Number of results to display per page
Search Results
33002. Rheological properties of Latvian illite clays
- Creator:
- Dusenkova, Inga, Stepanova, Valentina, Vecstaudza, Jana, Lakevics, Vitalijs, Malers, Juris, and Berzina-Cimdina, Liga
- Format:
- print, bez média, and svazek
- Type:
- article, články, model:article, and TEXT
- Subject:
- Geologie. Meteorologie. Klimatologie, jílové minerály, plasticita, clay minerals, plasticity, illite, apparent viscosity, mineralogical composition, electrical conductivity, 7, and 551
- Language:
- English
- Description:
- The influence of mineralogical composition, electrical conductivity and pH on the rheological properties of Latvian illite clays has been investigated. Samples from two deposits have been studied. The average plasticity index of samples from both Laza deposits is 23-25, but from Apriki - around 20. Based on these results, 2 sample s with different plasticity indices from each borehole were chosen for further research. All suspensions exhibityield-pseudoplastic behavior. Samples with the highest amount of clay minerals have the highest plasticity index and apparent viscosity. From 3 samples with similar amount of clay minerals and plasticity index one sample has higher pH and electrical conductivity and therefore exhibits lower viscosity., Inga Dusenkova, Valentina Stepanova, Jana Vecstaudza, Vitalijs Lakevics, Juris Malers and Liga Berzina-Cimdina., and Obsahuje bibliografické odkazy
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
33003. Rhetores and Strategoi in Fourth-Century Athens /
- Creator:
- Hansen, Mogens Herman,
- Type:
- text and studie
- Subject:
- Dějiny zemí starověkého světa, rétorika, města antická, and starověké Řecko, Kréta
- Language:
- English
- Rights:
- unknown
33004. Rhetoric and philosophy in Renaissance humanism :
- Creator:
- Seigel, Jerrold E.,
- Type:
- text and monografie
- Subject:
- Dějiny civilizace. Kulturní dějiny, humanismus, renesance, rétorika, filozofie, diskuse vědecké, dějiny vědy, umění, kultury a techniky, kulturní vztahy, světové dějiny středověku (do r. 1492), and světové dějiny 1492-1648
- Language:
- English
- Rights:
- unknown
33005. Rhetorical Strategies in the Correspondence between Johannes Caselius and the Livonian Humanist David Hilchen /
- Creator:
- Viiding, Kristi
- Type:
- text and studie
- Subject:
- Literatura různých forem a žánrů (o ní), Caselius, Johannes,, Hilchen, David,, korespondence soukromá, humanisté, vztahy vědecké, světové dějiny 1492-1648, and dějiny vědy, umění, kultury a techniky, kulturní vztahy
- Language:
- English
- Description:
- Rétorické strategie v korespondenci Johanna Caselia s livonským humanistou Davidem Hilchenem.
- Rights:
- unknown
33006. Rheumatoid factor-like IgM in Plasmodium berghei (Apicomplexa: Haemosporida) infections of BALB/c mice
- Creator:
- Hook, Reuel Robert, Green, Theodore J., and Stuart, Melissa K.
- Format:
- bez média and svazek
- Type:
- model:article and TEXT
- Subject:
- Plasmodium berghei, malaria, and rheumatoid factor
- Language:
- English
- Description:
- Groups of female BALB/c mice infected by intravenous injection with 50 erythrocytes containing Plasmodium berghei Vincke et Lips, 1948 were sacrificed on days 3 through 12 after infection. Rheumatoid factor-like IgM (RF-IgM) and parasite-specific IgG levels were determined by enzyme-linked immunosorbent assay in serum specimens and in culture medium removed from spleen cell cultures established at sacrifice. All four mouse IgG subisotypes were recognized by RF-IgM molecules induced by Plasmodium berghei infection, and in this regard, the parasite-induced RF-IgM response resembled that induced by lipopolysaccharide polyclonal activation. Plasmodium berghei infection resulted in a biphasic RF-IgM response, with infected animals demonstrating significantly increased levels of RF-IgM early in the infection and significantly decreased levels late in the infection, compared to uninfected control mice. The decreased levels of RF-IgM observed late in infection correlated with increasing parasitaemia levels, and were primarily due to a decrease in RF-IgM specific for mouse IgG2a. Late infection levels of RF-IgM specific for IgG1, IgG2b, and IgG3 were not significantly different from those of control animals.
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public
33007. Rhinebothrium jaimei sp. n. (Eucestoda: Rhinebothriidea: Rhinebothriidae): a new species from Neotropical freshwater stingrays (Potamotrygonidae)
- Creator:
- Marques, Fernando P. L and Reyda, Florian B
- Format:
- electronic, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- biologická systematika, biogeografie, biological systematics, biogeography, Brazílie, Brasil, cestoda, taxonomy, host specificity, Amazon, Neotropics, 2, and 59
- Language:
- English
- Description:
- a1_Neotropical freshwater stingrays (Batoidea: Potamotrygonidae) host a diversity of parasites, including some, like their hosts, that are marine-derived. Among the parasites of potamotrygonids, the cestode fauna is the most diverse, with multiple genera having been reported, including genera endemic to the freshwaters of the Neotropics and genera that have cosmopolitan distributions. Recent efforts have been made to document the diversity of cestodes of this host-parasite system and to refine the taxonomy of parasite lineages. The present study contributes to our knowledge of Rhinebothrium Linton, 1890, a diverse cosmopolitan genus of rhinebothriidean cestode, with 37 species reported from marine batoids, one species from a freshwater stingray in Borneo and six species from potamotrygonids. Rhinebothrium jaimei sp. n. is described from two species of potamotrygonids, Potamotrygon orbignyi (Castelnau) (type host) and Potamotrygon scobina Garman, from Bahía de Marajó of the lower Amazon region. It can be distinguished from most of its marine congeners via multiple attributes, including its possession of two, rather than one, posteriormost loculi on its bothridia and the lomeniform shape of its bothridium that is wider anteriorly. In addition, R. jaimei sp. n. can be distinguished from the six Rhinebothrium species described previously from potamotrygonids based on a unique combination of morphological features. Despite extensive stingray cestode sampling efforts throughout all major Neotropical river systems, we found that unlike most species of potamotrygonid Rhinebothrium species, which are widespread, R. jaimei sp. n. is restricted to the Bahía de Marajó., a2_The discovery of this new species of Rhinebothrium in Bahía de Marajó, an area in which potamotrygonids occur sympatrically with some species of euryhaline batoids (e.g. Dasyatis spp.) and share some trophic resources, suggest that modern ecological processes may be contributing to the distribution patterns of cestodes infecting potamotrygonids., Fernando P. L. Marques, Florian B. Reyda., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
33008. Rhineland Radicals :
- Creator:
- Sperber, Jonathan,
- Type:
- text and monografie
- Subject:
- Politické strany a hnutí, revoluce, hnutí demokratická, Německo, vnitřní politika, and světové dějiny 1789-1918
- Language:
- English
- Rights:
- unknown
33009. Rhipicephalus sanguineus sensu lato from dogs and dromedary camels in Riyadh, Saudi Arabia: low prevalence of vector-borne pathogens in dogs detected using multiplexed tandem PCR panel
- Creator:
- Chandra, Shona, Smith, Karen, Alanazi, Abdullah D, Alyousif, Mohamed S, Emery, David, and Jan R Šlapeta
- Format:
- print, počítač, and online zdroj
- Type:
- model:article and TEXT
- Subject:
- morfologie (biologie), morphology (biology), brown dog tick, molecular identity, mtDNA, real-time PCR, SEM, 2, and 59
- Language:
- English
- Description:
- Despite the global distribution of the brown dog tick, Rhipicephalus sanguineus (Latreille, 1806) sensu lato (s.l.), limited information exists about their identity from the Arabian Peninsula. Ticks from free roaming urban dogs and dromedary camels in Riyadh, Saudi Arabia were morphologically identified, confirmed with scanning electron microscopy and characterised at mitochondrial DNA (cox1, 12S rDNA and 16S rDNA). A total of 186 ticks were collected from 65 free roaming dogs (n = 73) and 84 dromedary camels (n = 113). Morphologically, 5.9% (11/186) were R. sanguineus s.l. and Hyalomma spp. (93.5%, 174/186). From within R. sanguineus s.l., the presence of Rhipicephalus cf. camicasi Morel, Mouchet et Rodhain, 1976 (1 dog, 2 camels) and Rhipicephalus turanicus Pomerantsev, 1936 (1 camel) is reported. The examined R. cf. camicasi form a sister group to R. sanguineus s.l. tropical lineage at all DNA markers. Dogs were parasitised by Hyalomma dromedarii Koch, 1844 (n = 59), Hyalomma impeltatum Schulze et Schlottke, 1930 (n = 1), Hyalomma excavatum Koch, 1844 (n = 2), Hyalomma turanicum Pomerantsev, 1946 (n = 1) and Hyalomma rufipes Koch,1844 (n = 1). DNA from dog blood (n = 53) from Riyadh confirmed a low prevalence of canine vector-borne pathogens that does not exceed 5.7% for Babesia spp., Mycoplasma spp., Anaplasma platys, Hepatozoon canis and Ehrlichia canis using multiplexed tandem PCR (MT-PCR) and diagnostic PCR. Low prevalence of R. sanguineus s.l. on dogs likely contributed to the low level of canine vector-borne pathogens in Saudi Arabia. We demonstrate that dogs in the central Arabian Peninsula are more commonly parasitised by Hyalomma spp. than R. sanguineus s.l., Shona Chandra, Karen Smith, Abdullah D. Alanazi, Mohamed S. Alyousif, David Emery, Jan Šlapeta., and Obsahuje bibliografii
- Rights:
- http://creativecommons.org/publicdomain/mark/1.0/ and policy:public
33010. Rho-kinase inhibition attenuates acute hypoxic fetoplacental vasoconstriction in the rat
- Creator:
- Kafka, P., Olga Vajnerová, Jan Herget, and Václav Hampl
- Type:
- article, články, model:article, and TEXT
- Subject:
- Fyziologie člověka a srovnávací fyziologie, fyziologie člověka, human physiology, hypoxic fetoplacental vasoconstriction, calcium sensitization, rho-kinase pathway, placenta, fasudil, 14, and 612
- Language:
- English
- Description:
- The vessels on the fetal side of the placenta differ from most other vascular beds except the lungs in that they respond to acute hypoxia by vasoconstriction. An essential role of calcium influx in the mechanism of this hypoxic fetoplacental vasoconstriction (HFPV) has been shown previously. That finding does not, however, exclude the possible involvement of other mechanisms of vascular tone regulation. In this study we tested the hypothesis that Rho-kinase-mediated calcium sensitization is involved in HFPV. We used a model of isolated rat placenta dually perfused (from both the maternal and fetal side) with Krebs salt solution saturated with normoxic and hypoxic gas mixture respectively at constant flow rate. Rho-kinase pathway was inhibited by fasudil (10 μM). We found that fasudil reduced basal normoxic fetoplacental vascular resistance and completely prevented HFPV. This suggests that the activity of Rho-kinase signaling pathway is essential for HFPV., P. Kafka, ... [et al.]., and Obsahuje seznam literatury
- Rights:
- http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public