Antagonistic Toxic Effects of Surfactants Mixtures to Bacteria Pseudomonas putida and Marine Microalgae Phaeodactylum tricornutum

Surfactants can be found in an ever-widening variety of products and applications, in which the combination of several types of surfactants is used to reinforce their properties, looking for synergistic effects between them. After use, they tend to be discarded into wastewater, ending up in aquatic bodies with concerning harmful and toxic effects. The aim of this study is the toxicological assessment of three anionic surfactants (ether carboxylic derivative, EC) and three amphoteric surfactants (amine-oxide-based, AO), individually and in binary mixtures of them (1:1 w/w), to bacteria Pseudomonas putida and marine microalgae Phaeodactylum tricornutum. Critical Micelle Concentration (CMC) was determined to demonstrate the capacity to reduce surface tension and the toxicity of the surfactants and mixtures. Zeta potential (ζ-potential) and micelle diameter (MD) were also determined to confirm the formation of mixed surfactant micelles. The Model of Toxic Units (MTUs) was used to quantify the interactions of surfactants in binary mixtures and to predict if the concentration addition or response addition principle can be assumed for each mixture. The results showed a higher sensitivity of microalgae P. tricornutum to the surfactants tested and their mixtures than bacteria P. putida. Antagonism toxic effects have been detected in the mixture of EC + AO and in one binary mixture of different AOs; this is to say, the mixtures showed lower toxicity than expected.Ministry of Universities of the Spanish Government within the predoctoral grant FPU (Ayudas para la Formacion de Profesorado Universitario) FPU17/0335

Estilos parentales y su relación con el autoestima en estudiantes de quinto de secundaria del colegio particular Francisco Bolognesi, Yanacancha, Pasco, 2023

Esta investigación tiene como objetivo de establecer la relación que existe entre los Estilos Parentales y Autoestima en educandos de quinto de secundaria del colegio Francisco Bolognesi, Yanacancha, Pasco,2023, ante la evidencia de estudiantes que presentan ciertas conductas de inseguridad, teniendo poco control de sus emociones, dieron a conocer que sus padres tienen mal humor, llegan cansados del trabajo y no conversan con los ellos. La investigación es descriptivo, correlacional con enfoque cuantitativo, la muestra se constituyó con 55 estudiantes que cursan el quinto de secundaria. Para recopilar información se utilizaron instrumentos de Autoestima de Coopersmith y el cuestionario de estilos parentales. Los resultados arrojaron; 41.82% (23) de los estudiantes presentan un estilo autoritario y un 61.82% (34) de los estudiantes tienen autoestima media, se utilizó la prueba de Pearson para el cálculo de la relación entre las variables siendo positivo donde las variables son directamente proporcionales, vale decir que a mejor estilo parental, mayor autoestima (,553 ) a un nivel de p

Campaña de Comunicación Digital Integral: Asociación Peruana de Agencias de Viajes y Turismo (APAVIT)

El presente trabajo desarrolla una campaña digital de forma integral para la Asociación Peruana de Agencias de Viajes y Turismo (APAVIT) en un contexto donde el sector turismo se ha visto afectado por la pandemia del COVID-19. Los objetivos principales son dar a conocer APAVIT, motivar y comunicar los beneficios y seguridad de viajar con agencias. Para ello, la campaña trabaja en base al concepto del reencuentro del público objetivo con ese lado viajero que se perdió por la cuarentena, bajo la mirada de un turismo más seguro, ofrecido por las agencias de viaje

Influence of ozonation processes on the microbial degradation of surfactants

The influence of ozonation of aqueous solutions of non-ionic surfactants was investigated in this study. The research was conducted using solutions of amine oxide based surfactants. These surfactants constitute a particular class of non-ionic surfactants that exhibit cationic behaviour in acid solution, they show good foaming properties and are skin compatible. The ozonation process was carried out at 25ºC in a stirred tank reactor for 30 min, where gaseous ozone was bubbled. The degree of mineralization achieved after the ozonation process was evaluated by measuring the total organic carbon before and after ozonation. The influence of ozonation on biodegradability of the solutions was studied using the biodegradation test by Pseudomonas putida. Biodegradation efficiency of the ozonated amine oxides based surfactants was also evaluated. It was found that the effectiveness of ozonation depended on the chemical structure of surfactant molecule. Ozonation only slightly improved biodegradation of these surfactants

Silica micro-and nanoparticles reduce the toxicity of surfactant solutions

In this work, the toxicity of hydrophilic fumed silica microand nanoparticles of various sizes (7 nm, 12 nm, and 50 μm) was evaluated using the luminescent bacteria Vibrio fischeri. In addition, the toxicity of an anionic surfactant solution (ether carboxylic acid), a nonionic surfactant solution (alkyl polyglucoside), and a binary (1:1) mixture of these solutions all containing these silica particles was evaluated. Furthermore, this work discusses the adsorption of surfactants onto particle surfaces and evaluates the effects of silica particles on the surface tension and critical micellar concentration (CMC) of these anionic and nonionic surfactants. It was determined that silica particles can be considered as non-toxic and that silica particles reduce the toxicity of surfactant solutions. Nevertheless, the toxicity reduction depends on the ionic character of the surfactants. Differences can be explained by the different adsorption behavior of surfactants onto the particle surface, which is weaker for nonionic surfactants than for anionic surfactants. Regarding the effects on surface tension, it was found that silica particles increased the surface activity of anionic surfactants and considerably reduced their CMC, whereas in the case of nonionic surfactants, the effects were reversed

Efecto de la leche humana sobre células de sangre y de médula ósea en un modelo de ratos desnutridos: estudio comparativo con leche de vaca

Estudios comparativos entre leche humana y leche de vaca para evaluar su impacto en la recuperación de las células de sangre y de médula ósea afectadas en ratones desnutridos.Comparative studies between human and cow milks in order to evaluate the impact of both milks on the recovery of blood and bone marrow cells affected in malnourished mice.Fil: García, Isabel Mercedes. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Bioquímica Aplicada; Argentina; Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Cátedra de Fisiología Patológica; Argentina;Fil: Salva, Maria Susana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Tucuman. Centro de Referencia para Lactobacilos (i); Argentina;Fil: Zelaya, María Hortensia del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Tucumán. Centro de Referencia para Lactobacilos (i); Argentina; Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Bioquímica Aplicada; Argentina;Fil: Villena, Julio Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - CONICET - Tucuman. Centro de Referencia para Lactobacilos (i); Argentina;Fil: Agüero, Graciela. Universidad Nacional de Tucumán. Facultad de Bioquímica, Química y Farmacia. Instituto de Bioquímica Aplicada; Argentina

Antioxidant intake among maladapted highlanders: link to vascular function

Exposure to high altitude leads to an increased formation of free radicals. This, in Chronic Mountain Sickness sufferers (CMS+), may contribute to systemic vascular dysfunction in comparison to the well-adapted controls (CMS-). The protective role of dietary antioxidants in minimising oxidative stress has been well documented. Furthermore, the nutritional shift from locally sourced foods to westernised, nutrients depleted diet in Latin American urban areas, is also reported. The aim of the study was to investigate vascular function and intake of dietary antioxidants in healthy, well-adapted and diseased maladapted highlanders born and bred in La Paz, Bolivia. We hypothesised that CMS sufferers will show impaired vascular function and low intake of dietary antioxidants compared to well-adapted highlander residents

Desarrollo e implementación de una interfaz para sistema de monitoreo y procesamiento de datos de radiación y temperatura en un parque fotovoltaico en Salta

En este trabajo se detalla el desarrollo e implementación de una interfaz electrónica para un sistema de monitoreo y procesamiento de datos de radiación y temperatura mediante una computadora de placa reducida (Single Board Computer - SBC) en una instalación del proyecto IRESUD, en el mismo se emplea un radiómetro fabricado por la CNEA y un circuito integrado de precisión para el sensado de la temperatura. La adquisición de datos y el procesamiento de la información aprovecha las capacidades del microprocesador ARM Cortex-A53 que comanda la SBC. Debido a la ausencia de conversión analógica-digital en la SBC se desarrolló una interfaz para el acondicionamiento de la señal y conversión A/D. Mediante el empleo de librerías y potentes paquetes de software libre como R y Python, los datos de las mediciones de radiación y temperatura, son almacenados con un motor de base de datos relacional, para facilitar las consultas posteriores para el procesamiento de toda la información recolectada.This work shows the development and implementation of an electronic interface and a monitoring and processing system of radiation and temperature data using a single board computer, in an installation of the IRESUD project, it uses a radiometer manufactured by CNEA and a precision integrated circuit for temperature sensing. Data acquisition and information processing take advantage of the capabilities of the ARM Cortex-A53 microprocessor that commands the SBC. Due to the absence of analog-digital conversion in the SBC an interface was developed for signal conditioning and A/D conversion. The use of libraries and powerful free software packages such as R and Python, the data of radiation and temperature measurements are stored with a relational database engine, to facilitate subsequent queries for the processing of all the information collected.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Desarrollo e implementación de una interfaz para sistema de monitoreo y procesamiento de datos de radiación y temperatura en un parque fotovoltaico en Salta

En este trabajo se detalla el desarrollo e implementación de una interfaz electrónica para un sistema de monitoreo y procesamiento de datos de radiación y temperatura mediante una computadora de placa reducida (Single Board Computer - SBC) en una instalación del proyecto IRESUD, en el mismo se emplea un radiómetro fabricado por la CNEA y un circuito integrado de precisión para el sensado de la temperatura. La adquisición de datos y el procesamiento de la información aprovecha las capacidades del microprocesador ARM Cortex-A53 que comanda la SBC. Debido a la ausencia de conversión analógica-digital en la SBC se desarrolló una interfaz para el acondicionamiento de la señal y conversión A/D. Mediante el empleo de librerías y potentes paquetes de software libre como R y Python, los datos de las mediciones de radiación y temperatura, son almacenados con un motor de base de datos relacional, para facilitar las consultas posteriores para el procesamiento de toda la información recolectada.This work shows the development and implementation of an electronic interface and a monitoring and processing system of radiation and temperature data using a single board computer, in an installation of the IRESUD project, it uses a radiometer manufactured by CNEA and a precision integrated circuit for temperature sensing. Data acquisition and information processing take advantage of the capabilities of the ARM Cortex-A53 microprocessor that commands the SBC. Due to the absence of analog-digital conversion in the SBC an interface was developed for signal conditioning and A/D conversion. The use of libraries and powerful free software packages such as R and Python, the data of radiation and temperature measurements are stored with a relational database engine, to facilitate subsequent queries for the processing of all the information collected.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Acute and Chronic Altitude-Induced Cognitive Dysfunction in Children and Adolescents

OBJECTIVE: To assess whether exposure to high altitude induces cognitive dysfunction in young healthy European children and adolescents during acute, short-term exposure to an altitude of 3450 m and in an age-matched European population permanently living at this altitude. STUDY DESIGN: We tested executive function (inhibition, shifting, and working memory), memory (verbal, short-term visuospatial, and verbal episodic memory), and speed processing ability in: (1) 48 healthy nonacclimatized European children and adolescents, 24 hours after arrival at high altitude and 3 months after return to low altitude; (2) 21 matched European subjects permanently living at high altitude; and (3) a matched control group tested twice at low altitude. RESULTS: Short-term hypoxia significantly impaired all but 2 (visuospatial memory and processing speed) of the neuropsychological abilities that were tested. These impairments were even more severe in the children permanently living at high altitude. Three months after return to low altitude, the neuropsychological performances significantly improved and were comparable with those observed in the control group tested only at low altitude. CONCLUSIONS: Acute short-term exposure to an altitude at which major tourist destinations are located induces marked executive and memory deficits in healthy children. These deficits are equally marked or more severe in children permanently living at high altitude and are expected to impair their learning abilities