Higher VEGF-A mRNA expression in the 80 % hyperoxic group treated with RA was not significant compared to the 80 % hyperoxic group., M. Zimová-Herknerová, J. Mysliveček, P. Potměšil., and Obsahuje bibliografii a bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
8708. Retinol-binding protein 4 expression in visceral and subcutaneous fat in human obesity
- Creator:
- Magda Bajzová, Michaela Kováčiková, Michaela Šiklová, Eva Klimčáková, Jan Polák, Zuzana Kováčová, Viguerie, N., Tomáš Vedral, Lubomír Mikulášek, Petra Šrámková, Antonín Srp, Jindra Hejnová, Langin, D., and Vladimír Štich
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Biochemie. Molekulární biologie. Biofyzika, fyziologie člověka, obezita, inzulinová rezistence, human physiology, obesity, insulin resistance, visceral and subcutaneous adipose tissue, retinol-binding protein 4, 2, and 577
- Language:
- English
- Description:
- Retinol binding protein 4 (RBP4) is a novel adipokine which might be involved in the development of insulin resistance. The aim of the study was to investigate the expression of RBP4 mRNA in subcutaneous and visceral fat depots and the relationship between RBP4 plasma and mRNA levels relative to indices of adiposity and insulin resistance. In 59 Caucasian women (BMI 20 to 49 kg/m2 ) paired samples of subcutaneous and visceral fat were obtained for RBP4, leptin and GLUT 4 mRNA analysis using reverse transcription-quantitative PCR. Euglycemic hyperinsulinemic clamp and computed tomography scans were performed. RBP4 mRNA levels as well as GLUT 4 mRNA and leptin mRNA levels were lower (P<0.001, P<0.01 and P<0.001, respectively) in visceral compared to subcutaneous fat. No differences were found in RBP4 mRNA expression in the two fat depots or in RBP4 plasma levels between subgroups of non-obese subjects (n=26), obese subjects without metabolic syndrome (n=17) and with metabolic syndrome (n=16). No correlations between RBP4 mRNA or plasma levels relative to adiposity, glucose disposal rate and GLUT 4 mRNA expression in adipose tissue were found. There was a weak positive correlation between plasma RBP4 and plasma triglycerides (r = 0.30, p<0.05) and between plasma RBP4 and blood glucose (r = 0.26, p<0.05). Regardless of the state of adiposity or insulin resistance, RBP4 expression in humans was lower in visceral than in subcutaneous fat. We found no direct relationship between either RBP4 mRNA or its plasma levels and the adiposity or insulin resistance. and Obsahuje bibliografii a bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
8709. Retract irreducibility of monounary algebras
- Creator:
- Jakubíková-Studenovská, Danica
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- math and monounary algebras
- Language:
- English
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
8710. Reverse transport of cholesterol is the reason for resistance to development of atherosclerosis in Prague Hereditary Hypercholesterolemic (PHHC) rat
- Creator:
- Schmiedtova, M., Marie Heczková, Kovar, J., Kralova Lesna, I., and Rudolf Poledne
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, ateroskleróza, cholesterol, atherosclerosis, macrophages, 14, and 612
- Language:
- English
- Description:
- The Prague Hereditary Hypercholesterolemic (PHHC) rat is a model of hypercholesterolemia. In previous experiments, it was found to be completely resistant to the development of atherosclerosis. It was assumed that the reverse transport of cholesterol (RCT) might be the reason for this resistance. In this study, RCT was measured in vivo by cholesterol efflux from macrophages to plasma, using previously established methods for RCT in mice (Rader 2003), optimized for measurements in rats. Primary cell culture of macrophages was labeled with 14Ccholesterol and then injected intraperitoneally into rats. Plasma and feces were collected at 24 and 48 h. The plasma 14Ccholesterol levels at both 24 and 48 h were significantly higher in male PHHC rats compared to control Wistar rats. The PHHC rats excreted less 14C-cholesterol in feces in 24 and 48 h compared to Wistar rats. The largest pool of 14C-cholesterol was found in the adipose tissue of PHHC rats and in contrast lower levels of 14Ccholesterol were measured in the liver and muscle tissues of PHHC rats compared with Wistar rats. Increasing release of 14Ccholesterol efflux from macrophages demonstrates accelerated RTC and leads to prevention of atherogenesis in PHHC rats., M. Schmiedtova, M. Heczkova, J. Kovar, I. Kralova Lesna, R. Poledne., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public