Papers by Manuel Ernesto Vargas Orrego
ACS applied materials & interfaces, Jan 13, 2016
In order to obtain an antimicrobial gel, a starch based hydrogel reinforced with silica coated co... more In order to obtain an antimicrobial gel, a starch based hydrogel reinforced with silica coated copper nanoparticles (Cu NP) was developed. Cu NP were synthesized using a copper salt and hydrazine as a reducing agent. In order to enhance the Cu NP stability over time they were synthesized in a starch medium followed by a silica coating. The starch hydrogel was prepared using urea and water as plasticizers and it was imbibed with different concentrations of the silica coated Cu NP (Si-Cu NP). The obtained materials were characterized by FT-IR, EPR, SEM and rheometry. FT-IR and EPR spectra were used for the characterization of the Cu NP and Si-Cu NP confirming that a starch capping was formed around the Cu NP and demonstrating the stability of the copper nanoparticle after the silica coating step. The SEM images showed Cu NP, Si-Cu NP and hydrogel morphology. The particle size was polydisperse and the structure of the gels changed along with particle concentration. The increase of Cu N...
Cuicatlán a Pseudoeurycea mixteca siendo este el primer registro para el estado, García-Vázquez e... more Cuicatlán a Pseudoeurycea mixteca siendo este el primer registro para el estado, García-Vázquez et al. (2009) añaden 18 nuevas especies para el estado, entre los cuales están los anuros Incillius valliceps, Hyalinobatrachium fleischmanni, Eleutherodactylus leprus, Agalychnis callidryas, Dendropsophus microcephalus, Ptychohyla zophodes, Smilisca cyanostycta, Leptodactylus melanonotus y Lithobates vaillanti, las lagartijas Anolis cymbops, Anolis tropidonotus, Sphenomorphus cherriei stuarti, Xenosaurus grandis, y por último las serpientes Lampropeltis triangulum polizona, Leptodeira polysticta, Oxyrhopus petola, Micrurus diastema y Typhlops tenuis; en este mismo trabajo se reportan 16 notas de distribución de las especies Craugastor loky, Craugastor pygmaeus, Ecnomiohyla miotympanum, Scinax staufferi, Leptodactylus fragilis, las lagartijas Corytophanes henandezi, Hemidactylus frenatus, Sceloporus variabilis, Anolis laeviventris, Anolis sericeus, Scincella silvicola, y Ameiva undulata, y las serpientes Geophis semidoliatus, Imantodes cenchoa, Leptophis mexicanus, y Nina sebae. Solano-Zavaleta (2009) registran para el estado y amplían la distribución para Pseudoeurycea melanomolga y se amplía el rango de distribución para Pseudourycea gadovii. Melgarejo-Vélez et al (2010) amplían el rango de distribución para la rana Hyalinobatrachium fleischmanni. Meza-Parral y colaboradores (2010) obtienen un nuevo registro para el estado de Nerodia rhombifer wetrleri; Luria-Manzano et al (2010) registran a Gastrophryne usta para el estado y Chavez-Ortiz et al. (2010) amplían el área de distribución de Eleutherodactylus leprus en el estado.
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Papers by Manuel Ernesto Vargas Orrego