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    Wyświetlanie 1-4 z 4
    Tytuł:
    The magnetic field stimulation system applied on strawberry fruits
    Autorzy:
    Zaguła, G.
    Puchalski, C.
    Czernicka, M.
    Bajcar, M.
    Saletnik, B.
    Woźny, M.
    Szeregii, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/410837.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    magnetic fields
    strawberry
    monosaccharides
    firmness
    pole magnetyczne
    truskawki
    monosacharydy
    jędrność
    Opis:
    This paper presents an influence of three different magnetic fields stimulation systems for growing strawberry fruits: permanent magnetic field generated by neodymium magnets, ”high” strengths slow varying amplitudes magnetic fields generated by coreless solenoids supplied by autotransformer and low-frequency and low-amplitude sinusoidal magnetic fields generator created for this research. The system is controlled by computer and allows for an independent control of up to 10 induction coils inducing magnetic fields with amplitudes from 0.1μT to 150μT and frequencies from 0.1Hz to 100Hz. The proposed set-up was used during the growing seasons for strawberry plants stimulation. An increase in the extract level was observed in the case of the alternating magnetic field stimulation with the parameters: frequency – from 50Hz to 100Hz and amplitude – from 50μT to 100μT.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2017, 6, 1; 117-122
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    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:
    Metody określania struktury polisacharydów
    Methods for determining polysaccharides structure
    Autorzy:
    Samaszko-Fiertek, J.
    Kuźma, M.
    Dmochowska, B.
    Ślusarz, R.
    Madaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172410.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    polisacharydy
    monosacharydy
    degradacja oksydacyjna
    analiza metylacyjna
    acetoliza
    NMR
    magnetyczny rezonans jądrowy
    MS
    polysaccharides
    monosaccharides
    oxidative degradation
    methylation analysis
    acetolysis
    nuclear magnetic resonance (NMR)
    Opis:
    Sequencing of polysaccharides is difficult to achieve because of the heterogeneous nature of the polysaccharide structure, high molecular weight (the size of a polysaccharide varies between approximately 16,000 and 16,000,000 daltons (Da)), and polydispersity of the polymer chains. The following information is essential to determine the primary structure of a polysaccharide: • monosaccharide composition: nature and molar ratios of the monosaccharide building blocks; • relative configuration of monosaccharides: d or l; • anomeric configuration: α- or β-configuration of the glycosidic linkage; • ring size: presence and distinction of furanosidic and pyranosidic rings; • linkage patterns: linkage positions between the monosugars and branches; • sequences of monosaccharide residues in the repeating units; • substitutions: position and nature of OH–modifications, such as O–phosphorylation, acetylation, O-sulfation, etc.; • molecular weight and molecular weight distribution. A polysaccharide extracted from plant materials or food products is usually purified before being subjected to structural analysis. The first step of characterizing a polysaccharide is the determination of its purity, which is reflected by its chemical composition, including total sugar content, level of uronic acids, proteins, ash, and moisture of the preparation. The second step is the determination of monosaccharide composition, which will unveil structural information such as the number of monosaccharides present in the polysaccharide and how many of each sugar unit. NMR spectroscopy has become the most powerful and noninvasive physicochemical technique for determining polysaccharide structures. It can provide detailed structural information of carbohydrates, including identification of monosaccharide composition, elucidation of α- or β-anomeric configurations, establishment of linkage patterns, and sequences of the sugar units in oligosaccharides and/or polysaccharides. Monosaccharide composition can be determined also by analysis of totally acid hydrolyzed polysacharide using high performance liquid chromatography (HPLC) or gas chromatography (GC). The ring size and glycosidic linkage positions of sugar units in a polysaccharide could be established by methylation analysis and/or cleavage reduction. The anomeric configuration is conventionally determined by oxidation, and this method can be combined with mass spectrometry to obtain more structural information.
    Źródło:
    Wiadomości Chemiczne; 2016, 70, 5-6; 299-318
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Galactose monoacrylate as a new monomer in gelcasting process
    Monoakrylan galaktozy jako nowy monomer w procesie odlewania żelowego
    Autorzy:
    Szudarska, A.
    Mizerski, T.
    Szafran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352986.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlewanie żelowe
    glin
    monosacharydy
    monomery nietoksyczne
    gelcasting
    alumina
    monosaccharides
    deflocculants
    low-toxic monomers
    Opis:
    The present work shows the results of following the recently developed trend to design new low toxic monomers which can be applied in gelcasting process. New compound, 6-O-acryloyl-D-galactose (galactose monoacrylate) has been synthesised and its effectiveness as processing agent has been studied. The results are compared with those reported so far regarding applying some other new monomers - 3-O-acryloyl-D-glucose and glycerol monoacrylate in gelcasting technology. The influence of spatial structure of obtained monomers on rheological properties of alumina suspensions and properties of green bodies is discussed as well.
    Artykuł przedstawia wyniki badań dotyczących zastosowania nowozsyntezowanej akrylowej pochodnej galaktozy jako monomeru w procesie odlewania żelowego. Opracowano metode syntezy 6-O-akryloilogalaktozy oraz zbadano jej role i efektywność w procesie. Wyniki porównano z wcześniejszymi pracami z tego zakresu, dotyczącymi zastosowania innych nowych nietoskycznych monomerów – 3-O-akryloiloglukozy oraz monoakrylanu glicerolu, szukając wpływu budowy przestrzennej cząsteczek monomeru na właściwości reologiczne mas lejnych z tlenku glinu i właściwosci odlanych z nich wyrobów.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1211-1215
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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