"Trenes de paso hacia ningún lugar" : sobre La vida de frontera de Carlos Marzal

La vida de frontera, publicado en 1991, es el segundo libro del poeta español Carlos Marzal (Valencia, 1961). Todo el poemario es, en primera y última instancia, una íntima y honda reflexión sobre la existencia, sus límites -sus "fronteras"-, su sentido o mejor, su falta de sentido. El pensamiento poético de Marzal responde en este libro a una orientación claramente borgiana que incluye la meditación sobre la reversibilidad del tiempo y del espacio, la fusión entre sueño y vigilia, la contigüidad vertiginosa del Aleph que intenta desbaratar la inevitable sucesividad del tiempo humano, la indagación metapoética a través del tópico de la rosa, la cita de Schopenhauer que introduce el sobresalto metafísico del conflicto entre libre albedrío y predestinación, la pública declaración de amor a las bibliotecas, la fe en el azar, el balance existencial del Borges de "El remordimiento" espejado notablemente en "Acto de contrición". Las conclusiones apuntan a subrayar el carácter de tránsito que el texto exhibe desde su arranque experiencial (propio de la escritura de los '80) hacia una poética que podríamos denominar "del pensamiento."

Clusters and Innovation: Beijing's Hi-technology Industry Cluster and Guangzhou's Automobile Industry Cluster

This paper proposes a flowchart approach to the automobile industry cluster policy and the hi-technology industry cluster policy to prioritize policy measures. First, in the automobile industry cluster, suppliers of parts and components to anchor firms such as Honda, Nissan and Toyota of Japanese assembly makers in Guangzhou, China, can innovate partly because the suppliers have become independent of their anchor firms in the Japanese Keiretsu system. Second, concerning the hi-technology industry clustering in Beijing, we show that the existence of universities is a precondition for the industrial cluster policy and that the leadership of the Zhongguancun Science Park Management Committee of Beijing Municipality is crucial to the success of the industrial cluster policy. The flowchart for the hi-technology industry is different from the one for the automobile industry cluster.

The Flowchart Model of Cluster Policy: The Automobile Industry Cluster in China

This paper proposes a general model of the flowchart approach to industrial cluster policy and applies this model to Guangzhou's automobile industry cluster. The flowchart approach to industrial cluster policy is an action plan for prioritizing policy measures in a time-ordered series. We reached the following two conclusions. First,we clarified the effects of Honda, Nissan, and Toyota on agglomeration in Guangzhou's automobile industry cluster. Second, we established that local governments play a crucial role in successful industrial cluster policy, and that the mayor of the local government should be offered incentives in order to target industrial clustering and implement cluster policy.

Perfecting the Catching-up: The Case of Taiwan's Motorcycle Industry

The final stage of the catching-up process has formidable hurdles. This paper examines the case of Taiwan’s motorcycle industry and shows how latecomers overcame the hurdles. In the early 1990s, the two largest motorcycle makers in Taiwan, Sanyang and Kwang Yang, had completed the catching-up process and became independent from Honda, on which they had technologically depended since the early 1960s. The requisite for independence was acquiring the capacity for product innovation. The two assemblers could cultivate technological capacity by investing abundant resources, which they accumulated in the protected market. It should be noted that although the market was protected and highly concentrated, it was also very competitive. Another condition was the solid local suppliers of parts and components. The local suppliers had also grown under the government’s industrial policies. However, their development beyond imitators can be attributed to their own initiatives.

The effect of EU environmental regulation on international trade : restriction of hazardous substance as a trade barrier

In 2003 the Restriction of Hazardous Substances (RoHS) was established in the EU, which limited the trade of machinery, electrical and electronic equipment that have at least one of the substances considered hazardous under RoHS directive. Since countries trading with the EU must comply with this new regulation, it is expected a decrease in value of imports to the EU. In this paper, it is followed the procedures used in Heckman (1979), as well as the extended procedure suggested by Helpman, Melitz, and Rubinstein (2008) to ascertain the effects on the persistence of trade and values of trade.

Effects of RoHs and REACH regulations on firm-level production and export, and the role of global value chains : the cases of Malaysia and Vietnam

This paper uses firm-level data to examine the impact of foreign chemical safety regulations such as RoHS and REACH on the production costs and export performance of firms in Malaysia and Vietnam. This paper also investigates the role of global value chains in enhancing the likelihood that a firm complies with RoHS and REACH. We find that in addition to the initial setup costs for compliance, EU RoHS (REACH) implementation imposes on firms additional variable production costs by requiring additional labor and capital expenditures of around 57% (73%) of variable costs. We also find that compliance with RoHS and REACH significantly increases the probability of export and that compliance with EU RoHS and REACH helps firms enter a greater variety of countries. Furthermore, firms participating in global value chains have higher compliance with RoHS and REACH regulations, regardless of whether the firm is directly exporting, when the firm operates in upstream or downstream industries of the countries' supply chain.

La acción académica posterior al abandono. Elemento necesario para un Sistema Nacional de registro de información sobre el abandono

En torno al problema del abandono se han difundido opiniones y datos que han generado una honda preocupación social y ante la cual no existe, por lo general una intervención planificada para solucionarlo.Las Instituciones de Educación Superior(IES), por si solas, encuentran grandes dificultades para poder diagnosticar adecuadamente el problema de la deserción estudiantil, y abordar con éxito, el problema del abandono de sus estudiantes. Para poder afrontarlo no es suficiente tener control y poder actuar sobre el contexto en el cual se produce el abandono, es decir las instituciones de educación superior, sino que se hace necesario vincularlo con la situación previa y especialmente con la situación posterior del estudiante que abandona. Esto no es posible sin la cooperación de Organismos superiores, de carácter regional y nacional,que entre otros objetivos, faciliten soporte a través de un Sistema de Registro de Información en el marco de un Modelo Nacional de caracterización del abandono e intervención en la educación superior. El Proyecto ALFA-GUIA, viene trabajando en diferentes ámbitos para tener una visión integral del problema del abandono y detectar aquellos elementos que están suponiendo un obstáculo para mejorar la eficiencia en los esfuerzos que muchos organismos e instituciones realizan para reducir el abandono. Particularmente se han puesto de manifiesto la imprecisión y/o falta de comparabilidad con la que se describe el alcance del abandono, la escasa identificación de los diferentes tipos de abandono y especialmente la falta de un establecimiento de categorías relacionadas con la acción académica posterior del estudiante que ha abandonado, o la conveniencia de un modelo predictivo y de unos procedimientos vinculados a los sistemas de garantía de calidad. En este artículos se abordan estos temas, poniendo especial énfasis en el interés por analizar profundamente la relación del problema del abandono con las acciones académicas posteriores que realiza el estudiante que ha abandonado. La preocupación e interés social y las consecuencias personales y colectivas del abandono son diferentes si el alumno continúa otros estudios similares o si de desliga totalmente del sistema educativo, así como situaciones intermedias cuyo impacto personal y social es muy distinto. Algunos estudios también han relacionado los factores determinantes del abandono con la acción académica posterior del estudiante que abandona. Ambas razones llevan a la reflexión de que un mejor conocimiento de esta variable es determinante para una gestión integral del problema. Se proponen ciertas variables que caracterizan la acción académica posterior al abandono, tales como nivel, ámbito, institución y tiempo.

Retardation of skeletal development and cervical abnormalities in transgenic mice expressing a dominant-negative retinoic acid receptor in chondrogenic cells

Skeletal formation is a fundamental element of body patterning and is strictly regulated both temporally and spatially by a variety of molecules. Among these, retinoic acid (RA) has been shown to be involved in normal skeletal development. However, its pleiotropic effects have caused difficulty in identifying its crucial target cells and molecular mechanisms for each effect. Development of cartilage primordia is an important process in defining the skeletal structures. To address the role of RA in skeletal formation, we have generated mice expressing a dominant-negative retinoic acid receptor (RAR) in chondrogenic cells by using the type II collagen α1 promoter, and we have analyzed their phenotypes. These mice exhibited small cartilage primordia during development and retarded skeletal formation in both embryonic and postnatal periods. They also showed selective degeneration in their cervical vertebrae combined with homeotic transformations, but not in their extremities. The cervical phenotypes are reminiscent of phenotypes involving homeobox genes. We found that the expression of Hoxa-4 was indeed reduced in the cartilage primordia of cervical vertebrae of embryonic day 12.5 embryos. These observations demonstrate that endogenous RA acts directly on chondrogenic cells to promote skeletal growth in both embryonic and growing periods, and it regulates the proper formation of cervical vertebrae. Furthermore, RA apparently specifies the identities of the cervical vertebrae through the regulation of homeobox genes in the chondrogenic cells. Great similarities of the phenotypes between our mice and reported RAR knockout mice revealed that chondrogenic cells are a principal RA target during complex cascades of skeletal development.

BAS1: A gene regulating brassinosteroid levels and light responsiveness in Arabidopsis

The Arabidopsis bas1-D mutation suppresses the long hypocotyl phenotype caused by mutations in the photoreceptor phytochrome B (phyB). The adult phenotype of bas1-D phyB-4 double mutants mimics that of brassinosteroid biosynthetic and response mutants. bas1-D phyB-4 has reduced levels of brassinosteroids and accumulates 26-hydroxybrassinolide in feeding experiments. The basis for the mutant phenotype is the enhanced expression of a cytochrome P450 (CYP72B1). bas1-D suppresses a phyB-null allele, but not a phyA-null mutation, and partially suppresses a cryptochrome-null mutation. Seedlings with reduced BAS1 expression are hyperresponsive to brassinosteroids in a light-dependent manner and display reduced sensitivity to light under a variety of conditions. Thus, BAS1 represents one of the control points between multiple photoreceptor systems and brassinosteroid signal transduction.

Spatiotemporal dynamics of guanosine 3′,5′-cyclic monophosphate revealed by a genetically encoded, fluorescent indicator

To investigate the dynamics of guanosine 3′,5′-cyclic monophosphate (cGMP) in single living cells, we constructed genetically encoded, fluorescent cGMP indicators by bracketing cGMP-dependent protein kinase (cGPK), minus residues 1–77, between cyan and yellow mutants of green fluorescent protein. cGMP decreased fluorescence resonance energy transfer (FRET) and increased the ratio of cyan to yellow emissions by up to 1.5-fold with apparent dissociation constants of ≈2 μM and >100:1 selectivity for cGMP over cAMP. To eliminate constitutive kinase activity, Thr516 of cGPK was mutated to Ala. Emission ratio imaging of the indicators transfected into rat fetal lung fibroblast (RFL)-6 showed cGMP transients resulting from activation of soluble and particulate guanylyl cyclase, respectively, by nitric oxide (NO) and C-type natriuretic peptide (CNP). Whereas all naive cells tested responded to CNP, only 68% responded to NO. Both sets of signals showed large and variable (0.5–4 min) latencies. The phosphodiesterase (PDE) inhibitor 3-isobutyl-1-methylxanthine (IBMX) did not elevate cGMP on its own but consistently amplified responses to NO or CNP, suggesting that basal activity of guanylate cyclase is very low and emphasizing the importance of PDEs in cGMP recycling. A fraction of RFL cells showed slowly propagating tides of cGMP spreading across the cell in response to delocalized application of NO. Biolistically transfected Purkinje neurons showed cGMP responses to parallel fiber activity and NO donors, confirming that single-cell increases in cGMP occur under conditions appropriate to cause synaptic plasticity.

Decreased GA1 Content Caused by the Overexpression of OSH1 Is Accompanied by Suppression of GA 20-Oxidase Gene Expression

We previously reported that overexpression of the rice homeobox gene OSH1 led to altered morphology and hormone levels in transgenic tobacco (Nicotiana tabacum L.) plants. Among the hormones whose levels were changed, GA1 was dramatically reduced. Here we report the results of our analysis on the regulatory mechanism(s) of OSH1 on GA metabolism. GA53 and GA20, precursors of GA1, were applied separately to transgenic tobacco plants exhibiting severely changed morphology due to overexpression of OSH1. Only treatment with the end product of GA 20-oxidase, GA20, resulted in a striking promotion of stem elongation in transgenic tobacco plants. The internal GA1 and GA20 contents in OSH1-transformed tobacco were dramatically reduced compared with those of wild-type plants, whereas the level of GA19, a mid-product of GA 20-oxidase, was 25% of the wild-type level. We have isolated a cDNA encoding a putative tobacco GA 20-oxidase, which is mainly expressed in vegetative stem tissue. RNA-blot analysis revealed that GA 20-oxidase gene expression was suppressed in stem tissue of OSH1-transformed tobacco plants. Based on these results, we conclude that overexpression of OSH1 causes a reduction of the level of GA1 by suppressing GA 20-oxidase expression.

Involvement of specific macrophage-lineage cells surrounding arterioles in barrier and scavenger function in brain cortex.

The transport of solutes between blood and brain is regulated by a specific barrier. Capillary endothelial cells of brain are known to mediate barrier function and facilitate transport. Here we report that specific cells surrounding arterioles, known as Mato's fluorescent granular perithelial (FGP) cells or perivascular microglial cells, contribute to the barrier function. Immunohistochemical and in situ hybridization studies indicate that, in normal brain cortex, type I and type II macrophage scavenger receptors are expressed only in FGP/perivascular microglial cells, and surface markers of macrophage lineage are also detected on them. These cells mediate the uptake of macromolecules, including modified low density lipoprotein, horseradish peroxidase, and ferritin injected either into the blood or into the cerebral ventricles. Accumulation of scavenged materials with aging or after the administration of a high-fat diet results in the formation of honeycomb-like foam cells and the narrowing of the lumen of arterioles in the brain cortex. These results indicate involvement of FGP/perivascular microglial cells in the barrier and scavenger functions in the central nervous system.