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Wyszukujesz frazę "long-chain polyprenol" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Plant long-chain polyprenols as chemotaxonomic markers
Autorzy:
Roslinska, M
Walinska, K.
Swiezewska, E.
Chojnacki, T.
Powiązania:
https://bibliotekanauki.pl/articles/41540.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
Magnoliaceae
long-chain polyprenol
chemotaxonomy
Tiliaceae
Lauraceae
leaf
plant
Opis:
The occurrence of long-chain polyprenols in leaves of plants of Lauraceae, Tiliaceae and Magnoliaceae families was studied. Separation of groups of polyprenols differing in the size of molecules was performed by thin-layer chromatography. In all studied species long-chain polyprenols were detected. The total polyprenol content in leaves reached values as high as 3% of their dry weight. In the studied species belonging to Lauraceae family a fraction of polyprenols composed of 10-14 isoprene units was present. In species of Tiliaceae and Magnoliaceae polyprenols composed of 9-12 and 10-12 isoprene units were present, respectively. Differences in polyprenol profile characteristic for each family studied were observed. These results were confirmed by HPLC. The structure of these polyprenols was examined by NMR spectrometry and in representative species studied polyprenols exibited the typical poly-cis structure. The effect of insolation on the rate of accumulation of polyprenols was documented.
Źródło:
Dendrobiology; 2002, 47
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of hexadecaprenol on molecular organisation and transport properties of model membranes.
Autorzy:
Janas, Teresa
Nowotarski, Krzysztof
Gruszecki, Wiesław
Janas, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/1044307.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
voltammetric studies.
bilayer lipid membranes
Langmuir film studies
long-chain polyprenol
lipid monolayer
Opis:
The Langmuir monolayer technique and voltammetric analysis were used to investigate the properties of model lipid membranes prepared from dioleoylphosphatidylcholine (DOPC), hexadecaprenol (C80), and their mixtures. Surface pressure- molecular area isotherms, current-voltage characteristics, and membrane conductance-temperature were measured. Molecular area isobars, specific molecular areas, excess free energy of mixing, collapse pressure and collapse area were determined for lipid monolayers. Membrane conductance, activation energy of ion migration across the membrane, and membrane permeability coefficient for chloride ions were determined for lipid bilayers. Hexadecaprenol decreases the activation energy and increases membrane conductance and membrane permeability coefficient. The results of monolayer and bilayer investigations show that some electrical, transport and packing properties of lipid membranes change under the influence of hexadecaprenol. The results indicate that hexadecaprenol modulates the molecular organisation of the membrane and that the specific molecular area of polyprenol molecules depends on the relative concentration of polyprenols in membranes. We suggest that hexadecaprenol modifies lipid membranes by the formation of fluid microdomains. The results also indicate that electrical transmembrane potential can accelerate the formation of pores in lipid bilayers modified by long chain polyprenols.
Źródło:
Acta Biochimica Polonica; 2000, 47, 3; 661-673
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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