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    Wyświetlanie 1-3 z 3
    Tytuł:
    Physical methods of microalgal biomass pretreatment
    Autorzy:
    Piasecka, A.
    Krzeminska, I.
    Tys, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/25591.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    biomass
    sonication
    microwave
    physical method
    microalga
    pretreatment
    lipid content
    Opis:
    The prospect of depletion of natural energy resources on the Earth forces researchers to seek and explore new and alternative energy sources. Biomass is a composite resource that can be used in many ways leading to diversity of products. Therefore, microalgal biomass offers great potential. The main aim of this study is to find the best physical method of microalgal bio- mass pretreatment that guarantees efficient lipid extraction. These studies identifies biochemical composition of microalgal biomass as source for biodisel production. The influence of drying at dif- ferent temperatures and lyophilization was investigated. In addi- tion, wet and untreated biomass was examined. Cell disruption (sonication and microwave) techniques were used to improve lipid extraction from wet biomass. Additionally, two different extrac- tion methods were carried out to select the best method of crude oil extraction. The results of this study show that wet biomass after sonication is the most suitable for extraction. The fatty acid com- position of microalgal biomass includes linoleic acid (C18:2), palmitic acid (C16:0), oleic acid (C18:1), linolenic acid (C18:3), and stearic acid (C18:0), which play a key role in biodiesel production.
    Źródło:
    International Agrophysics; 2014, 28, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of epidemiological obesity among adults in EU countries
    Autorzy:
    Krzysztoszek, J.
    Laudanska-Krzemińska, I.
    Bronikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083069.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    obesity
    adults
    Europe
    evaluation studies
    epidemiology
    Opis:
    Introduction. Obesity is a serious health problem in nearly all regions of Europe. During the last four decades, the percentage of obese people increased four times among men and twice among women, reaching a global epidemic scale as the biggest health-related issue in the developed and developing countries. Objective. The aim was to assess the epidemiological situation of obesity, according to gender among adults in Europe, compared with other regions and selected worldwide countries, as well as to devise a forecast for the near future based on analysis results. Materials and method. An overview was performed of the World Health Organization (WHO) statistical database in 1999–2016, concerning obesity prevalence among people over the age of 20 across 28 countries of the European Union. A forecast for the years 2020 and 2030 was prepared by evaluation of gradients for trendline equations. Moreover, some of the world regions, as well as individual countries, five per region, were collated and analyzed to prepare the forecast. Results. The percentage of obese people in the countries of the European Union continues to increase every year. The dynamics of obesity growth in Europe is greater for men than for women (3.09% per year vs. 1.92% per year). With the growth rate remaining at the estimated level, in 2030 there will probably be more obese men (38.1%) than women (32.7%) in Poland, and in Europe likewise – 36.6% and 32.0%, respectively. Conclusions. Obesity has become a major epidemiological problem and an undisputable health problem not only in Poland and other European countries, but worldwide.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 341-349
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late Svecofennian sedimentary basins in the crystalline basement of NE Poland and adjacent area of Lithuania: ages, major sources of detritus, and correlations
    Autorzy:
    Krzeminska, E.
    Wiszniewska, J.
    Skridlaite, G.
    Williams, I. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059225.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Fennoscandia
    Sarmatia
    Greenland
    Svecofennian basin
    detrital zircon
    geochronology
    Opis:
    The Pre cam brian base ment of Lith u a nia and NE Po land, much of which is metasedimentary paragneiss, can be ac cessed only by cores from deep bore holes. Ion microprobe dat ing of de tri tal zir cons from sam ples of these meta sedi ments and the geo chem i cal sig na tures of the rocks pro vide new in sights into their age and prov e nance. De tri tal zir cons from meta sedi ments from Jastrzebna and Monki have Pb iso to pic ages in the ranges 3.14–1.83 and 3.53–1.82 Ga, re spec tively. Sim i lar re sults have been ob tained from the Lith u a nian Lazdijai and Bliudziai paragneisses. About 30% of the ana lysed Pol ish de tri tal zir con cores are of Late Archaean age (2.90–2.60 Ga) and about 70% are Palaeoproterozoic (2.10–1.90 Ga), sim i lar to the age dis tri bu tions of de tri tal zir con from Svecofennian meta sedi ments ex posed in Cen tral Swe den and South ern Fin land. The youn gest de tri tal zir con sub-groups in di cate max i mum de po si tion ages of about 1.86 Ga, sim i lar to the ages of ex posed Svecofennian sed i men tary bas ins. Pos si ble source rocks of com pa ra ble ages and af fin i ties can be found within Fennoscandia, Green land and Sarmatia.
    Źródło:
    Geological Quarterly; 2009, 53, 3; 255-272
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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