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    Wyświetlanie 1-4 z 4
    Tytuł:
    Application of 1H-NMR relaxometry to the determination of the water content in clay soils
    Zastosowanie metody NMR do określenia wilgotności w gruntach spoistych
    Autorzy:
    Nartowska, E.
    Kozłowski, T.
    Kolankowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/402547.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    water content
    clay soils
    NMR methods
    FID Signal
    wilgotność
    grunty spoiste
    metody NMR
    sygnał FID
    Opis:
    The NMR technique is widely used in polymer, chemical, and agrifood industries, as well as in many other fields of science and technology. This work presents results from the use of FID (Free Induction Decay) application to determine the water content in clay soil samples. The widely used oven-drying method is time-consuming and precludes using the same sample to another test, because drying process damages the internal structure of soil. Three clay soils, characterized by high surface area, were used in the research and six to eight samples for each soil were tested. The obtained dependence curve between FID Signal Intensities and mass of water was characterized by a high correlation coefficient (R2 = 0.97). The curve can be used to determine the mass of water present in clay soil sample on the basis of FID Signal Intensity. Such approach allows 1H-NMR relaxometry to be applied for the determination of water content in soil samples in a fast and non-destructive way.
    Źródło:
    Structure and Environment; 2015, 7, 4; 189-193
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of the soil granulometric composition on the FID (free induction decay) signal intensity in NMR tests
    Wpływ składu granulometrycznego gruntów na intensywność sygnału FID (Free Induction Decay) w badaniach NMR
    Autorzy:
    Nartowska, E.
    Kozłowski, T.
    Kolankowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/402181.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    non cohesive soil
    well and poorly sorted soil
    granulometric composition
    NMR methods
    FID Signal cooling
    grunt niespoisty
    dobrze i źle posortowane gleby
    skład granulometryczny
    metody NMR
    Opis:
    The influence of the soil granulation, grain diameter and the soil type on the FID signal intensity is presented. The FID signal intensity is used to determine the water content in soil sample by the use of the NMR spectrometry. Eighty five samples taken from four different soils (3 sand,1 sandy silt) were tested. The samples were characterized by different masses and water contents. The results of the FID signal intensity were compared to the mass of water in soils calculated by empirical formula obtained for clay soils and the mass of water obtained by the oven-drying method. The empirical formula using FID Signal Intensity can be used to calculate the mass of water in every soil regardless of its type. The type of soil, grain diameter and granulation do not appear to influence the FID Signal Intensity value. The factors that influence the FID Signal Intensity are the mass of water in soil, the water content in case of poorly sorted soils and the mass of soil sample in well sorted soils. The statistical analysis were conducted using Statistica 9.1 software.
    Źródło:
    Structure and Environment; 2016, 8, 2; 111-115
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conformational studies of tachykinin peptides using NMR spectroscopy
    Autorzy:
    Rodziewicz, S.
    Xiao-Fei, Qi.
    Rolka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954059.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    conformational analysis
    tachykinin peptides
    NMR spectroscopy
    Scyliorhinin II
    molecular dynamics calculation methods
    DMSO
    Opis:
    Conformational analysis of two tachykinin family peptides: Scyliorhinin I (ScyI) and Scyliorhinin II (ScyII) was carried out by 1D- and 2D-NMR (DQF-COSY, TOCSY, HMQC, HMBC, NOESY and ROESY) and molecular dynamics calculation methods in water and DMSO. Scyliorhinin I is an equipotent agonist of NK-1 and NK-2 tachykinin receptors and Scyliorhinin II is a selective agonist of the NK-3 tachykinin receptor. In DMSO, two groups of conformations (major and minor) were obtained for both peptides based on the experimental data. The conformations proposed for ScyI represent a folded structure, which show certain similarities to the structures reported for other NK-1 and NK-2 tachykinin agonists. In water ScyII displays a flexible, extended structure, whereas in DMSO the structure is more compact and in the fragment from the centre to the C-terminus several beta -turns may be present.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 1; 47-53
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oznaczanie związków fosforu w matrycach roślinnych
    Determination of phosphorus compounds in plant tissues
    Autorzy:
    Żyszka-Haberecht, Beata
    Wieczorek, Dorota
    Lipok, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1413210.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    fosfor
    tkanki roślinne
    oznaczanie
    metody analityczne
    NMR
    phosphorus
    plant tissues
    determination
    analytical methods
    Opis:
    The variety of the chemical forms of phosphorus compounds occurring in plant tissues, accompanied by the complexity of the chemical composition of plants as the analytical matrices, are the reasons why there is no one, the best answer, how those individual substances may be determined qualitatively and quantitatively. Interestingly, if the subject of determination is the total phosphorus content, the spectrum of effective methods and techniques seems to be impressive. However, in case of spectrophotometric measurements and classical variants of absorption (FAAS) or emission (ICP-AES/ ICP-OES) spectrometry techniques, it is necessary at first to isolate various phosphorus forms from the matrix, and then to mineralize them prior determination. The development of combined methods e.g. ETV-ICP- AES or HR-ETAAS, does allow the isolation of the phosphorus analyte and its detection in a kind of “one step” analytical procedure, directly in plant tissues. Similar benefits, while maintaining the sensitivity of determinations, are brought by the use of XRF, SIMS or nanoSIMS - more expensive techniques of imaging the presence of phosphorus in biological matrices. In turn, the application of nuclear magnetic resonance spectroscopy, especially the 31P NMR technique is thought to be the most universal approach. Using this technique and being aware of higher limit of detection, it is possible to determine various plant phosphorus compounds qualitatively and quantitatively, at the same time.
    Źródło:
    Wiadomości Chemiczne; 2021, 75, 7-8; 1017-1038
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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