Artículos de revistas: Recent submissions

Now showing items 761-780 of 4968

    • Seed dispersers as disease vectors: Bird transmission of mistletoe seeds to plant hosts 
      Martínez del Río, Carlos; Silva, A.; Medel Contreras, Rodrigo; Hourdequin, M. (1996)
      The relationship between mistletoes and birds has been studied from the perspectives of mutualism and seed dispersal. Here, we emphasize the role that avian dispersers play as agents of mistletoe seed transmission to plant ...
    • Tropane alkaloids from Schizanthus porrigens 
      Muñoz, O.; Cortés, S. (1998)
      Two new tropane alkaloids schizanthine Y and schizanthine Z have been isolated from the methanol extract of the leaves of Schizantus porrigens, in addition to the known compounds (-)-6β-angeloy-loxytropan-3α-ol and ...
    • Antimicrobial Activity of Natural 2-Benzoxazolinones and Related Derivatives 
      Bravo, Héctor R.; Copaja, Sylvia V.; Lazo, Waldo (American Chemical Society, 1997)
      Natural 2-benzoxazolinones BOA and MBOA and related synthetic derivatives inhibited the growth of Staphylococcus aureus, Escherichia coli, and Candida albicans. Both the electrophilic character of the nitrogen atom of the ...
    • General design theory for single-layer homogeneous absorber 
      Valenzuela, Alvaro Q.; Fernandez, F. Anfbal (1996)
      A simple and natural approach to the single-layer homogeneous absorber problem is developed and used to calculate previously unavailable universal design curves and equations for different orders of solutions. It is shown ...
    • In utero endoscopic treatment of posterior urethral valves: Preliminary experience 
      Quintero, R. A.; Johnson, M. P.; Muñoz, H.; Gonzalez, R.; Acosta, L.; Guevara-Zuloaga, F.; Arias, F.; Carreño, C.; Evans, M. I. (1998)
      Fetal cystoscopy was performed in nine fetuses with sonographic evidence of lower urinary tract obstruction and normal urinary electrolytes. Posterior urethral valves (PUV) were thought to be present in all cases. Endoscopic ...
    • Nitrogen mineralization in two unpolluted old-growth forests of contrasting biodiversity and dynamics 
      Pérez, Cecilia A.; Hedin, Lars O.; Armesto, Juan J. (1998)
      Studies in unpolluted, old-growth forests in the coastal range of southern Chile (42°30′S) can provide a baseline for understanding how forest ecosystems are changing due to the acceleration of nitrogen (N) inputs that has ...
    • Apyrase activity and changes in metabolites during germination and tuberization of Solanum tuberosum 
      Anich, Mario; Fanta, Nora; Mancilla, Marta; Kettlun, Ana María; Valenzuela, María Antonieta; Traverso Cori, A. (1990)
      Levels of adenine nucleotides, inorganic phosphate, starch and apyrase were measured during the growth of Solanum tuberosum tuber. The data obtained from potatoes sown in summer were compared with the data already reported ...
    • Cluster velocity distributions in a vapor at equilibrium 
      Soto Bertrán, Rodrigo; Cordero Simunovic, Patricio (American Institute of Physics Inc., 1998)
      We present the microscopic description of the vapor using the concept of cluster. Taking into consideration nonideal contributions, the distribution functions of every cluster species are obtained. From these distribution ...
    • TOXICITY AND FEEDING DETERRENCY OF HYDROXAMIC ACIDS FROM GRAMINEAE IN SYNTHETIC DIETS AGAINST THE GREENBUG, ... 
      Argandoña, Víctor H.; Corcuera, Luis J.; Niemeyer, Hermann M.; CAMPBELL, BRUCE C. (1983)
      2,4‐Dihydroxy‐7‐methoxy‐1,4‐benzoxazin‐3‐one (DIMBOA), the main hydroxamic acid isolated from maize extracts, increased the mortality of Schizaphis graminum when fed in artificial diets. Electrically‐monitored feeding ...
    • Insecticide and acaricide activities of polyhalogenated monoterpenes from chilean Plocamium cartilagineum 
      San Martín Barrientos, Aurelio; Negrete, Rosa; Rovirosa, Juana (1991)
      Four new alicyclic monoterpenes based on the 1-(2-chlorovinyl)-2,4,5-trichloro-1,5-dimethylcyclohexane skeleton were isolated from Plocamium cartilagineum from the Chilean coast, together with four known cyclic monoterpenes. ...
    • Friedolabdanes and other constituents from chilean Haplopappus species 
      Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1991)
      From the aerial parts of Haplopappus pulchellus two new labdanes and six friedolabdanes were isolated while H. arbutoides afforded in addition to known labdanes five new ones, two clerodanes and a cyperone derivative. ...
    • Value of time sensitivity to model specification 
      Gaudry, Marc J I; Jara Díaz, Sergio; Ortúzar, Juan de Dios (1989)
      We compare values of time obtained with linear utility functions used in LOGIT and HIERARCHICAL LOGIT specifications of a nine-mode passenger choice model estimated with disaggregate data from Santiago, Chile, and find ...
    • Effect of DIMBOA, an aphid resistance factor in wheat, on the aphid predator Eriopis connexa Germar ... 
      Martos, Agustin; Givovich, Arturo; Niemeyer, Hermann M. (Kluwer Academic Publishers-Plenum Publishers, 1992)
      DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one), a secondary metabolite found in cereal extracts, confers resistance in wheat to aphids. Its effect on beneficial organisms was tested on larvae of the aphid predator ...
    • Metabolism of uridine 5′-diphosphate-glucose in golgi vesicles from pea stems 
      Neckelmann, Guy; Orellana, Ariel (American Society of Plant Biologists, 1998)
      Uridine 5′-diphosphate-glucose (UDP-Glc) is transported into the lumen of the Golgi cisternae, where is used for polysaccharide biosynthesis. When Golgi vesicles were incubated with UDP-[3H]Glc, [3H]Glc was rapidly transferred ...
    • Solubilization of N-alkylpyridinium ions in anionic nematic lyomesophases 
      Weiss López, Boris; Vicencio-González, Jaime; Gamboa, Consuelo (1996)
      Deuterium quadrupole splittings from the aromatic ring of a series of linear N-alkylpyridinium-d5 ions, with alkyl chains from 1 to 16 carbon atoms, were measured using 2H-NMR spectroscopy. The pyridinium ions, 10% deuteriated ...
    • Triaquatris(μ-oxydiacetato)europium(III)-lanthanum(III) pentahydrate 
      Baggio, Ricardo; Garland, María Teresa; Perec, Mireille (Blackwell Munksgaard, 1998)
      The new heterobimetallic complex [{LaEu(oda)3(H2O)3.-5H2O} n] (oda = -O2CCH2OCH2CO2 -) has been synthesized and structurally characterized. Three tridentate oda ligands are coordinated to the smaller EuIII cation, while ...
    • Multi-peak bound states for nonlinear Schrödinger equations 
      Pino Manresa, Manuel del; Felmer Aichele, Patricio (Elsevier Masson SAS, 1998)
      In this paper we consider the study of standing wave solutions for a nonlinear Schrödinger equation. This problem reduces to that of finding nonnegative solutions of ε2Δu - V (x) u + (Latin small letter esh) (u) = 0 in Ω. ...
    • Fano resonance in quadratic waveguide arrays 
      Miroshnichenko, Andrey E.; Kivshar, Yuri S.; Vicencio Poblete, Rodrigo; Molina Gálvez, Mario (2005)
      We study resonant light scattering in arrays of channel optical waveguides in which tunable quadratic non-linearity is introduced as nonlinear defects by periodic poling of single (or several) waveguides in the array. We ...
    • 5-Methylcoumarin derivatives from Aphyllocladus denticulatus 
      Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1988)
      The aerial parts of Aphyllocladus denticulatus afforded, in addition to some widespread compounds, six 5-methylcoumarin derivatives isolated previo. © 1988.
    • Antialgal and antifungal activity of natural hydroxamic acids and related compounds 
      Bravo, Héctor R.; Lazo, Waldo (American Chemical Society, 1996)
      Natural hydroxamic acids and related compounds derived from 1,4-benzoxazin-3-one structures inhibited the growth of the alga Chlorella xanthella and the fungus Candida albicans. On the basis of structure-activity relationships ...