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Wyszukujesz frazę "1H-NMR" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Application of 1H and 31P NMR to topological description of a model of biological membrane fusion Topological description of a model of biological membrane fusion
    Autorzy:
    Janiak-Osajca, Agnieszka
    Timoszyk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1039735.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    vesicle
    topology
    fusion
    31P-NMR
    1H-NMR
    Opis:
    The process of biological membrane fusion can be analysed by topological methods. Mathematical analysis of the fusion process of vesicles indicated two significant facts: the formation of an inner, transient structure (hexagonal phase - HII) and a translocation of some lipids within the membrane. This shift had a vector character and only occurred from the outer to the inner layer. Model membrane composed of phosphatidylcholine (PC), phosphatidylethanolamine (PE) and phosphatidylserine (PS) was studied. 31P- and 1H-NMR methods were used to describe the process of fusion. 31P-NMR spectra of multilamellar vesicles (MLV) were taken at various temperatures and concentrations of Ca2+ ions (natural fusiogenic agent). A 31P-NMR spectrum with the characteristic shape of the HII phase was obtained for the molar Ca2+/PS ratio of 2.0. During the study, 1H-NMR and 31P-NMR spectra for small unilamellar vesicle (SUV), which were dependent on time (concentration of Pr3+ ions was constant), were also recorded. The presence of the paramagnetic Pr3+ ions permits observation of separate signals from the hydrophilic part of the inner and outer lipid bilayers. The obtained results suggest that in the process of fusion translocation of phospholipid molecules takes place from the outer to the inner layer of the vesicle and size of the vesicles increase. The NMR study has showed that the intermediate state of the fusion process caused by Ca2+ ions is the HII phase. The experimental results obtained are in agreement with the topological model as well.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 2; 219-224
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    _1H NMR spectra of trypsin inhibitors from seeds of Cucurbitaceae plants. Resonance signals of methyl groups.
    Autorzy:
    Siemion, Ignacy
    Sobczyk, Katarzyna
    Wilusz, Tadeusz
    Polanowski, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1046025.pdf
    Data publikacji:
    1984
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Źródło:
    Acta Biochimica Polonica; 1984, 31, 2; 207-215
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of acylglycines in urine by 1H and 13C NMR for the diagnosis of inborn metabolic diseases
    Autorzy:
    Gryff-Keller, Adam
    Kraska-Dziadecka, Anna
    Kubica, Dominika
    Powiązania:
    https://bibliotekanauki.pl/articles/1039667.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    13C NMR
    urinalysis
    inherited metabolic disease
    1H NMR
    acylglycine
    Opis:
    A range of inborn metabolic diseases result in abnormal accumulation of acylglycines in body fluids. Therefore, detection of these metabolites is important for diagnostic purposes. 1H and 13C NMR spectroscopies have successfully been applied for both qualitative and quantitative determinations of various acylglycines in urine samples from patients suffering from metabolic diseases connected with excretion of these compounds. Various acylglycines were identified in test urine samples from 15 patients suffering from five different metabolic diseases, providing information which could be crucial for their diagnoses. The paper reports complete 1H and 13C NMR data of 11 acylglycines, which is essential for this type of NMR analysis of body fluids. NMR spectroscopy has been proven effective in determining the presence as well as the levels of acylglycines in urine. The proposed method is rapid, simple and requires minimal sample treatment.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 613-617
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of a wide spectrum of inherited metabolic disorders by 13C NMR spectroscopy
    Autorzy:
    Bal, Dominika
    Kraska-Dziadecka, Anna
    Gradowska, Wanda
    Gryff-Keller, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1040823.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    urine
    13C NMR
    inherited metabolic disease
    1H NMR
    marker metabolite
    Opis:
    High-resolution 1H NMR spectroscopy of body fluids has proved to be very useful in diagnostics of inherited metabolic diseases, whereas 13C NMR remains almost unexploited. In this paper the application of 13C NMR spectroscopy of fivefold concentrated urine samples for diagnosis of selected metabolic diseases is reported. Various marker metabolites were identified in test urine samples from 33 patients suffering from 10 different diseases, providing information which could be crucial for their diagnoses. Spectra were accumulated for 2 h or overnight when using spectrometers operating at 9.4 or 4.7 T magnetic fields, respectively. Interpretation of the measurement results was based on a comparison of the peak positions in the measured spectrum with reference data. The paper contains a table with 13C NMR chemical shifts of 73 standard compounds. The method can be applied individually or as an auxiliary technique to 1H NMR or any other analytical method.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 107-118
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Translocation of polysialic acid across model membranes: Kinetic analysis and dynamic.
    Autorzy:
    Janas, Teresa
    Krajiński, Henryk
    Timoszyk, Anna
    Janas, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1044181.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    polysialic acid
    1H-NMR
    electrical equivalent circuit
    polycation flux
    polyanion flux
    lipid bilayers
    membrane transport
    Opis:
    Transmembrane translocation of polyion homopolymers takes place in the case of polyanionic polysialic acid (polySia), polyanionic polynucleotides and polycationic polypeptides. The purpose of this work was to determine the role of membrane electrical parameters on the kinetics of polyion translocation, the influence of polysialic acid on ion adsorption on positively charged membrane surface and the dynamics of the phospholipid hydrocarbon chains and choline group by using 1H-NMR. The analysis of polyion translocation was performed by using the electrical equivalent circuit of the membrane for the initial membrane potential equal to zero. The changes in polysialic acid flux was up to 75% after 1 ms in comparison with the zero-time flux. Both a decrease of membrane conductance and an increase of polyion chain length resulted in the diminution of this effect. An increase of praseodymium ions adsorption to positively charged liposomes and an increase of the rate of segmental movement of the -CH2 and -CH3 groups, and the choline headgrup of lipid molecules, was observed in the presence of polySia. The results show that the direction of the vectorial polyion translocation depends both on the membrane electrical properties and the degree of polymerization of the polymer, and that polysialic acid can modulate the degree of ion adsorption and the dynamics of membrane lipids.
    Źródło:
    Acta Biochimica Polonica; 2001, 48, 1; 163-173
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ^1H and ^13C NMR characteristics of the anticancerous derivative of acridine: Ledakrin C-283 (nitracrine)
    Autorzy:
    Wieczorkiewicz, Teresa
    Lubas, Barbara
    Siatecki, Zdzisław
    Kozłowski, Henryk
    Powiązania:
    https://bibliotekanauki.pl/articles/1046085.pdf
    Data publikacji:
    1983
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Źródło:
    Acta Biochimica Polonica; 1983, 30, 1; 71-82
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of 2-[2-nitro-4-(trifluoromethyl)benzoyl]- cyclohexane-1,3-dione metabolites in urine of patients suffering from tyrosinemia type I with the use of 1H and 19F NMR spectroscopy
    Autorzy:
    Szczeciński, Przemysław
    Lamparska, Diana
    Gryff-Keller, Adam
    Gradowska, Wanda
    Powiązania:
    https://bibliotekanauki.pl/articles/1040682.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    tyrosinemia
    NMR
    NTBC metabolites
    Opis:
    Organic extracts of six urine samples from children treated with nitisinone, a medicine against tyrosinemia type I, were investigated by 1H and 19F NMR spectroscopy. The presence of unchanged 2-[2-nitro-4-(trifluoromethyl)benzoyl]cyclohexane-1,3-dione (NTBC), 6-hydroxy-2-[2-nitro-4-(trifluoromethyl)benzoyl]cyclohexane-1,3-dione (NTBC-OH) and 2-nitro-4-trifluoromethylbenzoic acid (NTFA) as well as a few other unidentified compounds containing CF3 group was documented.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 4; 749-752
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Differences in metabolic profiles of planktonic and biofilm cells in Staphylococcus aureus - 1H Nuclear Magnetic Resonance search for candidate biomarkers
    Autorzy:
    Junka, Adam
    Deja, Stanisław
    Smutnicka, Danuta
    Szymczyk, Patrycja
    Ziółkowski, Grzegorz
    Bartoszewicz, Marzenna
    Młynarz, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1039470.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Staphylococcus aureus
    biofilm
    NMR
    metabolomics
    glycine-betaine
    Opis:
    Staphylococcus aureus is responsible for many types of infections related to biofilm presence. As the early diagnostics remains the best option for prevention of biofilm infections, the aim of the work presented was to search for differences in metabolite patterns of S. aureus ATCC6538 biofilm vs. free-swimming S. aureus planktonic forms. For this purpose, Nuclear Magnetic Resonance (NMR) spectroscopy was applied. Data obtained were supported by means of Scanning Electron Microscopy, quantitative cultures and X-ray computed microtomography. Metabolic trends accompanying S. aureus biofilm formation were found using Principal Component Analysis (PCA). Levels of isoleucine, alanine and 2,3-butanediol were significantly higher in biofilm than in planktonic forms, whereas level of osmoprotectant glycine-betaine was significantly higher in planktonic forms of S. aureus. Results obtained may find future application in clinical diagnostics of S. aureus biofilm-related infections.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 4; 701-706
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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