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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of sperm concentration in an ejaculate on morphometric traits of spermatozoa in Duroc boars
    Autorzy:
    Kondracki, S.
    Wysokinska, A.
    Iwanina, M.
    Banaszewska, D.
    Sitarz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/31784.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sperm concentration
    ejaculate
    morphometry
    spermatozoon
    Duroc boar
    boar
    morphology
    animal reproduction
    mammal
    Opis:
    The experimental material consisted of 75 ejaculates collected form 8 Duroc boars. The ejaculates were divided into three groups according to sperm concentration in an ejaculate. An ejaculate was obtained from each boar monthly and it was used to make microscopic preparations to examine spermatozoa morphology. In each preparation morphometric measurements were taken of fifteen randomly selected spermatozoa characterized by normal morphology. The following measurements of spermatozoa were taken: length and width of the spermatozoa head, head area, length of the flagellum, perimeter of the spermatozoon head and total spermatozoon length. The results were used to calculate indicators of spermatozoa morphology. Moreover, assessments were made of frequency of morphological defects to isolate spermatozoa with primary and secondary abnormalities following the Blom classification system. It was found that the concentration of spermatozoa in the ejaculate influenced the morphometric characteristics of spermatozoa. Ejaculates with low sperm concentrations are characterized by larger spermatozoa as compared to ejaculates with high sperm concentrations. However, sperm concentration in the ejaculate does not much influence the shape of spermatozoa.
    Źródło:
    Polish Journal of Veterinary Sciences; 2011, 14, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physicochemistry, morphology and leachability of selected metals from post-galvanized sewage sludge from screw factory in Łańcut, SE Poland
    Autorzy:
    Galas, D.
    Kalembkiewicz, J.
    Sitarz-Palczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/100774.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Śląski. Wydział Nauk o Ziemi
    Tematy:
    cynkowanie
    osad ściekowy
    metale ciężkie
    post-galvanized sewage sludge
    leachability
    heavy metals
    Opis:
    Morphology, physicochemical properties, chemical composition of post-galvanized sewage sludge from Screw Factory in Łańcut, leachability and mobility of metals has been analyzed. The analyses with the use of scanning electron microscope with an adapter to perform chemical analysis of microsites (EDS) showed that the material is characterized by a high fragmentation and a predominant number of irregularly shaped grains. The sewage sludge is alkaline with a large loss of ignition (34.6%) and small bulk density (< 1 g/cm3). The EDS analyses evidenced presence of oxygen, silicon, calcium, chromium, iron and zinc in all examined areas, and presence of manganese and copper in selected areas indicating a non-uniform distribution of metals in the sewage sludge. Within one-stage mineralization and FAAS technique a predominant share of calcium, zinc and iron in terms of dry matter was recorded in the sewage sludge. The contents of Co, Cr, Cu, K, Mn, Ni and Pb in sewage sludge are below 1%. Evaluation of mobility and leaching of metals in sewage sludge was carried out by means of two parameters: accumulation coefficient of mobile fractions and leaching level related to the mass solubility of sewage sludge. The results indicate that the short-term or long-term storage of not inactivated post-galvanized sewage sludge can result in release of metals.
    Źródło:
    Contemporary Trends in Geoscience; 2016, 5, 2; 83-91
    2299-8179
    Pojawia się w:
    Contemporary Trends in Geoscience
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Content of Selected Heavy Metals in Samples of Polish Honeys
    Autorzy:
    Sitarz-Palczak, E.
    Kalembkiewicz, J.
    Galas, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/123800.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    bee products
    heavy metals
    FAAS
    Opis:
    This paper presents the result of the determination of the total content of Cu, Pb and Zn by the method of atomic absorption spectrometry with atomization in an air-acetylene flame in Polish honeys samples. The research material was a honeydew, monofloral honey and buckwheat honey. For the mineralization of samples, the following solutions were applied: 1) HNO3(conc), 2) HNO3(conc) and H2O2(conc) in the volume ratio equal to 4:1 and 3:1. On the basis of the results and recommended food standards the percentage of the recommended dietary allowances (RDA) in connection with the consumption of 100 g of product were estimated. To verify the results validation of analytical method used was carried out. It was included defining the following validation parameters values: the limit of detection and quantification; linearity and measurement range; repeatability and accuracy of the results. The contamination of the analyzed honeys by Pb is higher than the acceptable level of contamination of this element. The highest contents of Cu and Zn were characterized by monofloral honeys.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 3; 130-138
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of Poly(Acrylic Acid-co-Maleic Acid) Sodium Salt Intercalated Montmorillonite
    Autorzy:
    Grabowska, B.
    Cukrowicz, S.
    Kurleto-Kozioł, Ż.
    Kaczmarska, K.
    Drożyński, D.
    Sitarz, M.
    Bobrowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382199.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    hybrid materials
    montmorillonite
    lustrous carbon
    intercalation
    odlewnia
    materiały hybrydowe
    montmorylonit
    węgiel
    Opis:
    The intercalation into interlayer spaces of montmorillonite (MMT), obtained from natural calcium bentonite, was investigated. Modification of MMT was performed by the poly(acrylic acid-co-maleic acid) sodium salt (co-MA/AA). Efficiency of modification of MMT by sodium salt co-MA/AA was assessed by the infrared spectroscopic methods (FTIR), X-ray diffraction method (XRD) and spectrophotometry UV-Vis. It was found, that MMT can be relatively simply modified with omitting the preliminary organofilisation – by introducing hydrogel chains of maleic acid-acrylic acid copolymer in a form of sodium salt into interlayer galleries. A successful intercalation by sodium salt of the above mentioned copolymer was confirmed by the powder X-ray diffraction (shifting the reflex (001) originated from the montmorillonite phase indicating an increase of interlayer distances) as well as by the infrared spectroscopy (occurring of vibrations characteristic for the introduced organic macromolecules). The performed modification causes an increase of the ion exchange ability which allows to assume that the developed hybrid composite: MMT-/maleic acid-acrylic acid copolymer (MMT-co- MA/AA) can find the application as a binding material in the moulding sands technology. In addition, modified montmorillonites indicate an increased ability for ion exchanges at higher temperatures (TG-DTG, UV-Vis). MMT modified by sodium salt of maleic acid-acrylic acid copolymer indicates a significant shifting of the loss of the ion exchange ability in the direction of the higher temperature range (500–700°C).
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 67-75
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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