Browsing by Issue Date Artículos de revistas
Now showing items 621-640 of 2801
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(Life Technologies, Inc, 1999)Amplified Fragment Length Polymorphism (AFLP) analysis is an efficient ADN finger printing method based on selective amplification using PCR of restriction fragments from a total digest of genomic DNA. The AFLP technique ...
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(Kluwr Academic Publisher, 1999)Traditional identification of peach and nectarine varieties relies on the assessment of agronomic traits of the adult plant. This leads to a significant delay of time, constraints to breeders in the surveillance of germplasm ...
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(Sociedad Chilena de Química, 1999)A study of matrix effects arising from river water samples using C18 SPE columns in the determination of 38 pesticides having different chemical properties is presented. Recoveries from river water samples of different ...
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(Sociedad Chilena de Química, 1999)Se estableció la linealidad, sensibilidad analítica, límite de detección, límite de identificación y precisión de un método para la determinación simultánea por HPLC-DAD de trece plaguicidas pertenecientes a diferentes ...
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(Universidad de la Frontera. Facultad de Ciencias Agropecuarias, 1999)La dinámica del carbono se evaluó en suelos con problemas de acidificación y de alto contenido de Al activo. En estos estudios, además se incluyen los resultados obtenidos en sistemas de cero-labranza, para definir en ...
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(1999)[Mo(NNMePh)2Cl(PPh3)2]+CF 3SO3-·1/2H2O, [1]+CF3SO3-·1/2H 2O, has been synthesized by reaction of silver triflate, AgCF3SO3, with [Mo(NNMePh)2Cl2(PPh3)2] in CH2Cl2/CH3CN and subsequent isolation and recrystallization from ...
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Cyclic voltammetry and digital simulation of the electroreduction of ortho- and meta-nitro aryl ... (1999)Cyclic voltammetry (CV) and digital simulation methods are utilized to elucidate the mechanism of electrochemical reduction of a series of nitro aryl 1,4-dihydropyridines in protic (aqueous) and mixed media. The experimental ...
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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. ...
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Dissolution kinetics evaluation of controlled-release tablets containing propranolol hydrochloride (Marcel Dekker Inc., 1999)In the present research, controlled-release propranolol hydrochloride tablets were prepared for twice-daily administration, allowing more uniform plasmatic levels of the drug. Pharmaceutical formulations were prepared with ...
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(1999)The regiosomeric quinones 5-acetyloxymethyl-4,4,8-trimethyl-(5) and 8-acetyloxymethyl-4,4,5-trimethylanthracene-1,9,10(4H)-trione (6) were synthesized and their regiochemistry was assigned on the basis of the unambiguous ...
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(1999)A synthesis of N-(2-nitrobenzyl)acetanilide (5) and (11) from 2- nitrobenzaldehyde and aromatic amines is reported. The reaction of amides (5) and (11) with iron in acetic acid-ethanol-water provided the corresponding 3- ...
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(HeteroCorporation, 1999)New 4-Aryl-6-methyl-8-phenyl-2,3-dihydropyrazolo[3,4-b]diazepines and 4- aryl-8-methyl-6-phenyl-2,3-dihydropyrazolo[4,3-b]diazepines were obtained from the reaction of 4,5-diamino-3-methyl-1-phenylpyrazole 1 with one ...
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(Sociedad Chilena de Quimica, 1999)The EPR spectra of a series of mononuclear complexes [CpFe(dppe)SR]PF6 R = C6H5 (1), C3H7 (2), p-C6H4Br (3) and the binuclear [CpFe(dppe)-S-CH2CH2-S-CpFe(dppe)](PF6) 2 (4) were measured. All the paramagnetic complexes ...
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(1999)The dipole polarizability of a series of clusters of the type LinHm has been calculated using density functional methods. The study of the trends in the mean polarizability and the anisotropy are explained in terms of the ...
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(1999)St I is a toxin present in the Caribbean Sea anemone Stichodactyla helianthus which is highly hemolytic in the nanomolar concentration range. Exposure of the toxin to free radicals produced in the pyrolysis of 2,2'- ...
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(1999)The Δ-Λ isomerization of partially resolved [Ni(1,10-phen)2(S-aa)]+ systems, where S-aa is S-phenylalaninate, S-isoleucinate, S-leucinate, S-valinate, or S-alaninate, has been studied at 15,20 and 25°C in methanol as ...
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(1999)To confirm the geographic and ethnic segregation of HTLV-I and HTLV-II carriers in native populations in South America, we have conducted a seroepidemiological study of native populations in South America, including HTLV-I ...
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(1999)A direct and simple first derivative spectrophotometric method has been developed for the simultaneous determination of clidinium bromide and chlordiazepoxide in pharmaceutical formulations. Acetonitrile was used as solvent ...
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(Sociedad Chilena de Quimica, 1999)Experimental studies are made for some selected electronic transitions in Cs2NaY1-xPrxCl6 crystals within the full doping range of the crystal lattice (0 ≤ × ≤ 1). Decay curves are recorded for various temperatures between ...
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(1999)A comparative study of fish species identification was accomplished using three different electrophoretic techniques. Sarcoplasmic proteins were extracted from three related fish species and subjected to gel isoelectrofocusing ...