Search results for "sols"

TGF-beta regulates airway responses via T cells.

2003

Abstract Allergic asthma is characterized by airway hyperreactivity, inflammation, and a Th2-type cytokine profile favoring IgE production. Beneficial effects of TGF-β and conflicting results regarding the role of Th1 cytokines have been reported from murine asthma models. In this study, we examined the T cell as a target cell of TGF-β-mediated immune regulation in a mouse model of asthma. We demonstrate that impairment of TGF-β signaling in T cells of transgenic mice expressing a dominant-negative TGF-β type II receptor leads to a decrease in airway reactivity in a non-Ag-dependent model. Increased serum levels of IFN-γ can be detected in these animals. In contrast, after injection of OVA …

Development of protofragipanic horizon after severe degradation processes of greenhouses soil

2014

Plant growing in greenhouses and plastic tunnels has some advantages: obtaining early production, plant protection against hail, hoarfrost, late spring and early autumn frosts. The main criteria considered for setting greenhouses are the existence of heating and water sources. Due to the compulsory location imposed by the above conditions, many greenhouses were placed on soils having low capability. After application of ameliorative measures some satisfactory results could be obtained on a relatively short period. Our studies on some soils in greenhouses and plastic tunnels in Romania have shown that after 15-20 years of the intensive exploitation an impermeable soil horizon with brittle bl…

Combined effect of turbulence and aerosol on free-space optical links

2017

[EN] Despite the benefits of free-space optical (FSO) communications, their full utilization is limited by the influence of atmospheric weather conditions, such as fog, turbulence, smoke, snow, etc. In urban environments, additional environmental factors such as smog and dust particles due to air pollution caused by industry and motor vehicles may affect FSO link performance, which has not been investigated in detail yet. Both smog and dust particles cause absorption and scattering of the propagating optical signal, thus resulting in high attenuation. This work investigates the joint impact of atmospheric turbulence and dust particle-imposed scattering on FSO link performance as part of the…

RVVS 2013

2013

Studies of technogenic soils in Poland: past, present, and future perspectives

2020

Gleby występujące na obszarach silnie przekształconych przez człowieka były przez długi czas ignorowane w dyskursie naukowym. Również gospodarcze wykorzystanie tych gleb było ogra-niczone ze względu na ich nieproduktywność. Jedynie duże tereny pogórnicze zrekultywowane w kierunku leśnym lub rolnym były bardziej interesujące zarówno z punktu widzenia badańnaukowych, jak i ich praktycznego wykorzystania. W przypadku terenów pogórniczych termin „teren bezglebowy” był używany przez długi czas, zwłaszcza w odniesieniu do terenów nie rekul-tywowanych. W artykule opisano historyczne badania gleb technogenicznych w Polsce (opubli-kowane do końca XX wieku). Gleby technogeniczne terenów miejskich i p…

Biofuel blending reduces particle emissions from aircraft engines at cruise conditions.

2017

Aviation-related aerosol emissions contribute to the formation of contrail cirrus clouds that can alter upper tropospheric radiation and water budgets, and therefore climate1. The magnitude of air-traffic-related aerosol–cloud interactions and the ways in which these interactions might change in the future remain uncertain. Modelling studies of the present and future effects of aviation on climate require detailed information about the number of aerosol particles emitted per kilogram of fuel burned and the microphysical properties of those aerosols that are relevant for cloud formation. However, previous observational data at cruise altitudes are sparse for engines burning conventional fuel…

Soils with Gypsic horizon in southern Sicily, Italy

2005

Excretion and metabolism of phenol, 4-nitrophenol and 2-methylphenol by the frogs Rana temporaria and Xenopus laevis.

1987

1. Rana and Xenopus excrete 90-95% dose, and metabolize 50-65% dose of phenol, 4-nitrophenol and 2-methylphenol within 24 h, to about the same extent. 2. Kinetic data for the excretion of phenols from both species fit a two-compartment model. The elimination constants of Rana and Xenopus are not significantly different. 3. Metabolism is mostly conjugation by glucuronidation and sulphation of the original phenols. Additionally, oxidations leading to dihydroxyphenols and benzoic acid from 2-methylphenol, and reduction of 4-nitrophenol occur, followed by conjugation. 4. There is an important difference between the metabolite patterns of Rana and Xenopus in that the latter is unable to glucuron…

Les sols viticoles de Bourgogne : élaboration naturelle et construction humaine

2011

Sediment origin and pedogenesis in the former mill pond basin of Turznice (north-central Poland) based on magnetic susceptibility measurements

2016

Abstract This paper aims to assess the usefulness of magnetic susceptibility measurements in pedological studies of mill pond sediments. The study area includes the former Turznice mill pond basin located in the south-eastern part of the Grudziądz Basin. Four soil profiles were selected within the transect located along the longitudinal axis of the basin. The following soil properties were determined in the collected samples: bulk density, particle size distribution, pH, content of carbonates, approximate content of organic matter (LOI), total organic carbon (TOC), total nitrogen (Nt), and the pseudo-total contents of metals (Fe, Mn, Cu, Zn, Pb, Ni, Cd). The obtained results were correlated…