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Mostrando publicaciones 4814-4833 de 5051
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Ugi reaction-derived prolyl peptide catalysts grafted on the renewable polymer polyfurfuryl alcohol for applications in heterogeneous enamine catalysis
(2019)The multicomponent synthesis of prolyl pseudo-peptide catalysts using the Ugi reaction with furfurylamines or isocyanides is described. The incorporation of such a polymerizable furan handle enabled the subsequent ...
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Ultrasound reference values for the calcaneus of children and adolescents at moderate altitudes in Peru
(2021)Objective: a) Establish reference values for bone parameters by using the speed of sound (SOS, m/s) of broadband ultrasound attenuation (BUA, dB/MHz) and establish a bone quality index (BQI=αSOS+βBUA) for children and ...
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Um estudo comparativo com gráficos estatísticos a partir de atividades de livros didáticos do 2º ano do ensino fundamental no Brasil e no Chile
(2020)En este artículo describimos los resultados de un estudio comparativo sobre gráficos estadísticos en las actividades propuestas en los libros de texto de 2° año de Educación Primaria en Brasil y Chile, dirigidos a niños ...
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UML y CATALYSIS, una comparativa
(Universidad Católica del Maule, Facultad de Ciencias de la Ingeniería, 2005)En este informe se presenta una comparativa entre un lenguaje y una metodología, ambas destinadas al modelado de datos; estas son UML y Catalysis. Es importante aclarar el uso del término metodología, para generalizar y ...
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Uncertainty quantification for plant disease detection using Bayesian deep learning
(2020)Climate change is having an enormous impact on crop production in Latin America and the Caribbean. This problem not only concerns the volume of crop production but also the quality and safety of the food industry. Several ...
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Undergraduate occupational health nursing education in Chile, Colombia, Brazil, and Mexico
(2024)Background: Occupational health nursing plays a fundamental role in addressing the health of the working population; however, training in this area differs around the world in terms of levels, duration, content, and ...
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Understanding elementary and secondary students' representation of cultural differences as reflected in the process of intercultural communication in school contexts
Sanhueza, Susan
; ; (2015)
The purpose of this study was to describe and discuss students' perceptions and attitudes toward cultural differences as reflected in the processes of intercultural communication in culturally diverse classrooms. We chose ...
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Understanding how much TV is too much: a nonlinear analysis of the association between television viewing time and adverse health outcomes
(2020)Objective: To inform potential guideline development, we investigated nonlinear associations between television viewing time (TV time) and adverse health outcomes. Methods: From 2006 to 2010, 490,966 UK Biobank participants, ...
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Understanding the life experience of people on hemodialysis: Adherence to treatment and quality of life.
(2014)This hermeneutic-phenomenological study explores the lived experiences of patients on hemodialysis in regard to the adherence to treatment and quality of life. Fifteen patients were interviewed, including six women and ...
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Unfolding political attitudes through the face: facial expressions when reading emotion language of left- and right-wing political leaders
(2019)Spontaneous emotionally congruent facial responses (ECFR) to others’ emotional expressions can occur by simply observing others’ faces (i.e., smiling) or by reading emotion related words (i.e., to smile). The goal of the ...
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Unidad Popular durante la Guerra Fría: una aproximación desde la experiencia de la Nueva Canción Chilena
(2022)El presente ensayo aborda el proyecto de la Unidad Popular en Chile desde el contexto de la Guerra Fría. A través de un enfoque cultural y político, permite entender la experiencia de la Nueva Canción Chilena dentro de la ...
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Universal mental health screening with a focus on suicidal behaviour using smartphones in a mexican rural community: protocol for the smartscreen population-based survey
(2020)Introduction: Mental disorders represent the second cause of years lived with disability worldwide. Suicide mortality has been targeted as a key public health concern by the WHO. Smartphone technology provides a huge ...
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University social responsibility and environmental education. Challenges for the training of socially responsible professionals
(2024)The study of university social responsibility (USR) shows the link that values-based education has in the training of professionals committed to the needs of society, which includes the challenges of sustainability, the ...
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University social responsibility and environmental education: Challenges that contribute to the development of educational policies in Chile
(2024)University social responsibility (USR), environmental education, and sustainability are linked and, at the same time, evidently promoted through policies that consider the goals of the Sustainable Development Goals (SDGs). ...
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Unraveling biotypes of the northern house mosquito, Culex pipiens s.l. (Diptera: Culicidae): molecular differentiation and morphometric analysis
(2024)Geometric morphometrics was used to determine whether geographic isolation could explain differences in wing size and shape between and within continental (27°S to 41°S) and insular (Rapa Nui) populations of Culex pipiens ...
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Unraveling the morphological variation of Triatoma infestans in the peridomestic hHabitats of Chuquisaca Bolivia: A geometric morphometric approach
(2021)Morphometrics has been used on Triatomines, a well-known phenotypically variable insect, to understand the process of morphological plasticity and infer the changes of this phenomenon. The following research was carried ...
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Unraveling the sexual dimorphism of first instar nymphs of the giant stick insect, Cladomorphus phyllinus Gray, 1835, from the Atlantic Forest, Brazil
(2023)The first instar nymphs, both male and female, of the giant stick insect Cladomorphus phyllinus Gray, 1835 were carefully described and measured, revealing a remarkable sexual dimorphism that is considered rare among insects ...
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Unsupervised learning for ripeness estimation from grape seeds images
(2017)Estimating the current stage of grape ripeness is a crucial step in wine making and becomes especially important during harvesting. Visual inspection of grape seeds is one method to achieve this goal without performing ...
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Unveiling novel urease inhibitors for Helicobacter pylori: A multi-methodological approach from virtual screening and ADME to molecular dynamics simulations
(2024)Helicobacter pylori (Hp) infections pose a global health challenge demanding innovative therapeutic strategies by which to eradicate them. Urease, a key Hp virulence factor hydrolyzes urea, facilitating bacterial survival ...
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Urgent conservation needs in the Sikkim Himalaya biodiversity hotspot
(2019)Sikkim is the second smallest state in India. It has a human population of approximately 619,000 and covers a mountain-locked area of 7,096 km2. Recognised as a biodiversity ‘Hot Spot’ of global significance, it is situated ...