Abstract: The egg weight (EW) increases as the hen ages, but unfortunately, eggshell quality does not improve with increasing EW. Dietary changes can help control the increase EW, resulting in improved eggshell quality. This experiment aimed to deterMomine the effect of different digestive lysine (dLYS) levels on the production performance and eggshell quality of 82-87-week-old Lohmann Brown hens and identify the optimal level of dLYS intake to achieve an optimal production performance and the level of dLYS that can improve eggshell quality by modifying EW. A total of 240 Lohmann Brown hens were selected for the experiment (79-87 weeks). These were distributed in individual cages and 6 treatments with 40 replicates per treatment. The cages were divided into 40 blocks of 6 consecutive cages. In each block, the treatments were randomly distributed in the room. The treatments were 6 different diets with different dLYS levels (6.72, 6.40 (control diet (CON)), 6.08, 5.76, 5.44, 5.12 g/kg). The production performance and eggshell quality were evaluated, and the ideal dLYS was calculated by linear broken-line regression. Modifying dLYS levels from 6.08 to 5.12 g/kg decreased a hen day egg production (HDEP) by 4.4%, and reduced egg mass (EM) by 3.2 g/d. Adjusting dLYS levels from 5.44 to 5.12 g/kg reduced 2.2 g the egg weight (EW). Changing dLYS levels from 6.40 to 5.44 g/kg increased the average feed daily intake (ADFI) by 5 g. The different dLYS levels did not affect the feed conversion ratio (FCR), but it showed a tendency (P = 0.074). Eggshell quality attributes were not affected by different dLYS levels. The optimal dLYS intake requirement was 713, 646, 626, and 627 mg/b/d to achieve an optimal HDEP, EW, EM, and FCR respectively. In conclusion, the results of this experiment can help the laying hen industry to determine the optimal dLYS for managing EW increase, keeping a good HDEP, EM, FCR, and maintaining eggshell quality in long-life laying hens.

Background: Type 2 diabetes is often a stigmatized condition as it is considered a lifestyle-related disease in many societies. It is important to understand stigma and its sources, but little research on this matter was found in the UK. This study aimed to investigate perceived stigma, self-stigma and flourishing in the context of type 2 diabetes. Method: The present study sought to investigate the lived experiences of people with a type 2 diabetes diagnosis in the UK. Qualitative semi-structured interviews were conducted, 6 individuals living with type 2 diabetes were interviewed (aged 41-79 years; 66.67% female; 33.33% male). Results: Reflective thematic analysis of the data generated four overarching themes. The first theme, ‘Receiving a diabetes diagnosis’ encapsulates the psychological reaction at the time participants received their diagnosis. The second theme, ‘coping with diabetes’ encapsulates what patients experience after diagnosis. The third theme, ‘Accepting the diagnosis’ shows current attitudes and feelings towards diabetes. Finally, the fourth theme, ‘Stigma around type 2 diabetes’ refers to the attitudes participants have perceived from others and its sources. Discussion: The results indicate that patients in this study perceive stigma from health providers, media, and the general population, but they have not internalised it. They believe stigmatising comments come from a lack of awareness and lack of knowledge about diabetes. The findings demonstrate gaps in the patient-health provider relationship that lead to resistance towards attending medical appointments.

Mauricio Nasi Lignarolo (b. Bogotá, 1949* - 2023) is an Italian/Colombian composer, harpist, multikeyboard instrumentalist, and biologist currently living in Bogotá, Colombia, where he has lectured at colleges and universities, offered composition workshops and seminars, and performed in a variety of ensembles. Maestro Nasi is a multi-faceted individual, immersed in numerous fields of the arts and sciences, and a speaker of multiple languages, including Latin. He began composing in 1975 and to date has written a total of 183 musical works, several of them adapted in diverse instrumental versions. Currently, most of his works remain unpublished. His creative style revives traditional tonality and musical modes, with clear romantic-impressionist influences, writing toccatas, berceuses, and pavanes, predominantly—a body of work that positions him as a leading cosmopolitan modern composer. The data for my doctoral essay has been primarily collected directly from the primary source, Maestro Nasi, through video-recorded interviews, from his archives, and from the manuscripts of all his compositions, which are located in his personal library. This essay classifies and integrates all the information into a detailed biography, a study of his piano pieces, and a complete catalogue of his works in chronological order and by genre. My project brings attention to a remarkable but littleknown artistic voice, introducing him to the English-speaking world. Resumen: Mauricio Nasi Lignarolo (n. Bogotá, 1949* - 2023) es un compositor ítalo-colombiano, arpista, multiinstrumentista de teclado y biólogo. Actualmente reside en Bogotá, Colombia, donde ha impartido conferencias en colegios y universidades, ofrecido talleres de composición y seminarios, y actuado en diversas agrupaciones musicales. El Maestro Nasi es una figura versátil, inmersa en numerosos campos de las artes y las ciencias, y habla varios idiomas, incluido el latín. Comenzó a componer en 1975 y hasta la fecha ha escrito un total de 183 obras musicales, varias de las cuales han sido adaptadas en diversas versiones instrumentales. En la actualidad, la mayoría de sus obras permanecen inéditas. Su estilo creativo revive la tonalidad tradicional y los modos musicales, con claras influencias románticas e impresionistas, componiendo principalmente toccatas, berceuses y pavanas. Este conjunto de obras lo sitúa como un destacado compositor moderno y cosmopolita. Los datos para mi tesis doctoral se han recopilado principalmente directamente de la fuente principal, el Maestro Nasi, a través de entrevistas en video, de sus archivos personales y de los manuscritos de todas sus composiciones, que se encuentran en su biblioteca personal. Esta tesis clasifica e integra toda la información en una biografía detallada, un estudio de sus piezas para piano y un catálogo completo de sus obras en orden cronológico y por género. Mi proyecto llama la atención sobre una voz artística notable pero poco conocida, presentándola al mundo de habla inglesa.

Abstract: An economic model, the Colombian Forest Sector Model (CFSM), was created to analyze Colombia's commercial forest plantation policy spanning from 2018 to 2038 (PFCm policy). The CFSM is an econometric model that uses neoclassical theory to predict quantities and prices in Colombia's forest product markets. Phase I of the CFSM, detailed in this study, includes a growth and yield simulator for Colombian forest plantations and two market submodels: one for Unprocessed Wood and another for Manufactured Wood Products. Using the CFSM-I, two PFCm policy objectives were simulated to reveal their impacts on the Colombian forest sector. Simulations of expanding Colombia's forest plantation area from 0.3 million hectares in December 2015 to 1.5 million hectares by 2025 showed a fivefold increase in the volume of industrial wood available in plantations from 2015 to 2047, averaging 20.8 million cubic meters of underbark roundwood annually. This expansion would significantly affect the unprocessed wood market, multiplying wood supply and exports by 2.5 and 14.5 times, respectively, while reducing the supply price by an average of 24% compared to a scenario without plantation expansion. Simulations of a 5.5-fold expansion in Colombia's manufactured wood forest product industry's current (2022) production capacity from 2023 to 2038 indicated an average 8% increase in the consumption of unprocessed wood and manufactured wood products by the pulp and paper industry over the next 25 years, compared to a no-expansion scenario. Additionally, imports of these products and manufactured furniture industry products would decrease by 35% and 25%, respectively. Simulations of alternative plantation area expansion policies enriched the information available for policymakers and other stakeholders in preparation for the first round of the PFCm policy evaluation, scheduled for 2023 after the initial implementation period ended in December 2022. Resumen: Se creó un modelo económico, el MFSC, para el sector forestal de Colombia, con el propósito de analizar la política de plantaciones forestales comerciales en Colombia para el período 2018-2038 (PFCm). Este modelo, basado en la teoría neoclásica de mercados competitivos, proyecta cantidades y precios en los mercados de productos forestales colombianos. La Fase I del modelo, denominada CFSM-I, se enfoca en el crecimiento de plantaciones forestales y dos submodelos de mercado: madera sin procesar y productos manufacturados de madera. Las simulaciones muestran que una expansión de las plantaciones de 0,3 a 1,5 millones de hectáreas para 2025 incrementaría la disponibilidad de madera industrial en Colombia cinco veces, con un promedio anual de 20,8 millones de metros cúbicos de madera sin corteza. Esta expansión impactaría significativamente el mercado de madera sin procesar, multiplicando la oferta y las exportaciones por 2,5 y 14,5 veces, respectivamente, mientras que reduciría el precio de suministro en un 24% en comparación con la no expansión. Además, simulaciones de una expansión de 5,5 veces la capacidad actual de producción de productos maderables entre 2023 y 2038 indican un aumento del consumo de madera sin procesar y productos maderables manufacturados por la industria de la pulpa y papel en un 8% cada uno. Asimismo, las importaciones de estos productos y de productos manufacturados de la industria del mueble disminuirían un 35% y un 25%, respectivamente, en comparación con el escenario sin expansión. Estas simulaciones de políticas alternativas de expansión enriquecen la información disponible para los responsables de políticas nacionales y otras partes interesadas, de cara a la primera evaluación de la política del PFCm programada para 2023 después de su implementación inicial en diciembre de 2022.

Abstract: Claystone degradation under the effect of freezing and thaw cycles represents a key aspect in the production of erodible material in mountain ranges. Erosion processes have numerous potential consequences such as dam filling, increment in slope instability, increase of badlands, among others. Due to the possible effects related to erosion, numerous research processes have been carried out following primarily experimental approaches based on both soil physical characteristics and mechanical properties. However, these have been based on a macroscopic scale. This document presents the development of a research process based on the implementation of numerical models aimed at representing the processes involved in freezing and thawing phenomena on porous media and their effect on potential changes in soil microfabric. A calibration and validation process of the proposed numerical models was carried out based on experimental measurements of the thermal behavior of soil samples subjected to freezing and thawing cycles. Using the numerical relationships found, a methodology for determining the soil water retention curve (SWRC) was established (as a first approximation) based on a quick and relatively simple freezing and thawing test under undrained conditions. Simultaneously, and following the main objective of the research, the microfabric state during cyclic freezing and thawing was established following the relationship between SWRC and pore size distribution (PSD), as well as the possible hysteresis between freezing and thawing processes. The significant effect of these thermodynamic processes on the state of the terrain, was identified particularly in regard to increased erodibility. One possible cause for particle detachment necessary for erosion processes to occur lies in the development of macroporosity along with the existence of gaps between pore families in the PSD. This behavior was observed through the developed numerical processes. The combined effect of freezing and thawing cycles leads to an increase in soil erodibility. Finally, though a constitutive model-based approach, the cryogenic suction paths associated with freezing and thawing processes under the modification of the soil’s microstructure were established. A final perspective to soil's mechanical degradation is presented in terms of the hydraulic work associated with the cryogenic suction paths developed within the soil mass. Both the progressive evolution of the microstructure (through PSD) and the values of hydraulic work associated with each cycle show an attenuation in the incremental change as the cycles continue. Due to the numerical nature of the approximations and the trends found, further cyclical laboratory tests should be carried out. However, these represent a novel approach to the degradation phenomenon as well as the effects associated with the soil water retention curve.

Abstract: This thesis examines the modeling of inorganic behavior on Twitter and its implications for media dynamics. Three approaches —userbased, activity-based, and text-based detection— are combined to gain insights that benefit journalism and civil organizations. Resumen: Esta tesis examina el modelado del comportamiento inorgánico en Twitter y sus implicaciones para las dinámicas mediáticas. Se combinan tres enfoques (detección basada en características del usuario, basada en su actividad y basada en el contenido textual que publica o con el que interactúa), para encontrar patrones que ayuden a periodistas y organizaciones civiles a entender el fenómeno. Esta es una primera valoración positiva del uso del Inteligencia Artificial para explorar relaciones complejas que tienen significancia cualitativa en el estudio del comportamiento inorgánico en Twitter más allá de la detección.

Abstract: “Green extractivism” refers to the way in which decarbonisation and the transition to green energy as part of the sustainable development policies of the Global North have increased the commodification of nature and expanded the extraction of minerals. Many of these minerals are located in the Global South, and within the territory of peasant and Indigenous communities. One example is the case of Chile, which has some of the largest reserves of lithium in the world; a mineral used for the production of batteries key to renewable energy technologies. In this dissertation, using a political ecology approach, I examine lithium mining in the Salar de Atacama (“the Salar”) in Chile, and the dynamics between the State, extractive companies, and Atacameña Indigenous communities. With the results obtained through a literature review and document analysis, I demonstrate how green extractivism perpetuates asymmetric local relations, and how this is related to the socio-environmental effects faced by Indigenous Atacameña communities due to the exploitation of lithium mining in their territories. Relying on an original analysis of legal and policy documents, I argue that green extractivism highlights the structural deficiencies of lithium mining regulation and Chile's neoextractivist system. These in turn contribute to the unequal and unfair distribution of the socioenvironmental costs of lithium exploitation in the Salar de Atacama. The dissertation shows that mining companies operating in the Salar benefit from the commodification of nature and transfer externalities to local communities to bear the costs of the green economy policies of the Global North. Nevertheless, I explain that the Atacameña Indigenous communities, despite being in an asymmetric relationship, have assumed an active role, through legal and political mechanisms, in defending their rights and demanding that companies and the State recognise their obligations to protect the Salar’s ecology. The dissertation concludes by contemplating possible political changes through a new constitution in Chile in the next few years and what this may mean for the dominance of green extractivism, especially for the Salar.

Abstract: This study investigates the association between individual characteristics, normative beliefs about aggression, and involvement in antisocial and illegal activities among Colombian adolescents. The research explores temperament traits, such as effortful control, anger/frustration, and callous unemotional, and examines how these relationships differ between individuals engaged in antisocial acts and those who are not. Two groups of adolescents, one within the juvenile justice system and one outside, were analyzed. The results partially support the hypotheses based on the literature. The internal consistency of the scales used to measure individual characteristics and normative beliefs was confirmed partially. Effortful control and anger/frustration did not reach acceptable reliability levels, while normative belief scales showed good reliability. The study confirmed hypothesized relationships between aggression beliefs and levels of effortful control and anger/frustration. However, the hypothesized association between callous unemotional traits and beliefs was not confirmed. Comparing the two groups, higher levels of anger/frustration were associated with greater perceived normativity of aggressive behavior in both offenders and non-offenders. Higher levels of effortful control were associated with lower perceived normativity of aggressive behavior in offenders. Surprisingly, no significant association was found between callous unemotional traits and normativity of aggressive behavior in both groups. Predictive analysis indicated that higher levels of anger/frustration and callous unemotional traits significantly increased the risk of belonging to the offender group. However, normative belief in aggressive behavior emerged as a stronger predictor of vulnerability to antisocial behavior. The study concludes that while the internal consistency of the administered questionnaire was not entirely satisfactory, it provides valuable insights into individual characteristics and their association with maladaptive developmental outcomes, such as adolescent delinquency. The findings suggest a potential adaptive temperamental pattern that could be further investigated for its protective factors, especially within the Colombian juvenile justice system. The study recommends future research using scales adapted specifically to the Colombian context and suggests a more detailed analysis considering additional variables like the type of crime, punishment received, and recidivism. The lack of predictive value of social stratum implies that becoming an adolescent offender is not influenced by the family's economic status. The results regarding anger/frustration and callous unemotional traits highlight their significance in predicting adolescent offender status, while the perceived normativity of aggressive behavior stands out as a crucial predictor of vulnerability to antisocial behavior.

Abstract: The research explores the role of regional Planning in fostering sustainable development in Colombia's diverse Pacific economic, social, and environmentally challenging context. Regional Planning is a traditional process that aims to enhance competitiveness, infrastructure connectivity between territories, and economic growth while addressing contemporary priorities like sustainable development. In response to these challenges, the Administrative and Planning Region (RAP Pacífico) in 2016 was created as a cooperative entity encompassing Pacific departments. This initiative seeks to stimulate economic and social development while overcoming financial, technical, and capacity related constraints. RAP Pacífico, through its Regional Strategic Plan, approved in 2021, departs from conventional approaches by adopting a collaborative and multidimensional strategy involving local authorities, private enterprises, and civil society. This research examines its innovative design strategies under the social innovation theory and its alignment with sustainable development goals. Moreover, the analysis sheds light on the potential of incorporating innovative elements in Planning exercises addressing complex societal challenges and aiming for regional sustainable development within the public management context, particularly in developing nations.

Abstract: Material Adverse Change clauses (MAC clauses) are contractual provisions that are usually incorporated within M&A and debt finance transactions. However, the low number of disputes that have arisen regarding the interpretation and application of such provisions have raised concerns given the uncertainty of its application and construction by the courts. Although the doctrine of good faith has been regarded as alien to English Contract Law, in this dissertation that claim is challenged by exploring other dimensions of such principle through two Civil Law jurisdictions and two recent judgements in English Law concerning MAC clauses in the context of Loan Agreements. Resumen: Las cláusulas de Cambio Adverso Sustancial (MAC, por sus siglas en inglés) son disposiciones contractuales que generalmente se incorporan en transacciones de fusiones y adquisiciones, así como en transacciones de financiamiento de deuda. Sin embargo, la baja cantidad de disputas que han surgido respecto a la interpretación y aplicación de tales disposiciones ha generado preocupación dada la incertidumbre en su aplicación y construcción por parte de los tribunales. Aunque la doctrina de la buena fe ha sido considerada ajena al Derecho de Contratos inglés, en esta tesis se cuestiona esa afirmación al explorar otras dimensiones de dicho principio a través de dos jurisdicciones de Derecho Civil y dos sentencias recientes en el Derecho inglés relacionadas con cláusulas MAC en el contexto de Acuerdos de Préstamo.