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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of top layer density and thickness on hardness of two-layer floor elements
    Autorzy:
    Grześkiewicz, Marek
    Kozakiewicz, Paweł
    Borysiuk, Piotr
    Romanovski, Valerjan
    Cichy, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/962355.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    floor elements
    ash wood
    pine wood
    top layer thickness
    wood hardness
    two-layer floor
    Opis:
    The subject of this paper is testing the hardness of two-layer floor materials with top layer made of ash wood in tangential cut, and bottom layer made of pine wood, radial cut, with cross wood fibre layout in both layers. Tests were carried out for top layer thickness 6.6 mm, 4.0 mm and 2.0 mm. Strong correlations were noticed between the hardness of floor elements and the density of the top layer for each thickness variant. Overall statistically significant influence of bottom layer density on the hardness of two-layer floor elements was observed in samples whose top layer was 2.0 mm thick.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2020, 62, 205; 69-80
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Selected Physico-Chemical Pretreatment Methods on Chemical Composition and Enzymatic Hydrolysis Yield of Poplar Wood and Corn Stover
    Autorzy:
    Antczak, Andrzej
    Szadkowski, Jan
    Radomski, Andrzej
    Zawadzki, Janusz
    Dąbkowska-Susfał, Katarzyna
    Walkowiak, Małgorzata
    Witczak, Magdalena
    Cichy, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/27323522.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    bioethanol
    corn stover
    enzymatic hydrolysis
    chemical composition
    acid pretreament
    alkaline pretreament
    LHW
    poplar wood
    Opis:
    In the paper, three different physico-chemical pretreatment methods in relation to bioethanol production were compared. The wood of fast-growing poplar species (Populus deltoides x maximowiczii and Populus trichocarpa Torr. & A. Gray ex Hook) and corn stover were used as a feedstock. The chemical composition and enzymatic hydrolysis efficiency of the biomass before and after pretreatments were compared. On the basis of the results, it was concluded that the applied pretreatments changed the chemical composition of the raw materials. In the case of the acid and LHW (liquid hot water pretreatment) methods, up to 93.7% of hemicelluloses (especially pentosans) were removed. From among the selected pretreatment methods, the LHW and alkaline methods occurred to be the most interesting. Nevertheless, from the bioethanol production point of view, the LHW process of Populus deltoides x maximowiczii wood was the best because after enzymatic hydrolysis, high amounts of glucose (up to 600.9 mg/g pretreated biomass) and minor amounts of xylose (up to 37.9 mg/g pretreated biomass) were produced. Moreover, based on the chemical composition and sugar profile analysis, it was proved that the Populus trichocarpa wood also has a high potential for bioethanol production.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 211; Art. no. 1644-3985.423.01
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cystic fibrosis is a risk factor for celiac disease
    Autorzy:
    Walkowiak, Jarosław
    Blask-Osipa, Anna
    Lisowska, Aleksandra
    Oralewska, Beata
    Pogorzelski, Andrzej
    Cichy, Wojciech
    Sapiejka, Ewa
    Kowalska, Mirosława
    Korzon, Michał
    Szaflarska-Popławska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1040437.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cystic fibrosis
    celiac disease
    antiendomysial antibodies
    genetic predisposition
    Opis:
    Background: The coexistence of cystic fibrosis (CF) and celiac disease (CD) has been reported. To our knowledge there is no study directly comparing the incidence of CD in CF patients to that in the general population at the same time. There is no published data on genetic predisposition to CD in CF patients either. Therefore, in the present study we aimed to assess the genetic predisposition to CD and its incidence in CF patients comparing it to data from the general population. Patients and methods: Two hundred eighty-two CF patients were enrolled in the study. In 230 CF patients the genetic predisposition to CD (the presence of HLA-DQ2/ DQ8) was assessed. In all CF patients, serological screening for CD was conducted. In patients with positive antiendomysial antibodies (EMA) gastroduenoscopy was offered. Intestinal histology was classified according to modified Marsh criteria. The results of serological CD screening in 3235 Polish schoolchildren and HLA-DQ typing in 200 healthy subjects (HS) were used for comparison. Results: Positive EMA was found in 2.84% of the studied CF patients. The incidence of proven CD was 2.13%. The incidence of CD as well as positive serological screening were significantly more frequent in the CF group than in the general population. The frequency of CD-related HLA-DQ alleles in CF and HS did not differ. Conclusions: Genetic predisposition to celiac disease in cystic fibrosis patients is similar to that of the general population. However, our results suggest that cystic fibrosis is a risk factor for celiac disease development.
    Źródło:
    Acta Biochimica Polonica; 2010, 57, 1; 115-118
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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