Browsing Química by Author "Libby Hernández, Eduardo"
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Light Reflection by Cuticles of Chrysina Jewel Scarabs: Optical Measurements, Morphology Characterization, and Theoretical Modeling
Vargas Castro, William E.; Hernández Jiménez, Marcela; Libby Hernández, Eduardo; Azofeifa Alvarado, Daniel E.; Barboza Aguilar, Cinthya; Solís Blanco, Ángel Arturo (2016)Cuticles of some Chrysina scarabs are characterized by flat, graded, and twisted structures of nanosized chitin fibrils. As inferred from SEM images, each species has its own spatial period or pitch P which is dependent ... -
Microbial Community Structure Alogn a Horizontal Oxygen Gradient in a Costa Rican Volcanic Influeced Acid Rock Drainage System
Arce Rodríguez, Alejandro; Puente Sánchez, Fernando; Avendaño Vega, Roberto; Libby Hernández, Eduardo; Mora Amador, Raúl Alberto; Rojas Jiménez, Keilor; Martínez Cruz, María; Pieper, Dietmar H.; Chavarría Vargas, Max (2020-06-22)We describe the geochemistry and microbial diversity of a pristine environment that resembles an acid rock drainage (ARD) but it is actually the result of hydrothermal and volcanic influences. We designate this environment, ... -
Pristine but metal-rich Río Sucio (Dirty River) is dominated by Gallionella and other iron-sulfur oxidizing microbes
Arce Rodríguez, Alejandro; Puente Sánchez, Fernando; Avendaño Vega, Roberto; Libby Hernández, Eduardo; Rojas Sánchez, Leonardo; Cambronero Heinrichs, Juan Carlos; Pieper, Dietmar H.; Timmis, Kenneth N.; Chavarría Vargas, Max (2017-03)Whether the extreme conditions of acidity and heavy metal pollution of streams and rivers originating in pyritic formations are caused primarily by mining activities or by natural activities of metal-oxidizing microbes ... -
Rapid shift in microbial community structure in a neutral hydrothermal hot spring from Costa Rica
Rojas Gätjens, Diego; Arce Rodríguez, Alejandro; Puente Sánchez, Fernando; Avendaño Vega, Roberto; Libby Hernández, Eduardo; Conejo Barboza, Geraldine; Mora Amador, Raúl Alberto; Rojas Jiménez, Keilor Osvaldo; Pieper, Dietmar H.; Chavarría Vargas, Max (2020)In this work, we characterize the geochemistry and microbial community of Bajo las Peñas, a neutral (pH 6.5-7.4), hot spring (T = 62.0-68.0°C) located near Turrialba Volcano, Costa Rica. The microbiota at its two sources ...