Search results for "Root"
showing 10 items of 1237 documents
Fungal genes related to calcium homeostasis and signalling are upregulated in symbiotic arbuscular mycorrhiza interactions
2012
Fluctuations in intracellular calcium levels generate signalling events and regulate different cellular processes. Whilst the implication of Ca2+ in plant responses during arbuscular mycorrhiza (AM) interactions is well documented, nothing is known about the regulation or role of this secondary messenger in the fungal symbiont. The spatio-temporal expression pattern of putatively Ca2+-related genes of Glomus intraradices BEG141 encoding five proteins involved in membrane transport and one nuclear protein kinase, was investigated during the AM symbiosis. Expression profiles related to successful colonization of host roots were observed in interactions of G. intraradices with roots of wild-ty…
DIDÁCTICA DE LAS ARTES CON TIC, APRENDIZAJE COLABORATIVO E INTERDISCIPLINARIEDAD EN LA FORMACIÓN INICIAL DEL PROFESORADO
2021
El aprendizaje mediante las tecnologías de la información y comunicación y la interdisciplinariedad como ejes de la innovación pedagógica son aspectos que se deben fomentar en la Educación Superior desde la declaración de Bolonia, hace ya veinte años. Sin embargo, todavía no han arraigado lo suficiente en muchas aulas universitarias. Es por ello que se presenta un estudio sobre una experiencia educativa desarrollada por profesorado de las áreas de didáctica de la expresión musical, plástica y corporal con futuros docentes en formación. Los objetivos son promover el uso de las TIC, nuevos sistemas de comunicación de los trabajos académicos y el aprendizaje colaborativo e interdisciplinar ent…
Histopathological progression of hidradenitis suppurativa/acne inversa
2021
It is generally acknowledged that the first morphological change of hidradenitis suppurativa/acne inversa (HS/AI) consists of infundibular plugging of the folliculosebaceous apocrine apparatus, which is followed by acute and chronic inflammation, cysts with sinus formation, and fibrosis. Alternatively, it has been hypothesized that HS/AI is primarily a neutrophilic autoinflammatory disease and that the follicular plugging typical of this disease is secondary to inflammation.To review the sequence of the changes that mark the disease development, we have performed a histopathologic study on the surgical material from a series of axillary and inguinal/perineal cases.The histologic material fr…
New Evidence of the Real Interest Rate Parity for OECD Countries Using Panel Unit Root Tests with Breaks
2006
This paper tests for real interest parity (RIRP) among the nineteen major OECD countries over the period 1978:Q2-1998:Q4. The econometric methods applied consist of combining the use of several unit root or stationarity tests designed for panels valid under cross-section dependence and presence of multiple structural breaks. Our results strongly support the fulfillment of the weak version of the RIRP for the studied period once dependence and structural breaks are accounted for.
Grassroots Social Innovation for Human Development: An Analysis of Alternative Food Networks in the City of Valencia (Spain)
2017
This paper explores the contribution the capability approach (CA) and grassroots innovation (GI) literature makes to a better understanding of the complexity, richness and specificity of bottom-up processes of social innovation (SI), and their specific contribution to social transformation. Using a purely qualitative methodology, the paper addresses a case study—organic food buying groups in the city of Valencia—and examines them through the lenses of SI, GI and CA. By taking four concurrent dimensions of the SI literature (agents, purposes, drivers and processes) and cross-fertilising them with the bottom-up, people-driven character of GI, and the concepts of agency, capabilities, delibera…
Is the environmental performance of industrialized countries converging? A ‘SURE’ approach to testing for convergence
2008
In this paper, we test for convergence in the environmental performance of a sample of OECD countries, with data ranging from 1971 to 2002. First, we use Data Envelopment Analysis (DEA) to compute two environmental performance indicators (EPIs) in the production theory framework. Second, we propose the use of a sequential multivariate approach to test for convergence in environmental performance. These tests allow us to reconcile the time series literature with the cross-sectional dimension, which is basic when testing for convergence in regional blocs. The SURE technique is used, which allows for the existence of correlations across the series without imposing a common speed of mean revers…
Hysteresis vs. natural rate of unemployment: new evidence for OECD countries
2004
Abstract The paper tests hysteresis effects in unemployment using panel data for 19 OECD countries. We apply a sequential procedure based in two multivariate augmented Dickey-Fuller test (ADF)-type panel unit root tests in a SURE framework. We strongly reject the joint null of hysteresis and find that only seven countries present evidence of hysteresis.
Testing the stationarity of interest rates using a SUR approach
1998
Abstract Using data on average yields to maturity of German bonds with different time to maturity it is shown that the time series contain a unit root if the standard augmented Dickey–Fuller test is applied separately to each series. To improve the power of the test we carried out a recently developed approach, estimating the regressions for each time to maturity jointly using a seemingly unrelated regressions approach.
50 years of capital mobility in the eurozone: breaking the Feldstein-Horioka puzzle
2021
AbstractThis paper assesses capital mobility for the Eurozone countries by studying the long-run relationship between domestic investment and savings for the period 1970-2019. Our main goal is to analyze the impact of economic events on capital mobility during this period. We apply the cointegration methodology in a setting that allows us to identify endogenous breaks in the long-run saving-investment relationship. Precisely, the breaks coincide with relevant economic events. We find a downward trend in the saving-investment retention since the 70s for the so-called “core countries”, whereas this trend is not so evident in the peripheral, where the financial and sovereign crises have had a …
TESTING FOR REAL INTEREST RATE PARITY USING PANEL STATIONARITY TESTS WITH DEPENDENCE: A NOTE*
2009
In this paper we test for real interest parity (RIRP) among the 19 major OECD countries over the period 1978:Q1–2006:Q1 using both short- and long-run definitions of interest rates. Once the independence hypothesis is rejected among these series, we test for RIRP using panel data unit root and stationarity tests based on common factor models that allow for pervasive forms of dependence. Our results indicate that there is no evidence in favor of the weak version of the RIRP since one of the common factors that have been estimated is non-stationary.