Colibri Colección : Incluye artículos, objetos de conferencias, seminarios y jornadas, reportes técnicos, comunicaciones y otros.
https://hdl.handle.net/20.500.12008/21981
Incluye artículos, objetos de conferencias, seminarios y jornadas, reportes técnicos, comunicaciones y otros.2024-03-28T19:17:33ZThe legacy of Charles Darwin
https://hdl.handle.net/20.500.12008/43234
Título: The legacy of Charles Darwin
Autor: Tassino, Bettina; Tomasco Introini, Ivanna Haydée2023-01-01T00:00:00ZNuevos registros de Rineloricaria (Teleostei: Siluriformes) para Uruguay
https://hdl.handle.net/20.500.12008/43233
Título: Nuevos registros de Rineloricaria (Teleostei: Siluriformes) para Uruguay
Autor: Loureiro Barrella, Marcelo; Bessonart Rodríguez, José María; Aguilar-Sosa, Ana Belén
Resumen: En base a material de la Colección de Peces de la Facultad de Ciencias (UDELAR), en esta nota realizamos los primeros registros de tres especies de Rineloricaria (Siluriformes: Loricariidae) para Uruguay.; Based on specimens deposited in the Fish Collection of Facultad de Ciencias (UDELAR), in this note we make the first records for three species of Rineloricaria (Siluriformes: Loricariidae) in Uruguay.2023-01-01T00:00:00ZTransforming growth factor-b signalling regulates protoscolex formation in the Echinococcus multilocularis metacestode
https://hdl.handle.net/20.500.12008/43232
Título: Transforming growth factor-b signalling regulates protoscolex formation in the Echinococcus multilocularis metacestode
Autor: Kaethner, Marc; Epping, Kerstin; Bernthaler, Peter; Rudolf, Kilian; Thomann, Irena; Leitschuh, Nadine; Bergmann, Monika; Spiliotis, Markus; Koziol, Uriel; Brehm, Klaus
Resumen: The lethal zoonosis alveolar echinococcosis (AE) is caused by tumor-like, infiltrative growth of the metacestode larval stage of the tapeworm Echinococcus multilocularis. We previously showed that the metacestode is composed of posteriorized tissue and that the production of the subsequent larval stage, the protoscolex, depends on re-establishment of anterior identities within the metacestode germinative layer. It is, however, unclear so far how protoscolex differentiation in Echinococcus is regulated. We herein characterized the full complement of E. multilocularis TGFb/BMP receptors, which is composed of one type II and three type I receptor serine/threonine kinases. Functional analyzes showed that all Echinococcus TGFb/BMP receptors are enzymatically active and respond to host derived TGFb/BMP ligands for activating downstream Smad transcription factors. In situ hybridization experiments demonstrated that the Echinococcus TGFb/BMP receptors are mainly expressed by nerve and muscle cells within the germinative layer and in developing brood capsules. Interestingly, the production of brood capsules, which later give rise to protoscoleces, was strongly suppressed in the presence of inhibitors directed against TGFb/BMP receptors, whereas protoscolex differentiation was accelerated in response to host BMP2 and TGFb. Apart from being responsive to host TGFb/BMP ligands, protoscolex production also correlated with the expression of a parasite-derived TGFb-like ligand, EmACT, which is expressed in early brood capsules and which is strongly expressed in anterior domains during protoscolex development. Taken together, these data indicate an important role of TGFb/BMP signalling in Echinococcus anterior pole formation and protoscolex development. Since TGFb is accumulating around metacestode lesions at later stages of the infection, the host immune response could thus serve as a signal by which the parasite senses the time point at which protoscoleces must be produced. Overall, our data shed new light on molecular mechanisms of host-parasite interaction during AE and are relevant for the development of novel treatment strategies.2023-01-01T00:00:00Z12,500+ and counting: biodiversity of the Brazilian Pampa
https://hdl.handle.net/20.500.12008/43231
Título: 12,500+ and counting: biodiversity of the Brazilian Pampa
Autor: Andrade, Bianca O; Dröse, William; Maneyro, Raúl
Resumen: Knowledge on biodiversity is fundamental for conservation strategies. The Brazilian Pampa region, located in subtropical southern Brazil, is neglected in terms of conservation, and knowledge of its biodiversity is fragmented. We aim to answer the question: how many, and which, species occur in the Brazilian Pampa? In a collaborative effort, we built species lists for plants, animals, bacteria, and fungi that occur in the Brazilian Pampa. We included information on distribution patterns, main habitat types, and conservation status. Our study resulted in referenced lists totaling 12,503 species (12,854 taxa, when considering infraspecific taxonomic categories [or units]). Vascular plants amount to 3,642 species (including 165 Pteridophytes), while algae have 2,046 species (2,378 taxa) and bryophytes 316 species (318 taxa). Fungi (incl. lichenized fungi) contains 1,141 species (1,144 taxa). Animals total 5,358 species (5,372 taxa). Among the latter, vertebrates comprise 1,136 species, while invertebrates are represented by 4,222 species. Our data indicate that, according to current knowledge, the Pampa holds approximately 9% of the Brazilian biodiversity in an area of little more than 2% of Brazil’s total land. The proportion of species restricted to the Brazilian Pampa is low (with few groups as exceptions), as it is part of a larger grassland ecoregion and in a transitional climatic setting. Our study yielded considerably higher species numbers than previously known for many species groups; for some, it provides the first published compilation. Further efforts are needed to increase knowledge in the Pampa and other regions of Brazil. Considering the strategic importance of biodiversity and its conservation, appropriate government policies are needed to fund studies on biodiversity, create accessible and constantly updated biodiversity databases, and consider biodiversity in school curricula and other outreach activities.
Descripción: Este artículo fue escrito por 126 autores.2023-01-01T00:00:00Z