Dos años de estudios aerobiológicos en Vélez-Málaga (sur de España): periodo Febrero-Junio

XV lnternational A.P.L.E. Symposium of Palynolog

Multi-dimensional filtering: Reducing the dimension through rotation

Over the past few decades there has been a strong effort towards the development of Smoothness-Increasing Accuracy-Conserving (SIAC) filters for Discontinuous Galerkin (DG) methods, designed to increase the smoothness and improve the convergence rate of the DG solution through this post-processor. These advantages can be exploited during flow visualization, for example by applying the SIAC filter to the DG data before streamline computations [Steffan et al., IEEE-TVCG 14(3): 680-692]. However, introducing these filters in engineering applications can be challenging since a tensor product filter grows in support size as the field dimension increases, becoming computationally expensive. As an alternative, [Walfisch et al., JOMP 38(2);164-184] proposed a univariate filter implemented along the streamline curves. Until now, this technique remained a numerical experiment. In this paper we introduce the line SIAC filter and explore how the orientation, structure and filter size affect the order of accuracy and global errors. We present theoretical error estimates showing how line filtering preserves the properties of traditional tensor product filtering, including smoothness and improvement in the convergence rate. Furthermore, numerical experiments are included, exhibiting how these filters achieve the same accuracy at significantly lower computational costs, becoming an attractive tool for the scientific visualization community

A closer look into two-step perovskite conversion with X-ray scattering

Recently, hybrid perovskites have gathered much interest as alternative materials for the fabrication of highly efficient and cost-competitive solar cells; however, many questions regarding perovskite crystal formation and deposition methods remain. Here we have applied a two-step protocol where a crystalline PbI2 precursor film is converted to MAPbI3–xClx perovskite upon immersion in a mixed solution of methylammonium iodide and methylammonium chloride. We have investigated both films with grazing incidence small-angle X-ray scattering to probe the inner film morphology. Our results demonstrate a strong link between lateral crystal sizes in the films before and after conversion, which we attribute to laterally confined crystal growth. Additionally, we observe an accumulation of smaller grains within the bulk in contrast with the surface. Thus, our results help to elucidate the crystallization process of perovskite films deposited via a two-step technique that is crucial for controlled film formation, improved reproducibility, and high photovoltaic performance

Implementación del levantamiento eficiente de fachadas mediante fotogrametría digital automatizada y el uso de software gratuito

The survey of facades is a defendant process in several areas like architectural design and planning. The photogrammetry provides high geometric accuracy and but allows us to see the texture of the object. With the emergence of free software in this area, it turns into one of the most accessible techniques. To demonstrate the potential of this technique, we present here three examples of facade surveys of different types, made with this technique and using free software, using for that an uncalibrated conventional camera. It also includes a study that shows an analysis of the accuracy achievable with this process, and a direct comparison with two conventional surveying instruments. The work shows, therefore, as close-range photogrammetry allows a cheaper and quick, accurate and efficient survey of facades.El levantamiento de fachadas es un proceso demandado en multitud de ámbitos como la planificación arquitectónica y el planeamiento. La fotogrametría ofrece gran precisión geométrica y nos permite visualizar la textura del objeto en cuestión. Con la aparición de software gratuito en este ámbito, ésta se convierte en una de las técnicas más asequibles. Para demostrar las posibilidades de esta metodología, se presentan aquí tres ejemplos de levantamientos de fachadas de distinta tipología, realizados con fotogrametría y mediante la utilización del software gratuito, utilizando para ello una cámara convencional sin calibrar. Además se incluye un estudio en el que se muestra un análisis de la precisión alcanzable con este proceso, y una comparación directa con dos instrumentos topográficos convencionales. El trabajo realizado muestra, por tanto, como la fotogrametría de objeto cercano posibilita el levantamiento de fachadas a un bajo coste y de una forma ágil, precisa y eficiente

Aryloxyethyl thiocyanates are potent growth inhibitors of Trypanosoma cruzi and Toxoplasma gondii

As a part of our project aimed at searching new safe chemotherapeutic agents against parasitic diseases, several compounds structurally related to the antiparasitic agent WC-9 (4-phenoxyphenoxyethyl thiocyanate), which were modified at the terminal phenyl ring, were designed, synthesized and evaluated as growth inhibitors against Trypanosoma cruzi, the etiological agent of Chagas disease and Toxoplasma gondii, the parasite responsible of toxoplasmosis. Most of the synthetic analogues exhibited similar antiparasitic activity being slightly more potent than our lead WC-9. For example, the trifluoromethyl derivatives 15 and 16 exhibited ED50 values of 10.0 uM and 9.2 uM, respectively, against intracellular T. cruzi, whereas they showed potent action against tachyzoites of T. gondii (ED50 values 1.6 uM and 1.9 uM against T. gondii, respectively). In addition, the WC-9 analogues 48 and 61, in which the terminal aryl group was meta with respect to the alkyl chain bearing the thiocyanate group, showed potent inhibitory action against both T. cruzi and T. gondii at the very low micromolar range suggesting that para-phenyl substitution pattern is not necessarily required for biological activity.Fil: Chao, Maria Noelia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; ArgentinaFil: Exeni Matiuzzi, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; ArgentinaFil: Storey, Melissa. University of Georgia; Estados UnidosFil: Li, Catherine. University of Georgia; Estados UnidosFil: Szajnman, Sergio Hernan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; ArgentinaFil: Docampo, Roberto. University of Georgia; Estados UnidosFil: Moreno, Silvia N. J.. University of Georgia; Estados UnidosFil: Rodriguez, Juan Bautista. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad de Microanálisis y Métodos Físicos en Química Orgánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Unidad de Microanálisis y Métodos Físicos en Química Orgánica; Argentin

Proteomic Analysis of the Acidocalcisome, an Organelle Conserved from Bacteria to Human Cells

Acidocalcisomes are acidic organelles present in a diverse range of organisms from bacteria to human cells. In this study acidocalcisomes were purified from the model organism Trypanosoma brucei, and their protein composition was determined by mass spectrometry. The results, along with those that we previously reported, show that acidocalcisomes are rich in pumps and transporters, involved in phosphate and cation homeostasis, and calcium signaling. We validated the acidocalcisome localization of seven new, putative, acidocalcisome proteins (phosphate transporter, vacuolar H+-ATPase subunits a and d, vacuolar iron transporter, zinc transporter, polyamine transporter, and acid phosphatase), confirmed the presence of six previously characterized acidocalcisome proteins, and validated the localization of five novel proteins to different subcellular compartments by expressing them fused to epitope tags in their endogenous loci or by immunofluorescence microscopy with specific antibodies. Knockdown of several newly identified acidocalcisome proteins by RNA interference (RNAi) revealed that they are essential for the survival of the parasites. These results provide a comprehensive insight into the unique composition of acidocalcisomes of T. brucei, an important eukaryotic pathogen, and direct evidence that acidocalcisomes are especially adapted for the accumulation of polyphosphate

D3MOBILE METROLOGY WORLD LEAGUE: TRAINING SECONDARY STUDENTS ON SMARTPHONE-BASED PHOTOGRAMMETRY

The advent of the smartphones brought with them higher processing capabilities and improved camera specifications which boosted the applications of mobile-based imagery in a range of domains. One of them is the 3-D reconstruction of objects by means of photogrammetry, which now enjoys great popularity. This fact brings potential opportunities to develop educational procedures in high schools using smartphone-based 3-D scanning techniques. On this basis, we designed a Project Based e-Learning (PBeL) initiative to introduce secondary students to the disciplines of photogrammetry through the use of their mobile phones in an attractive and challenging way for them. The paper describes the motivation behind the project "D3MOBILE Metrology World League", supported by ISPRS as part of the "Educational and Capacity Building Initiative 2020"programme. With this Science, Technology, Engineering and Mathematics (STEM) initiative, we implement a methodology with the format of an international competition, that can be adapted to daily classwork at the high school level anywhere in the world. Therefore, the championship is essentially structured around a collection of well-thought-out e-learning materials (text guidelines, video tutorials, proposed exercises, etc.), providing a more flexible access to content and instruction at any time and from any place. The methodology allows students to gain spatial skills and to practice other transversal abilities, learn the basics of photogrammetric techniques and workflows, gain experience in the 3-D modelling of simple objects and practice a range of techniques related to the science of measurementS