Perchlorate Contamination: Sources, Effects, and Technologies for Remediation

Perchlorate is a persistent pollutant, generated via natural and anthropo genic processes, that possesses a high potential for endocrine disruption in humans and biota. It inhibits iodine fixation, a major reason for eliminating this pollutant from ecosystems. Remediation of perchlorate can be achieved with various physi cochemical treatments, especially at low concentrations. However, microbiological approaches using microorganisms, such as those from the genera Dechloromonas, Serratia, Propionivibrio, Wolinella, and Azospirillum, are promising when perchlo rate pollution is extensive. Perchlorate-reducing bacteria, isolated from harsh Perchlorate is a persistent pollutant, generated via natural and anthropo genic processes, that possesses a high potential for endocrine disruption in humans and biota. It inhibits iodine fixation, a major reason for eliminating this pollutant from ecosystems. Remediation of perchlorate can be achieved with various physi cochemical treatments, especially at low concentrations. However, microbiological approaches using microorganisms, such as those from the genera Dechloromonas, Serratia, Propionivibrio, Wolinella, and Azospirillum, are promising when perchlo rate pollution is extensive. Perchlorate-reducing bacteria, isolated from hars

Microscope-Integrated Intraoperative Optical Coherence Tomography in Retinal Surgery

Imaging techniques of the posterior segment of the eye have gradually evolved and tremendously improved during the last decade. A widespread implementation of optical coherence tomography (OCT) for the management and diagnosis of retinal conditions, with a concurrent advance in integrative technology, led to the integration of the OCT into the microscope for its intraoperative use. Regarding posterior segment eye surgery, some of the most common diagnoses in which microscope-integrated OCT (MIOCT) can result of great value are epiretinal membrane, macular hole (MH), proliferative diabetic retinopathy (PDR) and, less frequently, for inflammatory diseases, chorioretinal biopsies, and retinal implants. The impact on the surgical procedure and, possibly, on the postoperative outcome could relate to the definition of whether or not a membrane has been entirely peeled, the presence of residual membranes, and the option to perform a dissection without the need of vital dyes. The possibility of correct topographical location of hemorrhages, suspect lesions, or implants can also facilitate the surgical decision-making during biopsies or prosthesis implantation. Microscope-integrated OCT is a feasible and useful tool that can provide valuable information during surgery impact on decision-making, anatomic results, surgical safety and provide opportunity to individualize surgical treatment for each patient

Shear resistance of different web panels of linearly tapered bridge girders with steel corrugated webs

Although steel girders have been u sed for many years, new gener ation of optimized steel girders is developed by the advances in structural and fabricat ion technology. Girders with corrugated webs are used in bridge s as an efficient alternative to conventional girders with flat stiffened webs, It was also found that, the vertically corrugat ed girders had a 10.6% reduction in weight when compared with the beam with flat web.[1] Advantages Economical design of steel girders normally requires thin webs. The use of corrugated webs is a possible wa y of achieving adequate out-of- plane stiffness without using stiffeners. Particularly in bri dge girders with corrugated webs (BGCWs), the corrugated webs are the main elements for bearing the shear forces. Instead of prismatic BGCWs, tapered BGCWs are currently used mainly due to their structural efficie ncy, providing at the same time aesthetical appearance. Available literature shows that tapered BGCWs may be classified into four typologies. Among these typologies, Case I and Case II are the most common cases appearing commonly near to the intermediate supports of continuous bridges. Accordingly, in this thesis, the finite element (FE) method is employed to investigate the inelastic behaviour of tapered BGCWs of Case I and Case II, fol lowing to the fundamental behaviour of such girders published recently by Hassanein et al [6]. The thesis seeks, firstly, considering initial imperfection amp litudes of 200 / 1 w h . Accordingly, with euro code 3 part 1-5, annex D [12], 1 w h is the height of the long vertical edge of the web panel, it investigates the effect of the aspect ratio of the we b panels, different flange inclination angles and different web thickness. Finally, the thesis checks previously proposed design model usi ng the results of the generated parametric studies. Overall, the outcomes of this study are exp ected to provide more insight into the behaviour of tapered BGCWs and enable accurate predict ion of the shear capacity of this special type of BGCWs

Docencia universitaria, enseñanza semipresencial en el logro de aprendizaje en estudiantes de medicina IV ciclo. Ica 2022

Esta investigación tuvo como objetivo verificar si la docencia universitaria y la enseñanza semipresencial influyen en el logro de aprendizaje en estudiantes de medicina humana. La metodología que se empleó fue cuantitativa, no experimental, transversal y correlacional explicativo. Se trabajó con una muestra de 497 estudiantes que representóel99.4%de la población total, a los cuales se les aplicó los instrumentos de investigación deforma virtual a través de formularios diseñados en Google Form. Dentro de los resultados,se encontró que el 77% de los estudiantes perciben un alto nivel de docencia en sus docentes, mientras que el 73% de los estudiantes opina que sus docentes muestran un alto nivel en la enseñanza semipresencial. A su vez, el 70% de los estudiantes muestra un nivel alto de logro de aprendizaje. Por otro lado, se ha comprobado la existencia de relación positiva entre la docencia universitaria y la enseñanza semipresencial con el logro de aprendizaje en los estudiantes,común nivel de significancia de 0.05. De igual forma, se comprueba la influencia de la retroalimentación, de las nuevas competencias digitales, del uso de la plataformaBlackboard y de los recursos educativos audiovisuales sobre el logro de aprendizaje enlos estudiantes

Alfabetización económica en la población más vulnerable de barraquilla

The monetary economy had generated a great deal of financial products and services which knowledge is necessary. This article aims to analyze the economic literacy situation and its characterization in terms of consumption and debt in vulnerable families in Barranquilla, Colombia. From a survey in 18 poor families selected by non-probabilistic sample, the results shown that adolescents and adults have difficulties to understand basic economic concepts, however they have skills, abilities, and attitudes to manage financial resources. In addition, the sample families suffer tensions between low income with liquidity preference, imitation, and conspicuous effects. We conclude that economic literacy assumed and managing by sampling families corresponding mainly to surviving strategies in the context of income effect. © 2021, Universidad del Zulia. All rights reserved.En la economía monetaria se ha generado una gran gama de productos y servicios financieros cuyo conocimiento es cada vez más necesario. Este trabajo busca analizar la situación del alfabetismo económico y la caracterización de los hábitos de consumo y endeudamiento de familias vulnerables de la ciudad de Barranquilla, Colombia. Para eso se realizó una encuesta a 18 familias de los estratos 1, 2 y 3, seleccionados mediante un muestreo opinático. Los resultados muestran que jóvenes y adultos presentan dificultades, para comprender conceptos económicos básicos, pero que poseen habilidades, destrezas en el manejo de sus recursos. Además, en estas familias se vive la tensión entre contar con ingresos bajos y lidiar contra el efecto imitación, la preferencia por la liquidez o el efecto conspicuo. Se concluye, que el conocimiento económico que asumen y manejan las personas de la muestra corresponden más a estrategias de supervivencia con preponderancia del efecto ingreso

Perchlorate-Reducing Bacteria from Hypersaline Soils of the Colombian Caribbean

[EN] Perchlorate (ClO4¿) has several industrial applications and is frequently detected in environmental matrices at relevant concentrations to human health. Currently, perchlorate-degrading bacteria are promising strategies for bioremediation in polluted sites. The aim of this study was to isolate and characterize halophilic bacteria with the potential for perchlorate reduction. Ten bacterial strains were isolated from soils of Galerazamba-Bolivar, Manaure-Guajira, and Salamanca Island-Magdalena, Colombia. Isolates grew at concentrations up to 30% sodium chloride. The isolates tolerated pH variations ranging from 6.5 to 12.0 and perchlorate concentrations up to 10000¿mg/L. Perchlorate was degraded by these bacteria on percentages between 25 and 10. 16S rRNA gene sequence analysis indicated that the strains were phylogenetically related to Vibrio, Bacillus, Salinovibrio, Staphylococcus, and Nesiotobacter genera. In conclusion, halophilic-isolated bacteria from hypersaline soils of the Colombian Caribbean are promising resources for the bioremediation of perchlorate contamination.This research received support from the Vice Presidency of Research, University of Cartagena; and Colciencias-University of Cartagena (Grant: RC-758-2011/1107-521-29360).Acevedo-Barrios, R.; Bertel-Sevilla, A.; Alonso Molina, JL.; Olivero-Verbel, J. (2019). Perchlorate-Reducing Bacteria from Hypersaline Soils of the Colombian Caribbean. International Journal of Microbiology. 2019:1-13. https://doi.org/10.1155/2019/6981865S1132019Cole-Dai, J., Peterson, K. M., Kennedy, J. A., Cox, T. S., & Ferris, D. G. (2018). Evidence of Influence of Human Activities and Volcanic Eruptions on Environmental Perchlorate from a 300-Year Greenland Ice Core Record. Environmental Science & Technology, 52(15), 8373-8380. doi:10.1021/acs.est.8b01890Acevedo-Barrios, R., Sabater-Marco, C., & Olivero-Verbel, J. (2018). 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CsgA, an extracellular protein essential for Myxococcus xanthus development. Journal of Bacteriology, 172(9), 5299-5306. doi:10.1128/jb.172.9.5299-5306.1990Acevedo-Barrios, R., Bertel-Sevilla, A., Alonso-Molina, J., & Olivero-Verbel, J. (2016). Perchlorate tolerant bacteria from saline environments at the Caribbean region of Colombia. Toxicology Letters, 259, S103. doi:10.1016/j.toxlet.2016.07.257Iizuka, T., Tokura, M., Jojima, Y., Hiraishi, A., Yamanaka, S., & Fudou, R. (2006). Enrichment and Phylogenetic Analysis of Moderately Thermophilic Myxobacteria from Hot Springs in Japan. Microbes and Environments, 21(3), 189-199. doi:10.1264/jsme2.21.189Wu, Z.-H., Jiang, D.-M., Li, P., & Li, Y.-Z. (2005). Exploring the diversity of myxobacteria in a soil niche by myxobacteria-specific primers and probes. Environmental Microbiology, 7(10), 1602-1610. doi:10.1111/j.1462-2920.2005.00852.xHuang, X. (1999). CAP3: A DNA Sequence Assembly Program. 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Skin color correction via convolutional neural networks in 3D fringe projection profilometry

Fringe Projection Profilometry (FPP) with Digital Light Projector technology is one of the most reliable 3D sensing techniques for biomedical applications. However, besides the fringe pattern images,often a color texture image is needed for an accurate medical documentation. This image may be acquired either by projecting a white image or a black image and relying on ambient light. Color Constancy is essential for a faithful digital record, although the optical properties of biological tissue make color reproducibility challenging. Furthermore, color perception is highly dependent on the illuminant. Here, we describe a deep learning-based method for skin color correction in FPP. We trained a convolutional neural network using a skin tone color palette acquired under different illumination conditions to learn the mapping relationship between the input color image and its counterpart in the sRGB color space. Preliminary experimental results demonstrate the potential for this approach

A method for detecting the profile of an author

This paper presents a method for detecting an author’s profile using the following two elements: gender and age. This is based on a set of dialogues, written in two languages: English and Spanish, provided for Author Profiling competence within the evaluation forum "Uncovering Plagiarism, Authorship, and Social Software Misuse" (PAN2018). Counts of lexical, semantic, and syntactic characteristics are used to generate a two-phase classification system, which first classifies gender and then age. The results obtained show that, with the amount of data available, it is possible to characterize both the age and gender of an author with an accuracy greater than 50%. However, these values could be improved by having more evidence of information in the training data

Implementación de un Plan Ergonómico para reducir riesgos musculoesqueléticos en la empresa HOME SAFETY S.A.C., 2022

El presente estudio que tiene por título “Implementación de un Plan Ergonómico parareducir Riesgos Musculoesqueléticos en la Empresa Home Safety S.A.C., Trujillo, 2022” tuvo como objetivo implementar un plan ergonómico para disminuir los riesgos musculo – esqueléticos en la empresa Home Safety para lo cual se emplearon herramientas de evaluación como: Una Guía Rápida de Identificación de Riesgos Ergonómicos, el Cuestionario Nórdico y los métodos RULA, OWAS y CHECK LIST OCRA. El diseño del estudio fue pre – experimental de tipo aplicada y el tamaño muestral fuede 7 trabajadores del área de Operaciones y Logística. Los resultados mostraron quehubo una disminución del nivel de riesgo después de la implementación del plan ergonómico: Para el método RULA, el riesgo disminuyó en un nivel; para el método OWAS el nivel de riesgo de las posturas que se encontraban en un nivel alto, disminuyó a una categoría de riesgo de 1 a 2 y finalmente para el CHECK LIST OCRA,ambos niveles de los dos puestos disminuyeron a un Nivel Leve. Se concluye que la implementación de un plan ergonómico si disminuyen los riesgos musculoesqueléticos