Vòrtex òptics de polarització generats mitjançant una micropantalla de cristall líquid

La tecnologia actual de cristall líquid permet la fabricació de micropantallas (microdisplays) amb una grandària típica de 1 o 2 centimetres quadrats i amb resolucions en l'ordre de 1000x1000 píxels. Aquestes pantalles poden també emprar-se en el camp de l'òptica difractiva per a la generació de nous elements òptics programables. En concret, investigadors del Departament de Física de la UAB han col·laborat amb investigadors de les universitats Miguel Hernández d'Elx, de la de Buenos Aires (Argentina) i de La Frontera (Xile), en l'estudi d'un element difractiu de polarització simple que genera, en el plànol de difracció, una estructura periòdica de vòrtex de polarització, i que s'ha presentat en el nostre article.La tecnología actual de cristal líquido permite la fabricación de micropantallas (microdisplays) con un tamaño típico de 1 o 2 centímetros cuadrados y con resoluciones en el orden de 1000x1000 píxeles. Estas pantallas pueden también emplearse en el campo de la óptica difractiva para la generación de novedosos elementos ópticos programables. En concreto, investigadores del Departamento de Física de la UAB han colaborado con investigadores de las universidades Miguel Hernández de Elche, de la de Buenos Aires (Argentina) y de La Frontera (Chile) en el estudio de un elemento difractivo de polarización simple que genera, en el plano de difracción, una estructura periódica de vórtices de polarización, y que se ha presentado en nuestro artículo.Current liquid crystal technology allows the production of microdisplays (LCD, Liquid Crystal Displays), with a typical size of 1 or 2 square centimetres, and with resolutions in the order of 1000x1000 pixels. These displays can be used in the field of diffractive optics for the generation of novel programmable optical diffractive elements. Researchers from the UAB Department of Physics have collaborated with researchers from the University Miguel Hernández of Elche (Spain), University of Buenos Aires (Argentina) and University de La Frontera (Chile), in the study of a simple polarization diffractive element that , in the diffraction field, generates a periodic structure of polarization vortices

Vítreo primario hiperplásico persistente y anomalías asociadas en un Husky siberiano

Se describe el caso clínico de una perra Husky siberiano que acudio a consulta para una evaluacion ocular porque el ojo derecho mostraba aspecto blanquecino. El diagnostico de vitreo primario hiperplastico persistente se efectuo mediante ultrasonografia bidimensional y Doppler color

Enzymatic dynamic kinetic resolution of racemic N-formyl- and N-carbamoyl-amino acids using immobilized L-N-carbamoylase and N-succinyl-amino acid racemase.

Taking advantage of the catalytic promiscuity of L-carbamoylase from Geobacillus stearothermophilus CECT43 (BsLcar) and N-succinyl-amino acid racemase from Geobacillus kaustophilus CECT4264 (GkNSAAR), we have evaluated the production of different optically pure L-α-amino acids starting from different racemic N-formyl- and N-carbamoyl-amino acids using a dynamic kinetic resolution approach. The enzymes were immobilized on two different solid supports, resulting in improved stability of the enzymes in terms of thermostability and storage when compared to the enzymes in solution. The bienzymatic system retained up to 80 % conversion efficiency after 20 weeks at 4 °C and up to 90 % after 1 week at 45 °C. The immobilization process also resulted in a great enhancement of the activity of BsLcar toward N-formyl-tryptophan, showing for the first time that substrate specificity of L-carbamoylases can be influenced by this approach. The system was effective for the biosynthesis of natural and unnatural L-amino acids (enantiomeric excess (e.e.) >99.5 %), such as L-methionine, L-alanine, L-tryptophan, L-homophenylalanine, L-aminobutyric acid, and L-norleucine, with a higher performance toward N-formyl-α-amino acid substrates. Biocatalyst reuse was studied, and after 10 reaction cycles, over 75 % activity remained.post-print1047 K

Bloqueo atrioventricular completo en un perro : tratamiento mediante la implantación de un marcapasos endovenosos permanente

Una perra Labrador Retriever presentaba una historia de síncopes, fatiga e intolerancia al ejercicio debida a un bloqueo atrioventricular completo. Debido a que no respondía a la terapia médica (terbutalina, teofilina y posteriormente atropina), fue remitida al Hospital Clínico Veterinario de la Universidad de Murcia con el fin de considerar la implantación de un marcapasos. Las radiografías de tórax mostraron aumento global de la silueta cardiaca y la ecocardiografía puso de manifiesto, además, ligera regurgitación de válvulasatrioventriculares. Se le implantó un marcapasos endovenoso permanente unipolar con modo VVI bajo anestesia general, guiando el cable hacia el ventrículo derecho mediante fluoroscopia con amplificador de imagen. Ocho meses después de la implantación, no se han producido complicaciones y el marcapasos funciona según los parámetros programados.

Sustainable soil-compacted blocks containing blast furnace slag (BFS) activated with olive stone biomass ash (OBA)

[EN] Soil stabilization using cementing materials is a well-known procedure for earth-based building blocks preparation. For the selected binding materials, innovation usually focuses on low carbon systems, many of which are based on alkaline activation. In the present paper, blast furnace slag (BFS) is used as a mineral precursor, and the innovative alkali activator was olive stone biomass ash (OBA). This means that the most important component in CO2 emissions terms, which is the alkali activator, has been replaced with a greener alternative: OBA. The OBA/BFS mixture was used to prepare compacted dolomitic soil blocks. These specimens were mechanically characterized by compression, and water strength coefficient and water absorption were assessed. The microstructure of blocks and the formation of cementing hydrates were analyzed by field emission scanning electron microscopy and thermogravimetry, respectively. The final compressive strength of the 120-day cured blocks was 27.8 MPa. It was concluded that OBA is a sustainable alkali activator alternative for producing BFS-stabilized soil-compacted blocks: CO2 emissions were 3.3 kgCO(2)/ton of stabilized soil, which is 96% less than that for ordinary Portland cement (OPC) stabilization.This research was funded by the Spanish Government and FEDER funds (MINECO/FEDER-Project RTI2018-09612-B-C21).Paya Bernabeu, JJ.; Monzó Balbuena, JM.; Rosello Caselles, J.; Borrachero Rosado, MV.; Font-Pérez, A.; Soriano Martinez, L. (2020). Sustainable soil-compacted blocks containing blast furnace slag (BFS) activated with olive stone biomass ash (OBA). Sustainability. 12(23):1-14. https://doi.org/10.3390/su12239824S1141223Van Damme, H., & Houben, H. (2018). Earth concrete. Stabilization revisited. Cement and Concrete Research, 114, 90-102. doi:10.1016/j.cemconres.2017.02.035Menchaca-Ballinas, L. E., & Escalante-Garcia, J. I. (2019). Low CO2 emission cements of waste glass activated by CaO and NaOH. Journal of Cleaner Production, 239, 117992. doi:10.1016/j.jclepro.2019.117992Basha, E. A., Hashim, R., Mahmud, H. B., & Muntohar, A. S. (2005). Stabilization of residual soil with rice husk ash and cement. Construction and Building Materials, 19(6), 448-453. doi:10.1016/j.conbuildmat.2004.08.001Rahgozar, M. A., Saberian, M., & Li, J. (2018). Soil stabilization with non-conventional eco-friendly agricultural waste materials: An experimental study. Transportation Geotechnics, 14, 52-60. doi:10.1016/j.trgeo.2017.09.004Sisol, M., Kudelas, D., Marcin, M., Holub, T., & Varga, P. (2019). Statistical Evaluation of Mechanical Properties of Slag Based Alkali-Activated Material. Sustainability, 11(21), 5935. doi:10.3390/su11215935Mellado, A., Catalán, C., Bouzón, N., Borrachero, M. V., Monzó, J. M., & Payá, J. (2014). Carbon footprint of geopolymeric mortar: study of the contribution of the alkaline activating solution and assessment of an alternative route. RSC Adv., 4(45), 23846-23852. doi:10.1039/c4ra03375bTchakouté, H. K., Rüscher, C. H., Kong, S., & Ranjbar, N. (2016). Synthesis of sodium waterglass from white rice husk ash as an activator to produce metakaolin-based geopolymer cements. Journal of Building Engineering, 6, 252-261. doi:10.1016/j.jobe.2016.04.007Tchakouté, H. K., Rüscher, C. H., Hinsch, M., Djobo, J. N. Y., Kamseu, E., & Leonelli, C. (2017). Utilization of sodium waterglass from sugar cane bagasse ash as a new alternative hardener for producing metakaolin-based geopolymer cement. Geochemistry, 77(2), 257-266. doi:10.1016/j.chemer.2017.04.003Moraes, J. C. B., Font, A., Soriano, L., Akasaki, J. L., Tashima, M. M., Monzó, J., … Payá, J. (2018). New use of sugar cane straw ash in alkali-activated materials: A silica source for the preparation of the alkaline activator. Construction and Building Materials, 171, 611-621. doi:10.1016/j.conbuildmat.2018.03.230Font, A., Soriano, L., Reig, L., Tashima, M. M., Borrachero, M. V., Monzó, J., & Payá, J. (2018). Use of residual diatomaceous earth as a silica source in geopolymer production. Materials Letters, 223, 10-13. doi:10.1016/j.matlet.2018.04.010Samarakoon, M. H., Ranjith, P. G., Duan, W. H., & De Silva, V. R. S. (2020). Properties of one-part fly ash/slag-based binders activated by thermally-treated waste glass/NaOH blends: A comparative study. Cement and Concrete Composites, 112, 103679. doi:10.1016/j.cemconcomp.2020.103679Zhao, X., Liu, C., Wang, L., Zuo, L., Zhu, Q., & Ma, W. (2019). Physical and mechanical properties and micro characteristics of fly ash-based geopolymers incorporating soda residue. Cement and Concrete Composites, 98, 125-136. doi:10.1016/j.cemconcomp.2019.02.009Bilginer, A., Canbek, O., & Turhan Erdoğan, S. (2020). Activation of Blast Furnace Slag with Soda Production Waste. Journal of Materials in Civil Engineering, 32(1), 04019316. doi:10.1061/(asce)mt.1943-5533.0002987Ban, C. C., Ken, P. W., & Ramli, M. (2017). Mechanical and Durability Performance of Novel Self-activating Geopolymer Mortars. Procedia Engineering, 171, 564-571. doi:10.1016/j.proeng.2017.01.374Peys, A., Rahier, H., & Pontikes, Y. (2016). Potassium-rich biomass ashes as activators in metakaolin-based inorganic polymers. Applied Clay Science, 119, 401-409. doi:10.1016/j.clay.2015.11.003Soriano, L., Font, A., Tashima, M. M., Monzó, J., Borrachero, M. V., & Payá, J. (2020). One-part blast furnace slag mortars activated with almond-shell biomass ash: A new 100% waste-based material. Materials Letters, 272, 127882. doi:10.1016/j.matlet.2020.127882Abdullah, H. H., Shahin, M. A., & Walske, M. L. (2020). Review of Fly-Ash-Based Geopolymers for Soil Stabilisation with Special Reference to Clay. Geosciences, 10(7), 249. doi:10.3390/geosciences10070249Cristelo, N., Miranda, T., Oliveira, D. V., Rosa, I., Soares, E., Coelho, P., & Fernandes, L. (2015). Assessing the production of jet mix columns using alkali activated waste based on mechanical and financial performance and CO2 (eq) emissions. Journal of Cleaner Production, 102, 447-460. doi:10.1016/j.jclepro.2015.04.102Font, A., Soriano, L., Moraes, J. C. B., Tashima, M. M., Monzó, J., Borrachero, M. V., & Payá, J. (2017). A 100% waste-based alkali-activated material by using olive-stone biomass ash (OBA) and blast furnace slag (BFS). Materials Letters, 203, 46-49. doi:10.1016/j.matlet.2017.05.129De Moraes Pinheiro, S. M., Font, A., Soriano, L., Tashima, M. M., Monzó, J., Borrachero, M. V., & Payá, J. (2018). Olive-stone biomass ash (OBA): An alternative alkaline source for the blast furnace slag activation. Construction and Building Materials, 178, 327-338. doi:10.1016/j.conbuildmat.2018.05.157Alonso, M. M., Gascó, C., Morales, M. M., Suárez-Navarro, J. A., Zamorano, M., & Puertas, F. (2019). Olive biomass ash as an alternative activator in geopolymer formation: A study of strength, radiology and leaching behaviour. Cement and Concrete Composites, 104, 103384. doi:10.1016/j.cemconcomp.2019.103384Vossen, P. (2007). Olive Oil: History, Production, and Characteristics of the World’s Classic Oils. HortScience, 42(5), 1093-1100. doi:10.21273/hortsci.42.5.1093Roig, A., Cayuela, M. L., & Sánchez-Monedero, M. A. (2006). An overview on olive mill wastes and their valorisation methods. Waste Management, 26(9), 960-969. doi:10.1016/j.wasman.2005.07.024García Martín, J. F., Cuevas, M., Feng, C.-H., Álvarez Mateos, P., Torres García, M., & Sánchez, S. (2020). Energetic Valorisation of Olive Biomass: Olive-Tree Pruning, Olive Stones and Pomaces. Processes, 8(5), 511. doi:10.3390/pr8050511Cosa, J., Soriano, L., Borrachero, M. V., Payá, J., & Monzó, J. M. (2019). Stabilization of soil by means alternative alkali‐activated cement prepared with spent FCC catalyst. International Journal of Applied Ceramic Technology, 17(1), 190-196. doi:10.1111/ijac.13377Xing, J., Zhao, Y., Qiu, J., & Sun, X. (2019). Microstructural and Mechanical Properties of Alkali Activated Materials from Two Types of Blast Furnace Slags. Materials, 12(13), 2089. doi:10.3390/ma12132089Burciaga-Díaz, O., & Escalante-García, J. I. (2013). Structure, Mechanisms of Reaction, and Strength of an Alkali-Activated Blast-Furnace Slag. Journal of the American Ceramic Society, 96(12), 3939-3948. doi:10.1111/jace.12620Gunasekaran, S., & Anbalagan, G. (2007). Thermal decomposition of natural dolomite. Bulletin of Materials Science, 30(4), 339-344. doi:10.1007/s12034-007-0056-zWalkley, B., San Nicolas, R., Sani, M.-A., Rees, G. J., Hanna, J. V., van Deventer, J. S. J., & Provis, J. L. (2016). Phase evolution of C-(N)-A-S-H/N-A-S-H gel blends investigated via alkali-activation of synthetic calcium aluminosilicate precursors. Cement and Concrete Research, 89, 120-135. doi:10.1016/j.cemconres.2016.08.010Puertas, F., Palacios, M., Manzano, H., Dolado, J. S., Rico, A., & Rodríguez, J. (2011). A model for the C-A-S-H gel formed in alkali-activated slag cements. Journal of the European Ceramic Society, 31(12), 2043-2056. doi:10.1016/j.jeurceramsoc.2011.04.036Ortega-Zavala, D. E., Santana-Carrillo, J. L., Burciaga-Díaz, O., & Escalante-García, J. I. (2019). An initial study on alkali activated limestone binders. Cement and Concrete Research, 120, 267-278. doi:10.1016/j.cemconres.2019.04.002Guettala, A., Abibsi, A., & Houari, H. (2006). Durability study of stabilized earth concrete under both laboratory and climatic conditions exposure. Construction and Building Materials, 20(3), 119-127. doi:10.1016/j.conbuildmat.2005.02.001Salim, R., Ndambuki, J., & Adedokun, D. (2014). Improving the Bearing Strength of Sandy Loam Soil Compressed Earth Block Bricks Using Sugercane Bagasse Ash. Sustainability, 6(6), 3686-3696. doi:10.3390/su6063686Font, A., Soriano, L., Tashima, M. M., Monzó, J., Borrachero, M. V., & Payá, J. (2020). One-part eco-cellular concrete for the precast industry: Functional features and life cycle assessment. Journal of Cleaner Production, 269, 122203. doi:10.1016/j.jclepro.2020.122203Luukkonen, T., Abdollahnejad, Z., Yliniemi, J., Kinnunen, P., & Illikainen, M. (2018). One-part alkali-activated materials: A review. Cement and Concrete Research, 103, 21-34. doi:10.1016/j.cemconres.2017.10.00

Biochemical and Mutational Characterization of N-Succinyl-Amino Acid Racemase from Geobacillus stearothermophilus CECT49.

N-Succinyl-amino acid racemase (NSAAR), long referred to as N-acyl- or N-acetyl-amino acid racemase, is an enolase superfamily member whose biotechnological potential was discovered decades ago, due to its use in the industrial dynamic kinetic resolution methodology first known as “Acylase Process”. In previous works, an extended and enhanced substrate spectrum of the NSAAR from Geobacillus kaustophilus CECT4264 toward different N-substituted amino acids was reported. In this work, we describe the cloning, purification, and characterization of the NSAAR from Geobacillus stearothermophilus CECT49 (GstNSAAR). The enzyme has been extensively characterized, showing a higher preference toward N-formyl-amino acids than to N-acetyl-amino acids, thus confirming that the use of the former substrates is more appropriate for a biotechnological application of the enzyme. The enzyme showed an apparent thermal denaturation midpoint of 77.0 ± 0.1 °C and an apparent molecular mass of 184 ± 5 kDa, suggesting a tetrameric species. Optimal parameters for the enzyme activity were pH 8.0 and 55–65 °C, with Co2+ as the most effective cofactor. Mutagenesis and binding experiments confirmed K166, D191, E216, D241, and K265 as key residues in the activity of GstNSAAR, but not indispensable for substrate binding.pre-print784 K

App yo embarazo, una nueva forma de facilitar información a la gestante y su pareja

Comunicación oral presentada en el 3er Congreso Internacional de Comunicación en Salud (3ICHC), celebrado los días 19 y 20 de octubre de 2017 en la Universidad Carlos III de Madrid.Los objetivos son mejorar los conocimientos y destrezas del cuidado de las gestantes, sus parejas y sus futuros recién nacidos, ofreciendo una información veraz, detallada y personalizada a las embarazadas y sus pareja

Empty Spain and vernacular architecture. Awareness and conservation from the teaching of architectural restoration

[EN] The First Industrial Revolution brought about the attraction to the cities of much labor force coming from the countryside. In Spain, this migratory phenomenon accelerated during the period of development of the 1960s. Today, even it seems not to have reached bottom: there are already many deserted areas in the so called "empty Spain" and more the nuclei that will disappear in the coming years if nothing remedies. This territorial imbalance has led, on the one hand, to the pollution and overpopulation of large metropolitan areas, often located on the coast, and on the other, to the progressive extinction of an ancestral way of life that has been maintaining a tight balance with the natural environment through agricultural exploitation. It is in this context that the Empty Spain teaching initiative arises, applicable to several subjects of the degree in Fundamentals of Architecture taught at the ETS of Architecture (Universitat Politècnica de València, Spain), and encouraged by the Sustainable Development Goals of the 2030 Agenda promoted by United Nations, especially with regard to No. 10 ¿Reduce inequality¿, No. 11 ¿Sustainable cities and communities", and No. 12: "Responsible production and consumption". A team of professors with a long teaching and research career linked to the course on Architectural Restoration promotes this idea. The experience was developed in two phases: learning and dissemination. In order to undertake the learning phase, a triple challenge was proposed: raising awareness of the seriousness of the problem and the urgency of finding viable solutions; fostering knowledge of vernacular architecture, predominant in the affected area; and acting through an incipient architectural project applied to a traditional building. In short, knowing vernacular architecture and learning from it. For its part, the dissemination phase is being deployed in parallel through several channels. A temporary exhibition is organized with a selection of the most suggestive works aimed at the students and teachers of the School. This strategy is joined by participation in two international congresses, one on research and the other on teaching.Baró Zarzo, JL.; Cristini, V.; Mileto, C.; Balaguer Dezcallar, MJ.; De Dato, P.; García-Soriano, L.; Lidón De-Miguel, M.... (2022). Empty Spain and vernacular architecture. Awareness and conservation from the teaching of architectural restoration. IATED. 7203-7208. https://doi.org/10.21125/edulearn.2022.16857203720