Browsing by Title Facultad de Ciencias
Now showing items 7873-7892 of 8178
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(1988)Examination of two close collections of Plocamium cartilagineum separated into plants bearing carposporophyte, tetrasporophyte and gametophyte yielded the same qualitative chemical composition, but the three reproductive ...
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(1997)The tectofugal pathway is a massive ascending polysynaptic pathway from the tectum to the thalamus and then to the telencephalon. In birds, the initial component of this pathway is known as the tectorotundal pathway; in ...
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(Elsevier Scientific Publishers Ireland Ltd., 1993-07-08)Two previously undescribed elemanolide esters, the 2-methylpropanoate and 2-methyl-2-propenoate of 11,13dehydromelitensin, were iso1ated in the course of a bioassay-guided fractionation from the aeria1 parts of ...
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(Natural Product Incorporation, 2017)Two new hygroline and tropane alkaloids, 4-hydroxybenzenepropanoylhygroline (1) and 3α,4β-dihydroxy-6β-angeloyoxytropane (2) have been isolated from the aerial parts of Schizanthus hookeri and S. tricolor, respectively, ...
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(Elsevier, 2004)From the resinous exudate of leaves of Haplopappus multifolius two new coumarins were isolated and assigned the structures 6-hydroxy-7-(5′- hydroxy-3′,7′-dimethylocta-2′,6′-dien)-oxycoumarin (1) and 6-hydroxy-7-(7′-hydro ...
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(Elsevier, 2008-05-20)For the isomerization of HOONO to nitric acid, a spin triplet reactive intermediate (HOONO)-H-3* was identified on a two state reactivity (TSR) potential energy surface. This bi-radical is postulated as one of the possible ...
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(2005)We analyze the properties and stability of two-color discrete localized modes in arrays of channel waveguides where tunable quadratic nonlinearity is introduced as a nonlinear defect by periodic poling of a single waveguide ...
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(Elsevier B.V., 2017)© 2016 Elsevier B.V.The ZnO/g-C3N4nanocomposites were synthesized by a single-step and scalable synthesis method through calcining the mixture of zinc acetate and urea. Two-dimensional shape, porous and carbon-doped ...
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(MDPI, 2022)The desire to harness solar energy to address current global environmental problems led us to investigate two-dimensional (2D) core-shell hybrid photocatalysts in the form of a 2D-TiO2-surfactant, mainly composed of fatty ...
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(Oxford University Press, 2020)In a previous paper, we reported simulations of the evolution of the magnetic field in neutron star (NS) cores through ambipolar diffusion, taking the neutrons as a motionless uniform background. However, in real NSs, ...
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(1974)
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(Sociedade Brasileira de Farmacognosia, 2017)© 2016 Sociedade Brasileira de Farmacognosia. High-resolution mass spectrometry is currently used to determine the mass of biologically active compounds in plants and UHPLC-Orbitrap is a relatively new technology that ...
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(MDPI, 2022)Himantormia lugubris is a Chilean native small lichen shrub growing in the Antarctica region. In this study, the metabolite fingerprinting and the antioxidant and enzyme inhibitory potential from this species and its four ...
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(2012)A metastable carbon nanotube with single, double, and triple bonds has been predicted from abinitio simulation. It results from the relaxation of an ideal carbon nanotube with chirality (2,1), without any potential barrier ...
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(SPECTROSCOPY LETTERS, 2005)Indoline-2-thione (BC), benzimidazole-2-thione (BN), benzoxazole-2-thione (BO), and benzothiazole-2-thione (BS) define an interesting series of aromatic compounds containing a NCS synthonic unit in a heterocyclic ring of ...
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(MARCEL DEKKER INC, 2001-01-12)Salicylideneaniline presents an electronic absorption band spectrum of complex patterns between 200 and 450 nm. However, we have successfully developed the electronic transition assignments of this molecular compound and ...
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(Universidad de Magallanes, 2020)
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UN MODELO HIDRODINÁMICO-BAROTRÓPICO PARA LOS FIORDOS AUSTRALES DE CHILE ENTRE LOS 41° S Y LOS 46° S (Comité Oceanográfico Nacional, 2008-07)Modelling coastal-estuarine ecosystems, characteristic of the southern fjords of Chile, should be based on hydrodynamic models accounting for the water circulation and its forcing. In this work we describe a barotropic, ...
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(2006)Metaphors are not just rhetorical devices, but also very powerful cognitive tools. We can check through learning experiments that they help us, not only to learn new ideas, but also that they provide very efficient means ...
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(2014)Se describe e ilustra una nueva especie, Bipinnula gabriel (Orchidaceae). Esta nueva especie habita en el tipo de bosque esclerófi lo costero de Chile Central, en la localidad de Putú, Constitución, Región del Maule. ...