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    Wyświetlanie 1-4 z 4
    Tytuł:
    Basic energetic parameters of Acanthamoeba castellanii mitochondria and their resistance to oxidative stress
    Autorzy:
    Jarmuszkiewicz, Wieslawa
    Antos-Krzeminska, Nina
    Drachal-Chrul, Danuta
    Matkovic, Karolina
    Nobik, Wioletta
    Pieńkowska, Joanna
    Swida, Aleksandra
    Woyda-Ploszczyca, Andrzej
    Budzinska, Malgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/1040753.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Acanthamoeba castellanii
    mitochondria
    hydrogen peroxide
    oxidative stress
    Opis:
    The purpose of this study was establishing the basic energetic parameters of amoeba Acanthamoeba castellanii mitochondria respiring with malate and their response to oxidative stress caused by hydrogen peroxide in the presence of Fe2+ ions. It appeared that, contrary to a previous report (Trocha LK, Stobienia O (2007) Acta Biochim Polon 54: 797), H2O2-treated mitochondria of A. castellanii did not display any substantial impairment. No marked changes in cytochrome pathway activity were found, as in the presence of an inhibitor of alternative oxidase no effects were observed on the rates of uncoupled and phosphorylating respiration and on coupling parameters. Only in the absence of the alternative oxidase inhibitor, non-phosphorylating respiration progressively decreased with increasing concentration of H2O2, while the coupling parameters (respiratory control ratio and ADP/O ratio) slightly improved, which may indicate some inactivation of the alternative oxidase. Moreover, our results show no change in membrane potential, Ca2+ uptake and accumulation ability, mitochondrial outer membrane integrity and cytochrome c release for 0.5-25 mM H2O2-treated versus control (H2O2-untreated) mitochondria. These results indicate that short (5 min) incubation of A. castellanii mitochondria with H2O2 in the presence of Fe2+ does not damage their basic energetics.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 2; 349-356
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developmental changes in barley microRNA expression profiles coupled with miRNA target analysis
    Autorzy:
    Pacak, Andrzej
    Kruszka, Katarzyna
    Swida-Barteczka, Aleksandra
    Nuc, Przemyslaw
    Karlowski, Wojciech
    Jarmolowski, Artur
    Szweykowska-Kulinska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1038742.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    barley
    microRNA
    deep sequencing
    development
    Opis:
    MicroRNAs are 19- to 24-nt-long single-stranded RNAs that are crucial regulators of gene expression which control plant development and response to environmental cues. We have analyzed microtranscriptomes of five barley developmental stages. Generally, during the barley development, miR168-3p and miR1432-5p levels increase while the 5'U-miR156-5p level decreases (with exception for the 2-week-old barley). We have identified two miR156-5p izomiRs (called 5'U-miR156-5p [20 nt] and 5'UU-miR156-5p [21 nt]), which were expressed differently during barley development. The 5' U-miR156-5p level decreased in 3-week-, 6-week-, and 68-day-old barley, when compared to the 1-week-old plants. Meanwhile, the 5' UU-miR156-5p level increased significantly in the 68-day-old barley plants. Moreover, only the 5' U-miR156 isomiR recognizes and guides unique transcription factor mRNAs from the Squamosa Promoter Binding Protein-Like (SPL) family. We identified many non-canonical microRNAs with changed expression levels during the barley development. Here, we present the profiles of microRNA expression characteristics for particular barley developmental stages. These analyses are accompanied by the experimental degradome analysis of miRNA targets.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 4; 799-809
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barley primary microRNA expression pattern is affected by soil water availability
    Autorzy:
    Swida-Barteczka, Aleksandra
    Kruszka, Katarzyna
    Grabowska, Aleksandra
    Pacak, Andrzej
    Jarmolowski, Artur
    Kurowska, Marzena
    Szarejko, Iwona
    Szweykowska-Kulinska, Zofia
    Powiązania:
    https://bibliotekanauki.pl/articles/1038746.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    pri-miRNA
    miRNA
    drought
    rehydration
    barley genotypes
    Opis:
    MicroRNAs are short molecules of 21-24 nt in length. They are present in all eukaryotic organisms and regulate gene expression by guiding posttranscriptional silencing of mRNAs. In plants, they are key players in signal transduction, growth and development, and in response to abiotic and biotic stresses. Barley (Hordeum vulgare) is an economically important monocotyledonous crop plant. Drought is the world's main cause of loss in cereal production. We have constructed a high-throughput Real-Time RT-qPCR platform for parallel determination of 159 barley primary microRNAs' levels. The platform was tested for two drought-and-rehydration-treated barley genotypes (Rolap and Sebastian). We have determined changes in the expression of primary microRNAs responding to mild drought, severe drought, and rehydration. Based on the results obtained, we conclude that alteration in the primary microRNA expression is relative to the stress's intensity. Mild drought and rehydration mostly decrease the pri-miRNA levels in both of the tested genotypes. Severe drought mainly induces the primary microRNA expression. The main difference between the genotypes tested was a much-stronger induction of pri-miRNAs in Rolap encountering severe drought. The primary microRNAs respond dynamically to mild drought, severe drought, and rehydration treatments. We propose that some of the individual pri-miRNAs could be used as drought stress or rehydration markers. The usage of the platform in biotechnology is also postulated.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 4; 817-824
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors influencing the use of trade credit in financing Polish listed companies
    Autorzy:
    Duliniec, Aleksandra
    Świda, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/1837735.pdf
    Data publikacji:
    2021-03-30
    Wydawca:
    Uniwersytet Ekonomiczny w Poznaniu
    Tematy:
    trade payables
    trade credit
    sources of financing
    Warsaw Stock Exchange
    Opis:
    The aim of this article is to identify the most important factors influencing the use of trade credit and to assess their significance for Polish listed companies taking into consideration the role of trade credit as a source of financing. Theoretical and empirical literature does not provide clear guidance regarding factors influencing the use of trade credit. In this study the linear regression model with fixed effects for years is used to describe trade credit use in listed Polish companies in the period 2002-2018. The findings show that the following factors have the most pronounced influence on the use of trade credit: trade payables in the previous period, trade receivables, long-term debt, liquidity and short-term debt. Both long-term and short-term debt financing and trade payables are substitutes for Polish listed companies. Lower liquidity and higher trade receivables are related to a higher use of trade credit.
    Źródło:
    Economics and Business Review; 2021, 7, 1; 113-134
    2392-1641
    Pojawia się w:
    Economics and Business Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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