Autor: Simon, Paul - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Trzeba dać sygnał
Autorzy:: Simon, Paul.
Powiązania:: Polska Zbrojna 1994, nr 216, s. 1-2
Współwytwórcy:: Berezowski, Maksymilian. Opracowanie
Data publikacji:: 1994
Tematy:: NATO rozszerzenie polityka 1994 r.
Opis:: Fot.
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 2.

Tytuł:: On the Nature of Tintinnid Loricae (Ciliophora: Spirotricha: Tintinnina): a Histochemical, Enzymatic, EDX, and High-resolution TEM Study
Autorzy:: Agatha, Sabine
Simon, Paul
Powiązania:: https://bibliotekanauki.pl/articles/763619.pdf
Data publikacji:: 2012
Wydawca:: Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:: Chemical composition, crystal lattice, EDX analysis, enzyme digestion, high-resolution transmission electron microscopy, histochemical methods, lorica, tintinnid
Opis:: Tintinnids (Ciliophora: Spirotricha: Tintinnina) are occasionally the dominant ciliates in the marine plankton. The tintinnid loricae are minute artworks fascinating scientists for more than 230 years, but their chemical composition remained unclear, viz., chitinous or proteinaceous substances were discussed. Since sedimenting loricae contribute to the flux of elements and organic compounds in the oceans, knowledge about their nature is necessary in assessing their ecological role. Previous techniques and new methods, e.g. enzymatic digestion and high-resolution transmission electron microscopy, are applied in the present study. A chitinous nature of the loricae is rejected by the Van-Wisselingh test and failure of chitinase digestion. Only proteins might show a resistance against strong hot bases (KOH at 160°C for ~ 40 min. in tintinnid loricae) similar to that of chitin. Actually, the presence of nitrogen in the EDX analyses and the digestion of at least some loricae by proteinase K strongly indicate a proteinaceous nature. Furthermore, the crystal lattice revealed by high-resolution TEM in Eutintinnus loricae is similar to the proteinaceous surface layer (S-layer) of archaea, and the striation recognizable in transverse sections of Eutintinnus loricae has a periodicity resembling that of the crystalline proteins in the extruded trichocysts of Paramecium and Frontonia. The proteolytic resistance of some loricae does not reject the idea of a proteinaceous nature, as proteins in S-layers of some archaea and in most naturally occurring prions show comparable reactions. The data from the present study and the literature indicate proteins in the loricae of thirteen genera. Differences in the proteolytic resistance and staining properties between genera and congeners are probably due to deviations in the protein composition and the additional substances, e.g. lipids, carbohydrates. At the present state of knowledge, correlations between lorica structure, wall texture, ultrastructure of the lorica forming granules, and the histochemical and enzymatic findings are not evident. Therefore, further studies are required to estimate the taxonomic significance of these features and the ecological role of sedimenting loricae.
Źródło:: Acta Protozoologica; 2012, 51, 1
1689-0027
Pojawia się w:: Acta Protozoologica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Foreign direct investment and economic growth in developing countries: The role of international trade and foreign debt
Autorzy:: Epor, Simon Okaja
Yua, Henry
Terhemba Iorember, Paul
Powiązania:: https://bibliotekanauki.pl/articles/23942885.pdf
Data publikacji:: 2024-01-03
Wydawca:: Fundacja Naukowa Instytut Współczesnych Finansów
Tematy:: foreign direct investment
trade openness
external debt
economic growth
developing countries
external finance
ARDL
autoregressive distributed lag model
Opis:: The existing literature is sparse on the role of international finance in modeling the FDI-growth nexus. This study integrates the role of international trade and external debt in the FDI-economic growth nexus for Brazil, Nigeria, and Vietnam. We apply the Autoregressive Distributed Lag (ARDL) model to annual data covering the period 1990-2021. The results show that FDI and trade have positive but insignificant effects on economic growth in all three countries. In addition, our results show that external debt hampers long-term economic growth in these countries. Based on the results, we propose country-specific recommendations that take into account specific economic and financial conditions, global market dynamics, and the long-term development goals of developing countries.
Źródło:: Modern Finance; 2024, 2, 1; 1-17
2956-7742
Pojawia się w:: Modern Finance
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Some results on total domination in direct products of graphs
Autorzy:: Dorbec, Paul
Gravier, Sylvain
Klavžar, Sandi
Spacapan, Simon
Powiązania:: https://bibliotekanauki.pl/articles/743885.pdf
Data publikacji:: 2006
Wydawca:: Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:: direct product
total domination
k-tuple domination
open packing
domination
Opis:: Upper and lower bounds on the total domination number of the direct product of graphs are given. The bounds involve the {2}-total domination number, the total 2-tuple domination number, and the open packing number of the factors. Using these relationships one exact total domination number is obtained. An infinite family of graphs is constructed showing that the bounds are best possible. The domination number of direct products of graphs is also bounded from below.
Źródło:: Discussiones Mathematicae Graph Theory; 2006, 26, 1; 103-112
2083-5892
Pojawia się w:: Discussiones Mathematicae Graph Theory
Dostawca treści:: Biblioteka Nauki