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Wyszukujesz frazę "Ruman, T." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Silver nanoparticles deposited on calcium hydrogenphosphate – silver phosphate matrix; biological activity of the composite
    Autorzy:
    Szmuc, K.
    Kus-Liskiewicz, M.
    Szyller, Ł.
    Szmuc, D.
    Stompor, M.
    Zawlik, I.
    Ruman, T.
    Wołowiec, S.
    Cebulski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779650.pdf
    Data publikacji:
    2019
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    silver nanoparticles
    composite
    calcium hydrogenphosphate matrix
    electron microscopy
    mass spectrometry
    Opis:
    The composite containing nanosilver uniformly deposited on matrix composed of CaHPO4  x 2H2 O (brushite, ca 89 mass %), CaHPO4  (monteonite, ca 9.5 mass%), and Ag3 PO4  (0.5 mas%) was obtained by addition of calcium nitrate and silver nitrate aqueous solution at 30:1 Ca:Ag molar ratio into excess of (NH4 )2 PO4  solution at pH 5.0 – 5.5. The isolated solid was characterized by STEM, XRD, and LDI mass spectrometry. It has been found that nanosilver was uniformly distributed within composite as <10 nm diameter sized nanoparticles. Determination of silver by AAS showed that 60% of silver is present as Ag(0) nanoparticles, the present as matrix Ag3 PO4  as identified by XRD method. The composite showed strong growth inhibition in E. coli and P. aeruginosa strains, and moderate towards S. aureus. The C. albicans cells were the most resistant to the tested material, although still composite was moderately cytostatic for the yeast.
    Źródło:
    Polish Journal of Chemical Technology; 2019, 21, 2; 6-13
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie nanocząstek srebra w laserowej spektrometrii mas oraz w obrazowaniu MS : przegląd
    Application of silver nanostructures in laser desorption/ionization mass spectrometry and mass spectrometry imaging
    Autorzy:
    Sekuła, J.
    Nizioł, J.
    Ruman, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/172137.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki niskocząsteczkowe
    spektrometria mas
    obrazowanie spektrometrią mas
    matryca
    układy bezmatrycowe
    nanocząstki srebra
    low molecular weight compounds
    mass spectrometry
    mass spectrometry imaging
    matrices
    matrix free-system
    silver nanoparticles
    Opis:
    Metallic nanoparticles, especially silver nanoparticles, have attracted much attention due to their unique physical, chemical and opto-electronic properties. Silver nanoparticles have been successfully applied as a matrix replacement for the laser desorption/ionization time-of-flight mass spectrometry (LDI-ToF-MS). Silver nanoparticles (AgNPs) can efficiently absorb ultraviolet laser radiation, transfer energy to the analyte and promote analyte desorption, but also constitute a source of silver ions suitable for analyte cationisation. Nanoparticles, producing spectra with highly reduced chemical background in the low m/z region, are perfectly suited for low-molecular weight compound analysis and imaging. AgNPs have been demonstrated to allow efficient capture of different chemical compounds (including amino acids, cholesterol, fatty acids) on their surface, thus efficiently promoting their desorption and gas phase cationisation. The minimum detectable amount for those organic and biological molecules is often in the fmol range [23]. Despite the fact that scientists have developed a variety of methods for the synthesis of silver nanoparticles, there are still problems with obtaining surfaces with nanoparticles of high durability and chemical purity. Recently, a successful application of cationic silver nanoparticles (AgNPs), which were placed on MALDI targets for highly sensitive detection of d-ribose at attomolar levels as well as analysis of biological samples such as urine and blood serum [51] was shown. The application of new 109AgNPET surface has been presented with examples of analysis of nucleosides and nucleic bases [60]. One of the main directions of development of LDI-MS is the imaging mass spectrometry (MSI), enabling the visualization of surface distribution of biological samples. The critical limitations of the spatial resolution of MALDI-MSI are the size of the organic matrix crystals and the analyte migration during the matrix application process. To overcome these problems, researchers tried to use nanoparticles as substitutes of organic matrices. In 2013 Ruman group presented that direct contact of the analysed object with Ag nanoparticle-covered target permits direct surface transfer of chemical compounds. The active surface becomes then a “chemical photograph” of an object and allows MS analysis and MS imaging [68].
    Źródło:
    Wiadomości Chemiczne; 2016, 70, 7-8; 519-539
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water level fluctuations in the Turawa Reservoir in relation to the tourist use of the water body
    Autorzy:
    Jankowski, Andrzej T.
    Ruman, Marek
    Górniak, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/2029808.pdf
    Data publikacji:
    2008-06-01
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    limnology
    water reservoirs
    retention changes
    tourism
    Opis:
    The aim of the paper is to assess the fluctuations of water levels in the Turawa Reservoir (50° 43' N, 18° 08' E) in relation to the tourist use of the water body. The reservoir is situated within the macroregion of the Silesian Lowland in the mesoregion of the Opole Plain. In administrative terms, the reservoir is situated in the pole Province within the borough of Turawa. In hydrological terms, in turn, it is situated in the catchment area of the Mała Panew river, which belongs to the basin of the Odra river. The Turawa Reservoir was opened for use in 1938, and in 1948 it was filled with water to its maximum for the first time. At present, the surface area of the reservoir, when it is filled with water to its maximum, is about 20.8 km2, its volume 99.5 mln m3, and its depth exceeds 13 meters. In the period of hydrological years 1976-2000 water levels in this reservoir were characterized by high, unnoticed in natural conditions, amplitudes of changes reaching 6.99 m. Anthropogenically stimulated fluctuations in the water level result in conflicts in terms of tasks and functions that the Turawa Reservoir was designed for. Changes in the level of the water surface in the Turawa Reservoir resulted from the impact of the natural factors (thaw and rainfall related high water levels), as well as anthropogenic ones (the need to improve sailing conditions, water supply for industrial and municipal needs). Decreasing the fluctuations of water levels in the Turawa Reservoir is necessary in order to maintain its tourist-recreational functions and keep the ecological condition of its waters at the appropriate level.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2008, 13; 133-144
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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