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Publisher: SciELO   (Total: 717 journals)

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Showing 401 - 600 of 717 Journals sorted alphabetically
Psicologia USP     Open Access   (SJR: 0.123, h-index: 6)
Psychology & Neuroscience     Open Access   (Followers: 15, SJR: 0.172, h-index: 8)
Psychology in Society     Open Access   (Followers: 2)
Psykhe (Santiago)     Open Access   (SJR: 0.194, h-index: 8)
Química Nova     Open Access   (SJR: 0.262, h-index: 50)
Radiologia Brasileira     Open Access   (Followers: 1, SJR: 0.211, h-index: 9)
RAE-eletrônica     Open Access   (Followers: 2)
RAM. Revista de Administração Mackenzie     Open Access  
RCOE     Open Access  
REAd : Revista eletrônica de administração     Open Access  
Región y Sociedad     Open Access  
Relações Internacionais (R:I)     Open Access  
Religião e Sociedade     Open Access   (Followers: 3)
Rem : Revista Escola de Minas     Open Access   (Followers: 1, SJR: 0.303, h-index: 9)
Revista Andaluza de Medicina del Deporte     Open Access   (Followers: 2, SJR: 0.152, h-index: 6)
Revista Archivo Médico de Camagüey     Open Access  
Revista Árvore     Open Access   (Followers: 1, SJR: 0.606, h-index: 20)
Revista Brasileira de Biologia     Open Access  
Revista Brasileira de Cardiologia Invasiva     Open Access   (SJR: 0.139, h-index: 5)
Revista Brasileira de Ciência Avicola     Open Access   (Followers: 1, SJR: 0.292, h-index: 12)
Revista Brasileira de Ciência do Solo     Open Access   (Followers: 1, SJR: 0.716, h-index: 37)
Revista Brasileira de Ciência Política     Open Access  
Revista Brasileira de Ciências do Esporte     Open Access   (Followers: 1, SJR: 0.147, h-index: 2)
Revista Brasileira de Ciências Farmaceuticas     Open Access  
Revista Brasileira de Ciências Sociais     Open Access   (Followers: 1, SJR: 0.138, h-index: 8)
Revista Brasileira de Cineantropometria & Desempenho Humano     Open Access   (SJR: 0.194, h-index: 13)
Revista Brasileira de Cirurgia Cardiovascular     Open Access   (Followers: 1, SJR: 0.303, h-index: 16)
Revista Brasileira de Cirurgia Plástica     Open Access   (Followers: 1)
Revista Brasileira de Coloproctologia     Open Access  
Revista Brasileira de Economia     Open Access   (Followers: 1, SJR: 0.215, h-index: 8)
Revista Brasileira de Educação     Open Access   (SJR: 0.202, h-index: 6)
Revista Brasileira de Educação Especial     Open Access   (SJR: 0.205, h-index: 6)
Revista Brasileira de Educação Física e Esporte     Open Access   (Followers: 1)
Revista Brasileira de Educação Medica     Open Access  
Revista Brasileira de Enfermagem     Open Access   (SJR: 0.268, h-index: 13)
Revista Brasileira de Engenharia Agrícola e Ambiental     Open Access   (Followers: 1, SJR: 0.596, h-index: 21)
Revista Brasileira de Engenharia Biomédica     Open Access   (SJR: 0.16, h-index: 4)
Revista Brasileira de Ensino de Fisica     Open Access   (SJR: 0.204, h-index: 6)
Revista Brasileira de Entomologia     Open Access   (Followers: 1, SJR: 0.402, h-index: 20)
Revista Brasileira de Epidemiologia     Open Access   (Followers: 2, SJR: 0.412, h-index: 19)
Revista Brasileira de Estudos de População     Open Access   (Followers: 1, SJR: 0.214, h-index: 7)
Revista Brasileira de Estudos Pedagógicos     Open Access  
Revista Brasileira de Farmacognosia     Open Access   (SJR: 0.447, h-index: 27)
Revista Brasileira de Fisiologia Vegetal     Open Access  
Revista Brasileira de Fruticultura     Open Access   (SJR: 0.442, h-index: 17)
Revista Brasileira de Geofísica     Open Access   (Followers: 2, SJR: 0.181, h-index: 13)
Revista Brasileira de Geriatria e Gerontologia     Open Access  
Revista Brasileira de Hematologia e Hemoterapia     Open Access   (Followers: 1, SJR: 0.302, h-index: 11)
Revista Brasileira de Historia     Open Access   (Followers: 3, SJR: 0.1, h-index: 5)
Revista Brasileira de Linguística Aplicada     Open Access  
Revista Brasileira de Medicina do Esporte     Open Access   (Followers: 1, SJR: 0.184, h-index: 17)
Revista Brasileira de Meteorologia     Open Access   (Followers: 1, SJR: 0.191, h-index: 3)
Revista Brasileira de Oftalmologia     Open Access   (SJR: 0.135, h-index: 8)
Revista Brasileira de Otorrinolaringologia     Open Access  
Revista Brasileira de Parasitologia Veterinaria     Open Access   (SJR: 0.535, h-index: 17)
Revista Brasileira de Plantas Medicinais     Open Access   (Followers: 1, SJR: 0.265, h-index: 17)
Revista Brasileira de Política Internacional     Open Access   (SJR: 0.188, h-index: 8)
Revista Brasileira de Psiquiatria     Open Access   (Followers: 1, SJR: 0.823, h-index: 36)
Revista Brasileira de Reumatologia     Open Access   (SJR: 0.354, h-index: 17)
Revista Brasileira de Saúde e Produção Animal     Open Access   (SJR: 0.243, h-index: 5)
Revista Brasileira de Saúde Materno Infantil     Open Access   (SJR: 0.198, h-index: 16)
Revista Brasileira de Sementes     Open Access  
Revista Brasileira de Terapia Intensiva     Open Access   (Followers: 1, SJR: 0.3, h-index: 6)
Revista Brasileira de Zoologia     Open Access  
Revista Brasileira de Zootecnia     Open Access   (Followers: 2, SJR: 0.436, h-index: 39)
Revista CEFAC     Open Access  
Revista Centro Azúcar     Open Access  
Revista Ceres     Open Access   (SJR: 0.433, h-index: 6)
Revista Chapingo. Serie horticultura     Open Access   (SJR: 0.127, h-index: 5)
Revista Chilena de Anatomia     Open Access  
Revista Chilena de Cardiología     Open Access  
Revista Chilena de Cirugia     Open Access   (SJR: 0.135, h-index: 6)
Revista Chilena de Derecho     Open Access   (Followers: 1, SJR: 0.223, h-index: 4)
Revista Chilena de Derecho Privado     Open Access  
Revista Chilena de Enfermedades Respiratorias     Open Access   (SJR: 0.15, h-index: 7)
Revista Chilena de Infectología     Open Access   (SJR: 0.208, h-index: 14)
Revista Chilena de Literatura     Open Access   (Followers: 2, SJR: 0.102, h-index: 3)
Revista Chilena de Neuro-Psiquiatria     Open Access   (SJR: 0.165, h-index: 9)
Revista Chilena de Nutricion     Open Access   (Followers: 1, SJR: 0.198, h-index: 10)
Revista Chilena de Obstetricia y Ginecologia     Open Access   (Followers: 1, SJR: 0.103, h-index: 8)
Revista Chilena de Pediatria     Open Access   (SJR: 0.139, h-index: 11)
Revista Chilena de Radiologia     Open Access   (Followers: 1, SJR: 0.101, h-index: 4)
Revista Ciência Agronômica     Open Access   (SJR: 0.578, h-index: 14)
Revista Ciencias Técnicas Agropecuarias     Open Access  
Revista Científica Ciencia Médica     Open Access  
Revista Científica General José María Córdova     Open Access  
Revista Clínica de Medicina de Familia     Open Access   (Followers: 4)
Revista Clínica de Periodoncia, Implantología y Rehabilitación Oral     Open Access   (Followers: 1)
Revista Colombiana de Anestesiología     Open Access   (Followers: 2, SJR: 0.151, h-index: 5)
Revista Colombiana de Antropologia     Open Access   (Followers: 2, SJR: 0.113, h-index: 2)
Revista Colombiana de Biotecnología     Open Access   (Followers: 1)
Revista Colombiana de Educación     Open Access  
Revista Colombiana de Entomología     Open Access   (Followers: 1, SJR: 0.21, h-index: 11)
Revista Colombiana de Estadística     Open Access   (SJR: 0.419, h-index: 6)
Revista Colombiana de Matemáticas     Open Access   (Followers: 1, SJR: 0.102, h-index: 1)
Revista Colombiana de Psicología     Open Access   (SJR: 0.121, h-index: 3)
Revista Contabilidade & Finanças     Open Access  
Revista Costarricense de Cardiología     Open Access  
Revista Costarricense de Psicología     Open Access  
Revista Cubana de Anestesiología y Reanimación     Open Access   (Followers: 1)
Revista Cubana de Angiología y Cirugía Vascular     Open Access  
Revista Cubana de Cirugía     Open Access   (SJR: 0.12, h-index: 4)
Revista Cubana de Endocrinología     Open Access  
Revista Cubana de Enfermería     Open Access   (Followers: 2, SJR: 0.117, h-index: 4)
Revista Cubana de Estomatologí­a     Open Access   (SJR: 0.11, h-index: 4)
Revista Cubana de Farmacia     Open Access   (Followers: 1, SJR: 0.119, h-index: 5)
Revista Cubana de Hematología, Inmunología y Hemoterapia     Open Access   (SJR: 0.119, h-index: 5)
Revista Cubana de Higiene y Epidemiología     Open Access   (SJR: 0.101, h-index: 7)
Revista Cubana de Información en Ciencias de la Salud     Open Access   (SJR: 0.188, h-index: 5)
Revista Cubana de Informática Médica     Open Access  
Revista Cubana de Investigaciones Biomédicas     Open Access   (Followers: 1, SJR: 0.101, h-index: 7)
Revista Cubana de Medicina     Open Access   (Followers: 2, SJR: 0.132, h-index: 6)
Revista Cubana de Medicina General Integral     Open Access   (Followers: 1, SJR: 0.156, h-index: 9)
Revista Cubana de Medicina Militar     Open Access   (Followers: 1, SJR: 0.1, h-index: 7)
Revista Cubana de Medicina Tropical     Open Access   (SJR: 0.141, h-index: 14)
Revista Cubana de Obstetricia y Ginecología     Open Access   (SJR: 0.101, h-index: 8)
Revista Cubana de Oftalmología     Open Access   (Followers: 1)
Revista Cubana de Ortopedia y Traumatología     Open Access   (SJR: 0.1, h-index: 4)
Revista Cubana de Pediatrí­a     Open Access   (SJR: 0.192, h-index: 7)
Revista Cubana de Plantas Medicinales     Open Access   (Followers: 1, SJR: 0.168, h-index: 8)
Revista Cubana de Salud Pública     Open Access   (SJR: 0.253, h-index: 7)
Revista da Educação Física : UEM     Open Access   (SJR: 0.141, h-index: 3)
Revista da Escola de Enfermagem da USP     Open Access   (Followers: 2, SJR: 0.284, h-index: 19)
Revista da Faculdade de Educação     Open Access  
Revista da Sociedade Brasileira de Fonoaudiologia     Open Access  
Revista da Sociedade Brasileira de Medicina Tropical     Open Access   (SJR: 0.476, h-index: 40)
Revista de Administração Contemporânea     Open Access  
Revista de Administração de Empresas     Open Access   (Followers: 1, SJR: 0.207, h-index: 6)
Revista de Administração Pública     Open Access   (SJR: 0.209, h-index: 9)
Revista de Análisis Económico     Open Access   (SJR: 0.132, h-index: 2)
Revista de Antropologia     Open Access   (Followers: 4)
Revista de Bioética y Derecho     Open Access  
Revista de Biología Marina y Oceanografía     Open Access   (SJR: 0.334, h-index: 16)
Revista de Biología Tropical     Open Access   (Followers: 2, SJR: 0.378, h-index: 27)
Revista de Ciencia Politica     Open Access   (Followers: 2, SJR: 0.168, h-index: 9)
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciências Agrárias     Open Access  
Revista de Ciencias Médicas de Pinar del Río     Open Access  
Revista de Ciencias Sociales     Open Access  
Revista de Derecho     Open Access   (Followers: 1, SJR: 0.164, h-index: 4)
Revista de Derecho (Coquimbo)     Open Access  
Revista de Economia Contemporânea     Open Access   (SJR: 0.117, h-index: 4)
Revista de Economía del Caribe     Open Access  
Revista de Economia e Sociologia Rural     Open Access   (Followers: 2, SJR: 0.248, h-index: 7)
Revista de Economía Institucional     Open Access   (SJR: 0.113, h-index: 3)
Revista de Economia Poli­tíca     Open Access   (Followers: 1, SJR: 0.274, h-index: 10)
Revista de Estudios Historico-Juridicos     Open Access   (Followers: 1, SJR: 0.1, h-index: 3)
Revista de Estudios Sociales     Open Access   (Followers: 1, SJR: 0.143, h-index: 4)
Revista de Filosofia     Open Access   (SJR: 0.11, h-index: 3)
Revista de Geografía Norte Grande     Open Access   (Followers: 1, SJR: 0.15, h-index: 7)
Revista de Gestão Costeira Integrada     Open Access  
Revista de Historia Americana y Argentina     Open Access  
Revista de Ingeniería     Open Access  
Revista de la Asociación Española de Neuropsiquiatría     Open Access  
Revista de la Ciencia del Suelo y Nutricion Vegetal     Open Access  
Revista de la Construcción     Open Access   (SJR: 0.259, h-index: 4)
Revista de la Facultad de Derecho y Ciencias Políticas     Open Access  
Revista de la Sociedad Boliviana de Pediatría     Open Access  
Revista de la Sociedad Española de Enfermería Nefrológica     Open Access   (SJR: 0.19, h-index: 4)
Revista de la Universidad Industrial de Santander. Salud     Open Access  
Revista de Medicina Veterinaria     Open Access  
Revista de Microbiologia     Open Access   (Followers: 1)
Revista de Nutrição     Open Access   (SJR: 0.246, h-index: 27)
Revista de Odontologia da UNESP     Open Access  
Revista de Odontologia da Universidade de São Paulo     Open Access  
Revista de Osteoporosis y Metabolismo Mineral     Open Access   (Followers: 1)
Revista de Otorrinolaringología y Cirugía de Cabeza y Cuello     Open Access  
Revista de Protección Vegetal     Open Access  
Revista de Psicología del Trabajo y de las Organizaciones     Open Access   (SJR: 0.211, h-index: 4)
Revista de Psiquiatria Clínica     Open Access   (Followers: 1, SJR: 0.192, h-index: 17)
Revista de Psiquiatria do Rio Grande do Sul     Open Access   (Followers: 1)
Revista de Salud Animal     Open Access  
Revista de Salud Pública     Open Access   (Followers: 1, SJR: 0.138, h-index: 16)
Revista de Saúde Pública     Open Access   (Followers: 1, SJR: 0.629, h-index: 56)
Revista de Sociologia e Polí­tica     Open Access   (Followers: 2, SJR: 0.247, h-index: 6)
Revista Dental Press de Ortodontia e Ortopedia Facial     Open Access   (Followers: 1)
Revista Diacrítica     Open Access  
Revista Direito GV     Open Access   (Followers: 1)
Revista do Colégio Brasileiro de Cirurgiões     Open Access   (SJR: 0.252, h-index: 11)
Revista do Departamento de Psicologia. UFF     Open Access  
Revista do Hospital das Clinicas     Open Access  
Revista do Instituto de Estudos Brasileiros     Open Access  
Revista do Instituto de Medicina Tropical de São Paulo     Open Access   (SJR: 0.485, h-index: 37)
Revista Dor     Open Access  
Revista EIA     Open Access   (Followers: 1)
Revista electrónica de investigación educativa     Open Access   (Followers: 1, SJR: 0.105, h-index: 3)
Revista Española de Cirugía Oral y Maxilofacial     Open Access   (Followers: 1, SJR: 0.121, h-index: 3)
Revista Española de Enfermedades Digestivas     Open Access   (Followers: 1, SJR: 0.344, h-index: 29)
Revista Española de Salud Pública     Open Access   (SJR: 0.269, h-index: 26)
Revista Española de Sanidad Penitenciaria     Open Access   (SJR: 0.15, h-index: 3)
Revista Estudos Feministas     Open Access   (SJR: 0.134, h-index: 9)
Revista Facultad de Ciencias Económicas: Investigación y Reflexión     Open Access  
Revista Facultad de Ingenieria - Universidad de Tarapaca     Open Access   (Followers: 1)
Revista Facultad de Ingeniería Universidad de Antioquia     Open Access   (Followers: 1, SJR: 0.133, h-index: 5)
Revista Facultad Nacional de Agronomía, Medellín     Open Access  
Revista Facultad Nacional de Salud Pública     Open Access  
Revista Gaúcha de Enfermagem     Open Access   (SJR: 0.197, h-index: 8)
Revista Geológica de América Central     Open Access  
Revista Geológica de Chile     Open Access   (Followers: 1)
Revista Gerencia y Políticas de Salud     Open Access   (SJR: 0.144, h-index: 4)

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Journal Cover Journal of the Chilean Chemical Society
  [SJR: 0.2]   [H-I: 21]   [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Online) 0717-9324
   Published by SciELO Homepage  [717 journals]
  • MORPHOLOGICAL, THERMAL, MECHANICAL AND SOLVENT UPTAKE OF CLAY/NYLON 6,6
           COMPOSITES

    • Abstract: ABSTRACT Clay/nylon 6,6 nanocomposites were prepared via solution casting technique. Kaolin clay was used as filler in polymer matrix. The morphological study presented that clay particles were dispersed and embedded well in nylon 6,6 matrix. The thermal stability of the clay/nylon 6,6 nanocomposites (20-50 °C) were higher than neat nylon 6,6 polymer. The polarized optical microscopy (POM) analyses showed that the spherulites size of clay/nylon 6,6 nanocomposite reduced highly as compare to neat nylon 6,6. The decrease in size of spherulites after loading the clay is might due to nucleation effect of kaolin clay in the nylon 6,6 polymer. The mechanical properties of nanocomposite were decreased as increased kaolin amount. The solvent uptake study presented that the nanocomposite uptake was low as compared to neat nylon 6,6. It was also found that the solvent uptake decreased as increased the amount of kaolin in nylon 6,6.
       
  • CAPTISOL® AS CHIRAL SELECTOR IN CAPILLARY ELECTROPHORESIS OF
           NON-ACIDIC DRUGS

    • Abstract: ABSTRACT Enantioseparation of nine extensively used chiral pharmaceutical substances from different pharmacological classes and with different structural characteristics has been investigated by capillary zone electrophoresis using Captisol® (sulfobuthylether-β-cyclodextrin sodium salt) as chiral selector. The influence on the chiral separation of several parameters including pH and concentration of the background electrolyte, chiral selector concentration, applied voltage, system temperature and injection parameters were studied and optimized in order to obtain increased chiral resolution and shorten analysis time. The results were compared with those obtained with native and derivatized neutral cyclodextrins (β-cyclodextrin and hydroxypropryl-β-cyclodextrin). All model molecules were resolved using Captisol® as chiral additive and optimized electrophoretic conditions, proving the efficiency of this anionic derivative of β- cyclodextrin as chiral selector in capillary electrophoresis.
       
  • STABILITY INDICATING RP-HPLC METHOD FOR SIMULTANEOUS DETERMINATION OF
           CIPROFLOXACIN AND DEXAMETHASONE IN BINARY COMBINATION

    • Abstract: ABSTRACT A simple and isocratic HPLC method with stability indicating nature was developed and then subsequently validated for simultaneous determination of ciprofloxacin and dexamethasone in pharmaceutical formulations, human serum and urine. Best chromatographic separations were attained within run time of 10 minutes using C8 as stationary phase and mixture of phosphate buffer and methanol (41:59 v/v) as mobile phase. The mobile phase was flowed at 1.5 mL min−1 with detection of both the analytes at 270 nm using photodiode array detector. Validation of the method was accomplished using specificity, linearity, accuracy, precision, robustness, LOD and LOQ. The method was found linear from 3-21 mg mL−1 for ciprofloxacin (r2 ≥ 0.999) and 1-7 mg mL−1 for dexamethasone (r2 ≥ 0.999). The %age recoveries of ciprofloxacin in spiked human urine and serum were ≥99% and ≥85% respectively, while for dexamethasone they were ≥97% in both matrices. The method proficiently separated the peaks of ciprofloxacin and dexamethasone from all types of interfering substances including degradation products/impurities with purity index ≥ 0.9998. The method thus was stability-indicating and can be employed for simultaneous analysis of ciprofloxacin and dexamethasone in complex matrices involving multiple components in the mixture.
       
  • CERIUM (IV) AMMONIUM NITRATE (CAN) AS A CATALYST IN WATER: A SIMPLE,
           PROFICIENT AND GREEN APPROACH FOR THE SYNTHESIS OF TETRAHYDROPYRIMIDINE
           QUINOLONES

    • Abstract: ABSTRACT We report here a facile, mild and efficient synthesis of functionalized tetrahydropyrimidine quinolones via one pot three-component condensation of aromatic aldehydes, N,N-dimethyl barbituricacid (barbituricacid), 4-hydroxy-1-methylquinolin-2(1H)-one and using a cerium ammonium nitrate (CAN) as a green catalyst in aqueous media-water (as a green ideal solvent) is described. The significant advantages of this protocol are short reaction time, simple work up procedure and reduced environmental impact, wide substrate scope; generally very good to excellent yields and starting materials are inexpensive and commercially available. The structures of these compounds were established on the basis of IR, 1H NMR, 13C NMR spectra.
       
  • GC-MS ANALYSIS OF THE ESSENTIAL OIL FROM ARTEMISIA aucheri BOISS.
           FRUITS

    • Abstract: ABSTRACT The essential oil content in the fruits of Artemisia aucheri growing wild in south of Iran was found to be 2.4% (v/w). The essential oil was analyzed by gas chromatography (GC) and GC–mass spectrometry (GC–MS). Characterization of individual components was performed using a commercial mass spectrometry library, and twenty nine components, representing 89.0% of the fruits essential oil were identified. This analysis showed the presence of three volatile components, including camphor (46.5%) and 1,8-cineol (23.4%) as the main compounds.
       
  • SYNTHESIS OF TETRASUBSTITUTD IMIDAZOLES CONTAINING INDOLE AND THEIR
           ANTIUREASE AND ANTIOXIDANT ACTIVITIES

    • Abstract: ABSTRACT Indole-based tetraarylimidazoles were prepared by multicomponent reaction of substituted 2-arylindole-3-carbaldehydes, benzil, substituted anilines and ammonium acetate in acetic acid. The new compounds were evaluated for their antiurease and antioxidant activity. The synthesized compounds exhibited potent antiurease activity.
       
  • SYNTHESIS OF CARBOXYL-MODIFIED Fe3O4@SiO2 NANOPARTICLES AND THEIR
           UTILIZATION FOR THE REMEDIATION OF CADMIUM AND NICKEL FROM AQUEOUS
           SOLUTION

    • Abstract: ABSTRACT In the present study, general and versatile method for the functionalization of silica coated Fe3O4 nanoparticles by surface carboxylic group have been established. We have shown that malic acid functionalized magnetic nanoparticles (MA-MNPs) are an effective sorbent material for toxic metals such as cadmium and nickel. This magnetic sorbent was characterized by X-ray diffraction, scanning electron microscope and infra-red spectra. The adsorption of all studied metal ions onto Malic acid functionalized magnetic nanoparticles was found to be dependent on pH. Batch adsorption equilibrium was very fast under optimum conditions and maximum monolayer capacity, Qm, obtained from Langmuir isotherm for Cd2+ and Ni2+ were 81.627 and 63.995mgg−1, respectively at 25°C. Adsorption data were fitted well to Langmuir and Freundlich isotherm (R2 ≈ 0.99). The malic acid grafted on Fe3O4@SiO2 enhanced the adsorption capacity because of the complexing abilities of the multiple hydroxyl and carboxyl groups with metal ions.
       
  • MOBILITY OF NONSTEROIDAL ANTI-INFLAMMATORY DRUGS IN SOILS WITH AND WITHOUT
           AMENDMENT OF BIOSOLID

    • Abstract: ABSTRACT Nonsteroidal anti-inflammatory drugs are widely used by humans as therapeutic agents to treat or prevent illnesses. Once ingested, part of them is excreted and enters the wastewater treatment plants generating biosolids that they may be used as fertilizing complements. The purpose of this study was to investigate the mobility of nonsteroidal anti-inflammatory drugs (ketoprofen, naproxen, diclofenac and ibuprofen) in soils and soils amended with biosolid. Studies of NSAIDs adsorption on two different soils were carried through batch equilibrium at room temperature. The mobility of NSAIDs in soils was studied through the use of leaching columns incorporating in the top section soil enriched with NSAIDs with and without biosolid. Ketoprofen, naproxen and ibuprofen were determined in the leaching columns. Anti-inflammatory mobility in the soil profile depends on the specific characteristics of each system soil-biosolid. In both soils there was little mobility of anti-inflammatory in the soil profile. In Linderos soil were found in greater quantity of Ibuprofen, naproxen and diclofenac that in Lonquén soil.
       
  • PHARMACEUTICAL COMPOUNDS DETERMINATION IN WATER SAMPLES: COMPARISON
           BETWEEN SOLID PHASE EXTRACTION AND STIR BAR SORPTIVE EXTRACTION

    • Abstract: ABSTRACT A variety of organic compounds and their metabolites used in pharmaceutical and personal care products (PPCP´s) are continuously introduced into the environment by domestic or industrial wastewater. Solid phase extraction (polymeric dinivylbenzene cartridge) and stir bar sorptive extraction (polydimethylsiloxane phase) methodologies were optimized for the determination of some selected PPCP´s in aqueous matrices. Carbamazepine, β estradiol, 3-(4-methylbenzylidene)champhor, benzophenone-1 and ibuprofen were extracted from aqueous samples and methanol was used as conditioning/eluting solvent. The variables involved in the extraction of the analytes in the original sample were studied, pH between 3 and 6 and sample volume between 50 and 500 mL were considered. Three concentration levels were extracted at the optimal conditions of pH 5 and 500 mL of sample volume with a recovery up to 89%. The determination was performed in a GC-MS, and a derivatization step using BSTFA+TMCS (99:1) was needed previous to the injection. Real samples from Maipo River and Villarrica Lake were analyzed with the optimized method, and concentrations below the detection limit were detected.
       
  • SECONDARY METABOLITES FROM PACHYSTROMA LONGIFOLIUM (NEES) I. M. JOHNST
           (EUPHORBIACEAE) AND EVALUATION OF ITS EXTRACTS AS CATHEPSINS INHIBITORS

    • Abstract: ABSTRACT In this work, four secondary metabolites were isolated from leaves of Pachystroma longifolium (Euphorbiaceae): loliolide, gallic acid, methyl protocatechuate and ethyl gallate. Their structures were established by physical and spectroscopic methods. The extracts of P. longifolium and the purified compounds were tested as cathepsins inhibitors and the extracts were active.
       
  • ROLE OF NANOPARTICLE SIZE ON PERFORMANCE OF PARTIAL OXIDATION OF BUTANE
           PROCESS TO SYNGAS

    • Abstract: ABSTRACT In this study, performance of nano structure Co/γ-Al2O3 catalysts in partial oxidation of butane was investigated. The catalysts were produced through chemical reduction and incipient wetness impregnation methods. Prepared catalysts were characterized with X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM),N2 adsorption/desorption (BET), temperature programmed reduction (TPR) and thermal gravity analysis (TGA). The characterization results confirmed the uniform dispersion of Co nanoparticles over γ-Al2O3 by using chemical reduction. Butane conversion, H2 and CO selectivities increased by decreasing of Co particle size due to higher dispersion and reducibility. The optimum value of H2/CO ratio of 2 obtained from chemical reduction technique. The results showed that the stability of catalyst produced by chemical reduction method was higher than incipient wetness impregnation ones.
       
  • SYNTHESIS, CHARACTERIZATION AND CRYSTAL STRUCTURE OF A NOVEL DECAVANADATE
           SALT, [V0.50(H2O)5]2[H2(V10O28)]·4(H2O)

    • Abstract: ABSTRACT A novel decavanadate salt, [V0.50(H2O)5]2[H2(V10O28)]·4(H2O), was obtained by the reaction of NH4VO3 with chinhydrone in an acidic medium. The title compound was characterized in the solid and solution phases by FT-IR, single crystal X-ray diffraction, voltammetry, UV-Vis., EPR and NMR measurements. The crystal data of the compound are: H30O42V11, triclinic, Pī, a = 8.4906 (4) Å, b = 10.4236 (5) Å, c = 11.2861 (6) Å, α = 68.490 (4)°, β = 87.251 (4)°, γ = 67.145 (4)°, V = 851.11 (8) Å3, and Z = 1. In the structure, [H2(V10O28)]4− anion is bound via hydrogen bonds to the dimer state of [V0.50(H2O)5]2+ cations and the water molecules. At this dimer moiety, it has been thought that the oxygen atoms of two water molecules form the bridges between two V(IV) center ions. The presence of high spin V(IV) (I = 7/2) in the compound was verified by EPR measurements. In addition, decavanadate unit gave a shoulder at about 400 nm on the UV-Vis. spectrum of the compound. Moreover, at the FT-IR spectrum, the symmetric and asymmetric stretching vibrations of the bridging V–O–V units were observed. On the cyclic voltammogram of the compound, two reduction peaks (V(V)-V(IV) and V(IV)-V(II) reduction steps, respectively) at −1.03 and −1.35 V were observed at the cathodic scan; however, one oxidation peak (V(II)-V(III) oxidation step) at −1.22 V showed at the anodic scan. NMR results also support that the synthesized salt includes the coordinated water molecules and hydroxo groups.
       
  • EFFECT OF HYDRATION AND PACKING ORDER ON LARGE UNILAMELLAR VESICLE FUSION:
           THE ROLE OF CHOLESTEROL

    • Abstract: ABSTRACT Several studies examining vesicle fusion have been reported in last decades and have established a number of factors favoring the process of vesicle fusion. To determine whether variations to the physicochemical properties of the membrane affect the process of vesicle fusion, we worked with binary and ternary mixtures of large unilamellar vesicles (LUVs). The selected binary models were dioleoyl phosphocholine-cholesterol (DOPC-chol) and disteraroyl phosphocholine-cholesterol (DSPC-chol), and the tertiary mixtures were phosphatidylcholine-phsophatidylethanolamine-cholesterol (PC-PE-Chol); phosphatidylcholine-sphingomyelin-cholesterol (PC-SM-Chol); and phosphatidylcholine-phosphatidylserine-cholesterol (PC-PS-Chol). For all these models, the effect of cholesterol content on the lamella physicochemical properties was determined using 1,6-diphenyl-1,3,5-hexatriene (DPH) anisotropy, generalized polarization of 2-dimethylamino-6-lauroylnaphthalene (Laurdan), and DPH fluorescence lifetime. To determine whether fusion of these vesicles varied according to lipid composition, the % mixing content and the % leakage were determined. Examining membrane incorporation using fluorescence steady-state and time-resolved probe assays in the models indicated that cholesterol content affected packing order and lamellar hydration. In most of the models, nonmonotonic variations were observed for these parameters, and these variations could be interpreted as increases in the proportion of ordered microdomains. When the proportion of these domains is higher, the packing order increases, and the lamellar water decrease. Similarly, the % mixing, which was assessed as a fusion parameter, also exhibited nonmonotonic behavior, indicating that the fusion process is enhanced at these concentrations of cholesterol. However, DSPC vesicles do not merge, so more than the presence of microdomains is required to stabilize fusion.
       
  • ELECTRODEPOSITION OF COBALT NANOCLUSTERS FROM AMMONICAL CHLORIDE SOLUTIONS
           ONTO HOPG ELECTRODES. A KINETICAL AND MORPHOLOGICAL STUDY

    • Abstract: ABSTRACT A kinetical study about the Co electrodeposition onto Highly Oriented Pyrolytic Graphite electrodes from an aqueous solution containing 0.01 M CoCl2 + 1 M NH4CI (pH = 7) was conducted at overpotential conditions through potentiostatic studies. The entire chronoamperograms were adequately predicted, considering the contribution to the total current of three different processes: a Langmuir-type adsorption process, a three-dimensional nucleation and growth and a proton reduction process. In all cases, the nucleation rate and the number of active nucleation sites are potential dependent. The Atomic Force Microscopy study revealed the presence of homogeneous cobalt clusters of less of 100 nm in height and 50 nm in diameter at different potential values.
       
  • A REVIEW OF RAMAN, SURFACE-ENHANCED RAMAN SCATTERING (SERS) AND RELATED
           SPECTROSCOPIC TECHNIQUES APPLIED TO BIOMOLECULES IN BIOMATERIALS

    • Abstract: ABSTRACT The development of new biomaterials has gained increasing attention in the last decade. One of the most important aspects in the development of these new materials is to understand the chemical cues presents in the native niche. Among all the techniques currently available for measuring those interactions, Raman spectroscopy offers a unique and non-invasive tool for exploring the behavior of the components within a given biomaterial and their surrounding microenvironment. This technique exploits the unique molecular vibrational fingerprints for pinpointing those interactions. The vibrational response can be improved to the single molecule level, in the presence of metal nanoparticles (NPs) with plasmonic properties (silver, gold and copper) in the so-called Surface-Enhanced Raman Scattering (SERS), which can be used for in-situ measurements. Another technique recently developed is the Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS), which overcomes signal contamination from chemical interactions between biomolecules and the metal surface; it does this by coating the metal surface with an inert layer of alumina or silica. In the present contribution, the role and the applications of Raman, SERS and related spectroscopic techniques in the study of biomolecules in biomaterials are reviewed and discussed.
       
  • ESTIMATION OF THE UNCERTAINTY IN THE QUANTIFICATION OF H2, N2, CO, CO2 AND
           CH4 IN GAS SAMPLES

    • Abstract: ABSTRACT The development of new biomaterials has gained increasing attention in the last decade. One of the most important aspects in the development of these new materials is to understand the chemical cues presents in the native niche. Among all the techniques currently available for measuring those interactions, Raman spectroscopy offers a unique and non-invasive tool for exploring the behavior of the components within a given biomaterial and their surrounding microenvironment. This technique exploits the unique molecular vibrational fingerprints for pinpointing those interactions. The vibrational response can be improved to the single molecule level, in the presence of metal nanoparticles (NPs) with plasmonic properties (silver, gold and copper) in the so-called Surface-Enhanced Raman Scattering (SERS), which can be used for in-situ measurements. Another technique recently developed is the Shell-Isolated Nanoparticle-Enhanced Raman Spectroscopy (SHINERS), which overcomes signal contamination from chemical interactions between biomolecules and the metal surface; it does this by coating the metal surface with an inert layer of alumina or silica. In the present contribution, the role and the applications of Raman, SERS and related spectroscopic techniques in the study of biomolecules in biomaterials are reviewed and discussed.
       
  • SYNTHESIS AND MORPHOLOGICAL CHARACTERIZATION OF NANOCOMPOSITE BASED ON
           ANODIC TiO2 NANOTUBES AND POLY(N-MALEOYL GLYCINE-CO-ACRYLIC ACID)

    • Abstract: ABSTRACT In this study, we examined the synthesis, and characterization of TiO2/poly(N-maleoylglycine-co-acrylic acid) (TiO2/poly(MG-co-AA)) nanocomposite. The nanocomposite was prepared by the dispersion of TiO2 nanotubes in a water solution of the polymer (3% w/w) and then it was lyophilized. The nanocomposite was characterized by FTIR and Raman spectroscopies. The incorporation of TiO2 nanotubes to the polymeric matrix was determined by transmission electron microscopy (TEM) from which TiO2 nanotubes in the inner of copolymer with diameters ranging between 90 and 100 nm were observed. The overall morphology of the previously synthetized nanotubes was determined by scanning electron microscopy (SEM). For the nanocomposite system, the morphology was studied by atomic force microscopy (AFM) from which a grain shape structure was observed. This process resulted in a new nanocompsite material with an average grain diameter estimated by SEM and AFM ranging between 210-240 nm. It was observed that the nanotubes were homogeneously dispersed within the polymeric matrix. The prepared material could be suitable in the design of electronic devices and additionally could have potential applications as biomaterial.
       
  • TUNING THE ELECTRONIC, PHOTOPHYSICAL AND CHARGE TRANSFER PROPERTIES OF
           SMALL D-A MOLECULES BASED ON THIENOPYRAZINE-TERTHIENYLS BY CHANGING THE
           DONOR FRAGMENT: A DFT STUDY

    • Abstract: ABSTRACT Four acceptor-donor organic conjugated molecules based on thieno[3,4-b]pyrazine-terthienyls were analyzed in order to explore the effect of the donor substituent on their molecular structures, electronic and optical properties. Density Functional Theory (DFT) and Time-Dependent Density Functional Theory (TD/DFT) calculations were carried out employing the B3LYP hybrid functional in combination with the 6-31G(d,p) basis set. The results suggests that the addition of electron-donating substituents to the conjugated molecules can diminish their energy gap value, which is beneficial to the photon harvesting. The lowest-lying absorption spectra of compounds substituted with electron donor groups exhibited a red-shift and a high oscillation factor compared with the unsubstituted molecule. Additionally, the ionization potential (IP), electron affinity (EA), reorganization energy (λ) and open-circuit voltage (Voc) of the molecules were evaluated. According to these values, the molecules show good photovoltaic properties, and efficient charge transfer for hole and electron and balanced charges.
       
  • EFFICIENT REMOVAL OF Cr(VI) BY POLYELECTROLYTE-ASSISTED ULTRAFILTRATION
           AND SUBSEQUENT ELECTROCHEMICAL REDUCTION TO Cr(III)

    • Abstract: ABSTRACT This work is focused on the removal of Cr(VI) ions from aqueous solution using water-soluble poly(diallyldimethylammonium chloride), PDDA, coupled to an ultrafiltration membrane of regenerated cellulose and subsequent electrochemical reduction of Cr(VI) to Cr(III). The removal of Cr(VI), using the washing mode, was studied as a function of pH, the molar ratio of polymer:Cr(VI), and the presence of interfering ions. The enrichment mode was used to determine the maximum retention capacity of the polymer, and the release of Cr(VI) and regeneration of the polymer were analysed by sorption-desorption process. Subsequently, the electroanalysis of Cr(VI) was conducted by linear sweep voltammetry and full electrolysis at controlled-potential in acidic media and in the presence of PDDA. The results show an efficient removal of Cr(VI) (95%, 30 mg/L in the feed) using PDDA at pH 9 and a polymer:Cr molar ratio of 20:1. The retention capacity of the polymer was decreased by the presence of sulphate anions. The maximum retention capacity of PDDA was 33 mg Cr/g polymer at pH 9. Using the sorption–desorption process, the results indicated that this water-soluble polymer can release Cr(VI) and be regenerated. Finally, the electrolysis of Cr(VI) to Cr(III) was performed successfully in the presence of PDDA.
       
  • ASSESSING THE BIOAVAILABILITY AND BIOACCESSIBILITY OF TOTAL ARSENIC AND
           ARSENIC SPECIES IN ENVIRONMENTAL SAMPLES

    • Abstract: ABSTRACT Studies on the bioavailability of As, of impacted vegetables; and As bioaccesibility in the edible parts of carrots (daucus carota), beets (beta vulgaris) and quinoa (chenopodium) growing in polluted soils thought “in vitro” gastrointestinal process; the As speciation both in the edible parts of vegetables and in their gastrointestinal extracts have been performed. Elemental analysis and As speciation have been performed by ICP-MS and LC-ICP-MS, respectively. The Arsenic recovery after the in vitro gastrointestinal digestion was from 98, 90 and 40% for carrots, beets and quinoa, respectively; with no significant transformation of original As species. These studies provide a clearer understanding of the impact that As and other contaminant elements may present in the population of this high polluted Chilean region.
       
  • ABSOLUTE CONFIGURATION OF MULINOLIC ACID

    • Abstract: ABSTRACT The structure of this mulinolic acid consists of a mulinane skeleton and the corresponding isopropyl, methyl, carboxyl and methyl groups at C3, C8, C5, C13, respectively, which are β-oriented, whereas the hydroxyl group at C13 is α-oriented. The cyclopentane (A), ciclohexane (B) and cicloheptene (C) rings are trans (A/B) and (B/C) cis fused, and in an envelope, chair, and twist conformation respectively. In the crystal the molecules are linked by two intermolecular O—H⋅⋅⋅O hydrogen bond forming bidimensional supramolecular structures with graph-set notation R44(12), R44(40), R66(46) and C44(46). The absolute configuration of the title compound has been determined from the refinement of the Flack parameter16. On this basis the absolute configuration was assigned as C3R, C5S, C8S, C9S, C10S and C13R.
       
 
 
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