Browsing by Title Artículos de revistas

Now showing items 2733-2752 of 2801

    • Vacuum frying reduces oil uptake and improves the quality parameters of carrot crisps 
      Dueik, V.; Robert Canales, Paz; Bouchon, P. (ELSEVIER, 2010)
      Recent consumer trends towards healthier and low fat products have had a significant impact on the snack industry. The objective of this study was to examine the most important quality parameters of vacuum and atmospheric ...
    • Validated HPLC method for the determination of ranitidine in plasma 
      Castro, A.; Arancibia, Aquiles; Romero, P.; Gai, María Nella (GOVI-VERLAG GMBH, 2003-10)
      A validated HPLC method for the determination of ranitidine in human plasma is presented. Sulfanilamide as internal standard (IS) was used. Plasma samples were purified by solid phase extraction (SPE) using a copolymeric ...
    • Validation of a UV spectrophotometric method for the determination of melatonine in solid dosage forms 
      Pérez, Renato F.; Lemus Gutiérrez, Igor; Bocic Vildósola, Ronny; Pérez, Mauricio; García, R. (AOAC INTERNATIONAL, 2001-09)
      The aim of the work described in this paper was to provide a fast, easy, inexpensive, precise, and accurate method for the determination of melatonine in solid pharmaceutical dosage forms. The developed method is based on ...
    • Valor nutritivo del alfilerillo (Erodiums) 
      Pennacchiotti Monti, Irma; Vargas U., Marta; Caballero D., Hernán (Chile. Ministerio de Agricultura. Instituto de Investigaciones Veterinarias, 1951)
      Con este trabajo se ha dado comienzo al estudio de nuestros forrajes de secano, en lo que respecta a sus cualidades nutritivas. Se ha escogido el Alfilerillo por ser este uno de los recursos alimenticios mas antiguos de ...
    • Valoración de azufre y iodo en alfalfa y heno de alfalfa 
      Pennacchiotti Monti, Irma; Vargas U., Marta; Gazmuri P., Gabriela (Chile. Ministerio de Agricultura, Instituto de Investigaciones Veterinarias, 1953)
      Es de vital importancia para la nutrición animal, conocer el contenido de azufre y iodo en la alfalfa común (Medicago sativa), por ser este forraje uno de los más ricos en principios nutritivos y elementos minerales, y ...
    • Valoración espectrofotométrica de la vitamina C en alfalfa y trébol y de carotenos en trébol 
      Pennacchiotti Monti, Irma; Yanssens Gutiérrez, Gabriela (Chile, Instituto de Investigaciones Agropecuarias, 1953)
      El presente trabajo tiene por objeto estudiar el contenido en vitamina C en Alfalfa verde, Heno de alfalfa y Trébol y además Caroteno en Trébol, empleándose el método espectrofotométrico, por presentar este mayores ventajas ...
    • Valoración fluorimétrica del contenido de tiamina en avena, cebada y maíz 
      Pennacchiotti Monti, Irma; Alarcón, César; Vargas U., Marta; Ahumada L., Eugenia (Chile, Instituto de Investigaciones Agropecuarias, 1953)
      El presente trabajo ha sido motivado por la importancia que tiene que llevar al conocimineto del contenido vitamínico de algunos cereales cultivados en el país, que sirven de base a la alimentación animal. Las determinaciones ...
    • Valoración microbiológica de riboflavina en alfalfa y heno de alfalfa 
      Pennacchiotti Monti, Irma; Vargas U., Marta; Flores del F., Carlos; Urba M., Rosa (Chile, Ministerio de Agricultura - Instituto de Investigaciones Veterinarias, 1952)
      De los diferentes métodos que se emplean para la valoración de la riboflavina en productos alimenticios, se distinguen tres por sus resultados mas homogéneos y satisfactorios: el fluorimétrico, el microbiológico y el animal ...
    • Variable-temperature solid-state N-15 cross-polarization magic-angle spinning nuclear magnetic resonance ... 
      Fernández, C. O.; Kogan Bocian, Marcelo; Valasinas, A.; Frydman, B. (AMER CHEMICAL SOC, 1998-07-10)
    • Variantes genéticas de los receptores adrenérgicos y enfermedades cardiovasculares 
      Díaz Araya, Guillermo; Chiong Lay, Mario; Moraga, Francisco; Castro Agüero, Pablo; Pérez, Osvaldo; Vukasovic Ramírez, José Luis; Nazzal Nazal, Carolina; Padilla, Ivonne; Corbalán, Ramón; Moreno, Mauricio; Lavandero González, Sergio (Sociedad Chilena de Cardiología y Cirugía Cardiovascular, 2001)
      El proyecto Genoma Humano ha logrado descifrar la secuencia completa del genoma, aportando una herramienta única para el estudio de la genética humana. Sin embargo, se ha observado cada vez más frecuentemente la aparición ...
    • Variation of the alkaloid content of Peumus boldus (boldo) 
      Fuentes Barros, Gonzalo; Castro Saavedra, Sebastián; Liberona, Leonel; Acevedo Fuentes, Williams; Tirapegui Calquín, Cristian; Mattar, César; Cassels Niven, Bruce (Elsevier, 2018-06)
      Eighteen alkaloids were detected in the bark, leaves, wood and roots of Peumus boldus, including traces of secoboldine, N-methylsecoboldine (boldine methine), glaucine and norreticuline, not reported previously as constituents ...
    • Variations in efficiencies of triplet state and exciplex formation following fluorescence quenching of ... 
      Olea, Andrés F.; Worrall, David R.; Wilkinson, Frank (2003)
      Data is presented on the quenching of 9,10-dicyanoanthracene by benzene derivatives in acetonitrile. The quenching occurs via a charge transfer mechanism with the quenching rate constants exhibiting a Rehm-Weller dependence ...
    • Vector dot product used for reduced three independent variables of multivariate regression to a linear ... 
      Cornwell, E. (SOC CHILENA QUIMICA, 2007-09)
      The aim of this work is based in the reduction of independent variables in multivariate regression analysis to one by means a vector dot product (E-3). By this way, it is omit the orthogonalized procedure to obtained valid ...
    • Very long-range correlations ((n)J(C,H) n > 3) in HMBC spectra 
      Araya Maturana, Ramiro; Pessoa Mahana, Hernán; Weiss López, Boris (NATURAL PRODUCTS INC, 2008)
      The structural elucidation of natural products and complex organic molecules relies heavily on the application of proton detected heteronuclear NMR. Among these techniques, the HMBC NMR experiment remains as the most popular ...
    • Vibrational and electronic spectroscopic detection and quantification of carminic acid in candies 
      Garrido, Carlos; Clavijo, Ernesto; Copaja, Sylvia; Gómez Jeria, Juan; Campos Vallette, Marcelo (Elsevier Ltd, 2019)
      Carminic acid (CA) contained in one kind of gummy candy was detected and quantified by using vibrational and electronic spectroscopy, respectively; the proposed methodology in solution is simple and rapid without sample ...
    • Vibrational spectra and normal coordinate analysis of diamminemercury(II) chloride with 14N/15N and H/D ... 
      Téllez, C.; Diaz, G. (1981)
      The IR and Raman spectra of solid diamminemercury(II) chloride with 14N/15N and H/D isotopic substitution have been measured. The spectra have been interpreted assuming D3d symmetry for the [Hg(NH3)2]2+ cations which have ...
    • Vibrational spectra of Caulerpin, a green algae pigment 
      Clavijo Campos, Ernesto; Weiss López, Boris; Rivera, L. Patricio (1996)
      FT-IR and FT-Raman spectra of Caulerpin, a green algae pigment, have been recorded. An assignment of the observed bands is proposed on the basis of previously reported vibrational spectra of similar structures. Intensity ...
    • Viscoelastic relaxation: A mechanism to explain the decennial large surface displacements at the Laguna del ... 
      Novoa, C.; Remy, D.; Gerbault, M.; Baez, J. C.; Tassara, A.; Cordova, L.; Cardona, C.; Granger, M.; Bonvalot, S.; Delgado, F. (Elsevier B.V., 2019)
      Silicic systems generate the most explosive eruptions on Earth. In contrast to basaltic systems, they can accumulate large volumes of magma without systematically erupting, confronting the classical interpretation that a ...
    • Viscoelastic relaxations in poly(ethylene-co-1-octadecene) synthesized by a metallocene catalyst 
      Benavente, Rosario; Pérez, E.; Yazdani-Pedram Zobeiri, Mehrdad; Quijada Abarca, Juan (ELSEVIER SCI LTD, 2002-12)
      The viscoelastic relaxations of four copolymers of ethylene and I-octadecene, with different comonomer contents, synthesized with a metallocene catalyst, have been analysed and compared to those of the corresponding ...
    • Visión retrospectiva de la importancia de la reglamentación de alimentos y drogas. 
      Pennacchiotti Monti, Irma (Sociedad Chilena de Tecnología de Alimentos, 1990)
      A través de la historia, los gobiernos han realizado una función importante en la protección de los alimentos, controlando las adulteraciones, contaminaciones, alteraciones y rotulaciones inadecuadas. desde tiempos remotos ...