Search results for "Peru"
showing 10 items of 1005 documents
Morphogenesis in leaf and single-cell cultures of mature Juniperus oxycedrus
1996
Single cells were mechanically isolated from leaf-derived callus of mature Juniperus oxycedrus L. These cells divided and gave rise to callus when plated on medium containing growth regulators. Best plating efficiency was obtained on a modified Schenk and Hildebrandt medium supplemented with 0.6 micro M 2,4-dichlorophenoxyacetic acid and 100 mg l(-1) casein hydrolyzate. Although single-cell-derived callus showed poor morphogenic potential, both adventitious shoots and embryogenic tissues differentiated from the callus. We also achieved induction of somatic embryogenesis in leaf explants of mature J. oxycedrus trees cultured in the presence of 6.0 or 10.0 micro M 2,4-dichlorophenoxyacetic ac…
Ongelmanratkaisun opettaminen todennäköisyystehtävissä
2017
Mitä enemmän oppilas tai opiskelija oivaltaa itse, sitä enemmän hän oppii ja nauttii ongelmanratkaisusta. Tämä ajatus toimii lähtökohtana tutkielmassa. Käsiteltävät tehtävät ovat tasoltaan yläkouluun ja / tai lukioon soveltuvia. Tutkielma antaa opettajalle käytännönläheisiä esimerkkejä opetustilanteessa hyödynnettävistä todennäköisyysongelmista. Tehtävistä esitetään useita ratkaisuvaihtoehtoja, jotta opettajan on helpompi samaistua erilaisiin ajattelutapoihin. Mikä tärkeintä, tutkielmaan on kehitetty kysymyksiä, joilla oppijaa voi ohjata hienovaraisesti eteenpäin ratkaisussaan. Tavoitteena on, että ratkoja keksii kysymysten avulla itse ratkaisun kuhunkin ongelmaan. Ongelmanratkaisutaitojen …
Le Porte d'Architettura Rustica di Orazio Perucci
2013
The collection Porte d’architettura rustica was published posthumously in 1634, perhaps in Bologna, but it was conceived presumably in the early XVII century. It is a work known to historians, but not yet properly studied, nor is studied its author, Orazio Perucci from Reggio (1549-1624), a painter versed in architecture, but whose design activity is not testified by any evidence or documented works. Conceived as a series of portals designed for civil architecture (palaces and gardens) and as a casuistry of “extravagant” models, the collection follows the example of the fortunate book Libro Extraordinario, although without the same success and editorial circulation. Many refined inventions …
Thermal and non-thermal preservation techniques of tiger nuts' beverage "horchata de chufa". Implications for food safety, nutritional and quality pr…
2017
"Horchata de chufa" is a traditional Spanish beverage produced from tiger nuts (Cyperus esculentus L.). Due to its richness in nutritional compounds, it is highly perishable and its conservation by pasteurization and/or adding preservatives is required. Although efficient, conventional thermal treatment for pasteurization induces changes in the nutritional and sensory properties. Replacing conventional pasteurization by non-thermal technologies such as pulsed electric fields, ultraviolet, and high pressure, combined with moderate temperatures (<40°C) allows a reduction of energy consumption, along with the preservation of the most thermo-sensitive molecules. Accordingly, this review deals w…
Computational thinking in programming with Scratch in primary schools: A systematic review
2020
Computer programming is being introduced in educational curricula, even at the primary school level. One goal of this implementation is to teach computational thinking (CT), which is potentially applicable in various computational problem-solving situations. However, the educational objective of CT in primary schools is somewhat unclear: curricula in various countries define learning objectives for topics, such as computer science, computing, programming or digital literacy but not for CT specifically. Additionally, there has been confusion in concretely and comprehensively defining and operationalising what to teach, learn and assess about CT in primary education even with popular programm…
Facebook’s Emotional Contagion Experiment as a Challenge to Research Ethics
2016
This article analyzes the ethical discussion focusing on the Facebook emotional contagion experiment published by the <em>Proceedings of the National Academy of Sciences</em> in 2014. The massive-scale experiment manipulated the News Feeds of a large amount of Facebook users and was successful in proving that emotional contagion happens also in online environments. However, the experiment caused ethical concerns within and outside academia mainly for two intertwined reasons, the first revolving around the idea of research as manipulation, and the second focusing on the problematic definition of informed consent. The article concurs with recent research that the era of social med…
Teacher competencies in game-based pedagogy
2018
This study examines what kind of competencies teachers need in using game-based pedagogy (GBP). In our conceptual framework, GBP entails four approaches: using educational games or entertainment games, learning by making games, and using gamification in learning. Our data, consisting of teachers’ documentation, thematic interviews and questionnaires, were analysed using qualitative content analysis. Four main competence areas were identified: pedagogical, technological, collaborative and creative. The results are applicable for developing teacher education and in-service training, as teacher competencies in game-based learning will be more integral to teachers’ professional knowledge and sk…
Disciplinary contextualisation of transversal competence in Finnish local curricula : the case of multiliteracy, mathematics, and social studies
2020
Competence-based education is a widely implemented educational approach, but more research is needed into the relationship between transversal competences and individual disciplines. In this article, we present the results of a study focusing on how the transversal competence of multiliteracy is contextually defined in Finnish local curricula in the disciplines of mathematics and social studies. The article offers new insights into the discussion between content- and competence-based educations by introducing the concept of disciplinary contextualisation. Based on the qualitatively analysed data, four different types of disciplinary contextualisation are presented and further discussed. The…
Parental-caregiver perceptions of child oral health-related quality of life (P-CPQ): Psychometric properties for the peruvian spanish language.
2013
Objectives: The aim of the study was to cross-culturally adapt the Parental-Caregiver Perceptions Questionnaire (P-CPQ) to the Peruvian Spanish language and assess its reliability and validity. Study Design: To translate and cross-cultural adapt the instrument, 60 parents answered the P-CPQ in two pilot tests. The final version of the P-CPQ was evaluated in 200 parents of children aged 11 to 14 years, who were clini - cally examined for dental caries. The internal consistency was assessed by Cronbach's alpha coefficient while repeat administration of the P-CPQ on the same 200 children facilitated the test-retest reliability via intraclass correlation coefficient (ICC). Construct and discrim…
Electrochemical characterization of mangrove sediments: A proposal of new proxies for organic matter oxidation
2019
Abstract The voltammetric response of microparticulate deposits resulting from solvent evaporation of ethanolic extracts of mangrove sediments in contact with aqueous acetate buffer is hereby described. Dated sediment cores sampled from the Peruvian mangrove system (“Manglares de Tumbes” National Sanctuary) presented voltammetric responses dominated by oxidative signals of organic components that exhibit significant variations depending on the depth. Voltammetric data allowed for the definition of electrochemical indexes representative of the electrochemically oxidable organic matter fraction. These electrochemical indexes were fEAOM (for the total amount of organic matter being electrochem…