oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 611 )

2018 ( 839 )

2017 ( 773 )

2016 ( 1112 )

Custom range...

Search Results: 1 - 10 of 462291 matches for " Issa A.;Soldi "
All listed articles are free for downloading (OA Articles)
Page 1 /462291
Display every page Item
Influência do comon?mero e do método de polimeriza??o na cinética de libera??o de fenobarbitona a partir de hidrogéis
Barcellos, Ivonete O.;Katime, Issa A.;Soldi, Valdir;Pires, Alfredo T. Nunes;
Polímeros , 2000, DOI: 10.1590/S0104-14282000000200013
Abstract: the release of water-soluble drugs from initially hydrated hydrogels matrices generally involves the simultaneous water absorption and drug desorption through a swelling-controlled diffusion mechanism. the diffusional behaviour of phenobarbitone from a hydrogel formed by a 2-hydroxyethylmethacrylate (hema) and methyl monoitaconate (mmi) copolymer was reported. the drug release into water was performed by high pressure liquid cromatography and the results showed that the phenobarbitone release from the hydrogels studies, considering the diffusion coefficient values did not change with the temperature and the polymerization method. the activation energy values suggested a more favorable phenobarbitone release from the hydrogels p(hema-co-mmi) polymerized in mass and bulk solution.
Influência do comon mero e do método de polimeriza o na cinética de libera o de fenobarbitona a partir de hidrogéis
Barcellos Ivonete O.,Katime Issa A.,Soldi Valdir,Pires Alfredo T. Nunes
Polímeros , 2000,
Abstract: A libera o de drogas solúveis em água a partir de matrizes de hidrogéis hidratados, geralmente envolve simultaneamente a absor o de água e a libera o da droga via mecanismo de difus o controlada. Foi analisado o comportamento difusional da fenobarbitona no hidrogel do copolímero 2-hidroxietil metacrilato (HEMA) e monoitaconato de metila (MMI). A libera o da droga no meio aquoso foi acompanhada por cromatografia líquida de alta press o e os resultados mostraram que a libera o da fenobarbitona a partir dos hidrogéis estudados, considerando-se os valores dos coeficientes de difus o, n o variou com a temperatura e com o método de polimeriza o. Os valores de energia de ativa o sugerem um favorecimento na libera o da fenobarbitona a partir dos hidrogéis de p(HEMA-co-MMI) polimerizados em massa e em solu o.
La vid y el vino en la costa central del Perú, siglos XVI y XVII
Soldi,Ana María;
Universum (Talca) , 2006, DOI: 10.4067/S0718-23762006000200004
Abstract: the cultivation of vineyards developed early in the coastal plains and middle valleys of the occidental slope of the andes, where weather and soil were favorable. spanish and creoles disregarded the royal and viceroyalty decrees which vainly tried to limit this crop and the production of local wines because they were a competition for the spanish imported wines. this article is about an area -pisco, ica, and nasca- where for a relatively brief time local indigenous lords, who were still "rich" and owned land, successfully dedicated to the cultivation of vineyards and the production of wines. there were also "indios naturales" ("common indians") dedicated to this activity, even though they were compelled to leave this activity after a few years. during the last decade of the xvi century and the first decades of the xvii century, many of the properties of the indigenous lords of the second and third generations, were transferred to spanish and creoles. this was done through sales or, in numerous cases, through donations or execution of wills in favor of different religious orders that were established in this area. i have cited some cases of donations which favored the company of jesus (jesuits). part of my research has been dedicated to the fast multiplication of vineyards in the valleys and plains of pisco, ica, and nasca, to the planting techniques, to the special care in the cultivation of grapes as well as to how the harvest was done. all the labor needed for these tasks were in charge of slaves that were imported in great numbers. free artisans were the most valued and were well paid and they were in charge of the fabrication of the containers for keeping and transporting wine by land and sea. from the end of the xvi century until well into the xviii century, in vast parts of the peruvian territory, there were recurrent natural disasters. volcanic eruptions, earthquakes and tsunamis greatly affected the vineyards and wine cellars causing the loss of crops which
La vid y el vino en la costa central del Perú, siglos XVI y XVII
Ana María Soldi
Universum : Revista de Humanidades y Ciencias Sociales , 2006,
Abstract: El cultivo de la vid se desarrolló temprano en los llanos costeros y en los valles medios de las vertientes occidentales andinas cuyas características de clima y suelo eran propicios. Espa oles y criollos habían hecho caso omiso de las ordenanzas reales y virreinales que trataron inútilmente de limitar este cultivo y la producción de vinos locales que competían con los importados de Espa a. En la zona de la que trata este trabajo - Pisco, Ica y Nasca- por un tiempo relativamente breve incluso los se ores indígenas locales que todavía eran "ricos" y poseían tierras se dedicaron con éxito a plantar vi as y a producir vino, y hasta hubo "indios naturales" que se habían dedicado a esta actividad, aunque estos últimos fueron obligados a desistir después de pocos a os. En la última década del siglo XVI y las primeras del siglo XVII muchas de las propiedades de los se ores indígenas de segunda y tercera generación se transfirieron a espa oles y criollos por ventas o, en numerosos casos, por donaciones o disposiciones testamentarias a diversas órdenes religiosas establecidas en el Perú. He citado aquí como ejemplo algunos de estos casos que favorecieron a la Compa ía de Jesús Parte de mi investigación está dedicada a cuán rápida fue la multiplicación de los vi edos en los valles y llanos de Pisco, Ica y Nasca, a las técnicas de plantío, a los cuidados de las vides así como se practicaban entonces, y a cómo se vendimiaba. La mano de obra necesaria para todas estas tareas estaba a cargo de esclavos que era necesario importar en número creciente. Quienes se dedicaban a la fabricación de los recipientes indispensables para guardar y transportar el vino por tierra o por mar eran más bien artesanos libres, muy solicitados y bien remunerados. Las alteraciones naturales como erupciones volcánicas, terremotos y maremotos que se produjeron recurrentemente a lo largo y ancho de una vasta zona del territorio del Perú de entonces, desde fines del siglo XVI hasta bien entrado el siglo XVIII, afectaron duramente a los vi edos y bodegas causando la pérdida de cosechas que fueron registradas en apenas una mínima parte The cultivation of vineyards developed early in the coastal plains and middle valleys of the occidental slope of the Andes, where weather and soil were favorable. Spanish and creoles disregarded the royal and viceroyalty decrees which vainly tried to limit this crop and the production of local wines because they were a competition for the Spanish imported wines. This article is about an area -Pisco, Ica, and Nasca- where for a relatively brief time local indigenous
CóMO RECUERDO A JOHN MURRA
Ana María Soldi
Chungará (Arica) - Revista de Antropología Chilena , 2010,
Abstract:
Poly(ethylene-co-methyl acrylate)/poly(caprolactone) triol blends for drug delivery systems: characterization and drug release
Kanis, Luiz A.;Soldi, Valdir;
Química Nova , 2012, DOI: 10.1590/S0100-40422012000200012
Abstract: poly(ethylene-co-methyl acrylate) (ema) and poly (caprolactone) triol (pcl-t) blends, a biodegradable aliphatic polyester with low molecular weight and moderate water solubility containing diltiazem hydrochloride (dz) were studied in terms of the thermal and morphological properties, and drug release mechanism. an increase in the pcl-t content in the ema/pcl-t/dz films decreased the degree of dz crystallinity. drug release from these films is temperature-dependent, and it is possible to modify the drug release rate by adjusting the ema/pcl-t composition of the blends. the mechanism of drug release is governed by pcl-t melting and pcl-t leaching from ema matrix.
Spectroscopic, thermal and magnetic properties of some transition metal complexes derived from 1-Phenyl-3-Substituted-4-Nitroso-5-Pyrazolones  [PDF]
Samir A. AbdelLatif, Yousry M. Issa
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.29127
Abstract: Complexes derived from some 1Phenyl3meth yl4nitroso5pyrazolone (L1), 1,3diphenyl4 nitroso5pyrazolone (L2) and 1phenyl3anilino 4nitroso5pyrazolone (L3) with Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ metal ions have been prepared. Structural investigation of the ligands and their complexes has been made based on elemental analysis, infrared (FTIR), ultraviolet and visible spectra (UVVis.), proton nuclear magnetic reso nance (1H NMR), magnetic susceptibility (?eff.) and thermal analysis (TG and DTG). The effect of solvents has been carried out in organic solvents of varying polarity. The observed transition energy and oscillator strengths were also calculated. The data obtained show that all of the prepared complexes contain water molecules in their coordination sphere. The investigated ligands acts as neutral bidentate ligands bonded to the metal ions through the two oxygen atoms of the carbonyl and nitroso groups. The isolated complexes behave as nonelectro lyte in DMF solution. The Mn2+, Co2+, Ni2+ and Cu2+ complexes show high spin configurations as the ground state. The high spin values of ma gnetic susceptibility may be due to the ligands being weak ligands. The Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ complexes exhibit an octahedral or distorted octahedral coordination with the investigated ligands.
Spectroscopic, thermal and magnetic properties of some transition metal complexes derived from 1-Phenyl-3-Substituted-4-Nitroso-5-Pyrazolones  [PDF]
Samir A. AbdelLatif,Yousry M. Issa
Natural Science (NS) , 2010, DOI: 10.4236/ns.2009.29127
Abstract: Complexes derived from some 1Phenyl3meth yl4nitroso5pyrazolone (L1), 1,3diphenyl4 nitroso5pyrazolone (L2) and 1phenyl3anilino 4nitroso5pyrazolone (L3) with Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ metal ions have been prepared. Structural investigation of the ligands and their complexes has been made based on elemental analysis, infrared (FTIR), ultraviolet and visible spectra (UVVis.), proton nuclear magnetic reso nance (1H NMR), magnetic susceptibility (?eff.) and thermal analysis (TG and DTG). The effect of solvents has been carried out in organic solvents of varying polarity. The observed transition energy and oscillator strengths were also calculated. The data obtained show that all of the prepared complexes contain water molecules in their coordination sphere. The investigated ligands acts as neutral bidentate ligands bonded to the metal ions through the two oxygen atoms of the carbonyl and nitroso groups. The isolated complexes behave as nonelectro lyte in DMF solution. The Mn2+, Co2+, Ni2+ and Cu2+ complexes show high spin configurations as the ground state. The high spin values of ma gnetic susceptibility may be due to the ligands being weak ligands. The Mn2+, Co2+, Ni2+, Cu2+ and Zn2+ complexes exhibit an octahedral or distorted octahedral coordination with the investigated ligands.
Classifying two-dimensional hyporeductive triple algebra
A. Nourou Issa
International Journal of Mathematics and Mathematical Sciences , 2006, DOI: 10.1155/ijmms/2006/13527
Abstract: Two-dimensional real hyporeductive triple algebras (h.t.a.) are investigated. A classification of such algebras is presented. As a consequence, a classification of two-dimensional real Lie triple algebras (i.e., generalized Lie triple systems) and two-dimensional real Bol algebras is given .
Utilising Refactoring To Restructure Use-Case Models
Ayman A. Issa
Lecture Notes in Engineering and Computer Science , 2007,
Abstract:
Page 1 /462291
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.