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Wyświetlanie 1-14 z 14
Tytuł:
Changes of hypogeous fungi in the Carpathian-Pannonian region in the past centuries
Autorzy:
Bratek, Z.
Merenyi, Z.
Varga, T.
Powiązania:
https://bibliotekanauki.pl/articles/67832.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
hypogeous fungi
fungi
Carpathian-Pannonian region
fungi list
distribution
new species
rare species
Hungary
Opis:
The exploration of hypogeous fungi in the Carpathian-Pannonian region speeded up in the past decades, owing to the widespread of truffle hunting with dogs. As a result, not only several new species were found in the region, but our view of the frequency of truffles also changed fundamentally. It became evident that Tuber aestivum, T. brumale, T. macrosporum, T. magnatum, T. mesentericum and Mattirolomyces terfezioides can be collected in commercial quantity. Among the dog preferred hypogeous fungi (DPH) several species, earlier believed to be rare like Octaviania asterosperma and Stephensia bombycina, also occurred. The taxonomic alterations and revisions brought about changes in the list of hypogeous fungi, and further changes are expected from molecular taxonomy research on a number of genera at present.
Źródło:
Acta Mycologica; 2013, 48, 1
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The development of Hungarian agricultural insurance system
Autorzy:
Kemeny, G.
Varga, T.
Fogarasi, J.
Toth, K.
Powiązania:
https://bibliotekanauki.pl/articles/572815.pdf
Data publikacji:
2012
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Źródło:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2012, 12[27], 3
2081-6960
Pojawia się w:
Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polylactide nanofibers in skin tissue engineering
Autorzy:
Bacakova, M.
Varga, M.
Riedel, T.
Stranska, D.
Bacakova, L.
Powiązania:
https://bibliotekanauki.pl/articles/283841.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanofibers
tissue engineering
biomaterials
Opis:
Various artificial or natural biomaterials can be used for constructing a scaffold suitable for treating skin injuries. Artificial skin replacements are made from polyhema, polybutylene terephthalate, nylon, polylactic acid and polyglycolic acid or their copolymers. The most widely applied natural biomaterials are collagen, chitin, hyaluronic acid and chondroitin sulfate [1]. In recent tissue engineering, nanofibrous scaffolds have been very attractive because they better simulate the architecture of natural extracellular matrix. In skin tissue engineering, nanofibrous membranes can be used for constructing a bilayer of fibroblasts and keratinocytes [2]. These membranes will separate the two cell types, ensuring their physical and humoral communication; thus the layer of fibroblasts will serve as a feeder for keratinocytes. For our study, we chose nanofibers made of polylactide (PLA), prepared in external collaboration with Elmarco Ltd. (Liberec, Czech Republic). The main advantage of PLA is its biodegradability; it is slowly resorbed in the organism, and is finally replaced by regenerate tissue. The adhesion and growth of cells on the scaffolds can be improved by further modifications, e.g. plasma treatment or coating the scaffold fibers with biomolecules that are normally present in the natural skin (collagen, hyaluronic acid), or that occur during wound healing (fibrin). Modification by plasma leads to changes in the physical and chemical properties of the material surface (i.e., surface wettability, morphology, electric conductivity, roughness, morphology, mechanical properties) [3]. In our experiment we evaluated the interaction of human HaCaT keratinocytes with PLA nanofibrous meshes that were modified by plasma irradiation or by coating with collagen, fibrin and hyaluronan of low (70-120 KDa) or high (1000-1250 KDa) molecular weight. For plasma irradiation, PLA nanofibers were exposed to O2, CH4 or Ar plasma for different times, with various ranges of power. For more detailed studies, O2 plasma was chosen, because this type of plasma best supported the adhesion and growth of cells. PLA nanofibrous meshes were prepared with different densities of the fibres (5 g/m2, 9 g/m2, 16 g/m2, 30 g/m2). The potential damage to the fibres after plasma modification was observed using scanning electron microscopy (SEM). The cell adhesion, growth and metabolic activity were evaluated by the number of cells, their morphology, the amount of cellular DNA (PicoGreen ds DNA assay kit, Invitrogen®) and the XTT test (Roche) on days 1, 3 and 7 after seeding. The results indicated that polylactide nanofibrous scaffolds promote adhesion and growth of HaCaT keratinocytes. Modification in plasma further improved the proliferation of cells on PLA nanofibers. The cells proliferated better on PLA meshes with lower densities of the fibers (5 g/m2, 9g/m2). SEM showed that damage to the fibers increased with the length of the period of plasma treatment. The collagen deposited on the fibers changed the morphology of the cells. The cells on the control unmodified fibers adhered in clusters, but on the collagen-coated fibers they were spread homogeneously. We can conclude that polylactide nanofibrous membranes are a promising material for the construction of temporary carriers for skin cells, particularly after they have been physically or biologically modified.
Źródło:
Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 127-128
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Characterization of $Co_2MnSi$ Heusler Microwires
Autorzy:
Ryba, T.
Vargova, Z.
Varga, R.
Kováč, J.
Zhukova, V.
Zhukov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1368011.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Cc
75.30.Gw
Opis:
We report on the basic magnetic properties of glass-coated $Co_2MnSi$ Heusler microwires. Measurements of hysteresis loops in different directions show that easy magnetization axis coincides with the wire's axis. The frequency dependence of the coercive field has been measured at room temperature in the frequency range from 10 Hz to 10 kHz. The coercivity decreases with the frequency up to 100 Hz and then increases linearly up to 1 kHz.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 196-197
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure of Melt-Spun Co₂MnAl Heusler Alloy
Autorzy:
Piovarči, S.
Diko, P.
Kavečanský, V.
Ryba, T.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032646.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
75.50.Cc
61.05.cp
Opis:
The growth-related microstructure and texture of the Co₂MnAl-type Heusler alloy in the form of a melt-spun ribbon was studied by electron microscopy, electron backscattered diffraction and X-ray diffraction. It is shown that melt spinning produces a single-phase disordered Heusler alloy. The fine grain structure at the wheel side of the ribbon exhibits no texture, while dominant columnar grain structure formed on the free surface side exhibits the ⟨111⟩ fibre texture with a declination by about 10 degrees in the spinning direction. The dendritic growth of columnar crystals causes inhomogeneity of the chemical composition on a micrometre scale with a higher Co and Al concentration in the centre of dendritic arms and a higher concentration of Mn at the dendrite arm boundaries.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 881-883
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys
Autorzy:
Hašková, V.
Szabó, P.
Kováč, J.
Ryba, T.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1385695.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.25.Ba
74.45.+c
77.80.bg
Opis:
The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co₂CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co₂CrAl and $Co₂Cr_{0.6}Fe_{0.4}Al$ ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for $Co₂Cr_{0.6}Fe_{0.4}Al$. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of $Co₂Cr_{0.6}Fe_{0.4}AlP₀$ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in $Co₂Cr_{1-x}FeₓAl$ Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 377-378
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and structural characterization of NiXSb (X = Mn, Cr) Heusler ribbon
Autorzy:
Ryba, T.
Vargova, Z.
Ilkovic, S.
Reiffers, M.
Kravcak, J.
Gyepes, R.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1050967.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.47.Np
75.30.Gw
85.75.-d
Opis:
Half-Heusler alloys with composition NiMnSb and NiCrSb have been prepared by rapid-quenching method. NiMnSb half-Heusler alloy is characterized by single phase C1_{b} with polycrystalline structure while crystalline structure of NiCrSb shows multiphase system. Magnetic measurements indicated high anisotropy and easy magnetization direction in the parallel direction with respect to ribbon axis for NiMnSb alloy while paramagnetic behavior appears for NiCrSb alloy down to 50 K.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 857-859
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Mn doping on magnetic and structural properties of Co₂FeSi Heusler alloy
Autorzy:
Galdun, L.
Ryba, T.
Kováč, J.
Prida, V.
Hernando, B.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1054765.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
72.20.Lp
Opis:
We have studied the effect of Mn doping on structural and magnetic properties of Co₂FeSi Heusler alloy. Co₂FeSi, Co₂Mn_{0.25}Fe_{0.75}Si and Co₂Mn_{0.5}Fe_{0.5}Si alloys were prepared by melt spinning technique which offers fast and simple production of large amount of materials in a single production step. The rapid quenching method provides an opportunity to prepare Heusler alloys with highly ordered L2₁ structure confirmed by X-ray analysis in all the samples. Magnetic measurements revealed high Curie temperatures (>1000 K) and well defined easy magnetization plane parallel with the ribbon plane. Those attributes predispose given samples for applications in spintronics.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 866-868
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic and Structural Characterization of Nickel and Iron Based Heusler Ribbons Ni₂FeZ (Z = In, Sn, Sb)
Autorzy:
Frol'ová, L.
Ryba, T.
Vargová, Z.
Komanický, V.
Kováč, J.
Gyepes, R.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032228.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.20.En
75.30.Gw
Opis:
Comparison of structural, chemical, and magnetic properties of Ni₂FeZ (Z = In, Sn, Sb) Heusler ribbons produced by melt-spinning method is presented. The aim of work was to prepare the Heusler alloys with the appropriate chemical composition in a single step without additional thermal treatment. Scanning electron microscopy analysis revealed polycrystalline structure of all samples. It is shown that correct L2₁ structure of Ni₂FeSb can be obtained in a single production step. On the other hand, no Heusler L2₁ phase (nor its variants) occur in Ni₂FeSn alloy. Additionally, magnetic characterization revealed high Curie temperatures of the Heusler phases (above 600 K for Ni₂FeSb and 800 K for Ni₂FeIn).
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 735-737
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coexistence of Ferromagnetism and Superconductivity in Rapidly Quenched Ni_2NbSn Heusler Alloy
Autorzy:
Kanuch, P.
Ryba, T.
Gamcová, J.
Kanuchova, M.
Durisin, M.
Saksl, K.
Vargova, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032848.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
74.25.fc
74.25.Ha
74.62.Bf
74.70.Ad
75.50.Cc
Opis:
We present the study on production and structural, electric and magnetic properties of superconductive Ni₂NbSn Heusler alloy. The sample has been produced by melt-spinning method using tangential speed of copper wheel 20 m/s. Polycrystalline structure has been obtained showing single phase with B2 disorder with lattice constant a=6.1654 Å. Resistance measurement shows superconductive behavior with critical temperature close to 5 K. Magnetic measurements also exhibit diamagnetic contribution from superconductive phase. Additionally, the ferromagnetic state has been observed below 20 K, which points to the coexistence of magnetic and superconducting state.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1057-1059
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ni_2FeSi Heusler Glass Coated Microwires
Autorzy:
Galdun, L.
Ryba, T.
Prida, V.
Hernando, B.
Zhukova, V.
Zhukov, A.
Vargová, Z.
Varga, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032750.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Be
72.20.Lp
Opis:
We report on fabrication, structural and magnetic properties of novel Heusler-type glass coated Ni₂FeSi microwires that were prepared by the Taylor-Ulitovsky method, having a metallic nucleus diameter about 3.9 μm and total sample diameter of 39 μm. This single step and low cost fabrication technique offers to prepare up to km of glass-coated microwires starting from few g of cheap elements for diverse applications. The X-ray diffraction data from the metallic nucleus indicates L2₁ crystalline structure (a=5.563 Å), with a possible DO3 disorder. Magnetic measurements determined the Curie temperature well above the room temperature (770 K) together with uniform easy magnetization axis of the metallic core, which predisposes this material to a suitable candidate for spintronic applications.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 851-853
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching
Autorzy:
Ryba, T.
Vargova, Z.
Varga, R.
Ilkovic, S.
Reiffers, M.
Haskova, V.
Szabo, P.
Kravcak, J.
Gyepes, R.
Powiązania:
https://bibliotekanauki.pl/articles/1368037.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.50.Cc
Opis:
NiMnSb half-Heusler alloy in the form of a rod has been prepared by rapid quenching (suction-casting) method. The rod is characterized by single phase $C1_b$ crystalline structure with lattice parameter a=5.982 Å. Magnetic measurements reveal an isotropic character of bulk NiMnSb alloy. Our study shows relatively high spin polarization of bulk NiMnSb in the range 35-50%.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 206-207
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nitrogen and sulphur fertilisation affecting soybean seed spermidine content
Autorzy:
Losak, T.
Sevcik, M.
Plchova, R.
von Bennewitz, E.
Hlusek, J.
Elbl, J.
Bunka, F.
Polasek, Z.
Antonkiewicz, J.
Varga, L.
Vollmann, J.
Powiązania:
https://bibliotekanauki.pl/articles/16135.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Źródło:
Journal of Elementology; 2018, 23, 2
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Applications of Bistable Magnetic Microwires
Autorzy:
Sabol, R.
Klein, P.
Ryba, T.
Hvizdos, L.
Varga, R.
Rovnak, M.
Sulla, I.
Mudronova, D.
Galik, J.
Polacek, I.
Zivcak, J.
Hudak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032633.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Jk
Opis:
Few examples of technical and biomedical applications of bistable magnetic microwires are shown. Particularly, application of microwires in civil engineering are shown for sensing the mechanical stress in concrete, steel structure or steel cable by simple gluing it on the surface of studied structure. On the other hand, biomedical applications for sensing the stress, temperature, and position inside the human or animal body are shown. Experiments with pig intestine cells points to the biocompatibility of glass coated microwires.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1150-1152
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-14 z 14

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