De Galicia Research Articles

An Alien in the Newsroom: AI Anxiety in European and American Newspapers

The media portrayal of artificial intelligence (AI) directly impacts how audiences conceptualize this technology and, therefore, its use, development, and regulation. This study aims to measure a key aspect of this problem: the feeling of AI anxiety conveyed by news outlets that represent this technology as a sort of “alien” that is autonomous, opaque, and independent of humans. To do so, we build an AI anxiety index based on principal component analysis (PCA) and apply it to a corpus of headlines (n = 1682) about AI published before and after the launch of ChatGPT in ten newspapers: The New York Times, The Guardian, El País, Le Monde, Frankfurter Allgemeine Zeitung, San Francisco Chronicle, Manchester Evening News, La Voz de Galicia, Ouest France, and Münchner Merkur. The results show that ChatGPT not only boosted the number of AI headlines × 5.16) but also reduced positive sentiments (−26.46%) and increased negatives (58.84%). The AI anxiety index also grew (10.59%), albeit driven by regional media (61.41%), while it fell in national media (−6.82%). Finally, the discussion of the variables that compose the index reveals the opportunities and challenges faced by national and regional media in avoiding the feeling of AI anxiety.

Diversity of ecotypes of five species of ryegrass from Northwestern Spain by phenotypic traits and microsatellites

BackgroundThe Agricultural Research Centre of Mabegondo (Xunta de Galicia, A Coruña, Spain) conserves one of the most important collections of phytogenetic resources of ecotypes and natural populations of grassland species from northwestern Spain, among them populations of ryegrass (Lolium spp.), one of the most cultivated forage grasses in the world. The objective of the present study was to evaluate the diversity among commercial cultivars and natural ryegrass populations with phenotypic traits and molecular markers.ResultsEleven polymorphic microsatellites loci were used to analyze 58 ecotypes and 10 cultivars (680 DNA samples in total) differentiating 673 genotypes. Two main groups were detected by the Structure analysis, one related to Lolium perenne and a second to Lolium multiflorum. The first group showed two subgroups and the second three. The cluster of L. multiflorum showed two subgroups not related with the third cluster including commercial varieties, one from the Canary Islands (with Lolium rigidum included) and a second one from northwestern Spain, which presented specific agromorphological characteristics, such as lower FES (number of days from 1 January, when three heads per plant were flowering per plot), CRE (growth in flowering, in g of dry matter), and AIN (number of inflorescences per plant).ConclusionsThis is the first time that a large amount of data on ryegrass from the Iberian Peninsula has been analyzed, obtaining a clear genetic differentiation of the autochthonous varieties from the commercial varieties analyzed. In addition, the genetic structure found in the ecotypes was related to the phenotypic variation analyzed. Being of interest in the conservation of biodiversity and in obtaining better adapted varieties of ryegrasses, due to their specific phenotypic traits, such as a lower FES, CRE and AIN.

Comparative study of the initiation flute methods in Galicia

The initiation to the study of the transverse flute involves the acquisition of a basic technique which is learned through different methods of initiation, but: do they adjust to the technical variables of the legislative framework? What are the most significant technical parameters for the teachers of the Xunta de Galicia? The main objective of this research is to know which methodological proposal works the contents established in the regulatory framework more effectively. To do this, a methodology consisting of an analysis of the methods and the design and validation of a questionnaire for the teachers in Galician conservatories has been used. The conclusions are revealing in the sense that the teaching of flute in this Autonomous Community is carried out through three methods, and none of them fully satisfy neither the concerns of teachers nor the demands of Galician legislation.

Regional economic development in the lens of the dilemma between growth poles approach and the balanced growth theory. An observatory during the Francoist regime

Regional economic development gained increasing relevance in European policy agendas after the Second World War, especially under the implementation of indicative planning. Likewise, a lively debate arose between the growth poles approach and the balanced growth theory. The main aim of this paper is to analyse this dilemma mainly through contributions from the Revista de Economía de Galicia (Galician Economic Review), as a representative observatory of this controversial discussion in the Francoist regime. National and international contributions underlined the positive potential effects of fostering an upgrading process of traditional sectors as a way of enhancing balanced and endogenous growth.

AI Implementation Strategies in the Spanish Press Media: Organizational Dynamics, Application Flows, Uses and Future Trends

This research analyses the artificial intelligence application strategies adopted by the Spanish press media at the height of the generative AI boom, extending previous studies on integrating AI technology into journalistic routines. We studied the dynamics of implementation of AI solutions in the main newspapers in Spain, determining the departments or professionals involved, the current uses, and how AI affects their organization chart and professional profiles, as well as providing insights into the future trends of this technology in the sector. For this purpose, a qualitative methodology was employed, based on interviews with a purposive sample of executives from the 10 newspapers with the largest circulation in Spain: El País, La Vanguardia, Marca, La Voz de Galicia, As, ABC, El Mundo, El Correo, El Diario Vasco and Mundo Deportivo. The results reveal that AI is conceived in the Spanish press media as an assistant aimed at optimizing all kinds of mechanical processes and existing products, not at amplifying coverage or generating final pieces that reduce the standard of quality essential to their subscription model. Groups such as Prisa, Vocento or Unidad Editorial centralize their AI strategy, while Grupo Godó delegates this management to its headers. These newspapers consider that AI will boost the renewal of job profiles in their structures, despite the fact that they do not currently have strictly specialized professionals.

Catalysts of Change: Technological Innovations Shaping Spanish Public Proximity Media

Technological innovation is transforming local public media. New tools, applications, and platforms are allowing it to improve its reach, the quality of the content it broadcasts, and its interaction with audiences. We set out to determine the main lines of action in the technological innovations adopted by Spanish regional public service media. We conducted a qualitative study based on corporate documentary analysis and in-depth interviews with the heads of the innovation and technological support areas of the four regional corporations with the largest budgets: Corporación de Radio y Televisión de Galicia (CRTVG), Euskal Irrati Telebista-Radio (EiTB), Corporació Catalana de Mitjans Audiovisuals (CCMA), and Radio y Televisión de Andalucía (RTVA). The results showed that, without neglecting their social commitment, technological innovation was one of the main axes in the strategic plans of the organisations studied. The use of new technologies in their adaptation to the current audiovisual ecosystem represents changes in creation, distribution, and management.

Incidence and causes of hospitalization in patients with transthyretin (ATTR-CA) and light chain (AL-CA) cardiac amyloidosis

Introduction and objetivesCardiac amyloidosis (CA) is a disorder associated with high number of hospital admissions. Given the scarce information available, we propose an analysis of the incidence and causes of hospitalization in this disease. Material and methodsOne hundred and forty-three patients [128 by transthyretin (ATTR-CA) and 15 by light chains (AL-CA)] included in Registro de Amiloidosis Cardiaca de Galicia (AMIGAL) were evaluated, including all hospitalizations. ResultsDuring a median follow-up of 959 days there were 179 unscheduled hospitalizations [incidence rate (IR) 512.6 admissions per 1000 patients-year], most common due to cardiovascular reasons (n = 109, IR 312.2). Most frequent individual cause of hospitalization was heart failure (n = 87, TI 249.2).AL-CA was associated with a higher IR of unscheduled hospitalizations than ATTR-CA (IR 781 vs. 483.2; HR 1.62; p = 0.029) due to non-cardiovascular admissions (IR 376 vs. 181.2; HR 2.07; p = 0.027). Unscheduled admission-free survival at 1 and 3 years in AL-CA was inferior than in ATTR-CA (46.7% and 20.0% vs. 73.4% and 35.2%, respectively; p = 0.021). ConclusionsCA was associated with high incidence of hospitalizations, being heart failure the most frequent individual cause; unscheduled admission-free survival in AL-CA was lower than in ATTR-CA due mostly to non-cardiovascular admissions.

Abstract 4483: New drug development opportunities for PARP1

Abstract Personalized therapies allow, not only the increase of its therapeutic efficiency, but also the reduction of the secondary effects associated to the treatment of cancer. Data obtained in our group suggest that PARP1 could play a key role in the cell cycle regulation through its interaction with E2F1 transcription factor. Considering that most oncogenic processes is associated with cell cycle deregulation, the disruption of this interaction would provide a new therapeutic target of great interest and wide spectrum of indications. Therefore, our goal was to find molecules that interfere its role in cell-cycle regulation without affecting its function on DNA repair. The identification of novel compounds disrupting the PARP1/E2F1 interaction was carried out by combining in silico and in vitro screening, using a rational drug design. The virtual screen was performed using a molecular library of several million compounds at the selected target site, using AtomNet® (Atomwise), the first deep learning neural network for structure-based drug design and discovery. Since there is no complete structural information of the PARP-1/E2F1 protein-protein interaction, a homologous structure of BRCT domain of BRCA1 complex with the phospho-peptide (PDBID: 1T2V) was utilized to identify the potential binding interface of BRCT domain of PARP-1 (PDBID: 2COK) and the E2F1 protein. Top scoring compounds were clustered and filtered to arrive at a final subset of 83 compounds, library that were incorporated to our in vitro screening, which included both transcriptional (E2F1 activity) and survival studies. Twelve compounds were finally selected, based upon their higher capacity of inhibiting E2F1 activity.This work was supported by Agencia Estatal de Investigación (AEl/10.13039/501100011033), Xunta de Galicia (GPC GI-1862, ED431B 2020/26; ED431G 2019/02) and European Regional Development Fund-ERDF. AIMS Awards Program - Project A19-513, Atomwise Inc. Citation Format: Pablo Iglesias, David Moreiras, Laura Porres-Ventin, Lara Gonzalez-Rendo, Jose A. Zumalave, Victor M. Arce, Jose A. Costoya. New drug development opportunities for PARP1 [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 4483.

Abstract 5785: Shedding light on PARP1-E2F1 interaction by Cryo-EM

Abstract Cell division is orchestrated by a complex network of interactions between proteins involved in numerous signaling pathways that control cell proliferation. One of these main players is the E2F family of transcription factors. The role of these key players is to regulate the expression of several genes important in cell proliferation, particularly those involved in progression through G1 and into the S-phase of the cell cycle. In fact, cell cycle deregulation is a hallmark of cancer, and multiple studies have highlighted the critical role of E2F hyperactivation in tumor progression, angiogenesis, and metastasis. However, targeting a master regulator of cell growth will also have a pernicious effect on non-cancerous cells, thus limiting its applications. In order to overwhelm these restrictions, we propose a therapeutic approach in which E2F transcriptional activity is specifically reduced in cells with hyperactivation of the pathway, such as cancer cells.We and others have shown that poly (ADP-ribose) polymerase 1 (PARP1) is a transcriptional co-activator of E2F1 and, owing to this, loss of PARP results in cell cycle re-regulation and reduction of tumor growth. Interestingly, this effect of PARP1 does not depend on its enzymatic activity, thus opening a completely new strategic approach. Furthermore, considering that most oncogenic processes are associated with cell cycle deregulation, disruption of PARP1-E2F1 interaction could provide a new therapeutic target with a wide spectrum of indications in cancer. Currently, we lack comprehensive structural details regarding the PARP-1/E2F1 protein-protein interaction. To address this, we used cryo-EM to investigate both the standalone structure of PARP1 (full length) and its interaction with E2F1. This approach yielded high-resolution structural insights into the PARP1-E2F1 complex, enabling precise identification of the protein-protein interaction interface (PPI). Through this exploration of structural and molecular determinants governing this interaction, we aim to develop innovative strategies for designing drugs targeted at disrupting this complex. This work was supported by Agencia Estatal de Investigación (AEl/10.13039/501100011033), Xunta de Galicia (GPC GI-1862, ED431B 2020/26; ED431G 2019/02) and European Regional Development Fund-ERDF. Citation Format: Pablo Iglesias, Ester Casajus-Pelegay, Maria Moreno-Morcillo, Lara González-Rendo, Laura Porres-Ventin, Victor M. Arce, Rafael Fernandez-Leiro, Jose A. Costoya. Shedding light on PARP1-E2F1 interaction by Cryo-EM [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 5785.

Screening of Galician grapevine varieties by SNPs, phenotypic traits, and phytopathology.

The genetic erosion of the European grapevine diversity in the last century has promoted the conservation of varieties in germplasm banks to prevent their disappearance. The study of these varieties is necessary as it would allow the diversification of the wine market, as well as provide a source of genes to face new pathogens or climate constraints. In this work, the grapevine varieties preserved in the "Estación de Viticultura e Enoloxía de Galicia" (EVEGA) Germplasm Bank (Ourense, Spain) were widely characterized, combining ampelography, ampelometry, agronomy, and phytopathology. Moreover, genetic characterization was carried out through the analysis of 48 single-nucleotide polymorphisms (SNPs). A Bayesian analysis based on the SNP data was carried out to define the genetic structure of the EVEGA Germplasm Bank, which allowed the differentiation of two main reconstructed panmictic populations (RPPs), confirming previous results obtained based on microsatellite markers (SSRs). A great diversity between varieties was found for almost every parameter evaluated for ampelography, ampelometry, phytopatology, phenology, and berry quality. A principal component analysis (PCA) performed with these phenotypical data allowed discrimination among some groups of varieties included in different genetic populations. This study allowed us to evaluate the grapevine diversity maintained in the EVEGA Germplasm Bank and characterize varieties of potential value for breeding programs of interest for the Galician viticulture.

3D BIOMIMETIC CONSTRUCTS STEER STEM CELL COMMITMENT BY SYNERGISTIC MODULATION OF BIOPHYSICAL CUES AND GROWTH FACTOR SIGNALLING

Tendon diseases are prevalent health concerns for which current therapies present limited success, in part due to the intrinsically low regenerative ability of tendons. Therefore, tissue engineering presents a potential to improve this outcome. Here, we hypothesize that a concurrent control over both biophysical and biochemical stimuli will boost the tenogenic commitment of stem cells, thus promoting regeneration. To achieve this, we combine molecularly imprinted nanoparticles (MINPs), which act as artificial amplifiers for endogenous growth factor (GF) activity, with bioinspired anisotropic hydrogels2 to manufacture 3D tenogenic constructs. MINPs were solid phase-imprinted using a TGF-β3 epitope as template and their affinity for the target was assessed by SPR and dot blot. Magnetically-responsive microfibers were produced by cryosectioning electrospun meshes containing iron oxide nanoparticles. The constructs were prepared by encapsulating adipose tissue-derived stem cells (ASCs), microfibers, and MINPs within gelatin hydrogels, while aligning the microfibers with an external magnetostatic field during gelation. This allows an effective modulation of hydrogel fibrillar topography, mimicking the native tissue's anisotropic architecture. Cell responses were analyzed by multiplex immunoassay, quantitative polymerase chain reaction, and immunocytochemistry. MINPs showed an affinity for the template comparable to monoclonal antibodies. Encapsulated ASCs acquired an elongated shape and predominant orientation along the alignment direction. Cellular studies revealed that combining MINPs with aligned microfibers increased TGF-β signaling via non-canonical Akt/ERK pathways and upregulated tendon-associated gene expression, contrasting with randomly oriented gels. Immunostaining of tendon-related proteins presented analogous outcomes, corroborating our hypothesis.Our results thus demonstrate that microstructural cues and biological signals synergistically direct stem cell fate commitment, suggesting that this strategy holds potential for improving tendon healing and might be adaptable for other biological tissues. The proposed concept highlights the GF-sequestering ability of MINPs which allows a cost-effective alternative to recombinant GF supplementation, potentially decreasing the translational costs of tissue engineering strategies.Acknowledgements: The authors acknowledge the funding from the European Union's Horizon 2020 under grant No. 772817; from FCT/MCTES for scholarships PD/BD/143039/2018 & COVID/BD/153025/2022 (S.P.B.T.), and PD/BD/129403/2017 (S.M.B.), co-financed by POCH and NORTE 2020, under the Portugal 2020 partnership agreement through the European Social Fund, for contract 2020.03410.CEECIND (R.M.A.D.) and project 2022.05526.PTDC; and from Xunta de Galicia for grant ED481B2019/025 (A.P.).

Imaging the Middle Ages: Twenty-First Century Revitalizations at Santiago de Compostela

Abstract: Since the Middle Ages, Santiago de Compostela has been home to one of the most famous pilgrimage destinations in Europe. Throughout its history, its success as a pilgrimage site has most often been signaled by large-scale building projects. This essay addresses how Peter Eisenman's Cidade da Cultura de Galicia (CCG), an architectural complex and cultural center overlooking Santiago de Compostela, mediates and responds to contemporary efforts toward the production and revitalization of the pilgrim experience within the city. While not as obvious as the interventions that occur along the route, the CCG is in fact a materialization of the goals of the revitalization initiative, a vision of secularized touristic pilgrimage for the twenty-first century, which is enacted through Compostela's successful image economy. The twentieth-century revitalization efforts are peculiar for the distinctive nature of their engagement with a medieval past, and the strong connections drawn between modern pilgrimage and its medieval counterpart. This article is concerned with the material evidence of competing interests in the revitalization process and specifically with how they relate to institutional interventions initiated by the regional government. The regional government's interests were often pursued in monumental form: in the late twentieth century, the Xunta operationalized a comprehensive cultural policy that was principally enacted in architecture. Examining the CCG's own past, as well as the medieval narrative of Compostela's history that it materializes, offers a new framework for understanding the role of built space in—and its relation to—the politics of pilgrimage revitalization within the twenty-first-century context.

P10.36.B ROLE OF AMPK IN GLIOBLASTOMA BIOENERGETICS

Abstract BACKGROUND Glioblastoma is the most prevalent and aggressive primary brain tumor. AMP-activated kinase (AMPK), the main energy sensor of the cell, has been previously described by our group as a key factor in glioblastoma oncogenesis and proliferation and is known for taking part in tumoral metabolic transformation. Our group has also formerly reported how AMPK regulates the expression of lipoprotein receptors and alters lipid reliance of glioblastoma cells, suggesting AMPK orchestrates nutrient dependency and flexibility on glioblastoma. Overall, this evidence positions AMPK inhibition as a promising antitumoral therapy for glioblastoma. MATERIAL AND METHODS To further study the role of AMPK in glioblastoma bioenergetics, we used the human glioblastoma cell lines U87 and U373 and silenced AMPK by transfecting the cells with a siRNA for AMPKα1/2. To assess mitochondrial function (OCR), fuel oxidation, and glycolytic parameters (ECAR), we carried out Seahorse metabolic analyses. This technology provides non-invasive and real-time monitoring of glycolytic and mitochondrial metabolic profiles. The expression of genes related to mitochondrial energetics (CPT1C, PPARGC1A, and PPARA) in these cells was studied using RT-qPCR. We are also currently studying lactate dehydrogenase (LDH) function and expression, as well as glutamine metabolism. RESULTS Our data show that silencing of AMPKα1/2 reduces basal and maximum mitochondrial respiration, as well as decreases the expression of CPT1C, PPARGC1A, and PPARA. Altogether, these results suggest alterations in mitochondrial energetic pathways. Our results do not reveal a significant effect of AMPK on the glycolytic activity of these glioblastoma cell lines. Finally, we found a great capacity of these cells to use glucose, but also fatty acids and glutamine as energy substrates, although with a very high dependency on glucose. CONCLUSION Even though in glioblastoma cells there is an increment in aerobic glycolysis (Warburg effect), these tumoral cells still maintain an elevated mitochondrial activity and a great capacity to use lipids as a fuel. AMPK plays an important role in regulating glioblastoma mitochondrial activity and bioenergetics. The authors would like to acknowledge the Funding for the Consolidation of Competitive Groups of Research (ED431B 2020/26, Xunta de Galicia, 2020-2022).

New electronic implementation of the timestamps method intended for high resolution comparison of laser wavelengths.

This article describes a new measurement system for the comparison of two electronic signals of different frequencies with application to high resolution comparison of laser wavelengths using a Michelson interferometer. It was built within the framework of research projects made by the University of Vigo and the Laboratorio Oficial de Metroloxía de Galicia (LOMG) in cooperation with Escolas Proval High School. The new hardware is based on a cheap high-speed module for the acquisition of data and a microcontroller module for processing, which can also be used for practical lessons in vocational training. The system has been tested with electronic signal generators. The novel measurement method reduces the uncertainty using multiple consecutive measurements and the fractional part of the fringes and could achieve precisions in the range 10-12 of the wavelength ratios.

Effect of three cycles of recurrent selection for yield in four Spanish landraces of maize

Landraces of maize (Zea mays L.) have a variability not found in the elite hybrids due to the bottleneck during selection. There is a renewed interest in using that variability, incorporating alleles for specific traits, or widening the general variability of elite germplasm. In Europe, there is also an interest in the direct use of local landraces by farmer’s associations seeking agriculture that preserves crop diversity. Pre-breeding programs are aimed to reduce the yield gap among landraces and improved materials. In the Misión Biológica de Galicia we have carried out three cycles of a S1 recurrent selection program for yield on four local landraces from Northwestern Spain with the objective of obtaining improved populations that might be cultivated by farmers and that could be used as sources of superior inbred lines. One hundred plants were selfed in each landrace and the S1 families were evaluated in a 10 × 10 simple lattice. The 20 S1 families with the highest grain yields were randomly intercrossed to form the selected population of each landrace. After three cycles of selection, each population and its cycles of selection were evaluated in three locations for two years. All the populations had a consistent yield gain in the first cycle of selection. However, the response in later cycles differed among the populations: one population had a continuous increase of 21% per cycle while two populations had a reduced yield in the last cycles. Our results highlight the need to include secondary traits to avoid unintentional indirect effects. We conclude that, in pre-breeding programs, it could be worthy to use large effective numbers to prevent inbreeding depression, particularly when the objective is the direct use of improved landraces. Another conclusion is that recurrent selection does not seem to be as efficient on European germplasm as it is on Corn Belt varieties. Finally, obtaining valuable new germplasm requires a sustained, long-term effort.

Raspberry Pi-Based IP Public Address, CCTV, and Access Control System for Educational Purposes

This paper presents a cooperative project developed by two technical vocational schools. The project consists of the design and implementation of a prototype of an IP Public Address, closed circuit TV (CCTV) and access control system that uses the "Raspberry Pi" single-board computer as control system and non-electronic parts made with a 3D printer. The aim of the project is training students in maintenance of Voice over IP, audio and video. The project has been funded by the regional government <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Xunta de Galicia</i> .

Multivariate Statistical Approach for the Discrimination of Honey Samples from Galicia (NW Spain) Using Physicochemical and Pollen Parameters.

Raw honey is a food with a close relation to the territory in which it is produced because of factors such as soil conditions, weather patterns, and plant communities living in the area together. Furthermore, beekeeping management affects the properties of honey. Protected Geographical Indication Miel de Galicia protects the honey produced in Galicia (Northwest Spain). Various types of honeys (362 samples) from this geographical area were analyzed using chemometric techniques. Principal component analysis was favorable to analyzing the physicochemical and pollen variables with the greatest weight in the differentiation of honey. The linear discriminant analysis correctly classified 89.8% of the samples according to the botanical origin using main pollen spectra and physicochemical attributes (moisture, pH, electrical conductivity, diastase content, phenols, flavonoids, and color). Regarding unifloral honey, blackberry, eucalyptus, and heather honeys were correctly grouped, while five chestnut honeys and fourteen samples of honeydew honeys were misclassified. The chestnut and honeydew honeys have similar physicochemical properties and frequently similar pollen spectra profiles complicating the differentiation. Experimental evidence suggests the potential of multivariate statistics in the characterization of honey of the same geographical origin. Therefore, the classification results were good, with electrical conductivity, total phenol content, total flavonoid content and dominant pollens Eucalyptus, Erica, Rubus and Castanea sativa as the variables of higher importance in the differentiation of botanical origin of honeys.

CD34+ progenitor cells as diagnostic and therapeutic targets in Alzheimer's disease.

CD34+ progenitor cells as diagnostic and therapeutic targets in Alzheimer's disease.

From Political Consensus to Political Conflict and Back Again: Language Public Policy in Galicia (1989–2020)

Language public policy is a key issue in Galician politics. Its symbolic uses have proven to be a powerful political resource in partisan competition. This article analyzes the strategies of the three main Galician political parties to test three related hypotheses about how political competition and language public policy are linked: (i) adversary language public policy works as a valid strategy for opposition and electoral campaigning, but (ii) it becomes a major policy problem once in office, both for nationalist and non-nationalist parties, and (iii) advocating for careful balance between languages is the best political strategy for language public policy once in office. The Spanish and Galician right-wing party, Popular Party—PP/PPdeG—which was in office between 1989 and 2005, has strategically promoted language public policies based on an alleged equilibrium between the Spanish language—Castellano—and the Galician language—Galego—to gain nationalist conservative voters and to divide the nationalist political space. During this period, the nationalist—Bloque Nacionalista Galego (BNG)—and socialist—Partido dos Socialistas de Galicia (PSdeG/PSOE)—opposition have supported positive discrimination for the Galego language. Political change in 2005 switched their positions; PP stood for increasing protection for Castellano, while the new nationalist and left-wing government promoted a stronger status for Galego. PP’s return to office in 2009 has switched the positions again.

Vacuum Einstein field equations in smooth metric measure spaces: the isotropic case* *Supported by projects PID2019-105138GB-C21/AEI/10.13039/501100011033 (Spain) and ED431C 2019/10 (Xunta de Galicia, Spain).

On a smooth metric measure spacetime (M, g, e −f dvol g ), we define a weighted Einstein tensor. It is given in terms of the Bakry–Émery Ricci tensor as a tensor which is symmetric, divergence-free, concomitant of the metric and the density function. We consider the associated vacuum weighted Einstein field equations and show that isotropic solutions have nilpotent Ricci operator. Moreover, the underlying manifold is a Brinkmann wave if it is two-step nilpotent and a Kundt spacetime if it is three-step nilpotent. More specific results are obtained in dimension 3, where all isotropic solutions are given in local coordinates as plane waves or Kundt spacetimes.