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    Wyświetlanie 1-8 z 8
    Tytuł:
    Quantum Hall Ferromagnet in Magnetically-Doped Quantum Wells
    Autorzy:
    Andrearczyk, T.
    Jaroszyński, J.
    Wróbel, J.
    Karczewski, G.
    Wojtowicz, T.
    Papis, E.
    Kamińska, E.
    Piotrowska, A.
    Popović, D.
    Dietl, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036881.pdf
    Data publikacji:
    2003-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.Nq
    72.25.Dc
    73.61.Ga
    75.50.Pp
    Opis:
    The article reviews our recent studies on quantum Hall ferromagnetism in diluted magnetic semiconductors. We carried out magnetoresistance studies on modulation-doped, gated heterostructures of (Cd,Mn)Te/(Cd,Mg)Te:I. We put into evidence the formation of Ising quantum Hall ferromagnet with Curie temperature T$\text{}_{C}$ as high as 2 K. Quantum Hall ferromagnetism is manifested by anomalous magnetoresistance maxima. Moreover, magnitude of these spikes depends dramatically on the history of the sample, shows hysteresis when either magnetic field or gate voltage are swept, stretched-exponential time evolution characteristic of glassy systems, and strong Barkhausen noise. Our study suggests that these metastabilities stem from the slow dynamics of ferromagnetic domains.
    Źródło:
    Acta Physica Polonica A; 2003, 104, 2; 93-102
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cationic interactions in caesium uptake by king oyster mushroom (Pleurotus eryngii )
    Autorzy:
    Bystrzejewska-Piotrowska, G.
    Manjón, J.
    Pianka, D.
    Bazała, M.
    Urban, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147730.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bioaccumulation
    bioremediation
    caesium
    fungi
    mushrooms
    mycoextraction
    Pleurotus eryngii
    radionuclides
    Opis:
    In order to explain influence of common cations (K+, Na+ and Ca2+) on uptake and transport of caesium in macromycetes, a culture of a model mushroom species, king oyster mushroom (Pleurotus eryngii) was set up. Fructification in a growing chamber with stabilised temperature (18°C) and humidity (80%) was preceded by mycelial colonization of the sterilized barley seed medium packed into autoclavable plastic containers. Aliquots of test solutions, containing 0.1 mM caesium chloride carrier traced with 137CsCl and the selected ions, were dosed into the interphase between the container wall and the spawn block. This allowed to study influence of the added ions on the uptake of caesium in a way unaffected by the used growing medium, e.g. soil, as it was in the previous studies. The experiments demonstrated that the major amount of radiocaesium was biologically bound and accumulated in the fruitbodies to a higher extent (56 69%) than in the mycelium. Addition of 10 mM Na+ decreased the transfer factor for caesium (cap/soil) while addition of Ca2+ caused an increase of this value. The effect of potassium addition depended on its concentration in the solution. Also the Cs/K ratio in caps was significantly influenced by addition of 10 and 100 mM Na+. However, the Cs/K ratio in stipes was affected by Ca2+. Discrimination factors, calculated from specific activities (137Cs/40K cap d.w.)/(137Cs/40K stipe d.w.), were also changed after addition of the studied cations. Since the activities of caesium measured in the fruitbodies of single fungal species strongly depend on the content of co-supplied ions, further proofs should be achieved before using mushrooms as bioindicators of the soil caesium contamination.
    Źródło:
    Nukleonika; 2005, 50,suppl.1; 9-13
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary study of platinum accumulation in the fruitbodies of a model fungal species: king oyster mushroom (Pleurotus eryngii)
    Autorzy:
    Urban, P.
    Bazała, M.
    Asztemborska, M.
    Manjón, J.
    Kowalska, J.
    Bystrzejewska-Piotrowska, G.
    Pianka, D.
    Stęborowski, R.
    Kuthan, R. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/147784.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bioaccumulation
    bioremediation
    fungi
    heavy metals
    mushrooms
    mycoextraction
    platinum
    Opis:
    A model species of saprophytic fungus, king oyster mushroom (Pleurotus eryngii), was cultivated on barley substrate supplied with [Pt(NH3)4](NO3)2, under well defined conditions. The samples of the collected fruiting bodies were digested and analyzed for total platinum content by means of ICP-MS. The results proved that platinum is not accumulated in the fruitbodies of Pleurotus eryngii for a wide range of Pt concentrations in the culture substrate (100 1000 ppb Pt in 50 ml of water solution added to ca. 450 g of hydrated barley seeds per container). Observable levels of Pt were only found in the fruitbodies obtained from the medium contaminated with 10000 ppb (10 ppm) platinum solution. This demonstrates significant difference in the effectiveness of platinum extraction in fungi and plants, which are capable to accumulate platinum even when supplied at lower concentration (<500 ppb). It also shows different physiological pathways of platinum and other elements which are easily accumulated in the fruitbodies of the same species.
    Źródło:
    Nukleonika; 2005, 50,suppl.1; 63-67
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Izoksazolidynowe analogi nukleozydów
    Isoxazolidine analogues of nucleosides
    Autorzy:
    Kokosza, K.
    Piotrowska, D. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/171674.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    1,3-dipolarna cykloaddycja
    nitrony
    izoksazolidyny
    analogi nukleozydów
    nukleozasady
    C-nukleozydy
    homonukleozydy
    nukleozydy
    fosfonylowane nukleozydy
    psiko-nukleozydy
    aktywność przeciwwirusowa
    aktywność przeciwnowotworowa
    1,3-dipolar cycloaddition
    nitrones
    isoxazolidines
    nucleoside analogues
    nucleobases
    C-nucleosides
    homonucleosides
    nucleosides
    phosphonylated nucleosides
    psico-nucleosides
    antiviral activity
    anticancer activity
    Opis:
    Compounds having isoxazolidine moiety are of special interest since they show a broad spectrum of biological activity, including anticancer [1–5], antiviral [6], antibacterial [7–9] and antifungal activities [9–12]. Extensive studies on isoxazolidine moiety containing compounds resulted in discovery of several potentially antiviral and anticancer drugs (e.g. pyridemine-A 1 [2, 3], as well as isoxazolidines substituted with thymine and 5-fluorouracil 52a (AdT) [38–40] and 59 [(–)-AdFU] [41–43], respectively). In this review the most spectacular examples of the synthesis of isoxazolidine analogues of nucleosides are discussed and their biological activity is emphasized.
    Źródło:
    Wiadomości Chemiczne; 2012, 66, 11-12; 1041-1070
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    C-nukleozydy : synteza i aktywność biologiczna
    C-nucleosides : synthesis and biological activity
    Autorzy:
    Grabkowska-Drużyc, M.
    Piotrowska, D. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/172646.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    analogi nukleozydów
    C-nukleozydy
    homo-C-nukleozydy
    heterocykliczne C-nukleozydy
    acykliczne C-nukleozydy
    aktywność biologiczna
    nucleoside analogues
    C-nucleosides
    homo-C-nucleosides
    heterocyclic C-nucleosides
    acyclic C-nucleosides
    biological activity
    Opis:
    Studies on synthesis and biological activity of modified nucleoside and nucleotide analogues have been an active field of research in medicinal chemistry for years [1, 2]. High biological activity of naturally occurring C-nucleosides, for example showdomycin 5, formycins A 41 and B 42 motivated many research groups to study their analogues and structurally similar compounds. Furthermore, since C-nucleosides lack N-glycosidic bond they are more resistant to enzymatic hydrolysis [3]. This review collects selected methods of synthesis of C-nucleoside analogues which were analyzed to point out the most interesting and inspiring synthetic strategies, in many cases based on contemporary achievements. These strategies first of all take advantage of the formation of the C–C bond between the anomeric carbon atom of the sugar or pseudosugar moieties and the carbon atom of the modified nucleobases. Less common approach relies on the de novo construction of heterocyclic rings employed as nucleobase substitutes. Though years many new compounds sometimes of significant structural complexity have been obtained and characterized to find several examples endowed with high antiviral and cytostatic activity. The biological activity of the C-nucleoside analogues screened so far encourages us to continue a search for new potential drugs within compounds equipped with this attractive structural motif.
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 3-4; 197-225
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reakcja Niementowskiego
    The Niementowski reaction
    Autorzy:
    Łysakowska, M.
    Piotrowska, D. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/172007.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    reakcja Niementowskiego
    chinolina
    chinazolina
    chinazolin-4-on
    kwas antranilowy
    Niementowski reaction
    quinoline
    quinazoline
    quinazolin-4-one
    anthranilic acid
    Opis:
    The Niementowski reaction depends on the fusion of anthranilic acid with carbonyl compounds or amides and dates back to the end of the nineteenth century. Numerous variations of the reaction components and modifications of the reaction conditions have appeared in the literature through years. Besides anthranilic acid other synthons including: methyl o-aminobenzoate [25], o-nitrobenzoic acid [26], o-acylaminobenzamide [21], o-aminobenzamide [27], o-aminobenzonitrile [28], isatoic anhydride [29], benzoxasinone [30, 31] have been employed as well. Replacement of the amide component with either amine [9, 32], nitrile [33], imidate [34], thioamide [35], amidine [36], aldehyde [37] or carboxylic acid [28] have also been reported. To increase yield and to reduce the reaction time a number of variables in reaction conditions have been investigated. The best results have been achieved by implementation of a microwave irradiation [38]. The Niementowski reaction and its variants have found widespread use in pharmaceutical and agrochemical fields for the synthesis of compounds containing quinoline and quinazoline systems which are present in a number of natural and synthetic alkaloids [12, 13] and many drugs [1–5].
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 5-6; 369-390
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1’-homonukleoz(t)ydy : synteza i aktywność biologiczna
    1’-homonucleos(t)ides : synthesis and biological activity
    Autorzy:
    Gotkowska, J.
    Piotrowska, D. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/171503.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    analogi nukleozydów
    1’-homonukleoztydy
    podstawione tetrahydrofurany
    modyfikowane monosacharydy
    aktywność biologiczna
    nucleoside analogues
    1’-homonucleostides
    substituted tetrahydrofurans
    modified monosaccharides
    biological activity
    Opis:
    Long-lasting interest in the synthesis of nucleos(t)ide analogues is dictated by hope to obtain compounds possessing antibacterial, antiviral and antitumor activities [1, 2]. Introduction of a methylene linker between an anomeric carbon and the nucleobase nitrogen atom produces a new class of compounds called 1’-homonucleos(t)ides as potentially active analogues. Although a sugar ring in nucleosides can be replaced by several cyclic or even acyclic moieties we focus attention on compounds containing the tetrahydrofuran ring. Since methods of attachment of nucleobases are limited to their alkylation with appropriate compounds and the de novo synthesis we discussed various synthetic approaches to substituted tetrahydrofuranes in racemic or optically pure forms. Various pentose and hexose derivatives were employed as starting materials and their transformations into the final sugar frameworks were detailed, thus revealing the importance of these class of compounds. To prepare deoxysugars Barton-McCombie reaction sequence was applied. A significant number of final 1’-homonucleos(t)ides were screened for antiviral and cytotoxic activity to identify a few very potent compounds. Thus, phosphonates trans- and cis-138a were as active against HCMV as ganciclovir. In addition trans- -138a inhibited the proliferation of several murine and human cancer cell lines with IC50s in the μM range. 1’-Homonucleosides 64b and 66b exhibited selective antiviral activity against HSV-1 TK– and HSV-2 TK– (MIC = 8–12 μg/mL). Compound 129 was found active against HCV (EC = 6.31 μM) and reduced growth of CCRF-CEM cells with IC50 = 5.73 μM. Despite limited activity observed so far for the known 1’-homonucleos( t)ides and their analogues, they deserve further interest both from the synthetic point of view and biological potential inherent in molecules having nucleobase scaffolds.
    Źródło:
    Wiadomości Chemiczne; 2016, 70, 5-6; 319-351
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Obszary i zasoby perspektywiczne wystąpień rud metali i surowców chemicznych w Polsce na mapach w skali 1 : 200 000 wraz z ich oceną surowcową oraz ograniczeniami środowiskowymi i zagospodarowania przestrzennego
    The prospective areas and resources of metal ores and chemical raw materials in Poland on the maps at a scale of 1 : 200,000 with their resource assessment in relation to environmental and spatial conflicts
    Autorzy:
    Mikulski, S. Z.
    Oszczepalski, S.
    Czapowski, G.
    Gąsiewicz, A.
    Sadłowska, K.
    Markowiak, M.
    Sztromwasser, E.
    Bukowski, K.
    Giełżecka-Mądry, D.
    Strzelska-Smakowska, B.
    Paulo, A.
    Michniewicz, M.
    Radwanek-Bąk, B.
    Chmielewski, A.
    Mądry, S.
    Kuć, P.
    Sikorska-Maykowska, M.
    Koźma, J.
    Bliźniuk, A.
    Piotrowska, M.
    Kostrz-Sikora, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075530.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    obszary perspektywiczne
    rudy metali
    surowce chemiczne
    ograniczenia środowiskowe
    konflikt przestrzenny
    mapy
    Polska
    prospective areas
    metal ores
    chemical raw materials
    environmental constraints
    spatial conflict
    maps
    Polska
    Opis:
    As part of the tasks performed by the Polish Geological Survey (Polish Geological Institute - National Research Institute), 260 prospective maps (MOP) at a scale of 1 : 200,000 have been developed in the period of 2013-2015. These maps were designed for metal ores (Cu-Ag, Zn-Pb, Mo-W, Ni, Sn, Au, Pt, Pd and Zn oxide ore - galmans) and chemical raw materials (rock and potash salts, gypsum, anhydrite and native sulphur), in relation to the assessment of raw materials resources and environmental restrictions and land use planning. The total surface of prospective teritories projected onto the surface area is ~15.25 thousand km2 for metal ores and ca. 52.5 thousand km2 for chemical raw materials. The estimated resources of predicted ore deposits (prognostic and prospective) are approx. 42.2 million Mg of Cu and 75 thousands Mg of Ag (12 prospective areas), ca. 20 million Mg of Zn-Pb ores (in 4 prospective areas), 32 million Mg of Ni ores of weathering type (10 prospective areas), from 9.4 to 21.5 Mg of Au encountered by orogenic vein and metasomatic deposits (7 prospective areas), and ca. 22 million Mg of Sn ores. The estimated prognostic and prospective resources of chemical raw materials (at a depth of not more than 2000 m) are: ca. 4.059 trillion Mg of rock salt (68 prospective areas) and ca. 3638.1 million Mg of potash (12 prospective areas), as well as ca. 575.6 billion Mg of gypsum and anhydrite, and 202 million Mg of native sulphur (prognostic resources). In the assessment of environmental conflicts and land use planning, 125 information data sheets developed environmental conditions for prospective areas (with the exception of rock salts, which are discussed in the regional aspect). Development of the designated prospective areas may be important in the future to ensure the availability of raw material safety, not only for Poland, but also for the European Union, thus contributing positively to economic growth and prosperity of local communities.
    Źródło:
    Przegląd Geologiczny; 2016, 64, 9; 657--670
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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