Publicaciones 2011-2020

@article{RN380,
title = {Characterization and Salt Response in Recurrent Halotolerant Exiguobacterium Sp Sh31 Isolated from Sediments of Salar De Huasco, Chilean Altiplano},
author = { F. Remonsellez and J. Castro-Severyn and C. Pardo-Este and P. Aguilar and J. Fortt and C. Salinas and S. Barahona and J. Leon and B. Fuentes and C. Areche and K.L. Hernandez and D. Aguayo and C.P. Saavedra},
url = {/brokenurl#<Go to ISI>://WOS:000445093500001},
doi = {10.3389/fmicb.2018.02228},
issn = {1664-302x},
year = {2018},
date = {2018-01-01},
journal = {Frontiers in Microbiology},
volume = {9},
abstract = {Poly-extremophiles microorganisms have the capacity to inhabit hostile environments and can survive several adverse conditions that include as variations in temperature, pH, and salinity, high levels UV light and atmospheric pressure, and even the presence of toxic compounds and the formation of reactive oxygen species (ROS). A halotolerant Exiguobacterium strain was isolated from Salar de Huasco (Chilean Altiplano), a well-known shallow lake area with variable salinity levels, little human intervention, and extreme environmental conditions, which makes it ideal for the study of resistant mechanisms and the evolution of adaptations. This bacterial genus has not been extensively studied, although its cosmopolitan location indicates that it has high levels of plasticity and adaptive capacity. However, to date, there are no studies regarding the tolerance and resistance to salinity and osmotic pressure. We set out to characterize the Exiguobacterium sp. SH31 strain and describe its phenotypical and genotypical response to osmotic stress. In this context, as a first step to characterize the response to the SH31 strain to salinity and to establish the bases for a molecular study, we proposed to compare its response under three salt conditions (0, 25, and 50 g/l NaCl). Using different physiology, genomic, and transcriptomic approaches, we determined that the bacterium is able to grow properly in a NaCl concentration of up to 50 g/l; however, the best growth rate was observed at 25 g/l. Although the presence of flagella is not affected by salinity, motility was diminished at 25 g/l NaCl and abolished at 50 g/l. Biofilm formation was induced proportionally with increases in salinity, which was expected. These phenotypic results correlated with the expression of related genes: fliG and fliS Motility); opuBA and putP (transport); glnA, proC, gltA, and gbsA (compatible solutes); ywqC, bdlA, luxS y pgaC (biofilm and stress response); and therefore, we conclude that this strain effectively modifies gene expression and physiology in a differential manner when faced with different concentrations of NaCl and these modifications aid survival.},
keywords = {altiplano, altitude bacillus-subtilis, bacterium, biofilm chilean communities, compatible environmental exiguobacterium, extremophile, formation, halophilic halotolerant, microbial moderately permafrost, pressure, psychrophilic responses saline siberian solutes, sp-nov., stress wetland},
pubstate = {published},
tppubtype = {article}
}

@article{RN198,
title = {Rhenium and Molybdenum Poorly Crystalline Disulfides and Their Mesophases with Hexadecylamine},
author = { J.A. Aliaga and J.F. Araya and R. Villarroel and H. Lozano and G. Alonso-Nunez and G. Gonz\'{a}lez},
url = {/brokenurl#<Go to ISI>://WOS:000345454600011},
doi = {10.1080/00958972.2014.975220},
issn = {0095-8972},
year = {2014},
date = {2014-01-01},
journal = {Journal of Coordination Chemistry},
volume = {67},
number = {23-24},
pages = {3884-3893},
abstract = {Sulfides of molybdenum and rhenium poorly crystalline were prepared by solvothermal oxidative decarbonylation of the respective metal carbonyls with sulfur using p-xylene as solvent. The same reaction, but in presence of hexadecylamine (HDA), was used for preparing the nanocomposites MoS2/HDA and ReS2/HDA. The products were analyzed by X-ray diffraction analysis, scanning electron microscopy, atomic force microscopy, and Fourier-transform infrared spectroscopy. The products, MoS2 and ReS2, are structurally similar but morphologically different: small undefined particles (150-300nm) and well-defined, almost perfect microspheres (0.4-2.8m), respectively. Preparations containing HDA lead to the corresponding layered nanocomposites. MoS2/HDA is a dark solid easily separable from the reaction mixture, while ReS2/HDA remains as a suspension in p-xylene, from which it is obtained by evaporating the solvent under vacuum. Both are layered species with basal spacing of 33.8 angstrom (Mo) and 30.4 angstrom (Re), respectively. The preparation of thin films of ReS2/HDA from its suspension by evaporating the solvent in the air produces small cylindrical particles of about 0.4x1.0m in size. Differences in the behavior of Mo and Re derivatives are discussed considering the coordination of the metal and the electronic structures of both metal disulfides.},
keywords = {amorphous autogenic carbon, composite deposition, elevated-temperature, in-situ materials, molybdenum mos2, nanoparticles, pressure, rhenium storage sulfide},
pubstate = {published},
tppubtype = {article}
}

@article{RN32i,
title = {Nanostructured Vox/Vo(Po4)(N) Using Solid-State Vanadium Containing Phosphazene Precursors: A Useful Potential Bi-Catalyst System},
author = { C. Diaz and M.L. Valenzuela and N. Yutronic and V. Villalobos and G. Barrera},
url = {/brokenurl#<Go to ISI>://WOS:000297250000012},
doi = {10.1007/s10876-011-0415-1},
issn = {1040-7278},
year = {2011},
date = {2011-01-01},
journal = {Journal of Cluster Science},
volume = {22},
number = {4},
pages = {693-704},
abstract = {Pyrolysis of molecular precursors containing vanadium organometallic and cyclic phosphazene affords mixtures of nanostructured vanadium oxides and pyrophosphates. The products from the molecular precursor [N3P3(OC6H5)(5)OC5H4N center dot Cp2VCl][PF6], and of the mixtures Cp2VCl2/N3P3(OC6H4CHO)(6) and Cp2VCl2/[NP(O2C12H8)](3) in several relationships 1:1, 1:3, 1:5 and 1:10, pyrolyzed under air and at 400 A degrees C and 600 A degrees C, give mixtures mainly V2O5 and VO(PO3)(2). Varied morphologies depending on the molecular or mixture precursors and of the temperature used were observed. Nanowires with diameters of approximate 40 nm were observed for the 1:5 Cp2VCl2/[NP(O2C12H8)](3) mixture pyrolyzed at 400 A degrees C, while the same mixture pyrolyzed at 600 A degrees C, affords xerogels of V2O5. The products were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), infra-red (IR) spectroscopy and X-ray diffraction (XRD). The preparation method constitutes a novel one-pot solid-state way to nanostructured materials with potential applications both in oxidative dehydrogenation of light hydrocarbons with V2O5, as well as alkenes oxidations with VO(PO3)(2).},
keywords = {autogenic cyclophosphazenes, derivatives, electrochemical elevated-temperature, gold, morphology, nanofibres nanoparticles, organometallic polyphosphazenes, pressure, properties, pyrolysis, template, vanadium},
pubstate = {published},
tppubtype = {article}
}