Person: García Olaverri, Carmen
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García Olaverri
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Carmen
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Estadística e Investigación Operativa
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0000-0003-4910-0822
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311
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Publication Open Access Depletion of the heaviest stable N isotope is associated with NH4+/NH3 toxicity in NH4+-fed plants(BioMed Central, 2011) Ariz, Idoia; Cruz, Cristina; Morán Juez, José Fernando; González Moro, María Begoña; García Olaverri, Carmen; González Murua, Carmen; Martins Loucao, María A.; Aparicio Tejo, Pedro María; Estatistika eta Ikerketa Operatiboa; Estadística e Investigación Operativa; IdAB. Instituto de Agrobiotecnología / Agrobioteknologiako InstitutuaBackground: In plants, nitrate (NO3-) nutrition gives rise to a natural N isotopic signature (δ15N), which correlates with the δ15N of the N source. However, little is known about the relationship between the δ15N of the N source and the 14N/15N fractionation in plants under ammonium (NH4+) nutrition. When NH4 + is the major N source, the two forms, NH4 + and NH3, are present in the nutrient solution. There is a 1.025 thermodynamic isotope effect between NH3 (g) and NH4 + (aq) which drives to a different δ15N. Nine plant species with different NH4 +-sensitivities were cultured hydroponically with NO3 - or NH4 + as the sole N sources, and plant growth and δ15N were determined. Short-term NH4 +/NH3 uptake experiments at pH 6.0 and 9.0 (which favours NH3 form) were carried out in order to support and substantiate our hypothesis. N source fractionation throughout the whole plant was interpreted on the basis of the relative transport of NH4 + and NH3. Results: Several NO3 --fed plants were consistently enriched in 15N, whereas plants under NH4 + nutrition were depleted of 15N. It was shown that more sensitive plants to NH4 + toxicity were the most depleted in 15N. In parallel, N-deficient pea and spinach plants fed with 15NH4 + showed an increased level of NH3 uptake at alkaline pH that was related to the 15N depletion of the plant. Tolerant to NH4 + pea plants or sensitive spinach plants showed similar trend on 15N depletion while slight differences in the time kinetics were observed during the initial stages. The use of RbNO3 as control discarded that the differences observed arise from pH detrimental effects. Conclusions: This article proposes that the negative values of δ15N in NH4 +-fed plants are originated from NH3 uptake by plants. Moreover, this depletion of the heavier N isotope is proportional to the NH4 +/NH3 toxicity in plants species. Therefore, we hypothesise that the low affinity transport system for NH4 + may have two components: one that transports N in the molecular form and is associated with fractionation and another that transports N in the ionic form and is not associated with fractionation.Publication Open Access El tamaño de las empresas y la calidad del recurso empresarial: ¿causa o efecto?(Gobierno Vasco, 2016) Huerta Arribas, Emilio; García Olaverri, Carmen; Garcés Galdeano, Lucía; Gestión de Empresas; Enpresen Kudeaketa; Estadística, Informática y Matemáticas; Estatistika, Informatika eta MatematikaEste artículo explora las posibles causas de la heterogeneidad observada en la productividad de las empresas españolas, buscando un vínculo entre la calidad de gestión y el tamaño empresarial en el contexto de las empresas españolas. Los resultados indican que existe una relación positiva entre la calidad y el tamaño empresarial. Esta calidad empresarial, medida a través de diferentes indicadores (nivel educativo, competencias y capacidades profesionales así como el nivel de implantación de prácticas avanzadas de gestión), está relacionada con la gestión de la empresa y con la orientación estratégica de la misma, que juntas influyen también sobre su tamaño. Por lo tanto, la mejora de la gestión empresarial, avanzando hacia el profesionalismo, permitirá a las empresas diseñar las estrategias y estructuras internas necesarias para facilitar su adaptación al entorno empresarial y lograr así mejores resultados.Publication Open Access The hidden value of intangibles: do CEO characteristics matter?(Emerald, 2019) Garcés Galdeano, Lucía; García Olaverri, Carmen; Enpresen Kudeaketa; Estatistika, Informatika eta Matematika; Institute for Advanced Research in Business and Economics - INARBE; Gestión de Empresas; Estadística, Informática y MatemáticasPurpose: A great deal of research has examined the relationship between a single CEO attribute and a single measure of firm performance; no attempts have been made to integrate them to create a more global vision of both. Therefore, trying to answer new calls from Wang et al. (2016) or Liu, Fisher and Chen (2018) about a more global vision of the CEO characteristics, the authors are going to take a step forward to combine different CEO characteristics with different firm performance measure in order to show that a certain managerial profile would have an impact on several variables of firm performance. This paper aims to discuss these issues. Design/methodology/approach: Using a sample of 1,236 small firms in high- and medium-high-technology sectors and through the Canonical Correlation Analysis, the authors are able to create different CEO’s profiles that influence on different combinations of firm performance variables. Findings: The authors obtain different CEO’s profiles that influence on different combinations of firm performance variables. Each CEO profile will enhance or diminish one kind of performance measure. The authors found that on the one hand, young, well-educated with external experience CEO profile will enhance innovative performance and firm growth, and on the other hand, old and more internal and external experience CEO profile will enhance the exploitation of external knowledge. Originality/value: Through this analysis, the authors will be able to provide a more comprehensive analysis of the predictions about the role of CEOs in small firms.Publication Open Access Leaf δ15N as a physiological indicator of the responsiveness of N2-fixing alfalfa plants to elevated CO2, temperature and low water availability(Frontiers Media, 2015) Ariz, Idoia; Cruz, Cristina; Neves, Tomé; Irigoyen, Juan J.; García Olaverri, Carmen; Nogués, Salvador; Aparicio Tejo, Pedro María; Aranjuelo Michelena, Iker; Estatistika eta Ikerketa Operatiboa; Natura Ingurunearen Zientziak; Estadística e Investigación Operativa; Ciencias del Medio Natural; IdAB. Instituto de Agrobiotecnología / Agrobioteknologiako Institutua; Gobierno de Navarra / Nafarroako GobernuaThe natural 15N/14N isotope composition (δ15N) of a tissue is a consequence of its N source and N physiological mechanisms in response to the environment. It could potentially be used as a tracer of N metabolism in plants under changing environmental conditions, where primary N metabolism may be complex, and losses and gains of N fluctuate over time. In order to test the utility of δ15N as an indicator of plant N status in N2-fixing plants grown under various environmental conditions, alfalfa (Medicago sativa L.) plants were subjected to distinct conditions of [CO2] (400 vs. 700 μmol mol−1), temperature (ambient vs. ambient +4°C) and water availability (fully watered vs. water deficiency—WD). As expected, increased [CO2] and temperature stimulated photosynthetic rates and plant growth, whereas these parameters were negatively affected by WD. The determination of δ15N in leaves, stems, roots, and nodules showed that leaves were the most representative organs of the plant response to increased [CO2] and WD. Depletion of heavier N isotopes in plants grown under higher [CO2] and WD conditions reflected decreased transpiration rates, but could also be related to a higher N demand in leaves, as suggested by the decreased leaf N and total soluble protein (TSP) contents detected at 700 μmol mol−1 [CO2] and WD conditions. In summary, leaf δ15N provides relevant information integrating parameters which condition plant responsiveness (e.g., photosynthesis, TSP, N demand, and water transpiration) to environmental conditions.Publication Open Access How important is family involvement for small companies’ growth?(Emerald, 2020) Garcés Galdeano, Lucía; García Olaverri, Carmen; Enpresen Kudeaketa; Estatistika, Informatika eta Matematika; Institute for Advanced Research in Business and Economics - INARBE; Gestión de Empresas; Estadística, Informática y MatemáticasPurpose: Our paper seeks to further understand how family involvement in management influences firm growth. Design/methodology/approach: Using a sample of small high-tech firms, we classify three different types of firms: family firms managed by family-CEOs, family firms managed by non-family CEOs and non-family firms. Findings: Consistent with our expectations, we show that firms managed by family-CEOs have less firm growth in comparison with the other two groups. When the family firm is managed by non-family CEOs, the presence of another family member in management positions has a negative impact on firm growth. Finally, we found that founder-led family firms have better firm growth than descendant-led family firms. Research limitations/implications: Implications for the theory of family firms are discussed. Originality/value: The value of the present study is to analyse in depth the heterogeneity of the family business trying to close the gap by exploring the effect of family involvement on small firm growth. Thus, we will find different behaviours of these family companies, depending on the family member’s presence in management positions.Publication Open Access Intensidade tecnológica e sistemas de trabalho de alto desempenho(Fundaçao Getulio Vargas, 2004) García Olaverri, Carmen; Larraza Kintana, Martín; Urtasun Alonso, Ainhoa; Gestión de Empresas; Enpresen Kudeaketa; Estadística e Investigación Operativa; Estatistika eta Ikerketa OperatiboaThe paper examines the moderating effect that the technological intensity of the environment in which the firm operates exerts in the High Performance Work Systems (HPWS) - firm's operational performance relationship. We study this potential moderating effect in a sample of 593 Spanish manufacturing firms divided in two sub-samples of high (n1=301) and low (n2=292) technology firms. The results show that HPWS (positively) influence firm operational performance in the case of high-tech firms, while no effect is observed for low-tech firms.