Rzeszow, Poland
Rzeszow, Poland

The University of Rzeszów is a university in Rzeszów, Poland.It was officially established in 2001 by combining several older institutions in the city.The current university comprises the former: Rzeszów branch of the Maria Curie-Skłodowska University Higher School of Education Economics department of the Hugo Kołłątaj Academy of AgricultureThe school has over 22,000 students. Wikipedia.

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Abbas C.A.,Archer Daniels Midland Company | Sibirny A.A.,Ukrainian Academy of Sciences | Sibirny A.A.,University of Rzeszow
Microbiology and Molecular Biology Reviews | Year: 2011

Riboflavin [7,8-dimethyl-10-(1′-D-ribityl)isoalloxazine, vitamin B2] is an obligatory component of human and animal diets, as it serves as the precursor of flavin coenzymes, flavin mononucleotide, and flavin adenine dinucleotide, which are involved in oxidative metabolism and other processes. Commercially produced riboflavin is used in agriculture, medicine, and the food industry. Riboflavin synthesis starts from GTP and ribulose-5-phosphate and proceeds through pyrimidine and pteridine intermediates. Flavin nucleotides are synthesized in two consecutive reactions from riboflavin. Some microorganisms and all animal cells are capable of riboflavin uptake, whereas many microorganisms have distinct systems for riboflavin excretion to the medium. Regulation of riboflavin synthesis in bacteria occurs by repression at the transcriptional level by flavin mononucleotide, which binds to nascent noncoding mRNA and blocks further transcription (named the riboswitch). In flavinogenic molds, riboflavin overproduction starts at the stationary phase and is accompanied by derepression of enzymes involved in riboflavin synthesis, sporulation, and mycelial lysis. In flavinogenic yeasts, transcriptional repression of riboflavin synthesis is exerted by iron ions and not by flavins. The putative transcription factor encoded by SEF1 is somehow involved in this regulation. Most commercial riboflavin is currently produced or was produced earlier by microbial synthesis using special selected strains of Bacillus subtilis, Ashbya gossypii, and Candida famata. Whereas earlier RF overproducers were isolated by classical selection, current producers of riboflavin and flavin nucleotides have been developed using modern approaches of metabolic engineering that involve overexpression of structural and regulatory genes of the RF biosynthetic pathway as well as genes involved in the overproduction of the purine precursor of riboflavin, GTP. Copyright © 2011, American Society for Microbiology. All Rights Reserved.

Szemela K.,University of Rzeszow
Archives of Acoustics | Year: 2015

Applying rigorous analytical methods, formulas describing the sound radiation have been obtained for the wedge region bounded by two transverse baffles with a common edge and bottom. It has been assumed that the surface sound source is located at the bottom. The presented formulas can be used to calculate the sound pressure and power inside the wedge region. They are valid for any value of the wedge angle and represent a generalization of the formulas describing the sound radiation inside the two and three-wall corner region. Moreover, the presented formulas can be easily adapted for any case when more than one sound source is located at the bottom. To demonstrate their practical application, the distribution of the sound pressure modulus and the sound power have been analyzed in the case of a rectangular piston located at the wedge's bottom. The influence of the transverse baffle on the sound power has been investigated. Based on the obtained formulas, the behaviour of acoustic fields inside a wedge can be predicted. Copyright © 2015 by PAN - IPPT.

Luczaj L.,University of Rzeszow
Acta Societatis Botanicorum Poloniae | Year: 2012

This paper is an ethnobotanical review of wild edible plants gathered for consumption from the 19th century to the present day, within the present borders of Slovakia. Twenty-four sources (mainly ethnographic) documenting the culinary use of wild plants were analysed. The use of 106 species (over 3% of the Slovak flora) has been recorded. Nowadays most of them are no longer used, or used rarely, apart from a few species of wild fruits. The most frequently used plants include the fruits of Rubus idaeus, Fragaria spp., Rubus subgenus Rubus, Vaccinium myrtillus, V. vitis-idaea, Fagus sylvatica, Corylus avellana, Prunus spinosa, Pyrus spp., Malus spp., Crataegus spp. and the leaves of Urtica dioica, Rumex acetosa, Chenopodiaceae species, Cardamine amara, Glechoma spp., Taraxacum spp. and Oxalis acetosella. The most commonly used wild food taxa are nearly identical to those used in Poland, and the same negative association of wild vegetables with famine exists in Slovakia, resulting in their near complete disappearance from the present-day diet. © The Author(s) 2012.

Maciula R.,Polish Academy of Sciences | Szczurek A.,University of Rzeszow
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

We discuss inclusive production of open charm in proton-proton scattering at LHC. The calculation is performed within the kt-factorization approach. Different models of unintegrated gluon distributions (UGDFs) from the literature are used. The theoretical transverse momentum as well as (pseudo)rapidity distributions of charmed mesons are compared with recent experimental data of the ATLAS, ALICE, and LHCb Collaborations. Only the calculation with Kimber-Martin-Ryskin UGDF gives results comparable to experimental ones. All other popular models of UGDF significantly underpredict experimental data. Several sources of uncertainties of the theoretical predictions are also studied in detail. In addition, we discuss correlations between D and D̄ mesons. Good description of experimental distribution in invariant mass and in relative azimuthal angle between D and D̄ mesons is achieved for the Kimber-Martin-Ryskin UGDF. The considered correlation observables measured by the LHCb experiment were not discussed in other approaches in the literature © 2013 American Physical Society.

Durak T.,University of Rzeszow
Forest Ecology and Management | Year: 2012

Development of more sustainable forest management methods is heavily reliant on the profound understanding of interactions between management methods and the forest vegetation. This study presents an analysis of changes in the interactions between the diversity of the tree and herb layers over the past 50. years in the previously over-exploited Eastern Carpathian beech forests. After the anthropogenic pressure related to large scale forest clearings, intense forestry and agricultural use ceased, the regeneration processes accompanied two distinct routes (1) implementation of more sustainable forest management (shelterwood system) and (2) complete cessation of land use. The vegetation diversity and its dependence on the biotic and abiotic factors has been examined based on the data collected from 62 semi-permanent plots during two sampling periods: 1955-1962 and 2005-2009. The plots were located within the polish part of the "Eastern Carpathian" International Biosphere Reserve. The analysis included forest management methods, diversity indicators specific to different vegetation layers, indicator species groups, individual tree species, canopy density and the height of the forest stand. The main direction in changes indicates an increase in strength of the correlation between the diversity of tree and herb layers, caused by a change in the factor differentiating the diversity of the tree layer from a historical one related to general use of the land by the autochthonous people to an environmental one. Sycamore has been identified as a highly important species responsible for maintaining the stability and diversity of the herb layer structure. It has also been verified that analysis conducted using general diversity indicators does not truly reflect the interrelations between the tree and herb layer vegetation. A better representation of these interactions is provided by an analysis incorporating individual tree species and indicator species groups. Three distinct diversity patterns of the tree and herb layers have been distinguished, depending on the developmental stage of the forest and the management method implemented. First one, specific to heavily disturbed, overexploited maturing forests from the period between 1955 and 1962 is characterised by a weak relationship between the diversity of the tree and herb layer vegetation and a major role of sycamore in development of the herb layer structure. The second pattern was identified in mature forest stands, where more sustainable management methods were implemented. The second pattern is characterised by a strong relationship between the diversity of the tree and herb layer with a concomitant decrease in the importance of sycamore and an increase in the negative effects of beech exerted on the herb layer structure, which consequently undergoes homogenisation due to a decrease in habitat heterogeneity. The third pattern was described for unmanaged, mature forests, in which an emerging relationship between the diversity of tree and herb layers accompanied by a more diverse structure of the herb layer maintained by the presence of sycamore within the forest stand as well as the presence of large quantity of coarse woody debris has been identified. © 2012 Elsevier B.V.

Boek P.,H Niewodniczanski Institute Of Nuclear Physics | Boek P.,University of Rzeszow
Physical Review C - Nuclear Physics | Year: 2012

We apply the hydrodynamic model to the dynamics of matter created in p-Pb collisions at √s NN=4.4 TeV and d-Pb collisions at √s NN=3.11 TeV. The fluctuating initial conditions are calculated in the Glauber Monte Carlo model for several centrality classes. The expansion is performed event by event in (3+1)-dimensional viscous hydrodynamics. Noticeable elliptic and triangular flows appear in the distributions of produced particles. © 2012 American Physical Society.

Boek P.,H Niewodniczanski Institute Of Nuclear Physics | Boek P.,University of Rzeszow
Physical Review C - Nuclear Physics | Year: 2012

The expansion of the fireball created in Au-Au collisions at √s NN=200 GeV is described in (3 + 1)-dimensional viscous hydrodynamics with shear and bulk viscosities. We present results for the transverse momentum spectra, the directed and elliptic flow, and the interferometry radii. © 2012 American Physical Society.

Banas A.,University of Rzeszow
Methods in Molecular Biology | Year: 2012

There is a great interest in the development of functional hepatocytes in vitro from different types of stem cells. Multipotential mesenchymal stem cells (MSC) compose a great source for stem cell based therapy, especially, because they can be obtain from patients own tissues, sidestepping immunocompatibility and ethical issues. Among MSCs from different sources, adipose-tissue-derived mesenchymal stem cells (AT-MSCs) are very promising because of their high accessibility, proliferation ability, potentiality, and immunocompatibility. AT-MSCs can be easily isolated from stroma vascular fraction (SVF) of adipose tissue. They represent a heterogeneous population of cells. The precise AT-MSCs's marker profile has not been defined yet; therefore, it is still not obvious how to purify these heterogeneous fraction of cells. We postulate that one of the markers defining MSC provenance is CD105 (endoglin). Therefore, we have sorted CD105 + fraction of AT-MSCs, expanded them, and differentiated toward hepatic-like cells. In order to check their potentiality, we have firstly differentiated sorted CD105 + AT-MSCs toward mesoderm lineages, using commercialized protocols. We have shown here, that pure CD105 + AT-MSCs fraction revealed higher homogeneity and differentiation potential toward adipogenic, osteogenic, and chondrogenic lineages and highly inducible into the hepatogenic lineage. Generated (by using our hepatic differentiation protocol) CD105 + AT-MSCs-derived hepatic-like cells expressed hepatocyte markers, enzymes, and functions. © 2012 Springer Science+Business Media, LLC.

Pekala B.,University of Rzeszow
Information Sciences | Year: 2012

The goal of this paper is to consider properties of Atanassov's intuitionistic fuzzy relations which were introduced by Atanassov in 1986. Fuzzy set theory turned out to be a useful tool to describe situations in which the data are imprecise or vague. Atanassov's intuitionistic fuzzy set theory is a generalization of fuzzy set theory which was introduced by Zadeh in 1965. This paper is a continuation of examinations by Pȩkala [22] on the interval-valued fuzzy relations. We study standard properties of Atanassov's intuitionistic fuzzy relations in the context of Atanassov's operators. © 2012 Elsevier Inc. All rights reserved.

Bozek P.,University of Rzeszow | Bozek P.,Polish Academy of Sciences
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

We calculate the elliptic flow of charged particles in Pb-Pb collisions at s=2.76 TeV in relativistic viscous hydrodynamics. The recent data of the ALICE Collaboration on the elliptic flow as function of the centrality can be very well described using the hydrodynamic expansion of a fluid with a small shear viscosity μ/s=0.08. The elliptic flow as function of the transverse momentum shows systematic deviations from a hydrodynamic behavior in the small momenta region p⊥<800 MeV. It indicates that a non-negligible contribution of non-thermalized particles from jet fragmentation is present. © 2011 Elsevier B.V.

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