Omar Ruiz-Barzola

• Professor
• Professor at Escuela Superior Politecnica del Litoral

The relationship between burnout and emotional intelligence has been widely studied. Alterations in dimensions, such as emotional exhaustion, personal accomplishment and intrapersonal skills have shown a close relationship with teaching, with notable differences with other dimensions, such as depersonalization and interpersonal skills. Objective: A...

The objective of this study was to evaluate the antioxidant capacity by spectrophotometric methods, the in vitro and in vivo antifungal effect against Lasiodiplodia theobromae and the constitution of the essential oils (EO) of oregano and thyme in comparison with their commercial counterparts. The results showed by the EOs of extracted thyme (T-EO)...

Desde inicios del año 2020 se han venido realizando un sin número de publicaciones científicas acerca de la enfermedad Covid-19. El presente trabajo tiene como objetivo usar la metodología de Análisis Triádico Parcial (PTA o XSTATIS) para estudiar las principales causas de muerte en Ecuador en 2020, año en que la Covid-19 estuvo presente, y cómo va...

Simple Summary The T2Qv control chart is presented as a multivariate statistical process control technique that performs an analysis of qualitative data through Multiple Correspondence Analysis (MCA), multiple factorial analysis, and the Hotelling T2 chart. Abstract The scientific literature is abundant regarding control charts in multivariate env...

The use of liquid organic amendments (biols) is a common practice for farmers due to the multiple benefits in the management and production of their crops, including the control of pests and diseases. The present study analyzes the chemical composition of the pure compound C1 and fractions F2 and F3 of local biols produced in two provinces of Ecuad...

La contaminación de los sistemas acuáticos de agua dulce constituye un problema ambiental recurrente en el ámbito mundial, que se agudiza cada vez más con la presencia frecuente de nuevos compuestos químicos, tal es el caso de los contaminantes emergentes, dentro de los cuales se incluyen los productos farmacéuticos. El objetivo de esta investigaci...

Environmental pollution caused by mercury has received increasing attention in recent years. Several studies have warned of the high rates of biomagnification in superior levels of marine food networks affecting seabirds. Although seabird feathers are reported as bioindicators of mercury, the possibility of using the microbiota associated with them...

Se evidenció que el 2020 (COVID) tuvo un comportamiento disimilar al resto de años en registros hospitalarios. Durante el verano (jul, sep, oct y nov) la relación salud-clima es más fuerte. La TSA y la VV_NE inciden principalmente en los casos de dengue y neumonía en Gye urbano. https://eventos.emagister.com/congresos/clivar-2023-towards-an-integr...

The potential antagonistic effect of babaco mosaic virus (BabMV) against papaya ringspot virus (PRSV) was investigated under greenhouse and field conditions. Carica papaya plants previously inoculated with BabMV were challenged with PRSV and monitored over time. Reverse-transcription quantitative PCR showed an average 61% reduction of PRSV genomic...

Hermetia illucens is an important species for waste management and the circular economy. The aim of this study was to analyze the effects of Trichoderma reesei C2A and Pleurotus sp. as pretreatments of brewer spent grain (BSG). BSG was inoculated with fungal solution or distilled water (control). After seven days, this was used for H. illucens larv...

RESUMEN El Na y el Pb en concentraciones altas pueden afectar el desarrollo de los cultivos. Una alternativa para mitigar el estrés vegetal ocasionado por estos elementos es la inoculación con hongos micorrízicos arbusculares (HMA). El presente trabajo se realizó con el objetivo de evaluar la absorción del Na y Pb en plantas de cucurbitáceas (Citru...

Objectives The purpose of this study was to design a digital graphic recipe book by optimizing food preparations to develop new culinary skills and improve the eating habits of the families that integrate the Bellavista community in the Gulf of Guayaquil. Methods A descriptive-observational non-experimental cross-sectional study was carried out wi...

Introducción: El modelo estético corporal es un conjunto de pautas fuertemente influyentes sobre las características físicas corporales, regidas principalmente por el culto al atractivo físico con el exaltamiento a la delgadez del cuerpo. Objetivo: Comparar la influencia del modelo estético corporal que contribuye al adelgazamiento entre estudiant...

The objective of the research was to determine the directionality of intrafamily violence in relation to the type of aggression, drug of initiation of consumption, educational level, sex, disturbing experiences, age group and marital status. The research was conducted in a group of drug-dependent patients treated in the Addictive Behaviors Unit of...

Bananas are one of the most important crops worldwide. However, a large amount of residual lignocellulosic biomass is generated during its production and is currently undervalued. These residues have the potential to be used as feedstock in bio-based processes with a biorefinery approach. This work is based on the valorization of banana leaf and ha...

Description It covers approaches to multivariate analysis of variance, PERMANOVA and a Bayesian analysis , presenting an assumption test section together with a decision diagram that will allow selecting the appropriate technique for the analysis. The presentation of results is through an interactive panel, in which you can view automatic conclusio...

n this study, a logistic regression model was implemented to analyze the associated factors with the death risk because of COVID-19, such as sex, age, presumptive diagnosis, and the viral contingency assignment to a viral contingency unit of patients a hospital in Ecuador. An exploratory analysis including a time series visualization was also made...

Introducción: El consumo de drogas es considerado un elemento favorecedor de las conductas suicidas. En la medida que aumenta la frecuencia, intensidad, tiempo de consumo y la coexistencia con otros trastornos mentales también se incrementa la probabilidad de un comportamiento violento hacia sí mismo. Objetivo: Caracterizar pacientes adictos ecuat...

Description It covers various approaches to analysis of variance, provides an assumption testing section in order to provide a decision diagram that allows selecting the most appropriate technique. It provides the classical analysis of variance, the nonparametric equivalent of Kruskal Wallis, and the Bayesian approach. These results are shown in an...

The study of biotic and abiotic factors and their interrelationships is essential in the preservation of sustainable marine ecosystems and for understanding the impact that climate change can have on different species. For instance, phytoplankton are extremely vulnerable to environmental changes and thus studying the factors involved is important f...

Micropropagation techniques allow the mass production of banana plants but can cause somaclonal variations such as dwarfism. Changes in the metabolite profile during micropropagation of normal (NP) and dwarf (DP) banana plants have not been described. Both, NPs and DPs of banana Musa AAA cv. Williams were micropropagated and the metabolite profile...

Los productos farmacéuticos constituyen un grupo único de contaminantes emergentes de gran interés, debido a que se ha determinado su presencia frecuente en aguas superficiales, subterráneas y agua potable. Debido al metabolismo y la absorción incompletos en el organismo humano, una cantidad significativa de estos fármacos se excretan y liberan al...

Los productos farmacéuticos (PFs) constituyen un grupo importante de los contaminantes emergentes (CE), debido a su potencial para inducir efectos fisiológicos adversos a bajas concentraciones en humanos y animales. Muchos estudios alrededor del mundo han reportado la presencia de un sin número de estos compuestos en diferentes medios acuáticos, lo...

El control estadístico multivariante de procesos para la producción por lotes generalmente toma en consideración características correlacionadas para la inspección del desempeño del proceso. En la literatura, los investigadores han utilizado varias técnicas estadísticas de forma individual para abordar esta inspección durante las fases de control y...

In this paper, we highlight the basic techniques of multivariate statistical process control (MSPC) under the dimensionality criteria, such as Multiway Principal Component Analysis, Multiway Partial Squares, Structuration à Trois Indices de la Statistique, Tucker3, Parallel Factors, Multiway Independent Component Analysis, Multiset Canonical Correl...

Background Micropropagation techniques allow the mass production of pathogen-free banana plants but can cause somaclonal variations (SV) such as dwarfism. Changes in the metabolite profile during micropropagation of true-to-type (normal) and dwarf banana plants have not been described. Normal and dwarf banana Musa AAA cv. “Williams” were micropropa...

Objetivos: Caracterizar la conducta suicida en drogodependientes ecuatorianos según edad, sexo, vínculo laboral, tipo de droga consumida, tiempo de consumo, edad de inicio de consumo y correlacionarla con la dualidad. Materiales y métodos: Estudio transversal con 922 pacientes drogodependientes que han sido ingresados en la Unidad de Conductas Adic...

This research puts into context statistical multivariate methods in the political arena, making the first contribution to the analysis of Ecuadorian politics on the definition of elected mayors' profile. In this regard, a logistic regression model was estimated to describe voters' preferences in terms of candidates' age, gender and political organi...

Multivariate data collected from batches is usually monitored via control charts (CCs) based on MPCA and MPLS for batch to batch comparison. In addition, distribution free approaches include other dimensionality reduction methods for batch and time-wise analysis. However, techniques for multivariate data focused on variable-wise analysis haven’t be...

The temperature and extraction time of aqueous extracts of Vernonanthura patens (Kunth) H. Rob. (AEVP) leaves obtained by decoction were optimized for maximum recovery of DPPH radical scavenging activity, ABTS⁺ inhibition activity, total phenolic content (TPC) and total flavonoids content (TFC) using response surface methodology (RSM). A central co...

Eastern Equatorial Pacific, known for its phytoplankton richness and for containing the Niño 1+2 region, characterized by its sensitivity to detect variations in sea surface temperature, makes it an area of great interest for this research. The data are from 4 fixed stations 10 miles from the coastal profile of Ecuador Continental (3 located in Niñ...

Eastern Equatorial Pacific, known for its phytoplankton richness and for containing the Niño 1+2 region, characterized by its sensitivity to detect variations in sea surface temperature, makes it an area of great interest for this research. The data are from 4 fixed stations 10 miles from the coastal profile of Ecuador Continental (3 located in Niñ...

The ocean is intrinsically linked to human health as it provides food and wellbeing, yet shifts in its dynamics can pose climate-ecological risks, such as harmful algal blooms (HABs) that can impact the health and economy of coastal communities. For decades, Ecuadorian coastal communities have witnessed seasonal algal blooms, events that are driven...

The ocean is intrinsically linked to human health as it provides food and wellbeing, yet shifts in its dynamics can pose climate-ecological risks, such as harmful algal blooms (HABs) that can impact the health and economy of coastal communities. For decades, Ecuadorian coastal communities have witnessed seasonal algal blooms, events that are driven...

The Eastern Equatorial Pacific zone is recognized for its high biological productivity. In particular, the period 2013, 2014 and 2015 was a warm event of great importance in the region. Thus, with this investigation it was intended to study the surface spatio-temporal behavior of phytoplankton abundance, and the variations in environmental paramete...

With multivariate processes, it may happen that some quality variables are more expensive and/or difficult to measure than the other ones, or they may demand much more time to measure. Their measurement may even be destructive. For monitoring such processes, the variable dimension approach was recently proposed. The idea is to measure always (at ea...

The variable-dimension T² control chart (VDT² chart) was recently proposed for monitoring the mean of multivariate processes in which some of the quality variables are easy and inexpensive to measure while other variables require substantially more effort or expense. The chart requires most of the times that only the inexpensive variables be sample...

Resumen-En los últimos años, estudios realizados sobre la participación de la mujer en distintos contextos han desvelado las diferencias que existen entre las oportunidades que reciben hombres y mujeres. Las instituciones de educación superior, en sus carreras de ciencias e ingeniería, no son la excepción. El presente estudio, utilizó los conocimie...

This paper introduces a new mathematical algorithm termed Clustering Disjoint HJ-Biplot (CDBiplot), which searches for the underlying data structure in order to find the best classification of the object groups in a reduced space. To this end, disjoint factorial axes are generated, in which each variable only contributes to the formation of one fac...

This paper analyzes trace elements concentrations from surface detrital sediments corresponding to 4 rivers located in the artisanal gold mining area of Ponce Enríquez (southern Ecuador) to assess the contamination levels. Moreover, their potential environmental threats were evaluated using both the enrichment factors (EFs) approach and sediment qu...

The ocean is a critical component of the climate system, and changes in their conditions lead to shifts in the biodiversity dynamics of oceans and subsequently in the livelihoods of coastal communities. Associated with seasonal climate drivers, Ecuadorian coastal communities have been witnessing red tides in the coastal zone for decades. However, l...

This study examines the spatio-temporal structure of phytoplankton assemblages in Eastern Equatorial Pacific. Besides it refers to the environmental parameters and phytoplankton (23 species) recorded ten miles offshore of the coastline of Ecuador Continental, in the Region “El Niño 1 + 2". For this work were defined two sampling seasons (rainy and...

The Ocean is a critical component of the climate system, and changes in their conditions lead to shifts in the biodiversity dynamics of oceans and subsequently in the livelihoods of coastal communities. Associated with seasonal climate drivers, Ecuadorian coastal communities have been witnessing red tides in the coastal zone for decades. However, l...

Análisis del Polimorfismo de 21 Genotipos de Musa spp., Mediante el Uso de Marcadores Microsatélites, para determinar la relación entre la diversidad genética y la resistencia a M.fijiensis Morelet, causante de la Sigatoka negra.

Quality of a product is often measured through various quality characteristics generally correlated. Multivariate control charts are a response to the need for quality control in such situations. If quality characteristics are qualitative, it sometimes happens that the product quality is defined by linguistic variables – where quality levels are re...

In this paper, we describe the development of the variable dimension and variable sample size T 2 control chart (VSSVDT2), which is an enhancement of the variable dimension T 2 chart (VDT2). In the VDT2 control chart, the number of variables that are measured to compute the T 2 statistic is made variable. Some of the variables are easy or inexpensi...

In some real situations there is the need of controlling p variables of a multivariate process, where p1 out of these p variables are easy and inexpensive to monitor, while the p2=p–p1 remaining variables are difficult and/or expensive to measure. However, this set of p2 variables is important to quickly detect the process shifts. This paper develo...

Esta investigación, tuvo como objetivo principal establecer indicadores de calidad en el proceso de fermentación anaerobia de bioles de producción local y conocer sus principales componentes químicos. Se realizó la determinación periódica de los parámetros físico químicos "in situ" y en laboratorio, luego se realizó un tamizaje químico, evaluándose...

Introduction: Vernonanthura patens (Kunth) H. Rob., a native shrub from South America, grows wild in southern Ecuador. The people of Canton Marcabelí, El Oro province, know it as "laritaco" and use aqueous brews of the leaves to wash and heal wounds, to soothe headaches, to reduce inflammation, to soothe coughs and to combat certain types of cancer...

Introduction: Vernonanthura patens (Kunth) H. Rob., a native shrub from South America, grows wild in southern Ecuador. The people of Canton Marcabelí, El Oro province, know it as laritaco and use aqueous brews of the leaves to wash and heal wounds, to soothe headaches, to reduce inflammation, to soothe coughs and to combat certain types of cancer....

This paper proposes a new multivariate T2 control chart, termed the variable dimension T2 (VDT2) chart, in which the number of monitored quality characteristics is variable. When there are p related variables to be monitored, the approach is useful if there is a subset of p1 variables that are easy and/or inexpensive to measure, while the remaining...

El presente estudio tuvo como finalidad el aprovechamiento de los residuos azucareros de forma técnicamente viable por medio de la producción y evaluación del proceso de compostaje. Para lograr los objetivos se establecieron combinaciones de tres tipos de materia prima, dos fuentes de microorganismos y dos métodos de aireación. Las pilas se estable...

Because during all seasons rejected many fruits of the genus Musa plants, including bananas in the country has begun to investigate and take the rejection to facilitate the production of bioethanol from biomass the fruit. As a contribution of statistics in this issue, we conducted this project to be identified by plant physiological descriptors (he...

In this work, an audit is conducted to a branch bank in a given period by applying basic audit techniques to determine the integrity, availability and confidentiality of information. The methodology includes the same steps that are in a financial audit, which covered from a complete knowledge of the business to the issuance of a report of the obser...

Black Sigatoka, caused by the leaf fungus Mycosphaerella fijiensis Morelet, is a major constraint to banana production around the world. In Ecuador, the biggest banana-exporting country in the world, this disease has become increasingly aggressive. This has resulted in more fungicide applications, which have significantly increased costs in product...

El fin del presente trabajo, fue desarrollar un estudio referencial de las técnicas estadísticas, posibles de utilizar para la valoración de la calidad de productos orgánicos sólidos o líquidos elaborados en fincas bananeras del Litoral Ecuatoriano. Los datos utilizados corresponden a índices químicos, físicos y microbiológicos, de las enmiendas or...

Se realizó el presente estudio para obtener una escala porcentual, que permita evaluar el desarrollo de la Sigatoka negra sobre plantas en invernadero. Los datos utilizados en este estudio corresponden a imágenes digitales obtenidas de las hojas de plantas de banano inoculadas en invernadero del Centro de Investigaciones Biotecnológicas del Ecuador...

Este trabajo consiste en la determinación y aplicación de métodos estadísticos para medir estabilidad genética en variedades o genotipos de banano. Los análisis se aplicaron a la población objetivo identificada como las plantas de banano de las variedades ESPOL 13, WILLIAMS, VALERY y FILIPINO. Los datos fueron recolectados por el Centro de Investig...

El presente trabajo despeja la interrogante de la aplicabilidad de la minería de datos, en estudios de diferentes variedades de banano ubicadas en varias zonas geográficas. Aborda cada una de las etapas que conlleva la preparación de los datos, la creación del repositorio de la data, y una aplicación amigable que hace uso de Excel y sus tablas diná...

Todo centro de investigacion, genera soluciones a problemas cotidianos del sector productive. En el presente trabajo, abordaremos el tema de la bhsqueda de la autogestion de un centro dedicado a la investigacion en biotecnologia, a travks del mejoramiento de uno de sus procesos, obtenido de sus investigaciones. Se analiza el proceso de sensibilidad...

En este trabajo se desarrolla el Diseño del Curso de Estadística Básica en la modalidad a Distancia para Ingeniería Básica, ajustando este diseño al programa de Estadística utilizado por el Instituto de Matemáticas (ICM) para los estudiantes de Ingeniería Básica, con ello se desea cumplir con la Misión de la ESPOL, utilizando nuevas metodologías de...

This research is focus in the development of embryogenic calluses from in vitro plants of Musa spp.: Orito (genotype AA), Barraganete (AAB), Dominico (AAB), Morado (AAA), Williams (AAA) and Calcutta – 4 (AA), in different culture media (solid and liquid) using apical meristem and scalps. The triploid varieties and Calcutta - 4 showed suitable in vi...