Nativos digitales, inmigrantes digitales: rompiendo mitos. Un estudio sobre el dominio de las TIC en profesorado y estudiantado de la Universidad de Lleida

INTRODUCTION. At university there is a certain trend to consider that students are better for the use of ICT than lecturers, justifying this idea on the difference of age and the fact that they have been born in a digital period. It"s long time since lecturers has the opportunity of carrying out formative processes of tools and technological programs, accepting that the digital education constitutes a key in the processes of teaching and learning. The study that we presented was developed at the University of Lleida the courses 2007-2008, 2008-2009 and 2009-2010. METHOD. The main goal was to comprise information and to analyse the domination using different typology of tools and computer programs on the part of lecturers and students. Data were comprised, through a questionnaire, to lecturers and students of face-to-face, blended or e-learning subjects. RESULTS. The results were analysed descriptively but a cluster study was also carried out with the aim of obtaining profiles concerning to the domination of the TIC tools. DISCUSSION. The study proved that lecturers as well as students had a good level of knowledge of the ICT, confirming recent results of works that indicate being digital native is not an impediment to know and to dominate ICT tools

The flipped classroom model at the university: analysis based on professors’ and students’ assessment in the educational field

We find ourselves in the era of a new paradigm of education, in which learning ceases to be an internal and individual activity and becomes an activity performed collectively, critically, in participation with others, and online (Siemens, 2005). It is in this sense that the flipped classroom model arises. The present study provides evidence of the model’s efficacy at the university. The study investigates whether the model improves: the teaching and learning processes, the satisfaction in the development of the course, the academic performance of students and the assessment of professors. The method used consisted of an evaluative study and the collection of data from both professors and students. Regarding students, we analysed the following set of data: academic results, the university’s official survey, a questionnaire created and validated for the purpose of this study, and a focus group. Regarding professors, we collected data by interviewing the professors that organized the course. The results were in line with the previous study carried out by Yarbro, Arfstrom, McKnight and McKnight (2014). The study by Yarbro and colleagues, as well as present study, confirmed that the model contributed to: the enrichment of teaching and learning processes, aspects related to the integration of concepts, the role change of professors and students, the improvement of the processes of participation and communication, the integration of the ICTs, the improvement of academic results, and the promotion of student interest in the course

Genetic and phenotypic diversity characterization of natural populations of the parasitoid Parvilucifera sinerae

Parasites exert important top-down control of their host populations. The host−parasite system formed by Alexandrium minutum (Dinophyceae) and Parvilucifera sinerae (Perkinsozoa) offers an opportunity to advance our knowledge of parasitism in planktonic communities. In this study, DNA extracted from 73 clonal strains of P. sinerae, from 10 different locations along the Atlantic and Mediterranean coasts, was used to genetically characterize this parasitoid at the species level. All strains showed identical sequences of the small and large subunits and internal transcribed spacer of the ribosomal RNA, as well as of the β-tubulin genes. However, the phenotypical characterization showed variability in terms of host invasion, zoospore success, maturation time, half-maximal infection, and infection rate. This characterization grouped the strains within 3 phenotypic types distinguished by virulence traits. A particular virulence pattern could not be ascribed to host-cell bloom appearance or to the location or year of parasite-strain isolation; rather, some parasitoid strains from the same bloom significantly differed in their virulence traits. Identical markers such as ITS and β-tubulin genes of P. sinerae strains from different geographic areas and from different years precludes their use in assessing intra-specific diversity and could indicate a recent dispersion of this species.Versión del editor2,393

First record of the spatial organization of the nucleosome-less chromatin of dinoflagellates: The nonrandom distribution of microsatellites and bipolar arrangement of telomeres in the nucleus of Gambierdiscus australes (Dinophyceae)

Dinoflagellates are a group of protists whose exceptionally large genome is organized in permanently condensed nucleosome-less chromosomes. In this study, we examined the potential role of repetitive DNAs in both the structure of dinoflagellate chromosomes and the architecture of the dinoflagellate nucleus. Non-denaturing fluorescent in situ hybridization (ND-FSH) was used to determine the abundance and physical distribution of telomeric DNA and 16 microsatellites (1- to 4-bp repeats) in the nucleus of Gambierdiscus australes. The results showed an increased relative abundance of the different microsatellite motifs with increasing GC content. Two ND-FISH probes, (A)20 and (AAT)5, did not yield signals whereas the remainder revealed a dispersed but nonrandom distribution of the microsatellites, mostly in clusters. The bean-shaped interphase nucleus of G. australes contained a region with a high density of trinucleotides. This nuclear compartment was located between the nucleolar organizer region (NOR), located on the concave side of the nucleus, and the convex side. Telomeric DNA was grouped in multiple foci and distributed in two polarized compartments: one associated with the NOR and the other peripherally located along the convex side of the nucleus. Changes in the position of the telomeres during cell division evidenced their dynamic distribution and thus that of the chromosomes during dinomitosis. These insights into the spatial organization of microsatellites and telomeres and thus into the nuclear architecture of G. australes will open up new lines of research into the structure and function of the nucleosome-less chromatin of dinoflagellates.En prensa2,23

University Professor Training in Times of COVID-19: Analysis of Training Programs and Perception of Impact on Teaching Practices

During the confinement and post-confinement period, the continuous training centers at different Catalan universities adapted the lifelong learning of professors. The present study analyzes the education of lecturers from Catalan universities before and after the pandemic, as well as their perception of its impact. A documentary analysis was performed of the continuous training programs for professors. Posteriorly, an enquiry was made about the perception of impact of this training, through a descriptive and inferential analysis with the use of a questionnaire designed ad hoc. Results indicated an increase in training associated with institutional digital tools, online evaluation, and design of online courses. The efforts by the professors to implement the knowledge acquired is underlined, with a higher perception of impact observed in the areas of Social and Legal Sciences and Arts and Humanities. In addition, the main difficulties perceived were the lack of time for adapting their practice of teaching with the knowledge acquired, as well as the complexity of performing an online evaluation. It is concluded that there is a need for continuous training programs that help establish support networks and collaboration between professors for the improvement of teaching, and in which one of the priorities is online evaluation.This study has been co-financed under the RETSASO EFA 341/19 Project with FEDER funds. It has also been subsidized by the DOTS University Chair (Chair for the Development of Healthy and Sustainable Organizations and Territories), approved by agreement no. 193/2017 of the Governing Council of the University of Lleida on 19 July 2017

The intricacies of dinoflagellate pellicle cysts: The example of Alexandrium minutum cysts from a bloom-recurrent area (Bay of Baiona,NW Spain)

The terms “temporary”, “pellicle,” and “ecdysal” cysts have been employed arbitrarily in the literature of the dinoflagellate life cycle to describe a non-motile and single-layered-wall stage with no mandatory dormancy period, of asexual or sexual origin. These three terms have been used more or less synonymously, but more specific definitions, taking into account morphological and physiological aspects and their roles in dinoflagellate population dynamics, are still needed. To clarify the current terminology, we examine and discuss the usages and foundations of those terms. The background for this discussion is provided by a comparison of the morphology and germination times of three different types of Alexandrium minutum cysts collected during a seasonal bloom in the Bay of Baiona (NW Spain). The double-walled cysts were similar to the resting cysts reported for this species, but other, thin-walled and thecate cysts were also observed. These latter cysts needed between 1 and 17 days to germinate and were therefore considered as short-term cysts, in contrast to the 1.5-month dormancy period of resting (hypnozygotic) cysts. Our results showed that the temporal distribution of these short-term cysts during the bloom period followed a pattern very similar to that of vegetative cells. However, resting cysts were only detected at the end of the bloom. In the context of our present knowledge regarding the dormancy and quiescence of dinoflagellate cysts, “temporary” is a very misleading and uncertain term and must be rejected. The term “ecdysal” has been used in reference to thin-walled cysts when ecdysis has been proved; however, ecdysis is not unique to this type of cysts as thick-walled zygotic cysts can be formed thorough ecdysis of a thecate planozygote. In conclusion, based on our current understanding of cysts, the term “pellicle” more appropriately describes single-layered-wall stages.Versión del editor2,277

Ultrastructure and Glycoconjugate Pattern ofthe Foot Epithelium of the Abalone Haliotis tuberculata (Linnaeus, 1758) (Gastropoda, Haliotidae)

The foot epithelium of the gastropod Haliotis tuberculata is studied by light and electron microscopy in order to contribute to the understanding of the anatomy and functional morphology of the mollusks integument. Study of the external surface by scanning electron microscopy reveals that the side foot epithelium is characterized by a microvillus border with a very scant presence of small ciliary tufts, but the sole foot epithelium bears a dense field of long cilia. Ultrastructural examination by transmission electron microscopy of the side epithelial cells shows deeply pigmented cells with high electron-dense granular content which are not observed in the epithelial sole cells. Along the pedal epithelium, seven types of secretory cells are present; furthermore, two types of subepithelial glands are located just in the sole foot. The presence and composition of glycoconjugates in the secretory cells and subepithelial glands are analyzed by conventional and lectin histochemistry. Subepithelial glands contain mainly N-glycoproteins rich in fucose and mannose whereas secretory cells present mostly acidic sulphated glycoconjugates such as glycosaminoglycans and mucins, which are rich in galactose, N-acetyl-galactosamine, and N-acetyl-glucosamine. No sialic acid is present in the foot epithelium.Versión del edito