Browsing by Author "Zamora, Pablo"

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    An exploratory study of Chilean early childhood teachers' professional learning communities
    (2024) Guerra, Paula; Figueroa-Cespedes, Ignacio; Zamora, Pablo; Gonzalez, Maria Paz
    Researchshows that Professional Learning Communities (PLCs) foster teachers'professional learning. However, there is little knowledge about theirimplementation among early childhood (EC) teachers in Chilean andLatin American contexts. This article seeks to characterize two PLCscomposed of EC teachers and to analyse, from the participants'perspectives, the experience as a professional learning process. Froma qualitative perspective, a multiple case study was developed. 27 ECteachers participated, 12 from PLC 1 and 15 from PLC 2. Datacollection included nonparticipant observations, interviews and focusgroups. Data were analysed by an open coding process based ongrounded theory. The results show that each PLC highlighted differentaspects related to pedagogical practice, self-care practice, trustand close relationships, and institutional validation. From theteachers' perspective, PLCs contribute to professional learning, interms of fostering complex and critical reflective practice, andcollaborative conceptual learning that promotes not only knowledgeacquisition and construction but is also empowering for teachers.Practical and investigative implications are discussed.
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    Cold storage effects on oxidative stress of cv. Red Globe table grape rachises
    (2012) Campos-Vargas, Reinaldo; Zamora, Pablo; Contreras, Rodrigo; Koehler, Hans; Zuniga, Gustavo E.; Perez-Donoso, Alonso; Defilippi, Bruno G.
    R. Campos-Vargas, P. Zamora, R. Contreras, H. Kohler, G.E. Zuniga, A. Perez-Donoso, and B.G. Defilippi. 2012. Cold storage effects on oxidative stress of Red Globe table grape rachises. Cien. Inv. Agr. 39(1): 91-104. Table grape (Vitis vinifera L.) quality includes the condition of both the berries and the rachis. In the present report, physiological parameters of Red Globe rachises from fully elongated inflorescences (RFEI) and from mature clusters were studied after storage at 0 or 20 C for different durations. To understand changes in rachis physiology as a result of changes in temperature conditions and storage time, the activities of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) were measured. In addition, hydrogen peroxide content, membrane lipoperoxidation (TBARS), total phenolic compounds and antioxidant capacity (FRAP) were assayed. TBARS was higher in mature rachises than in RFEI. This parameter remained constant throughout storage, indicating a change presumably associated with ontogeny or senescence processes. Short-term storage (0-96 11) increased SOD. CAT and APX activities in RFEI, while in mature rachises, no changes were observed in enzyme activities or in hydrogen peroxide content. Longer cold storage (25 or 53 days at 0 degrees C) of mature rachises reduced CAT activity, but SOD and APX activities did not change under these conditions. At Oh, the FRAP and total phenolic contents of mature rachises were three and 20 times higher than in immature rachises, respectively.
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    Cold storage effects on oxidative stress of red globe table grape rachises
    (2012) Campos Vargas, Reinaldo; Zamora, Pablo; Contreras Soto, Rodrigo; Köhler, Hans; Zúñiga, Gustavo E.; Pérez Donoso, Alonso Gastón; Defilippi Bruzzine, Bruno
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    Molecular characterization of the chalcone isomerase gene family in Deschampsia antarctica
    (2013) Zamora, Pablo; Pardo, Ariel; Fierro Huerta, Angélica; Prieto, Humberto; Zúñiga, Gustavo E.