Publicacions de projectes de recerca del Plan Nacional
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Publicacions resultants de projectes de recerca del Plan Nacional.
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- ItemOpen AccessToken graphs of cayley graphs as lifts(International Linear Algebra Society, 2024-05) Dalfó, Cristina; Fiol Mora, Miguel Ángel; Pavlíková, Sona; Siran, JozefThis paper describes a general method for representing k-token graphs of Cayley graphs as lifts of voltage graphs. This allows us to construct line graphs of circulant graphs and Johnson graphs as lift graphs on cyclic groups. As an application of the method, we derive the spectra of the considered token graphs. The method can also be applied to dealing with other matrices, such as the Laplacian or the signless Laplacian, and to construct token digraphs of Cayley digraphs.
- ItemOpen AccessThe effects of ENDOG on lipid metabolism may be tissue-dependent and may not require its translocation from mitochondria(Nature Research, 2024) Llovera i Tomàs, Marta; Gouveia, Leonor; Zorzano, Antonio; Sanchis, Daniel
- ItemOpen AccessInfluence of physicochemical characteristics on the growth and guaiacol production of Alicyclobacillus acidoterrestris in fruit juices(Elsevier, 2024-08-10) Neggazi, Isma; Colás Medà, Pilar; Viñas Almenar, Inmaculada; Bainotti, Maria Belén; Alegre Vilas, IsabelAlicyclobacillus acidoterrestris is a bacterium known for causing spoilage in the taste and odour of fruit juices due to its thermoacidophilic nature. Its spoilage is attributed to the formation of guaiacol, which requires the presence of suitable precursors in the juices that A. acidoterrestris can metabolize. Therefore, A. acidoterrestris could exhibit different behaviour depending on the physicochemical characteristics the juice. In this study, we aimed to evaluate the behaviour of five A. acidoterrestris strains in seven different fruit juices by monitoring total cell and spore populations and quantifying guaiacol production. Also, physicochemical and phenolic profile, focusing on antimicrobials and guaiacol precursors, were analysed to better understand differences. Results showed growth in orange, apple, and plum juices for all the tested strains, with total cell populations reaching approximately 7 log cfu/mL, except for plum juice. In persimmon juice, growth was only observed in 3 out of 5 strains, for both total cells and spores. In contrast, all strains were inhibited in peach, black grape, and strawberry juices, maintaining a consistent population around 4 log cfu/mL. A strong negative correlation was observed between bacterial population and compounds such as kaempferol (for strains R3, R111, and P1), cyanidin chloride (for strains R111 and P1), and p-coumaric acid (for strain 7094 T). Regarding guaiacol production, orange and persimmon juices exhibited the highest guaiacol levels, with strain P1 (362.3 ± 12.6 ng/mL) and strain EC1 (325.1 ± 1.4 ng/mL) as the top producers, respectively. Plum, black grape, and strawberry juices showed similar guaiacol concentrations (16.9 ± 2.8 to 105.0 ± 33.7 ng/mL). Vanillin was showed positive correlations with guaiacol production in almost all strains (7094 T, R3, R111, and P1), with correlation coefficients of 0.97, 0.99, 0.82, and 0.87, respectively. We have reported different behaviour of A. acidoterrestris strains depending on juice type. Despite growth inhibition observed in some juices, enough guaiacol quantities to spoil the juice can be produced. This highlights the necessity of exploring strategies to prevent guaiacol production, even under growth restriction.
- ItemOpen AccessThe Antilisterial Effect of Latilactobacillus sakei CTC494 in Relation to Dry Fermented Sausage Ingredients and Temperature in Meat Simulation Media(MDPI, 2024-06-20) Ferrer-Bustins, Núria; Costa, Jean Carlos Correia Peres; Pérez-Rodríguez, Fernando; Martín, Belén; Bover-Cid, Sara; Jofré, AnnaListeria monocytogenes, the causative agent of listeriosis, is a relevant pathogen in dry fermented sausages (DFSs), and the application of antilisterial starter cultures is an effective intervention strategy to control the pathogen during DFS production. The effect of factors in relation to DFS formulation and production, NaCl (0-40 g/L), Mn (0.08-0.32 g/L), glucose (0-40 g/L) and temperature (3-37 °C), on the behaviour of L. monocytogenes when cocultured with Latilactobacillus sakei 23K (non-bacteriocinogenic) and CTC494 (bacteriocinogenic) strains was studied through a central composite design in meat simulation media. L. sakei and L. monocytogenes counts, pH, lactic acid production and bacteriocin activity were determined in mono and coculture. The pH decrease and lactic acid production were highly influenced by glucose, while production of sakacin K by L. sakei CTC494 was observed at moderate (10 and 20 °C), but not at the lowest (3 °C) and highest (37 °C), temperatures. Coculture growth had no effect on the acidification and bacteriocin production but inhibited and inactivated L. monocytogenes when L. sakei 23K entered the early stationary phase and when L. sakei CTC494 produced sakacin K. Optimal conditions for achieving a 5-log units reduction of L. monocytogenes were at 20 °C, 20 g/L of NaCl, 0.20 g/L of Mn and 40 g/L of glucose, those highlighting the importance of considering product formulation and fermentation conditions for bioprotective starter cultures application.
- ItemOpen AccessManifestaciones actuales de la segregación residencial en ciudades medias españolas(Programa de Pós-Graduação em Geografia, Universidade Federal do Rio de Janeiro, 2024-07-21) Bellet, Carme; Andrés López, GonzaloEste trabajo realiza una aproximación al análisis de la desigualdad y la segregación de los grupos de renta alta y renta baja en las áreas urbanas de las ciudades medias españolas. Se utilizan distintas variables de caracterización sociodemográfica y se calculan los índices clásicos de medición para estudiar este fenómeno (índice de desigualdad, de segregación, de disimilitud y de aislamiento). En general, los resultados detectan unos niveles de desigualdad y segregación menos intensos que los identificados para las grandes ciudades. Se confirma además una clara disimilitud entre los dos grupos de renta, evidenciándose el mayor grado de segregación residencial de las rentas altas. Por su parte, en los grupos de renta baja se aprecia un incremento progresivo de la segregación con la presencia de la población extranjera y los altos niveles de desempleo. Finalmente, se establece una clasificación de las áreas urbanas según sea su índice de segregación y trata de correlacionarse esta gradación con algunas variables socioeconómicas. En todos los casos se hace patente la complejidad del fenómeno como una cuestión multidimensional que requiere profundizar en la investigación sobre esta realidad en las áreas urbanas españolas.
