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Wyszukujesz frazę "Makarova, K." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Optimization of Antioxidant Properties of Creams with Berry Extracts by Artificial Neural Networks
    Autorzy:
    Makarova, K.
    Zawada, K.
    Wagner, D.
    Skowyra, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030222.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Mh
    33.35.+r
    61.72.Hh
    76.30.-v
    87.64.kh
    87.80.Lg
    Opis:
    Oxidative stress and the excess of free radicals accelerate the ageing process of human skin. The application of skin cream with antioxidant compounds could reduce the damage caused by free radicals. In this work we studied two types of skin creams with extracts from aronia (Aronia melanocarpa), elderberry (Sambucus nigra) and bilberry (Vaccinium myrtillus) because of their high content of anthocyanins, i.e. strong natural antioxidants. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging ability of the skin creams with berry extracts were studied with ESR spectroscopy. The artificial neural networks were applied to optimize the berry extract concentration and storage time for oil-in-water and water-in-oil creams. Based on experimental results chokeberry and elderberry extracts in oil-in-water cream base revealed higher DPPH radical scavenging ability than in the corresponding water-in-oil. Artificial neural networks predicts maxima of DPPH radical scavenging for 1-week stored elderberry (2.23 mg DPPH/g) and 1-week stored chokeberry (5.84 mg DPPH/g) and bilberry (5.26 mg DPPH/g) 0.76% extracts in oil-in-water creams. The maxima of DPPH radical scavenging for water-in-oil creams were predicted for 6-week stored 0.8% aronia extract, freshly prepared 0.76% bilberry extract and 1-week stored 0.56% elderberry extract. The artificial neural networks predicted values are in good agreement with the experimental values. DPPH-EPR could be combined with artificial neural networks to optimize the extract concentration, and the type of cream base as well as to predict the effect of storage based on a limited number of experiments and samples.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 44-51
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Optimization of Antioxidant Properties of Herbal Bathing Salts
    Autorzy:
    Zawada, K.
    Makarova, K.
    Kowalska, D.
    Wawer, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032383.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.kh
    87.80.Lg
    Opis:
    The antioxidant properties 4 herbal infusions (of lavender flower, melissa leaf, verbena herb, and birch leaf), 2 salts (Dead Sea and Bochnia Mine salts) and 8 herbal salts (combination of herbal extract and salt) have been evaluated by 2,2-diphenyl-1-picrylhydrazyl-ESR (DPPH-ESR) test, ferric reducing antioxidant power and spin trap ESR using the Fenton reaction. The influence of herbal extracts and herbal salts on lipid membrane permeability has been studied with the spin probe ESR in the range of 293-323 K. The highest antioxidant activity was determined for melissa leaf preparations followed by birch leaf preparations in DPPH and ferric reducing antioxidant power assays whereas in the Fenton reaction the highest radical scavenging was observed for verbena herb and melissa leaf preparations. The lowest membrane permeability was observed in the presence of infusions of melissa and birch leaves, followed by corresponding herbal salts based on Bochnia Mine salt, and it was lower than in the reference system. On the other hand, lavender infusion increased the permeability of the model membrane, whereas the lavender salts decreased it. Therefore, the antioxidant activity of herbal infusions and salts towards skin could be inhibited by a lowered permeability. Thus, the combination of permeability studies with antioxidant studies in the presence of model lipids could be potentially used for optimization of other types of herbal bath salts.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 56-61
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin trapping studies of essential oils in lipid systems
    Autorzy:
    Makarova, K.
    Drązikowska, K.
    Suska, B.
    Zawada, K.
    Wawer, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/147786.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    spin trapping ESR
    essential oils
    DFT calculations
    lipids
    Opis:
    In the present work, we report the results of a spin trapping ESR study of four essential oils widely used for skin care products such as creams and bath salts. The studied essential oils are Rosmarini aetheroleum (rosemary), Menthae piperitae aetheroleum (mint), Lavandulae aetheroleum (lavender), and Thymi aetheroleum (thyme). Fenton reaction in the presence of ethanol was used to generate free radicals. The N-tert- -butyl-α-phenylnitrone (PBN) was used as a spin trap. In the Fenton reaction, the rosemary oil had the lowest effect on radical adduct formation as compared to the reference Fenton system. Since essential oils are known to be lipid soluble, we also conducted studies of essential oils in Fenton reaction in the presence of lipids. Two model lipids were used, namely 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1,2-dipalmitoyl-sn- -glycero-3-phosphocholine (DPPC). The obtained results suggested that in the presence of DOPC lipids, the •OH and PBN/•CHCH3(OH) radicals are formed in both phases, that is, water and lipids, and all the studied essential oils affected the Fenton reaction in a similar way. Whereas, in the DPPC system, the additional type of PBN/X (aN = 16.1 G, aH = 2.9 G) radical adduct was generated. DFT calculations of hyperfi ne splittings were performed at B3LYP/6-311+G(d,p)/EPR-II level of theory for the set of c-centered PBN adducts in order to identify PBN/X radical.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 461-468
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antioxidant Properties and Stability of Geissospermum Reticulatum Tinctures: Lag Phase ESR and Chemometric Analysis
    Autorzy:
    Sajkowska-Kozielewicz, J.J.
    Gulik, K.
    Makarova, K.
    Paradowska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032448.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Mh
    87.64.kh
    87.80.Lg
    Opis:
    Geissospermum species are widely used in folk medicine in the Amazon region. This study was conducted to determine total phenolic and flavonoid contents of three tinctures of Geissospermum reticulatum barks from Peruvian Amazon and correlate these contents to the antioxidant activities and stability. Total content of phenolic compounds (from 694.91 to 1430.67 mg GAE/kg) and flavonoids (575.23-815.65 mg CAE/kg) were found by spectrophotometric methods. The obtained values were interpreted by artificial neural networks to describe the most beneficial conditions for tinctures. All tinctures have demonstrated the maximum of total flavonoid between 14 and 20 weeks of maceration, whereas the maximum of total flavonoid was between 25 and 30. The highest antioxidant properties were exhibited by tinctures in 3 different tests (ferric reducing ability of plasma, DPPH-ESR, oxygen radical absorbance capacity) after 35 weeks of maceration. The principal component analysis was employed to relate contents and properties. Results from the lag phase with α -(4-pyridyl-1-oxide)-N-tert-butylnitrone (POBN) spin trap studies at 60°C demonstrated that the stability of tinctures were related to total phenolic content. Thus, samples with 550-800 mg GAE/kg were more stable than those with higher total phenolic contents. The most beneficial conditions for bark tinctures depend on aimed final products, e.g. maximum of polyphenols or flavonoids and long-term stability. Further studies about content and storage conditions are needed.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 68-73
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the actions aimed at the transition to sustainable public transport system
    Autorzy:
    Shubenkova, K.
    Makarova, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/263544.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    sustainable transport
    public transport system
    efficiency
    radar map
    zrównoważony transport
    komunikacja miejska
    wydajność
    Opis:
    The twentieth century, which became a period of unprecedented growth of cities and urbanization, revealed the need of mankind to develop and implement the principles of sustainable development. Possible ways to shift to sustainable transport system (such as the use of alternative fuel and transition to public and non-motorized modes of transport) are discussed in this article. The objective of this publication is to assess efficiency of such methods’ implementation on the example of the concrete city. Authors have suggested to change the bus route network, the structure of the bus fleet on the routes and to replace public transport buses by the new ones run on methane. To check these suggestions, authors have built the new one transport model and have simulated three cases: the existing route network and bus fleet’s structure, the proposed new one route network with buses run on diesel fuel and the proposed new one route network with buses run on methane. To evaluate efficiency, authors have assessed economic efficiency, positive social effect, environmental friendliness and sustainability of the urban transport system. Economic efficiency is achieved by reducing overruns and fuel costs thanks to the use of buses run on methane. The social effect is in the reduction of: 1) the delivery time by the route network optimization, 2) the likelihood of traffic jams, and 3) the downtime of buses at the bus stops. Since congestions increase pollutant emissions, route network optimization reduces negative impact on the environment. Replacing public transport buses by the new ones run on methane gives the same positive effect. To assess sustainability of the urban transport city is the most difficult task. The authors have identified indicators and used the radar map to compare possible solutions.
    Źródło:
    Archiwum Motoryzacji; 2018, 81, 3; 75-90
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compressed natural gas as motor fuel: possibilities, problems and solutions
    Autorzy:
    Makarova, I.
    Shubenkova, K.
    Sadygova, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/263134.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    gas-cylinder vehicles
    natural gas fuel
    service center
    simulation model
    gaz ziemny
    paliwo
    butla gazowa
    pojazd
    model
    symulacja
    Opis:
    The article is devoted to the increase of the cargo vehicles market on the gas-engine fuel. The article considers the relevance of the use of the alternative types of transport’s fuels. As potential energy carriers for internal combustion engines, gas engine fuels are considered. Prospects and problems of using natural gas as motor fuel, as well as ecological and economic aspects of the use of compressed natural gas as fuel for vehicles are presented. Prospects for expanding the market for trucks powered by gas engine fuel are discussed, as well as the advantages of using natural gas as a safe, environmentally friendly and economical type of alternative fuel are considered. It is shown that the main obstacle to the expansion of the gas engine vehicles’ market is the underdevelopment of the infrastructure: filling stations and service centres. The organization of gas-cylinder vehicles (GCV) servicing is considered. The authors have developed an imitation model that allows determining the optimal number of repair stations for the service centre, as well as software for forecasting the required number of automobile gas filling compressor stations (AGFCS).
    Źródło:
    Archiwum Motoryzacji; 2018, 82, 4; 43-62
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the city transport system’s development strategy design principles with account of risks and specific features of spatial development
    Autorzy:
    Makarova, I.
    Shubenkova, K.
    Gabsalikhova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/374563.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    sustainable city
    transportation system
    risk analysis
    public transport
    non-motorized transport
    miasto zrównoważone
    system transportowy
    analiza ryzyka
    transport publiczny
    transport niezmotoryzowany
    Opis:
    Transport system is the key indicator of sustainable spatial development, because if it is ineffective it can render the economy, the environment, and society vul-nerable. Despite the large number of already existing research, the city transportation sys-tem’s development strategy design is still a relevant objective, because the existing ways and strategies of the transport development may not always be applicable in certain cir-cumstances. This article presents the possible ways of improvement of sustainability of the city transportation systems adapted in accordance with the peculiarities of Russian cit-ies. It is stated that when working out a city transportation system’s development strategy it is necessary to take into account all possible risks. According to the case study of Na-berezhnye Chelny city, all vulnerabilities of the system that today are typical almost for all Russian cities were analyzed, classification of risks was made, and means of their con-trol were suggested. Solutions proposed as a result of the SWOT-analysis can be used when developing transport strategies for other cities with similar specificity.
    Źródło:
    Transport Problems; 2017, 12, 1; 125-138
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving safety on the crosswalks with the use of fuzzy logic
    Autorzy:
    Makarova, I.
    Shubenkova, K.
    Mavrin, V.
    Buyvol, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/961409.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    road safety
    fuzzy logic
    pedestrian
    crossroad
    traffic light
    bezpieczeństwo drogowe
    logika rozmyta
    piesi
    skrzyżowanie
    światła drogowe
    Opis:
    The article provides an analysis of the global trends in the field of city transport systems’ safety. Currently, the efforts to increase the proportion of trips made by foot or by non-motorized transport are being made. That is why the problem of ensuring safety of the most vulnerable road users is relevant. The statistics of traffic accidents with victims, as well as the factors that cause such accidents, is analysed. Simulation has shown that rational management can reduce the likelihood of road traffic accidents.
    Źródło:
    Transport Problems; 2018, 13, 1; 97-109
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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