Publicaciones 2011-2020

@article{RN414,
title = {An Infrared, Sem and Xrf Study of the Paper of a 1588 Spanish Book},
author = { J.S. Gomez-Jeria and E. Clavijo and S. Gutierrez},
url = {/brokenurl#<Go to ISI>://WOS:000438848100213},
issn = {0975-8585},
year = {2018},
date = {2018-01-01},
journal = {Research Journal of Pharmaceutical Biological and Chemical Sciences},
volume = {9},
number = {4},
pages = {1581-1590},
abstract = {An infrared, scanning electron microscopy and X-ray fluorescence study was performed on the Spanish book entitled Treated of the True and False Prophecy printed in Segovia during 1588. Three small samples were taken from the margins of three pages. Two of them belong to the original book while the third one is from a page added later during the binding of the book. The first result is that the paper is contaminated with numerous metallic elements. The distribution of these contaminants in the three samples suggests that this process began after the binding of the book. The carbonate moiety of the calcium carbonate seems to have disappeared with the passing of time transformed in carbon dioxide. Al, K and S, components of potassium alum are detected by SEM and XRF analyses. Gelatin seems to be present because some IR bands of proline suggest that. There is an unsolved problem with some IR bands because of the fact that they can be ascribed to two different entities.},
keywords = {alum, analysis, archeology, cellulose, conservation, ft-ir gelatin, infrared margins paper postage potassium rags, sem, spain, spectra, spectroscopy, stamps, xrf},
pubstate = {published},
tppubtype = {article}
}

@article{RN399,
title = {Vibrational and Optical Properties of Czts Derivatives for Photovoltaic Applications: Synthesis of Cu2znsn1-Xgexs2se2 Compounds},
author = { C. Pinto and F. Lopez and A. Gald\'{a}mez and P. Barahona and S. Moris},
url = {/brokenurl#<Go to ISI>://WOS:000448954400011},
doi = {10.1016/j.solidstatesciences.2018.09.005},
issn = {1293-2558},
year = {2018},
date = {2018-01-01},
journal = {Solid State Sciences},
volume = {85},
pages = {76-82},
abstract = {Herein, we report the vibrational and optical properties of new Cu2ZnSn1-xGexS2Se2 solid solutions prepared by isomorphic substitution of a fraction of Se by S in Cu2ZnSn1-xGexSe4 (CZTGeSe) through ceramic method. The Raman spectra and x-ray diffraction analysis on samples confirms that they crystallize in Kesterite-type structure. The Raman peaks were analyzed by fitting of the spectra allowing identification the vibrational modes by comparison with experimental and theoretical data from CZTGeSe and CZTGeS end-members. The dependency between the amount of cation and chalcogen substituent in optical characterization shows band gap around of 1.36 eV, close to the optimum value for solar cells with high efficiency.},
keywords = {analysis, band-gap, cu2znsns4, czts, method, nanocrystals, nanoparticles, raman raman-scattering scattering, single-crystals, solar-cells, spectroscopy spray-pyrolysis},
pubstate = {published},
tppubtype = {article}
}

@article{RN336,
title = {Uhplc High Resolution Orbitrap Metabolomic Fingerprinting of the Unique Species Ophryosporus Triangularis Meyen from the Atacama Desert, Northern Chile},
author = { M.J. Simirgiotis and C. Quispe and A. Mocan and J.M. Villatoro and C. Areche and J. Borquez and B. Sepulveda and C. Echiburu-Chau},
url = {/brokenurl#<Go to ISI>://WOS:000397844800008},
doi = {10.1016/j.bjp.2016.10.002},
issn = {0102-695x},
year = {2017},
date = {2017-01-01},
journal = {Revista Brasileira De Farmacognosia-Brazilian Journal of Pharmacognosy},
volume = {27},
number = {2},
pages = {179-187},
publisher = {2016 Sociedade Brasileira de Farmacognosia. Published by Elsevier Editora Ltda.},
abstract = {High-resolution mass spectrometry is currently used to determine the mass of biologically active compounds in plants and UHPLC-Orbitrap is a relatively new technology that allows fast fingerprinting and metabolomics analysis. In this work, several phenolic compounds including eleven phenolic acids, two fatty acids, two chromones and fourteen flavones were rapidly identified in the methanolic extracts of aerial parts and flowers of the unique Chilean species Ophryosporus triangularis Meyen, Asteraceae, growing in the Atacama Desert by means of ultrahigh resolution liquid chromatography orbitrap MS analysis (UHPLC-PDA-OT-MS) for the first time. The UHPLC-MS fingerprint generated can be used for the authentication of this endemic species. The methanolic extracts of the aerial parts and flowers showedalso antioxidant capacities (65.34 +/- 1.32 and 52.41 +/- 1.87 mu g/ml in the DPPH assay, 184.88 +/- 13.22 and 196.80 +/- 13.28 mu mol TE/g dry weight in the ferric reducing power assay and 56.17 +/- 3.03 and 65.41 +/- 1.96% in the superoxide anion scavenging assay, respectively).},
keywords = {analysis, antioxidant benzofurans capacities, chilean constituents, dad-ms, driven esi-tof-ms, essential flavonoids, high liquid-chromatography, mass mass-spectrometry, oils, ophryosporus, orbitrap paposo performance phenolic-compounds, plants, resolution spectrometry, uhplc, valley},
pubstate = {published},
tppubtype = {article}
}

@article{RN374,
title = {Trend and Recovery of the Total Ozone Column in South America and Antarctica},
author = { R. Toro and C. Araya and F. Labra and L. Morales and R.G.E. Morales and M.A. Leiva},
url = {/brokenurl#<Go to ISI>://WOS:000415579000006},
doi = {10.1007/s00382-017-3540-1},
issn = {0930-7575},
year = {2017},
date = {2017-01-01},
journal = {Climate Dynamics},
volume = {49},
number = {11-12},
pages = {3735-3752},
abstract = {South America is one of the most vulnerable areas to stratospheric ozone depletion; consequently, an increased amount of UV radiation reaches the Earth's surface in this region. In this study, we analyzed the long-term trend in the total ozone column (TOC) over the southern part of the South American continent from 1980 to 2009. The database used was obtained by combining several satellite measurements of the TOC on a 1A degrees (latitude) x 1.25A degrees (longitude) grid. Analysis of the long-term trend was performed by applying the Theil-Sen estimator and the Mann-Kendall significance test to the deseasonalized time series. The long-term trend was also analyzed over several highly populated urban zones in the study area. Finally, multiple linear regression (MLR) modeling was used to identify and quantify the drivers of interannual variability in the TOC over the study area with a pixel-by-pixel approach. The results showed a decrease in the TOC ranging from -0.3 to -4% dec(-1) from 1980 to 2009. On a decadal timescale, there is significant variability in this trend, and a decrease of more than -10% dec(-1) was found at high latitudes (1980-1989). However, the trends obtained over much of the study area were not statistically significant. Considering the period from 1980 to 1995, we found a decrease in the TOC of -2.0 +/- 0.6% dec(-1) at latitudes below 40A degrees S and -6.9 +/- 2.0% dec(-1) at latitudes above 40A degrees S, for a 99.9% confidence level over most of the study area. Analysis of the period from 1996 to 2009 showed a statistically significant increase of 2.3 +/- 0.1% dec(-1) at high latitudes (> 60A degrees S), confirming the initial TOC recovery in the Antarctic. Despite evidence for initial recovery of the TOC in some parts of the study area between 1996 and 2009, the long-term increase from September to November is not yet statistically significant. In addition, large parts of the study area and most of the urban areas continue to show a decreasing trend in the TOC. The MLR results show that at high latitudes, the main driver of interannual variability in the TOC is the total effective amount of halogens, followed by the eddy heat flux.},
keywords = {analysis, arosa atmospheric chemistry, column, cycle, decadal depletion, dynamics, environmental chemistry, estimator, events, extratropical extreme interannual linear long-term multiple oscillation, ozone ozone, punta-arenas, quasi-biennial regression, sunspot theil-sen total trend variability, variation},
pubstate = {published},
tppubtype = {article}
}

@article{RN378,
title = {Raman of Indigo on a Silver Surface. Raman and Theoretical Characterization of Indigo Deposited on Silicon Dioxide-Coated and Uncoated Silver Nanoparticles},
author = { G. Corales and F. Celis and J.S. Gomez-Jeria and M. Campos-Vallette and J.J. Carcamo},
url = {/brokenurl#<Go to ISI>://WOS:000404931300004},
doi = {10.1080/00387010.2017.1324493},
issn = {0038-7010},
year = {2017},
date = {2017-01-01},
journal = {Spectroscopy Letters},
volume = {50},
number = {6},
pages = {316-321},
abstract = {Raman, surface-enhanced Raman scattering, and shell isolated nanoparticles-enhanced Raman scattering techniques were used to study the indigo-nanoparticle interaction nature. Silver nanoparticles were employed with and without a silicon dioxide spacer inert layer. The SERS spectral profile, obtained using silver nanoparticles, is different from the Raman one, which led to the proposition that the indigo-silver interaction is in the range of intermolecular interactions. SERS spectral reproducibility suggests identical organization and orientation of the analyte on the metal surface. The shell isolated nanoparticles enhanced Raman scattering spectrum of indigo, obtained by using silicon dioxide coated silver nanoparticles resulted similar to its Raman spectrum. This result indicates that the indigo structure is chemically unmodified by the silicon dioxide-coated silver surface. From the shell-isolated nanoparticles-enhanced Raman scattering experiments, the electromagnetic mechanism is proposed as the reason for the spectral enhancement. Theoretical calculations allow one to infer both the indigo-silver surface interaction nature and the orientation of indigo on the surface.},
keywords = {analysis, approximations, dioxide-coated fluorescence, identification, indigo, molecular-orbital nanoparticles, raman, scattering, sers sers, shiners, silicon silver spectroscopic theories},
pubstate = {published},
tppubtype = {article}
}

@article{RN319,
title = {Surface-Enhanced Raman Scattering and Theoretical Study of the Bilichromes Biliverdin and Bilirubin},
author = { F. Celis and M. Campos-Vallette and J.S. Gomez-Jeria and E. Clavijo and G.P. Jara and C. Garrido},
url = {/brokenurl#<Go to ISI>://WOS:000405754400003},
doi = {10.1080/00387010.2016.1154076},
issn = {0038-7010},
year = {2016},
date = {2016-01-01},
journal = {Spectroscopy Letters},
volume = {49},
number = {5},
pages = {336-342},
abstract = {The surface-enhanced Raman scattering spectra of biliverdin and bilirubin were obtained and analyzed; a physical silver ligand interaction was inferred. The structural conformation of biliverdin is practically the same when passing from the dry to solution relative to that observed in Raman solid. However, the surface effect induces a different molecular orientation on the surface in dry and in solution. The conformational structure of bilirubin is modified when passing from dry to solution conditions; the orientation of the analyte on the surface is different in both media. The carboxylate groups interact with the surface more closely in bilirubin than in biliverdin. The unsaturated methine bridge in biliverdin confers an additional stability by delocalizing the pi-electronic cloud. Both sides of the molecule could be in the same plane. On contrary, bilirubin with a tetrahedric carbon ( methylene bridge) confers the whole system a rather free rotation of each side of the whole molecule. Theoretical model calculations of the biliverdin and bilirubin onto the silver surface predict a nearly coplanar orientation of the whole molecules and non-bonded interaction.},
keywords = {analysis, bilichromes, bilirubin, biliverdin, dimethyl ester nanoparticles, normal-coordinate raman, sers, silver spectroscopic},
pubstate = {published},
tppubtype = {article}
}

@article{RN257,
title = {Crystal Structure and Raman Scattering Characterization of Cu2fe1-Xcoxsns4 Chalcogenide Compounds},
author = { F. Lopez-Vergara and A. Gald\'{a}mez and V. Manriquez and G. Gonz\'{a}lez},
url = {/brokenurl#<Go to ISI>://WOS:000364535900008},
doi = {10.1016/j.solidstatesciences.2015.09.010},
issn = {1293-2558},
year = {2015},
date = {2015-01-01},
journal = {Solid State Sciences},
volume = {49},
pages = {54-60},
publisher = {2015 Elsevier Masson SAS.},
abstract = {This work reports the synthesis by solid-state reaction of Cu2Fe1-xCoxSnS4 solid solutions. Crystal structures of Cu2Fe0.8Co0.2SnS4 and Cu2Fe0.6Co0.4SnS4 were investigated by single crystal X-ray diffraction. Both phases crystallize in the tetragonal stannite-type structure. The volume of the tetrahedral [MS4] (M = Fe, Co) presented the highest distortion, with Edge-Length Distortion (ELD) indices similar to 2% from the ideal tetrahedron. The powder X-ray diffraction (XRD) patterns of Cu2Fe1-xCoxSnS4 (x = 0.2, 0.4, 0.6 and 0.8) has been refined by Rietveld method. No secondary phases were detected in XRD patterns. An analysis of the vibrational properties of Cu2Fe1-xCoxSnS4 was performed using Raman scattering measurements. The Raman peaks were analyzed by fitting of the spectra and subsequently identifying the vibrational modes by comparison with experimental and theoretical data from Cu2FeSnS4 (CFTS) and Cu2CoSnS4 (CCTS) end-members. The spectra from Cu2Fe1-xCoxSnS4 show that there is a variation in the frequency of the main A1 peak at similar to 320 cm(-1) together with a decrease in the secondary mode intensity at similar to 285 cm(-1). Full Width at Half Maximum (FWHM) and the intensity of the Raman peaks reflect the high crystallinity of Cu2Fe1-xCoxSnS4 solid solutions. The oxidation states of the metals were confirmed by temperature-dependent magnetization measurements performed in the antiferromagnetic Cu2Fe1-xCoxSnS4 solid solutions.},
keywords = {analysis, cells chalcogenide, crystal cu2znsns4, raman stannite, structure},
pubstate = {published},
tppubtype = {article}
}

@article{RN209,
title = {Micro-Raman Spectroscopy of Decorated Pottery of the Diaguita Culture from Iv Region, Chile (9th-15th Century Ad)},
author = { F. Osorio and G. Diaz-Fleming and U. Martinez and M. Campos-Vallette and E. Clavijo and A.E. Aliaga and M.F. Espinosa and D. Bracchitta},
url = {/brokenurl#<Go to ISI>://WOS:000347833800020},
doi = {10.4067/S0717-97072014000300020},
issn = {0717-9707},
year = {2014},
date = {2014-01-01},
journal = {Journal of the Chilean Chemical Society},
volume = {59},
number = {3},
pages = {2619-2621},
abstract = {Raman spectroscopy pigments on decorated antique Chilean pottery belonging to the Diaguita's culture deposited in Museum of Limari, have been studied by using Raman spectroscopy. Four ceramic fragments from the unknown contexts were examined. Four colors were found with certainty: red, black, brown and white. Quartz and manganese (kempite) salts, as well as different types of oxide pigments: hematite, tenorite and possibly goethite, were identified.},
keywords = {analysis, ancient, archaeology, archaeometry, art ceramics, diaguita identification, iron-oxides, pigment pigments, raman spectroscopy},
pubstate = {published},
tppubtype = {article}
}

@article{RN128,
title = {Design, Synthesis, Binding and Docking-Based 3d-Qsar Studies of 2-Pyridylbenzimidazoles-a New Family of High Affinity Cb1 Cannabinoid Ligands},
author = { J.A. Mella-Raipan and C.F. Lagos and G. Recabarren-Gajardo and C. Espinosa-Bustos and J. Romero-Parra and H. Pessoa-Mahana and P. Iturriaga-Vasquez and C.D. Pessoa-Mahana},
url = {/brokenurl#<Go to ISI>://WOS:000318020100024},
doi = {10.3390/molecules18043972},
issn = {1420-3049},
year = {2013},
date = {2013-01-01},
journal = {Molecules},
volume = {18},
number = {4},
pages = {3972-4001},
abstract = {A series of novel 2-pyridylbenzimidazole derivatives was rationally designed and synthesized based on our previous studies on benzimidazole 14, a CB1 agonist used as a template for optimization. In the present series, 21 compounds displayed high affinities with K-i values in the nanomolar range. JM-39 (compound 39) was the most active of the series (K-iCB1 = 0.53 nM), while compounds 31 and 44 exhibited similar affinities to WIN 55212-2. CoMFA analysis was performed based on the biological data obtained and resulted in a statistically significant CoMFA model with high predictive value (q(2) = 0.710, r(2) = 0.998, r(pred)(2) = 0.823).},
keywords = {agonists, analogs, analysis, binding, cannabinoid, cb1 comfa derivatives, docking, molecular-field pharmacology, protease receptor, series, system},
pubstate = {published},
tppubtype = {article}
}

@article{RN97,
title = {Vibrational and Scaled Quantum Chemical Study of O,O-Dimethyl S-Methylcarbamoylmethyl Phosphorodithioate, Dimethoate},
author = { G. Diaz-Fleming and F. Celis and A. Aracena and M. Campos-Vallette and A.E. Aliaga and R. Koch},
url = {/brokenurl#<Go to ISI>://WOS:000301471600032},
doi = {10.1016/j.saa.2011.12.032},
issn = {1386-1425},
year = {2012},
date = {2012-01-01},
journal = {Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy},
volume = {89},
pages = {222-230},
publisher = {2011 Elsevier B.V.},
abstract = {Infrared and Raman spectra of O,O-dimethyl S-methylcarbamoylmethylphosphorodithioate, dimethoate, have been recorded. Density functional theory, DFT, with the B3LYP functional was used for the optimization of the ground state geometry and simulation of the infrared and Raman spectra of this molecule. Calculated geometrical parameters fit very well with the experimental ones. Based on the recorded data, the DFT results and a normal coordinate analysis based on a scaled quantum mechanical (SQM) force field approach, a complete vibrational assignment was made for the first time.},
keywords = {analysis, assignment basis, calculations, compounds, coordinate dft dimethoate, field, force force-constants, gaussian-type infrared, infrared-spectra, methods, molecular-orbital monosubstituted normal organic-molecules, phosphorus raman, sqm},
pubstate = {published},
tppubtype = {article}
}

@article{RN40b,
title = {Raman Spectroscopy in the Diagnosis of the Wall Painting History of Concepcion, Chile},
author = { T. Aguayo and E. Clavijo and F. Eisner and C. Ossa-Izquierdo and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000298581500013},
doi = {10.1002/jrs.2978},
issn = {0377-0486},
year = {2011},
date = {2011-01-01},
journal = {Journal of Raman Spectroscopy},
volume = {42},
number = {12},
pages = {2143-2148},
publisher = {2011 John Wiley & Sons, Ltd.},
abstract = {Pigments and fresco-related materials from the wall painting Historia de Concepcion by Gregorio De La Fuente in Concepcion, Chile were identified by Raman microscopy. The pigments were compared with those obtained from the artist's studio, and results allowed inference about subsequent interventions. Materials coming from processes such as salt efflorescence were also studied. The results contribute to the diagnosis of the current conservation state of the wall painting for its future restoration.},
keywords = {analysis, art, calcium, conservation, cultural-heritage, fluorescence ft-raman, identification, nondestructive of painting, pigment pigments, raman spectra, spectroscopy, wall work},
pubstate = {published},
tppubtype = {article}
}

@article{RN27d,
title = {Influence of Aluminum Oxide on the Prebiotic Thermal Synthesis of Gly-Glu-(Gly-Glu)(N) Polymer},
author = { P. Leyton and R.A. Zarate and S. Fuentes and C. Paipa and J.S. Gomez-Jeria and Y. Leyton},
url = {/brokenurl#<Go to ISI>://WOS:000290194500006},
doi = {10.1016/j.biosystems.2011.01.008},
issn = {0303-2647},
year = {2011},
date = {2011-01-01},
journal = {Biosystems},
volume = {104},
number = {2-3},
pages = {118-126},
publisher = {2011 Elsevier Ireland Ltd.},
abstract = {The effect of the aluminum oxide on the thermal synthesis of the glycine-glutamic acid (Gly-Glu-(Gly-Glu)(n) polymer is described. The thermal synthesis in the molten state was carried out in the absence and presence of the oxide. In both cases, the vibrational spectra showed characteristic group frequencies corresponding predominantly to a Gly-Glu-(Gly-Glu)(n) sequence in the polymeric structure. The theoretical spectral data support the experimental proposed Gly-Glu-(Gly-Glu)(n) sequence for the polymer. The SEM-EDX characterization of the solid phase involved in the thermal synthesis showed that the aluminum oxide participates as a site for nucleation and growth of the polymer, explaining the increase of 25% efficiency in the presence of aluminum oxide. Electrophoresis data show shorter polypeptide chains in the presence of aluminum oxide.},
keywords = {amino-acid-sequences, analysis, bond chemistry, conditions, crystalline diketopiperazine, earth formation formation, glutamic glycine ir-spectra, peptide prebiotic primitive pyroglutamic reaction, spectroscopy, synthesis, thermal vibrational},
pubstate = {published},
tppubtype = {article}
}