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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effect of Lead, Silver and Molybdenum on Steroidogenesis in Porcine Ovarian Granulosa Cells in Vitro
    Wpływ ołowiu, srebra i molibdenu na steroidogenezę in vitro w komórkach ziarnistych jajników świni
    Autorzy:
    Kolesárová, A.
    Capcarova, M.
    Sirotkin, A.
    Kovacik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/389305.pdf
    Data publikacji:
    2010
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    ołów
    srebro
    molibden
    progesteron
    steroidogeneza
    komórki ziarniste
    lead
    silver
    molybdenum
    progesterone
    steroidogenesis
    granulosa cells
    Opis:
    The present study was carried out to investigate possible effects of lead (Pb), silver (Ag) and molybdenum (Mo) administrations on porcine ovarian granulosa cells in relation to progesterone (P4) release. Ovarian granulosa cells were incubated with/without lead acetate, silver nitrate and ammonium molybdate for 18 hours: 1.0 mg/cm3; 0.5 mg/cm3; 0.33 mg/cm3; 0.17 mg/cm3; 0.09 mg/cm3 and the control group without metal addition. The release of progesterone by granulosa cells was assessed by R1A. The release of steroid hormone P4 was significantly (p < 0.05) inhibited after Pb administration at the dose l .0 mg/cm3. Secretion of P4 by granulosa cells was decreased by Ag addition at the doses 0.5 mg/cm3; 0.33 mg/cm3; 0.17 mg/cm3 and 0.09 mg/cm3. Significant (p < 0.05) increase of P4 release after Mo addition was found. Data obtained from these in vitro studies indicate new knowledge that release of steroid hormone progesterone by porcine granulosa cells is associated with doses and variety of Chemical treatments (Pb, Ag, Mo). Obtained data indicate the interference of these endocrine disruptors in the pathways of steroidogenesis of porcine oyarian granulosa cells.
    Zbadano wpływ ołowiu (Pb), srebra (Ag) i molibdenu na wydzielanie progesteronu (P4) przez komórki ziarniste jajników świni. Komórki ziarniste inkubowano w obecności octanu ołowiu, azotanu srebra i molibdenianu amonu przez 18 godzin: 1.0 mg/cm3; 0.5 mg/cm3; 0.33 mg/cm3; 0.17 mg/cm3; 0.09 mg/cm3. Założono również grupę kontrolną komórek ziarnistych, które nie były eksponowane na jony metali. Wydzielanie progesteronu przez komórki ziarniste zostało zbadane metodą RIA. Wydzielanie sterydu P4 przez komórki ziarniste zostało zahamowane w sposób statystycznie istotny (p < 0.05) przez ołów podany w dawce l mg/cm3. Wydzielenie P4 zmniejszyło się w obecności Ag w stężeniach 0.5 mg/cm3; 0.33 mg/cm3; 0.17 mg/cm3 i 0.09 mg/cm3. Stwierdzono statystycznie istotny wzrost wydzielania P4 po podaniu Mo (p < 0.05). Wyniki uzyskane w przedstawionym eksperymencie prowadzonym in vitro wykazują, że wydzielanie progesteronu przez komórki ziarniste jajników świni może być modyfikowane przez różne czynniki chemiczne (Pb, Ag, Mo) stosowane w zróżnicowanych dawkach. Odnotowane zjawisko jest prawdopodobnie związane z zaburzeniem niektórych szlaków steroidogenezy zachodzącej w komórkach ziarnistych jajników świni.
    Źródło:
    Ecological Chemistry and Engineering. A; 2010, 17, 1; 107-118
    1898-6188
    2084-4530
    Pojawia się w:
    Ecological Chemistry and Engineering. A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heavy minerals from sedimentary rocks of the Malcov Formation and their palaeogeographic implications for evolution of the Magura Basin (Western Carpathians, Slovakia) during the Late Eocene–Late Oligocene
    Autorzy:
    Bónová, K.
    Bóna, J.
    Kováčik, M.
    Laurinc, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059937.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Western Carpathians
    Magura Nappe
    Malcov Formation
    provenance
    heavy minerals
    mineral composition
    Opis:
    Detrital heavy minerals separated from the Malcov Fm. deposits (Magura Nappe) indicate their source rocks and areas. The heavy mineral assemblages predominantly consist of garnet, zircon, tourmaline, rutile and Cr-spinel. EPMA analyses reveal a few groups of garnets: zoned and unzoned Grs almandines, Prp-Sps almandines, unzoned Prp almandines, almandines, Sps almandines and rare zoned spessartine grains (~85 mol% Sps). The garnet composition indicates that gneisses, mica schists, amphibolites and granites were their main source rocks, but low-grade metapelites with Mn mineralisation probably contributed as well. The detrital dravitic tourmalines were mostly derived from paragneisses and mica schists. Cr-spinel indicates a volcanic source. Based on heavy mineral assemblages, coupled with palaeoflow analysis, we conclude that the Marmarosh Massif and Fore-Marmarosh Suture are the most probable source areas. Aditionally, the Malcov sedimentary basin was supplied by material from the crystalline complexes of the Tisza Mega-Unit and Pieniny Klippen Belt (PKB). The bulk of the clastic deposits comprise classical turbidites. These lithofacies were deposited from either turbidity currents or from concentrated density flows. The palaeoflow record is varied and highlights the contribution of sedimentary material from several directions and/or diversion of gravity currents from the main flow direction (SE–NW). The marginal parts of the Malcov sub-basins were formed of deformed and uplifted older formations of surrounding units of the Magura Nappe and PKB (submerged ridges). Older (Late Cretaceous to Eocene) flysch sediments may have been redeposited from these ridges to neighbouring sub-basins in a transverse direction (NE–SW).
    Źródło:
    Geological Quarterly; 2016, 60, 3; 675--694
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of foliar application of the biostimulator Mg-Titanit on the formation of winter oilseed rape phytomass and its titanium content
    Autorzy:
    Kováčik, P.
    Šimanský, V.
    Wierzbowska, J.
    Renčo, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/962759.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    The objective of the following three-year small-plot experiments was to determine the impact of a dose and application date of the biostimulator Mg-Tytanit (MgTi) on the formation of winter oilseed rape phytomass and its titanium cont ent. In the trial the biostimulant Mg-Tytanit containing 8.5 g of titanium in 1 liter was used. The experiment consisted of 5 treatments: 0 – control treatment without MgTi; 2xTi0.2 – two applications of MgTi in the dose of 0.2 dm3 ha-1; 3xTi0.2 – three applications of MgTi in the dose of 0.2 dm3 ha-1; 2xTi0.4 – two applications of MgTi in the dose of 0.4 dm3 ha-1; 3xTi0.4 – three applications of MgTi in the dose of 0.4 dm3 ha-1. The BS was applied in spring during two or three different growth stages: BBCH 50, BBCH 59, BBCH 66. The first plant sampling was carried out shortly before the first application of BS (BBCH 50). The second, third and fourth sampling were taken 2 – 3 weeks after the application of Mg-Tytanit (BBCH 59, BBCH 66, BBCH 71). The results showed that the biostimulator MgTi, regardless of its dose and application date, resulted in a higher weight of the aerial and underground phytomass. All the MgTi applications had impact on the winter oilseed rape yield increase. The seed yield was increased by 0.3 to 0.63 t ha-1. Higher yields were achieved in the treatments where MgTi was applied three times in comparison with the treatments, where it was used twice. The oil content in rape seeds was increased significantly only if MgTi was used in the total doses 0.8 and 1.2 dm3 ha-1 in the single application dose 0.4 dm3 ha-1. The oil content value was increased by 0.94 % and by 0.82 %. The oil production per hectare was increased after each use of MgTi, i.e. regardeless of the dose and date of its application. The highest Ti content in the aerial phytomass was 68.5 mg kg-1 and in the underground phytomass it was 247.1 mg kg-1.
    Źródło:
    Journal of Elementology; 2016, 21, 4
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromian spinels from the Magura Unit (Western Carpathians, Eastern Slovakia) : their petrogenetic and palaeogeographic implications
    Autorzy:
    Bónová, K.
    Špisiak, J.
    Bóna, J.
    Kováčik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060358.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Western Carpathians
    Magura Basin
    provenance
    detrital chromian spinel
    geochemistry
    Opis:
    Detrital chromian spinels in sedimentary rocks provide much information concerning the tectonics of their parental ultrabasic rocks. Chromian spinels occurring in the Eocene to Oligocene depos its from the Magura Nappe were exam i ned to provide some constraints on the history of the Magura Basin. The Magura Nappe is a part of the Flysch Belt belonging to the External Western Carpathians. The Magura Nappe is separated by a narrow zone associated with the Pieniny Klippen Belt and is divided into three principal tectono-lithofacies units (from the S to N): the Krynica, Bystrica and Rača units. Cr-spinel is a common accessory mineral (2.3-5.9 vol% of heavy mineral spectra) in the siliciclastic rocks of the Rača and Krynica units. In terms of texture and chemical composition, two types of Cr-spinels were recognized: unaltered and altered. Unaltered spinels were found to contain silicate inclusions such as chromio-pargasite, enstatite, diopside, pargasite, plagioclase and olivine (forsterite). The chromian spinels show wide variations in compositional parameters such as Cr# (0.3-0.7), Mg# (0.3-0.7), TiO2 (<0.03-1.9 wt.%) and Fe2+/Fe3+ (2.5-13) whereas the differences between the Rača and Krynica units are in- significant. These parameters suggest a peridotitic and volcanic origin of the spinels, respectively. The ophiolite source consisting of harzburgitic mantle peridotites was developed mainly in a supra-subduction zone setting; volcanic spinels indicate an origin in mid-ocean ridge basalts, back-arc basin basalts and sporadically in ocean-island basalts. Concerning their geochem i cal features, we propose that during the Eocene to Early Oligocene, the ophiolitic detritus in the eastern part of the Magura Basin deposits may have been derived from a source area located in the Fore-Marmarosh Suture Zone (Eastern Carpathians) that is considered an equivalent of the Black Flysch and Ceahlau units. Some Cr-spinels found in the Eocene sedimentary successions may have resedimented from older Late Cretaceous-Paleocene formations of the Magura Unit, which are considered as reworked sedimentary material from the Pieniny Klippen Belt.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 3--18
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Different Doses of N Fertilization on the Parameters of Soil Organic Matter and Soil Sorption Complex
    Autorzy:
    Šimanský, V.
    Kováčik, P.
    Jonczak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/124019.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    nitrogen
    fertilization
    Luvisol
    soil organic matter
    hydrolytic acidity
    cation exchange capacity
    Opis:
    Mineral N fertilizer application may have an effect on soil organic matter and other soil parameters. Therefore, we studied the effects of different doses of N fertilization on soil organic matter and chemical properties of Haplic Luvisol in the locality of Dolná Malanta (Slovakia) during 2014–2016. Soil samples were collected from the plots exposed to the following treatments: 1. N0 – no N fertilization as control during 2014–2016, 2. N40 – N fertilizer at the rate of 40 kg N ha–1 in 2014 and 2016, 3. N80 – N fertilizer at the rate of 80 kg N ha–1 in 2014 and 2016, 4. N160 – N fertilizer at the rate of 160 kg N ha–1 in 2015, and 5. N240 – N fertilizer at the rate of 240 kg N ha–1 in 2015. The results showed that in N80 the soil organic carbon (SOC) content increased by 32% in comparison to N0. The addition of 80 kg ha-1 of N significantly decreased the humic substances (HS) content in the soil by 16% compared to N0. The higher doses of N fertilization 80 rather than 40 kg ha-1 as well as 240 rather than 160 kg ha-1 significantly decreased humus stability. The addition of N fertilization decreased the average values of soil pH. Values of hydrolytic acidity (Ha) increased by 41% and 46% in N40 and N80, respectively than N0, but on the other hand, this one decreased by 36% and 27% in N160 and N240, respectively in comparison to N0. Positive statistically significant correlations were determined between soil pH and SOC in N40 and N80 treatments. The increase of soil pH was connected with higher humus quality in N160 and N240. Negative correlations between humic acids (HA) and sum of basic cations (SBC) and cation exchange capacity (CEC) were observed in N80 < N160 < N240 treatments. Higher values of fulvic acids corresponded with lesser CEC in N80 and N160 treatments. In N160, with increased humus quality, CEC significantly decreased. The same effect was observed in N240. In addition, in N240, we also observed that with increased HA:FA ratio SBC and base saturation significantly decreased.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 3; 104-111
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of vermicompost on biological indicators of the quality of soil under maize in a greenhouse experiment
    Autorzy:
    Makova, J.
    Javorekova, S.
    Elbl, J.
    Medo, J.
    Hricakova, N.
    Kovacik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/15723.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Źródło:
    Journal of Elementology; 2019, 24, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of application of Norway spruce sawdust (Picea abies) on sugar beet growth and yield and on selected soil parameters
    Autorzy:
    Kovacik, P.
    Wierzbowska, J.
    Smolen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192387.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    retardation of plant growth
    lignocellulosic substances
    organic matter
    assimilative
    pigments
    Opis:
    The decrease in application of organic fertilizers into arable soils in Slovakia observed for the past twenty-five years has caused degradation of their physical, chemical and biological parameters. In order to solve this problem, Slovak farmers often add to soil such carbon-rich substances which either pose a risk of increasing the heavy metal content of soil, or whose purchase and use are economically demanding. Meanwhile, sawdust is a cheap and available carbon-rich material. Therefore, the objective of a two-year pot experiment was to determine the impact of sawdust used alone or with added inorganic nitrogen on the parameters of sugar beet yield as well as on some soil parameters. The results proved that the separate application of sawdust in autumn in doses of 3.4 t ha-1 and 6.8 t ha-1 caused the retardation of the growth of sugar beet and the decrease of the total chlorophyll content in leaves during the first 80 days of plant growth and development. This application did not have the significant impact on the root yield, but it increased the sugar content of sugar beet roots. The roots contained less a-amino nitrogen and more potassium. The number of nitrogen-fixing bacteria of genus Azotobacter chroococcum (AzCh) and the quantity of organic carbon in soil increased. The addition of mineral nitrogen fertilizer in a dose of 60 kg ha-1 into sawdust before sugar beet sowing in spring lowered or even eliminated the negative impact of sawdust itself on the beet growth and the content of total chlorophyll. It also increased the root yield. This addition had positive impact on the number of bacteria of the genus AzCh and the quantity of organic carbon in soil.
    Źródło:
    Journal of Elementology; 2020, 25, 3; 1141-1154
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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