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Wyszukujesz frazę "syntheses" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Synthesis, Spectroscopic Interpretations, and Antioxidant Efficiency of Two Vital Selenium Complexes
Autorzy:
Al-Khodir, F.
Powiązania:
https://bibliotekanauki.pl/articles/1030094.pdf
Data publikacji:
2017-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
nicotinamide
riboflavin
selenium
syntheses
characterization
antioxidant
Opis:
This paper aimed to synthesis, spectroscopic characterizations, and antioxidant assessment of two new selenium complexes with nicotinamide (Nic) and riboflavin (RF) as drug chelates. The speculated structures of the synthetic selenium complexes have been discussed by using different tools of spectroscopic analyses like infrared, the Raman, electronic, ¹H-NMR, and mass. Accordingly, the Fourier transform infrared and ¹H-NMR spectra, the mode of complexation is supported, as four molecules of nicotinamide drug act as a monodentate chelate through the N-atom of the pyridine ring with [Se(Nic)₄]·H₂O formula. The two riboflavin drug molecules coordinated to selenium metal as a bidentate chelate through azomethine nitrogen of pyrazine ring and O-atom of C=O pyrimidine-2,4-dione group with general formula [Se(RF)₂]. Both of Nic and RF chelates act as neutral charge ligands. The conductivity measurements indicated that the selenium complexes are non-electrolytes behaviors. Thermal analyses (thermal gravimetric-differential thermal analysis) of the studied complexes show that the decomposition process takes place in one broadening step with a wide temperature range. The surface morphology of the mentioned complexes was studied by scanning electron microscope and the particle size is calculated using X-ray powder diffraction. Thermodynamic kinetic parameters are calculated by using the Coats and Redfern equation. Screening of antioxidant activities of selenium complexes in vitro are assessed. The antioxidant activity is studied by three methods (DPPH assay, β-carotene/linoleic acid bleaching assay, and ferric reducing power assay), the studied complexes have a significant antioxidant activity compared to synthetic antioxidants like trolox and BHT.
Źródło:
Acta Physica Polonica A; 2017, 132, 4; 1265-1271
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obecność tradycyjnych religii afrykańskich w dynamice innowacji religijnych Czarnej Afryki
The presence of tradicional African regions in the dynamic of Balck Africas religious innovations
Autorzy:
Michałek, Adam
Powiązania:
https://bibliotekanauki.pl/articles/567108.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie. Instytut Nauk Politycznych
Tematy:
Tradicional African Religions
Black Africa
Religious syntheses
Opis:
The aim of the article is to prove the permanent presence of the Traditional African Religions (TARs) in the complex and versatile dynamic of religious innovations in today’s Black Africa. Cultures and religious of the Africa's territories located in the south of Sahara are often perceived from the point of view of the first travellers' idealised generalisations. Yet, TARs do function nowadays in a space traced by an enduring influence of Christianity, Islam and multi- aspect modernism - effectively fragmenting traditional holistic systems. The research on the Black Africa's religious phenomenon confirms the TARs' commendable ability to adapt to new social and political structures of the post-colonial Africa. The TARs' permanent vitality is proved by statistics - yet they require a special interpretation. On the basis of David Barret's research (World Christian Encyclopedia, Oxford, 2001), 12.3% of the Black Africa's population declare their affiliation with the ancestors' religions. However, it should be indicated that the data do not represent the phenomenon, which I name with the term „double religious affiliation" or „double religious fidelity:" African Christians and Muslims simultaneously keep a strong relationship with the ancestors' religions. The double religious affiliation is an origin to new religious syntheses about Messianic aspirations, e.g. kimbangism, amicalism, mpadism and others. TARs is a factor that continuously integrates African traditions.
Źródło:
Forum Politologiczne; 2009, 9 - Ugrupowania polityczne i ruchy społeczne w Afryce; 239-251
1734-1698
Pojawia się w:
Forum Politologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Syntezy i aktywność biologiczna pochodnych pirydopirydazyny
Synthesis and biological activity of pyridopyridazine derivatives
Autorzy:
Nawrocka, W. P.
Nowicka, A.
Powiązania:
https://bibliotekanauki.pl/articles/171526.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
pochodne pirydopirydazyn
struktury
syntezy
aktywność biologiczna
pyridopyridazine derivatives
structures
syntheses
biological activity
Opis:
For many years all six isomers of pyridopyridazines have been an interesting class of heterocyclic compounds because of their biological and chemical properties. Endralazine is a hypotensive drug, which contain pyrido[4,3-c]pyridazine structure. Presented in this paper selected compounds exhibit antiviral [20] and antibacterial [21, 22] activity. Based on review of the chemical literature, derivatives of pyridopyridazine showed a multipharmacological effects such as analgesic [23–29] and diuretic [33–38] activity. Some chemical compounds, containing pyridopyridazine moiety showed anticancer activity in vitro with different mechanism of action [12, 15, 18, 19]. Novel pyrazolopyridopyridazine derivatives have been identified as more potent and selective phosphodiesterase 5 (PDE5) inhibitors than sildenafil [41]. Pyrido[2,3-d] pyridazine derivatives were synthesized as selective PDE4 inhibitors [44–46], with good selectivity profile and less undesiderable side effects. 2,3,8-Trisubstituted pyrido[ 2,3-d]pyridazines were novel classes of GABA-A receptor benzodiazepine binding site ligands [30, 31]. While pyrido[2,3-c]pyridazine derivatives were selective agonists for the benzodiazepine site of GABA-A receptor [32]. Some of new substituted pyrido[3,2-c]pyridazine derivatives possess molluscicidal activity [54] and can be used as biodegradable agrochemicals.
Źródło:
Wiadomości Chemiczne; 2014, 68, 1-2; 67-94
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kilka refleksji o ukraińskiej (i nie tylko) historiografii postsowieckiej
Some Reflections on (Not Only) Ukrainian Post-Soviet Historiography
Autorzy:
Portnov, Andrii
Powiązania:
https://bibliotekanauki.pl/articles/2105980.pdf
Data publikacji:
2021-05-19
Wydawca:
Polska Akademia Nauk. Instytut Historii im. Tadeusza Manteuffla PAN w Warszawie
Tematy:
historiografia ukraińska
syntezy historyczne
polityka tożsamości
kultura dyskusji
Ukrainian historiography
historical syntheses
identity politics
culture of discussion
Opis:
Celem artykułu jest podsumowanie głównych tendencji w rozwoju postsowieckiej historiografii ukraińskiej i umieszczenie ich w szerszym kontekście współczesnych wyzwań stojących przed naukami humanistycznymi, w tym rosnącego wpływu „polityki tożsamości”. Autor opowiada się za istotnością kontekstualnej analizy debat historiograficznych oraz wspiera zasadnicze znaczenie zachowania akademickiej wolności i otwartej debaty.
The article aims to summarise the main trends in the development of post-Soviet Ukrainian historiography and to place them within the broader context of contemporary challenges facing the Humanities, including the growing impact of “identity politics”. The author argues for the significance of contextualizing analysis of historiographical debates and supports the crucial importance of preserving academic freedom and open discussion.
Źródło:
Kwartalnik Historyczny; 2021, 128, 1; 481-490
0023-5903
Pojawia się w:
Kwartalnik Historyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
JOACHIM LELEWEL WOBEC REFORMACJI. SYNTEZY I PODRĘCZNIKI HISTORII POLSKI
JOACHIM LELEWEL AND THE REFORMATION. SYNTHESES AND POLISH HISTORY TEXTBOOKS
Autorzy:
Zieliński, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/490206.pdf
Data publikacji:
2017
Wydawca:
Instytut Teologiczno-Pastoralny im. św. bpa Józefa Sebastiana Pelczara
Tematy:
Joachim Lelewel, reformacja, historiografia polska, syntezy i podręczniki historii Polski
Joachim Lelewel, Reformation, Polish historiography, Syntheses, Polish history textbooks
Opis:
In the article the author presents the views of Joachim Lelewel – one of the greatest Polish historians of the 19th century – on the place and function of the Reformation in Poland. The subject of the analysis were Lelewel’s main synthetic and academic works. Joachim Lelewel as one of the first Polish historians drew attention to the complexity and origins of the Reformation; he also differentiated between the Reformation and the Protestantism. He noticed the influence of the Reformation on the development of Polish culture and emphasized the uniqueness of Polish tolerance against the background of bloody events in Western Europe. He also emphasized that the idea of Reformation was unfamiliar to the Polish people, as opposed to the tolerance, which was a part of our national identity. He saw the origins of intolerance and religious persecutions in the very Reformation itself. Lelewel at the early stage of his studies approached the Reformation in a more enthusiastic manner. In exile he became more sceptical, and in Catholicism he saw the power capable of uniting the nation.
Źródło:
Resovia Sacra : Studia Teologiczno-Filozoficzne Diecezji Rzeszowskiej; 2017, 24; 571-589
1234-8880
Pojawia się w:
Resovia Sacra : Studia Teologiczno-Filozoficzne Diecezji Rzeszowskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historia Polski wczesnonowożytnej w syntezach Jerzego Topolskiego
History of Early Modern Poland in Syntheses by Jerzy Topolski
Autorzy:
Wijaczka, Jacek
Mikulski, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2080782.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Jerzy Topolski
early modern
syntheses of the history of the Polish-Lithuanian Commonwealth 16-18th centuries
integral history
czasy wczesnonowożytne
syntezy dziejów państwa polsko-litewskiego w XVI–XVIII wieku
historia integralna
Nauki Humanistyczne i Społeczne
Opis:
Jerzy Topolski was one of the most outstanding Polish historians of the late 20th century. He wrote numerous works, including a synthesis of the history of the Polish-Lithuanian Commonwealth in the 16-18th centuries, which is the object of the analyses presented in this article.
Źródło:
Historyka studia metodologiczne; 2020, 50; 89-110
0073-277X
Pojawia się w:
Historyka studia metodologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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