Understanding the causes of maize landrace loss in farmers’ field is essential to design effective conservation strategies. These strategies are necessary to ensure that genetic resources are available in the future. Previous studies have shown that this loss is caused by multiple factors. In this longitudinal study, we used a collection of 93 maize landrace accessions from Morelos, Mexico, and stored at the International Maize and Wheat Improvement Center (CIMMYT) Maize Germplasm Bank, to trace back to the original 66 donor (...) families after 50 years and explore the causes for why they abandoned or conserved their seed lots. We used an actor-centered approach, based on interviews and focus group discussions. We adopt a Multi-Level Perspective framework to examine loss as a process, accommodating multiple causes and the interactions among them. We found that the importance of maize landrace cultivation had diminished over the last 50 years in the study area. By 2017, 13 families had conserved a total of 14 seed lots directly descended from the 1967 collection. Focus group participants identified 60 accessions that could still be found in the surrounding municipalities. Our findings showed that multiple interconnected changes in maize cultivation technologies, as well as in maize markets, other crop markets, agricultural and land policies, cultural preferences, urbanization and climate change, have created an unfavorable environment for the conservation of maize landraces. Many of these processes were location- and landrace-specific, and often led to landrace abandonment during the shift from one farmer generation to the next. (shrink)

L’idea di una comunità politica fondata sulla giustizia rappresenta in Pla¬tone una doppia terapia: quella della malattia della città, che è conflittuale perché divisa in centri privati di interessi e di affetti, e dell’anima, scissa in centri motivazionali opposti che rendono difficile il comando della razionalità. La comunità politica non è un dato naturale o storico, ma un progetto, un costrutto artificiale, cioè il compito di una élite intellettuale . Ma questa comunità si realizza intanto nella pratica discorsiva e nella (...) decisione morale di quanti ne fanno il proprio orizzonte etico-politico.The idea of a political community founded on justice represents in Plato a therapy both for the illness of the city , and of the soul . The just political community is not for Plato a natural or historical fact, rather a project, an artificial construct, that is the task of an intellectual élite . But meanwhile such community exists in the dialogical practice and in the moral decision of those accepting it as their own ethical and political horizon. (shrink)

This contribution sketches the path that St. Ignatius traversed from excluding in 1541 educational work as a Jesuit ministry to his decision to found colleges and universities as apostolic woks of the Society for the formation of young lay students. Ignatius determined in 1553 that the Collegio Romano should be marked by universality in its make-up and outreach, and furthermore should exercise influence on the other colleges of the Society in Europe. From these beginnings, a comprehensive instructional program emerged in (...) the definitive Ratio studiorum of 1599. We relate the organisation of the courses in literature and in the Faculty of Philosophy, which included pure and applied mathematics. The Faculty of Theology included a course on casus conscientiae or moral theology, and in the 18th century it added chairs of Canon Law, Church History, and Liturgy. In conclusion this article describes the three public «academies» founded for the intellectual and religious formation of select groups of students. Also, we tell of the instruction given in the exact sciences, with mention of some of more famous professors. (shrink)

Al maestro inglese sono attribuite due opere di logica: la Logica sive tractatus de veritate propositionum e le Consequaentiae, entrambe scritte molto probabilmente intorno al 1360. In queste opere Ferrybridge elabora due teorie dell'inferenza, diverse tra loro e caratterizzate in modo originale rispetto alla tradizione coeva. Nel presente saggio l'A. si propone di ricostruire ed analizzare le due teorie, individuandone analogie e differenze e tentando di determinare la loro posizione nell'ambito della tradizione logica medievale, con riferimento alle tesi di Buridano, (...) Pietro di Mantova, Paolo Veneto, Walter Burley. Dopo un'analisi contenutistica dei due testi, l'A. giunge a stabilire tre importanti differenze tra essi: la prima è costituita dal fatto che nella Logica viene formulato esplicitamente un criterio generale per determinare la necessità di un enunciato condizionale, mentre nelle Consequaentiae non vi è traccia di tale tentativo; la seconda riguarda il fatto che mentre nelle Consequaentiae viene rifiutata la validità delle consequaentiae con antecedente impossibile o conseguente necessario, nella Logica tale validità viene pienamente accettata; la terza differenza infine è data dalla diversa classificazione delle consequaentiae formulata nelle due opere. In appendice viene pubblicata l'ultima parte della Logica e cioè un trattato dedicato alla determinazione delle condizioni secondo cui un enunciato condizionale è necessario. (shrink)

THE TWEET OF THE UNIVERSE. GRAVITATIONAL WAVES BETWEEN THEORY, EFFORTS AND MISTAKES The recent discovery of gravitational waves fills a substantial gap in the theory of general relativity, since these waves were the only phenomenon predicted by Einstein’s theory that had not yet been directly observed. This was mainly due to the fact that the passage of waves is an elusive phenomenon, almost imperceptible, up to the point that even Einstein thought that it was almost impossible to detect it using (...) “traditional” tools. This paper will explore the efforts made over the years to detect the passage of these waves, the mistakes made, and the recent results obtained through the use of the twin optical interferometers LIGO and VIRGO. This extraordinary discovery shows one more time that the history of science is full of trials, errors and sudden steps forward maybe due to the use of new technology. (shrink)

In questo studio sono pubblicate alcune lettere inedite, conservate nella Bibliothèque Publique et Universitaire di Ginevra, risalenti agli anni 1669-1678, scambiate tra Jean-Robert Chouet e Claude Pajon. Grazie all’apporto di questi due protagonisti delle accademie di Saumure di Ginevra è possibile meglio intendere, nella complessità dei riferimenti e delle sfumature, le soluzioni relative al tema della libertà divina nell’opera della creazione e della redenzione, argomento di grande interesse nella speculazione filosofica e teologica del Seicento. Si tratta di documenti (...) preziosi, in particolare per la storia della filosofia cartesiana, in quanto il confronto critico, che verte soprattutto sulle tesi di Cartesio concernenti la volontà divina e umana, offre a Chouet l’opportunità di intervenire a chiarire, contro riduttive letture volontaristiche, il significato della dottrina cartesiana della «volonté souveraine et independante de Dieu». (shrink)

The relation between the moral account of the capital vices and the philosophical analysis of the passions of the human soul undergoes an important turning point from the 11th century onwards during the recovery of medical knowledge in the medieval West. In this wave of fervour towards a physiological approach in the investigation of the nature of man, the vice of acedia - as described by the Christian moral tradition - and the melancholic temperament - the result of a millenary (...) reworking and technicalisation of medical knowledge - found a point of contact in the passion of sadness. If authors such as Albert the Great and Thomas Aquinas, following the Christian heritage, characterised acedia as an escalation of the passion of sadness, the medical tradition from Hippocrates and Galen to Avicenna and Constantine recognised sadness as one of the most distinctive manifestations of the melancholic temperament. The aim of this study is to demonstrate, by retracing some aspects of this interweaving of traditions after the year 1000, how Dante’s description of the sinners of acedia in Canto VII of the Inferno takes up the legacy of this hybridisation between the Christian description of acedia and the physiological description of melancholy. (shrink)