https://repositorio.uca.edu.ar/handle/123456789/5282 2026-04-18T16:45:35Z https://repositorio.uca.edu.ar/handle/123456789/21099 Título: Spatial Variation in Turf Surface Properties of Polo Pitches: A Case Study of Different Handicaps of Argentina Autor: Blanco, María Alejandra; Peterson, Michael L.; Cipriotti, Pablo Ariel; Apecechea, Fernando Resumen: Polo is a high-speed equestrian sport that imposes mechanical demands on horses and turf, yet limited research has examined the functional behavior of polo playing surfaces. This study characterizes the spatial variability of mechanical surface properties across turf polo pitches representing high-, medium-, and low-handicap categories. Three fields were assessed using lightweight field-based instruments, including the Impact Test Device (ITD), Rotational Peak Shear (RPS) tester, Going Stick© for penetration (GSP) and shear (GSS), and a TDR probe for volumetric moisture content (VMC%). A total of 210–223 grid-based sampling points per pitch were analyzed to evaluate mechanical responses under vertical and horizontal loading conditions. Significant differences among pitches were observed, with ITD and VMC emerging as the indicators of surface behaviour. Spatial analysis revealed heterogeneous within-pitch patterns, expressed as directional gradients and localized variability. Linear discriminant analysis demonstrated that the combined measurements could differentiate pitches associated with different handicap levels with high classification accuracy (0.88). Although the applied instruments do not replicate full equine biomechanical loading, they proved effective in detecting spatial variability in surface uniformity, a functional property relevant to performance and equine welfare. These findings support integration of spatially explicit surface assessments into routine turf management practices. 2026-01-01T00:00:00Z https://repositorio.uca.edu.ar/handle/123456789/20879 Título: Insights on the molecular interactions of tapioca starch with xylitol, Arabic gum, and pectin and their effects on its pasting properties and retrogradation kinetics Autor: Rolandelli, Guido; Rodríguez, Silvio David; Buera, María del Pilar Resumen: Pasting properties and retrogradation kinetics of tapioca starch (TS) systems with different added concentrations of xylitol (X), Arabic gum (AG), and pectin (P) were evaluated by nuclear magnetic resonance ( 1 H-NMR) and differential scanning calorimetry (DSC) after storage at 4 ◦C for 21 days. The incorporation of the additives reduced the peak, final and setback viscosity of the pastes, indicating limiting gelatinization of TS for the establishment of non-covalent interactions with water and/or starch, restricting further hydration and swelling. Based on 1 H-NMR results, free water molecules were involved in the reassociation of amylose and amylopectin chains; thus, their molecular mobility decreased with the progress of starch retrogradation, as evidenced by the diminishment of the spin-spin relaxation times. DSC results confirmed that the addition of X delayed TS retro gradation, possibly due to the generation of hydrogen bonds interactions, while opposite results were obtained when AG was added, which promoted TS molecules reorganization. P showed a concentration-related effect, since it delayed TS retrogradation at 1 % level and accelerated it at 2 % concentration. Results from this study provide insights on the molecular interactions of TS with xylitol, Arabic gum, and pectin and their modulating effects on starch retrogradation, which are valuable for the development of gluten-free products with varied industrial applications. 2025-01-01T00:00:00Z https://repositorio.uca.edu.ar/handle/123456789/20837 Título: Laws of Large Numbers, Spectral Translates and Sampling over LCA Groups Autor: Medina, Juan Miguel Resumen: Kluv´anek extended the Whittaker-Kotel’nikov-Shannon theorem to the abstract harmonic analysis setting over a LCA group G. In this context, the classical condition for f ∈ L 2 (R) to be band limited is replaced by fb having its support essentially contained in a transversal set of a compact quotient group. This condition was later shown to be necessary in general. Moreover, the classical interpolation formula is also equivalent to a Plancherel like isometric formula involving the L 2 (G) norm of f and the norm of the sequence of its samples over a subgroup H. Here, recalling some Laws of Large Numbers, we will prove an equivalent result for the support of the spectral measure µX of a Gaussian stationary random process X, indexed over a LCA group G. The conditions are formulated in terms of an almost sure isometric formula involving the sample variances of X, and its samples over a subgroup H respectively. 2022-01-01T00:00:00Z https://repositorio.uca.edu.ar/handle/123456789/20826 Título: Xylem Sap Mycobiome in Grapevine Naturally Infected with 2 Xylella fastidiosa. A Case Study: Interaction of 3 Xylella fastidiosa with Sclerotinia sclerotiorum Autor: Perelló, A.; Romero Munar, A.; Martinez, I.; Busquets, A.; Cañellas, M.; Quetglas, B. M.; Bosch, R.; Vadell, J.; Cabot, C.; Gomila, M. Resumen: Grapevine (Vitis vinifera) is an economically crucial crop for agriculture, especially in Mediterranean regions. Xylella fastidiosa subsp. fastidiosa (Xff), a bacterium responsible for serious plant diseases as Pierce’s disease, poses a growing threat to viticulture. This study aims 1) to explore the diversity of culturable fungal endophytic communities present in the grapevine sap of naturally Xff-infected grapevines in the field and 2) to study the interaction between a pathogenic fungus identified in the xylem sap with Xff. Xylem sap was collected from vines of cv. Cabernet Sauvignon in a vineyard in Mallorca, Spain. The microbial communities were analyzed using traditional culture-depending techniques for fungal identification. Beneficial species identified included Aureobasidium pullulans and Rhodotorula mucilaginosa, which have antagonistic activities against fungal species associated with grapevine trunk diseases (GTDs). Nonetheless, the pathogenic fungi Sclerotinia sclerotiorum (Ss) and some members of the Dematiaceous taxonomic group like Phoma complex, Cladosporium sp, and Alternaria alternata were also identified. A similar diversity of fungal species was found in plants that tested negative and positive for the presence of Xff. Despite the small samples size used, these preliminary results suggest a potential complex interaction between Xff and the sap endophytic microbiome. In 28 addition, the interaction between Xff and Ss was further studied in grapewines artificially inoculated with Xff under controlled conditions. Interestingly, the results showed a synergistic effect, as Xff-inoculated grapevines were more vulnerable to Ss infection. This study provides novel insights into the fungal endophytic communities associated with Xff in grapevines-infected plants, and highlights some potential interactions among the bacteria and the sap microbiome components. During microbial interference, depending on the edaphoclimatic and crop managing conditions, while some of the identified mycobiota members could prove beneficial yielding plants more tolerant to Xff, others could be detrimental for grapevines as Xff could accelerate fungal diseases. 2025-01-01T00:00:00Z