Poznań, Poland
Poznań, Poland

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Gryszczynska B.,Poznan University of Medical Sciences | Iskra M.,Poznan University of Medical Sciences | Malecka M.,Poznań University of Economics | Wielkoszynski T.,University of Silesia | And 6 more authors.
Journal of Elementology | Year: 2015

Ceruloplasmin (Cp) is the major antioxidant in plasma, a protein that carries about 95% of the total copper. Multiple biochemical activities of ceruloplasmin have been described, including copper transport or oxidation of Fe(II) to Fe(III) for subsequent uptake by transferrin and ferritin. Reduction of the pool of free Fe(II) ions by Cp prevents the generation of free radicals and reactive oxygen species by oxidation of Fe(II), thus inhibiting the Haber-Weiss reaction. The removal of both free Fe(II) and Fe(III) ions from blood plasma by polyphenols enhances the antioxidant system of the living organism. However, the mechanism of interactions between exo- and endogenous antioxidants is still under consideration. The effect of raspberry seed extract (RSE) on the ferroxidase activity of ceruloplasmin isolated from plasma of patients with chronic arterial occlusion of the lower limbs due to ath erosclerosis (CpAO) was investigated. Moreover, the effect of RSE on the ferroxidase activity of Cp isolated from healthy volunteers (CpC) was also estimated. The ferroxidase activity of Cp, expressed as ΔFe(II), was determined by spectrophotometry with the use of the Fe(II) – histidine complex and ferrozine as a chromogenic reagent. The addition of RSE to samples with the same amount of both CpAO or CpC in each caused an increase in ΔFe(II). The polyphenol-rich RSE may assist Cp in the fight against free radicals and reactive oxygen species when the disease occurs due to an excessive use or reduced production of endogenous antioxidants. © 2015, Polish Society Magnesium Research. All rights reserved.


Zaikov G.E.,RAS Emanuel Institute of Biochemical Physics | Rakhimkulov A.D.,RAS Emanuel Institute of Biochemical Physics | Lomakin S.M.,RAS Emanuel Institute of Biochemical Physics | Dubnikova I.L.,RAS Semenov Institute of Chemical Physics | And 3 more authors.
Molecular Crystals and Liquid Crystals | Year: 2010

Studies of thermal and fire-resistant properties of the polypropylene/multi-walled carbon nanotube composites (PP/MWCNT) prepared by means of melt intercalation are discussed. The sets of the data acquired with the aid of non-isothermal TG experiments have been treated by the model kinetic analysis. The thermal-oxidative degradation behavior of PP/MWCNT and stabilizing effect caused by addition of MWCNT has been investigated by means of TGA and EPR spectroscopy. The results of cone calorimetric tests lead to the conclusion that char formation plays a key role in the mechanism of flame retardation for nanocomposites. This could be explained by the specific antioxidant properties and high thermal conductivity of MWCNT which determine high-performance carbonization during thermal degradation process. Comparative analysis of the flammability characteristics for PP-clay/MWCNT nanocomposites was provided in order to emphasize the specific behavior of the nanocomposites under high-temperature tests. © Taylor & Francis Group, LLC.


Zaikov G.E.,RAS Emanuel Institute of Biochemical Physics | Lomakin S.M.,RAS Emanuel Institute of Biochemical Physics | Kuvardina E.V.,RAS Semenov Institute of Chemical Physics | Novokshonova L.A.,RAS Semenov Institute of Chemical Physics | And 2 more authors.
Oxidation Communications | Year: 2012

Studies of thermal and fire-resistant properties of the polypropylene/multi-walled carbon nanotube composites (PP/MWCNT) prepared by means of melt intercalation are discussed. The sets of the data acquired with the aid of non-isothermal TG experiments have been treated by the model kinetic analysis. The thermal-oxidative degradation behaviour of PP/MWCNT and stabilising effect caused by addition of MWCNT has been investigated by means of TGA and EPR spectroscopy. The results of cone calorimetric tests lead to the conclusion that char formation plays a key role in the mechanism of flame retardation for nanocomposites. This could be explained by the specific antioxidant properties and high thermal conductivity of MWCNT which determine high-performance carbonisation during thermal degradation process. Comparative analysis of the flammability characteristics for PP-clay/MWCNT nanocomposites was provided in order to emphasise the specific behaviour of the nanocomposites under high-temperature tests.


Rakhimkulov A.D.,RAS Emanuel Institute of Biochemical Physics | Lomakin S.M.,RAS Emanuel Institute of Biochemical Physics | Dubnikova I.L.,RAS Semenov Institute of Chemical Physics | Shchegolikhin A.N.,RAS Emanuel Institute of Biochemical Physics | And 2 more authors.
Journal of Materials Science | Year: 2010

Studies of thermo-oxidative and fire-resistant properties of the polypropylene/multi-walled carbon nanotube composites (PP/MWCNT) prepared by melt intercalation are discussed. The effective kinetic parameters of the PP/MWCNT thermo-oxidative decomposition were computed according to the model-based kinetic analysis. The thermo-oxidative decomposition behavior of PP/MWCNT and stabilizing effect caused by addition of MWCNT has been investigated by means of TGA and EPR spectroscopy. Comparative analysis of the flammability characteristics for PP-clay/MWCNT nanocomposites was provided in order to emphasize the specific behavior of the nanocomposites. © 2009 Springer Science+Business Media, LLC.


Kowalska J.,Institute of Plant Protection | Remlein-Starosta D.,Institute of Plant Protection | Seidler-Lozykowska K.,Institute of Natural Fibres | Bocianowski J.,University of Life Sciences in Poznań
Acta Scientiarum Polonorum, Hortorum Cultus | Year: 2014

The need to obtaining of healthy plant material and very small range of plant protection products in organic farming forces to searching for alternative means of plant production. Evaluation of Trichoderma asperellum as a growth promoter and the control effects of T. asperellum to Septoria melissae was evaluated. Also the fungi infesting lemon balm were identified. The experiment covered various combinations depending on the farming systems (conventional and organic system) and application of T. asperellum. The microorganism was used three times with one month interval as foliar spraying only in organically growing plants. T. asperellum was applied as water solution at a concentration of 10 g·l-1 by shoulder-carried sprayer. Control plots were treated only with water, no chemical fungicides were used. Plant development and its healthiness were assessed in respect of the effect of Trichoderma. T. asperellum was capable of stimulating the plant growth and in consequence causing an increase of dried mass of herb. There was no influence on essential oil content and proportion of leaves in the dried herb. The possibility of using of Trichoderma could be promising; especially for organic farming. Among pathogens naturally infesting of lemon balm Septoria melissae was identified most commonly.


Zimniewska M.,Institute of Natural Fibres | Krucinska I.,Technical University of Lodz
Journal of the Textile Institute | Year: 2010

Present studies were undertaken to determine the influence of clothing made from natural and synthetic fibres and their blends, which transiently covered a human body, on the activity of motor units of forearm muscles determined by electromyographic method. The clothes made out of 100% linen, 100% polyester (PES) and their blends with a different percentage of both kinds of raw material were examined. The studies proved that there were considerable changes in the parameters of skin-clothes microclimate that depend on the share of polyester fibres in the blends with linen. These changes can be the reason of differences in electromyographic records of motor unit activity of the muscles covered by tested clothes, even if the volunteers taking part in this experiment had not been doing any physical exercises. The results of tests showed that clothing made from polyester fabric was a reason of changes in muscle electromyograph (EMG) records of the wearers, which indicated occurrence of desynchronization of motor units. The clothes made of fabrics composed of polyester and linen fibres higher than 25% did not cause desynchronization of motor units in healthy muscles while providing the wearer with optimal comfort of using. © 2010 The Textile Institute.

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