22077 research outputs found
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Dichotomous keys to the bee genera of Portugal: Hymenoptera: Anthophila
Full text linkeditorial reviewedAs abelhas (Hymenoptera: Anthophila), com cerca de 750 espécies em Portugal, são um grupo de insetos polinizadores cruciais para o funcionamento dos ecossistemas e para a segurança alimentar. No entanto, as abelhas enfrentam fortes ameaças, com tendências negativas tanto na abundância de indivíduos como na diversidade de espécies. Neste contexto, é urgente desenvolver ações de conservação que garantam a proteção da biodiversidade e a sustentabilidade dos ecossistemas a longo prazo. Estas ações de conservação devem, no entanto, ser desenhadas e implementadas com base em planos de ação e programas de monitorização robustos implementados a longo prazo. Paralelamente, ao longo de várias décadas, assistimos a um desinvestimento na taxonomia dos insetos resultando num número limitado de entomólogos para o acompanhamento dos planos de ação. Nesse sentido, é crucial capacitar as novas gerações na área da entomologia, e em particular na identificação de abelhas. Este trabalho é uma adaptação de Michez et al. (2024) e representa uma versão atualizada das chaves dicotómicas dos géneros de abelhas de Portugal. Neste trabalho é feita uma caracterização geral sobre o ciclo de vida, ecologia e morfologia externa, resumem-se as famílias, subfamílias, tribos e géneros presentes em Portugal, incluindo o número de espécies e principais referências bibliográficas disponíveis para subsequente identificação à espécie, e fornecem-se duas chaves de identificação de géneros, uma para fêmeas e outra para machos. Estas chaves têm como objetivo tornar o ensino e a aprendizagem da taxonomia das abelhas de Portugal mais acessível e promover a entomologia.Imprensa da Universidade de Coimbr
Ce que l'autruche voit dans le sable. Usages de la notion de déni dans le Huntingtonland
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Plurilingüisme i tractament integrat de llengües: les polítiques lingüístiques sobre ensenyament gramatical a Andorra
Full text linkpeer reviewedA partir de la constatació del multilingüisme del sistema educatiu del Principat d’Andorra, la pregunta de recerca que es planteja és de quina manera s’introdueix la perspectiva interlingüística en l’ensenyament gramatical de les tres llengües vehiculars (català, francès i castellà). Larecerca té com a marc teòric el concepte de plurilingüisme, el tractament integrat de llengües i l’estat actual de la literatura sobre aprenentatge gramatical. L’estudi empíric, de tall qualitatiu, s’ha efectuat mitjançant l’anàlisi documental d’un corpus de documentació pública constituït pels principals textos normatius en l’àmbit educatiu andorrà, així com els programes de llengües curriculars de l’ensenyament obligatori (entre 6 i 16 anys). Entre els resultats més importants destaca l’aplicaciódel concepte de plurilingüisme, tal com l’entenen la literatura i els instruments del Consell d’Europa, a un sistema educatiu que assumeix el seu multilingüisme sense deixar de jerarquitzar les llengües d’acord amb la seva rellevància institucional o segons un objectiu de compensació sociolingüística. Es confirma igualment la voluntat del legislador andorrà de desenvolupar el tractament integrat de les llengües i d’afavorir l’aprenentatge comunicatiu basat en mètodes inductius. Aquest aprenentatge pot presentar, però, certes mancances, principalment pel que fa a la reflexió metalingüística en l’àmbit de l’ensenyament gramatical
Se lancer en tant que superviseur : De la thérapie systémique à la supervision, regard sur le chemin vers la première expérience de supervision
No full textpeer reviewedLe passage du statut de thérapeute familial à celui de superviseur systémicien s’inscrit dans un processus, souvent marqué par le doute. Se lancer en tant que superviseur nécessite d’accéder à une première demande de supervision et donc d’avoir une sensibilité pour lire les interactions (1), de s’entourer professionnellement (2), de pouvoir faire avec soi-même (3) et d’oser (4). A travers cet article issu de notre recherche doctorale, nous nous proposons de mettre en lumière l’articulation de ces quatre éléments et de formuler quelques pistes quant à l’intérêt de la formation de superviseur
Morpho-functional characterisation of cœlomocytes in the aquacultivated sea cucumber Holothuria scabra: From cell diversity to transcriptomic immune response.
Full text linkpeer reviewedHolothuria scabra is one of the most valuable species of sea cucumber owing to its exploitation as a seafood product. This study aims to describe the main molecular and cellular actors in the immunology of this species. First, a detailed description of the immune cells - the cœlomocytes - is provided, highlighting five main cell types including phagocytes, small round cells (SRCs), spherulocytes, fusiform cells, and crystal cells, with a further five subtypes identified using transmission electron microscopy. Cœlomocyte aggregates were also described morphologically, yielding two main types, one comprising three successive maturation stages. A comparison of the concentration and proportion of cell populations was carried out between the two main body fluids, namely the hydrovascular fluid of the Polian vesicle (HF) and the perivisceral fluid of the general cavity (PF), and no clear relation could be highlighted. Next, the cœlomocyte immune response was studied 24 h after lipopolysaccharide (LPS) injection in the two body fluids. Firstly, the fluctuation in cell populations was assessed, and despite a high inter-individual variability, it shows a decrease in the phagocyte proportion and an increase in the SRC proportion. Secondly, the differential gene expression of PF cœlomocytes was studied by de novo RNA-sequencing between LPS-injected and control-injected individuals: 945 genes were differentially expressed, including 673 up-regulated and 272 down-regulated in the LPS-injected individuals. Among these genes, 80 had a presumed function in immunity based on their annotation, covering a wide range of immune mechanisms. Overall, this study reveals a complex immune system at both molecular and cellular levels and constitutes a baseline reference on H. scabra immunity, which may be useful for the development of sustainable aquaculture and provides valuable data for comparative immunology
Microlearning : Découvrez comment le microlearning peut transformer votre façon d’apprendre et de former
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A theory of FLOSS projects and Open Source business models dynamics
No full textpeer reviewedIn this article, we propose a theory that explains how Free/Libre Open Software (FLOSS) projects work and how companies rely on these FLOSS projects to develop their commercial offers, what we refer to as their "open-source" business model(s). This article builds on and refines the studies of the FLOSS organization by connecting two interrelated aspects: 1) how this organization evolves over time, in order to 2) better understand the value that users create and capture at each moment of a FLOSS project, with a particular focus on open-source companies, which are specific users who do business based on the software created by the FLOSS project. We describe these models and show that the open-source business models of companies are based on contributing to FLOSS projects in order to be able to provide "3A" services (assurance, adaptation, and assistance or support for use) that are complementary to the access to the software. Providing these services requires participation in the FLOSS project, which provides the project with the resources to operate
Decoration of Silver Nanoparticles on WS2-WO3 Nanosheets: Implications for Surface-Enhanced Resonance Raman Spectroscopy Detection and Material Characteristics.
Full text linkpeer reviewedThis study investigates the chemical and structural modifications of vertically aligned tungsten disulfide-tungsten trioxide (WS2-WO3) nanosheets decorated with silver nanoparticles (Ag(NPs)) under nitrogen plasma conditions. The synthesized vertically aligned WS2-WO3 nanosheets were functionalized through direct-current (DC) magnetron sputtering, forming silver-decorated samples. Structural changes, as well as the size and distribution of Ag(NPs), were characterized using scanning electron microscopy (SEM). Chemical state analysis was conducted via X-ray photoelectron spectroscopy (XPS), while Raman spectroscopy was employed to investigate vibrational modes. The findings confirmed the successful decoration of Ag(NPs) and identified unexpected compound transformations that were dependent on the duration of functionalization. The synthesized and functionalized samples were evaluated for their sensing capabilities towards Rhodamine B (RhB) through surface-enhanced resonance Raman scattering (SERRS). This study discusses the impact of substrate morphology and the shape and size of nanoparticles on the enhancement of SERRS mechanisms, achieving an enhancement factor (EF) of approximately 1.6 × 106 and a limit of detection (LOD) of 10-9 M