Browsing by Issue Date Artículos de revistas
Now showing items 601-620 of 2801
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(WILEY-V C H VERLAG GMBH, 1998-11)Flutamide, 4-nitro-3-trifluoromethyl-isobutylanilide a synthetic antiandrogenic with therapeutic use in prostatic cancer, is electrochemically studied to propose a new electroanalytical alternative for its quantitative ...
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(WILEY-V C H VERLAG GMBH, 1998-11)Functionalization of isotactic poly(propylene) (PP) with dimethyl itaconate (DMI) as functional polar monomer using 2,5-dimethyl-2,5 -bis(tert-butylperoxy)hexane (L101) as radical initiator was carried out in both boiling ...
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(ELSEVIER SCIENCE BV, 1998-11-20)Basic fibroblast growth factor (bFGF) stimulated [H-3]thymidine incorporation at all stages of development, although the magnitude of this effect was the greatest in cells derived from pregnant mice. Cells primed with ...
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(ELSEVIER SCIENCE BV, 1998-11-26)A gene encoding laccase has been isolated from a genomic library of the white-rot basidiomycete Ceriporiopsis subvermispora constructed in Lambda GEM-ii. This gene (Cs-lcs1) contains an open reading frame of 2215 bp, ...
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(SOCIEDAD CHILENA DE QUIMICA, 1998-12)An X-ray diffraction study of the 7-bromo-5,8-dihydroxy-4,4-dimethyl-4H-naphthalen--1-one (1), obtained by bromination of 5,8-dihydroxy-4.4-dimethyl-4H-naphthalen-1-one with molecular bromine, gave unambiguous proof of its ...
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(SOCIEDAD CHILENA DE QUIMICA, 1998-12)This study reports on the transport and separation of Zn(II), Cu(II), and Ni(II) ions via a hollow fiber-type solid supported liquid membrane extractor. Alamine 336, a long chain tertiary amine was used as carrier extractant. ...
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(SOCIEDAD CHILENA DE QUIMICA, 1998-12)The crystal structure of C42H37O3P2Br has been determined by single crystal X-ray diffraction. The title compound is monoclinic, space group P2(1)/n (Nr. 14), with unit cell parameters a = 11.220(6), b = 14.345(10), c = ...
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(Instituto Antártico Chileno, 1999)En la hidrósfera las especies químicas se pueden encontrar básicamente en tres fases: disueltos, en el material particulado suspendido en el agua y en los sedimentos. Estas dos últimas fases son de vital importancia para ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 1999)Reaction of (CO)(9)Co-3(mu(3)-CCOOH) with metal trifluoroacetates leads to the isolation of Cr-2{mu-OOC-CCo3(CO)(9)}(2){mu-OOCCF3}(2)(THF)(2), 1, and Sm-2{mu-OOCCCo3(CO)(9)}(2){mu-OOCCF3}(4){(CO)(9)Co3CCOOH}(2)(THF)(2). ...
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(P J D PUBLICATIONS LTD, 1999)We have studied the enzymatic gelatinolytic activity of matrix metalloproteinases (MMPs) present in cerebrospinal fluid (CSF) of samples obtained from 67 individuals, twenty-one nonneurological patients (considered controls) ...
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(Thieme Stuttgart, 1999)Isocianates and isothiocyanates are readily transformed into the corresponding symmetric N,N'-disubstituted ureas and thioureas upon treatment with pyridine-water with no formation of side products. Evidence is shown for ...
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(Instituto Antártico Chileno, 1999)Los procesos que se desarrollan en un lago, se reducen a un modelo de entrada/salida. Las entradas son las cantidades de compuestos y agua que llegan desde el exterior y las salidas son los sumideros que conforman las ...
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(Temuco, Chile, Universidad de la Frontera, Facultad de Ciencias Agropecuarias, 1999)En los suelos evaluados en este estudio junto con la determinación de la dinámica del carbono y la actividad biológica se determinó el status de algunos macroelementos esenciales. Entre los nutrientes de importancia se ...
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(MARCEL DEKKER INC, 1999)A simple flow injection photometric method for the determination of copper was developed based on the formation and liquid-liquid extraction of the analyte-bathocuproine-perchlorate ternary complex. The analytical reaction ...
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(Chile, Universidad de la Frontera. Facultad de Ciencias Agropecuarias, 1999)Uno de los principales constituyentes del suelo es la materia orgánica que en los suelos del sur de Chile alcanza valores promedio de hasta 20%. Esta fracción orgánica enriquece el suelo, porque mejora sus características ...
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(Universita degli Studi di Pisa, Istituto di Chimica Agraria, 1999)La movilidad y disponibilidad de micro elementos o trazas de metales pesados es una función de su contenido en el substrato y está determinada principalmente por las formas químicas en que se presente en aquel (KABATAPENDIAS, ...
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(Instituto Antártico chileno, 1999)La contaminación del medio ambiente es uno de los problemas que enfrenta la humanidad del siglo XX. En principio, la contaminación afecta más fuertemente a las aglomeraciones urbanas; no obstante, en los últimos años se ...
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(Sociedad Chilena de Química, 1999)En este trabajo se propone un método para determinar cobre a bajos niveles de concentración empleando una configuración de flujo continuo que permite la automatización de la etapa de extracción líquido-líquido, mediante ...
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(MARCEL DEKKER INC, 1999)Soil samples from a field irrigated with untreated industrial and municipal wastewater for several decades and from a field not receiving wastewater (control) were analyzed for total copper (Cu) and zinc (Zn) and for the ...
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(MARCEL DEKKER INC, 1999)Dissolution profiles of theophylline (TP) from three types of sustained-release (SR) matrix tablets (plastic [PL], lipid [LP], and hydrophilic [HP]) in different dissolution media, with and without enzymes, were established ...