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p. 1013-1027
Received: 16 August 2007; in revised form: 19 September 2007 / Accepted: 20 September 2007 / Published: 29 September 2007
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| Download PDF Full-text (1485 KB) Abstract: The antioxidant activity of different Satureja montana L. subsp. kitaibelii extracts was tested by measuring their ability to scavenge reactive hydroxyl radical during the Fenton reaction, using ESR spectroscopy. Also, the influence of these extracts on lipid peroxyl radicals obtained during lipid peroxidation of: (I) sunflower oil (37°C, 3h) inducedby 4,4'-azobis(4-cyanovaleric acid) (ACVA) and (II) liposomes induced by 2,2'-azobis(2-amidino-propane)dihydrochloride (AAPH) was studied. n -Butanol extract had the bestantioxidant activity (100% at 0.5 mg/mL in Fenton reaction system; 89.21% at 5 mg/mL in system I; 83.38% at 5 mg/mL in system II). The antioxidant activities of the extracts significantly correlated with total phenolic content. The antimicrobial activity of Satureja montana L. subsp. kitaibelii extracts was investigated. Petroleum ether, chloroform and ethyl acetate extracts expressed a wide range of inhibiting activity against both gram-positive and gram-negative bacteria.
p. 1028-1038
Received: 6 June 2007; in revised form: 13 September 2007 / Accepted: 14 September 2007 / Published: 29 September 2007
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| Download PDF Full-text (208 KB) Abstract: Ninety-two wines from the southernmost wine-producing region in Hungary(Villány) were analyzed for their polyphenolic content by high performance liquidchromatography (HPLC). Our results show that wine variety or vintage year could not bedistinguished based on polyphenol content, but winery origin could be. Resveratrolconcentration is mainly dependent on variety and vintage year. The “human factor” (i.e.,winemaking style and technology) seems to be more decisive for the polyphenoliccomposition of red wines than other factors, such as variety and vintage year.
p. 1039-1051
Received: 13 July 2007; in revised form: 15 October 2007 / Accepted: 16 October 2007 / Published: 23 October 2007
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| Download PDF Full-text (2578 KB) Abstract: We have isolated ribulose-1,5-bisphosphate-carboxylase/oxygenase (RUBISCO)from the red algae Galdieria Sulphuraria. The protein crystallized in two different crystalforms, the I422 crystal form being obtained from high salt and the P21 crystal form beingobtained from lower concentration of salt and PEG. We report here the crystallization,preliminary stages of structure determination and the detection of the structural phasetransition in the P21 crystal form of G. sulphuraria RUBISCO. This red algae enzymebelongs to the hexadecameric class (L8S8) with an approximate molecular weight 0.6MDa.The phase transition in G. sulphuraria RUBISCO leads from two hexadecamers to a singlehexadecamer per asymmetric unit. The preservation of diffraction power in a phasetransition for such a large macromolecule is rare.
p. 1052-1063
Received: 13 September 2007; in revised form: 27 September 2007 / Accepted: 30 September 2007 / Published: 22 October 2007
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| Download PDF Full-text (939 KB) Abstract: The unusual self-assembly in chloroform of a novel cyclodextrin-based [2]pseudorotaxane, composed of heptakis-2,6-di-O-methyl-3-O-acetyl-β-cyclodextrin and a viologen-containing linear component, is reported.
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