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    Wyświetlanie 1-4 z 4
    Tytuł:
    Pyrite flotation in the presence of galena. Study on galvanic interaction
    Autorzy:
    Allahkarami, E.
    Poor, A. Z.
    Rezai, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/110735.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    galena
    pyrite
    galvanic interactions
    Opis:
    In this investigation, galvanic interaction between galena and pyrite in flotation and its effect on floatability of pyrite were studied. Rest and mixed potential studies in the presence and absence of a collector indicated that pyrite was nobler than galena under all investigated conditions. Therefore, pyrite served as a cathode in galvanic interactions with galena. Floatability of pyrite was performed alone and as a mixture with galena in the ratios of pyrite to galena equal to 1:4, 1:1 and 4:1. The experiments were conducted with air and nitrogen. In any galvanic contact between pyrite and galena, anodic oxidation occurred on the galena surface, and hydrolysed lead species adsorbed on the pyrite surface. The investigation of the various reactions occurring on the sample surface was investigated by ethylene diamine-tetra acetic acid disodium salt (EDTA) extraction and X-ray photoelectron spectroscopy (XPS) measurements. In the presence of nitrogen, floatability of pyrite increased. The recovery of pyrite in the presence of air was 22%, while in the mixture with galena (ratio 1:4) the recovery increased to 43%. The results indicated that the presence of galena improved floatability of pyrite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2017, 53, 2; 846-858
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mineral content analysis of unifloral honeys from the Hungarian Great Plain
    Autorzy:
    Ördög, A.
    Tari, I.
    Bátori, Z.
    Poór, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/960108.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Honey is a key product of the traditional agriculture in Hungary and an important export commodity of the Hungarian commerce. The content of metals in honeys is essential for food quality and safety, in addition to which it provides elemental fingerprints about the region where the honey was collected. The aim of this study was to determine and compare the element content of black locust, oilseed rape and sunflower honey samples collected from the southern part of the Hungarian Great Plain. The major (K and Mg), trace (Fe, Zn, Cu, Mn, B, Al, Co, Ni, Se and Mo) and toxic elements (As, Pb and Cd) of the samples were determined by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). Principal Component Analysis (PCA) was performed to compare the mineral content of the different honey types. Our analyses revealed that K was the most abundant element in the investigated honey samples. Among the trace elements, B, Fe, Zn and Cu were found in the highest concentrations. Sunflower honey contained the highest concentrations of K, Mg and Mn, while oilseed rape honey showed the highest B content. The mineral content of honeys decreased in order of sunflower, oilsed rape and black locust. There were no differences among the honey types in the toxic element content (As, Pb and Cd), which was under the detection limit in many honey samples. According to the multivariate method, the Mg, B, Al, K and Zn contents are considered to be the most important indicator for distinguishing the investigated honey samples and types. The results obtained from the mineral content analyses showed that differences in major, trace and toxic elements between Hungarian unifloral honeys as well as a detailed comparison of honeys with different geographic origins can be used for quality assessment.
    Źródło:
    Journal of Elementology; 2017, 22, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the mineral content of processed spice samples of sweet and hot paprika from the Szeged region
    Autorzy:
    Ordog, A.
    Poor, P.
    Stajner, D.
    Popovic, B.
    Batori, Z.
    Tari, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/15642.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:
    The alleviation of the adverse effects of salt stress in the tomato plant by salicylic acid shows a time-and organ-specific antioxidant response
    Autorzy:
    Tari, I.
    Csiszar, J.
    Horvath, E.
    Poor, P.
    Takacs, Z.
    Szepesi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/19644.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    In the last decade contradictory results have been published as to whether exogenous salicylic acid (SA) can increase salt stress tolerance in cultivated plants by inducing an antioxidant response. Salt stress injury in tomato was mitigated only in cases when the plant was hardened with a high concentration of SA (~10-4 M), low concentrations were ineffective. An efficient accumulation of Na+ in older leaves is a well-known response to salt stress in tomato plants (Solanum lycopersicum cv. Rio fuego) but it remains largely unexplored whether young and old leaves or root tissues have a distinct antioxidant status during salt stress after hardening with 10-7 M or 10-4 M SA. The determination of superoxide dismutase (SOD) and catalase (CAT) activity revealed that the SAinduced transient increases in these enzyme activities in young leaf and/or root tissues did not correlate with the salt tolerance of plants. Salt stress resulted in a tenfold increase in ascorbate peroxidase (APX) activities of young leaves and significant increases in APX and glutathione reductase (GR) activities of the roots hardened with 10-4 M SA. Both total ascorbate (AsA) and glutathione pools reached their highest levels in leaves after 10-7 M SA pre-treatment. However, in contrast to the leaves, the total pool of AsA decreased in the roots under salt stress and thus, due to low APX activity, active oxygen species were scavenged by ascorbate non-enzymatically in these tissues. The increased GR activities in the roots after treatment with 10-4 M SA enabled plants to enhance the reduced glutathione (GSH) pool and maintain the redox status of AsA under high salinity, which led to increased salt tolerance.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2015, 57, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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