Browsing by Author "Figueroa, J."

Now showing 1 - 7 of 7
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    Contribuciones del lenguaje al aprendizaje en ciencias de estudiantes de 4º grado
    (CIIPME, 2022) Meneses, Alejandra; Montenegro, M.; Acevedo, D.; Hugo, E.; Figueroa, J.
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    First characterization of the gut microbiome associated with Mytilus chilensis collected at a mussel farm and from a natural environment in Chile
    (2022) Santibanez, P.; Romalde, J.; Maldonado, J.; Fuentes, D.; Figueroa, J.
    The gut microbiome of Mytilus chilensis was analyzed using a next-generation sequencing (NGS) approach using as target the V6-V8 16S rDNA gene regions. The resident gut bacterial communities were analyzed in individuals collected from two locations, both free-living in natural conditions (Wild Type group, WT) and those found in intensive commercial cultures at a Mussel Farm (MF group) off the Chilean coast. A total of 1.2 M of nonchimeric sequences were detected, belonging to 30 phyla, including Fusobacteria, Proteobacteria, Bacteroides, Tenericutes, and 404 genera taxa. The major fraction of the sequences detected corresponded to Vibrionaceae and Fusobacteriaceae families for MF and WT groups, respectively. The gut microbiome of M. chilensis showed a wide diversity of microorganisms; however, differences were observed depending on the origin of samples, where gut samples from the mussel farm showed a lower number of genera when compared to gut tissue samples collected from the wild type individuals. The dominant bacterial are Vibrio, Psychrilyobacter, Mycoplasma, and Psychromonas, that were present with different relative abundancies among the samples analyzed. This next generation sequencing technique, applied for the first time in Chilean mussel (M. chilensis), showed that the gut is a useful tissue for the study of bacterial communities in this bivalve mollusk. The results obtained in this work provided insights into the composition of the microbiota of M. chilensis, unravelling the great bacterial diversity and the effect of habitat on the bacterial community structure.
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    Mechanical performance of amorphous diamond-like carbon nanowires
    (2024) Roco, Fiorella R.; Clark, J.; Allende, S.; Soto, W.; Amigo, N.; Figueroa, J.; Bringa, Eduardo M.; Valencia, Felipe J.
    Amorphous carbon nanowires (NW) are a fundamental piece in the study of novel nanoarchitectures with unexpected mechanical properties. However, the failure mechanism of amorphous carbon NW is still missing. In this study, classical molecular dynamics was employed to conduct stress-strain tests to address the mechanical response of amorphous carbons NW with different radii. This research characterizes the mechanical properties of aC NW with different sp(3) contents, including Youngs modulus and ultimate tensile stress. Our study reveals that plastic deformation is mediated by chemical modifications in carbon bonding, leading to transitions from sp(2) to sp(3) and vice versa. We observed that denser amorphous carbon materials undergo a transition from sp(3) to sp(2) bonding prior to failure, facilitated by the recombination of sp(2) clusters. Additionally, plastic deformation in amorphous carbon NW is facilitated by the formation of shear transformation zones and nanovoids, with the deformation mechanism strongly dependent on the average coordination of carbon atoms. These insights provide valuable information for designing nanomaterials with tailored mechanical properties.
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    Mixed beta regression : a Bayesian perspective
    (2013) Figueroa, J.; Arellano Valle, Reinaldo Boris; Ferrari, S.
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    Multicentric study of cervical cancer screening with human papillomavirus testing and assessment of triage methods in Latin America : The ESTAMPA screening study protocol
    (2020) Almonte, M.; Murillo, R.; Sánchez, G. I.; González, P.; Ferrera, A.; Picconi, M. A.; Wiesner, C.; Cruz Valdez, A.; Lazcano Ponce, E.; Ferreccio Readi, Catterina; Jerónimo, J.; Kasamatsu, E.; Mendoza, L.; Rodríguez, G.; Calderón, A.; Venegas, G.; Villagra, V.; Tatti, S.; Fleider, L.; Terán, C.; Baena, A.; Hernández, M. D. L. L.; Rol, M. L.; Lucas, E.; Barbier, S.; Ramírez, A. T.; Arrossi, S.; Rodríguez, M. I.; González, E.; Celis, M.; Martínez, S.; Salgado, Y.; Ortega, M.; Beracochea, A. V.; Pérez, N.; Rodríguez De La Peña, M.; Ramón, M.; Hernández Nevarez, P.; Arboleda Naranjo, M.; Cabrera, Y.; Salgado, B.; García, L.; Retana, M. A.; Colucci, M. C.; Arias Stella, J.; Bellido Fuentes, Y.; Bobadilla, M. L.; Olmedo, G.; Brito García, I.; Méndez Herrera, A.; Cardinal, L.; Flores, B.; Peñaranda, J.; Martínez Better, J.; Soilán, A.; Figueroa, J.; Caserta, B.; Sosa, C.; Moreno, A.; Mural, J.; Doimi, F.; Giménez, D.; Rodríguez, H.; Lora, O.; Luciani, S.; Broutet, N.; Darragh, T.; Herrero, R.