Artículos de revistas: Recent submissions
Now showing items 4001-4020 of 4968
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(ELSEVIER, 1972)Hojas y tallos de Solanum pinnatum Cav., cosechados cerca de Longotoma (Aconcagua), fueron procesados para estudiar su contenido de glicoalcaloides y sapogeninas neutras esteroidales. Se pudo aislar solasonina, solamargina, ...
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(Laboratorios Mixim, S.A. de C.V., 1977-05-17)Liriodenine, anonaine. michelalbine. and (+) - reticuline, were isolated from the twigs of Annona Cherimolia ia Mill. (Annonaceae).
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(AMER CHEMICAL SOC, 2012)Photoisomerization of a protein bound chromophore is the basis of the light sensing and signaling responses of many photoreceptors. Z-to-E photoisomerization of the Pr Cph1 Delta 2 phytochrome has been investigated by ...
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(2012)The Chilotan Archipelago and surrounding areas of north-western Patagonia (41°–43°S, 72°–74°W) offer a unique opportunity to study the interplay between the recent genetic and paleoenvironmental evolution on temperate ...
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(2012)Premise of the study: The temperate forests of southern South America were greatly affected by glaciations. Previous studies have indicated that some cold-tolerant tree species were able to survive glacial periods in ...
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(Elsevier, 2012)In this work, TiO2–N powders were synthesized by high-energy ball milling, using commercial titanium dioxide (TiO2) in the anatase phase and urea to introduce nitrogen into TiO2 in order to enhance their photocatalytic ...
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(Chemical Society, 1986-05-13)The structure elucidation of dragabine (1) and nordragabine (2), the first derivatives of the novel azahomoaporphine skeleton, isolated from Guatteria sagotiana and Meiogyne virgata (Ann¡onaceae), is reported.
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(Comite de Investigaciones Científicas y Tecnológicas de la Universidad Técnica del Estado, 1971)Se separaron seis fracciones químicamente diferentes de hojas de Solanum malacoxylon Sendtner por extracción con solventes selectivos, y se ensayó la acción de estas fracciones sobre el metabolismode calcio y fósforo ...
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(Pergamon Journals Ltd., 1986-07-08)Callus cultures of 34 Berberís celllines representing 33 species were screened for alkaloids using TLC and HPLC. Jatrorrhizine was always found to be a major constituent; two B. stolonifera lines were the richest ...
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(Ministerio de Educación, Centro de Perfeccionamiento, Experimentación e Investigaciones Pedagógicas, 1976-08)
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(John Wiley & Sons, 1992-05-06)lhe ring opening reaction of (methylenedioxy)benzenes 1 with propanethiolate in DMF leads to products 2 and:or 3, depending on the nature of the electron-withdrawing substituent Z.
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(International Union of Cristallography, 1992-08-27)An important feature of the molecule is its non-planarity, the nitropropane' ando me.thoxyphenyl groups exhibiting a dihedral angle of 27.10 and torsion angles about the C(1)-C(7) bond of 26.6 and -155.80 •. The molecules ...
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(Birkhäuser Verlag, 1994-03-02)Boldine, an antioxidant alkaloid isolated from Peumus boldus, exhibits a dose-dependent anti-inflammatory activity in the carrageenan-induced guinea pig paw edema test with an oral EDso of 34 mg/kg. Boldine also reduces ...
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(Elsevier Science Ltd., 1995-01-16)Bioactivity guided fractionation of the dichloromethane extract from Psoralea glandulosa yielded the isolation of a diasteromeric mixture of cyc1obakuchiols A and B as possible anti-inflammatory active compounds.
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(Elsevier, 1992-10-16)The Stem bark of P. boldus, in addition to the previously reported benzylisoquinoline alkaloids. sensu lato, accumulates small amounts of their common precursor (R)- aud (to a lesser extent) (S )-coclaurine.The ...
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(Pergamon Journals LId, 1986-11-11)The stem bark of Oxandra ef. major, whieh eontains large amounts of 7,7'-bisdehydroaporphine alkaloids, has also yielded three eommonplaee steroids, retieuline, four known aporphinoids and the new azafluorenones darienine, ...
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(Taylor & Francis, 1994-10-13)üThe preparal.1on of B-alkoxYPhenethylamlne~ 3 lS described. As part of our ¡nteresl. in structure-actlvlty relatlonshtps of O$'~c.hl)tomimetic phenethylamínes I ond their ínteroctíons with serol.Onlnergic receptors 2, ...
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(WILEY-BLACKWELL, 2012-02)Aims: The primary goal of this study was to characterize the existence of a functional c-di-GMP pathway in the bioleaching bacterium Acidithiobacillus ferrooxidans. Methods and Results: A bioinformatic search revealed that ...
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(2012)This review covers classical and modern structural modifications of the alkaloid, the more recent (since 2007) syntheses of cytisine and analogues, and the pharmacology of these compounds, with emphasis on their interactions ...
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Observation of the gradual transition from one-dimensional to two-dimensional Anderson localization (OPTICAL SOC AMER, 2012-02-15)We study the gradual transition from one-dimensional (1D) to two-dimensional (2D) Anderson localization upon transformation of the dimensionality of disordered waveguide arrays. An effective transition from a 1D to a 2D ...
