Oregano essential oil-pectin edible films as anti-quorum sensing and food antimicrobial agents

Edible films can be used as carriers for antimicrobial compounds to assure food safety andquality; in addition, pathogenesis of food bacteria is related to a cell to cell communicationmechanism calledquorum sensing(QS). Oregano essential oil (OEO) has proved to beuseful as food antimicrobial; however, its foodapplications can be compromised by thevolatile character of its active constituents.Therefore, formulation of edible films containingOEO can be an alternative to improve its food usages. QS inhibitory activity of OEO andpectin-OEO films was evaluated usingChromobacterium violaceumas bacterial model.Additionally, antibacterial activity was tested againstEscherichia coliO157:H7,SalmonellaCholeraesuis,Staphylococcus aureus,andListeria monocytogenes. OEO was effective toinhibit bacterial growth at MIC of 0.24 mg/mL for all tested bacteria and MBC of 0.24,0.24, 0.48, and 0.24 mg/mL againstE. coliO157:H7,S.Choleraesuis,S. aureus, andL.monocytogenes, respectively. Pectin-films incorporated with 36.1 and 25.9 mg/mL of OEOshowed inhibition diameters of 16.3 and 15.2 mm forE. coliO157:H7; 18.1 and 24.2 mm forS.Choleraesuis; 20.8 and 20.3 mm forS. aureus; 21.3 and 19.3 mm forL. monocytogenes,respectively. Pectin-OEO film (15.7 mg/mL) was effective againstE. coliO157:H7 (9.3 mm),S. aureus(9.7 mm), andL. monocytogenes(9.2 mm), but not forS.Choleraesuis. Allconcentrations of OEO (0.0156, 0.0312, 0.0625 and 0.125 mg/mL) and pectin-OEO films(15.7, 25.9 and 36.1 mg/mL) showed a significant anti-QS activity expressed as inhibition ofviolacein production byC. violaceum. Additionally, the application of pectin-OEO films waseffective reducing total coliforms, yeast, and molds of shrimp and cucumber slices storedat 4◦C during 15 d.These results demonstrated the potential of pectin films enriched withOEO as food related microorganisms and QS inhibitorsFil: Alvarez, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química. Grupo de Investigación en Ingeniería En Alimentos; ArgentinaFil: Ortega Ramirez, Luis Alberto. Centro de Investigación en Alimentación y Desarrollo. Hermosillo; MéxicoFil: Gutierrez Pacheco, Maria Melissa. Centro de Investigación en Alimentación y Desarrollo. Hermosillo; MéxicoFil: Bernal Mercado, Thalia. Centro de Investigación en Alimentación y Desarrollo. Hermosillo; MéxicoFil: Rodriguez Garcia, Isela. Centro de Investigación en Alimentación y Desarrollo. Hermosillo; MéxicoFil: Ponce, Alejandra Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química. Grupo de Investigación en Ingeniería En Alimentos; ArgentinaFil: Moreira, Maria del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química. Grupo de Investigación en Ingeniería En Alimentos; ArgentinaFil: Roura, Sara Ines. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Ingeniería Química. Grupo de Investigación en Ingeniería En Alimentos; ArgentinaFil: Ayala Zavala, Jesús Fernando. Centro de Investigación en Alimentación y Desarrollo. Hermosillo; Méxic

The Mo(ve)ment to Prioritize Antiracist Mathematics: Planning for This and Every School Year

Dear Colleague, TODOS: Mathematics for ALL is proud of its almost two decades of advocacy for equity and excellence for all children in mathematics education, specifically Latina/o children. Over the years, TODOS has delivered webinars, podcasts, blogs, conferences, and resources for educators, families, and children to address and provide tools to eliminate the harmful practices too many children and families experience in school and in life. This position statement, The Mo(ve)ment to Prioritize Antiracist Mathematics: Planning for This and Every School Year, and supporting commentaries, including one commentary in Spanish - place the essential actions of the 2016 NCSM - TODOS joint social justice position statement, Mathematics Education Through the Lens of Social Justice: Acknowledgment, Actions, and Accountability, into new contexts as a response to our nation\u27s inequities and injustices made visible by COVID-19 and the tragic murders of George Floyd, Brianna Taylor, and other unarmed Black and Brown citizens. No longer could a focus on curriculum, assessment, and instruction alone be enough for children to survive in today\u27s world. It was time to step up, find strength, move beyond hurt, fear, and usual conversations to take leadership in the fight for antiracism..

Race, Language, and Opportunities to Learn: The Mathematics Identity Negotiation of Latino/a Youth

Thesis (Ph.D.)--University of Washington, 2012Decades of research document underperformance of Latino/a youth in mathematics, yet little is known about the day-to-day mathematics socialization of Latino/a youth. This research used qualitative case studies of two Algebra 1 classrooms and seven Latino/a focal students to document and describe two major influences on Latino/a youths' mathematics identities: their individual beliefs and their negotiation of identity in classroom settings. I proposed a three-tiered framework for mathematics identity drawing on students' self-concepts, sociocultural learning theory, and Critical Race Theory (CRT) to research the perspectives Latino/a students had about their own mathematics identities. This study focused on how Latino/a students described the role of language and race in learning mathematics, how Latino/a youth exhibited agency in their mathematics educations, and the role of different features of mathematics classrooms in negotiating their mathematics identities. Findings from students' perspectives suggest racial identity plays a role in the mathematics identity negotiation for Latino/a students in complex ways. Some students readily named stereotypes around Asian students as being high achieving, and then positioned Latino/as as lower achieving. Linguistic identity played a key role in how one pair of focal students in each classroom engaged in strategic partnerships and how they displayed agency--for one student in her own mathematics identity, and for the other student in an attempt to help her partner learn algebra. The findings from the classroom analysis suggest that attending to multiple aspects of classroom practice can provide insight into how Latino/a youth negotiate their mathematics identities in classrooms, and that the proposed aspects of classroom practice may be a useful analytic framework for classroom research. The findings contribute to important dimensions to attend to in the mathematics identity development and classroom socialization experiences of Latino/a youth, and highlight the potential value of CRT in research on mathematics identity. The frameworks proposed could contribute to equity projects focused on the experiences of Latino/a youth and youth from other communities historically marginalized by schooling

Múltiples abordajes para una sociología del arte de América latina. Un estado de la cuestión

Desde sus comienzos, los estudios sobre arte y sociedad vienen siendo tematizadas desde distintas perspectivas y disciplinas que han aportado valiosos aportes que configuran miradas plurales. Los artistas y sus producciones en nuestro continente, las tradiciones y sus rupturas, pueden hacer del arte un objeto fecundo para producir conocimiento sobre la sociedad en el contexto latinoamericano. El aporte desde la sociología, como una de las ciencias sociales claves para nuestra contemporaneidad, puede aportar a la construcción de nuevas perspectivas y tratamientos sobre el arte latinoamericano como parte de los procesos sociales. Con la intención de apoyar este desarrollo, proponemos un recorrido por las obras fundacionales de la sociología del arte, desde un dialogo con los corpus ya producidos por disciplinas vecinas y fundamentalmente, con la Teoría Social del Arte Latinoamericana, para conformar una agenda de temas y bibliografía desde una mirada sociológica sobre el arte

Making Culturally Responsive Mathematics Teaching Explicit: A Lesson Analysis Tool

n the United States, there is a need for pedagogical tools that help teachers develop essential pedagogical content knowledge and practices to meet the mathematical education needs of a growing culturally and linguistically diverse student population. In this article, we introduce an innovative lesson analysis tool that focuses on integrating mathematical thinking, language, culture, and social justice. We argue that these are essential components to culturally responsive mathematics teaching. Using data collected from a 3-year professional development initiative focused on culturally responsive mathematics teaching including teacher discussions, lesson artefacts, and interviews, the study yields two main results about the tool and its impact on teacher thinking: (1) the tool enabled teachers to systematically analyse and critique mathematics lessons with multiple dimensions including mathematical thinking, language, culture, and social justice; (2) the tool fostered purposeful pedagogical dialogue to improve a mathematics lesson along specific culturally responsive dimensions. The findings illustrate the potential of this tool to engage teachers in strategic lesson planning and purposeful discussions to make mathematics lessons culturally responsive and improve the quality of mathematics teaching in the classroom

Seminario de Investigación Aplicada - IS222 - 202101

Descripción: El curso Seminario de Investigación Aplicada permite formar al alumno en la elaboración de un trabajo de investigación teórico-práctico, como conocimiento fundamental del profesional de ingeniería, para lo cual se realiza el desarrollo de las etapas básicas del proceso de investigación científica aplicada, que incluyen recomendaciones, técnicas y metodologías a utilizar en el desarrollo de los proyectos de investigación. Se inicia con la elección del tema de investigación, luego la identificación del problema y concluye con la construcción del Estado del Arte, para lo cual se apoya de búsquedas de recursos principalmente en las bases de datos del Centro de Información, revistas de ingeniería, patentes, normas técnicas, internet, entre otros. De esta manera en el curso se obtienen conocimientos de técnicas y habilidades para la investigación científica, para el aprovechamiento de las tecnologías de información, las mismas que incluyen recomendaciones, técnicas 1y metodologías a utilizar en el desarrollo de los proyectos de investigación Propósito: El curso Seminario de Investigación Aplicada, ha sido diseñado para desarrollar en el alumno conocimientos y habilidades para realizar trabajos de investigación científica necesarios para implementar soluciones en su ejercicio profesional aplicando tecnologías de información, de esta forma se contribuye en la formación de nivel 2 de las competencias generales de ciudadanía y manejo de información y nivel 2 a las competencias específicas de ABET 7 La capacidad de adquirir y aplicar nuevos conocimientos según sea necesario, utilizando estrategias de aprendizaje apropiadas. El requisito es haber aprobado el curso Taller de Proyectos 1. ABET: Accreditation Board for Engineering and Technolog

Recuperación de agua de efluentes de una industria de cereales utilizando membranas

Para recuperar agua de re ú so en actividades industriales, se evaluó el proceso de filtración tangencial con membranas de efluentes previamente tratados por métodos biológicos en la planta experimental del Centro Interamericano de Recursos del Agua (CIRA). Entre las características del efluente destacan una alta turbiedad, la presencia de dos colorantes sintéticos de uso alimenticio, azul brillante y tartrazina, que son causantes de varias cortinas de coloración verde, además del contenido de sales y materia orgánica con valores de DQO aún altos para considerar el re ú so del agua. En la evaluación del proceso de filtración fueron probadas dos membranas cerámicas con umbral de corte de 150 y 15 kDa, y dos poliméricas de fibra hueca con 50 y 13 kDa, integradas individualmente a un equipo de filtración a escala piloto. En cada proceso se determinó el efecto de la presión transmembrana, la velocidad de flujo de agua y las características de la membrana sobre los caudales de agua filtrada y la calidad obtenida. Los resultados mostraron que las membranas de 15 y 13 kDa fueron las más ef icientes en el tratamiento del efluente del CIRA para obtener parámetros de calidad en el agua requeridos para actividades industriales de limpieza de equipos y suministro de agua a calderas. Sin embargo, el flujo de agua recuperada del efluente fue mayor en la membrana de 13 kDa, alcanzando 35 Lh -1 m -2 de flujo de agua permeada durante 120 minutos. Mientras que la membrana más estable fue la de 15 kDa, recuperando 28 Lh -1 m -2 de agua durante 190 minutos, sin problemas de polarización

Global variation in postoperative mortality and complications after cancer surgery: a multicentre, prospective cohort study in 82 countries

© 2021 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 licenseBackground: 80% of individuals with cancer will require a surgical procedure, yet little comparative data exist on early outcomes in low-income and middle-income countries (LMICs). We compared postoperative outcomes in breast, colorectal, and gastric cancer surgery in hospitals worldwide, focusing on the effect of disease stage and complications on postoperative mortality. Methods: This was a multicentre, international prospective cohort study of consecutive adult patients undergoing surgery for primary breast, colorectal, or gastric cancer requiring a skin incision done under general or neuraxial anaesthesia. The primary outcome was death or major complication within 30 days of surgery. Multilevel logistic regression determined relationships within three-level nested models of patients within hospitals and countries. Hospital-level infrastructure effects were explored with three-way mediation analyses. This study was registered with ClinicalTrials.gov, NCT03471494. Findings: Between April 1, 2018, and Jan 31, 2019, we enrolled 15 958 patients from 428 hospitals in 82 countries (high income 9106 patients, 31 countries; upper-middle income 2721 patients, 23 countries; or lower-middle income 4131 patients, 28 countries). Patients in LMICs presented with more advanced disease compared with patients in high-income countries. 30-day mortality was higher for gastric cancer in low-income or lower-middle-income countries (adjusted odds ratio 3·72, 95% CI 1·70–8·16) and for colorectal cancer in low-income or lower-middle-income countries (4·59, 2·39–8·80) and upper-middle-income countries (2·06, 1·11–3·83). No difference in 30-day mortality was seen in breast cancer. The proportion of patients who died after a major complication was greatest in low-income or lower-middle-income countries (6·15, 3·26–11·59) and upper-middle-income countries (3·89, 2·08–7·29). Postoperative death after complications was partly explained by patient factors (60%) and partly by hospital or country (40%). The absence of consistently available postoperative care facilities was associated with seven to 10 more deaths per 100 major complications in LMICs. Cancer stage alone explained little of the early variation in mortality or postoperative complications. Interpretation: Higher levels of mortality after cancer surgery in LMICs was not fully explained by later presentation of disease. The capacity to rescue patients from surgical complications is a tangible opportunity for meaningful intervention. Early death after cancer surgery might be reduced by policies focusing on strengthening perioperative care systems to detect and intervene in common complications. Funding: National Institute for Health Research Global Health Research Unit

Effects of hospital facilities on patient outcomes after cancer surgery: an international, prospective, observational study

© 2022 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY 4.0 licenseBackground: Early death after cancer surgery is higher in low-income and middle-income countries (LMICs) compared with in high-income countries, yet the impact of facility characteristics on early postoperative outcomes is unknown. The aim of this study was to examine the association between hospital infrastructure, resource availability, and processes on early outcomes after cancer surgery worldwide. Methods: A multimethods analysis was performed as part of the GlobalSurg 3 study—a multicentre, international, prospective cohort study of patients who had surgery for breast, colorectal, or gastric cancer. The primary outcomes were 30-day mortality and 30-day major complication rates. Potentially beneficial hospital facilities were identified by variable selection to select those associated with 30-day mortality. Adjusted outcomes were determined using generalised estimating equations to account for patient characteristics and country-income group, with population stratification by hospital. Findings: Between April 1, 2018, and April 23, 2019, facility-level data were collected for 9685 patients across 238 hospitals in 66 countries (91 hospitals in 20 high-income countries; 57 hospitals in 19 upper-middle-income countries; and 90 hospitals in 27 low-income to lower-middle-income countries). The availability of five hospital facilities was inversely associated with mortality: ultrasound, CT scanner, critical care unit, opioid analgesia, and oncologist. After adjustment for case-mix and country income group, hospitals with three or fewer of these facilities (62 hospitals, 1294 patients) had higher mortality compared with those with four or five (adjusted odds ratio [OR] 3·85 [95% CI 2·58–5·75]; p<0·0001), with excess mortality predominantly explained by a limited capacity to rescue following the development of major complications (63·0% vs 82·7%; OR 0·35 [0·23–0·53]; p<0·0001). Across LMICs, improvements in hospital facilities would prevent one to three deaths for every 100 patients undergoing surgery for cancer. Interpretation: Hospitals with higher levels of infrastructure and resources have better outcomes after cancer surgery, independent of country income. Without urgent strengthening of hospital infrastructure and resources, the reductions in cancer-associated mortality associated with improved access will not be realised. Funding: National Institute for Health and Care Research