Validation of potentiometric method to determine the degree of deacetylation of chitosan

Un método potenciométrico para la determinación del grado de desacetilación de muestras de quitosanas derivadas de quitina de langosta se validó según las exigencias internacionales actuales. Para garantizar que ocurriera la reacción completa entre el analito y la disolución de HCl se aplicó calentamiento de las muestras a temperatura inferior a 60ºC. Auxiliarmente a los cambios de pH, para la detección del primer punto de infl exión, se utilizó el anaranjado de metilo como indicador visual cuyo intervalo de transición está en un rango estrecho de pH ácido, entre 2 a 4. No se registraron interferencias desde el punto de vista analítico en la zona de interés de la curva potenciométrica en ausencia del analito, por lo que el método fue selectivo. Se demostró que el método fue lineal en el rango de 10.0 a 15.0 mg/mL, además fue preciso y exacto para la determinación del porcentaje de grupos aminos libres.The purpose of this study was to validate, in accordance with international standards, a potentiometric method to determine the degree of deacetylation of chitosan samples derived from lobster chitin. To ensure a complete reaction between the analyte and the HCl solution, the samples were heated to temperatures of up to 60ºC. The change in pH and the methyl orange method, as a visual indicator were used to detect the fi rst infl ection point. The transition interval fell within the narrow pH acid range of 2 to 4. From an analytical point of view, no interference was observed on the potentiometric curve in the absence of the analyte, thus showing that the method was suffi ciently selective. For the determination of the percentage of free amino groups, the method proved to be linear within the 10.0 to 15.0 mg/mL range, as well as precise and exact

Finding influential nodes for integration in brain networks using optimal percolation theory

Global integration of information in the brain results from complex interactions of segregated brain networks. Identifying the most influential neuronal populations that efficiently bind these networks is a fundamental problem of systems neuroscience. Here we apply optimal percolation theory and pharmacogenetic interventions in-vivo to predict and subsequently target nodes that are essential for global integration of a memory network in rodents. The theory predicts that integration in the memory network is mediated by a set of low-degree nodes located in the nucleus accumbens. This result is confirmed with pharmacogenetic inactivation of the nucleus accumbens, which eliminates the formation of the memory network, while inactivations of other brain areas leave the network intact. Thus, optimal percolation theory predicts essential nodes in brain networks. This could be used to identify targets of interventions to modulate brain function.Comment: 20 pages, 6 figures, Supplementary Inf

Low prostaglandin E2 and cyclooxygenase expression in nasal mucosa fibroblasts of aspirin-intolerant asthmatics.

Background and objective: Anomalies in the regulation of cyclooxygenase (COX)-1 and-2 have been described in nasal polyps of aspirin-induced asthma (AIA). Whether these anomalies are specific to nasal polyps or affect all the nasal mucosa (NM) of upper airways is still unclear. The objective of this study was to compare the COX pathway in NM of AIA patients with the NM of control subjects. Methods: Fibroblasts were isolated from NM of 5 AIA patients (AIA-NM) and 5 control subjects (control-NM). Cells were treated with 10 ng/ml IL-1b for up to 72 hours. Prostaglandin E2 (PGE2) production was measured by ELISA, expression of COX-1 protein by Western blot, and COX-2 protein by ELISA, Western blot and immunofluorescence techniques. Results: IL-1b increased PGE2 production and COX-1 protein expression in control-NM fibroblasts, but no changes were found in AIA-NM. IL-1b provoked a significant timedependent increase in COX-2 protein expression in control-NM fibroblasts but had a very mild effect on COX-2 protein expression in AIA-NM. Conclusions: Our data suggest that abnormalities in the COX pathway are not a phenomenon exclusive to nasal polyp mucosa as they are also present in all the nasal mucosa of AIA patients. These anomalies may be involved in the pathogenesis of airway inflammation and NSAID intolerance in asthma patients with chronic rhinosinusitis and nasal polyposis

Theoretical analysis of the focusing of acoustic waves by two-dimensional sonic crystals

Motivated by a recent experiment on acoustic lenses, we perform numerical calculations based on a multiple scattering technique to investigate the focusing of acoustic waves with sonic crystals formed by rigid cylinders in air. The focusing effects for crystals of various shapes are examined. The dependance of the focusing length on the filling factor is also studied. It is observed that both the shape and filling factor play a crucial role in controlling the focusing. Furthermore, the robustness of the focusing against disorders is studied. The results show that the sensitivity of the focusing behavior depends on the strength of positional disorders. The theoretical results compare favorably with the experimental observations, reported by Cervera, et al. (Phys. Rev. Lett. 88, 023902 (2002)).Comment: 8 figure

Protective role of mindfulness, self-compassion and psychological flexibility on the burnout subtypes among psychology and nursing undergraduate students

Aims: To explore the relationship between mindfulness, self-compassion and psychological flexibility, and the burnout subtypes in university students of the Psychology and Nursing degrees, and to analyse possible risk factors for developing burnout among socio-demographic and studies-related characteristics. Design: Cross-sectional study conducted on a sample of 644 undergraduate students of Nursing and Psychology from two Spanish universities. Methods: The study was conducted between December 2015 and May 2016. Bivariate Pearson''s correlations were computed to analyse the association between mindfulness facets, self-compassion and psychological flexibility, and levels of burnout. Multivariate linear regression models and bivariate and multivariate binary logistic regressions were also computed. Results: The three subtypes of burnout presented significant correlations with psychological flexibility, self-compassion and some mindfulness facets. Psychological flexibility, self-compassion and the mindfulness facets of observing and acting with awareness were significantly associated to burnout. Among the risk factors, ‘year of study’ was the only variable to show significantly higher risk for every burnout subtype. Conclusion: The significant associations found between mindfulness, self-compassion, psychological flexibility and burnout levels underline the need of including these variables as therapeutic targets when addressing the burnout syndrome in university students. Impact. Undergraduate students, especially those of health sciences, often experience burnout. This study delves into the protective role of some psychological variables: mindfulness, self-compassion and psychological flexibility. These should be considered as potentially protective skills for developing burnout, and therefore, undergraduate students could be trained on these abilities to face their studies and their future profession to prevent experiencing burnout syndrome. © 2021 John Wiley & Sons Lt

Effect of different housing systems (single and group penning) on the health and welfare of commercial female rabbits

[EN] In recent decades, concern about rabbit welfare and sustainability has increased. The housing system is a very important factor for animal welfare. However, information about how different available housing types for female rabbits affect their health status is scarce, but this is an important factor for their welfare. Hence, the objective of this study was to evaluate the health status of female rabbits in five common housing systems: three different single-housing systems with distinct available surfaces and heights; a single-housing system with a platform; a collective system. Female rabbits in the collective and platform cages had greater cortisol concentrations in hair than those in the single-housing system with no platform. Haptoglobin concentrations and kit mortality rates during lactation were greater for the collective-cage female rabbits. The collective group had more culled females and more lesions than in the other groups. The main reasons for culling in all the groups were reproduction problems and presence of abscesses, and the collective group of females was the most affected. In conclusion, it appears that keeping females together in collective systems negatively affects their health status and welfare, while single-housing systems imply lower kit mortality rates during lactation and cortisol concentrations, and fewer lesions in female rabbits.This study was supported by the INIA-INTERCUN Project (CUN2014-00001-00-00) and by Universidad CEU-Cardenal Herrera (INDI16/07, INDI17/07, INDI18/08). Grants for Sara Perez Fuentes, Asuncion Munoz Silvestre and Elena Moreno Grua from Universidad CEU-Cardenal Herrera, and also for Sara Perez Fuentes from Generalitat Valenciana and FSE (ACIF/2016/085), and for Elena Moreno Grua from Ministerio de Educacion, Cultura y Deporte (FPU17/02708) are also gratefully acknowledged.Pérez-Fuentes, S.; Muñoz-Silvestre, A.; Moreno Grua, E.; Martinez-Paredes, E.; Viana, D.; Selva, L.; Villagrá, A.... (2020). Effect of different housing systems (single and group penning) on the health and welfare of commercial female rabbits. Animal. 14(6):1270-1277. https://doi.org/10.1017/S1751731119003379S12701277146Archetti I, Tittarelli C, Cerioli M, Brivio R, Grilli G and Lavazza A 2008. Serum chemistry and hematology values in commercial rabbits: preliminary data from industrial farms in northern Italy. In Proceedings of the 9th World Rabbit Congress, 10–13 June 2008, Verone, Italy, pp. 1147–1152.Argente, M.-J., García, M. de la L., Birlanga, V., & Muelas, R. (2014). Relationship between cortisol and acute phase protein concentrations in female rabbits. The Veterinary Journal, 202(1), 172-175. doi:10.1016/j.tvjl.2014.07.020Cervera C, Martínez-Paredes E, Machado L and Villagrá A 2017. Producción de conejas en sistemas de alojamiento individual o colectivo en semigrupo. In Proceedings of the XLII Symposium de Cunicultura de ASESCU, 11–12 May 2017, Murcia, Spain, pp. 107–110.Dal Bosco, A., Mugnai, C., Martino, M., Szendrő, Z., Mattioli, S., Cambiotti, V., … Castellini, C. (2019). Housing Rabbit Does in a Combi System with Removable Walls: Effect on Behaviour and Reproductive Performance. Animals, 9(8), 528. doi:10.3390/ani9080528Dalle Zotte, A., Princz, Z., Matics, Z., Gerencsér, Z., Metzger, S., & Szendrő, Z. (2009). Rabbit preference for cages and pens with or without mirrors. Applied Animal Behaviour Science, 116(2-4), 273-278. doi:10.1016/j.applanim.2008.08.011Machado L, Cervera C, Martínez-Paredes E, Paragliola F and Cano C 2016. Comportamiento y manejo de conejas en sistemas de cría colectiva. In Proceedings of the XLI Symposium de Cunicultura de ASESCU, 12–13 May 2016, Hondarribia, Spain, pp. 134–137.Maertens L and Buijs S 2016. Impact of housing system (cage vs. part-time housing) and floor type on rabbit doe welfare. In Proceedings of the 11th World Rabbit Congress, 15–18 June 2016, Qingdao, China, pp. 707–710.Marai, I. F. ., Habeeb, A. A. ., & Gad, A. . (2002). Rabbits’ productive, reproductive and physiological performance traits as affected by heat stress: a review. Livestock Production Science, 78(2), 71-90. doi:10.1016/s0301-6226(02)00091-xMarcato PS and Rosmini R 1986. Mammary glands. In Pathology of the rabbit and hare (eds. PS Marcato and R Rosmini ), pp. 179–186. Società Editrice Esculapio, Bologna, Italy.Masthoff, T., & Hoy, S. (2019). Investigations on the Influence of Floor Design on Dirtiness and Foot Pad Lesions in Growing Rabbits. Animals, 9(6), 354. doi:10.3390/ani9060354Mugnai, C., Dal Bosco, A., & Castellini, C. (2009). Effect of different rearing systems and pre-kindling handling on behaviour and performance of rabbit does. Applied Animal Behaviour Science, 118(1-2), 91-100. doi:10.1016/j.applanim.2009.02.007Petersen, H. H., Nielsen, J. P., & Heegaard, P. M. H. (2004). Application of acute phase protein measurements in veterinary clinical chemistry. Veterinary Research, 35(2), 163-187. doi:10.1051/vetres:2004002Rödel, H. G., Starkloff, A., Bautista, A., Friedrich, A.-C., & Von Holst, D. (2008). Infanticide and Maternal Offspring Defence in European Rabbits under Natural Breeding Conditions. Ethology, 114(1), 22-31. doi:10.1111/j.1439-0310.2007.01447.xRödel, H. G., Starkloff, A., Seltmann, M. W., Prager, G., & von Holst, D. (2009). Causes and predictors of nest mortality in a European rabbit population. Mammalian Biology, 74(3), 198-209. doi:10.1016/j.mambio.2008.04.003Rommers, J. M., Boiti, C., De Jong, I., & Brecchia, G. (2006). Performance and behaviour of rabbit does in a group-housing system with natural mating or artificial insemination. Reproduction Nutrition Development, 46(6), 677-687. doi:10.1051/rnd:2006038Rommers, J., & De Greef, K. H. (2018). Are combi parks just as useful as regular parks for fatteners for part-time group housing of rabbit does? World Rabbit Science, 26(4), 299. doi:10.4995/wrs.2018.9587Rosell J and De La Fuente L 2008. Health and body condition of rabbit does on commercial farms. In Proceedings of the 9th World Rabbit Congress, 10–13 June 2008, Verone, Italy, pp. 1065–1069.Rosell, J., & de la Fuente, L. (2013). Assessing Ulcerative Pododermatitis of Breeding Rabbits. Animals, 3(2), 318-326. doi:10.3390/ani3020318Sánchez, J. P., de la Fuente, L. F., & Rosell, J. M. (2012). Health and body condition of lactating females on rabbit farms1. Journal of Animal Science, 90(7), 2353-2361. doi:10.2527/jas.2011-4065Segura, P., Martinez, J., Peris, B., Selva, L., Viana, D., Penades, J. R., & Corpa, J. M. (2007). Staphylococcal infections in rabbit does on two industrial farms. Veterinary Record, 160(25), 869-872. doi:10.1136/vr.160.25.869Siemsen DW, Malachowa N, Schepetkin IA, Whitney AR, Kirpotina LN, Lei B, DeLeo FR and Quinn MT 2014. Neutrophil isolation from nonhuman species. In Neutrophil methods and protocols (eds. MT Quinn and FR De Leo ), pp. 19–37. Humana Press, Totowa, NJ, USASzendrő, Z., & McNitt, J. I. (2012). Housing of rabbit does: Group and individual systems: A review. Livestock Science, 150(1-3), 1-10. doi:10.1016/j.livsci.2012.09.017Szendrő, Z., Mikó, A., Odermatt, M., Gerencsér, Z., Radnai, I., Dezséry, B., … Matics, Z. (2013). Comparison of performance and welfare of single-caged and group-housed rabbit does. 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Finding influential nodes for integration in brain networks using optimal percolation theory

Global integration of information in the brain results from complex interactions of segregated brain networks. Identifying the most influential neuronal populations that efficiently bind these networks is a fundamental problem of systems neuroscience. Here, we apply optimal percolation theory and pharmacogenetic interventions in vivo to predict and subsequently target nodes that are essential for global integration of a memory network in rodents. The theory predicts that integration in the memory network is mediated by a set of low-degree nodes located in the nucleus accumbens. This result is confirmed with pharmacogenetic inactivation of the nucleus accumbens, which eliminates the formation of the memory network, while inactivations of other brain areas leave the network intact. Thus, optimal percolation theory predicts essential nodes in brain networks. This could be used to identify targets of interventions to modulate brain function

Radon and material radiopurity assessment for the NEXT double beta decay experiment

The Neutrino Experiment with a Xenon TPC (NEXT), intended to investigate the neutrinoless double beta decay using a high-pressure xenon gas TPC filled with Xe enriched in 136Xe at the Canfranc Underground Laboratory in Spain, requires ultra-low background conditions demanding an exhaustive control of material radiopurity and environmental radon levels. An extensive material screening process is underway for several years based mainly on gamma-ray spectroscopy using ultra-low background germanium detectors in Canfranc but also on mass spectrometry techniques like GDMS and ICPMS. Components from shielding, pressure vessel, electroluminescence and high voltage elements and energy and tracking readout planes have been analyzed, helping in the final design of the experiment and in the construction of the background model. The latest measurements carried out will be presented and the implication on NEXT of their results will be discussed. The commissioning of the NEW detector, as a first step towards NEXT, has started in Canfranc; in-situ measurements of airborne radon levels were taken there to optimize the system for radon mitigation and will be shown too.Comment: Proceedings of the Low Radioactivity Techniques 2015 workshop (LRT2015), Seattle, March 201

Impact of subtrochanteric fractures in the geriatric population : better pre-fracture condition but poorer outcome than pertrochanteric fractures: evidence from the Spanish Hip Fracture Registry

Clinical management in orthogeriatric units and outcome indicators are similar for extracapsular fragility hip fractures, without discriminating between subtrochanteric and pertrochanteric fractures. Geriatric patients, 75 years or older, with subtrochanteric fractures have worse clinical and functional outcomes than those with pertrochanteric fractures. Retrospective observational study of data prospectively collected by the Spanish Hip Fracture Registry including patients 75 years or older, admitted for extracapsular hip fractures from January 2017 to June 2019. Demographic and baseline status, pre-operative, post-operative and 30-day follow-up data were included. A total of 13,939 patients with extracapsular hip fractures were registered: 12,199 (87.5%) pertrochanteric and 1740 (12.5%) subtrochanteric. At admission, patients with subtrochanteric fractures were younger (86.5 ± 5.8 versus 87.1 ± 5.6 years old), had better pre-fracture mobility (3.7 ± 2.7 versus 3.9 ± 2.8) (1-to-10 scale, 1 being independent) and were more likely to be living at home; those with pertrochanteric fractures had worse cognitive function (Pfeiffer 3.3 ± 3.3 versus 3.8 ± 3.5). The subtrochanteric fracture group showed worse post-fracture mobility (7.3 ± 2.7 versus 6.7 ± 2.7) and greater deterioration of mobility (3.7 ± 3.0 versus 2.9 ± 2.7). Among individuals living at home at baseline, those with subtrochanteric fractures were more likely to remain in an assisted facility at 30-day follow-up. In-hospital mortality during acute admission was higher for the subtrochanteric group (5.6% versus 4.5%) (p = 0.028). To our knowledge, this is the first paper highlighting the differences between these two fracture groups in the geriatric population. Subtrochanteric fractures in the older population are a different and worse entity, with greater morbimortality and functional decline than pertrochanteric fractures. Despite being younger and fitter at admission, older patients with subtrochanteric fractures have a higher risk of remaining non-weight bearing and undergoing re-operation and institutionalization. Orthogeriatric units should be aware of this and manage subtrochanteric fractures accordingly. Level of evidence: IV. The online version contains supplementary material available at 10.1186/s10195-022-00637-8